Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 6809 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
new file mode 100644
index 000000000..7aac9fc71
--- /dev/null
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -0,0 +1,6809 @@
+/*******************************************************************
+ * This file is part of the Emulex Linux Device Driver for         *
+ * Fibre Channel Host Bus Adapters.                                *
+ * Copyright (C) 2017-2022 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/export.h>
+#include <linux/delay.h>
+#include <asm/unaligned.h>
+#include <linux/t10-pi.h>
+#include <linux/crc-t10dif.h>
+#include <linux/blk-cgroup.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 "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_scsi.h"
+#include "lpfc_logmsg.h"
+#include "lpfc_crtn.h"
+#include "lpfc_vport.h"
+
+#define LPFC_RESET_WAIT  2
+#define LPFC_ABORT_WAIT  2
+
+static char *dif_op_str[] = {
+	"PROT_NORMAL",
+	"PROT_READ_INSERT",
+	"PROT_WRITE_STRIP",
+	"PROT_READ_STRIP",
+	"PROT_WRITE_INSERT",
+	"PROT_READ_PASS",
+	"PROT_WRITE_PASS",
+};
+
+struct scsi_dif_tuple {
+	__be16 guard_tag;       /* Checksum */
+	__be16 app_tag;         /* Opaque storage */
+	__be32 ref_tag;         /* Target LBA or indirect LBA */
+};
+
+static struct lpfc_rport_data *
+lpfc_rport_data_from_scsi_device(struct scsi_device *sdev)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *)sdev->host->hostdata;
+
+	if (vport->phba->cfg_fof)
+		return ((struct lpfc_device_data *)sdev->hostdata)->rport_data;
+	else
+		return (struct lpfc_rport_data *)sdev->hostdata;
+}
+
+static void
+lpfc_release_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_io_buf *psb);
+static void
+lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *psb);
+static int
+lpfc_prot_group_type(struct lpfc_hba *phba, struct scsi_cmnd *sc);
+
+/**
+ * lpfc_sli4_set_rsp_sgl_last - Set the last bit in the response sge.
+ * @phba: Pointer to HBA object.
+ * @lpfc_cmd: lpfc scsi command object pointer.
+ *
+ * This function is called from the lpfc_prep_task_mgmt_cmd function to
+ * set the last bit in the response sge entry.
+ **/
+static void
+lpfc_sli4_set_rsp_sgl_last(struct lpfc_hba *phba,
+				struct lpfc_io_buf *lpfc_cmd)
+{
+	struct sli4_sge *sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
+	if (sgl) {
+		sgl += 1;
+		sgl->word2 = le32_to_cpu(sgl->word2);
+		bf_set(lpfc_sli4_sge_last, sgl, 1);
+		sgl->word2 = cpu_to_le32(sgl->word2);
+	}
+}
+
+/**
+ * lpfc_rampdown_queue_depth - Post RAMP_DOWN_QUEUE event to worker thread
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine is called when there is resource error in driver or firmware.
+ * This routine posts WORKER_RAMP_DOWN_QUEUE event for @phba. This routine
+ * posts at most 1 event each second. This routine wakes up worker thread of
+ * @phba to process WORKER_RAM_DOWN_EVENT event.
+ *
+ * This routine should be called with no lock held.
+ **/
+void
+lpfc_rampdown_queue_depth(struct lpfc_hba *phba)
+{
+	unsigned long flags;
+	uint32_t evt_posted;
+	unsigned long expires;
+
+	spin_lock_irqsave(&phba->hbalock, flags);
+	atomic_inc(&phba->num_rsrc_err);
+	phba->last_rsrc_error_time = jiffies;
+
+	expires = phba->last_ramp_down_time + QUEUE_RAMP_DOWN_INTERVAL;
+	if (time_after(expires, jiffies)) {
+		spin_unlock_irqrestore(&phba->hbalock, flags);
+		return;
+	}
+
+	phba->last_ramp_down_time = jiffies;
+
+	spin_unlock_irqrestore(&phba->hbalock, flags);
+
+	spin_lock_irqsave(&phba->pport->work_port_lock, flags);
+	evt_posted = phba->pport->work_port_events & WORKER_RAMP_DOWN_QUEUE;
+	if (!evt_posted)
+		phba->pport->work_port_events |= WORKER_RAMP_DOWN_QUEUE;
+	spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
+
+	if (!evt_posted)
+		lpfc_worker_wake_up(phba);
+	return;
+}
+
+/**
+ * lpfc_ramp_down_queue_handler - WORKER_RAMP_DOWN_QUEUE event handler
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine is called to  process WORKER_RAMP_DOWN_QUEUE event for worker
+ * thread.This routine reduces queue depth for all scsi device on each vport
+ * associated with @phba.
+ **/
+void
+lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
+{
+	struct lpfc_vport **vports;
+	struct Scsi_Host  *shost;
+	struct scsi_device *sdev;
+	unsigned long new_queue_depth;
+	unsigned long num_rsrc_err, num_cmd_success;
+	int i;
+
+	num_rsrc_err = atomic_read(&phba->num_rsrc_err);
+	num_cmd_success = atomic_read(&phba->num_cmd_success);
+
+	/*
+	 * The error and success command counters are global per
+	 * driver instance.  If another handler has already
+	 * operated on this error event, just exit.
+	 */
+	if (num_rsrc_err == 0)
+		return;
+
+	vports = lpfc_create_vport_work_array(phba);
+	if (vports != NULL)
+		for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
+			shost = lpfc_shost_from_vport(vports[i]);
+			shost_for_each_device(sdev, shost) {
+				new_queue_depth =
+					sdev->queue_depth * num_rsrc_err /
+					(num_rsrc_err + num_cmd_success);
+				if (!new_queue_depth)
+					new_queue_depth = sdev->queue_depth - 1;
+				else
+					new_queue_depth = sdev->queue_depth -
+								new_queue_depth;
+				scsi_change_queue_depth(sdev, new_queue_depth);
+			}
+		}
+	lpfc_destroy_vport_work_array(phba, vports);
+	atomic_set(&phba->num_rsrc_err, 0);
+	atomic_set(&phba->num_cmd_success, 0);
+}
+
+/**
+ * lpfc_scsi_dev_block - set all scsi hosts to block state
+ * @phba: Pointer to HBA context object.
+ *
+ * This function walks vport list and set each SCSI host to block state
+ * by invoking fc_remote_port_delete() routine. This function is invoked
+ * with EEH when device's PCI slot has been permanently disabled.
+ **/
+void
+lpfc_scsi_dev_block(struct lpfc_hba *phba)
+{
+	struct lpfc_vport **vports;
+	struct Scsi_Host  *shost;
+	struct scsi_device *sdev;
+	struct fc_rport *rport;
+	int i;
+
+	vports = lpfc_create_vport_work_array(phba);
+	if (vports != NULL)
+		for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
+			shost = lpfc_shost_from_vport(vports[i]);
+			shost_for_each_device(sdev, shost) {
+				rport = starget_to_rport(scsi_target(sdev));
+				fc_remote_port_delete(rport);
+			}
+		}
+	lpfc_destroy_vport_work_array(phba, vports);
+}
+
+/**
+ * lpfc_new_scsi_buf_s3 - Scsi buffer allocator for HBA with SLI3 IF spec
+ * @vport: The virtual port for which this call being executed.
+ * @num_to_alloc: The requested number of buffers to allocate.
+ *
+ * This routine allocates a scsi buffer for device with SLI-3 interface spec,
+ * the scsi buffer contains all the necessary information needed to initiate
+ * a SCSI I/O. The non-DMAable buffer region contains information to build
+ * the IOCB. The DMAable region contains memory for the FCP CMND, FCP RSP,
+ * and the initial BPL. In addition to allocating memory, the FCP CMND and
+ * FCP RSP BDEs are setup in the BPL and the BPL BDE is setup in the IOCB.
+ *
+ * Return codes:
+ *   int - number of scsi buffers that were allocated.
+ *   0 = failure, less than num_to_alloc is a partial failure.
+ **/
+static int
+lpfc_new_scsi_buf_s3(struct lpfc_vport *vport, int num_to_alloc)
+{
+	struct lpfc_hba *phba = vport->phba;
+	struct lpfc_io_buf *psb;
+	struct ulp_bde64 *bpl;
+	IOCB_t *iocb;
+	dma_addr_t pdma_phys_fcp_cmd;
+	dma_addr_t pdma_phys_fcp_rsp;
+	dma_addr_t pdma_phys_sgl;
+	uint16_t iotag;
+	int bcnt, bpl_size;
+
+	bpl_size = phba->cfg_sg_dma_buf_size -
+		(sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
+
+	lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+			 "9067 ALLOC %d scsi_bufs: %d (%d + %d + %d)\n",
+			 num_to_alloc, phba->cfg_sg_dma_buf_size,
+			 (int)sizeof(struct fcp_cmnd),
+			 (int)sizeof(struct fcp_rsp), bpl_size);
+
+	for (bcnt = 0; bcnt < num_to_alloc; bcnt++) {
+		psb = kzalloc(sizeof(struct lpfc_io_buf), GFP_KERNEL);
+		if (!psb)
+			break;
+
+		/*
+		 * Get memory from the pci pool to map the virt space to pci
+		 * bus space for an I/O.  The DMA buffer includes space for the
+		 * struct fcp_cmnd, struct fcp_rsp and the number of bde's
+		 * necessary to support the sg_tablesize.
+		 */
+		psb->data = dma_pool_zalloc(phba->lpfc_sg_dma_buf_pool,
+					GFP_KERNEL, &psb->dma_handle);
+		if (!psb->data) {
+			kfree(psb);
+			break;
+		}
+
+
+		/* Allocate iotag for psb->cur_iocbq. */
+		iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
+		if (iotag == 0) {
+			dma_pool_free(phba->lpfc_sg_dma_buf_pool,
+				      psb->data, psb->dma_handle);
+			kfree(psb);
+			break;
+		}
+		psb->cur_iocbq.cmd_flag |= LPFC_IO_FCP;
+
+		psb->fcp_cmnd = psb->data;
+		psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
+		psb->dma_sgl = psb->data + sizeof(struct fcp_cmnd) +
+			sizeof(struct fcp_rsp);
+
+		/* Initialize local short-hand pointers. */
+		bpl = (struct ulp_bde64 *)psb->dma_sgl;
+		pdma_phys_fcp_cmd = psb->dma_handle;
+		pdma_phys_fcp_rsp = psb->dma_handle + sizeof(struct fcp_cmnd);
+		pdma_phys_sgl = psb->dma_handle + sizeof(struct fcp_cmnd) +
+			sizeof(struct fcp_rsp);
+
+		/*
+		 * The first two bdes are the FCP_CMD and FCP_RSP. The balance
+		 * are sg list bdes.  Initialize the first two and leave the
+		 * rest for queuecommand.
+		 */
+		bpl[0].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_cmd));
+		bpl[0].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_cmd));
+		bpl[0].tus.f.bdeSize = sizeof(struct fcp_cmnd);
+		bpl[0].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+		bpl[0].tus.w = le32_to_cpu(bpl[0].tus.w);
+
+		/* Setup the physical region for the FCP RSP */
+		bpl[1].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_rsp));
+		bpl[1].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_rsp));
+		bpl[1].tus.f.bdeSize = sizeof(struct fcp_rsp);
+		bpl[1].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+		bpl[1].tus.w = le32_to_cpu(bpl[1].tus.w);
+
+		/*
+		 * Since the IOCB for the FCP I/O is built into this
+		 * lpfc_scsi_buf, initialize it with all known data now.
+		 */
+		iocb = &psb->cur_iocbq.iocb;
+		iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
+		if ((phba->sli_rev == 3) &&
+				!(phba->sli3_options & LPFC_SLI3_BG_ENABLED)) {
+			/* fill in immediate fcp command BDE */
+			iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDE_IMMED;
+			iocb->un.fcpi64.bdl.bdeSize = sizeof(struct fcp_cmnd);
+			iocb->un.fcpi64.bdl.addrLow = offsetof(IOCB_t,
+					unsli3.fcp_ext.icd);
+			iocb->un.fcpi64.bdl.addrHigh = 0;
+			iocb->ulpBdeCount = 0;
+			iocb->ulpLe = 0;
+			/* fill in response BDE */
+			iocb->unsli3.fcp_ext.rbde.tus.f.bdeFlags =
+							BUFF_TYPE_BDE_64;
+			iocb->unsli3.fcp_ext.rbde.tus.f.bdeSize =
+				sizeof(struct fcp_rsp);
+			iocb->unsli3.fcp_ext.rbde.addrLow =
+				putPaddrLow(pdma_phys_fcp_rsp);
+			iocb->unsli3.fcp_ext.rbde.addrHigh =
+				putPaddrHigh(pdma_phys_fcp_rsp);
+		} else {
+			iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
+			iocb->un.fcpi64.bdl.bdeSize =
+					(2 * sizeof(struct ulp_bde64));
+			iocb->un.fcpi64.bdl.addrLow =
+					putPaddrLow(pdma_phys_sgl);
+			iocb->un.fcpi64.bdl.addrHigh =
+					putPaddrHigh(pdma_phys_sgl);
+			iocb->ulpBdeCount = 1;
+			iocb->ulpLe = 1;
+		}
+		iocb->ulpClass = CLASS3;
+		psb->status = IOSTAT_SUCCESS;
+		/* Put it back into the SCSI buffer list */
+		psb->cur_iocbq.io_buf = psb;
+		spin_lock_init(&psb->buf_lock);
+		lpfc_release_scsi_buf_s3(phba, psb);
+
+	}
+
+	return bcnt;
+}
+
+/**
+ * lpfc_sli4_vport_delete_fcp_xri_aborted -Remove all ndlp references for vport
+ * @vport: pointer to lpfc vport data structure.
+ *
+ * This routine is invoked by the vport cleanup for deletions and the cleanup
+ * for an ndlp on removal.
+ **/
+void
+lpfc_sli4_vport_delete_fcp_xri_aborted(struct lpfc_vport *vport)
+{
+	struct lpfc_hba *phba = vport->phba;
+	struct lpfc_io_buf *psb, *next_psb;
+	struct lpfc_sli4_hdw_queue *qp;
+	unsigned long iflag = 0;
+	int idx;
+
+	if (!(vport->cfg_enable_fc4_type & LPFC_ENABLE_FCP))
+		return;
+
+	spin_lock_irqsave(&phba->hbalock, iflag);
+	for (idx = 0; idx < phba->cfg_hdw_queue; idx++) {
+		qp = &phba->sli4_hba.hdwq[idx];
+
+		spin_lock(&qp->abts_io_buf_list_lock);
+		list_for_each_entry_safe(psb, next_psb,
+					 &qp->lpfc_abts_io_buf_list, list) {
+			if (psb->cur_iocbq.cmd_flag & LPFC_IO_NVME)
+				continue;
+
+			if (psb->rdata && psb->rdata->pnode &&
+			    psb->rdata->pnode->vport == vport)
+				psb->rdata = NULL;
+		}
+		spin_unlock(&qp->abts_io_buf_list_lock);
+	}
+	spin_unlock_irqrestore(&phba->hbalock, iflag);
+}
+
+/**
+ * lpfc_sli4_io_xri_aborted - Fast-path process of fcp xri abort
+ * @phba: pointer to lpfc hba data structure.
+ * @axri: pointer to the fcp xri abort wcqe structure.
+ * @idx: index into hdwq
+ *
+ * This routine is invoked by the worker thread to process a SLI4 fast-path
+ * FCP or NVME aborted xri.
+ **/
+void
+lpfc_sli4_io_xri_aborted(struct lpfc_hba *phba,
+			 struct sli4_wcqe_xri_aborted *axri, int idx)
+{
+	u16 xri = 0;
+	u16 rxid = 0;
+	struct lpfc_io_buf *psb, *next_psb;
+	struct lpfc_sli4_hdw_queue *qp;
+	unsigned long iflag = 0;
+	struct lpfc_iocbq *iocbq;
+	int i;
+	struct lpfc_nodelist *ndlp;
+	int rrq_empty = 0;
+	struct lpfc_sli_ring *pring = phba->sli4_hba.els_wq->pring;
+	struct scsi_cmnd *cmd;
+	int offline = 0;
+
+	if (!(phba->cfg_enable_fc4_type & LPFC_ENABLE_FCP))
+		return;
+	offline = pci_channel_offline(phba->pcidev);
+	if (!offline) {
+		xri = bf_get(lpfc_wcqe_xa_xri, axri);
+		rxid = bf_get(lpfc_wcqe_xa_remote_xid, axri);
+	}
+	qp = &phba->sli4_hba.hdwq[idx];
+	spin_lock_irqsave(&phba->hbalock, iflag);
+	spin_lock(&qp->abts_io_buf_list_lock);
+	list_for_each_entry_safe(psb, next_psb,
+		&qp->lpfc_abts_io_buf_list, list) {
+		if (offline)
+			xri = psb->cur_iocbq.sli4_xritag;
+		if (psb->cur_iocbq.sli4_xritag == xri) {
+			list_del_init(&psb->list);
+			psb->flags &= ~LPFC_SBUF_XBUSY;
+			psb->status = IOSTAT_SUCCESS;
+			if (psb->cur_iocbq.cmd_flag & LPFC_IO_NVME) {
+				qp->abts_nvme_io_bufs--;
+				spin_unlock(&qp->abts_io_buf_list_lock);
+				spin_unlock_irqrestore(&phba->hbalock, iflag);
+				if (!offline) {
+					lpfc_sli4_nvme_xri_aborted(phba, axri,
+								   psb);
+					return;
+				}
+				lpfc_sli4_nvme_pci_offline_aborted(phba, psb);
+				spin_lock_irqsave(&phba->hbalock, iflag);
+				spin_lock(&qp->abts_io_buf_list_lock);
+				continue;
+			}
+			qp->abts_scsi_io_bufs--;
+			spin_unlock(&qp->abts_io_buf_list_lock);
+
+			if (psb->rdata && psb->rdata->pnode)
+				ndlp = psb->rdata->pnode;
+			else
+				ndlp = NULL;
+
+			rrq_empty = list_empty(&phba->active_rrq_list);
+			spin_unlock_irqrestore(&phba->hbalock, iflag);
+			if (ndlp && !offline) {
+				lpfc_set_rrq_active(phba, ndlp,
+					psb->cur_iocbq.sli4_lxritag, rxid, 1);
+				lpfc_sli4_abts_err_handler(phba, ndlp, axri);
+			}
+
+			if (phba->cfg_fcp_wait_abts_rsp || offline) {
+				spin_lock_irqsave(&psb->buf_lock, iflag);
+				cmd = psb->pCmd;
+				psb->pCmd = NULL;
+				spin_unlock_irqrestore(&psb->buf_lock, iflag);
+
+				/* The sdev is not guaranteed to be valid post
+				 * scsi_done upcall.
+				 */
+				if (cmd)
+					scsi_done(cmd);
+
+				/*
+				 * We expect there is an abort thread waiting
+				 * for command completion wake up the thread.
+				 */
+				spin_lock_irqsave(&psb->buf_lock, iflag);
+				psb->cur_iocbq.cmd_flag &=
+					~LPFC_DRIVER_ABORTED;
+				if (psb->waitq)
+					wake_up(psb->waitq);
+				spin_unlock_irqrestore(&psb->buf_lock, iflag);
+			}
+
+			lpfc_release_scsi_buf_s4(phba, psb);
+			if (rrq_empty)
+				lpfc_worker_wake_up(phba);
+			if (!offline)
+				return;
+			spin_lock_irqsave(&phba->hbalock, iflag);
+			spin_lock(&qp->abts_io_buf_list_lock);
+			continue;
+		}
+	}
+	spin_unlock(&qp->abts_io_buf_list_lock);
+	if (!offline) {
+		for (i = 1; i <= phba->sli.last_iotag; i++) {
+			iocbq = phba->sli.iocbq_lookup[i];
+
+			if (!(iocbq->cmd_flag & LPFC_IO_FCP) ||
+			    (iocbq->cmd_flag & LPFC_IO_LIBDFC))
+				continue;
+			if (iocbq->sli4_xritag != xri)
+				continue;
+			psb = container_of(iocbq, struct lpfc_io_buf, cur_iocbq);
+			psb->flags &= ~LPFC_SBUF_XBUSY;
+			spin_unlock_irqrestore(&phba->hbalock, iflag);
+			if (!list_empty(&pring->txq))
+				lpfc_worker_wake_up(phba);
+			return;
+		}
+	}
+	spin_unlock_irqrestore(&phba->hbalock, iflag);
+}
+
+/**
+ * lpfc_get_scsi_buf_s3 - Get a scsi buffer from lpfc_scsi_buf_list of the HBA
+ * @phba: The HBA for which this call is being executed.
+ * @ndlp: pointer to a node-list data structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
+ * and returns to caller.
+ *
+ * Return codes:
+ *   NULL - Error
+ *   Pointer to lpfc_scsi_buf - Success
+ **/
+static struct lpfc_io_buf *
+lpfc_get_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
+		     struct scsi_cmnd *cmnd)
+{
+	struct lpfc_io_buf *lpfc_cmd = NULL;
+	struct list_head *scsi_buf_list_get = &phba->lpfc_scsi_buf_list_get;
+	unsigned long iflag = 0;
+
+	spin_lock_irqsave(&phba->scsi_buf_list_get_lock, iflag);
+	list_remove_head(scsi_buf_list_get, lpfc_cmd, struct lpfc_io_buf,
+			 list);
+	if (!lpfc_cmd) {
+		spin_lock(&phba->scsi_buf_list_put_lock);
+		list_splice(&phba->lpfc_scsi_buf_list_put,
+			    &phba->lpfc_scsi_buf_list_get);
+		INIT_LIST_HEAD(&phba->lpfc_scsi_buf_list_put);
+		list_remove_head(scsi_buf_list_get, lpfc_cmd,
+				 struct lpfc_io_buf, list);
+		spin_unlock(&phba->scsi_buf_list_put_lock);
+	}
+	spin_unlock_irqrestore(&phba->scsi_buf_list_get_lock, iflag);
+
+	if (lpfc_ndlp_check_qdepth(phba, ndlp) && lpfc_cmd) {
+		atomic_inc(&ndlp->cmd_pending);
+		lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
+	}
+	return  lpfc_cmd;
+}
+/**
+ * lpfc_get_scsi_buf_s4 - Get a scsi buffer from io_buf_list of the HBA
+ * @phba: The HBA for which this call is being executed.
+ * @ndlp: pointer to a node-list data structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine removes a scsi buffer from head of @hdwq io_buf_list
+ * and returns to caller.
+ *
+ * Return codes:
+ *   NULL - Error
+ *   Pointer to lpfc_scsi_buf - Success
+ **/
+static struct lpfc_io_buf *
+lpfc_get_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
+		     struct scsi_cmnd *cmnd)
+{
+	struct lpfc_io_buf *lpfc_cmd;
+	struct lpfc_sli4_hdw_queue *qp;
+	struct sli4_sge *sgl;
+	dma_addr_t pdma_phys_fcp_rsp;
+	dma_addr_t pdma_phys_fcp_cmd;
+	uint32_t cpu, idx;
+	int tag;
+	struct fcp_cmd_rsp_buf *tmp = NULL;
+
+	cpu = raw_smp_processor_id();
+	if (cmnd && phba->cfg_fcp_io_sched == LPFC_FCP_SCHED_BY_HDWQ) {
+		tag = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
+		idx = blk_mq_unique_tag_to_hwq(tag);
+	} else {
+		idx = phba->sli4_hba.cpu_map[cpu].hdwq;
+	}
+
+	lpfc_cmd = lpfc_get_io_buf(phba, ndlp, idx,
+				   !phba->cfg_xri_rebalancing);
+	if (!lpfc_cmd) {
+		qp = &phba->sli4_hba.hdwq[idx];
+		qp->empty_io_bufs++;
+		return NULL;
+	}
+
+	/* Setup key fields in buffer that may have been changed
+	 * if other protocols used this buffer.
+	 */
+	lpfc_cmd->cur_iocbq.cmd_flag = LPFC_IO_FCP;
+	lpfc_cmd->prot_seg_cnt = 0;
+	lpfc_cmd->seg_cnt = 0;
+	lpfc_cmd->timeout = 0;
+	lpfc_cmd->flags = 0;
+	lpfc_cmd->start_time = jiffies;
+	lpfc_cmd->waitq = NULL;
+	lpfc_cmd->cpu = cpu;
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	lpfc_cmd->prot_data_type = 0;
+#endif
+	tmp = lpfc_get_cmd_rsp_buf_per_hdwq(phba, lpfc_cmd);
+	if (!tmp) {
+		lpfc_release_io_buf(phba, lpfc_cmd, lpfc_cmd->hdwq);
+		return NULL;
+	}
+
+	lpfc_cmd->fcp_cmnd = tmp->fcp_cmnd;
+	lpfc_cmd->fcp_rsp = tmp->fcp_rsp;
+
+	/*
+	 * The first two SGEs are the FCP_CMD and FCP_RSP.
+	 * The balance are sg list bdes. Initialize the
+	 * first two and leave the rest for queuecommand.
+	 */
+	sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
+	pdma_phys_fcp_cmd = tmp->fcp_cmd_rsp_dma_handle;
+	sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_cmd));
+	sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_cmd));
+	sgl->word2 = le32_to_cpu(sgl->word2);
+	bf_set(lpfc_sli4_sge_last, sgl, 0);
+	sgl->word2 = cpu_to_le32(sgl->word2);
+	sgl->sge_len = cpu_to_le32(sizeof(struct fcp_cmnd));
+	sgl++;
+
+	/* Setup the physical region for the FCP RSP */
+	pdma_phys_fcp_rsp = pdma_phys_fcp_cmd + sizeof(struct fcp_cmnd);
+	sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_rsp));
+	sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_rsp));
+	sgl->word2 = le32_to_cpu(sgl->word2);
+	bf_set(lpfc_sli4_sge_last, sgl, 1);
+	sgl->word2 = cpu_to_le32(sgl->word2);
+	sgl->sge_len = cpu_to_le32(sizeof(struct fcp_rsp));
+
+	if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
+		atomic_inc(&ndlp->cmd_pending);
+		lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
+	}
+	return  lpfc_cmd;
+}
+/**
+ * lpfc_get_scsi_buf - Get a scsi buffer from lpfc_scsi_buf_list of the HBA
+ * @phba: The HBA for which this call is being executed.
+ * @ndlp: pointer to a node-list data structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
+ * and returns to caller.
+ *
+ * Return codes:
+ *   NULL - Error
+ *   Pointer to lpfc_scsi_buf - Success
+ **/
+static struct lpfc_io_buf*
+lpfc_get_scsi_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
+		  struct scsi_cmnd *cmnd)
+{
+	return  phba->lpfc_get_scsi_buf(phba, ndlp, cmnd);
+}
+
+/**
+ * lpfc_release_scsi_buf_s3 - Return a scsi buffer back to hba scsi buf list
+ * @phba: The Hba for which this call is being executed.
+ * @psb: The scsi buffer which is being released.
+ *
+ * This routine releases @psb scsi buffer by adding it to tail of @phba
+ * lpfc_scsi_buf_list list.
+ **/
+static void
+lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
+{
+	unsigned long iflag = 0;
+
+	psb->seg_cnt = 0;
+	psb->prot_seg_cnt = 0;
+
+	spin_lock_irqsave(&phba->scsi_buf_list_put_lock, iflag);
+	psb->pCmd = NULL;
+	psb->cur_iocbq.cmd_flag = LPFC_IO_FCP;
+	list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list_put);
+	spin_unlock_irqrestore(&phba->scsi_buf_list_put_lock, iflag);
+}
+
+/**
+ * lpfc_release_scsi_buf_s4: Return a scsi buffer back to hba scsi buf list.
+ * @phba: The Hba for which this call is being executed.
+ * @psb: The scsi buffer which is being released.
+ *
+ * This routine releases @psb scsi buffer by adding it to tail of @hdwq
+ * io_buf_list list. For SLI4 XRI's are tied to the scsi buffer
+ * and cannot be reused for at least RA_TOV amount of time if it was
+ * aborted.
+ **/
+static void
+lpfc_release_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
+{
+	struct lpfc_sli4_hdw_queue *qp;
+	unsigned long iflag = 0;
+
+	psb->seg_cnt = 0;
+	psb->prot_seg_cnt = 0;
+
+	qp = psb->hdwq;
+	if (psb->flags & LPFC_SBUF_XBUSY) {
+		spin_lock_irqsave(&qp->abts_io_buf_list_lock, iflag);
+		if (!phba->cfg_fcp_wait_abts_rsp)
+			psb->pCmd = NULL;
+		list_add_tail(&psb->list, &qp->lpfc_abts_io_buf_list);
+		qp->abts_scsi_io_bufs++;
+		spin_unlock_irqrestore(&qp->abts_io_buf_list_lock, iflag);
+	} else {
+		lpfc_release_io_buf(phba, (struct lpfc_io_buf *)psb, qp);
+	}
+}
+
+/**
+ * lpfc_release_scsi_buf: Return a scsi buffer back to hba scsi buf list.
+ * @phba: The Hba for which this call is being executed.
+ * @psb: The scsi buffer which is being released.
+ *
+ * This routine releases @psb scsi buffer by adding it to tail of @phba
+ * lpfc_scsi_buf_list list.
+ **/
+static void
+lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
+{
+	if ((psb->flags & LPFC_SBUF_BUMP_QDEPTH) && psb->ndlp)
+		atomic_dec(&psb->ndlp->cmd_pending);
+
+	psb->flags &= ~LPFC_SBUF_BUMP_QDEPTH;
+	phba->lpfc_release_scsi_buf(phba, psb);
+}
+
+/**
+ * lpfc_fcpcmd_to_iocb - copy the fcp_cmd data into the IOCB
+ * @data: A pointer to the immediate command data portion of the IOCB.
+ * @fcp_cmnd: The FCP Command that is provided by the SCSI layer.
+ *
+ * The routine copies the entire FCP command from @fcp_cmnd to @data while
+ * byte swapping the data to big endian format for transmission on the wire.
+ **/
+static void
+lpfc_fcpcmd_to_iocb(u8 *data, struct fcp_cmnd *fcp_cmnd)
+{
+	int i, j;
+
+	for (i = 0, j = 0; i < sizeof(struct fcp_cmnd);
+	     i += sizeof(uint32_t), j++) {
+		((uint32_t *)data)[j] = cpu_to_be32(((uint32_t *)fcp_cmnd)[j]);
+	}
+}
+
+/**
+ * lpfc_scsi_prep_dma_buf_s3 - DMA mapping for scsi buffer to SLI3 IF spec
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This routine does the pci dma mapping for scatter-gather list of scsi cmnd
+ * field of @lpfc_cmd for device with SLI-3 interface spec. This routine scans
+ * through sg elements and format the bde. This routine also initializes all
+ * IOCB fields which are dependent on scsi command request buffer.
+ *
+ * Return codes:
+ *   1 - Error
+ *   0 - Success
+ **/
+static int
+lpfc_scsi_prep_dma_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct scatterlist *sgel = NULL;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct ulp_bde64 *bpl = (struct ulp_bde64 *)lpfc_cmd->dma_sgl;
+	struct lpfc_iocbq *iocbq = &lpfc_cmd->cur_iocbq;
+	IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
+	struct ulp_bde64 *data_bde = iocb_cmd->unsli3.fcp_ext.dbde;
+	dma_addr_t physaddr;
+	uint32_t num_bde = 0;
+	int nseg, datadir = scsi_cmnd->sc_data_direction;
+
+	/*
+	 * There are three possibilities here - use scatter-gather segment, use
+	 * the single mapping, or neither.  Start the lpfc command prep by
+	 * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
+	 * data bde entry.
+	 */
+	bpl += 2;
+	if (scsi_sg_count(scsi_cmnd)) {
+		/*
+		 * The driver stores the segment count returned from dma_map_sg
+		 * because this a count of dma-mappings used to map the use_sg
+		 * pages.  They are not guaranteed to be the same for those
+		 * architectures that implement an IOMMU.
+		 */
+
+		nseg = dma_map_sg(&phba->pcidev->dev, scsi_sglist(scsi_cmnd),
+				  scsi_sg_count(scsi_cmnd), datadir);
+		if (unlikely(!nseg))
+			return 1;
+
+		lpfc_cmd->seg_cnt = nseg;
+		if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9064 BLKGRD: %s: Too many sg segments"
+					" from dma_map_sg.  Config %d, seg_cnt"
+					" %d\n", __func__, phba->cfg_sg_seg_cnt,
+					lpfc_cmd->seg_cnt);
+			WARN_ON_ONCE(lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt);
+			lpfc_cmd->seg_cnt = 0;
+			scsi_dma_unmap(scsi_cmnd);
+			return 2;
+		}
+
+		/*
+		 * The driver established a maximum scatter-gather segment count
+		 * during probe that limits the number of sg elements in any
+		 * single scsi command.  Just run through the seg_cnt and format
+		 * the bde's.
+		 * When using SLI-3 the driver will try to fit all the BDEs into
+		 * the IOCB. If it can't then the BDEs get added to a BPL as it
+		 * does for SLI-2 mode.
+		 */
+		scsi_for_each_sg(scsi_cmnd, sgel, nseg, num_bde) {
+			physaddr = sg_dma_address(sgel);
+			if (phba->sli_rev == 3 &&
+			    !(phba->sli3_options & LPFC_SLI3_BG_ENABLED) &&
+			    !(iocbq->cmd_flag & DSS_SECURITY_OP) &&
+			    nseg <= LPFC_EXT_DATA_BDE_COUNT) {
+				data_bde->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+				data_bde->tus.f.bdeSize = sg_dma_len(sgel);
+				data_bde->addrLow = putPaddrLow(physaddr);
+				data_bde->addrHigh = putPaddrHigh(physaddr);
+				data_bde++;
+			} else {
+				bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+				bpl->tus.f.bdeSize = sg_dma_len(sgel);
+				bpl->tus.w = le32_to_cpu(bpl->tus.w);
+				bpl->addrLow =
+					le32_to_cpu(putPaddrLow(physaddr));
+				bpl->addrHigh =
+					le32_to_cpu(putPaddrHigh(physaddr));
+				bpl++;
+			}
+		}
+	}
+
+	/*
+	 * Finish initializing those IOCB fields that are dependent on the
+	 * scsi_cmnd request_buffer.  Note that for SLI-2 the bdeSize is
+	 * explicitly reinitialized and for SLI-3 the extended bde count is
+	 * explicitly reinitialized since all iocb memory resources are reused.
+	 */
+	if (phba->sli_rev == 3 &&
+	    !(phba->sli3_options & LPFC_SLI3_BG_ENABLED) &&
+	    !(iocbq->cmd_flag & DSS_SECURITY_OP)) {
+		if (num_bde > LPFC_EXT_DATA_BDE_COUNT) {
+			/*
+			 * The extended IOCB format can only fit 3 BDE or a BPL.
+			 * This I/O has more than 3 BDE so the 1st data bde will
+			 * be a BPL that is filled in here.
+			 */
+			physaddr = lpfc_cmd->dma_handle;
+			data_bde->tus.f.bdeFlags = BUFF_TYPE_BLP_64;
+			data_bde->tus.f.bdeSize = (num_bde *
+						   sizeof(struct ulp_bde64));
+			physaddr += (sizeof(struct fcp_cmnd) +
+				     sizeof(struct fcp_rsp) +
+				     (2 * sizeof(struct ulp_bde64)));
+			data_bde->addrHigh = putPaddrHigh(physaddr);
+			data_bde->addrLow = putPaddrLow(physaddr);
+			/* ebde count includes the response bde and data bpl */
+			iocb_cmd->unsli3.fcp_ext.ebde_count = 2;
+		} else {
+			/* ebde count includes the response bde and data bdes */
+			iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
+		}
+	} else {
+		iocb_cmd->un.fcpi64.bdl.bdeSize =
+			((num_bde + 2) * sizeof(struct ulp_bde64));
+		iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
+	}
+	fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
+
+	/*
+	 * Due to difference in data length between DIF/non-DIF paths,
+	 * we need to set word 4 of IOCB here
+	 */
+	iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
+	lpfc_fcpcmd_to_iocb(iocb_cmd->unsli3.fcp_ext.icd, fcp_cmnd);
+	return 0;
+}
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+
+/* Return BG_ERR_INIT if error injection is detected by Initiator */
+#define BG_ERR_INIT	0x1
+/* Return BG_ERR_TGT if error injection is detected by Target */
+#define BG_ERR_TGT	0x2
+/* Return BG_ERR_SWAP if swapping CSUM<-->CRC is required for error injection */
+#define BG_ERR_SWAP	0x10
+/*
+ * Return BG_ERR_CHECK if disabling Guard/Ref/App checking is required for
+ * error injection
+ */
+#define BG_ERR_CHECK	0x20
+
+/**
+ * lpfc_bg_err_inject - Determine if we should inject an error
+ * @phba: The Hba for which this call is being executed.
+ * @sc: The SCSI command to examine
+ * @reftag: (out) BlockGuard reference tag for transmitted data
+ * @apptag: (out) BlockGuard application tag for transmitted data
+ * @new_guard: (in) Value to replace CRC with if needed
+ *
+ * Returns BG_ERR_* bit mask or 0 if request ignored
+ **/
+static int
+lpfc_bg_err_inject(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		uint32_t *reftag, uint16_t *apptag, uint32_t new_guard)
+{
+	struct scatterlist *sgpe; /* s/g prot entry */
+	struct lpfc_io_buf *lpfc_cmd = NULL;
+	struct scsi_dif_tuple *src = NULL;
+	struct lpfc_nodelist *ndlp;
+	struct lpfc_rport_data *rdata;
+	uint32_t op = scsi_get_prot_op(sc);
+	uint32_t blksize;
+	uint32_t numblks;
+	u32 lba;
+	int rc = 0;
+	int blockoff = 0;
+
+	if (op == SCSI_PROT_NORMAL)
+		return 0;
+
+	sgpe = scsi_prot_sglist(sc);
+	lba = scsi_prot_ref_tag(sc);
+
+	/* First check if we need to match the LBA */
+	if (phba->lpfc_injerr_lba != LPFC_INJERR_LBA_OFF) {
+		blksize = scsi_prot_interval(sc);
+		numblks = (scsi_bufflen(sc) + blksize - 1) / blksize;
+
+		/* Make sure we have the right LBA if one is specified */
+		if (phba->lpfc_injerr_lba < (u64)lba ||
+		    (phba->lpfc_injerr_lba >= (u64)(lba + numblks)))
+			return 0;
+		if (sgpe) {
+			blockoff = phba->lpfc_injerr_lba - (u64)lba;
+			numblks = sg_dma_len(sgpe) /
+				sizeof(struct scsi_dif_tuple);
+			if (numblks < blockoff)
+				blockoff = numblks;
+		}
+	}
+
+	/* Next check if we need to match the remote NPortID or WWPN */
+	rdata = lpfc_rport_data_from_scsi_device(sc->device);
+	if (rdata && rdata->pnode) {
+		ndlp = rdata->pnode;
+
+		/* Make sure we have the right NPortID if one is specified */
+		if (phba->lpfc_injerr_nportid  &&
+			(phba->lpfc_injerr_nportid != ndlp->nlp_DID))
+			return 0;
+
+		/*
+		 * Make sure we have the right WWPN if one is specified.
+		 * wwn[0] should be a non-zero NAA in a good WWPN.
+		 */
+		if (phba->lpfc_injerr_wwpn.u.wwn[0]  &&
+			(memcmp(&ndlp->nlp_portname, &phba->lpfc_injerr_wwpn,
+				sizeof(struct lpfc_name)) != 0))
+			return 0;
+	}
+
+	/* Setup a ptr to the protection data if the SCSI host provides it */
+	if (sgpe) {
+		src = (struct scsi_dif_tuple *)sg_virt(sgpe);
+		src += blockoff;
+		lpfc_cmd = (struct lpfc_io_buf *)sc->host_scribble;
+	}
+
+	/* Should we change the Reference Tag */
+	if (reftag) {
+		if (phba->lpfc_injerr_wref_cnt) {
+			switch (op) {
+			case SCSI_PROT_WRITE_PASS:
+				if (src) {
+					/*
+					 * For WRITE_PASS, force the error
+					 * to be sent on the wire. It should
+					 * be detected by the Target.
+					 * If blockoff != 0 error will be
+					 * inserted in middle of the IO.
+					 */
+
+					lpfc_printf_log(phba, KERN_ERR,
+							LOG_TRACE_EVENT,
+					"9076 BLKGRD: Injecting reftag error: "
+					"write lba x%lx + x%x oldrefTag x%x\n",
+					(unsigned long)lba, blockoff,
+					be32_to_cpu(src->ref_tag));
+
+					/*
+					 * Save the old ref_tag so we can
+					 * restore it on completion.
+					 */
+					if (lpfc_cmd) {
+						lpfc_cmd->prot_data_type =
+							LPFC_INJERR_REFTAG;
+						lpfc_cmd->prot_data_segment =
+							src;
+						lpfc_cmd->prot_data =
+							src->ref_tag;
+					}
+					src->ref_tag = cpu_to_be32(0xDEADBEEF);
+					phba->lpfc_injerr_wref_cnt--;
+					if (phba->lpfc_injerr_wref_cnt == 0) {
+						phba->lpfc_injerr_nportid = 0;
+						phba->lpfc_injerr_lba =
+							LPFC_INJERR_LBA_OFF;
+						memset(&phba->lpfc_injerr_wwpn,
+						  0, sizeof(struct lpfc_name));
+					}
+					rc = BG_ERR_TGT | BG_ERR_CHECK;
+
+					break;
+				}
+				fallthrough;
+			case SCSI_PROT_WRITE_INSERT:
+				/*
+				 * For WRITE_INSERT, force the error
+				 * to be sent on the wire. It should be
+				 * detected by the Target.
+				 */
+				/* DEADBEEF will be the reftag on the wire */
+				*reftag = 0xDEADBEEF;
+				phba->lpfc_injerr_wref_cnt--;
+				if (phba->lpfc_injerr_wref_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+					LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_TGT | BG_ERR_CHECK;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9078 BLKGRD: Injecting reftag error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			case SCSI_PROT_WRITE_STRIP:
+				/*
+				 * For WRITE_STRIP and WRITE_PASS,
+				 * force the error on data
+				 * being copied from SLI-Host to SLI-Port.
+				 */
+				*reftag = 0xDEADBEEF;
+				phba->lpfc_injerr_wref_cnt--;
+				if (phba->lpfc_injerr_wref_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_INIT;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9077 BLKGRD: Injecting reftag error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			}
+		}
+		if (phba->lpfc_injerr_rref_cnt) {
+			switch (op) {
+			case SCSI_PROT_READ_INSERT:
+			case SCSI_PROT_READ_STRIP:
+			case SCSI_PROT_READ_PASS:
+				/*
+				 * For READ_STRIP and READ_PASS, force the
+				 * error on data being read off the wire. It
+				 * should force an IO error to the driver.
+				 */
+				*reftag = 0xDEADBEEF;
+				phba->lpfc_injerr_rref_cnt--;
+				if (phba->lpfc_injerr_rref_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_INIT;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9079 BLKGRD: Injecting reftag error: "
+					"read lba x%lx\n", (unsigned long)lba);
+				break;
+			}
+		}
+	}
+
+	/* Should we change the Application Tag */
+	if (apptag) {
+		if (phba->lpfc_injerr_wapp_cnt) {
+			switch (op) {
+			case SCSI_PROT_WRITE_PASS:
+				if (src) {
+					/*
+					 * For WRITE_PASS, force the error
+					 * to be sent on the wire. It should
+					 * be detected by the Target.
+					 * If blockoff != 0 error will be
+					 * inserted in middle of the IO.
+					 */
+
+					lpfc_printf_log(phba, KERN_ERR,
+							LOG_TRACE_EVENT,
+					"9080 BLKGRD: Injecting apptag error: "
+					"write lba x%lx + x%x oldappTag x%x\n",
+					(unsigned long)lba, blockoff,
+					be16_to_cpu(src->app_tag));
+
+					/*
+					 * Save the old app_tag so we can
+					 * restore it on completion.
+					 */
+					if (lpfc_cmd) {
+						lpfc_cmd->prot_data_type =
+							LPFC_INJERR_APPTAG;
+						lpfc_cmd->prot_data_segment =
+							src;
+						lpfc_cmd->prot_data =
+							src->app_tag;
+					}
+					src->app_tag = cpu_to_be16(0xDEAD);
+					phba->lpfc_injerr_wapp_cnt--;
+					if (phba->lpfc_injerr_wapp_cnt == 0) {
+						phba->lpfc_injerr_nportid = 0;
+						phba->lpfc_injerr_lba =
+							LPFC_INJERR_LBA_OFF;
+						memset(&phba->lpfc_injerr_wwpn,
+						  0, sizeof(struct lpfc_name));
+					}
+					rc = BG_ERR_TGT | BG_ERR_CHECK;
+					break;
+				}
+				fallthrough;
+			case SCSI_PROT_WRITE_INSERT:
+				/*
+				 * For WRITE_INSERT, force the
+				 * error to be sent on the wire. It should be
+				 * detected by the Target.
+				 */
+				/* DEAD will be the apptag on the wire */
+				*apptag = 0xDEAD;
+				phba->lpfc_injerr_wapp_cnt--;
+				if (phba->lpfc_injerr_wapp_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_TGT | BG_ERR_CHECK;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0813 BLKGRD: Injecting apptag error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			case SCSI_PROT_WRITE_STRIP:
+				/*
+				 * For WRITE_STRIP and WRITE_PASS,
+				 * force the error on data
+				 * being copied from SLI-Host to SLI-Port.
+				 */
+				*apptag = 0xDEAD;
+				phba->lpfc_injerr_wapp_cnt--;
+				if (phba->lpfc_injerr_wapp_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_INIT;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0812 BLKGRD: Injecting apptag error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			}
+		}
+		if (phba->lpfc_injerr_rapp_cnt) {
+			switch (op) {
+			case SCSI_PROT_READ_INSERT:
+			case SCSI_PROT_READ_STRIP:
+			case SCSI_PROT_READ_PASS:
+				/*
+				 * For READ_STRIP and READ_PASS, force the
+				 * error on data being read off the wire. It
+				 * should force an IO error to the driver.
+				 */
+				*apptag = 0xDEAD;
+				phba->lpfc_injerr_rapp_cnt--;
+				if (phba->lpfc_injerr_rapp_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+				rc = BG_ERR_INIT;
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0814 BLKGRD: Injecting apptag error: "
+					"read lba x%lx\n", (unsigned long)lba);
+				break;
+			}
+		}
+	}
+
+
+	/* Should we change the Guard Tag */
+	if (new_guard) {
+		if (phba->lpfc_injerr_wgrd_cnt) {
+			switch (op) {
+			case SCSI_PROT_WRITE_PASS:
+				rc = BG_ERR_CHECK;
+				fallthrough;
+
+			case SCSI_PROT_WRITE_INSERT:
+				/*
+				 * For WRITE_INSERT, force the
+				 * error to be sent on the wire. It should be
+				 * detected by the Target.
+				 */
+				phba->lpfc_injerr_wgrd_cnt--;
+				if (phba->lpfc_injerr_wgrd_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+
+				rc |= BG_ERR_TGT | BG_ERR_SWAP;
+				/* Signals the caller to swap CRC->CSUM */
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0817 BLKGRD: Injecting guard error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			case SCSI_PROT_WRITE_STRIP:
+				/*
+				 * For WRITE_STRIP and WRITE_PASS,
+				 * force the error on data
+				 * being copied from SLI-Host to SLI-Port.
+				 */
+				phba->lpfc_injerr_wgrd_cnt--;
+				if (phba->lpfc_injerr_wgrd_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+
+				rc = BG_ERR_INIT | BG_ERR_SWAP;
+				/* Signals the caller to swap CRC->CSUM */
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0816 BLKGRD: Injecting guard error: "
+					"write lba x%lx\n", (unsigned long)lba);
+				break;
+			}
+		}
+		if (phba->lpfc_injerr_rgrd_cnt) {
+			switch (op) {
+			case SCSI_PROT_READ_INSERT:
+			case SCSI_PROT_READ_STRIP:
+			case SCSI_PROT_READ_PASS:
+				/*
+				 * For READ_STRIP and READ_PASS, force the
+				 * error on data being read off the wire. It
+				 * should force an IO error to the driver.
+				 */
+				phba->lpfc_injerr_rgrd_cnt--;
+				if (phba->lpfc_injerr_rgrd_cnt == 0) {
+					phba->lpfc_injerr_nportid = 0;
+					phba->lpfc_injerr_lba =
+						LPFC_INJERR_LBA_OFF;
+					memset(&phba->lpfc_injerr_wwpn,
+						0, sizeof(struct lpfc_name));
+				}
+
+				rc = BG_ERR_INIT | BG_ERR_SWAP;
+				/* Signals the caller to swap CRC->CSUM */
+
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"0818 BLKGRD: Injecting guard error: "
+					"read lba x%lx\n", (unsigned long)lba);
+			}
+		}
+	}
+
+	return rc;
+}
+#endif
+
+/**
+ * lpfc_sc_to_bg_opcodes - Determine the BlockGuard opcodes to be used with
+ * the specified SCSI command.
+ * @phba: The Hba for which this call is being executed.
+ * @sc: The SCSI command to examine
+ * @txop: (out) BlockGuard operation for transmitted data
+ * @rxop: (out) BlockGuard operation for received data
+ *
+ * Returns: zero on success; non-zero if tx and/or rx op cannot be determined
+ *
+ **/
+static int
+lpfc_sc_to_bg_opcodes(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		uint8_t *txop, uint8_t *rxop)
+{
+	uint8_t ret = 0;
+
+	if (sc->prot_flags & SCSI_PROT_IP_CHECKSUM) {
+		switch (scsi_get_prot_op(sc)) {
+		case SCSI_PROT_READ_INSERT:
+		case SCSI_PROT_WRITE_STRIP:
+			*rxop = BG_OP_IN_NODIF_OUT_CSUM;
+			*txop = BG_OP_IN_CSUM_OUT_NODIF;
+			break;
+
+		case SCSI_PROT_READ_STRIP:
+		case SCSI_PROT_WRITE_INSERT:
+			*rxop = BG_OP_IN_CRC_OUT_NODIF;
+			*txop = BG_OP_IN_NODIF_OUT_CRC;
+			break;
+
+		case SCSI_PROT_READ_PASS:
+		case SCSI_PROT_WRITE_PASS:
+			*rxop = BG_OP_IN_CRC_OUT_CSUM;
+			*txop = BG_OP_IN_CSUM_OUT_CRC;
+			break;
+
+		case SCSI_PROT_NORMAL:
+		default:
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+				"9063 BLKGRD: Bad op/guard:%d/IP combination\n",
+					scsi_get_prot_op(sc));
+			ret = 1;
+			break;
+
+		}
+	} else {
+		switch (scsi_get_prot_op(sc)) {
+		case SCSI_PROT_READ_STRIP:
+		case SCSI_PROT_WRITE_INSERT:
+			*rxop = BG_OP_IN_CRC_OUT_NODIF;
+			*txop = BG_OP_IN_NODIF_OUT_CRC;
+			break;
+
+		case SCSI_PROT_READ_PASS:
+		case SCSI_PROT_WRITE_PASS:
+			*rxop = BG_OP_IN_CRC_OUT_CRC;
+			*txop = BG_OP_IN_CRC_OUT_CRC;
+			break;
+
+		case SCSI_PROT_READ_INSERT:
+		case SCSI_PROT_WRITE_STRIP:
+			*rxop = BG_OP_IN_NODIF_OUT_CRC;
+			*txop = BG_OP_IN_CRC_OUT_NODIF;
+			break;
+
+		case SCSI_PROT_NORMAL:
+		default:
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+				"9075 BLKGRD: Bad op/guard:%d/CRC combination\n",
+					scsi_get_prot_op(sc));
+			ret = 1;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+/**
+ * lpfc_bg_err_opcodes - reDetermine the BlockGuard opcodes to be used with
+ * the specified SCSI command in order to force a guard tag error.
+ * @phba: The Hba for which this call is being executed.
+ * @sc: The SCSI command to examine
+ * @txop: (out) BlockGuard operation for transmitted data
+ * @rxop: (out) BlockGuard operation for received data
+ *
+ * Returns: zero on success; non-zero if tx and/or rx op cannot be determined
+ *
+ **/
+static int
+lpfc_bg_err_opcodes(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		uint8_t *txop, uint8_t *rxop)
+{
+
+	if (sc->prot_flags & SCSI_PROT_IP_CHECKSUM) {
+		switch (scsi_get_prot_op(sc)) {
+		case SCSI_PROT_READ_INSERT:
+		case SCSI_PROT_WRITE_STRIP:
+			*rxop = BG_OP_IN_NODIF_OUT_CRC;
+			*txop = BG_OP_IN_CRC_OUT_NODIF;
+			break;
+
+		case SCSI_PROT_READ_STRIP:
+		case SCSI_PROT_WRITE_INSERT:
+			*rxop = BG_OP_IN_CSUM_OUT_NODIF;
+			*txop = BG_OP_IN_NODIF_OUT_CSUM;
+			break;
+
+		case SCSI_PROT_READ_PASS:
+		case SCSI_PROT_WRITE_PASS:
+			*rxop = BG_OP_IN_CSUM_OUT_CRC;
+			*txop = BG_OP_IN_CRC_OUT_CSUM;
+			break;
+
+		case SCSI_PROT_NORMAL:
+		default:
+			break;
+
+		}
+	} else {
+		switch (scsi_get_prot_op(sc)) {
+		case SCSI_PROT_READ_STRIP:
+		case SCSI_PROT_WRITE_INSERT:
+			*rxop = BG_OP_IN_CSUM_OUT_NODIF;
+			*txop = BG_OP_IN_NODIF_OUT_CSUM;
+			break;
+
+		case SCSI_PROT_READ_PASS:
+		case SCSI_PROT_WRITE_PASS:
+			*rxop = BG_OP_IN_CSUM_OUT_CSUM;
+			*txop = BG_OP_IN_CSUM_OUT_CSUM;
+			break;
+
+		case SCSI_PROT_READ_INSERT:
+		case SCSI_PROT_WRITE_STRIP:
+			*rxop = BG_OP_IN_NODIF_OUT_CSUM;
+			*txop = BG_OP_IN_CSUM_OUT_NODIF;
+			break;
+
+		case SCSI_PROT_NORMAL:
+		default:
+			break;
+		}
+	}
+
+	return 0;
+}
+#endif
+
+/**
+ * lpfc_bg_setup_bpl - Setup BlockGuard BPL with no protection data
+ * @phba: The Hba for which this call is being executed.
+ * @sc: pointer to scsi command we're working on
+ * @bpl: pointer to buffer list for protection groups
+ * @datasegcnt: number of segments of data that have been dma mapped
+ *
+ * This function sets up BPL buffer list for protection groups of
+ * type LPFC_PG_TYPE_NO_DIF
+ *
+ * This is usually used when the HBA is instructed to generate
+ * DIFs and insert them into data stream (or strip DIF from
+ * incoming data stream)
+ *
+ * The buffer list consists of just one protection group described
+ * below:
+ *                                +-------------------------+
+ *   start of prot group  -->     |          PDE_5          |
+ *                                +-------------------------+
+ *                                |          PDE_6          |
+ *                                +-------------------------+
+ *                                |         Data BDE        |
+ *                                +-------------------------+
+ *                                |more Data BDE's ... (opt)|
+ *                                +-------------------------+
+ *
+ *
+ * Note: Data s/g buffers have been dma mapped
+ *
+ * Returns the number of BDEs added to the BPL.
+ **/
+static int
+lpfc_bg_setup_bpl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		struct ulp_bde64 *bpl, int datasegcnt)
+{
+	struct scatterlist *sgde = NULL; /* s/g data entry */
+	struct lpfc_pde5 *pde5 = NULL;
+	struct lpfc_pde6 *pde6 = NULL;
+	dma_addr_t physaddr;
+	int i = 0, num_bde = 0, status;
+	int datadir = sc->sc_data_direction;
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	uint32_t rc;
+#endif
+	uint32_t checking = 1;
+	uint32_t reftag;
+	uint8_t txop, rxop;
+
+	status  = lpfc_sc_to_bg_opcodes(phba, sc, &txop, &rxop);
+	if (status)
+		goto out;
+
+	/* extract some info from the scsi command for pde*/
+	reftag = scsi_prot_ref_tag(sc);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	rc = lpfc_bg_err_inject(phba, sc, &reftag, NULL, 1);
+	if (rc) {
+		if (rc & BG_ERR_SWAP)
+			lpfc_bg_err_opcodes(phba, sc, &txop, &rxop);
+		if (rc & BG_ERR_CHECK)
+			checking = 0;
+	}
+#endif
+
+	/* setup PDE5 with what we have */
+	pde5 = (struct lpfc_pde5 *) bpl;
+	memset(pde5, 0, sizeof(struct lpfc_pde5));
+	bf_set(pde5_type, pde5, LPFC_PDE5_DESCRIPTOR);
+
+	/* Endianness conversion if necessary for PDE5 */
+	pde5->word0 = cpu_to_le32(pde5->word0);
+	pde5->reftag = cpu_to_le32(reftag);
+
+	/* advance bpl and increment bde count */
+	num_bde++;
+	bpl++;
+	pde6 = (struct lpfc_pde6 *) bpl;
+
+	/* setup PDE6 with the rest of the info */
+	memset(pde6, 0, sizeof(struct lpfc_pde6));
+	bf_set(pde6_type, pde6, LPFC_PDE6_DESCRIPTOR);
+	bf_set(pde6_optx, pde6, txop);
+	bf_set(pde6_oprx, pde6, rxop);
+
+	/*
+	 * We only need to check the data on READs, for WRITEs
+	 * protection data is automatically generated, not checked.
+	 */
+	if (datadir == DMA_FROM_DEVICE) {
+		if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+			bf_set(pde6_ce, pde6, checking);
+		else
+			bf_set(pde6_ce, pde6, 0);
+
+		if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+			bf_set(pde6_re, pde6, checking);
+		else
+			bf_set(pde6_re, pde6, 0);
+	}
+	bf_set(pde6_ai, pde6, 1);
+	bf_set(pde6_ae, pde6, 0);
+	bf_set(pde6_apptagval, pde6, 0);
+
+	/* Endianness conversion if necessary for PDE6 */
+	pde6->word0 = cpu_to_le32(pde6->word0);
+	pde6->word1 = cpu_to_le32(pde6->word1);
+	pde6->word2 = cpu_to_le32(pde6->word2);
+
+	/* advance bpl and increment bde count */
+	num_bde++;
+	bpl++;
+
+	/* assumption: caller has already run dma_map_sg on command data */
+	scsi_for_each_sg(sc, sgde, datasegcnt, i) {
+		physaddr = sg_dma_address(sgde);
+		bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
+		bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
+		bpl->tus.f.bdeSize = sg_dma_len(sgde);
+		if (datadir == DMA_TO_DEVICE)
+			bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+		else
+			bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
+		bpl->tus.w = le32_to_cpu(bpl->tus.w);
+		bpl++;
+		num_bde++;
+	}
+
+out:
+	return num_bde;
+}
+
+/**
+ * lpfc_bg_setup_bpl_prot - Setup BlockGuard BPL with protection data
+ * @phba: The Hba for which this call is being executed.
+ * @sc: pointer to scsi command we're working on
+ * @bpl: pointer to buffer list for protection groups
+ * @datacnt: number of segments of data that have been dma mapped
+ * @protcnt: number of segment of protection data that have been dma mapped
+ *
+ * This function sets up BPL buffer list for protection groups of
+ * type LPFC_PG_TYPE_DIF
+ *
+ * This is usually used when DIFs are in their own buffers,
+ * separate from the data. The HBA can then by instructed
+ * to place the DIFs in the outgoing stream.  For read operations,
+ * The HBA could extract the DIFs and place it in DIF buffers.
+ *
+ * The buffer list for this type consists of one or more of the
+ * protection groups described below:
+ *                                    +-------------------------+
+ *   start of first prot group  -->   |          PDE_5          |
+ *                                    +-------------------------+
+ *                                    |          PDE_6          |
+ *                                    +-------------------------+
+ *                                    |      PDE_7 (Prot BDE)   |
+ *                                    +-------------------------+
+ *                                    |        Data BDE         |
+ *                                    +-------------------------+
+ *                                    |more Data BDE's ... (opt)|
+ *                                    +-------------------------+
+ *   start of new  prot group  -->    |          PDE_5          |
+ *                                    +-------------------------+
+ *                                    |          ...            |
+ *                                    +-------------------------+
+ *
+ * Note: It is assumed that both data and protection s/g buffers have been
+ *       mapped for DMA
+ *
+ * Returns the number of BDEs added to the BPL.
+ **/
+static int
+lpfc_bg_setup_bpl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		struct ulp_bde64 *bpl, int datacnt, int protcnt)
+{
+	struct scatterlist *sgde = NULL; /* s/g data entry */
+	struct scatterlist *sgpe = NULL; /* s/g prot entry */
+	struct lpfc_pde5 *pde5 = NULL;
+	struct lpfc_pde6 *pde6 = NULL;
+	struct lpfc_pde7 *pde7 = NULL;
+	dma_addr_t dataphysaddr, protphysaddr;
+	unsigned short curr_data = 0, curr_prot = 0;
+	unsigned int split_offset;
+	unsigned int protgroup_len, protgroup_offset = 0, protgroup_remainder;
+	unsigned int protgrp_blks, protgrp_bytes;
+	unsigned int remainder, subtotal;
+	int status;
+	int datadir = sc->sc_data_direction;
+	unsigned char pgdone = 0, alldone = 0;
+	unsigned blksize;
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	uint32_t rc;
+#endif
+	uint32_t checking = 1;
+	uint32_t reftag;
+	uint8_t txop, rxop;
+	int num_bde = 0;
+
+	sgpe = scsi_prot_sglist(sc);
+	sgde = scsi_sglist(sc);
+
+	if (!sgpe || !sgde) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+				"9020 Invalid s/g entry: data=x%px prot=x%px\n",
+				sgpe, sgde);
+		return 0;
+	}
+
+	status = lpfc_sc_to_bg_opcodes(phba, sc, &txop, &rxop);
+	if (status)
+		goto out;
+
+	/* extract some info from the scsi command */
+	blksize = scsi_prot_interval(sc);
+	reftag = scsi_prot_ref_tag(sc);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	rc = lpfc_bg_err_inject(phba, sc, &reftag, NULL, 1);
+	if (rc) {
+		if (rc & BG_ERR_SWAP)
+			lpfc_bg_err_opcodes(phba, sc, &txop, &rxop);
+		if (rc & BG_ERR_CHECK)
+			checking = 0;
+	}
+#endif
+
+	split_offset = 0;
+	do {
+		/* Check to see if we ran out of space */
+		if (num_bde >= (phba->cfg_total_seg_cnt - 2))
+			return num_bde + 3;
+
+		/* setup PDE5 with what we have */
+		pde5 = (struct lpfc_pde5 *) bpl;
+		memset(pde5, 0, sizeof(struct lpfc_pde5));
+		bf_set(pde5_type, pde5, LPFC_PDE5_DESCRIPTOR);
+
+		/* Endianness conversion if necessary for PDE5 */
+		pde5->word0 = cpu_to_le32(pde5->word0);
+		pde5->reftag = cpu_to_le32(reftag);
+
+		/* advance bpl and increment bde count */
+		num_bde++;
+		bpl++;
+		pde6 = (struct lpfc_pde6 *) bpl;
+
+		/* setup PDE6 with the rest of the info */
+		memset(pde6, 0, sizeof(struct lpfc_pde6));
+		bf_set(pde6_type, pde6, LPFC_PDE6_DESCRIPTOR);
+		bf_set(pde6_optx, pde6, txop);
+		bf_set(pde6_oprx, pde6, rxop);
+
+		if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+			bf_set(pde6_ce, pde6, checking);
+		else
+			bf_set(pde6_ce, pde6, 0);
+
+		if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+			bf_set(pde6_re, pde6, checking);
+		else
+			bf_set(pde6_re, pde6, 0);
+
+		bf_set(pde6_ai, pde6, 1);
+		bf_set(pde6_ae, pde6, 0);
+		bf_set(pde6_apptagval, pde6, 0);
+
+		/* Endianness conversion if necessary for PDE6 */
+		pde6->word0 = cpu_to_le32(pde6->word0);
+		pde6->word1 = cpu_to_le32(pde6->word1);
+		pde6->word2 = cpu_to_le32(pde6->word2);
+
+		/* advance bpl and increment bde count */
+		num_bde++;
+		bpl++;
+
+		/* setup the first BDE that points to protection buffer */
+		protphysaddr = sg_dma_address(sgpe) + protgroup_offset;
+		protgroup_len = sg_dma_len(sgpe) - protgroup_offset;
+
+		/* must be integer multiple of the DIF block length */
+		BUG_ON(protgroup_len % 8);
+
+		pde7 = (struct lpfc_pde7 *) bpl;
+		memset(pde7, 0, sizeof(struct lpfc_pde7));
+		bf_set(pde7_type, pde7, LPFC_PDE7_DESCRIPTOR);
+
+		pde7->addrHigh = le32_to_cpu(putPaddrHigh(protphysaddr));
+		pde7->addrLow = le32_to_cpu(putPaddrLow(protphysaddr));
+
+		protgrp_blks = protgroup_len / 8;
+		protgrp_bytes = protgrp_blks * blksize;
+
+		/* check if this pde is crossing the 4K boundary; if so split */
+		if ((pde7->addrLow & 0xfff) + protgroup_len > 0x1000) {
+			protgroup_remainder = 0x1000 - (pde7->addrLow & 0xfff);
+			protgroup_offset += protgroup_remainder;
+			protgrp_blks = protgroup_remainder / 8;
+			protgrp_bytes = protgrp_blks * blksize;
+		} else {
+			protgroup_offset = 0;
+			curr_prot++;
+		}
+
+		num_bde++;
+
+		/* setup BDE's for data blocks associated with DIF data */
+		pgdone = 0;
+		subtotal = 0; /* total bytes processed for current prot grp */
+		while (!pgdone) {
+			/* Check to see if we ran out of space */
+			if (num_bde >= phba->cfg_total_seg_cnt)
+				return num_bde + 1;
+
+			if (!sgde) {
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9065 BLKGRD:%s Invalid data segment\n",
+						__func__);
+				return 0;
+			}
+			bpl++;
+			dataphysaddr = sg_dma_address(sgde) + split_offset;
+			bpl->addrLow = le32_to_cpu(putPaddrLow(dataphysaddr));
+			bpl->addrHigh = le32_to_cpu(putPaddrHigh(dataphysaddr));
+
+			remainder = sg_dma_len(sgde) - split_offset;
+
+			if ((subtotal + remainder) <= protgrp_bytes) {
+				/* we can use this whole buffer */
+				bpl->tus.f.bdeSize = remainder;
+				split_offset = 0;
+
+				if ((subtotal + remainder) == protgrp_bytes)
+					pgdone = 1;
+			} else {
+				/* must split this buffer with next prot grp */
+				bpl->tus.f.bdeSize = protgrp_bytes - subtotal;
+				split_offset += bpl->tus.f.bdeSize;
+			}
+
+			subtotal += bpl->tus.f.bdeSize;
+
+			if (datadir == DMA_TO_DEVICE)
+				bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+			else
+				bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
+			bpl->tus.w = le32_to_cpu(bpl->tus.w);
+
+			num_bde++;
+			curr_data++;
+
+			if (split_offset)
+				break;
+
+			/* Move to the next s/g segment if possible */
+			sgde = sg_next(sgde);
+
+		}
+
+		if (protgroup_offset) {
+			/* update the reference tag */
+			reftag += protgrp_blks;
+			bpl++;
+			continue;
+		}
+
+		/* are we done ? */
+		if (curr_prot == protcnt) {
+			alldone = 1;
+		} else if (curr_prot < protcnt) {
+			/* advance to next prot buffer */
+			sgpe = sg_next(sgpe);
+			bpl++;
+
+			/* update the reference tag */
+			reftag += protgrp_blks;
+		} else {
+			/* if we're here, we have a bug */
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9054 BLKGRD: bug in %s\n", __func__);
+		}
+
+	} while (!alldone);
+out:
+
+	return num_bde;
+}
+
+/**
+ * lpfc_bg_setup_sgl - Setup BlockGuard SGL with no protection data
+ * @phba: The Hba for which this call is being executed.
+ * @sc: pointer to scsi command we're working on
+ * @sgl: pointer to buffer list for protection groups
+ * @datasegcnt: number of segments of data that have been dma mapped
+ * @lpfc_cmd: lpfc scsi command object pointer.
+ *
+ * This function sets up SGL buffer list for protection groups of
+ * type LPFC_PG_TYPE_NO_DIF
+ *
+ * This is usually used when the HBA is instructed to generate
+ * DIFs and insert them into data stream (or strip DIF from
+ * incoming data stream)
+ *
+ * The buffer list consists of just one protection group described
+ * below:
+ *                                +-------------------------+
+ *   start of prot group  -->     |         DI_SEED         |
+ *                                +-------------------------+
+ *                                |         Data SGE        |
+ *                                +-------------------------+
+ *                                |more Data SGE's ... (opt)|
+ *                                +-------------------------+
+ *
+ *
+ * Note: Data s/g buffers have been dma mapped
+ *
+ * Returns the number of SGEs added to the SGL.
+ **/
+static int
+lpfc_bg_setup_sgl(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		struct sli4_sge *sgl, int datasegcnt,
+		struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scatterlist *sgde = NULL; /* s/g data entry */
+	struct sli4_sge_diseed *diseed = NULL;
+	dma_addr_t physaddr;
+	int i = 0, num_sge = 0, status;
+	uint32_t reftag;
+	uint8_t txop, rxop;
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	uint32_t rc;
+#endif
+	uint32_t checking = 1;
+	uint32_t dma_len;
+	uint32_t dma_offset = 0;
+	struct sli4_hybrid_sgl *sgl_xtra = NULL;
+	int j;
+	bool lsp_just_set = false;
+
+	status  = lpfc_sc_to_bg_opcodes(phba, sc, &txop, &rxop);
+	if (status)
+		goto out;
+
+	/* extract some info from the scsi command for pde*/
+	reftag = scsi_prot_ref_tag(sc);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	rc = lpfc_bg_err_inject(phba, sc, &reftag, NULL, 1);
+	if (rc) {
+		if (rc & BG_ERR_SWAP)
+			lpfc_bg_err_opcodes(phba, sc, &txop, &rxop);
+		if (rc & BG_ERR_CHECK)
+			checking = 0;
+	}
+#endif
+
+	/* setup DISEED with what we have */
+	diseed = (struct sli4_sge_diseed *) sgl;
+	memset(diseed, 0, sizeof(struct sli4_sge_diseed));
+	bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_DISEED);
+
+	/* Endianness conversion if necessary */
+	diseed->ref_tag = cpu_to_le32(reftag);
+	diseed->ref_tag_tran = diseed->ref_tag;
+
+	/*
+	 * We only need to check the data on READs, for WRITEs
+	 * protection data is automatically generated, not checked.
+	 */
+	if (sc->sc_data_direction == DMA_FROM_DEVICE) {
+		if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+			bf_set(lpfc_sli4_sge_dif_ce, diseed, checking);
+		else
+			bf_set(lpfc_sli4_sge_dif_ce, diseed, 0);
+
+		if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+			bf_set(lpfc_sli4_sge_dif_re, diseed, checking);
+		else
+			bf_set(lpfc_sli4_sge_dif_re, diseed, 0);
+	}
+
+	/* setup DISEED with the rest of the info */
+	bf_set(lpfc_sli4_sge_dif_optx, diseed, txop);
+	bf_set(lpfc_sli4_sge_dif_oprx, diseed, rxop);
+
+	bf_set(lpfc_sli4_sge_dif_ai, diseed, 1);
+	bf_set(lpfc_sli4_sge_dif_me, diseed, 0);
+
+	/* Endianness conversion if necessary for DISEED */
+	diseed->word2 = cpu_to_le32(diseed->word2);
+	diseed->word3 = cpu_to_le32(diseed->word3);
+
+	/* advance bpl and increment sge count */
+	num_sge++;
+	sgl++;
+
+	/* assumption: caller has already run dma_map_sg on command data */
+	sgde = scsi_sglist(sc);
+	j = 3;
+	for (i = 0; i < datasegcnt; i++) {
+		/* clear it */
+		sgl->word2 = 0;
+
+		/* do we need to expand the segment */
+		if (!lsp_just_set && !((j + 1) % phba->border_sge_num) &&
+		    ((datasegcnt - 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_cmd);
+
+			if (unlikely(!sgl_xtra)) {
+				lpfc_cmd->seg_cnt = 0;
+				return 0;
+			}
+			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 ((datasegcnt - 1) == i)
+				bf_set(lpfc_sli4_sge_last, sgl, 1);
+			physaddr = sg_dma_address(sgde);
+			dma_len = sg_dma_len(sgde);
+			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;
+			sgde = sg_next(sgde);
+
+			sgl++;
+			num_sge++;
+			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++;
+
+	}
+
+out:
+	return num_sge;
+}
+
+/**
+ * lpfc_bg_setup_sgl_prot - Setup BlockGuard SGL with protection data
+ * @phba: The Hba for which this call is being executed.
+ * @sc: pointer to scsi command we're working on
+ * @sgl: pointer to buffer list for protection groups
+ * @datacnt: number of segments of data that have been dma mapped
+ * @protcnt: number of segment of protection data that have been dma mapped
+ * @lpfc_cmd: lpfc scsi command object pointer.
+ *
+ * This function sets up SGL buffer list for protection groups of
+ * type LPFC_PG_TYPE_DIF
+ *
+ * This is usually used when DIFs are in their own buffers,
+ * separate from the data. The HBA can then by instructed
+ * to place the DIFs in the outgoing stream.  For read operations,
+ * The HBA could extract the DIFs and place it in DIF buffers.
+ *
+ * The buffer list for this type consists of one or more of the
+ * protection groups described below:
+ *                                    +-------------------------+
+ *   start of first prot group  -->   |         DISEED          |
+ *                                    +-------------------------+
+ *                                    |      DIF (Prot SGE)     |
+ *                                    +-------------------------+
+ *                                    |        Data SGE         |
+ *                                    +-------------------------+
+ *                                    |more Data SGE's ... (opt)|
+ *                                    +-------------------------+
+ *   start of new  prot group  -->    |         DISEED          |
+ *                                    +-------------------------+
+ *                                    |          ...            |
+ *                                    +-------------------------+
+ *
+ * Note: It is assumed that both data and protection s/g buffers have been
+ *       mapped for DMA
+ *
+ * Returns the number of SGEs added to the SGL.
+ **/
+static int
+lpfc_bg_setup_sgl_prot(struct lpfc_hba *phba, struct scsi_cmnd *sc,
+		struct sli4_sge *sgl, int datacnt, int protcnt,
+		struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scatterlist *sgde = NULL; /* s/g data entry */
+	struct scatterlist *sgpe = NULL; /* s/g prot entry */
+	struct sli4_sge_diseed *diseed = NULL;
+	dma_addr_t dataphysaddr, protphysaddr;
+	unsigned short curr_data = 0, curr_prot = 0;
+	unsigned int split_offset;
+	unsigned int protgroup_len, protgroup_offset = 0, protgroup_remainder;
+	unsigned int protgrp_blks, protgrp_bytes;
+	unsigned int remainder, subtotal;
+	int status;
+	unsigned char pgdone = 0, alldone = 0;
+	unsigned blksize;
+	uint32_t reftag;
+	uint8_t txop, rxop;
+	uint32_t dma_len;
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	uint32_t rc;
+#endif
+	uint32_t checking = 1;
+	uint32_t dma_offset = 0;
+	int num_sge = 0, j = 2;
+	struct sli4_hybrid_sgl *sgl_xtra = NULL;
+
+	sgpe = scsi_prot_sglist(sc);
+	sgde = scsi_sglist(sc);
+
+	if (!sgpe || !sgde) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+				"9082 Invalid s/g entry: data=x%px prot=x%px\n",
+				sgpe, sgde);
+		return 0;
+	}
+
+	status = lpfc_sc_to_bg_opcodes(phba, sc, &txop, &rxop);
+	if (status)
+		goto out;
+
+	/* extract some info from the scsi command */
+	blksize = scsi_prot_interval(sc);
+	reftag = scsi_prot_ref_tag(sc);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	rc = lpfc_bg_err_inject(phba, sc, &reftag, NULL, 1);
+	if (rc) {
+		if (rc & BG_ERR_SWAP)
+			lpfc_bg_err_opcodes(phba, sc, &txop, &rxop);
+		if (rc & BG_ERR_CHECK)
+			checking = 0;
+	}
+#endif
+
+	split_offset = 0;
+	do {
+		/* Check to see if we ran out of space */
+		if ((num_sge >= (phba->cfg_total_seg_cnt - 2)) &&
+		    !(phba->cfg_xpsgl))
+			return num_sge + 3;
+
+		/* DISEED and DIF have to be together */
+		if (!((j + 1) % phba->border_sge_num) ||
+		    !((j + 2) % phba->border_sge_num) ||
+		    !((j + 3) % phba->border_sge_num)) {
+			sgl->word2 = 0;
+
+			/* set LSP type */
+			bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_LSP);
+
+			sgl_xtra = lpfc_get_sgl_per_hdwq(phba, lpfc_cmd);
+
+			if (unlikely(!sgl_xtra)) {
+				goto out;
+			} else {
+				sgl->addr_lo = cpu_to_le32(putPaddrLow(
+						sgl_xtra->dma_phys_sgl));
+				sgl->addr_hi = cpu_to_le32(putPaddrHigh(
+						       sgl_xtra->dma_phys_sgl));
+			}
+
+			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;
+			j = 0;
+		}
+
+		/* setup DISEED with what we have */
+		diseed = (struct sli4_sge_diseed *) sgl;
+		memset(diseed, 0, sizeof(struct sli4_sge_diseed));
+		bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_DISEED);
+
+		/* Endianness conversion if necessary */
+		diseed->ref_tag = cpu_to_le32(reftag);
+		diseed->ref_tag_tran = diseed->ref_tag;
+
+		if (sc->prot_flags & SCSI_PROT_GUARD_CHECK) {
+			bf_set(lpfc_sli4_sge_dif_ce, diseed, checking);
+		} else {
+			bf_set(lpfc_sli4_sge_dif_ce, diseed, 0);
+			/*
+			 * When in this mode, the hardware will replace
+			 * the guard tag from the host with a
+			 * newly generated good CRC for the wire.
+			 * Switch to raw mode here to avoid this
+			 * behavior. What the host sends gets put on the wire.
+			 */
+			if (txop == BG_OP_IN_CRC_OUT_CRC) {
+				txop = BG_OP_RAW_MODE;
+				rxop = BG_OP_RAW_MODE;
+			}
+		}
+
+
+		if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+			bf_set(lpfc_sli4_sge_dif_re, diseed, checking);
+		else
+			bf_set(lpfc_sli4_sge_dif_re, diseed, 0);
+
+		/* setup DISEED with the rest of the info */
+		bf_set(lpfc_sli4_sge_dif_optx, diseed, txop);
+		bf_set(lpfc_sli4_sge_dif_oprx, diseed, rxop);
+
+		bf_set(lpfc_sli4_sge_dif_ai, diseed, 1);
+		bf_set(lpfc_sli4_sge_dif_me, diseed, 0);
+
+		/* Endianness conversion if necessary for DISEED */
+		diseed->word2 = cpu_to_le32(diseed->word2);
+		diseed->word3 = cpu_to_le32(diseed->word3);
+
+		/* advance sgl and increment bde count */
+		num_sge++;
+
+		sgl++;
+		j++;
+
+		/* setup the first BDE that points to protection buffer */
+		protphysaddr = sg_dma_address(sgpe) + protgroup_offset;
+		protgroup_len = sg_dma_len(sgpe) - protgroup_offset;
+
+		/* must be integer multiple of the DIF block length */
+		BUG_ON(protgroup_len % 8);
+
+		/* Now setup DIF SGE */
+		sgl->word2 = 0;
+		bf_set(lpfc_sli4_sge_type, sgl, LPFC_SGE_TYPE_DIF);
+		sgl->addr_hi = le32_to_cpu(putPaddrHigh(protphysaddr));
+		sgl->addr_lo = le32_to_cpu(putPaddrLow(protphysaddr));
+		sgl->word2 = cpu_to_le32(sgl->word2);
+		sgl->sge_len = 0;
+
+		protgrp_blks = protgroup_len / 8;
+		protgrp_bytes = protgrp_blks * blksize;
+
+		/* check if DIF SGE is crossing the 4K boundary; if so split */
+		if ((sgl->addr_lo & 0xfff) + protgroup_len > 0x1000) {
+			protgroup_remainder = 0x1000 - (sgl->addr_lo & 0xfff);
+			protgroup_offset += protgroup_remainder;
+			protgrp_blks = protgroup_remainder / 8;
+			protgrp_bytes = protgrp_blks * blksize;
+		} else {
+			protgroup_offset = 0;
+			curr_prot++;
+		}
+
+		num_sge++;
+
+		/* setup SGE's for data blocks associated with DIF data */
+		pgdone = 0;
+		subtotal = 0; /* total bytes processed for current prot grp */
+
+		sgl++;
+		j++;
+
+		while (!pgdone) {
+			/* Check to see if we ran out of space */
+			if ((num_sge >= phba->cfg_total_seg_cnt) &&
+			    !phba->cfg_xpsgl)
+				return num_sge + 1;
+
+			if (!sgde) {
+				lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9086 BLKGRD:%s Invalid data segment\n",
+						__func__);
+				return 0;
+			}
+
+			if (!((j + 1) % phba->border_sge_num)) {
+				sgl->word2 = 0;
+
+				/* set LSP type */
+				bf_set(lpfc_sli4_sge_type, sgl,
+				       LPFC_SGE_TYPE_LSP);
+
+				sgl_xtra = lpfc_get_sgl_per_hdwq(phba,
+								 lpfc_cmd);
+
+				if (unlikely(!sgl_xtra)) {
+					goto out;
+				} else {
+					sgl->addr_lo = cpu_to_le32(
+					  putPaddrLow(sgl_xtra->dma_phys_sgl));
+					sgl->addr_hi = cpu_to_le32(
+					  putPaddrHigh(sgl_xtra->dma_phys_sgl));
+				}
+
+				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;
+			} else {
+				dataphysaddr = sg_dma_address(sgde) +
+								   split_offset;
+
+				remainder = sg_dma_len(sgde) - split_offset;
+
+				if ((subtotal + remainder) <= protgrp_bytes) {
+					/* we can use this whole buffer */
+					dma_len = remainder;
+					split_offset = 0;
+
+					if ((subtotal + remainder) ==
+								  protgrp_bytes)
+						pgdone = 1;
+				} else {
+					/* must split this buffer with next
+					 * prot grp
+					 */
+					dma_len = protgrp_bytes - subtotal;
+					split_offset += dma_len;
+				}
+
+				subtotal += dma_len;
+
+				sgl->word2 = 0;
+				sgl->addr_lo = cpu_to_le32(putPaddrLow(
+								 dataphysaddr));
+				sgl->addr_hi = cpu_to_le32(putPaddrHigh(
+								 dataphysaddr));
+				bf_set(lpfc_sli4_sge_last, sgl, 0);
+				bf_set(lpfc_sli4_sge_offset, sgl, dma_offset);
+				bf_set(lpfc_sli4_sge_type, sgl,
+				       LPFC_SGE_TYPE_DATA);
+
+				sgl->sge_len = cpu_to_le32(dma_len);
+				dma_offset += dma_len;
+
+				num_sge++;
+				curr_data++;
+
+				if (split_offset) {
+					sgl++;
+					j++;
+					break;
+				}
+
+				/* Move to the next s/g segment if possible */
+				sgde = sg_next(sgde);
+
+				sgl++;
+			}
+
+			j++;
+		}
+
+		if (protgroup_offset) {
+			/* update the reference tag */
+			reftag += protgrp_blks;
+			continue;
+		}
+
+		/* are we done ? */
+		if (curr_prot == protcnt) {
+			/* mark the last SGL */
+			sgl--;
+			bf_set(lpfc_sli4_sge_last, sgl, 1);
+			alldone = 1;
+		} else if (curr_prot < protcnt) {
+			/* advance to next prot buffer */
+			sgpe = sg_next(sgpe);
+
+			/* update the reference tag */
+			reftag += protgrp_blks;
+		} else {
+			/* if we're here, we have a bug */
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9085 BLKGRD: bug in %s\n", __func__);
+		}
+
+	} while (!alldone);
+
+out:
+
+	return num_sge;
+}
+
+/**
+ * lpfc_prot_group_type - Get prtotection group type of SCSI command
+ * @phba: The Hba for which this call is being executed.
+ * @sc: pointer to scsi command we're working on
+ *
+ * Given a SCSI command that supports DIF, determine composition of protection
+ * groups involved in setting up buffer lists
+ *
+ * Returns: Protection group type (with or without DIF)
+ *
+ **/
+static int
+lpfc_prot_group_type(struct lpfc_hba *phba, struct scsi_cmnd *sc)
+{
+	int ret = LPFC_PG_TYPE_INVALID;
+	unsigned char op = scsi_get_prot_op(sc);
+
+	switch (op) {
+	case SCSI_PROT_READ_STRIP:
+	case SCSI_PROT_WRITE_INSERT:
+		ret = LPFC_PG_TYPE_NO_DIF;
+		break;
+	case SCSI_PROT_READ_INSERT:
+	case SCSI_PROT_WRITE_STRIP:
+	case SCSI_PROT_READ_PASS:
+	case SCSI_PROT_WRITE_PASS:
+		ret = LPFC_PG_TYPE_DIF_BUF;
+		break;
+	default:
+		if (phba)
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9021 Unsupported protection op:%d\n",
+					op);
+		break;
+	}
+	return ret;
+}
+
+/**
+ * lpfc_bg_scsi_adjust_dl - Adjust SCSI data length for BlockGuard
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be adjusted.
+ *
+ * Adjust the data length to account for how much data
+ * is actually on the wire.
+ *
+ * returns the adjusted data length
+ **/
+static int
+lpfc_bg_scsi_adjust_dl(struct lpfc_hba *phba,
+		       struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scsi_cmnd *sc = lpfc_cmd->pCmd;
+	int fcpdl;
+
+	fcpdl = scsi_bufflen(sc);
+
+	/* Check if there is protection data on the wire */
+	if (sc->sc_data_direction == DMA_FROM_DEVICE) {
+		/* Read check for protection data */
+		if (scsi_get_prot_op(sc) ==  SCSI_PROT_READ_INSERT)
+			return fcpdl;
+
+	} else {
+		/* Write check for protection data */
+		if (scsi_get_prot_op(sc) ==  SCSI_PROT_WRITE_STRIP)
+			return fcpdl;
+	}
+
+	/*
+	 * If we are in DIF Type 1 mode every data block has a 8 byte
+	 * DIF (trailer) attached to it. Must ajust FCP data length
+	 * to account for the protection data.
+	 */
+	fcpdl += (fcpdl / scsi_prot_interval(sc)) * 8;
+
+	return fcpdl;
+}
+
+/**
+ * lpfc_bg_scsi_prep_dma_buf_s3 - DMA mapping for scsi buffer to SLI3 IF spec
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be prep'ed.
+ *
+ * This is the protection/DIF aware version of
+ * lpfc_scsi_prep_dma_buf(). It may be a good idea to combine the
+ * two functions eventually, but for now, it's here.
+ * RETURNS 0 - SUCCESS,
+ *         1 - Failed DMA map, retry.
+ *         2 - Invalid scsi cmd or prot-type. Do not rety.
+ **/
+static int
+lpfc_bg_scsi_prep_dma_buf_s3(struct lpfc_hba *phba,
+		struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct ulp_bde64 *bpl = (struct ulp_bde64 *)lpfc_cmd->dma_sgl;
+	IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
+	uint32_t num_bde = 0;
+	int datasegcnt, protsegcnt, datadir = scsi_cmnd->sc_data_direction;
+	int prot_group_type = 0;
+	int fcpdl;
+	int ret = 1;
+	struct lpfc_vport *vport = phba->pport;
+
+	/*
+	 * Start the lpfc command prep by bumping the bpl beyond fcp_cmnd
+	 *  fcp_rsp regions to the first data bde entry
+	 */
+	bpl += 2;
+	if (scsi_sg_count(scsi_cmnd)) {
+		/*
+		 * The driver stores the segment count returned from dma_map_sg
+		 * because this a count of dma-mappings used to map the use_sg
+		 * pages.  They are not guaranteed to be the same for those
+		 * architectures that implement an IOMMU.
+		 */
+		datasegcnt = dma_map_sg(&phba->pcidev->dev,
+					scsi_sglist(scsi_cmnd),
+					scsi_sg_count(scsi_cmnd), datadir);
+		if (unlikely(!datasegcnt))
+			return 1;
+
+		lpfc_cmd->seg_cnt = datasegcnt;
+
+		/* First check if data segment count from SCSI Layer is good */
+		if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
+			WARN_ON_ONCE(lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt);
+			ret = 2;
+			goto err;
+		}
+
+		prot_group_type = lpfc_prot_group_type(phba, scsi_cmnd);
+
+		switch (prot_group_type) {
+		case LPFC_PG_TYPE_NO_DIF:
+
+			/* Here we need to add a PDE5 and PDE6 to the count */
+			if ((lpfc_cmd->seg_cnt + 2) > phba->cfg_total_seg_cnt) {
+				ret = 2;
+				goto err;
+			}
+
+			num_bde = lpfc_bg_setup_bpl(phba, scsi_cmnd, bpl,
+					datasegcnt);
+			/* we should have 2 or more entries in buffer list */
+			if (num_bde < 2) {
+				ret = 2;
+				goto err;
+			}
+			break;
+
+		case LPFC_PG_TYPE_DIF_BUF:
+			/*
+			 * This type indicates that protection buffers are
+			 * passed to the driver, so that needs to be prepared
+			 * for DMA
+			 */
+			protsegcnt = dma_map_sg(&phba->pcidev->dev,
+					scsi_prot_sglist(scsi_cmnd),
+					scsi_prot_sg_count(scsi_cmnd), datadir);
+			if (unlikely(!protsegcnt)) {
+				scsi_dma_unmap(scsi_cmnd);
+				return 1;
+			}
+
+			lpfc_cmd->prot_seg_cnt = protsegcnt;
+
+			/*
+			 * There is a minimun of 4 BPLs used for every
+			 * protection data segment.
+			 */
+			if ((lpfc_cmd->prot_seg_cnt * 4) >
+			    (phba->cfg_total_seg_cnt - 2)) {
+				ret = 2;
+				goto err;
+			}
+
+			num_bde = lpfc_bg_setup_bpl_prot(phba, scsi_cmnd, bpl,
+					datasegcnt, protsegcnt);
+			/* we should have 3 or more entries in buffer list */
+			if ((num_bde < 3) ||
+			    (num_bde > phba->cfg_total_seg_cnt)) {
+				ret = 2;
+				goto err;
+			}
+			break;
+
+		case LPFC_PG_TYPE_INVALID:
+		default:
+			scsi_dma_unmap(scsi_cmnd);
+			lpfc_cmd->seg_cnt = 0;
+
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9022 Unexpected protection group %i\n",
+					prot_group_type);
+			return 2;
+		}
+	}
+
+	/*
+	 * Finish initializing those IOCB fields that are dependent on the
+	 * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
+	 * reinitialized since all iocb memory resources are used many times
+	 * for transmit, receive, and continuation bpl's.
+	 */
+	iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
+	iocb_cmd->un.fcpi64.bdl.bdeSize += (num_bde * sizeof(struct ulp_bde64));
+	iocb_cmd->ulpBdeCount = 1;
+	iocb_cmd->ulpLe = 1;
+
+	fcpdl = lpfc_bg_scsi_adjust_dl(phba, lpfc_cmd);
+	fcp_cmnd->fcpDl = be32_to_cpu(fcpdl);
+
+	/*
+	 * Due to difference in data length between DIF/non-DIF paths,
+	 * we need to set word 4 of IOCB here
+	 */
+	iocb_cmd->un.fcpi.fcpi_parm = fcpdl;
+
+	/*
+	 * For First burst, we may need to adjust the initial transfer
+	 * length for DIF
+	 */
+	if (iocb_cmd->un.fcpi.fcpi_XRdy &&
+	    (fcpdl < vport->cfg_first_burst_size))
+		iocb_cmd->un.fcpi.fcpi_XRdy = fcpdl;
+
+	return 0;
+err:
+	if (lpfc_cmd->seg_cnt)
+		scsi_dma_unmap(scsi_cmnd);
+	if (lpfc_cmd->prot_seg_cnt)
+		dma_unmap_sg(&phba->pcidev->dev, scsi_prot_sglist(scsi_cmnd),
+			     scsi_prot_sg_count(scsi_cmnd),
+			     scsi_cmnd->sc_data_direction);
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+			"9023 Cannot setup S/G List for HBA"
+			"IO segs %d/%d BPL %d SCSI %d: %d %d\n",
+			lpfc_cmd->seg_cnt, lpfc_cmd->prot_seg_cnt,
+			phba->cfg_total_seg_cnt, phba->cfg_sg_seg_cnt,
+			prot_group_type, num_bde);
+
+	lpfc_cmd->seg_cnt = 0;
+	lpfc_cmd->prot_seg_cnt = 0;
+	return ret;
+}
+
+/*
+ * This function calcuates the T10 DIF guard tag
+ * on the specified data using a CRC algorithmn
+ * using crc_t10dif.
+ */
+static uint16_t
+lpfc_bg_crc(uint8_t *data, int count)
+{
+	uint16_t crc = 0;
+	uint16_t x;
+
+	crc = crc_t10dif(data, count);
+	x = cpu_to_be16(crc);
+	return x;
+}
+
+/*
+ * This function calcuates the T10 DIF guard tag
+ * on the specified data using a CSUM algorithmn
+ * using ip_compute_csum.
+ */
+static uint16_t
+lpfc_bg_csum(uint8_t *data, int count)
+{
+	uint16_t ret;
+
+	ret = ip_compute_csum(data, count);
+	return ret;
+}
+
+/*
+ * This function examines the protection data to try to determine
+ * what type of T10-DIF error occurred.
+ */
+static void
+lpfc_calc_bg_err(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scatterlist *sgpe; /* s/g prot entry */
+	struct scatterlist *sgde; /* s/g data entry */
+	struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
+	struct scsi_dif_tuple *src = NULL;
+	uint8_t *data_src = NULL;
+	uint16_t guard_tag;
+	uint16_t start_app_tag, app_tag;
+	uint32_t start_ref_tag, ref_tag;
+	int prot, protsegcnt;
+	int err_type, len, data_len;
+	int chk_ref, chk_app, chk_guard;
+	uint16_t sum;
+	unsigned blksize;
+
+	err_type = BGS_GUARD_ERR_MASK;
+	sum = 0;
+	guard_tag = 0;
+
+	/* First check to see if there is protection data to examine */
+	prot = scsi_get_prot_op(cmd);
+	if ((prot == SCSI_PROT_READ_STRIP) ||
+	    (prot == SCSI_PROT_WRITE_INSERT) ||
+	    (prot == SCSI_PROT_NORMAL))
+		goto out;
+
+	/* Currently the driver just supports ref_tag and guard_tag checking */
+	chk_ref = 1;
+	chk_app = 0;
+	chk_guard = 0;
+
+	/* Setup a ptr to the protection data provided by the SCSI host */
+	sgpe = scsi_prot_sglist(cmd);
+	protsegcnt = lpfc_cmd->prot_seg_cnt;
+
+	if (sgpe && protsegcnt) {
+
+		/*
+		 * We will only try to verify guard tag if the segment
+		 * data length is a multiple of the blksize.
+		 */
+		sgde = scsi_sglist(cmd);
+		blksize = scsi_prot_interval(cmd);
+		data_src = (uint8_t *)sg_virt(sgde);
+		data_len = sgde->length;
+		if ((data_len & (blksize - 1)) == 0)
+			chk_guard = 1;
+
+		src = (struct scsi_dif_tuple *)sg_virt(sgpe);
+		start_ref_tag = scsi_prot_ref_tag(cmd);
+		start_app_tag = src->app_tag;
+		len = sgpe->length;
+		while (src && protsegcnt) {
+			while (len) {
+
+				/*
+				 * First check to see if a protection data
+				 * check is valid
+				 */
+				if ((src->ref_tag == T10_PI_REF_ESCAPE) ||
+				    (src->app_tag == T10_PI_APP_ESCAPE)) {
+					start_ref_tag++;
+					goto skipit;
+				}
+
+				/* First Guard Tag checking */
+				if (chk_guard) {
+					guard_tag = src->guard_tag;
+					if (cmd->prot_flags
+					    & SCSI_PROT_IP_CHECKSUM)
+						sum = lpfc_bg_csum(data_src,
+								   blksize);
+					else
+						sum = lpfc_bg_crc(data_src,
+								  blksize);
+					if ((guard_tag != sum)) {
+						err_type = BGS_GUARD_ERR_MASK;
+						goto out;
+					}
+				}
+
+				/* Reference Tag checking */
+				ref_tag = be32_to_cpu(src->ref_tag);
+				if (chk_ref && (ref_tag != start_ref_tag)) {
+					err_type = BGS_REFTAG_ERR_MASK;
+					goto out;
+				}
+				start_ref_tag++;
+
+				/* App Tag checking */
+				app_tag = src->app_tag;
+				if (chk_app && (app_tag != start_app_tag)) {
+					err_type = BGS_APPTAG_ERR_MASK;
+					goto out;
+				}
+skipit:
+				len -= sizeof(struct scsi_dif_tuple);
+				if (len < 0)
+					len = 0;
+				src++;
+
+				data_src += blksize;
+				data_len -= blksize;
+
+				/*
+				 * Are we at the end of the Data segment?
+				 * The data segment is only used for Guard
+				 * tag checking.
+				 */
+				if (chk_guard && (data_len == 0)) {
+					chk_guard = 0;
+					sgde = sg_next(sgde);
+					if (!sgde)
+						goto out;
+
+					data_src = (uint8_t *)sg_virt(sgde);
+					data_len = sgde->length;
+					if ((data_len & (blksize - 1)) == 0)
+						chk_guard = 1;
+				}
+			}
+
+			/* Goto the next Protection data segment */
+			sgpe = sg_next(sgpe);
+			if (sgpe) {
+				src = (struct scsi_dif_tuple *)sg_virt(sgpe);
+				len = sgpe->length;
+			} else {
+				src = NULL;
+			}
+			protsegcnt--;
+		}
+	}
+out:
+	if (err_type == BGS_GUARD_ERR_MASK) {
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x1);
+		set_host_byte(cmd, DID_ABORT);
+		phba->bg_guard_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9069 BLKGRD: reftag %x grd_tag err %x != %x\n",
+				scsi_prot_ref_tag(cmd),
+				sum, guard_tag);
+
+	} else if (err_type == BGS_REFTAG_ERR_MASK) {
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x3);
+		set_host_byte(cmd, DID_ABORT);
+
+		phba->bg_reftag_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9066 BLKGRD: reftag %x ref_tag err %x != %x\n",
+				scsi_prot_ref_tag(cmd),
+				ref_tag, start_ref_tag);
+
+	} else if (err_type == BGS_APPTAG_ERR_MASK) {
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x2);
+		set_host_byte(cmd, DID_ABORT);
+
+		phba->bg_apptag_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9041 BLKGRD: reftag %x app_tag err %x != %x\n",
+				scsi_prot_ref_tag(cmd),
+				app_tag, start_app_tag);
+	}
+}
+
+/*
+ * This function checks for BlockGuard errors detected by
+ * the HBA.  In case of errors, the ASC/ASCQ fields in the
+ * sense buffer will be set accordingly, paired with
+ * ILLEGAL_REQUEST to signal to the kernel that the HBA
+ * detected corruption.
+ *
+ * Returns:
+ *  0 - No error found
+ *  1 - BlockGuard error found
+ * -1 - Internal error (bad profile, ...etc)
+ */
+static int
+lpfc_parse_bg_err(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd,
+		  struct lpfc_iocbq *pIocbOut)
+{
+	struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
+	struct sli3_bg_fields *bgf;
+	int ret = 0;
+	struct lpfc_wcqe_complete *wcqe;
+	u32 status;
+	u32 bghm = 0;
+	u32 bgstat = 0;
+	u64 failing_sector = 0;
+
+	if (phba->sli_rev == LPFC_SLI_REV4) {
+		wcqe = &pIocbOut->wcqe_cmpl;
+		status = bf_get(lpfc_wcqe_c_status, wcqe);
+
+		if (status == CQE_STATUS_DI_ERROR) {
+			/* Guard Check failed */
+			if (bf_get(lpfc_wcqe_c_bg_ge, wcqe))
+				bgstat |= BGS_GUARD_ERR_MASK;
+
+			/* AppTag Check failed */
+			if (bf_get(lpfc_wcqe_c_bg_ae, wcqe))
+				bgstat |= BGS_APPTAG_ERR_MASK;
+
+			/* RefTag Check failed */
+			if (bf_get(lpfc_wcqe_c_bg_re, wcqe))
+				bgstat |= BGS_REFTAG_ERR_MASK;
+
+			/* Check to see if there was any good data before the
+			 * error
+			 */
+			if (bf_get(lpfc_wcqe_c_bg_tdpv, wcqe)) {
+				bgstat |= BGS_HI_WATER_MARK_PRESENT_MASK;
+				bghm = wcqe->total_data_placed;
+			}
+
+			/*
+			 * Set ALL the error bits to indicate we don't know what
+			 * type of error it is.
+			 */
+			if (!bgstat)
+				bgstat |= (BGS_REFTAG_ERR_MASK |
+					   BGS_APPTAG_ERR_MASK |
+					   BGS_GUARD_ERR_MASK);
+		}
+
+	} else {
+		bgf = &pIocbOut->iocb.unsli3.sli3_bg;
+		bghm = bgf->bghm;
+		bgstat = bgf->bgstat;
+	}
+
+	if (lpfc_bgs_get_invalid_prof(bgstat)) {
+		cmd->result = DID_ERROR << 16;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9072 BLKGRD: Invalid BG Profile in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+		ret = (-1);
+		goto out;
+	}
+
+	if (lpfc_bgs_get_uninit_dif_block(bgstat)) {
+		cmd->result = DID_ERROR << 16;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9073 BLKGRD: Invalid BG PDIF Block in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+		ret = (-1);
+		goto out;
+	}
+
+	if (lpfc_bgs_get_guard_err(bgstat)) {
+		ret = 1;
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x1);
+		set_host_byte(cmd, DID_ABORT);
+		phba->bg_guard_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9055 BLKGRD: Guard Tag error in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+	}
+
+	if (lpfc_bgs_get_reftag_err(bgstat)) {
+		ret = 1;
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x3);
+		set_host_byte(cmd, DID_ABORT);
+		phba->bg_reftag_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9056 BLKGRD: Ref Tag error in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+	}
+
+	if (lpfc_bgs_get_apptag_err(bgstat)) {
+		ret = 1;
+		scsi_build_sense(cmd, 1, ILLEGAL_REQUEST, 0x10, 0x2);
+		set_host_byte(cmd, DID_ABORT);
+		phba->bg_apptag_err_cnt++;
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9061 BLKGRD: App Tag error in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+	}
+
+	if (lpfc_bgs_get_hi_water_mark_present(bgstat)) {
+		/*
+		 * setup sense data descriptor 0 per SPC-4 as an information
+		 * field, and put the failing LBA in it.
+		 * This code assumes there was also a guard/app/ref tag error
+		 * indication.
+		 */
+		cmd->sense_buffer[7] = 0xc;   /* Additional sense length */
+		cmd->sense_buffer[8] = 0;     /* Information descriptor type */
+		cmd->sense_buffer[9] = 0xa;   /* Additional descriptor length */
+		cmd->sense_buffer[10] = 0x80; /* Validity bit */
+
+		/* bghm is a "on the wire" FC frame based count */
+		switch (scsi_get_prot_op(cmd)) {
+		case SCSI_PROT_READ_INSERT:
+		case SCSI_PROT_WRITE_STRIP:
+			bghm /= cmd->device->sector_size;
+			break;
+		case SCSI_PROT_READ_STRIP:
+		case SCSI_PROT_WRITE_INSERT:
+		case SCSI_PROT_READ_PASS:
+		case SCSI_PROT_WRITE_PASS:
+			bghm /= (cmd->device->sector_size +
+				sizeof(struct scsi_dif_tuple));
+			break;
+		}
+
+		failing_sector = scsi_get_lba(cmd);
+		failing_sector += bghm;
+
+		/* Descriptor Information */
+		put_unaligned_be64(failing_sector, &cmd->sense_buffer[12]);
+	}
+
+	if (!ret) {
+		/* No error was reported - problem in FW? */
+		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_BG,
+				"9057 BLKGRD: Unknown error in cmd "
+				"0x%x reftag 0x%x blk cnt 0x%x "
+				"bgstat=x%x bghm=x%x\n", cmd->cmnd[0],
+				scsi_prot_ref_tag(cmd),
+				scsi_logical_block_count(cmd), bgstat, bghm);
+
+		/* Calculate what type of error it was */
+		lpfc_calc_bg_err(phba, lpfc_cmd);
+	}
+out:
+	return ret;
+}
+
+/**
+ * lpfc_scsi_prep_dma_buf_s4 - DMA mapping for scsi buffer to SLI4 IF spec
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This routine does the pci dma mapping for scatter-gather list of scsi cmnd
+ * field of @lpfc_cmd for device with SLI-4 interface spec.
+ *
+ * Return codes:
+ *	2 - Error - Do not retry
+ *	1 - Error - Retry
+ *	0 - Success
+ **/
+static int
+lpfc_scsi_prep_dma_buf_s4(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct scatterlist *sgel = NULL;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct sli4_sge *sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
+	struct sli4_sge *first_data_sgl;
+	struct lpfc_iocbq *pwqeq = &lpfc_cmd->cur_iocbq;
+	struct lpfc_vport *vport = phba->pport;
+	union lpfc_wqe128 *wqe = &pwqeq->wqe;
+	dma_addr_t physaddr;
+	uint32_t dma_len;
+	uint32_t dma_offset = 0;
+	int nseg, i, j;
+	struct ulp_bde64 *bde;
+	bool lsp_just_set = false;
+	struct sli4_hybrid_sgl *sgl_xtra = NULL;
+
+	/*
+	 * There are three possibilities here - use scatter-gather segment, use
+	 * the single mapping, or neither.  Start the lpfc command prep by
+	 * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
+	 * data bde entry.
+	 */
+	if (scsi_sg_count(scsi_cmnd)) {
+		/*
+		 * The driver stores the segment count returned from dma_map_sg
+		 * because this a count of dma-mappings used to map the use_sg
+		 * pages.  They are not guaranteed to be the same for those
+		 * architectures that implement an IOMMU.
+		 */
+
+		nseg = scsi_dma_map(scsi_cmnd);
+		if (unlikely(nseg <= 0))
+			return 1;
+		sgl += 1;
+		/* clear the last flag in the fcp_rsp map entry */
+		sgl->word2 = le32_to_cpu(sgl->word2);
+		bf_set(lpfc_sli4_sge_last, sgl, 0);
+		sgl->word2 = cpu_to_le32(sgl->word2);
+		sgl += 1;
+		first_data_sgl = sgl;
+		lpfc_cmd->seg_cnt = nseg;
+		if (!phba->cfg_xpsgl &&
+		    lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9074 BLKGRD:"
+					" %s: Too many sg segments from "
+					"dma_map_sg.  Config %d, seg_cnt %d\n",
+					__func__, phba->cfg_sg_seg_cnt,
+					lpfc_cmd->seg_cnt);
+			WARN_ON_ONCE(lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt);
+			lpfc_cmd->seg_cnt = 0;
+			scsi_dma_unmap(scsi_cmnd);
+			return 2;
+		}
+
+		/*
+		 * The driver established a maximum scatter-gather segment count
+		 * during probe that limits the number of sg elements in any
+		 * single scsi command.  Just run through the seg_cnt and format
+		 * the sge's.
+		 * When using SLI-3 the driver will try to fit all the BDEs into
+		 * the IOCB. If it can't then the BDEs get added to a BPL as it
+		 * does for SLI-2 mode.
+		 */
+
+		/* for tracking segment boundaries */
+		sgel = scsi_sglist(scsi_cmnd);
+		j = 2;
+		for (i = 0; i < nseg; i++) {
+			sgl->word2 = 0;
+			if (nseg == 1) {
+				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);
+
+				/* do we need to 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_cmd);
+
+					if (unlikely(!sgl_xtra)) {
+						lpfc_cmd->seg_cnt = 0;
+						scsi_dma_unmap(scsi_cmnd);
+						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 = sg_dma_address(sgel);
+				dma_len = sg_dma_len(sgel);
+				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;
+				sgel = sg_next(sgel);
+
+				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++;
+		}
+
+		/* PBDE support for first data SGE only.
+		 * For FCoE, we key off Performance Hints.
+		 * For FC, we key off lpfc_enable_pbde.
+		 */
+		if (nseg == 1 &&
+		    ((phba->sli3_options & LPFC_SLI4_PERFH_ENABLED) ||
+		     phba->cfg_enable_pbde)) {
+			/* 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 - set PBDE bit */
+			bf_set(wqe_pbde, &wqe->generic.wqe_com, 1);
+		} else {
+			memset(&wqe->words[13], 0, (sizeof(uint32_t) * 3));
+			/* Word 11 - PBDE bit disabled by default template */
+		}
+	} else {
+		sgl += 1;
+		/* set the last flag in the fcp_rsp map entry */
+		sgl->word2 = le32_to_cpu(sgl->word2);
+		bf_set(lpfc_sli4_sge_last, sgl, 1);
+		sgl->word2 = cpu_to_le32(sgl->word2);
+
+		if ((phba->sli3_options & LPFC_SLI4_PERFH_ENABLED) ||
+		    phba->cfg_enable_pbde) {
+			bde = (struct ulp_bde64 *)
+				&wqe->words[13];
+			memset(bde, 0, (sizeof(uint32_t) * 3));
+		}
+	}
+
+	/*
+	 * Finish initializing those IOCB fields that are dependent on the
+	 * scsi_cmnd request_buffer.  Note that for SLI-2 the bdeSize is
+	 * explicitly reinitialized.
+	 * all iocb memory resources are reused.
+	 */
+	fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
+	/* Set first-burst provided it was successfully negotiated */
+	if (!(phba->hba_flag & HBA_FCOE_MODE) &&
+	    vport->cfg_first_burst_size &&
+	    scsi_cmnd->sc_data_direction == DMA_TO_DEVICE) {
+		u32 init_len, total_len;
+
+		total_len = be32_to_cpu(fcp_cmnd->fcpDl);
+		init_len = min(total_len, vport->cfg_first_burst_size);
+
+		/* Word 4 & 5 */
+		wqe->fcp_iwrite.initial_xfer_len = init_len;
+		wqe->fcp_iwrite.total_xfer_len = total_len;
+	} else {
+		/* Word 4 */
+		wqe->fcp_iwrite.total_xfer_len =
+			be32_to_cpu(fcp_cmnd->fcpDl);
+	}
+
+	/*
+	 * If the OAS driver feature is enabled and the lun is enabled for
+	 * OAS, set the oas iocb related flags.
+	 */
+	if ((phba->cfg_fof) && ((struct lpfc_device_data *)
+		scsi_cmnd->device->hostdata)->oas_enabled) {
+		lpfc_cmd->cur_iocbq.cmd_flag |= (LPFC_IO_OAS | LPFC_IO_FOF);
+		lpfc_cmd->cur_iocbq.priority = ((struct lpfc_device_data *)
+			scsi_cmnd->device->hostdata)->priority;
+
+		/* Word 10 */
+		bf_set(wqe_oas, &wqe->generic.wqe_com, 1);
+		bf_set(wqe_ccpe, &wqe->generic.wqe_com, 1);
+
+		if (lpfc_cmd->cur_iocbq.priority)
+			bf_set(wqe_ccp, &wqe->generic.wqe_com,
+			       (lpfc_cmd->cur_iocbq.priority << 1));
+		else
+			bf_set(wqe_ccp, &wqe->generic.wqe_com,
+			       (phba->cfg_XLanePriority << 1));
+	}
+
+	return 0;
+}
+
+/**
+ * lpfc_bg_scsi_prep_dma_buf_s4 - DMA mapping for scsi buffer to SLI4 IF spec
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This is the protection/DIF aware version of
+ * lpfc_scsi_prep_dma_buf(). It may be a good idea to combine the
+ * two functions eventually, but for now, it's here
+ * Return codes:
+ *	2 - Error - Do not retry
+ *	1 - Error - Retry
+ *	0 - Success
+ **/
+static int
+lpfc_bg_scsi_prep_dma_buf_s4(struct lpfc_hba *phba,
+		struct lpfc_io_buf *lpfc_cmd)
+{
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct sli4_sge *sgl = (struct sli4_sge *)(lpfc_cmd->dma_sgl);
+	struct lpfc_iocbq *pwqeq = &lpfc_cmd->cur_iocbq;
+	union lpfc_wqe128 *wqe = &pwqeq->wqe;
+	uint32_t num_sge = 0;
+	int datasegcnt, protsegcnt, datadir = scsi_cmnd->sc_data_direction;
+	int prot_group_type = 0;
+	int fcpdl;
+	int ret = 1;
+	struct lpfc_vport *vport = phba->pport;
+
+	/*
+	 * Start the lpfc command prep by bumping the sgl beyond fcp_cmnd
+	 *  fcp_rsp regions to the first data sge entry
+	 */
+	if (scsi_sg_count(scsi_cmnd)) {
+		/*
+		 * The driver stores the segment count returned from dma_map_sg
+		 * because this a count of dma-mappings used to map the use_sg
+		 * pages.  They are not guaranteed to be the same for those
+		 * architectures that implement an IOMMU.
+		 */
+		datasegcnt = dma_map_sg(&phba->pcidev->dev,
+					scsi_sglist(scsi_cmnd),
+					scsi_sg_count(scsi_cmnd), datadir);
+		if (unlikely(!datasegcnt))
+			return 1;
+
+		sgl += 1;
+		/* clear the last flag in the fcp_rsp map entry */
+		sgl->word2 = le32_to_cpu(sgl->word2);
+		bf_set(lpfc_sli4_sge_last, sgl, 0);
+		sgl->word2 = cpu_to_le32(sgl->word2);
+
+		sgl += 1;
+		lpfc_cmd->seg_cnt = datasegcnt;
+
+		/* First check if data segment count from SCSI Layer is good */
+		if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt &&
+		    !phba->cfg_xpsgl) {
+			WARN_ON_ONCE(lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt);
+			ret = 2;
+			goto err;
+		}
+
+		prot_group_type = lpfc_prot_group_type(phba, scsi_cmnd);
+
+		switch (prot_group_type) {
+		case LPFC_PG_TYPE_NO_DIF:
+			/* Here we need to add a DISEED to the count */
+			if (((lpfc_cmd->seg_cnt + 1) >
+					phba->cfg_total_seg_cnt) &&
+			    !phba->cfg_xpsgl) {
+				ret = 2;
+				goto err;
+			}
+
+			num_sge = lpfc_bg_setup_sgl(phba, scsi_cmnd, sgl,
+					datasegcnt, lpfc_cmd);
+
+			/* we should have 2 or more entries in buffer list */
+			if (num_sge < 2) {
+				ret = 2;
+				goto err;
+			}
+			break;
+
+		case LPFC_PG_TYPE_DIF_BUF:
+			/*
+			 * This type indicates that protection buffers are
+			 * passed to the driver, so that needs to be prepared
+			 * for DMA
+			 */
+			protsegcnt = dma_map_sg(&phba->pcidev->dev,
+					scsi_prot_sglist(scsi_cmnd),
+					scsi_prot_sg_count(scsi_cmnd), datadir);
+			if (unlikely(!protsegcnt)) {
+				scsi_dma_unmap(scsi_cmnd);
+				return 1;
+			}
+
+			lpfc_cmd->prot_seg_cnt = protsegcnt;
+			/*
+			 * There is a minimun of 3 SGEs used for every
+			 * protection data segment.
+			 */
+			if (((lpfc_cmd->prot_seg_cnt * 3) >
+					(phba->cfg_total_seg_cnt - 2)) &&
+			    !phba->cfg_xpsgl) {
+				ret = 2;
+				goto err;
+			}
+
+			num_sge = lpfc_bg_setup_sgl_prot(phba, scsi_cmnd, sgl,
+					datasegcnt, protsegcnt, lpfc_cmd);
+
+			/* we should have 3 or more entries in buffer list */
+			if (num_sge < 3 ||
+			    (num_sge > phba->cfg_total_seg_cnt &&
+			     !phba->cfg_xpsgl)) {
+				ret = 2;
+				goto err;
+			}
+			break;
+
+		case LPFC_PG_TYPE_INVALID:
+		default:
+			scsi_dma_unmap(scsi_cmnd);
+			lpfc_cmd->seg_cnt = 0;
+
+			lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+					"9083 Unexpected protection group %i\n",
+					prot_group_type);
+			return 2;
+		}
+	}
+
+	switch (scsi_get_prot_op(scsi_cmnd)) {
+	case SCSI_PROT_WRITE_STRIP:
+	case SCSI_PROT_READ_STRIP:
+		lpfc_cmd->cur_iocbq.cmd_flag |= LPFC_IO_DIF_STRIP;
+		break;
+	case SCSI_PROT_WRITE_INSERT:
+	case SCSI_PROT_READ_INSERT:
+		lpfc_cmd->cur_iocbq.cmd_flag |= LPFC_IO_DIF_INSERT;
+		break;
+	case SCSI_PROT_WRITE_PASS:
+	case SCSI_PROT_READ_PASS:
+		lpfc_cmd->cur_iocbq.cmd_flag |= LPFC_IO_DIF_PASS;
+		break;
+	}
+
+	fcpdl = lpfc_bg_scsi_adjust_dl(phba, lpfc_cmd);
+	fcp_cmnd->fcpDl = be32_to_cpu(fcpdl);
+
+	/* Set first-burst provided it was successfully negotiated */
+	if (!(phba->hba_flag & HBA_FCOE_MODE) &&
+	    vport->cfg_first_burst_size &&
+	    scsi_cmnd->sc_data_direction == DMA_TO_DEVICE) {
+		u32 init_len, total_len;
+
+		total_len = be32_to_cpu(fcp_cmnd->fcpDl);
+		init_len = min(total_len, vport->cfg_first_burst_size);
+
+		/* Word 4 & 5 */
+		wqe->fcp_iwrite.initial_xfer_len = init_len;
+		wqe->fcp_iwrite.total_xfer_len = total_len;
+	} else {
+		/* Word 4 */
+		wqe->fcp_iwrite.total_xfer_len =
+			be32_to_cpu(fcp_cmnd->fcpDl);
+	}
+
+	/*
+	 * If the OAS driver feature is enabled and the lun is enabled for
+	 * OAS, set the oas iocb related flags.
+	 */
+	if ((phba->cfg_fof) && ((struct lpfc_device_data *)
+		scsi_cmnd->device->hostdata)->oas_enabled) {
+		lpfc_cmd->cur_iocbq.cmd_flag |= (LPFC_IO_OAS | LPFC_IO_FOF);
+
+		/* Word 10 */
+		bf_set(wqe_oas, &wqe->generic.wqe_com, 1);
+		bf_set(wqe_ccpe, &wqe->generic.wqe_com, 1);
+		bf_set(wqe_ccp, &wqe->generic.wqe_com,
+		       (phba->cfg_XLanePriority << 1));
+	}
+
+	/* Word 7. DIF Flags */
+	if (lpfc_cmd->cur_iocbq.cmd_flag & LPFC_IO_DIF_PASS)
+		bf_set(wqe_dif, &wqe->generic.wqe_com, LPFC_WQE_DIF_PASSTHRU);
+	else if (lpfc_cmd->cur_iocbq.cmd_flag & LPFC_IO_DIF_STRIP)
+		bf_set(wqe_dif, &wqe->generic.wqe_com, LPFC_WQE_DIF_STRIP);
+	else if (lpfc_cmd->cur_iocbq.cmd_flag & LPFC_IO_DIF_INSERT)
+		bf_set(wqe_dif, &wqe->generic.wqe_com, LPFC_WQE_DIF_INSERT);
+
+	lpfc_cmd->cur_iocbq.cmd_flag &= ~(LPFC_IO_DIF_PASS |
+				 LPFC_IO_DIF_STRIP | LPFC_IO_DIF_INSERT);
+
+	return 0;
+err:
+	if (lpfc_cmd->seg_cnt)
+		scsi_dma_unmap(scsi_cmnd);
+	if (lpfc_cmd->prot_seg_cnt)
+		dma_unmap_sg(&phba->pcidev->dev, scsi_prot_sglist(scsi_cmnd),
+			     scsi_prot_sg_count(scsi_cmnd),
+			     scsi_cmnd->sc_data_direction);
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+			"9084 Cannot setup S/G List for HBA "
+			"IO segs %d/%d SGL %d SCSI %d: %d %d %d\n",
+			lpfc_cmd->seg_cnt, lpfc_cmd->prot_seg_cnt,
+			phba->cfg_total_seg_cnt, phba->cfg_sg_seg_cnt,
+			prot_group_type, num_sge, ret);
+
+	lpfc_cmd->seg_cnt = 0;
+	lpfc_cmd->prot_seg_cnt = 0;
+	return ret;
+}
+
+/**
+ * lpfc_scsi_prep_dma_buf - Wrapper function for DMA mapping of scsi buffer
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This routine wraps the actual DMA mapping function pointer from the
+ * lpfc_hba struct.
+ *
+ * Return codes:
+ *	1 - Error
+ *	0 - Success
+ **/
+static inline int
+lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
+{
+	return phba->lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
+}
+
+/**
+ * lpfc_bg_scsi_prep_dma_buf - Wrapper function for DMA mapping of scsi buffer
+ * using BlockGuard.
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This routine wraps the actual DMA mapping function pointer from the
+ * lpfc_hba struct.
+ *
+ * Return codes:
+ *	1 - Error
+ *	0 - Success
+ **/
+static inline int
+lpfc_bg_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
+{
+	return phba->lpfc_bg_scsi_prep_dma_buf(phba, lpfc_cmd);
+}
+
+/**
+ * lpfc_scsi_prep_cmnd_buf - Wrapper function for IOCB/WQE mapping of scsi
+ * buffer
+ * @vport: Pointer to vport object.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ * @tmo: Timeout value for IO
+ *
+ * This routine initializes IOCB/WQE data structure from scsi command
+ *
+ * Return codes:
+ *	1 - Error
+ *	0 - Success
+ **/
+static inline int
+lpfc_scsi_prep_cmnd_buf(struct lpfc_vport *vport, struct lpfc_io_buf *lpfc_cmd,
+			uint8_t tmo)
+{
+	return vport->phba->lpfc_scsi_prep_cmnd_buf(vport, lpfc_cmd, tmo);
+}
+
+/**
+ * lpfc_send_scsi_error_event - Posts an event when there is SCSI error
+ * @phba: Pointer to hba context object.
+ * @vport: Pointer to vport object.
+ * @lpfc_cmd: Pointer to lpfc scsi command which reported the error.
+ * @fcpi_parm: FCP Initiator parameter.
+ *
+ * This function posts an event when there is a SCSI command reporting
+ * error from the scsi device.
+ **/
+static void
+lpfc_send_scsi_error_event(struct lpfc_hba *phba, struct lpfc_vport *vport,
+		struct lpfc_io_buf *lpfc_cmd, uint32_t fcpi_parm) {
+	struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
+	struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
+	uint32_t resp_info = fcprsp->rspStatus2;
+	uint32_t scsi_status = fcprsp->rspStatus3;
+	struct lpfc_fast_path_event *fast_path_evt = NULL;
+	struct lpfc_nodelist *pnode = lpfc_cmd->rdata->pnode;
+	unsigned long flags;
+
+	if (!pnode)
+		return;
+
+	/* If there is queuefull or busy condition send a scsi event */
+	if ((cmnd->result == SAM_STAT_TASK_SET_FULL) ||
+		(cmnd->result == SAM_STAT_BUSY)) {
+		fast_path_evt = lpfc_alloc_fast_evt(phba);
+		if (!fast_path_evt)
+			return;
+		fast_path_evt->un.scsi_evt.event_type =
+			FC_REG_SCSI_EVENT;
+		fast_path_evt->un.scsi_evt.subcategory =
+		(cmnd->result == SAM_STAT_TASK_SET_FULL) ?
+		LPFC_EVENT_QFULL : LPFC_EVENT_DEVBSY;
+		fast_path_evt->un.scsi_evt.lun = cmnd->device->lun;
+		memcpy(&fast_path_evt->un.scsi_evt.wwpn,
+			&pnode->nlp_portname, sizeof(struct lpfc_name));
+		memcpy(&fast_path_evt->un.scsi_evt.wwnn,
+			&pnode->nlp_nodename, sizeof(struct lpfc_name));
+	} else if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen &&
+		((cmnd->cmnd[0] == READ_10) || (cmnd->cmnd[0] == WRITE_10))) {
+		fast_path_evt = lpfc_alloc_fast_evt(phba);
+		if (!fast_path_evt)
+			return;
+		fast_path_evt->un.check_cond_evt.scsi_event.event_type =
+			FC_REG_SCSI_EVENT;
+		fast_path_evt->un.check_cond_evt.scsi_event.subcategory =
+			LPFC_EVENT_CHECK_COND;
+		fast_path_evt->un.check_cond_evt.scsi_event.lun =
+			cmnd->device->lun;
+		memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwpn,
+			&pnode->nlp_portname, sizeof(struct lpfc_name));
+		memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwnn,
+			&pnode->nlp_nodename, sizeof(struct lpfc_name));
+		fast_path_evt->un.check_cond_evt.sense_key =
+			cmnd->sense_buffer[2] & 0xf;
+		fast_path_evt->un.check_cond_evt.asc = cmnd->sense_buffer[12];
+		fast_path_evt->un.check_cond_evt.ascq = cmnd->sense_buffer[13];
+	} else if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
+		     fcpi_parm &&
+		     ((be32_to_cpu(fcprsp->rspResId) != fcpi_parm) ||
+			((scsi_status == SAM_STAT_GOOD) &&
+			!(resp_info & (RESID_UNDER | RESID_OVER))))) {
+		/*
+		 * If status is good or resid does not match with fcp_param and
+		 * there is valid fcpi_parm, then there is a read_check error
+		 */
+		fast_path_evt = lpfc_alloc_fast_evt(phba);
+		if (!fast_path_evt)
+			return;
+		fast_path_evt->un.read_check_error.header.event_type =
+			FC_REG_FABRIC_EVENT;
+		fast_path_evt->un.read_check_error.header.subcategory =
+			LPFC_EVENT_FCPRDCHKERR;
+		memcpy(&fast_path_evt->un.read_check_error.header.wwpn,
+			&pnode->nlp_portname, sizeof(struct lpfc_name));
+		memcpy(&fast_path_evt->un.read_check_error.header.wwnn,
+			&pnode->nlp_nodename, sizeof(struct lpfc_name));
+		fast_path_evt->un.read_check_error.lun = cmnd->device->lun;
+		fast_path_evt->un.read_check_error.opcode = cmnd->cmnd[0];
+		fast_path_evt->un.read_check_error.fcpiparam =
+			fcpi_parm;
+	} else
+		return;
+
+	fast_path_evt->vport = vport;
+	spin_lock_irqsave(&phba->hbalock, flags);
+	list_add_tail(&fast_path_evt->work_evt.evt_listp, &phba->work_list);
+	spin_unlock_irqrestore(&phba->hbalock, flags);
+	lpfc_worker_wake_up(phba);
+	return;
+}
+
+/**
+ * lpfc_scsi_unprep_dma_buf - Un-map DMA mapping of SG-list for dev
+ * @phba: The HBA for which this call is being executed.
+ * @psb: The scsi buffer which is going to be un-mapped.
+ *
+ * This routine does DMA un-mapping of scatter gather list of scsi command
+ * field of @lpfc_cmd for device with SLI-3 interface spec.
+ **/
+static void
+lpfc_scsi_unprep_dma_buf(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
+{
+	/*
+	 * There are only two special cases to consider.  (1) the scsi command
+	 * requested scatter-gather usage or (2) the scsi command allocated
+	 * a request buffer, but did not request use_sg.  There is a third
+	 * case, but it does not require resource deallocation.
+	 */
+	if (psb->seg_cnt > 0)
+		scsi_dma_unmap(psb->pCmd);
+	if (psb->prot_seg_cnt > 0)
+		dma_unmap_sg(&phba->pcidev->dev, scsi_prot_sglist(psb->pCmd),
+				scsi_prot_sg_count(psb->pCmd),
+				psb->pCmd->sc_data_direction);
+}
+
+/**
+ * lpfc_unblock_requests - allow further commands to be queued.
+ * @phba: pointer to phba object
+ *
+ * For single vport, just call scsi_unblock_requests on physical port.
+ * For multiple vports, send scsi_unblock_requests for all the vports.
+ */
+void
+lpfc_unblock_requests(struct lpfc_hba *phba)
+{
+	struct lpfc_vport **vports;
+	struct Scsi_Host  *shost;
+	int i;
+
+	if (phba->sli_rev == LPFC_SLI_REV4 &&
+	    !phba->sli4_hba.max_cfg_param.vpi_used) {
+		shost = lpfc_shost_from_vport(phba->pport);
+		scsi_unblock_requests(shost);
+		return;
+	}
+
+	vports = lpfc_create_vport_work_array(phba);
+	if (vports != NULL)
+		for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
+			shost = lpfc_shost_from_vport(vports[i]);
+			scsi_unblock_requests(shost);
+		}
+	lpfc_destroy_vport_work_array(phba, vports);
+}
+
+/**
+ * lpfc_block_requests - prevent further commands from being queued.
+ * @phba: pointer to phba object
+ *
+ * For single vport, just call scsi_block_requests on physical port.
+ * For multiple vports, send scsi_block_requests for all the vports.
+ */
+void
+lpfc_block_requests(struct lpfc_hba *phba)
+{
+	struct lpfc_vport **vports;
+	struct Scsi_Host  *shost;
+	int i;
+
+	if (atomic_read(&phba->cmf_stop_io))
+		return;
+
+	if (phba->sli_rev == LPFC_SLI_REV4 &&
+	    !phba->sli4_hba.max_cfg_param.vpi_used) {
+		shost = lpfc_shost_from_vport(phba->pport);
+		scsi_block_requests(shost);
+		return;
+	}
+
+	vports = lpfc_create_vport_work_array(phba);
+	if (vports != NULL)
+		for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
+			shost = lpfc_shost_from_vport(vports[i]);
+			scsi_block_requests(shost);
+		}
+	lpfc_destroy_vport_work_array(phba, vports);
+}
+
+/**
+ * lpfc_update_cmf_cmpl - Adjust CMF counters for IO completion
+ * @phba: The HBA for which this call is being executed.
+ * @time: The latency of the IO that completed (in ns)
+ * @size: The size of the IO that completed
+ * @shost: SCSI host the IO completed on (NULL for a NVME IO)
+ *
+ * The routine adjusts the various Burst and Bandwidth counters used in
+ * Congestion management and E2E. If time is set to LPFC_CGN_NOT_SENT,
+ * that means the IO was never issued to the HBA, so this routine is
+ * just being called to cleanup the counter from a previous
+ * lpfc_update_cmf_cmd call.
+ */
+int
+lpfc_update_cmf_cmpl(struct lpfc_hba *phba,
+		     uint64_t time, uint32_t size, struct Scsi_Host *shost)
+{
+	struct lpfc_cgn_stat *cgs;
+
+	if (time != LPFC_CGN_NOT_SENT) {
+		/* lat is ns coming in, save latency in us */
+		if (time < 1000)
+			time = 1;
+		else
+			time = div_u64(time + 500, 1000); /* round it */
+
+		cgs = per_cpu_ptr(phba->cmf_stat, raw_smp_processor_id());
+		atomic64_add(size, &cgs->rcv_bytes);
+		atomic64_add(time, &cgs->rx_latency);
+		atomic_inc(&cgs->rx_io_cnt);
+	}
+	return 0;
+}
+
+/**
+ * lpfc_update_cmf_cmd - Adjust CMF counters for IO submission
+ * @phba: The HBA for which this call is being executed.
+ * @size: The size of the IO that will be issued
+ *
+ * The routine adjusts the various Burst and Bandwidth counters used in
+ * Congestion management and E2E.
+ */
+int
+lpfc_update_cmf_cmd(struct lpfc_hba *phba, uint32_t size)
+{
+	uint64_t total;
+	struct lpfc_cgn_stat *cgs;
+	int cpu;
+
+	/* At this point we are either LPFC_CFG_MANAGED or LPFC_CFG_MONITOR */
+	if (phba->cmf_active_mode == LPFC_CFG_MANAGED &&
+	    phba->cmf_max_bytes_per_interval) {
+		total = 0;
+		for_each_present_cpu(cpu) {
+			cgs = per_cpu_ptr(phba->cmf_stat, cpu);
+			total += atomic64_read(&cgs->total_bytes);
+		}
+		if (total >= phba->cmf_max_bytes_per_interval) {
+			if (!atomic_xchg(&phba->cmf_bw_wait, 1)) {
+				lpfc_block_requests(phba);
+				phba->cmf_last_ts =
+					lpfc_calc_cmf_latency(phba);
+			}
+			atomic_inc(&phba->cmf_busy);
+			return -EBUSY;
+		}
+		if (size > atomic_read(&phba->rx_max_read_cnt))
+			atomic_set(&phba->rx_max_read_cnt, size);
+	}
+
+	cgs = per_cpu_ptr(phba->cmf_stat, raw_smp_processor_id());
+	atomic64_add(size, &cgs->total_bytes);
+	return 0;
+}
+
+/**
+ * lpfc_handle_fcp_err - FCP response handler
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_io_buf data structure.
+ * @fcpi_parm: FCP Initiator parameter.
+ *
+ * This routine is called to process response IOCB with status field
+ * IOSTAT_FCP_RSP_ERROR. This routine sets result field of scsi command
+ * based upon SCSI and FCP error.
+ **/
+static void
+lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_io_buf *lpfc_cmd,
+		    uint32_t fcpi_parm)
+{
+	struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
+	struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
+	uint32_t resp_info = fcprsp->rspStatus2;
+	uint32_t scsi_status = fcprsp->rspStatus3;
+	uint32_t *lp;
+	uint32_t host_status = DID_OK;
+	uint32_t rsplen = 0;
+	uint32_t fcpDl;
+	uint32_t logit = LOG_FCP | LOG_FCP_ERROR;
+
+
+	/*
+	 *  If this is a task management command, there is no
+	 *  scsi packet associated with this lpfc_cmd.  The driver
+	 *  consumes it.
+	 */
+	if (fcpcmd->fcpCntl2) {
+		scsi_status = 0;
+		goto out;
+	}
+
+	if (resp_info & RSP_LEN_VALID) {
+		rsplen = be32_to_cpu(fcprsp->rspRspLen);
+		if (rsplen != 0 && rsplen != 4 && rsplen != 8) {
+			lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+					 "2719 Invalid response length: "
+					 "tgt x%x lun x%llx cmnd x%x rsplen "
+					 "x%x\n", cmnd->device->id,
+					 cmnd->device->lun, cmnd->cmnd[0],
+					 rsplen);
+			host_status = DID_ERROR;
+			goto out;
+		}
+		if (fcprsp->rspInfo3 != RSP_NO_FAILURE) {
+			lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "2757 Protocol failure detected during "
+				 "processing of FCP I/O op: "
+				 "tgt x%x lun x%llx cmnd x%x rspInfo3 x%x\n",
+				 cmnd->device->id,
+				 cmnd->device->lun, cmnd->cmnd[0],
+				 fcprsp->rspInfo3);
+			host_status = DID_ERROR;
+			goto out;
+		}
+	}
+
+	if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
+		uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
+		if (snslen > SCSI_SENSE_BUFFERSIZE)
+			snslen = SCSI_SENSE_BUFFERSIZE;
+
+		if (resp_info & RSP_LEN_VALID)
+		  rsplen = be32_to_cpu(fcprsp->rspRspLen);
+		memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
+	}
+	lp = (uint32_t *)cmnd->sense_buffer;
+
+	/* special handling for under run conditions */
+	if (!scsi_status && (resp_info & RESID_UNDER)) {
+		/* don't log under runs if fcp set... */
+		if (vport->cfg_log_verbose & LOG_FCP)
+			logit = LOG_FCP_ERROR;
+		/* unless operator says so */
+		if (vport->cfg_log_verbose & LOG_FCP_UNDER)
+			logit = LOG_FCP_UNDER;
+	}
+
+	lpfc_printf_vlog(vport, KERN_WARNING, logit,
+			 "9024 FCP command x%x failed: x%x SNS x%x x%x "
+			 "Data: x%x x%x x%x x%x x%x\n",
+			 cmnd->cmnd[0], scsi_status,
+			 be32_to_cpu(*lp), be32_to_cpu(*(lp + 3)), resp_info,
+			 be32_to_cpu(fcprsp->rspResId),
+			 be32_to_cpu(fcprsp->rspSnsLen),
+			 be32_to_cpu(fcprsp->rspRspLen),
+			 fcprsp->rspInfo3);
+
+	scsi_set_resid(cmnd, 0);
+	fcpDl = be32_to_cpu(fcpcmd->fcpDl);
+	if (resp_info & RESID_UNDER) {
+		scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
+
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP_UNDER,
+				 "9025 FCP Underrun, expected %d, "
+				 "residual %d Data: x%x x%x x%x\n",
+				 fcpDl,
+				 scsi_get_resid(cmnd), fcpi_parm, cmnd->cmnd[0],
+				 cmnd->underflow);
+
+		/*
+		 * If there is an under run, check if under run reported by
+		 * storage array is same as the under run reported by HBA.
+		 * If this is not same, there is a dropped frame.
+		 */
+		if (fcpi_parm && (scsi_get_resid(cmnd) != fcpi_parm)) {
+			lpfc_printf_vlog(vport, KERN_WARNING,
+					 LOG_FCP | LOG_FCP_ERROR,
+					 "9026 FCP Read Check Error "
+					 "and Underrun Data: x%x x%x x%x x%x\n",
+					 fcpDl,
+					 scsi_get_resid(cmnd), fcpi_parm,
+					 cmnd->cmnd[0]);
+			scsi_set_resid(cmnd, scsi_bufflen(cmnd));
+			host_status = DID_ERROR;
+		}
+		/*
+		 * The cmnd->underflow is the minimum number of bytes that must
+		 * be transferred for this command.  Provided a sense condition
+		 * is not present, make sure the actual amount transferred is at
+		 * least the underflow value or fail.
+		 */
+		if (!(resp_info & SNS_LEN_VALID) &&
+		    (scsi_status == SAM_STAT_GOOD) &&
+		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd)
+		     < cmnd->underflow)) {
+			lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+					 "9027 FCP command x%x residual "
+					 "underrun converted to error "
+					 "Data: x%x x%x x%x\n",
+					 cmnd->cmnd[0], scsi_bufflen(cmnd),
+					 scsi_get_resid(cmnd), cmnd->underflow);
+			host_status = DID_ERROR;
+		}
+	} else if (resp_info & RESID_OVER) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+				 "9028 FCP command x%x residual overrun error. "
+				 "Data: x%x x%x\n", cmnd->cmnd[0],
+				 scsi_bufflen(cmnd), scsi_get_resid(cmnd));
+		host_status = DID_ERROR;
+
+	/*
+	 * Check SLI validation that all the transfer was actually done
+	 * (fcpi_parm should be zero). Apply check only to reads.
+	 */
+	} else if (fcpi_parm) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP | LOG_FCP_ERROR,
+				 "9029 FCP %s Check Error Data: "
+				 "x%x x%x x%x x%x x%x\n",
+				 ((cmnd->sc_data_direction == DMA_FROM_DEVICE) ?
+				 "Read" : "Write"),
+				 fcpDl, be32_to_cpu(fcprsp->rspResId),
+				 fcpi_parm, cmnd->cmnd[0], scsi_status);
+
+		/* There is some issue with the LPe12000 that causes it
+		 * to miscalculate the fcpi_parm and falsely trip this
+		 * recovery logic.  Detect this case and don't error when true.
+		 */
+		if (fcpi_parm > fcpDl)
+			goto out;
+
+		switch (scsi_status) {
+		case SAM_STAT_GOOD:
+		case SAM_STAT_CHECK_CONDITION:
+			/* Fabric dropped a data frame. Fail any successful
+			 * command in which we detected dropped frames.
+			 * A status of good or some check conditions could
+			 * be considered a successful command.
+			 */
+			host_status = DID_ERROR;
+			break;
+		}
+		scsi_set_resid(cmnd, scsi_bufflen(cmnd));
+	}
+
+ out:
+	cmnd->result = host_status << 16 | scsi_status;
+	lpfc_send_scsi_error_event(vport->phba, vport, lpfc_cmd, fcpi_parm);
+}
+
+/**
+ * lpfc_fcp_io_cmd_wqe_cmpl - Complete a FCP IO
+ * @phba: The hba for which this call is being executed.
+ * @pwqeIn: The command WQE for the scsi cmnd.
+ * @pwqeOut: Pointer to driver response WQE object.
+ *
+ * This routine assigns scsi command result by looking into response WQE
+ * status field appropriately. This routine handles QUEUE FULL condition as
+ * well by ramping down device queue depth.
+ **/
+static void
+lpfc_fcp_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
+			 struct lpfc_iocbq *pwqeOut)
+{
+	struct lpfc_io_buf *lpfc_cmd = pwqeIn->io_buf;
+	struct lpfc_wcqe_complete *wcqe = &pwqeOut->wcqe_cmpl;
+	struct lpfc_vport *vport = pwqeIn->vport;
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *ndlp;
+	struct scsi_cmnd *cmd;
+	unsigned long flags;
+	struct lpfc_fast_path_event *fast_path_evt;
+	struct Scsi_Host *shost;
+	u32 logit = LOG_FCP;
+	u32 status, idx;
+	u32 lat;
+	u8 wait_xb_clr = 0;
+
+	/* Sanity check on return of outstanding command */
+	if (!lpfc_cmd) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "9032 Null lpfc_cmd pointer. No "
+				 "release, skip completion\n");
+		return;
+	}
+
+	rdata = lpfc_cmd->rdata;
+	ndlp = rdata->pnode;
+
+	/* Sanity check on return of outstanding command */
+	cmd = lpfc_cmd->pCmd;
+	if (!cmd) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "9042 I/O completion: Not an active IO\n");
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+		return;
+	}
+	/* Guard against abort handler being called at same time */
+	spin_lock(&lpfc_cmd->buf_lock);
+	idx = lpfc_cmd->cur_iocbq.hba_wqidx;
+	if (phba->sli4_hba.hdwq)
+		phba->sli4_hba.hdwq[idx].scsi_cstat.io_cmpls++;
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (unlikely(phba->hdwqstat_on & LPFC_CHECK_SCSI_IO))
+		this_cpu_inc(phba->sli4_hba.c_stat->cmpl_io);
+#endif
+	shost = cmd->device->host;
+
+	status = bf_get(lpfc_wcqe_c_status, wcqe);
+	lpfc_cmd->status = (status & LPFC_IOCB_STATUS_MASK);
+	lpfc_cmd->result = (wcqe->parameter & IOERR_PARAM_MASK);
+
+	lpfc_cmd->flags &= ~LPFC_SBUF_XBUSY;
+	if (bf_get(lpfc_wcqe_c_xb, wcqe)) {
+		lpfc_cmd->flags |= LPFC_SBUF_XBUSY;
+		if (phba->cfg_fcp_wait_abts_rsp)
+			wait_xb_clr = 1;
+	}
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (lpfc_cmd->prot_data_type) {
+		struct scsi_dif_tuple *src = NULL;
+
+		src =  (struct scsi_dif_tuple *)lpfc_cmd->prot_data_segment;
+		/*
+		 * Used to restore any changes to protection
+		 * data for error injection.
+		 */
+		switch (lpfc_cmd->prot_data_type) {
+		case LPFC_INJERR_REFTAG:
+			src->ref_tag =
+				lpfc_cmd->prot_data;
+			break;
+		case LPFC_INJERR_APPTAG:
+			src->app_tag =
+				(uint16_t)lpfc_cmd->prot_data;
+			break;
+		case LPFC_INJERR_GUARD:
+			src->guard_tag =
+				(uint16_t)lpfc_cmd->prot_data;
+			break;
+		default:
+			break;
+		}
+
+		lpfc_cmd->prot_data = 0;
+		lpfc_cmd->prot_data_type = 0;
+		lpfc_cmd->prot_data_segment = NULL;
+	}
+#endif
+	if (unlikely(lpfc_cmd->status)) {
+		if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
+		    (lpfc_cmd->result & IOERR_DRVR_MASK))
+			lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
+		else if (lpfc_cmd->status >= IOSTAT_CNT)
+			lpfc_cmd->status = IOSTAT_DEFAULT;
+		if (lpfc_cmd->status == IOSTAT_FCP_RSP_ERROR &&
+		    !lpfc_cmd->fcp_rsp->rspStatus3 &&
+		    (lpfc_cmd->fcp_rsp->rspStatus2 & RESID_UNDER) &&
+		    !(vport->cfg_log_verbose & LOG_FCP_UNDER))
+			logit = 0;
+		else
+			logit = LOG_FCP | LOG_FCP_UNDER;
+		lpfc_printf_vlog(vport, KERN_WARNING, logit,
+				 "9034 FCP cmd x%x failed <%d/%lld> "
+				 "status: x%x result: x%x "
+				 "sid: x%x did: x%x oxid: x%x "
+				 "Data: x%x x%x x%x\n",
+				 cmd->cmnd[0],
+				 cmd->device ? cmd->device->id : 0xffff,
+				 cmd->device ? cmd->device->lun : 0xffff,
+				 lpfc_cmd->status, lpfc_cmd->result,
+				 vport->fc_myDID,
+				 (ndlp) ? ndlp->nlp_DID : 0,
+				 lpfc_cmd->cur_iocbq.sli4_xritag,
+				 wcqe->parameter, wcqe->total_data_placed,
+				 lpfc_cmd->cur_iocbq.iotag);
+	}
+
+	switch (lpfc_cmd->status) {
+	case IOSTAT_SUCCESS:
+		cmd->result = DID_OK << 16;
+		break;
+	case IOSTAT_FCP_RSP_ERROR:
+		lpfc_handle_fcp_err(vport, lpfc_cmd,
+				    pwqeIn->wqe.fcp_iread.total_xfer_len -
+				    wcqe->total_data_placed);
+		break;
+	case IOSTAT_NPORT_BSY:
+	case IOSTAT_FABRIC_BSY:
+		cmd->result = DID_TRANSPORT_DISRUPTED << 16;
+		fast_path_evt = lpfc_alloc_fast_evt(phba);
+		if (!fast_path_evt)
+			break;
+		fast_path_evt->un.fabric_evt.event_type =
+			FC_REG_FABRIC_EVENT;
+		fast_path_evt->un.fabric_evt.subcategory =
+			(lpfc_cmd->status == IOSTAT_NPORT_BSY) ?
+			LPFC_EVENT_PORT_BUSY : LPFC_EVENT_FABRIC_BUSY;
+		if (ndlp) {
+			memcpy(&fast_path_evt->un.fabric_evt.wwpn,
+			       &ndlp->nlp_portname,
+				sizeof(struct lpfc_name));
+			memcpy(&fast_path_evt->un.fabric_evt.wwnn,
+			       &ndlp->nlp_nodename,
+				sizeof(struct lpfc_name));
+		}
+		fast_path_evt->vport = vport;
+		fast_path_evt->work_evt.evt =
+			LPFC_EVT_FASTPATH_MGMT_EVT;
+		spin_lock_irqsave(&phba->hbalock, flags);
+		list_add_tail(&fast_path_evt->work_evt.evt_listp,
+			      &phba->work_list);
+		spin_unlock_irqrestore(&phba->hbalock, flags);
+		lpfc_worker_wake_up(phba);
+		lpfc_printf_vlog(vport, KERN_WARNING, logit,
+				 "9035 Fabric/Node busy FCP cmd x%x failed"
+				 " <%d/%lld> "
+				 "status: x%x result: x%x "
+				 "sid: x%x did: x%x oxid: x%x "
+				 "Data: x%x x%x x%x\n",
+				 cmd->cmnd[0],
+				 cmd->device ? cmd->device->id : 0xffff,
+				 cmd->device ? cmd->device->lun : 0xffff,
+				 lpfc_cmd->status, lpfc_cmd->result,
+				 vport->fc_myDID,
+				 (ndlp) ? ndlp->nlp_DID : 0,
+				 lpfc_cmd->cur_iocbq.sli4_xritag,
+				 wcqe->parameter,
+				 wcqe->total_data_placed,
+				 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
+		break;
+	case IOSTAT_REMOTE_STOP:
+		if (ndlp) {
+			/* This I/O was aborted by the target, we don't
+			 * know the rxid and because we did not send the
+			 * ABTS we cannot generate and RRQ.
+			 */
+			lpfc_set_rrq_active(phba, ndlp,
+					    lpfc_cmd->cur_iocbq.sli4_lxritag,
+					    0, 0);
+		}
+		fallthrough;
+	case IOSTAT_LOCAL_REJECT:
+		if (lpfc_cmd->result & IOERR_DRVR_MASK)
+			lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
+		if (lpfc_cmd->result == IOERR_ELXSEC_KEY_UNWRAP_ERROR ||
+		    lpfc_cmd->result ==
+		    IOERR_ELXSEC_KEY_UNWRAP_COMPARE_ERROR ||
+		    lpfc_cmd->result == IOERR_ELXSEC_CRYPTO_ERROR ||
+		    lpfc_cmd->result ==
+		    IOERR_ELXSEC_CRYPTO_COMPARE_ERROR) {
+			cmd->result = DID_NO_CONNECT << 16;
+			break;
+		}
+		if (lpfc_cmd->result == IOERR_INVALID_RPI ||
+		    lpfc_cmd->result == IOERR_LINK_DOWN ||
+		    lpfc_cmd->result == IOERR_NO_RESOURCES ||
+		    lpfc_cmd->result == IOERR_ABORT_REQUESTED ||
+		    lpfc_cmd->result == IOERR_RPI_SUSPENDED ||
+		    lpfc_cmd->result == IOERR_SLER_CMD_RCV_FAILURE) {
+			cmd->result = DID_TRANSPORT_DISRUPTED << 16;
+			break;
+		}
+		if ((lpfc_cmd->result == IOERR_RX_DMA_FAILED ||
+		     lpfc_cmd->result == IOERR_TX_DMA_FAILED) &&
+		     status == CQE_STATUS_DI_ERROR) {
+			if (scsi_get_prot_op(cmd) !=
+			    SCSI_PROT_NORMAL) {
+				/*
+				 * This is a response for a BG enabled
+				 * cmd. Parse BG error
+				 */
+				lpfc_parse_bg_err(phba, lpfc_cmd, pwqeOut);
+				break;
+			} else {
+				lpfc_printf_vlog(vport, KERN_WARNING,
+						 LOG_BG,
+						 "9040 non-zero BGSTAT "
+						 "on unprotected cmd\n");
+			}
+		}
+		lpfc_printf_vlog(vport, KERN_WARNING, logit,
+				 "9036 Local Reject FCP cmd x%x failed"
+				 " <%d/%lld> "
+				 "status: x%x result: x%x "
+				 "sid: x%x did: x%x oxid: x%x "
+				 "Data: x%x x%x x%x\n",
+				 cmd->cmnd[0],
+				 cmd->device ? cmd->device->id : 0xffff,
+				 cmd->device ? cmd->device->lun : 0xffff,
+				 lpfc_cmd->status, lpfc_cmd->result,
+				 vport->fc_myDID,
+				 (ndlp) ? ndlp->nlp_DID : 0,
+				 lpfc_cmd->cur_iocbq.sli4_xritag,
+				 wcqe->parameter,
+				 wcqe->total_data_placed,
+				 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
+		fallthrough;
+	default:
+		if (lpfc_cmd->status >= IOSTAT_CNT)
+			lpfc_cmd->status = IOSTAT_DEFAULT;
+		cmd->result = DID_ERROR << 16;
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,
+				 "9037 FCP Completion Error: xri %x "
+				 "status x%x result x%x [x%x] "
+				 "placed x%x\n",
+				 lpfc_cmd->cur_iocbq.sli4_xritag,
+				 lpfc_cmd->status, lpfc_cmd->result,
+				 wcqe->parameter,
+				 wcqe->total_data_placed);
+	}
+	if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
+		u32 *lp = (u32 *)cmd->sense_buffer;
+
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+				 "9039 Iodone <%d/%llu> cmd x%px, error "
+				 "x%x SNS x%x x%x LBA x%llx Data: x%x x%x\n",
+				 cmd->device->id, cmd->device->lun, cmd,
+				 cmd->result, *lp, *(lp + 3),
+				 (u64)scsi_get_lba(cmd),
+				 cmd->retries, scsi_get_resid(cmd));
+	}
+
+	if (vport->cfg_max_scsicmpl_time &&
+	    time_after(jiffies, lpfc_cmd->start_time +
+	    msecs_to_jiffies(vport->cfg_max_scsicmpl_time))) {
+		spin_lock_irqsave(shost->host_lock, flags);
+		if (ndlp) {
+			if (ndlp->cmd_qdepth >
+				atomic_read(&ndlp->cmd_pending) &&
+				(atomic_read(&ndlp->cmd_pending) >
+				LPFC_MIN_TGT_QDEPTH) &&
+				(cmd->cmnd[0] == READ_10 ||
+				cmd->cmnd[0] == WRITE_10))
+				ndlp->cmd_qdepth =
+					atomic_read(&ndlp->cmd_pending);
+
+			ndlp->last_change_time = jiffies;
+		}
+		spin_unlock_irqrestore(shost->host_lock, flags);
+	}
+	lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (lpfc_cmd->ts_cmd_start) {
+		lpfc_cmd->ts_isr_cmpl = lpfc_cmd->cur_iocbq.isr_timestamp;
+		lpfc_cmd->ts_data_io = ktime_get_ns();
+		phba->ktime_last_cmd = lpfc_cmd->ts_data_io;
+		lpfc_io_ktime(phba, lpfc_cmd);
+	}
+#endif
+	if (likely(!wait_xb_clr))
+		lpfc_cmd->pCmd = NULL;
+	spin_unlock(&lpfc_cmd->buf_lock);
+
+	/* Check if IO qualified for CMF */
+	if (phba->cmf_active_mode != LPFC_CFG_OFF &&
+	    cmd->sc_data_direction == DMA_FROM_DEVICE &&
+	    (scsi_sg_count(cmd))) {
+		/* Used when calculating average latency */
+		lat = ktime_get_ns() - lpfc_cmd->rx_cmd_start;
+		lpfc_update_cmf_cmpl(phba, lat, scsi_bufflen(cmd), shost);
+	}
+
+	if (wait_xb_clr)
+		goto out;
+
+	/* The sdev is not guaranteed to be valid post scsi_done upcall. */
+	scsi_done(cmd);
+
+	/*
+	 * If there is an abort thread waiting for command completion
+	 * wake up the thread.
+	 */
+	spin_lock(&lpfc_cmd->buf_lock);
+	lpfc_cmd->cur_iocbq.cmd_flag &= ~LPFC_DRIVER_ABORTED;
+	if (lpfc_cmd->waitq)
+		wake_up(lpfc_cmd->waitq);
+	spin_unlock(&lpfc_cmd->buf_lock);
+out:
+	lpfc_release_scsi_buf(phba, lpfc_cmd);
+}
+
+/**
+ * lpfc_scsi_cmd_iocb_cmpl - Scsi cmnd IOCB completion routine
+ * @phba: The Hba for which this call is being executed.
+ * @pIocbIn: The command IOCBQ for the scsi cmnd.
+ * @pIocbOut: The response IOCBQ for the scsi cmnd.
+ *
+ * This routine assigns scsi command result by looking into response IOCB
+ * status field appropriately. This routine handles QUEUE FULL condition as
+ * well by ramping down device queue depth.
+ **/
+static void
+lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
+			struct lpfc_iocbq *pIocbOut)
+{
+	struct lpfc_io_buf *lpfc_cmd =
+		(struct lpfc_io_buf *) pIocbIn->io_buf;
+	struct lpfc_vport      *vport = pIocbIn->vport;
+	struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
+	struct lpfc_nodelist *pnode = rdata->pnode;
+	struct scsi_cmnd *cmd;
+	unsigned long flags;
+	struct lpfc_fast_path_event *fast_path_evt;
+	struct Scsi_Host *shost;
+	int idx;
+	uint32_t logit = LOG_FCP;
+
+	/* Guard against abort handler being called at same time */
+	spin_lock(&lpfc_cmd->buf_lock);
+
+	/* Sanity check on return of outstanding command */
+	cmd = lpfc_cmd->pCmd;
+	if (!cmd || !phba) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "2621 IO completion: Not an active IO\n");
+		spin_unlock(&lpfc_cmd->buf_lock);
+		return;
+	}
+
+	idx = lpfc_cmd->cur_iocbq.hba_wqidx;
+	if (phba->sli4_hba.hdwq)
+		phba->sli4_hba.hdwq[idx].scsi_cstat.io_cmpls++;
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (unlikely(phba->hdwqstat_on & LPFC_CHECK_SCSI_IO))
+		this_cpu_inc(phba->sli4_hba.c_stat->cmpl_io);
+#endif
+	shost = cmd->device->host;
+
+	lpfc_cmd->result = (pIocbOut->iocb.un.ulpWord[4] & IOERR_PARAM_MASK);
+	lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
+	/* pick up SLI4 exchange busy status from HBA */
+	lpfc_cmd->flags &= ~LPFC_SBUF_XBUSY;
+	if (pIocbOut->cmd_flag & LPFC_EXCHANGE_BUSY)
+		lpfc_cmd->flags |= LPFC_SBUF_XBUSY;
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (lpfc_cmd->prot_data_type) {
+		struct scsi_dif_tuple *src = NULL;
+
+		src =  (struct scsi_dif_tuple *)lpfc_cmd->prot_data_segment;
+		/*
+		 * Used to restore any changes to protection
+		 * data for error injection.
+		 */
+		switch (lpfc_cmd->prot_data_type) {
+		case LPFC_INJERR_REFTAG:
+			src->ref_tag =
+				lpfc_cmd->prot_data;
+			break;
+		case LPFC_INJERR_APPTAG:
+			src->app_tag =
+				(uint16_t)lpfc_cmd->prot_data;
+			break;
+		case LPFC_INJERR_GUARD:
+			src->guard_tag =
+				(uint16_t)lpfc_cmd->prot_data;
+			break;
+		default:
+			break;
+		}
+
+		lpfc_cmd->prot_data = 0;
+		lpfc_cmd->prot_data_type = 0;
+		lpfc_cmd->prot_data_segment = NULL;
+	}
+#endif
+
+	if (unlikely(lpfc_cmd->status)) {
+		if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
+		    (lpfc_cmd->result & IOERR_DRVR_MASK))
+			lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
+		else if (lpfc_cmd->status >= IOSTAT_CNT)
+			lpfc_cmd->status = IOSTAT_DEFAULT;
+		if (lpfc_cmd->status == IOSTAT_FCP_RSP_ERROR &&
+		    !lpfc_cmd->fcp_rsp->rspStatus3 &&
+		    (lpfc_cmd->fcp_rsp->rspStatus2 & RESID_UNDER) &&
+		    !(vport->cfg_log_verbose & LOG_FCP_UNDER))
+			logit = 0;
+		else
+			logit = LOG_FCP | LOG_FCP_UNDER;
+		lpfc_printf_vlog(vport, KERN_WARNING, logit,
+			 "9030 FCP cmd x%x failed <%d/%lld> "
+			 "status: x%x result: x%x "
+			 "sid: x%x did: x%x oxid: x%x "
+			 "Data: x%x x%x\n",
+			 cmd->cmnd[0],
+			 cmd->device ? cmd->device->id : 0xffff,
+			 cmd->device ? cmd->device->lun : 0xffff,
+			 lpfc_cmd->status, lpfc_cmd->result,
+			 vport->fc_myDID,
+			 (pnode) ? pnode->nlp_DID : 0,
+			 phba->sli_rev == LPFC_SLI_REV4 ?
+			     lpfc_cmd->cur_iocbq.sli4_xritag : 0xffff,
+			 pIocbOut->iocb.ulpContext,
+			 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
+
+		switch (lpfc_cmd->status) {
+		case IOSTAT_FCP_RSP_ERROR:
+			/* Call FCP RSP handler to determine result */
+			lpfc_handle_fcp_err(vport, lpfc_cmd,
+					    pIocbOut->iocb.un.fcpi.fcpi_parm);
+			break;
+		case IOSTAT_NPORT_BSY:
+		case IOSTAT_FABRIC_BSY:
+			cmd->result = DID_TRANSPORT_DISRUPTED << 16;
+			fast_path_evt = lpfc_alloc_fast_evt(phba);
+			if (!fast_path_evt)
+				break;
+			fast_path_evt->un.fabric_evt.event_type =
+				FC_REG_FABRIC_EVENT;
+			fast_path_evt->un.fabric_evt.subcategory =
+				(lpfc_cmd->status == IOSTAT_NPORT_BSY) ?
+				LPFC_EVENT_PORT_BUSY : LPFC_EVENT_FABRIC_BUSY;
+			if (pnode) {
+				memcpy(&fast_path_evt->un.fabric_evt.wwpn,
+					&pnode->nlp_portname,
+					sizeof(struct lpfc_name));
+				memcpy(&fast_path_evt->un.fabric_evt.wwnn,
+					&pnode->nlp_nodename,
+					sizeof(struct lpfc_name));
+			}
+			fast_path_evt->vport = vport;
+			fast_path_evt->work_evt.evt =
+				LPFC_EVT_FASTPATH_MGMT_EVT;
+			spin_lock_irqsave(&phba->hbalock, flags);
+			list_add_tail(&fast_path_evt->work_evt.evt_listp,
+				&phba->work_list);
+			spin_unlock_irqrestore(&phba->hbalock, flags);
+			lpfc_worker_wake_up(phba);
+			break;
+		case IOSTAT_LOCAL_REJECT:
+		case IOSTAT_REMOTE_STOP:
+			if (lpfc_cmd->result == IOERR_ELXSEC_KEY_UNWRAP_ERROR ||
+			    lpfc_cmd->result ==
+					IOERR_ELXSEC_KEY_UNWRAP_COMPARE_ERROR ||
+			    lpfc_cmd->result == IOERR_ELXSEC_CRYPTO_ERROR ||
+			    lpfc_cmd->result ==
+					IOERR_ELXSEC_CRYPTO_COMPARE_ERROR) {
+				cmd->result = DID_NO_CONNECT << 16;
+				break;
+			}
+			if (lpfc_cmd->result == IOERR_INVALID_RPI ||
+			    lpfc_cmd->result == IOERR_NO_RESOURCES ||
+			    lpfc_cmd->result == IOERR_ABORT_REQUESTED ||
+			    lpfc_cmd->result == IOERR_SLER_CMD_RCV_FAILURE) {
+				cmd->result = DID_TRANSPORT_DISRUPTED << 16;
+				break;
+			}
+			if ((lpfc_cmd->result == IOERR_RX_DMA_FAILED ||
+			     lpfc_cmd->result == IOERR_TX_DMA_FAILED) &&
+			     pIocbOut->iocb.unsli3.sli3_bg.bgstat) {
+				if (scsi_get_prot_op(cmd) != SCSI_PROT_NORMAL) {
+					/*
+					 * This is a response for a BG enabled
+					 * cmd. Parse BG error
+					 */
+					lpfc_parse_bg_err(phba, lpfc_cmd,
+							pIocbOut);
+					break;
+				} else {
+					lpfc_printf_vlog(vport, KERN_WARNING,
+							LOG_BG,
+							"9031 non-zero BGSTAT "
+							"on unprotected cmd\n");
+				}
+			}
+			if ((lpfc_cmd->status == IOSTAT_REMOTE_STOP)
+				&& (phba->sli_rev == LPFC_SLI_REV4)
+				&& pnode) {
+				/* This IO was aborted by the target, we don't
+				 * know the rxid and because we did not send the
+				 * ABTS we cannot generate and RRQ.
+				 */
+				lpfc_set_rrq_active(phba, pnode,
+					lpfc_cmd->cur_iocbq.sli4_lxritag,
+					0, 0);
+			}
+			fallthrough;
+		default:
+			cmd->result = DID_ERROR << 16;
+			break;
+		}
+
+		if (!pnode || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
+			cmd->result = DID_TRANSPORT_DISRUPTED << 16 |
+				      SAM_STAT_BUSY;
+	} else
+		cmd->result = DID_OK << 16;
+
+	if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
+		uint32_t *lp = (uint32_t *)cmd->sense_buffer;
+
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+				 "0710 Iodone <%d/%llu> cmd x%px, error "
+				 "x%x SNS x%x x%x Data: x%x x%x\n",
+				 cmd->device->id, cmd->device->lun, cmd,
+				 cmd->result, *lp, *(lp + 3), cmd->retries,
+				 scsi_get_resid(cmd));
+	}
+
+	if (vport->cfg_max_scsicmpl_time &&
+	   time_after(jiffies, lpfc_cmd->start_time +
+		msecs_to_jiffies(vport->cfg_max_scsicmpl_time))) {
+		spin_lock_irqsave(shost->host_lock, flags);
+		if (pnode) {
+			if (pnode->cmd_qdepth >
+				atomic_read(&pnode->cmd_pending) &&
+				(atomic_read(&pnode->cmd_pending) >
+				LPFC_MIN_TGT_QDEPTH) &&
+				((cmd->cmnd[0] == READ_10) ||
+				(cmd->cmnd[0] == WRITE_10)))
+				pnode->cmd_qdepth =
+					atomic_read(&pnode->cmd_pending);
+
+			pnode->last_change_time = jiffies;
+		}
+		spin_unlock_irqrestore(shost->host_lock, flags);
+	}
+	lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
+
+	lpfc_cmd->pCmd = NULL;
+	spin_unlock(&lpfc_cmd->buf_lock);
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (lpfc_cmd->ts_cmd_start) {
+		lpfc_cmd->ts_isr_cmpl = pIocbIn->isr_timestamp;
+		lpfc_cmd->ts_data_io = ktime_get_ns();
+		phba->ktime_last_cmd = lpfc_cmd->ts_data_io;
+		lpfc_io_ktime(phba, lpfc_cmd);
+	}
+#endif
+
+	/* The sdev is not guaranteed to be valid post scsi_done upcall. */
+	scsi_done(cmd);
+
+	/*
+	 * If there is an abort thread waiting for command completion
+	 * wake up the thread.
+	 */
+	spin_lock(&lpfc_cmd->buf_lock);
+	lpfc_cmd->cur_iocbq.cmd_flag &= ~LPFC_DRIVER_ABORTED;
+	if (lpfc_cmd->waitq)
+		wake_up(lpfc_cmd->waitq);
+	spin_unlock(&lpfc_cmd->buf_lock);
+
+	lpfc_release_scsi_buf(phba, lpfc_cmd);
+}
+
+/**
+ * lpfc_scsi_prep_cmnd_buf_s3 - SLI-3 IOCB init for the IO
+ * @vport: Pointer to vport object.
+ * @lpfc_cmd: The scsi buffer which is going to be prep'ed.
+ * @tmo: timeout value for the IO
+ *
+ * Based on the data-direction of the command, initialize IOCB
+ * in the I/O buffer. Fill in the IOCB fields which are independent
+ * of the scsi buffer
+ *
+ * RETURNS 0 - SUCCESS,
+ **/
+static int lpfc_scsi_prep_cmnd_buf_s3(struct lpfc_vport *vport,
+				      struct lpfc_io_buf *lpfc_cmd,
+				      uint8_t tmo)
+{
+	IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
+	struct lpfc_iocbq *piocbq = &lpfc_cmd->cur_iocbq;
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct lpfc_nodelist *pnode = lpfc_cmd->ndlp;
+	int datadir = scsi_cmnd->sc_data_direction;
+	u32 fcpdl;
+
+	piocbq->iocb.un.fcpi.fcpi_XRdy = 0;
+
+	/*
+	 * There are three possibilities here - use scatter-gather segment, use
+	 * the single mapping, or neither.  Start the lpfc command prep by
+	 * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
+	 * data bde entry.
+	 */
+	if (scsi_sg_count(scsi_cmnd)) {
+		if (datadir == DMA_TO_DEVICE) {
+			iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
+			iocb_cmd->ulpPU = PARM_READ_CHECK;
+			if (vport->cfg_first_burst_size &&
+			    (pnode->nlp_flag & NLP_FIRSTBURST)) {
+				u32 xrdy_len;
+
+				fcpdl = scsi_bufflen(scsi_cmnd);
+				xrdy_len = min(fcpdl,
+					       vport->cfg_first_burst_size);
+				piocbq->iocb.un.fcpi.fcpi_XRdy = xrdy_len;
+			}
+			fcp_cmnd->fcpCntl3 = WRITE_DATA;
+		} else {
+			iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
+			iocb_cmd->ulpPU = PARM_READ_CHECK;
+			fcp_cmnd->fcpCntl3 = READ_DATA;
+		}
+	} else {
+		iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
+		iocb_cmd->un.fcpi.fcpi_parm = 0;
+		iocb_cmd->ulpPU = 0;
+		fcp_cmnd->fcpCntl3 = 0;
+	}
+
+	/*
+	 * Finish initializing those IOCB fields that are independent
+	 * of the scsi_cmnd request_buffer
+	 */
+	piocbq->iocb.ulpContext = pnode->nlp_rpi;
+	if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
+		piocbq->iocb.ulpFCP2Rcvy = 1;
+	else
+		piocbq->iocb.ulpFCP2Rcvy = 0;
+
+	piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
+	piocbq->io_buf  = lpfc_cmd;
+	if (!piocbq->cmd_cmpl)
+		piocbq->cmd_cmpl = lpfc_scsi_cmd_iocb_cmpl;
+	piocbq->iocb.ulpTimeout = tmo;
+	piocbq->vport = vport;
+	return 0;
+}
+
+/**
+ * lpfc_scsi_prep_cmnd_buf_s4 - SLI-4 WQE init for the IO
+ * @vport: Pointer to vport object.
+ * @lpfc_cmd: The scsi buffer which is going to be prep'ed.
+ * @tmo: timeout value for the IO
+ *
+ * Based on the data-direction of the command copy WQE template
+ * to I/O buffer WQE. Fill in the WQE fields which are independent
+ * of the scsi buffer
+ *
+ * RETURNS 0 - SUCCESS,
+ **/
+static int lpfc_scsi_prep_cmnd_buf_s4(struct lpfc_vport *vport,
+				      struct lpfc_io_buf *lpfc_cmd,
+				      uint8_t tmo)
+{
+	struct lpfc_hba *phba = vport->phba;
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	struct lpfc_sli4_hdw_queue *hdwq = NULL;
+	struct lpfc_iocbq *pwqeq = &lpfc_cmd->cur_iocbq;
+	struct lpfc_nodelist *pnode = lpfc_cmd->ndlp;
+	union lpfc_wqe128 *wqe = &pwqeq->wqe;
+	u16 idx = lpfc_cmd->hdwq_no;
+	int datadir = scsi_cmnd->sc_data_direction;
+
+	hdwq = &phba->sli4_hba.hdwq[idx];
+
+	/* Initialize 64 bytes only */
+	memset(wqe, 0, sizeof(union lpfc_wqe128));
+
+	/*
+	 * There are three possibilities here - use scatter-gather segment, use
+	 * the single mapping, or neither.
+	 */
+	if (scsi_sg_count(scsi_cmnd)) {
+		if (datadir == DMA_TO_DEVICE) {
+			/* From the iwrite template, initialize words 7 -  11 */
+			memcpy(&wqe->words[7],
+			       &lpfc_iwrite_cmd_template.words[7],
+			       sizeof(uint32_t) * 5);
+
+			fcp_cmnd->fcpCntl3 = WRITE_DATA;
+			if (hdwq)
+				hdwq->scsi_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 7 */
+			bf_set(wqe_tmo, &wqe->fcp_iread.wqe_com, tmo);
+
+			fcp_cmnd->fcpCntl3 = READ_DATA;
+			if (hdwq)
+				hdwq->scsi_cstat.input_requests++;
+
+			/* 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);
+		}
+	} else {
+		/* From the icmnd template, initialize words 4 - 11 */
+		memcpy(&wqe->words[4], &lpfc_icmnd_cmd_template.words[4],
+		       sizeof(uint32_t) * 8);
+
+		/* Word 7 */
+		bf_set(wqe_tmo, &wqe->fcp_icmd.wqe_com, tmo);
+
+		fcp_cmnd->fcpCntl3 = 0;
+		if (hdwq)
+			hdwq->scsi_cstat.control_requests++;
+	}
+
+	/*
+	 * Finish initializing those WQE fields that are independent
+	 * of the request_buffer
+	 */
+
+	 /* Word 3 */
+	bf_set(payload_offset_len, &wqe->fcp_icmd,
+	       sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
+
+	/* Word 6 */
+	bf_set(wqe_ctxt_tag, &wqe->generic.wqe_com,
+	       phba->sli4_hba.rpi_ids[pnode->nlp_rpi]);
+	bf_set(wqe_xri_tag, &wqe->generic.wqe_com, pwqeq->sli4_xritag);
+
+	/* Word 7*/
+	if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
+		bf_set(wqe_erp, &wqe->generic.wqe_com, 1);
+
+	bf_set(wqe_class, &wqe->generic.wqe_com,
+	       (pnode->nlp_fcp_info & 0x0f));
+
+	 /* Word 8 */
+	wqe->generic.wqe_com.abort_tag = pwqeq->iotag;
+
+	/* Word 9 */
+	bf_set(wqe_reqtag, &wqe->generic.wqe_com, pwqeq->iotag);
+
+	pwqeq->vport = vport;
+	pwqeq->io_buf = lpfc_cmd;
+	pwqeq->hba_wqidx = lpfc_cmd->hdwq_no;
+	pwqeq->cmd_cmpl = lpfc_fcp_io_cmd_wqe_cmpl;
+
+	return 0;
+}
+
+/**
+ * lpfc_scsi_prep_cmnd - Wrapper func for convert scsi cmnd to FCP info unit
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: The scsi command which needs to send.
+ * @pnode: Pointer to lpfc_nodelist.
+ *
+ * This routine initializes fcp_cmnd and iocb data structure from scsi command
+ * to transfer for device with SLI3 interface spec.
+ **/
+static int
+lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_io_buf *lpfc_cmd,
+		    struct lpfc_nodelist *pnode)
+{
+	struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
+	struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	u8 *ptr;
+
+	if (!pnode)
+		return 0;
+
+	lpfc_cmd->fcp_rsp->rspSnsLen = 0;
+	/* clear task management bits */
+	lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
+
+	int_to_scsilun(lpfc_cmd->pCmd->device->lun,
+		       &lpfc_cmd->fcp_cmnd->fcp_lun);
+
+	ptr = &fcp_cmnd->fcpCdb[0];
+	memcpy(ptr, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
+	if (scsi_cmnd->cmd_len < LPFC_FCP_CDB_LEN) {
+		ptr += scsi_cmnd->cmd_len;
+		memset(ptr, 0, (LPFC_FCP_CDB_LEN - scsi_cmnd->cmd_len));
+	}
+
+	fcp_cmnd->fcpCntl1 = SIMPLE_Q;
+
+	lpfc_scsi_prep_cmnd_buf(vport, lpfc_cmd, lpfc_cmd->timeout);
+
+	return 0;
+}
+
+/**
+ * lpfc_scsi_prep_task_mgmt_cmd_s3 - Convert SLI3 scsi TM cmd to FCP info unit
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_io_buf data structure.
+ * @lun: Logical unit number.
+ * @task_mgmt_cmd: SCSI task management command.
+ *
+ * This routine creates FCP information unit corresponding to @task_mgmt_cmd
+ * for device with SLI-3 interface spec.
+ *
+ * Return codes:
+ *   0 - Error
+ *   1 - Success
+ **/
+static int
+lpfc_scsi_prep_task_mgmt_cmd_s3(struct lpfc_vport *vport,
+				struct lpfc_io_buf *lpfc_cmd,
+				u64 lun, u8 task_mgmt_cmd)
+{
+	struct lpfc_iocbq *piocbq;
+	IOCB_t *piocb;
+	struct fcp_cmnd *fcp_cmnd;
+	struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
+	struct lpfc_nodelist *ndlp = rdata->pnode;
+
+	if (!ndlp || ndlp->nlp_state != NLP_STE_MAPPED_NODE)
+		return 0;
+
+	piocbq = &(lpfc_cmd->cur_iocbq);
+	piocbq->vport = vport;
+
+	piocb = &piocbq->iocb;
+
+	fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	/* Clear out any old data in the FCP command area */
+	memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
+	int_to_scsilun(lun, &fcp_cmnd->fcp_lun);
+	fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
+	if (!(vport->phba->sli3_options & LPFC_SLI3_BG_ENABLED))
+		lpfc_fcpcmd_to_iocb(piocb->unsli3.fcp_ext.icd, fcp_cmnd);
+	piocb->ulpCommand = CMD_FCP_ICMND64_CR;
+	piocb->ulpContext = ndlp->nlp_rpi;
+	piocb->ulpFCP2Rcvy = (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) ? 1 : 0;
+	piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
+	piocb->ulpPU = 0;
+	piocb->un.fcpi.fcpi_parm = 0;
+
+	/* ulpTimeout is only one byte */
+	if (lpfc_cmd->timeout > 0xff) {
+		/*
+		 * Do not timeout the command at the firmware level.
+		 * The driver will provide the timeout mechanism.
+		 */
+		piocb->ulpTimeout = 0;
+	} else
+		piocb->ulpTimeout = lpfc_cmd->timeout;
+
+	return 1;
+}
+
+/**
+ * lpfc_scsi_prep_task_mgmt_cmd_s4 - Convert SLI4 scsi TM cmd to FCP info unit
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_io_buf data structure.
+ * @lun: Logical unit number.
+ * @task_mgmt_cmd: SCSI task management command.
+ *
+ * This routine creates FCP information unit corresponding to @task_mgmt_cmd
+ * for device with SLI-4 interface spec.
+ *
+ * Return codes:
+ *   0 - Error
+ *   1 - Success
+ **/
+static int
+lpfc_scsi_prep_task_mgmt_cmd_s4(struct lpfc_vport *vport,
+				struct lpfc_io_buf *lpfc_cmd,
+				u64 lun, u8 task_mgmt_cmd)
+{
+	struct lpfc_iocbq *pwqeq = &lpfc_cmd->cur_iocbq;
+	union lpfc_wqe128 *wqe = &pwqeq->wqe;
+	struct fcp_cmnd *fcp_cmnd;
+	struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
+	struct lpfc_nodelist *ndlp = rdata->pnode;
+
+	if (!ndlp || ndlp->nlp_state != NLP_STE_MAPPED_NODE)
+		return 0;
+
+	pwqeq->vport = vport;
+	/* Initialize 64 bytes only */
+	memset(wqe, 0, sizeof(union lpfc_wqe128));
+
+	/* From the icmnd template, initialize words 4 - 11 */
+	memcpy(&wqe->words[4], &lpfc_icmnd_cmd_template.words[4],
+	       sizeof(uint32_t) * 8);
+
+	fcp_cmnd = lpfc_cmd->fcp_cmnd;
+	/* Clear out any old data in the FCP command area */
+	memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
+	int_to_scsilun(lun, &fcp_cmnd->fcp_lun);
+	fcp_cmnd->fcpCntl3 = 0;
+	fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
+
+	bf_set(payload_offset_len, &wqe->fcp_icmd,
+	       sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
+	bf_set(cmd_buff_len, &wqe->fcp_icmd, 0);
+	bf_set(wqe_ctxt_tag, &wqe->generic.wqe_com,  /* ulpContext */
+	       vport->phba->sli4_hba.rpi_ids[ndlp->nlp_rpi]);
+	bf_set(wqe_erp, &wqe->fcp_icmd.wqe_com,
+	       ((ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) ? 1 : 0));
+	bf_set(wqe_class, &wqe->fcp_icmd.wqe_com,
+	       (ndlp->nlp_fcp_info & 0x0f));
+
+	/* ulpTimeout is only one byte */
+	if (lpfc_cmd->timeout > 0xff) {
+		/*
+		 * Do not timeout the command at the firmware level.
+		 * The driver will provide the timeout mechanism.
+		 */
+		bf_set(wqe_tmo, &wqe->fcp_icmd.wqe_com, 0);
+	} else {
+		bf_set(wqe_tmo, &wqe->fcp_icmd.wqe_com, lpfc_cmd->timeout);
+	}
+
+	lpfc_prep_embed_io(vport->phba, lpfc_cmd);
+	bf_set(wqe_xri_tag, &wqe->generic.wqe_com, pwqeq->sli4_xritag);
+	wqe->generic.wqe_com.abort_tag = pwqeq->iotag;
+	bf_set(wqe_reqtag, &wqe->generic.wqe_com, pwqeq->iotag);
+
+	lpfc_sli4_set_rsp_sgl_last(vport->phba, lpfc_cmd);
+
+	return 1;
+}
+
+/**
+ * lpfc_scsi_api_table_setup - Set up scsi api function jump table
+ * @phba: The hba struct for which this call is being executed.
+ * @dev_grp: The HBA PCI-Device group number.
+ *
+ * This routine sets up the SCSI interface API function jump table in @phba
+ * struct.
+ * Returns: 0 - success, -ENODEV - failure.
+ **/
+int
+lpfc_scsi_api_table_setup(struct lpfc_hba *phba, uint8_t dev_grp)
+{
+
+	phba->lpfc_scsi_unprep_dma_buf = lpfc_scsi_unprep_dma_buf;
+
+	switch (dev_grp) {
+	case LPFC_PCI_DEV_LP:
+		phba->lpfc_scsi_prep_dma_buf = lpfc_scsi_prep_dma_buf_s3;
+		phba->lpfc_bg_scsi_prep_dma_buf = lpfc_bg_scsi_prep_dma_buf_s3;
+		phba->lpfc_release_scsi_buf = lpfc_release_scsi_buf_s3;
+		phba->lpfc_get_scsi_buf = lpfc_get_scsi_buf_s3;
+		phba->lpfc_scsi_prep_cmnd_buf = lpfc_scsi_prep_cmnd_buf_s3;
+		phba->lpfc_scsi_prep_task_mgmt_cmd =
+					lpfc_scsi_prep_task_mgmt_cmd_s3;
+		break;
+	case LPFC_PCI_DEV_OC:
+		phba->lpfc_scsi_prep_dma_buf = lpfc_scsi_prep_dma_buf_s4;
+		phba->lpfc_bg_scsi_prep_dma_buf = lpfc_bg_scsi_prep_dma_buf_s4;
+		phba->lpfc_release_scsi_buf = lpfc_release_scsi_buf_s4;
+		phba->lpfc_get_scsi_buf = lpfc_get_scsi_buf_s4;
+		phba->lpfc_scsi_prep_cmnd_buf = lpfc_scsi_prep_cmnd_buf_s4;
+		phba->lpfc_scsi_prep_task_mgmt_cmd =
+					lpfc_scsi_prep_task_mgmt_cmd_s4;
+		break;
+	default:
+		lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+				"1418 Invalid HBA PCI-device group: 0x%x\n",
+				dev_grp);
+		return -ENODEV;
+	}
+	phba->lpfc_rampdown_queue_depth = lpfc_rampdown_queue_depth;
+	phba->lpfc_scsi_cmd_iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
+	return 0;
+}
+
+/**
+ * lpfc_tskmgmt_def_cmpl - IOCB completion routine for task management command
+ * @phba: The Hba for which this call is being executed.
+ * @cmdiocbq: Pointer to lpfc_iocbq data structure.
+ * @rspiocbq: Pointer to lpfc_iocbq data structure.
+ *
+ * This routine is IOCB completion routine for device reset and target reset
+ * routine. This routine release scsi buffer associated with lpfc_cmd.
+ **/
+static void
+lpfc_tskmgmt_def_cmpl(struct lpfc_hba *phba,
+			struct lpfc_iocbq *cmdiocbq,
+			struct lpfc_iocbq *rspiocbq)
+{
+	struct lpfc_io_buf *lpfc_cmd = cmdiocbq->io_buf;
+	if (lpfc_cmd)
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+	return;
+}
+
+/**
+ * lpfc_check_pci_resettable - Walks list of devices on pci_dev's bus to check
+ *                             if issuing a pci_bus_reset is possibly unsafe
+ * @phba: lpfc_hba pointer.
+ *
+ * Description:
+ * Walks the bus_list to ensure only PCI devices with Emulex
+ * vendor id, device ids that support hot reset, and only one occurrence
+ * of function 0.
+ *
+ * Returns:
+ * -EBADSLT,  detected invalid device
+ *      0,    successful
+ */
+int
+lpfc_check_pci_resettable(struct lpfc_hba *phba)
+{
+	const struct pci_dev *pdev = phba->pcidev;
+	struct pci_dev *ptr = NULL;
+	u8 counter = 0;
+
+	/* Walk the list of devices on the pci_dev's bus */
+	list_for_each_entry(ptr, &pdev->bus->devices, bus_list) {
+		/* Check for Emulex Vendor ID */
+		if (ptr->vendor != PCI_VENDOR_ID_EMULEX) {
+			lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+					"8346 Non-Emulex vendor found: "
+					"0x%04x\n", ptr->vendor);
+			return -EBADSLT;
+		}
+
+		/* Check for valid Emulex Device ID */
+		if (phba->sli_rev != LPFC_SLI_REV4 ||
+		    phba->hba_flag & HBA_FCOE_MODE) {
+			lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+					"8347 Incapable PCI reset device: "
+					"0x%04x\n", ptr->device);
+			return -EBADSLT;
+		}
+
+		/* Check for only one function 0 ID to ensure only one HBA on
+		 * secondary bus
+		 */
+		if (ptr->devfn == 0) {
+			if (++counter > 1) {
+				lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+						"8348 More than one device on "
+						"secondary bus found\n");
+				return -EBADSLT;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * lpfc_info - Info entry point of scsi_host_template data structure
+ * @host: The scsi host for which this call is being executed.
+ *
+ * This routine provides module information about hba.
+ *
+ * Reutrn code:
+ *   Pointer to char - Success.
+ **/
+const char *
+lpfc_info(struct Scsi_Host *host)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *) host->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	int link_speed = 0;
+	static char lpfcinfobuf[384];
+	char tmp[384] = {0};
+
+	memset(lpfcinfobuf, 0, sizeof(lpfcinfobuf));
+	if (phba && phba->pcidev){
+		/* Model Description */
+		scnprintf(tmp, sizeof(tmp), phba->ModelDesc);
+		if (strlcat(lpfcinfobuf, tmp, sizeof(lpfcinfobuf)) >=
+		    sizeof(lpfcinfobuf))
+			goto buffer_done;
+
+		/* PCI Info */
+		scnprintf(tmp, sizeof(tmp),
+			  " on PCI bus %02x device %02x irq %d",
+			  phba->pcidev->bus->number, phba->pcidev->devfn,
+			  phba->pcidev->irq);
+		if (strlcat(lpfcinfobuf, tmp, sizeof(lpfcinfobuf)) >=
+		    sizeof(lpfcinfobuf))
+			goto buffer_done;
+
+		/* Port Number */
+		if (phba->Port[0]) {
+			scnprintf(tmp, sizeof(tmp), " port %s", phba->Port);
+			if (strlcat(lpfcinfobuf, tmp, sizeof(lpfcinfobuf)) >=
+			    sizeof(lpfcinfobuf))
+				goto buffer_done;
+		}
+
+		/* Link Speed */
+		link_speed = lpfc_sli_port_speed_get(phba);
+		if (link_speed != 0) {
+			scnprintf(tmp, sizeof(tmp),
+				  " Logical Link Speed: %d Mbps", link_speed);
+			if (strlcat(lpfcinfobuf, tmp, sizeof(lpfcinfobuf)) >=
+			    sizeof(lpfcinfobuf))
+				goto buffer_done;
+		}
+
+		/* PCI resettable */
+		if (!lpfc_check_pci_resettable(phba)) {
+			scnprintf(tmp, sizeof(tmp), " PCI resettable");
+			strlcat(lpfcinfobuf, tmp, sizeof(lpfcinfobuf));
+		}
+	}
+
+buffer_done:
+	return lpfcinfobuf;
+}
+
+/**
+ * lpfc_poll_rearm_timer - Routine to modify fcp_poll timer of hba
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine modifies fcp_poll_timer  field of @phba by cfg_poll_tmo.
+ * The default value of cfg_poll_tmo is 10 milliseconds.
+ **/
+static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
+{
+	unsigned long  poll_tmo_expires =
+		(jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
+
+	if (!list_empty(&phba->sli.sli3_ring[LPFC_FCP_RING].txcmplq))
+		mod_timer(&phba->fcp_poll_timer,
+			  poll_tmo_expires);
+}
+
+/**
+ * lpfc_poll_start_timer - Routine to start fcp_poll_timer of HBA
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine starts the fcp_poll_timer of @phba.
+ **/
+void lpfc_poll_start_timer(struct lpfc_hba * phba)
+{
+	lpfc_poll_rearm_timer(phba);
+}
+
+/**
+ * lpfc_poll_timeout - Restart polling timer
+ * @t: Timer construct where lpfc_hba data structure pointer is obtained.
+ *
+ * This routine restarts fcp_poll timer, when FCP ring  polling is enable
+ * and FCP Ring interrupt is disable.
+ **/
+void lpfc_poll_timeout(struct timer_list *t)
+{
+	struct lpfc_hba *phba = from_timer(phba, t, fcp_poll_timer);
+
+	if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+		lpfc_sli_handle_fast_ring_event(phba,
+			&phba->sli.sli3_ring[LPFC_FCP_RING], HA_R0RE_REQ);
+
+		if (phba->cfg_poll & DISABLE_FCP_RING_INT)
+			lpfc_poll_rearm_timer(phba);
+	}
+}
+
+/*
+ * lpfc_is_command_vm_io - get the UUID from blk cgroup
+ * @cmd: Pointer to scsi_cmnd data structure
+ * Returns UUID if present, otherwise NULL
+ */
+static char *lpfc_is_command_vm_io(struct scsi_cmnd *cmd)
+{
+	struct bio *bio = scsi_cmd_to_rq(cmd)->bio;
+
+	if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !bio)
+		return NULL;
+	return blkcg_get_fc_appid(bio);
+}
+
+/**
+ * lpfc_queuecommand - scsi_host_template queuecommand entry point
+ * @shost: kernel scsi host pointer.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * Driver registers this routine to scsi midlayer to submit a @cmd to process.
+ * This routine prepares an IOCB from scsi command and provides to firmware.
+ * The @done callback is invoked after driver finished processing the command.
+ *
+ * Return value :
+ *   0 - Success
+ *   SCSI_MLQUEUE_HOST_BUSY - Block all devices served by this host temporarily.
+ **/
+static int
+lpfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	struct lpfc_iocbq *cur_iocbq = NULL;
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *ndlp;
+	struct lpfc_io_buf *lpfc_cmd;
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+	int err, idx;
+	u8 *uuid = NULL;
+	uint64_t start;
+
+	start = ktime_get_ns();
+	rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
+
+	/* sanity check on references */
+	if (unlikely(!rdata) || unlikely(!rport))
+		goto out_fail_command;
+
+	err = fc_remote_port_chkready(rport);
+	if (err) {
+		cmnd->result = err;
+		goto out_fail_command;
+	}
+	ndlp = rdata->pnode;
+
+	if ((scsi_get_prot_op(cmnd) != SCSI_PROT_NORMAL) &&
+		(!(phba->sli3_options & LPFC_SLI3_BG_ENABLED))) {
+
+		lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
+				"9058 BLKGRD: ERROR: rcvd protected cmd:%02x"
+				" op:%02x str=%s without registering for"
+				" BlockGuard - Rejecting command\n",
+				cmnd->cmnd[0], scsi_get_prot_op(cmnd),
+				dif_op_str[scsi_get_prot_op(cmnd)]);
+		goto out_fail_command;
+	}
+
+	/*
+	 * Catch race where our node has transitioned, but the
+	 * transport is still transitioning.
+	 */
+	if (!ndlp)
+		goto out_tgt_busy1;
+
+	/* Check if IO qualifies for CMF */
+	if (phba->cmf_active_mode != LPFC_CFG_OFF &&
+	    cmnd->sc_data_direction == DMA_FROM_DEVICE &&
+	    (scsi_sg_count(cmnd))) {
+		/* Latency start time saved in rx_cmd_start later in routine */
+		err = lpfc_update_cmf_cmd(phba, scsi_bufflen(cmnd));
+		if (err)
+			goto out_tgt_busy1;
+	}
+
+	if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
+		if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) {
+			lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP_ERROR,
+					 "3377 Target Queue Full, scsi Id:%d "
+					 "Qdepth:%d Pending command:%d"
+					 " WWNN:%02x:%02x:%02x:%02x:"
+					 "%02x:%02x:%02x:%02x, "
+					 " WWPN:%02x:%02x:%02x:%02x:"
+					 "%02x:%02x:%02x:%02x",
+					 ndlp->nlp_sid, ndlp->cmd_qdepth,
+					 atomic_read(&ndlp->cmd_pending),
+					 ndlp->nlp_nodename.u.wwn[0],
+					 ndlp->nlp_nodename.u.wwn[1],
+					 ndlp->nlp_nodename.u.wwn[2],
+					 ndlp->nlp_nodename.u.wwn[3],
+					 ndlp->nlp_nodename.u.wwn[4],
+					 ndlp->nlp_nodename.u.wwn[5],
+					 ndlp->nlp_nodename.u.wwn[6],
+					 ndlp->nlp_nodename.u.wwn[7],
+					 ndlp->nlp_portname.u.wwn[0],
+					 ndlp->nlp_portname.u.wwn[1],
+					 ndlp->nlp_portname.u.wwn[2],
+					 ndlp->nlp_portname.u.wwn[3],
+					 ndlp->nlp_portname.u.wwn[4],
+					 ndlp->nlp_portname.u.wwn[5],
+					 ndlp->nlp_portname.u.wwn[6],
+					 ndlp->nlp_portname.u.wwn[7]);
+			goto out_tgt_busy2;
+		}
+	}
+
+	lpfc_cmd = lpfc_get_scsi_buf(phba, ndlp, cmnd);
+	if (lpfc_cmd == NULL) {
+		lpfc_rampdown_queue_depth(phba);
+
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP_ERROR,
+				 "0707 driver's buffer pool is empty, "
+				 "IO busied\n");
+		goto out_host_busy;
+	}
+	lpfc_cmd->rx_cmd_start = start;
+
+	cur_iocbq = &lpfc_cmd->cur_iocbq;
+	/*
+	 * Store the midlayer's command structure for the completion phase
+	 * and complete the command initialization.
+	 */
+	lpfc_cmd->pCmd  = cmnd;
+	lpfc_cmd->rdata = rdata;
+	lpfc_cmd->ndlp = ndlp;
+	cur_iocbq->cmd_cmpl = NULL;
+	cmnd->host_scribble = (unsigned char *)lpfc_cmd;
+
+	err = lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp);
+	if (err)
+		goto out_host_busy_release_buf;
+
+	if (scsi_get_prot_op(cmnd) != SCSI_PROT_NORMAL) {
+		if (vport->phba->cfg_enable_bg) {
+			lpfc_printf_vlog(vport,
+					 KERN_INFO, LOG_SCSI_CMD,
+					 "9033 BLKGRD: rcvd %s cmd:x%x "
+					 "reftag x%x cnt %u pt %x\n",
+					 dif_op_str[scsi_get_prot_op(cmnd)],
+					 cmnd->cmnd[0],
+					 scsi_prot_ref_tag(cmnd),
+					 scsi_logical_block_count(cmnd),
+					 (cmnd->cmnd[1]>>5));
+		}
+		err = lpfc_bg_scsi_prep_dma_buf(phba, lpfc_cmd);
+	} else {
+		if (vport->phba->cfg_enable_bg) {
+			lpfc_printf_vlog(vport,
+					 KERN_INFO, LOG_SCSI_CMD,
+					 "9038 BLKGRD: rcvd PROT_NORMAL cmd: "
+					 "x%x reftag x%x cnt %u pt %x\n",
+					 cmnd->cmnd[0],
+					 scsi_prot_ref_tag(cmnd),
+					 scsi_logical_block_count(cmnd),
+					 (cmnd->cmnd[1]>>5));
+		}
+		err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
+	}
+
+	if (unlikely(err)) {
+		if (err == 2) {
+			cmnd->result = DID_ERROR << 16;
+			goto out_fail_command_release_buf;
+		}
+		goto out_host_busy_free_buf;
+	}
+
+	/* check the necessary and sufficient condition to support VMID */
+	if (lpfc_is_vmid_enabled(phba) &&
+	    (ndlp->vmid_support ||
+	     phba->pport->vmid_priority_tagging ==
+	     LPFC_VMID_PRIO_TAG_ALL_TARGETS)) {
+		/* is the I/O generated by a VM, get the associated virtual */
+		/* entity id */
+		uuid = lpfc_is_command_vm_io(cmnd);
+
+		if (uuid) {
+			err = lpfc_vmid_get_appid(vport, uuid,
+					cmnd->sc_data_direction,
+					(union lpfc_vmid_io_tag *)
+						&cur_iocbq->vmid_tag);
+			if (!err)
+				cur_iocbq->cmd_flag |= LPFC_IO_VMID;
+		}
+	}
+
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (unlikely(phba->hdwqstat_on & LPFC_CHECK_SCSI_IO))
+		this_cpu_inc(phba->sli4_hba.c_stat->xmt_io);
+#endif
+	/* Issue I/O to adapter */
+	err = lpfc_sli_issue_fcp_io(phba, LPFC_FCP_RING, cur_iocbq,
+				    SLI_IOCB_RET_IOCB);
+#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
+	if (start) {
+		lpfc_cmd->ts_cmd_start = start;
+		lpfc_cmd->ts_last_cmd = phba->ktime_last_cmd;
+		lpfc_cmd->ts_cmd_wqput = ktime_get_ns();
+	} else {
+		lpfc_cmd->ts_cmd_start = 0;
+	}
+#endif
+	if (err) {
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+				 "3376 FCP could not issue iocb err %x "
+				 "FCP cmd x%x <%d/%llu> "
+				 "sid: x%x did: x%x oxid: x%x "
+				 "Data: x%x x%x x%x x%x\n",
+				 err, cmnd->cmnd[0],
+				 cmnd->device ? cmnd->device->id : 0xffff,
+				 cmnd->device ? cmnd->device->lun : (u64)-1,
+				 vport->fc_myDID, ndlp->nlp_DID,
+				 phba->sli_rev == LPFC_SLI_REV4 ?
+				 cur_iocbq->sli4_xritag : 0xffff,
+				 phba->sli_rev == LPFC_SLI_REV4 ?
+				 phba->sli4_hba.rpi_ids[ndlp->nlp_rpi] :
+				 cur_iocbq->iocb.ulpContext,
+				 cur_iocbq->iotag,
+				 phba->sli_rev == LPFC_SLI_REV4 ?
+				 bf_get(wqe_tmo,
+					&cur_iocbq->wqe.generic.wqe_com) :
+				 cur_iocbq->iocb.ulpTimeout,
+				 (uint32_t)(scsi_cmd_to_rq(cmnd)->timeout / 1000));
+
+		goto out_host_busy_free_buf;
+	}
+
+	if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+		lpfc_sli_handle_fast_ring_event(phba,
+			&phba->sli.sli3_ring[LPFC_FCP_RING], HA_R0RE_REQ);
+
+		if (phba->cfg_poll & DISABLE_FCP_RING_INT)
+			lpfc_poll_rearm_timer(phba);
+	}
+
+	if (phba->cfg_xri_rebalancing)
+		lpfc_keep_pvt_pool_above_lowwm(phba, lpfc_cmd->hdwq_no);
+
+	return 0;
+
+ out_host_busy_free_buf:
+	idx = lpfc_cmd->hdwq_no;
+	lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
+	if (phba->sli4_hba.hdwq) {
+		switch (lpfc_cmd->fcp_cmnd->fcpCntl3) {
+		case WRITE_DATA:
+			phba->sli4_hba.hdwq[idx].scsi_cstat.output_requests--;
+			break;
+		case READ_DATA:
+			phba->sli4_hba.hdwq[idx].scsi_cstat.input_requests--;
+			break;
+		default:
+			phba->sli4_hba.hdwq[idx].scsi_cstat.control_requests--;
+		}
+	}
+ out_host_busy_release_buf:
+	lpfc_release_scsi_buf(phba, lpfc_cmd);
+ out_host_busy:
+	lpfc_update_cmf_cmpl(phba, LPFC_CGN_NOT_SENT, scsi_bufflen(cmnd),
+			     shost);
+	return SCSI_MLQUEUE_HOST_BUSY;
+
+ out_tgt_busy2:
+	lpfc_update_cmf_cmpl(phba, LPFC_CGN_NOT_SENT, scsi_bufflen(cmnd),
+			     shost);
+ out_tgt_busy1:
+	return SCSI_MLQUEUE_TARGET_BUSY;
+
+ out_fail_command_release_buf:
+	lpfc_release_scsi_buf(phba, lpfc_cmd);
+	lpfc_update_cmf_cmpl(phba, LPFC_CGN_NOT_SENT, scsi_bufflen(cmnd),
+			     shost);
+
+ out_fail_command:
+	scsi_done(cmnd);
+	return 0;
+}
+
+/*
+ * lpfc_vmid_vport_cleanup - cleans up the resources associated with a vport
+ * @vport: The virtual port for which this call is being executed.
+ */
+void lpfc_vmid_vport_cleanup(struct lpfc_vport *vport)
+{
+	u32 bucket;
+	struct lpfc_vmid *cur;
+
+	if (vport->port_type == LPFC_PHYSICAL_PORT)
+		del_timer_sync(&vport->phba->inactive_vmid_poll);
+
+	kfree(vport->qfpa_res);
+	kfree(vport->vmid_priority.vmid_range);
+	kfree(vport->vmid);
+
+	if (!hash_empty(vport->hash_table))
+		hash_for_each(vport->hash_table, bucket, cur, hnode)
+			hash_del(&cur->hnode);
+
+	vport->qfpa_res = NULL;
+	vport->vmid_priority.vmid_range = NULL;
+	vport->vmid = NULL;
+	vport->cur_vmid_cnt = 0;
+}
+
+/**
+ * lpfc_abort_handler - scsi_host_template eh_abort_handler entry point
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine aborts @cmnd pending in base driver.
+ *
+ * Return code :
+ *   0x2003 - Error
+ *   0x2002 - Success
+ **/
+static int
+lpfc_abort_handler(struct scsi_cmnd *cmnd)
+{
+	struct Scsi_Host  *shost = cmnd->device->host;
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+	struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	struct lpfc_iocbq *iocb;
+	struct lpfc_io_buf *lpfc_cmd;
+	int ret = SUCCESS, status = 0;
+	struct lpfc_sli_ring *pring_s4 = NULL;
+	struct lpfc_sli_ring *pring = NULL;
+	int ret_val;
+	unsigned long flags;
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waitq);
+
+	status = fc_block_rport(rport);
+	if (status != 0 && status != SUCCESS)
+		return status;
+
+	lpfc_cmd = (struct lpfc_io_buf *)cmnd->host_scribble;
+	if (!lpfc_cmd)
+		return ret;
+
+	/* Guard against IO completion being called at same time */
+	spin_lock_irqsave(&lpfc_cmd->buf_lock, flags);
+
+	spin_lock(&phba->hbalock);
+	/* driver queued commands are in process of being flushed */
+	if (phba->hba_flag & HBA_IOQ_FLUSH) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			"3168 SCSI Layer abort requested I/O has been "
+			"flushed by LLD.\n");
+		ret = FAILED;
+		goto out_unlock_hba;
+	}
+
+	if (!lpfc_cmd->pCmd) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			 "2873 SCSI Layer I/O Abort Request IO CMPL Status "
+			 "x%x ID %d LUN %llu\n",
+			 SUCCESS, cmnd->device->id, cmnd->device->lun);
+		goto out_unlock_hba;
+	}
+
+	iocb = &lpfc_cmd->cur_iocbq;
+	if (phba->sli_rev == LPFC_SLI_REV4) {
+		pring_s4 = phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring;
+		if (!pring_s4) {
+			ret = FAILED;
+			goto out_unlock_hba;
+		}
+		spin_lock(&pring_s4->ring_lock);
+	}
+	/* the command is in process of being cancelled */
+	if (!(iocb->cmd_flag & LPFC_IO_ON_TXCMPLQ)) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			"3169 SCSI Layer abort requested I/O has been "
+			"cancelled by LLD.\n");
+		ret = FAILED;
+		goto out_unlock_ring;
+	}
+	/*
+	 * If pCmd field of the corresponding lpfc_io_buf structure
+	 * points to a different SCSI command, then the driver has
+	 * already completed this command, but the midlayer did not
+	 * see the completion before the eh fired. Just return SUCCESS.
+	 */
+	if (lpfc_cmd->pCmd != cmnd) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			"3170 SCSI Layer abort requested I/O has been "
+			"completed by LLD.\n");
+		goto out_unlock_ring;
+	}
+
+	WARN_ON(iocb->io_buf != lpfc_cmd);
+
+	/* abort issued in recovery is still in progress */
+	if (iocb->cmd_flag & LPFC_DRIVER_ABORTED) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			 "3389 SCSI Layer I/O Abort Request is pending\n");
+		if (phba->sli_rev == LPFC_SLI_REV4)
+			spin_unlock(&pring_s4->ring_lock);
+		spin_unlock(&phba->hbalock);
+		spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
+		goto wait_for_cmpl;
+	}
+
+	lpfc_cmd->waitq = &waitq;
+	if (phba->sli_rev == LPFC_SLI_REV4) {
+		spin_unlock(&pring_s4->ring_lock);
+		ret_val = lpfc_sli4_issue_abort_iotag(phba, iocb,
+						      lpfc_sli_abort_fcp_cmpl);
+	} else {
+		pring = &phba->sli.sli3_ring[LPFC_FCP_RING];
+		ret_val = lpfc_sli_issue_abort_iotag(phba, pring, iocb,
+						     lpfc_sli_abort_fcp_cmpl);
+	}
+
+	/* Make sure HBA is alive */
+	lpfc_issue_hb_tmo(phba);
+
+	if (ret_val != IOCB_SUCCESS) {
+		/* Indicate the IO is not being aborted by the driver. */
+		lpfc_cmd->waitq = NULL;
+		ret = FAILED;
+		goto out_unlock_hba;
+	}
+
+	/* no longer need the lock after this point */
+	spin_unlock(&phba->hbalock);
+	spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
+
+	if (phba->cfg_poll & DISABLE_FCP_RING_INT)
+		lpfc_sli_handle_fast_ring_event(phba,
+			&phba->sli.sli3_ring[LPFC_FCP_RING], HA_R0RE_REQ);
+
+wait_for_cmpl:
+	/*
+	 * cmd_flag is set to LPFC_DRIVER_ABORTED before we wait
+	 * for abort to complete.
+	 */
+	wait_event_timeout(waitq,
+			  (lpfc_cmd->pCmd != cmnd),
+			   msecs_to_jiffies(2*vport->cfg_devloss_tmo*1000));
+
+	spin_lock(&lpfc_cmd->buf_lock);
+
+	if (lpfc_cmd->pCmd == cmnd) {
+		ret = FAILED;
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "0748 abort handler timed out waiting "
+				 "for aborting I/O (xri:x%x) to complete: "
+				 "ret %#x, ID %d, LUN %llu\n",
+				 iocb->sli4_xritag, ret,
+				 cmnd->device->id, cmnd->device->lun);
+	}
+
+	lpfc_cmd->waitq = NULL;
+
+	spin_unlock(&lpfc_cmd->buf_lock);
+	goto out;
+
+out_unlock_ring:
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		spin_unlock(&pring_s4->ring_lock);
+out_unlock_hba:
+	spin_unlock(&phba->hbalock);
+	spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags);
+out:
+	lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+			 "0749 SCSI Layer I/O Abort Request Status x%x ID %d "
+			 "LUN %llu\n", ret, cmnd->device->id,
+			 cmnd->device->lun);
+	return ret;
+}
+
+static char *
+lpfc_taskmgmt_name(uint8_t task_mgmt_cmd)
+{
+	switch (task_mgmt_cmd) {
+	case FCP_ABORT_TASK_SET:
+		return "ABORT_TASK_SET";
+	case FCP_CLEAR_TASK_SET:
+		return "FCP_CLEAR_TASK_SET";
+	case FCP_BUS_RESET:
+		return "FCP_BUS_RESET";
+	case FCP_LUN_RESET:
+		return "FCP_LUN_RESET";
+	case FCP_TARGET_RESET:
+		return "FCP_TARGET_RESET";
+	case FCP_CLEAR_ACA:
+		return "FCP_CLEAR_ACA";
+	case FCP_TERMINATE_TASK:
+		return "FCP_TERMINATE_TASK";
+	default:
+		return "unknown";
+	}
+}
+
+
+/**
+ * lpfc_check_fcp_rsp - check the returned fcp_rsp to see if task failed
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_io_buf data structure.
+ *
+ * This routine checks the FCP RSP INFO to see if the tsk mgmt command succeded
+ *
+ * Return code :
+ *   0x2003 - Error
+ *   0x2002 - Success
+ **/
+static int
+lpfc_check_fcp_rsp(struct lpfc_vport *vport, struct lpfc_io_buf *lpfc_cmd)
+{
+	struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
+	uint32_t rsp_info;
+	uint32_t rsp_len;
+	uint8_t  rsp_info_code;
+	int ret = FAILED;
+
+
+	if (fcprsp == NULL)
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+				 "0703 fcp_rsp is missing\n");
+	else {
+		rsp_info = fcprsp->rspStatus2;
+		rsp_len = be32_to_cpu(fcprsp->rspRspLen);
+		rsp_info_code = fcprsp->rspInfo3;
+
+
+		lpfc_printf_vlog(vport, KERN_INFO,
+				 LOG_FCP,
+				 "0706 fcp_rsp valid 0x%x,"
+				 " rsp len=%d code 0x%x\n",
+				 rsp_info,
+				 rsp_len, rsp_info_code);
+
+		/* If FCP_RSP_LEN_VALID bit is one, then the FCP_RSP_LEN
+		 * field specifies the number of valid bytes of FCP_RSP_INFO.
+		 * The FCP_RSP_LEN field shall be set to 0x04 or 0x08
+		 */
+		if ((fcprsp->rspStatus2 & RSP_LEN_VALID) &&
+		    ((rsp_len == 8) || (rsp_len == 4))) {
+			switch (rsp_info_code) {
+			case RSP_NO_FAILURE:
+				lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+						 "0715 Task Mgmt No Failure\n");
+				ret = SUCCESS;
+				break;
+			case RSP_TM_NOT_SUPPORTED: /* TM rejected */
+				lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+						 "0716 Task Mgmt Target "
+						"reject\n");
+				break;
+			case RSP_TM_NOT_COMPLETED: /* TM failed */
+				lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+						 "0717 Task Mgmt Target "
+						"failed TM\n");
+				break;
+			case RSP_TM_INVALID_LU: /* TM to invalid LU! */
+				lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+						 "0718 Task Mgmt to invalid "
+						"LUN\n");
+				break;
+			}
+		}
+	}
+	return ret;
+}
+
+
+/**
+ * lpfc_send_taskmgmt - Generic SCSI Task Mgmt Handler
+ * @vport: The virtual port for which this call is being executed.
+ * @rport: Pointer to remote port
+ * @tgt_id: Target ID of remote device.
+ * @lun_id: Lun number for the TMF
+ * @task_mgmt_cmd: type of TMF to send
+ *
+ * This routine builds and sends a TMF (SCSI Task Mgmt Function) to
+ * a remote port.
+ *
+ * Return Code:
+ *   0x2003 - Error
+ *   0x2002 - Success.
+ **/
+static int
+lpfc_send_taskmgmt(struct lpfc_vport *vport, struct fc_rport *rport,
+		   unsigned int tgt_id, uint64_t lun_id,
+		   uint8_t task_mgmt_cmd)
+{
+	struct lpfc_hba   *phba = vport->phba;
+	struct lpfc_io_buf *lpfc_cmd;
+	struct lpfc_iocbq *iocbq;
+	struct lpfc_iocbq *iocbqrsp;
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *pnode;
+	int ret;
+	int status;
+
+	rdata = rport->dd_data;
+	if (!rdata || !rdata->pnode)
+		return FAILED;
+	pnode = rdata->pnode;
+
+	lpfc_cmd = lpfc_get_scsi_buf(phba, rdata->pnode, NULL);
+	if (lpfc_cmd == NULL)
+		return FAILED;
+	lpfc_cmd->timeout = phba->cfg_task_mgmt_tmo;
+	lpfc_cmd->rdata = rdata;
+	lpfc_cmd->pCmd = NULL;
+	lpfc_cmd->ndlp = pnode;
+
+	status = phba->lpfc_scsi_prep_task_mgmt_cmd(vport, lpfc_cmd, lun_id,
+						    task_mgmt_cmd);
+	if (!status) {
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+		return FAILED;
+	}
+
+	iocbq = &lpfc_cmd->cur_iocbq;
+	iocbqrsp = lpfc_sli_get_iocbq(phba);
+	if (iocbqrsp == NULL) {
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+		return FAILED;
+	}
+	iocbq->cmd_cmpl = lpfc_tskmgmt_def_cmpl;
+	iocbq->vport = vport;
+
+	lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+			 "0702 Issue %s to TGT %d LUN %llu "
+			 "rpi x%x nlp_flag x%x Data: x%x x%x\n",
+			 lpfc_taskmgmt_name(task_mgmt_cmd), tgt_id, lun_id,
+			 pnode->nlp_rpi, pnode->nlp_flag, iocbq->sli4_xritag,
+			 iocbq->cmd_flag);
+
+	status = lpfc_sli_issue_iocb_wait(phba, LPFC_FCP_RING,
+					  iocbq, iocbqrsp, lpfc_cmd->timeout);
+	if ((status != IOCB_SUCCESS) ||
+	    (get_job_ulpstatus(phba, iocbqrsp) != IOSTAT_SUCCESS)) {
+		if (status != IOCB_SUCCESS ||
+		    get_job_ulpstatus(phba, iocbqrsp) != IOSTAT_FCP_RSP_ERROR)
+			lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+					 "0727 TMF %s to TGT %d LUN %llu "
+					 "failed (%d, %d) cmd_flag x%x\n",
+					 lpfc_taskmgmt_name(task_mgmt_cmd),
+					 tgt_id, lun_id,
+					 get_job_ulpstatus(phba, iocbqrsp),
+					 get_job_word4(phba, iocbqrsp),
+					 iocbq->cmd_flag);
+		/* if ulpStatus != IOCB_SUCCESS, then status == IOCB_SUCCESS */
+		if (status == IOCB_SUCCESS) {
+			if (get_job_ulpstatus(phba, iocbqrsp) ==
+			    IOSTAT_FCP_RSP_ERROR)
+				/* Something in the FCP_RSP was invalid.
+				 * Check conditions */
+				ret = lpfc_check_fcp_rsp(vport, lpfc_cmd);
+			else
+				ret = FAILED;
+		} else if ((status == IOCB_TIMEDOUT) ||
+			   (status == IOCB_ABORTED)) {
+			ret = TIMEOUT_ERROR;
+		} else {
+			ret = FAILED;
+		}
+	} else
+		ret = SUCCESS;
+
+	lpfc_sli_release_iocbq(phba, iocbqrsp);
+
+	if (status != IOCB_TIMEDOUT)
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+
+	return ret;
+}
+
+/**
+ * lpfc_chk_tgt_mapped -
+ * @vport: The virtual port to check on
+ * @rport: Pointer to fc_rport data structure.
+ *
+ * This routine delays until the scsi target (aka rport) for the
+ * command exists (is present and logged in) or we declare it non-existent.
+ *
+ * Return code :
+ *  0x2003 - Error
+ *  0x2002 - Success
+ **/
+static int
+lpfc_chk_tgt_mapped(struct lpfc_vport *vport, struct fc_rport *rport)
+{
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *pnode = NULL;
+	unsigned long later;
+
+	rdata = rport->dd_data;
+	if (!rdata) {
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
+			"0797 Tgt Map rport failure: rdata x%px\n", rdata);
+		return FAILED;
+	}
+	pnode = rdata->pnode;
+
+	/*
+	 * If target is not in a MAPPED state, delay until
+	 * target is rediscovered or devloss timeout expires.
+	 */
+	later = msecs_to_jiffies(2 * vport->cfg_devloss_tmo * 1000) + jiffies;
+	while (time_after(later, jiffies)) {
+		if (!pnode)
+			return FAILED;
+		if (pnode->nlp_state == NLP_STE_MAPPED_NODE)
+			return SUCCESS;
+		schedule_timeout_uninterruptible(msecs_to_jiffies(500));
+		rdata = rport->dd_data;
+		if (!rdata)
+			return FAILED;
+		pnode = rdata->pnode;
+	}
+	if (!pnode || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
+		return FAILED;
+	return SUCCESS;
+}
+
+/**
+ * lpfc_reset_flush_io_context -
+ * @vport: The virtual port (scsi_host) for the flush context
+ * @tgt_id: If aborting by Target contect - specifies the target id
+ * @lun_id: If aborting by Lun context - specifies the lun id
+ * @context: specifies the context level to flush at.
+ *
+ * After a reset condition via TMF, we need to flush orphaned i/o
+ * contexts from the adapter. This routine aborts any contexts
+ * outstanding, then waits for their completions. The wait is
+ * bounded by devloss_tmo though.
+ *
+ * Return code :
+ *  0x2003 - Error
+ *  0x2002 - Success
+ **/
+static int
+lpfc_reset_flush_io_context(struct lpfc_vport *vport, uint16_t tgt_id,
+			uint64_t lun_id, lpfc_ctx_cmd context)
+{
+	struct lpfc_hba   *phba = vport->phba;
+	unsigned long later;
+	int cnt;
+
+	cnt = lpfc_sli_sum_iocb(vport, tgt_id, lun_id, context);
+	if (cnt)
+		lpfc_sli_abort_taskmgmt(vport,
+					&phba->sli.sli3_ring[LPFC_FCP_RING],
+					tgt_id, lun_id, context);
+	later = msecs_to_jiffies(2 * vport->cfg_devloss_tmo * 1000) + jiffies;
+	while (time_after(later, jiffies) && cnt) {
+		schedule_timeout_uninterruptible(msecs_to_jiffies(20));
+		cnt = lpfc_sli_sum_iocb(vport, tgt_id, lun_id, context);
+	}
+	if (cnt) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+			"0724 I/O flush failure for context %s : cnt x%x\n",
+			((context == LPFC_CTX_LUN) ? "LUN" :
+			 ((context == LPFC_CTX_TGT) ? "TGT" :
+			  ((context == LPFC_CTX_HOST) ? "HOST" : "Unknown"))),
+			cnt);
+		return FAILED;
+	}
+	return SUCCESS;
+}
+
+/**
+ * lpfc_device_reset_handler - scsi_host_template eh_device_reset entry point
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine does a device reset by sending a LUN_RESET task management
+ * command.
+ *
+ * Return code :
+ *  0x2003 - Error
+ *  0x2002 - Success
+ **/
+static int
+lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
+{
+	struct Scsi_Host  *shost = cmnd->device->host;
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+	struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *pnode;
+	unsigned tgt_id = cmnd->device->id;
+	uint64_t lun_id = cmnd->device->lun;
+	struct lpfc_scsi_event_header scsi_event;
+	int status;
+	u32 logit = LOG_FCP;
+
+	if (!rport)
+		return FAILED;
+
+	rdata = rport->dd_data;
+	if (!rdata || !rdata->pnode) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "0798 Device Reset rdata failure: rdata x%px\n",
+				 rdata);
+		return FAILED;
+	}
+	pnode = rdata->pnode;
+	status = fc_block_rport(rport);
+	if (status != 0 && status != SUCCESS)
+		return status;
+
+	status = lpfc_chk_tgt_mapped(vport, rport);
+	if (status == FAILED) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+			"0721 Device Reset rport failure: rdata x%px\n", rdata);
+		return FAILED;
+	}
+
+	scsi_event.event_type = FC_REG_SCSI_EVENT;
+	scsi_event.subcategory = LPFC_EVENT_LUNRESET;
+	scsi_event.lun = lun_id;
+	memcpy(scsi_event.wwpn, &pnode->nlp_portname, sizeof(struct lpfc_name));
+	memcpy(scsi_event.wwnn, &pnode->nlp_nodename, sizeof(struct lpfc_name));
+
+	fc_host_post_vendor_event(shost, fc_get_event_number(),
+		sizeof(scsi_event), (char *)&scsi_event, LPFC_NL_VENDOR_ID);
+
+	status = lpfc_send_taskmgmt(vport, rport, tgt_id, lun_id,
+						FCP_LUN_RESET);
+	if (status != SUCCESS)
+		logit =  LOG_TRACE_EVENT;
+
+	lpfc_printf_vlog(vport, KERN_ERR, logit,
+			 "0713 SCSI layer issued Device Reset (%d, %llu) "
+			 "return x%x\n", tgt_id, lun_id, status);
+
+	/*
+	 * We have to clean up i/o as : they may be orphaned by the TMF;
+	 * or if the TMF failed, they may be in an indeterminate state.
+	 * So, continue on.
+	 * We will report success if all the i/o aborts successfully.
+	 */
+	if (status == SUCCESS)
+		status = lpfc_reset_flush_io_context(vport, tgt_id, lun_id,
+						LPFC_CTX_LUN);
+
+	return status;
+}
+
+/**
+ * lpfc_target_reset_handler - scsi_host_template eh_target_reset entry point
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine does a target reset by sending a TARGET_RESET task management
+ * command.
+ *
+ * Return code :
+ *  0x2003 - Error
+ *  0x2002 - Success
+ **/
+static int
+lpfc_target_reset_handler(struct scsi_cmnd *cmnd)
+{
+	struct Scsi_Host  *shost = cmnd->device->host;
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+	struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+	struct lpfc_rport_data *rdata;
+	struct lpfc_nodelist *pnode;
+	unsigned tgt_id = cmnd->device->id;
+	uint64_t lun_id = cmnd->device->lun;
+	struct lpfc_scsi_event_header scsi_event;
+	int status;
+	u32 logit = LOG_FCP;
+	u32 dev_loss_tmo = vport->cfg_devloss_tmo;
+	unsigned long flags;
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waitq);
+
+	if (!rport)
+		return FAILED;
+
+	rdata = rport->dd_data;
+	if (!rdata || !rdata->pnode) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+				 "0799 Target Reset rdata failure: rdata x%px\n",
+				 rdata);
+		return FAILED;
+	}
+	pnode = rdata->pnode;
+	status = fc_block_rport(rport);
+	if (status != 0 && status != SUCCESS)
+		return status;
+
+	status = lpfc_chk_tgt_mapped(vport, rport);
+	if (status == FAILED) {
+		lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+			"0722 Target Reset rport failure: rdata x%px\n", rdata);
+		if (pnode) {
+			spin_lock_irqsave(&pnode->lock, flags);
+			pnode->nlp_flag &= ~NLP_NPR_ADISC;
+			pnode->nlp_fcp_info &= ~NLP_FCP_2_DEVICE;
+			spin_unlock_irqrestore(&pnode->lock, flags);
+		}
+		lpfc_reset_flush_io_context(vport, tgt_id, lun_id,
+					  LPFC_CTX_TGT);
+		return FAST_IO_FAIL;
+	}
+
+	scsi_event.event_type = FC_REG_SCSI_EVENT;
+	scsi_event.subcategory = LPFC_EVENT_TGTRESET;
+	scsi_event.lun = 0;
+	memcpy(scsi_event.wwpn, &pnode->nlp_portname, sizeof(struct lpfc_name));
+	memcpy(scsi_event.wwnn, &pnode->nlp_nodename, sizeof(struct lpfc_name));
+
+	fc_host_post_vendor_event(shost, fc_get_event_number(),
+		sizeof(scsi_event), (char *)&scsi_event, LPFC_NL_VENDOR_ID);
+
+	status = lpfc_send_taskmgmt(vport, rport, tgt_id, lun_id,
+					FCP_TARGET_RESET);
+	if (status != SUCCESS) {
+		logit = LOG_TRACE_EVENT;
+
+		/* Issue LOGO, if no LOGO is outstanding */
+		spin_lock_irqsave(&pnode->lock, flags);
+		if (!(pnode->save_flags & NLP_WAIT_FOR_LOGO) &&
+		    !pnode->logo_waitq) {
+			pnode->logo_waitq = &waitq;
+			pnode->nlp_fcp_info &= ~NLP_FCP_2_DEVICE;
+			pnode->nlp_flag |= NLP_ISSUE_LOGO;
+			pnode->save_flags |= NLP_WAIT_FOR_LOGO;
+			spin_unlock_irqrestore(&pnode->lock, flags);
+			lpfc_unreg_rpi(vport, pnode);
+			wait_event_timeout(waitq,
+					   (!(pnode->save_flags &
+					      NLP_WAIT_FOR_LOGO)),
+					   msecs_to_jiffies(dev_loss_tmo *
+							    1000));
+
+			if (pnode->save_flags & NLP_WAIT_FOR_LOGO) {
+				lpfc_printf_vlog(vport, KERN_ERR, logit,
+						 "0725 SCSI layer TGTRST "
+						 "failed & LOGO TMO (%d, %llu) "
+						 "return x%x\n",
+						 tgt_id, lun_id, status);
+				spin_lock_irqsave(&pnode->lock, flags);
+				pnode->save_flags &= ~NLP_WAIT_FOR_LOGO;
+			} else {
+				spin_lock_irqsave(&pnode->lock, flags);
+			}
+			pnode->logo_waitq = NULL;
+			spin_unlock_irqrestore(&pnode->lock, flags);
+			status = SUCCESS;
+
+		} else {
+			spin_unlock_irqrestore(&pnode->lock, flags);
+			status = FAILED;
+		}
+	}
+
+	lpfc_printf_vlog(vport, KERN_ERR, logit,
+			 "0723 SCSI layer issued Target Reset (%d, %llu) "
+			 "return x%x\n", tgt_id, lun_id, status);
+
+	/*
+	 * We have to clean up i/o as : they may be orphaned by the TMF;
+	 * or if the TMF failed, they may be in an indeterminate state.
+	 * So, continue on.
+	 * We will report success if all the i/o aborts successfully.
+	 */
+	if (status == SUCCESS)
+		status = lpfc_reset_flush_io_context(vport, tgt_id, lun_id,
+					  LPFC_CTX_TGT);
+	return status;
+}
+
+/**
+ * lpfc_host_reset_handler - scsi_host_template eh_host_reset_handler entry pt
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine does host reset to the adaptor port. It brings the HBA
+ * offline, performs a board restart, and then brings the board back online.
+ * The lpfc_offline calls lpfc_sli_hba_down which will abort and local
+ * reject all outstanding SCSI commands to the host and error returned
+ * back to SCSI mid-level. As this will be SCSI mid-level's last resort
+ * of error handling, it will only return error if resetting of the adapter
+ * is not successful; in all other cases, will return success.
+ *
+ * Return code :
+ *  0x2003 - Error
+ *  0x2002 - Success
+ **/
+static int
+lpfc_host_reset_handler(struct scsi_cmnd *cmnd)
+{
+	struct Scsi_Host *shost = cmnd->device->host;
+	struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+	struct lpfc_hba *phba = vport->phba;
+	int rc, ret = SUCCESS;
+
+	lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
+			 "3172 SCSI layer issued Host Reset Data:\n");
+
+	lpfc_offline_prep(phba, LPFC_MBX_WAIT);
+	lpfc_offline(phba);
+	rc = lpfc_sli_brdrestart(phba);
+	if (rc)
+		goto error;
+
+	/* Wait for successful restart of adapter */
+	if (phba->sli_rev < LPFC_SLI_REV4) {
+		rc = lpfc_sli_chipset_init(phba);
+		if (rc)
+			goto error;
+	}
+
+	rc = lpfc_online(phba);
+	if (rc)
+		goto error;
+
+	lpfc_unblock_mgmt_io(phba);
+
+	return ret;
+error:
+	lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+			 "3323 Failed host reset\n");
+	lpfc_unblock_mgmt_io(phba);
+	return FAILED;
+}
+
+/**
+ * lpfc_slave_alloc - scsi_host_template slave_alloc entry point
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine populates the cmds_per_lun count + 2 scsi_bufs into  this host's
+ * globally available list of scsi buffers. This routine also makes sure scsi
+ * buffer is not allocated more than HBA limit conveyed to midlayer. This list
+ * of scsi buffer exists for the lifetime of the driver.
+ *
+ * Return codes:
+ *   non-0 - Error
+ *   0 - Success
+ **/
+static int
+lpfc_slave_alloc(struct scsi_device *sdev)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+	uint32_t total = 0;
+	uint32_t num_to_alloc = 0;
+	int num_allocated = 0;
+	uint32_t sdev_cnt;
+	struct lpfc_device_data *device_data;
+	unsigned long flags;
+	struct lpfc_name target_wwpn;
+
+	if (!rport || fc_remote_port_chkready(rport))
+		return -ENXIO;
+
+	if (phba->cfg_fof) {
+
+		/*
+		 * Check to see if the device data structure for the lun
+		 * exists.  If not, create one.
+		 */
+
+		u64_to_wwn(rport->port_name, target_wwpn.u.wwn);
+		spin_lock_irqsave(&phba->devicelock, flags);
+		device_data = __lpfc_get_device_data(phba,
+						     &phba->luns,
+						     &vport->fc_portname,
+						     &target_wwpn,
+						     sdev->lun);
+		if (!device_data) {
+			spin_unlock_irqrestore(&phba->devicelock, flags);
+			device_data = lpfc_create_device_data(phba,
+							&vport->fc_portname,
+							&target_wwpn,
+							sdev->lun,
+							phba->cfg_XLanePriority,
+							true);
+			if (!device_data)
+				return -ENOMEM;
+			spin_lock_irqsave(&phba->devicelock, flags);
+			list_add_tail(&device_data->listentry, &phba->luns);
+		}
+		device_data->rport_data = rport->dd_data;
+		device_data->available = true;
+		spin_unlock_irqrestore(&phba->devicelock, flags);
+		sdev->hostdata = device_data;
+	} else {
+		sdev->hostdata = rport->dd_data;
+	}
+	sdev_cnt = atomic_inc_return(&phba->sdev_cnt);
+
+	/* For SLI4, all IO buffers are pre-allocated */
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		return 0;
+
+	/* This code path is now ONLY for SLI3 adapters */
+
+	/*
+	 * Populate the cmds_per_lun count scsi_bufs into this host's globally
+	 * available list of scsi buffers.  Don't allocate more than the
+	 * HBA limit conveyed to the midlayer via the host structure.  The
+	 * formula accounts for the lun_queue_depth + error handlers + 1
+	 * extra.  This list of scsi bufs exists for the lifetime of the driver.
+	 */
+	total = phba->total_scsi_bufs;
+	num_to_alloc = vport->cfg_lun_queue_depth + 2;
+
+	/* If allocated buffers are enough do nothing */
+	if ((sdev_cnt * (vport->cfg_lun_queue_depth + 2)) < total)
+		return 0;
+
+	/* Allow some exchanges to be available always to complete discovery */
+	if (total >= phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+				 "0704 At limitation of %d preallocated "
+				 "command buffers\n", total);
+		return 0;
+	/* Allow some exchanges to be available always to complete discovery */
+	} else if (total + num_to_alloc >
+		phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
+		lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
+				 "0705 Allocation request of %d "
+				 "command buffers will exceed max of %d.  "
+				 "Reducing allocation request to %d.\n",
+				 num_to_alloc, phba->cfg_hba_queue_depth,
+				 (phba->cfg_hba_queue_depth - total));
+		num_to_alloc = phba->cfg_hba_queue_depth - total;
+	}
+	num_allocated = lpfc_new_scsi_buf_s3(vport, num_to_alloc);
+	if (num_to_alloc != num_allocated) {
+			lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
+					 "0708 Allocation request of %d "
+					 "command buffers did not succeed.  "
+					 "Allocated %d buffers.\n",
+					 num_to_alloc, num_allocated);
+	}
+	if (num_allocated > 0)
+		phba->total_scsi_bufs += num_allocated;
+	return 0;
+}
+
+/**
+ * lpfc_slave_configure - scsi_host_template slave_configure entry point
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine configures following items
+ *   - Tag command queuing support for @sdev if supported.
+ *   - Enable SLI polling for fcp ring if ENABLE_FCP_RING_POLLING flag is set.
+ *
+ * Return codes:
+ *   0 - Success
+ **/
+static int
+lpfc_slave_configure(struct scsi_device *sdev)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+
+	scsi_change_queue_depth(sdev, vport->cfg_lun_queue_depth);
+
+	if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+		lpfc_sli_handle_fast_ring_event(phba,
+			&phba->sli.sli3_ring[LPFC_FCP_RING], HA_R0RE_REQ);
+		if (phba->cfg_poll & DISABLE_FCP_RING_INT)
+			lpfc_poll_rearm_timer(phba);
+	}
+
+	return 0;
+}
+
+/**
+ * lpfc_slave_destroy - slave_destroy entry point of SHT data structure
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine sets @sdev hostatdata filed to null.
+ **/
+static void
+lpfc_slave_destroy(struct scsi_device *sdev)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+	unsigned long flags;
+	struct lpfc_device_data *device_data = sdev->hostdata;
+
+	atomic_dec(&phba->sdev_cnt);
+	if ((phba->cfg_fof) && (device_data)) {
+		spin_lock_irqsave(&phba->devicelock, flags);
+		device_data->available = false;
+		if (!device_data->oas_enabled)
+			lpfc_delete_device_data(phba, device_data);
+		spin_unlock_irqrestore(&phba->devicelock, flags);
+	}
+	sdev->hostdata = NULL;
+	return;
+}
+
+/**
+ * lpfc_create_device_data - creates and initializes device data structure for OAS
+ * @phba: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun on target
+ * @pri: Priority
+ * @atomic_create: Flag to indicate if memory should be allocated using the
+ *		  GFP_ATOMIC flag or not.
+ *
+ * This routine creates a device data structure which will contain identifying
+ * information for the device (host wwpn, target wwpn, lun), state of OAS,
+ * whether or not the corresponding lun is available by the system,
+ * and pointer to the rport data.
+ *
+ * Return codes:
+ *   NULL - Error
+ *   Pointer to lpfc_device_data - Success
+ **/
+struct lpfc_device_data*
+lpfc_create_device_data(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+			struct lpfc_name *target_wwpn, uint64_t lun,
+			uint32_t pri, bool atomic_create)
+{
+
+	struct lpfc_device_data *lun_info;
+	int memory_flags;
+
+	if (unlikely(!phba) || !vport_wwpn || !target_wwpn  ||
+	    !(phba->cfg_fof))
+		return NULL;
+
+	/* Attempt to create the device data to contain lun info */
+
+	if (atomic_create)
+		memory_flags = GFP_ATOMIC;
+	else
+		memory_flags = GFP_KERNEL;
+	lun_info = mempool_alloc(phba->device_data_mem_pool, memory_flags);
+	if (!lun_info)
+		return NULL;
+	INIT_LIST_HEAD(&lun_info->listentry);
+	lun_info->rport_data  = NULL;
+	memcpy(&lun_info->device_id.vport_wwpn, vport_wwpn,
+	       sizeof(struct lpfc_name));
+	memcpy(&lun_info->device_id.target_wwpn, target_wwpn,
+	       sizeof(struct lpfc_name));
+	lun_info->device_id.lun = lun;
+	lun_info->oas_enabled = false;
+	lun_info->priority = pri;
+	lun_info->available = false;
+	return lun_info;
+}
+
+/**
+ * lpfc_delete_device_data - frees a device data structure for OAS
+ * @phba: Pointer to host bus adapter structure.
+ * @lun_info: Pointer to device data structure to free.
+ *
+ * This routine frees the previously allocated device data structure passed.
+ *
+ **/
+void
+lpfc_delete_device_data(struct lpfc_hba *phba,
+			struct lpfc_device_data *lun_info)
+{
+
+	if (unlikely(!phba) || !lun_info  ||
+	    !(phba->cfg_fof))
+		return;
+
+	if (!list_empty(&lun_info->listentry))
+		list_del(&lun_info->listentry);
+	mempool_free(lun_info, phba->device_data_mem_pool);
+	return;
+}
+
+/**
+ * __lpfc_get_device_data - returns the device data for the specified lun
+ * @phba: Pointer to host bus adapter structure.
+ * @list: Point to list to search.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun on target
+ *
+ * This routine searches the list passed for the specified lun's device data.
+ * This function does not hold locks, it is the responsibility of the caller
+ * to ensure the proper lock is held before calling the function.
+ *
+ * Return codes:
+ *   NULL - Error
+ *   Pointer to lpfc_device_data - Success
+ **/
+struct lpfc_device_data*
+__lpfc_get_device_data(struct lpfc_hba *phba, struct list_head *list,
+		       struct lpfc_name *vport_wwpn,
+		       struct lpfc_name *target_wwpn, uint64_t lun)
+{
+
+	struct lpfc_device_data *lun_info;
+
+	if (unlikely(!phba) || !list || !vport_wwpn || !target_wwpn ||
+	    !phba->cfg_fof)
+		return NULL;
+
+	/* Check to see if the lun is already enabled for OAS. */
+
+	list_for_each_entry(lun_info, list, listentry) {
+		if ((memcmp(&lun_info->device_id.vport_wwpn, vport_wwpn,
+			    sizeof(struct lpfc_name)) == 0) &&
+		    (memcmp(&lun_info->device_id.target_wwpn, target_wwpn,
+			    sizeof(struct lpfc_name)) == 0) &&
+		    (lun_info->device_id.lun == lun))
+			return lun_info;
+	}
+
+	return NULL;
+}
+
+/**
+ * lpfc_find_next_oas_lun - searches for the next oas lun
+ * @phba: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @starting_lun: Pointer to the lun to start searching for
+ * @found_vport_wwpn: Pointer to the found lun's vport wwpn information
+ * @found_target_wwpn: Pointer to the found lun's target wwpn information
+ * @found_lun: Pointer to the found lun.
+ * @found_lun_status: Pointer to status of the found lun.
+ * @found_lun_pri: Pointer to priority of the found lun.
+ *
+ * This routine searches the luns list for the specified lun
+ * or the first lun for the vport/target.  If the vport wwpn contains
+ * a zero value then a specific vport is not specified. In this case
+ * any vport which contains the lun will be considered a match.  If the
+ * target wwpn contains a zero value then a specific target is not specified.
+ * In this case any target which contains the lun will be considered a
+ * match.  If the lun is found, the lun, vport wwpn, target wwpn and lun status
+ * are returned.  The function will also return the next lun if available.
+ * If the next lun is not found, starting_lun parameter will be set to
+ * NO_MORE_OAS_LUN.
+ *
+ * Return codes:
+ *   non-0 - Error
+ *   0 - Success
+ **/
+bool
+lpfc_find_next_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+		       struct lpfc_name *target_wwpn, uint64_t *starting_lun,
+		       struct lpfc_name *found_vport_wwpn,
+		       struct lpfc_name *found_target_wwpn,
+		       uint64_t *found_lun,
+		       uint32_t *found_lun_status,
+		       uint32_t *found_lun_pri)
+{
+
+	unsigned long flags;
+	struct lpfc_device_data *lun_info;
+	struct lpfc_device_id *device_id;
+	uint64_t lun;
+	bool found = false;
+
+	if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+	    !starting_lun || !found_vport_wwpn ||
+	    !found_target_wwpn || !found_lun || !found_lun_status ||
+	    (*starting_lun == NO_MORE_OAS_LUN) ||
+	    !phba->cfg_fof)
+		return false;
+
+	lun = *starting_lun;
+	*found_lun = NO_MORE_OAS_LUN;
+	*starting_lun = NO_MORE_OAS_LUN;
+
+	/* Search for lun or the lun closet in value */
+
+	spin_lock_irqsave(&phba->devicelock, flags);
+	list_for_each_entry(lun_info, &phba->luns, listentry) {
+		if (((wwn_to_u64(vport_wwpn->u.wwn) == 0) ||
+		     (memcmp(&lun_info->device_id.vport_wwpn, vport_wwpn,
+			    sizeof(struct lpfc_name)) == 0)) &&
+		    ((wwn_to_u64(target_wwpn->u.wwn) == 0) ||
+		     (memcmp(&lun_info->device_id.target_wwpn, target_wwpn,
+			    sizeof(struct lpfc_name)) == 0)) &&
+		    (lun_info->oas_enabled)) {
+			device_id = &lun_info->device_id;
+			if ((!found) &&
+			    ((lun == FIND_FIRST_OAS_LUN) ||
+			     (device_id->lun == lun))) {
+				*found_lun = device_id->lun;
+				memcpy(found_vport_wwpn,
+				       &device_id->vport_wwpn,
+				       sizeof(struct lpfc_name));
+				memcpy(found_target_wwpn,
+				       &device_id->target_wwpn,
+				       sizeof(struct lpfc_name));
+				if (lun_info->available)
+					*found_lun_status =
+						OAS_LUN_STATUS_EXISTS;
+				else
+					*found_lun_status = 0;
+				*found_lun_pri = lun_info->priority;
+				if (phba->cfg_oas_flags & OAS_FIND_ANY_VPORT)
+					memset(vport_wwpn, 0x0,
+					       sizeof(struct lpfc_name));
+				if (phba->cfg_oas_flags & OAS_FIND_ANY_TARGET)
+					memset(target_wwpn, 0x0,
+					       sizeof(struct lpfc_name));
+				found = true;
+			} else if (found) {
+				*starting_lun = device_id->lun;
+				memcpy(vport_wwpn, &device_id->vport_wwpn,
+				       sizeof(struct lpfc_name));
+				memcpy(target_wwpn, &device_id->target_wwpn,
+				       sizeof(struct lpfc_name));
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&phba->devicelock, flags);
+	return found;
+}
+
+/**
+ * lpfc_enable_oas_lun - enables a lun for OAS operations
+ * @phba: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun
+ * @pri: Priority
+ *
+ * This routine enables a lun for oas operations.  The routines does so by
+ * doing the following :
+ *
+ *   1) Checks to see if the device data for the lun has been created.
+ *   2) If found, sets the OAS enabled flag if not set and returns.
+ *   3) Otherwise, creates a device data structure.
+ *   4) If successfully created, indicates the device data is for an OAS lun,
+ *   indicates the lun is not available and add to the list of luns.
+ *
+ * Return codes:
+ *   false - Error
+ *   true - Success
+ **/
+bool
+lpfc_enable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+		    struct lpfc_name *target_wwpn, uint64_t lun, uint8_t pri)
+{
+
+	struct lpfc_device_data *lun_info;
+	unsigned long flags;
+
+	if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+	    !phba->cfg_fof)
+		return false;
+
+	spin_lock_irqsave(&phba->devicelock, flags);
+
+	/* Check to see if the device data for the lun has been created */
+	lun_info = __lpfc_get_device_data(phba, &phba->luns, vport_wwpn,
+					  target_wwpn, lun);
+	if (lun_info) {
+		if (!lun_info->oas_enabled)
+			lun_info->oas_enabled = true;
+		lun_info->priority = pri;
+		spin_unlock_irqrestore(&phba->devicelock, flags);
+		return true;
+	}
+
+	/* Create an lun info structure and add to list of luns */
+	lun_info = lpfc_create_device_data(phba, vport_wwpn, target_wwpn, lun,
+					   pri, true);
+	if (lun_info) {
+		lun_info->oas_enabled = true;
+		lun_info->priority = pri;
+		lun_info->available = false;
+		list_add_tail(&lun_info->listentry, &phba->luns);
+		spin_unlock_irqrestore(&phba->devicelock, flags);
+		return true;
+	}
+	spin_unlock_irqrestore(&phba->devicelock, flags);
+	return false;
+}
+
+/**
+ * lpfc_disable_oas_lun - disables a lun for OAS operations
+ * @phba: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun
+ * @pri: Priority
+ *
+ * This routine disables a lun for oas operations.  The routines does so by
+ * doing the following :
+ *
+ *   1) Checks to see if the device data for the lun is created.
+ *   2) If present, clears the flag indicating this lun is for OAS.
+ *   3) If the lun is not available by the system, the device data is
+ *   freed.
+ *
+ * Return codes:
+ *   false - Error
+ *   true - Success
+ **/
+bool
+lpfc_disable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+		     struct lpfc_name *target_wwpn, uint64_t lun, uint8_t pri)
+{
+
+	struct lpfc_device_data *lun_info;
+	unsigned long flags;
+
+	if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+	    !phba->cfg_fof)
+		return false;
+
+	spin_lock_irqsave(&phba->devicelock, flags);
+
+	/* Check to see if the lun is available. */
+	lun_info = __lpfc_get_device_data(phba,
+					  &phba->luns, vport_wwpn,
+					  target_wwpn, lun);
+	if (lun_info) {
+		lun_info->oas_enabled = false;
+		lun_info->priority = pri;
+		if (!lun_info->available)
+			lpfc_delete_device_data(phba, lun_info);
+		spin_unlock_irqrestore(&phba->devicelock, flags);
+		return true;
+	}
+
+	spin_unlock_irqrestore(&phba->devicelock, flags);
+	return false;
+}
+
+static int
+lpfc_no_command(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
+{
+	return SCSI_MLQUEUE_HOST_BUSY;
+}
+
+static int
+lpfc_no_slave(struct scsi_device *sdev)
+{
+	return -ENODEV;
+}
+
+struct scsi_host_template lpfc_template_nvme = {
+	.module			= THIS_MODULE,
+	.name			= LPFC_DRIVER_NAME,
+	.proc_name		= LPFC_DRIVER_NAME,
+	.info			= lpfc_info,
+	.queuecommand		= lpfc_no_command,
+	.slave_alloc		= lpfc_no_slave,
+	.slave_configure	= lpfc_no_slave,
+	.scan_finished		= lpfc_scan_finished,
+	.this_id		= -1,
+	.sg_tablesize		= 1,
+	.cmd_per_lun		= 1,
+	.shost_groups		= lpfc_hba_groups,
+	.max_sectors		= 0xFFFFFFFF,
+	.vendor_id		= LPFC_NL_VENDOR_ID,
+	.track_queue_depth	= 0,
+};
+
+struct scsi_host_template lpfc_template = {
+	.module			= THIS_MODULE,
+	.name			= LPFC_DRIVER_NAME,
+	.proc_name		= LPFC_DRIVER_NAME,
+	.info			= lpfc_info,
+	.queuecommand		= lpfc_queuecommand,
+	.eh_timed_out		= fc_eh_timed_out,
+	.eh_should_retry_cmd    = fc_eh_should_retry_cmd,
+	.eh_abort_handler	= lpfc_abort_handler,
+	.eh_device_reset_handler = lpfc_device_reset_handler,
+	.eh_target_reset_handler = lpfc_target_reset_handler,
+	.eh_host_reset_handler  = lpfc_host_reset_handler,
+	.slave_alloc		= lpfc_slave_alloc,
+	.slave_configure	= lpfc_slave_configure,
+	.slave_destroy		= lpfc_slave_destroy,
+	.scan_finished		= lpfc_scan_finished,
+	.this_id		= -1,
+	.sg_tablesize		= LPFC_DEFAULT_SG_SEG_CNT,
+	.cmd_per_lun		= LPFC_CMD_PER_LUN,
+	.shost_groups		= lpfc_hba_groups,
+	.max_sectors		= 0xFFFFFFFF,
+	.vendor_id		= LPFC_NL_VENDOR_ID,
+	.change_queue_depth	= scsi_change_queue_depth,
+	.track_queue_depth	= 1,
+};
+
+struct scsi_host_template lpfc_vport_template = {
+	.module			= THIS_MODULE,
+	.name			= LPFC_DRIVER_NAME,
+	.proc_name		= LPFC_DRIVER_NAME,
+	.info			= lpfc_info,
+	.queuecommand		= lpfc_queuecommand,
+	.eh_timed_out		= fc_eh_timed_out,
+	.eh_should_retry_cmd    = fc_eh_should_retry_cmd,
+	.eh_abort_handler	= lpfc_abort_handler,
+	.eh_device_reset_handler = lpfc_device_reset_handler,
+	.eh_target_reset_handler = lpfc_target_reset_handler,
+	.eh_bus_reset_handler	= NULL,
+	.eh_host_reset_handler	= NULL,
+	.slave_alloc		= lpfc_slave_alloc,
+	.slave_configure	= lpfc_slave_configure,
+	.slave_destroy		= lpfc_slave_destroy,
+	.scan_finished		= lpfc_scan_finished,
+	.this_id		= -1,
+	.sg_tablesize		= LPFC_DEFAULT_SG_SEG_CNT,
+	.cmd_per_lun		= LPFC_CMD_PER_LUN,
+	.shost_groups		= lpfc_vport_groups,
+	.max_sectors		= 0xFFFFFFFF,
+	.vendor_id		= 0,
+	.change_queue_depth	= scsi_change_queue_depth,
+	.track_queue_depth	= 1,
+};