/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2014 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"
#include "qla_target.h"

#include <linux/blkdev.h>
#include <linux/delay.h>

#include <scsi/scsi_tcq.h>

/**
 * qla2x00_get_cmd_direction() - Determine control_flag data direction.
 * @sp: SCSI command
 *
 * Returns the proper CF_* direction based on CDB.
 */
static inline uint16_t
qla2x00_get_cmd_direction(srb_t *sp)
{
        uint16_t cflags;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host *vha = sp->vha;

        cflags = 0;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cflags = CF_WRITE;
                vha->qla_stats.output_bytes += scsi_bufflen(cmd);
                vha->qla_stats.output_requests++;
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cflags = CF_READ;
                vha->qla_stats.input_bytes += scsi_bufflen(cmd);
                vha->qla_stats.input_requests++;
        }
        return (cflags);
}

/**
 * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
 * Continuation Type 0 IOCBs to allocate.
 *
 * @dsds: number of data segment decriptors needed
 *
 * Returns the number of IOCB entries needed to store @dsds.
 */
uint16_t
qla2x00_calc_iocbs_32(uint16_t dsds)
{
        uint16_t iocbs;

        iocbs = 1;
        if (dsds > 3) {
                iocbs += (dsds - 3) / 7;
                if ((dsds - 3) % 7)
                        iocbs++;
        }
        return (iocbs);
}

/**
 * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
 * Continuation Type 1 IOCBs to allocate.
 *
 * @dsds: number of data segment decriptors needed
 *
 * Returns the number of IOCB entries needed to store @dsds.
 */
uint16_t
qla2x00_calc_iocbs_64(uint16_t dsds)
{
        uint16_t iocbs;

        iocbs = 1;
        if (dsds > 2) {
                iocbs += (dsds - 2) / 5;
                if ((dsds - 2) % 5)
                        iocbs++;
        }
        return (iocbs);
}

/**
 * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
 * @vha: HA context
 *
 * Returns a pointer to the Continuation Type 0 IOCB packet.
 */
static inline cont_entry_t *
qla2x00_prep_cont_type0_iocb(struct scsi_qla_host *vha)
{
        cont_entry_t *cont_pkt;
        struct req_que *req = vha->req;
        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else {
                req->ring_ptr++;
        }

        cont_pkt = (cont_entry_t *)req->ring_ptr;

        /* Load packet defaults. */
        put_unaligned_le32(CONTINUE_TYPE, &cont_pkt->entry_type);

        return (cont_pkt);
}

/**
 * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 * @vha: HA context
 * @req: request queue
 *
 * Returns a pointer to the continuation type 1 IOCB packet.
 */
static inline cont_a64_entry_t *
qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *vha, struct req_que *req)
{
        cont_a64_entry_t *cont_pkt;

        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else {
                req->ring_ptr++;
        }

        cont_pkt = (cont_a64_entry_t *)req->ring_ptr;

        /* Load packet defaults. */
        put_unaligned_le32(IS_QLAFX00(vha->hw) ? CONTINUE_A64_TYPE_FX00 :
                           CONTINUE_A64_TYPE, &cont_pkt->entry_type);

        return (cont_pkt);
}

inline int
qla24xx_configure_prot_mode(srb_t *sp, uint16_t *fw_prot_opts)
{
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        uint8_t guard = scsi_host_get_guard(cmd->device->host);

        /* We always use DIFF Bundling for best performance */
        *fw_prot_opts = 0;

        /* Translate SCSI opcode to a protection opcode */
        switch (scsi_get_prot_op(cmd)) {
        case SCSI_PROT_READ_STRIP:
                *fw_prot_opts |= PO_MODE_DIF_REMOVE;
                break;
        case SCSI_PROT_WRITE_INSERT:
                *fw_prot_opts |= PO_MODE_DIF_INSERT;
                break;
        case SCSI_PROT_READ_INSERT:
                *fw_prot_opts |= PO_MODE_DIF_INSERT;
                break;
        case SCSI_PROT_WRITE_STRIP:
                *fw_prot_opts |= PO_MODE_DIF_REMOVE;
                break;
        case SCSI_PROT_READ_PASS:
        case SCSI_PROT_WRITE_PASS:
                if (guard & SHOST_DIX_GUARD_IP)
                        *fw_prot_opts |= PO_MODE_DIF_TCP_CKSUM;
                else
                        *fw_prot_opts |= PO_MODE_DIF_PASS;
                break;
        default:        /* Normal Request */
                *fw_prot_opts |= PO_MODE_DIF_PASS;
                break;
        }

        return scsi_prot_sg_count(cmd);
}

/*
 * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 * capable IOCB types.
 *
 * @sp: SRB command to process
 * @cmd_pkt: Command type 2 IOCB
 * @tot_dsds: Total number of segments to transfer
 */
void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
    uint16_t tot_dsds)
{
        uint16_t        avail_dsds;
        struct dsd32    *cur_dsd;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        struct scatterlist *sg;
        int i;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type 2 IOCB */
        put_unaligned_le32(COMMAND_TYPE, &cmd_pkt->entry_type);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return;
        }

        vha = sp->vha;
        cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));

        /* Three DSDs are available in the Command Type 2 IOCB */
        avail_dsds = ARRAY_SIZE(cmd_pkt->dsd32);
        cur_dsd = cmd_pkt->dsd32;

        /* Load data segments */
        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                cont_entry_t *cont_pkt;

                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        /*
                         * Seven DSDs are available in the Continuation
                         * Type 0 IOCB.
                         */
                        cont_pkt = qla2x00_prep_cont_type0_iocb(vha);
                        cur_dsd = cont_pkt->dsd;
                        avail_dsds = ARRAY_SIZE(cont_pkt->dsd);
                }

                append_dsd32(&cur_dsd, sg);
                avail_dsds--;
        }
}

/**
 * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
 * capable IOCB types.
 *
 * @sp: SRB command to process
 * @cmd_pkt: Command type 3 IOCB
 * @tot_dsds: Total number of segments to transfer
 */
void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
    uint16_t tot_dsds)
{
        uint16_t        avail_dsds;
        struct dsd64    *cur_dsd;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        struct scatterlist *sg;
        int i;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type 3 IOCB */
        put_unaligned_le32(COMMAND_A64_TYPE, &cmd_pkt->entry_type);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return;
        }

        vha = sp->vha;
        cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));

        /* Two DSDs are available in the Command Type 3 IOCB */
        avail_dsds = ARRAY_SIZE(cmd_pkt->dsd64);
        cur_dsd = cmd_pkt->dsd64;

        /* Load data segments */
        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                cont_a64_entry_t *cont_pkt;

                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        /*
                         * Five DSDs are available in the Continuation
                         * Type 1 IOCB.
                         */
                        cont_pkt = qla2x00_prep_cont_type1_iocb(vha, vha->req);
                        cur_dsd = cont_pkt->dsd;
                        avail_dsds = ARRAY_SIZE(cont_pkt->dsd);
                }

                append_dsd64(&cur_dsd, sg);
                avail_dsds--;
        }
}

/*
 * Find the first handle that is not in use, starting from
 * req->current_outstanding_cmd + 1. The caller must hold the lock that is
 * associated with @req.
 */
uint32_t qla2xxx_get_next_handle(struct req_que *req)
{
        uint32_t index, handle = req->current_outstanding_cmd;

        for (index = 1; index < req->num_outstanding_cmds; index++) {
                handle++;
                if (handle == req->num_outstanding_cmds)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        return handle;
        }

        return 0;
}

/**
 * qla2x00_start_scsi() - Send a SCSI command to the ISP
 * @sp: command to send to the ISP
 *
 * Returns non-zero if a failure occurred, else zero.
 */
int
qla2x00_start_scsi(srb_t *sp)
{
        int             nseg;
        unsigned long   flags;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        uint32_t        *clr_ptr;
        uint32_t        handle;
        cmd_entry_t     *cmd_pkt;
        uint16_t        cnt;
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct device_reg_2xxx __iomem *reg;
        struct qla_hw_data *ha;
        struct req_que *req;
        struct rsp_que *rsp;

        /* Setup device pointers. */
        vha = sp->vha;
        ha = vha->hw;
        reg = &ha->iobase->isp;
        cmd = GET_CMD_SP(sp);
        req = ha->req_q_map[0];
        rsp = ha->rsp_q_map[0];
        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (qla2x00_marker(vha, ha->base_qpair, 0, 0, MK_SYNC_ALL) !=
                    QLA_SUCCESS) {
                        return (QLA_FUNCTION_FAILED);
                }
                vha->marker_needed = 0;
        }

        /* Acquire ring specific lock */
        spin_lock_irqsave(&ha->hardware_lock, flags);

        handle = qla2xxx_get_next_handle(req);
        if (handle == 0)
                goto queuing_error;

        /* Map the sg table so we have an accurate count of sg entries needed */
        if (scsi_sg_count(cmd)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
                    scsi_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
        } else
                nseg = 0;

        tot_dsds = nseg;

        /* Calculate the number of request entries needed. */
        req_cnt = ha->isp_ops->calc_req_entries(tot_dsds);
        if (req->cnt < (req_cnt + 2)) {
                cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
                if (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                            (req->ring_index - cnt);
                /* If still no head room then bail out */
                if (req->cnt < (req_cnt + 2))
                        goto queuing_error;
        }

        /* Build command packet */
        req->current_outstanding_cmd = handle;
        req->outstanding_cmds[handle] = sp;
        sp->handle = handle;
        cmd->host_scribble = (unsigned char *)(unsigned long)handle;
        req->cnt -= req_cnt;

        cmd_pkt = (cmd_entry_t *)req->ring_ptr;
        cmd_pkt->handle = handle;
        /* Zero out remaining portion of packet. */
        clr_ptr = (uint32_t *)cmd_pkt + 2;
        memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
        cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);

        /* Set target ID and LUN number*/
        SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
        cmd_pkt->lun = cpu_to_le16(cmd->device->lun);
        cmd_pkt->control_flags = cpu_to_le16(CF_SIMPLE_TAG);

        /* Load SCSI command packet. */
        memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
        cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));

        /* Build IOCB segments */
        ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);

        /* Set total data segment count. */
        cmd_pkt->entry_count = (uint8_t)req_cnt;
        wmb();

        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else
                req->ring_ptr++;

        sp->flags |= SRB_DMA_VALID;

        /* Set chip new ring index. */
        WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), req->ring_index);
        RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */

        /* Manage unprocessed RIO/ZIO commands in response queue. */
        if (vha->flags.process_response_queue &&
            rsp->ring_ptr->signature != RESPONSE_PROCESSED)
                qla2x00_process_response_queue(rsp);

        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return (QLA_SUCCESS);

queuing_error:
        if (tot_dsds)
                scsi_dma_unmap(cmd);

        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return (QLA_FUNCTION_FAILED);
}

/**
 * qla2x00_start_iocbs() - Execute the IOCB command
 * @vha: HA context
 * @req: request queue
 */
void
qla2x00_start_iocbs(struct scsi_qla_host *vha, struct req_que *req)
{
        struct qla_hw_data *ha = vha->hw;
        device_reg_t *reg = ISP_QUE_REG(ha, req->id);

        if (IS_P3P_TYPE(ha)) {
                qla82xx_start_iocbs(vha);
        } else {
                /* Adjust ring index. */
                req->ring_index++;
                if (req->ring_index == req->length) {
                        req->ring_index = 0;
                        req->ring_ptr = req->ring;
                } else
                        req->ring_ptr++;

                /* Set chip new ring index. */
                if (ha->mqenable || IS_QLA27XX(ha) || IS_QLA28XX(ha)) {
                        WRT_REG_DWORD(req->req_q_in, req->ring_index);
                } else if (IS_QLA83XX(ha)) {
                        WRT_REG_DWORD(req->req_q_in, req->ring_index);
                        RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
                } else if (IS_QLAFX00(ha)) {
                        WRT_REG_DWORD(&reg->ispfx00.req_q_in, req->ring_index);
                        RD_REG_DWORD_RELAXED(&reg->ispfx00.req_q_in);
                        QLAFX00_SET_HST_INTR(ha, ha->rqstq_intr_code);
                } else if (IS_FWI2_CAPABLE(ha)) {
                        WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
                        RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
                } else {
                        WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
                                req->ring_index);
                        RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
                }
        }
}

/**
 * qla2x00_marker() - Send a marker IOCB to the firmware.
 * @vha: HA context
 * @qpair: queue pair pointer
 * @loop_id: loop ID
 * @lun: LUN
 * @type: marker modifier
 *
 * Can be called from both normal and interrupt context.
 *
 * Returns non-zero if a failure occurred, else zero.
 */
static int
__qla2x00_marker(struct scsi_qla_host *vha, struct qla_qpair *qpair,
    uint16_t loop_id, uint64_t lun, uint8_t type)
{
        mrk_entry_t *mrk;
        struct mrk_entry_24xx *mrk24 = NULL;
        struct req_que *req = qpair->req;
        struct qla_hw_data *ha = vha->hw;
        scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);

        mrk = (mrk_entry_t *)__qla2x00_alloc_iocbs(qpair, NULL);
        if (mrk == NULL) {
                ql_log(ql_log_warn, base_vha, 0x3026,
                    "Failed to allocate Marker IOCB.\n");

                return (QLA_FUNCTION_FAILED);
        }

        mrk->entry_type = MARKER_TYPE;
        mrk->modifier = type;
        if (type != MK_SYNC_ALL) {
                if (IS_FWI2_CAPABLE(ha)) {
                        mrk24 = (struct mrk_entry_24xx *) mrk;
                        mrk24->nport_handle = cpu_to_le16(loop_id);
                        int_to_scsilun(lun, (struct scsi_lun *)&mrk24->lun);
                        host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
                        mrk24->vp_index = vha->vp_idx;
                        mrk24->handle = MAKE_HANDLE(req->id, mrk24->handle);
                } else {
                        SET_TARGET_ID(ha, mrk->target, loop_id);
                        mrk->lun = cpu_to_le16((uint16_t)lun);
                }
        }
        wmb();

        qla2x00_start_iocbs(vha, req);

        return (QLA_SUCCESS);
}

int
qla2x00_marker(struct scsi_qla_host *vha, struct qla_qpair *qpair,
    uint16_t loop_id, uint64_t lun, uint8_t type)
{
        int ret;
        unsigned long flags = 0;

        spin_lock_irqsave(qpair->qp_lock_ptr, flags);
        ret = __qla2x00_marker(vha, qpair, loop_id, lun, type);
        spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);

        return (ret);
}

/*
 * qla2x00_issue_marker
 *
 * Issue marker
 * Caller CAN have hardware lock held as specified by ha_locked parameter.
 * Might release it, then reaquire.
 */
int qla2x00_issue_marker(scsi_qla_host_t *vha, int ha_locked)
{
        if (ha_locked) {
                if (__qla2x00_marker(vha, vha->hw->base_qpair, 0, 0,
                                        MK_SYNC_ALL) != QLA_SUCCESS)
                        return QLA_FUNCTION_FAILED;
        } else {
                if (qla2x00_marker(vha, vha->hw->base_qpair, 0, 0,
                                        MK_SYNC_ALL) != QLA_SUCCESS)
                        return QLA_FUNCTION_FAILED;
        }
        vha->marker_needed = 0;

        return QLA_SUCCESS;
}

static inline int
qla24xx_build_scsi_type_6_iocbs(srb_t *sp, struct cmd_type_6 *cmd_pkt,
        uint16_t tot_dsds)
{
        struct dsd64 *cur_dsd = NULL, *next_dsd;
        scsi_qla_host_t *vha;
        struct qla_hw_data *ha;
        struct scsi_cmnd *cmd;
        struct  scatterlist *cur_seg;
        uint8_t avail_dsds;
        uint8_t first_iocb = 1;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct ct6_dsd *ctx;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type 3 IOCB */
        put_unaligned_le32(COMMAND_TYPE_6, &cmd_pkt->entry_type);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return 0;
        }

        vha = sp->vha;
        ha = vha->hw;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->control_flags = cpu_to_le16(CF_WRITE_DATA);
                vha->qla_stats.output_bytes += scsi_bufflen(cmd);
                vha->qla_stats.output_requests++;
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->control_flags = cpu_to_le16(CF_READ_DATA);
                vha->qla_stats.input_bytes += scsi_bufflen(cmd);
                vha->qla_stats.input_requests++;
        }

        cur_seg = scsi_sglist(cmd);
        ctx = sp->u.scmd.ct6_ctx;

        while (tot_dsds) {
                avail_dsds = (tot_dsds > QLA_DSDS_PER_IOCB) ?
                    QLA_DSDS_PER_IOCB : tot_dsds;
                tot_dsds -= avail_dsds;
                dsd_list_len = (avail_dsds + 1) * QLA_DSD_SIZE;

                dsd_ptr = list_first_entry(&ha->gbl_dsd_list,
                    struct dsd_dma, list);
                next_dsd = dsd_ptr->dsd_addr;
                list_del(&dsd_ptr->list);
                ha->gbl_dsd_avail--;
                list_add_tail(&dsd_ptr->list, &ctx->dsd_list);
                ctx->dsd_use_cnt++;
                ha->gbl_dsd_inuse++;

                if (first_iocb) {
                        first_iocb = 0;
                        put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                           &cmd_pkt->fcp_dsd.address);
                        cmd_pkt->fcp_dsd.length = cpu_to_le32(dsd_list_len);
                } else {
                        put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                           &cur_dsd->address);
                        cur_dsd->length = cpu_to_le32(dsd_list_len);
                        cur_dsd++;
                }
                cur_dsd = next_dsd;
                while (avail_dsds) {
                        append_dsd64(&cur_dsd, cur_seg);
                        cur_seg = sg_next(cur_seg);
                        avail_dsds--;
                }
        }

        /* Null termination */
        cur_dsd->address = 0;
        cur_dsd->length = 0;
        cur_dsd++;
        cmd_pkt->control_flags |= CF_DATA_SEG_DESCR_ENABLE;
        return 0;
}

/*
 * qla24xx_calc_dsd_lists() - Determine number of DSD list required
 * for Command Type 6.
 *
 * @dsds: number of data segment decriptors needed
 *
 * Returns the number of dsd list needed to store @dsds.
 */
static inline uint16_t
qla24xx_calc_dsd_lists(uint16_t dsds)
{
        uint16_t dsd_lists = 0;

        dsd_lists = (dsds/QLA_DSDS_PER_IOCB);
        if (dsds % QLA_DSDS_PER_IOCB)
                dsd_lists++;
        return dsd_lists;
}


/**
 * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 * IOCB types.
 *
 * @sp: SRB command to process
 * @cmd_pkt: Command type 3 IOCB
 * @tot_dsds: Total number of segments to transfer
 * @req: pointer to request queue
 */
inline void
qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
        uint16_t tot_dsds, struct req_que *req)
{
        uint16_t        avail_dsds;
        struct dsd64    *cur_dsd;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        struct scatterlist *sg;
        int i;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type 3 IOCB */
        put_unaligned_le32(COMMAND_TYPE_7, &cmd_pkt->entry_type);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return;
        }

        vha = sp->vha;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->task_mgmt_flags = cpu_to_le16(TMF_WRITE_DATA);
                vha->qla_stats.output_bytes += scsi_bufflen(cmd);
                vha->qla_stats.output_requests++;
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->task_mgmt_flags = cpu_to_le16(TMF_READ_DATA);
                vha->qla_stats.input_bytes += scsi_bufflen(cmd);
                vha->qla_stats.input_requests++;
        }

        /* One DSD is available in the Command Type 3 IOCB */
        avail_dsds = 1;
        cur_dsd = &cmd_pkt->dsd;

        /* Load data segments */

        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                cont_a64_entry_t *cont_pkt;

                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        /*
                         * Five DSDs are available in the Continuation
                         * Type 1 IOCB.
                         */
                        cont_pkt = qla2x00_prep_cont_type1_iocb(vha, req);
                        cur_dsd = cont_pkt->dsd;
                        avail_dsds = ARRAY_SIZE(cont_pkt->dsd);
                }

                append_dsd64(&cur_dsd, sg);
                avail_dsds--;
        }
}

struct fw_dif_context {
        uint32_t ref_tag;
        uint16_t app_tag;
        uint8_t ref_tag_mask[4];        /* Validation/Replacement Mask*/
        uint8_t app_tag_mask[2];        /* Validation/Replacement Mask*/
};

/*
 * qla24xx_set_t10dif_tags_from_cmd - Extract Ref and App tags from SCSI command
 *
 */
static inline void
qla24xx_set_t10dif_tags(srb_t *sp, struct fw_dif_context *pkt,
    unsigned int protcnt)
{
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);

        switch (scsi_get_prot_type(cmd)) {
        case SCSI_PROT_DIF_TYPE0:
                /*
                 * No check for ql2xenablehba_err_chk, as it would be an
                 * I/O error if hba tag generation is not done.
                 */
                pkt->ref_tag = cpu_to_le32((uint32_t)
                    (0xffffffff & scsi_get_lba(cmd)));

                if (!qla2x00_hba_err_chk_enabled(sp))
                        break;

                pkt->ref_tag_mask[0] = 0xff;
                pkt->ref_tag_mask[1] = 0xff;
                pkt->ref_tag_mask[2] = 0xff;
                pkt->ref_tag_mask[3] = 0xff;
                break;

        /*
         * For TYPE 2 protection: 16 bit GUARD + 32 bit REF tag has to
         * match LBA in CDB + N
         */
        case SCSI_PROT_DIF_TYPE2:
                pkt->app_tag = cpu_to_le16(0);
                pkt->app_tag_mask[0] = 0x0;
                pkt->app_tag_mask[1] = 0x0;

                pkt->ref_tag = cpu_to_le32((uint32_t)
                    (0xffffffff & scsi_get_lba(cmd)));

                if (!qla2x00_hba_err_chk_enabled(sp))
                        break;

                /* enable ALL bytes of the ref tag */
                pkt->ref_tag_mask[0] = 0xff;
                pkt->ref_tag_mask[1] = 0xff;
                pkt->ref_tag_mask[2] = 0xff;
                pkt->ref_tag_mask[3] = 0xff;
                break;

        /* For Type 3 protection: 16 bit GUARD only */
        case SCSI_PROT_DIF_TYPE3:
                pkt->ref_tag_mask[0] = pkt->ref_tag_mask[1] =
                        pkt->ref_tag_mask[2] = pkt->ref_tag_mask[3] =
                                                                0x00;
                break;

        /*
         * For TYpe 1 protection: 16 bit GUARD tag, 32 bit REF tag, and
         * 16 bit app tag.
         */
        case SCSI_PROT_DIF_TYPE1:
                pkt->ref_tag = cpu_to_le32((uint32_t)
                    (0xffffffff & scsi_get_lba(cmd)));
                pkt->app_tag = cpu_to_le16(0);
                pkt->app_tag_mask[0] = 0x0;
                pkt->app_tag_mask[1] = 0x0;

                if (!qla2x00_hba_err_chk_enabled(sp))
                        break;

                /* enable ALL bytes of the ref tag */
                pkt->ref_tag_mask[0] = 0xff;
                pkt->ref_tag_mask[1] = 0xff;
                pkt->ref_tag_mask[2] = 0xff;
                pkt->ref_tag_mask[3] = 0xff;
                break;
        }
}

int
qla24xx_get_one_block_sg(uint32_t blk_sz, struct qla2_sgx *sgx,
        uint32_t *partial)
{
        struct scatterlist *sg;
        uint32_t cumulative_partial, sg_len;
        dma_addr_t sg_dma_addr;

        if (sgx->num_bytes == sgx->tot_bytes)
                return 0;

        sg = sgx->cur_sg;
        cumulative_partial = sgx->tot_partial;

        sg_dma_addr = sg_dma_address(sg);
        sg_len = sg_dma_len(sg);

        sgx->dma_addr = sg_dma_addr + sgx->bytes_consumed;

        if ((cumulative_partial + (sg_len - sgx->bytes_consumed)) >= blk_sz) {
                sgx->dma_len = (blk_sz - cumulative_partial);
                sgx->tot_partial = 0;
                sgx->num_bytes += blk_sz;
                *partial = 0;
        } else {
                sgx->dma_len = sg_len - sgx->bytes_consumed;
                sgx->tot_partial += sgx->dma_len;
                *partial = 1;
        }

        sgx->bytes_consumed += sgx->dma_len;

        if (sg_len == sgx->bytes_consumed) {
                sg = sg_next(sg);
                sgx->num_sg++;
                sgx->cur_sg = sg;
                sgx->bytes_consumed = 0;
        }

        return 1;
}

int
qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
        struct dsd64 *dsd, uint16_t tot_dsds, struct qla_tc_param *tc)
{
        void *next_dsd;
        uint8_t avail_dsds = 0;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct scatterlist *sg_prot;
        struct dsd64 *cur_dsd = dsd;
        uint16_t        used_dsds = tot_dsds;
        uint32_t        prot_int; /* protection interval */
        uint32_t        partial;
        struct qla2_sgx sgx;
        dma_addr_t      sle_dma;
        uint32_t        sle_dma_len, tot_prot_dma_len = 0;
        struct scsi_cmnd *cmd;

        memset(&sgx, 0, sizeof(struct qla2_sgx));
        if (sp) {
                cmd = GET_CMD_SP(sp);
                prot_int = cmd->device->sector_size;

                sgx.tot_bytes = scsi_bufflen(cmd);
                sgx.cur_sg = scsi_sglist(cmd);
                sgx.sp = sp;

                sg_prot = scsi_prot_sglist(cmd);
        } else if (tc) {
                prot_int      = tc->blk_sz;
                sgx.tot_bytes = tc->bufflen;
                sgx.cur_sg    = tc->sg;
                sg_prot       = tc->prot_sg;
        } else {
                BUG();
                return 1;
        }

        while (qla24xx_get_one_block_sg(prot_int, &sgx, &partial)) {

                sle_dma = sgx.dma_addr;
                sle_dma_len = sgx.dma_len;
alloc_and_fill:
                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
                                        QLA_DSDS_PER_IOCB : used_dsds;
                        dsd_list_len = (avail_dsds + 1) * 12;
                        used_dsds -= avail_dsds;

                        /* allocate tracking DS */
                        dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
                        if (!dsd_ptr)
                                return 1;

                        /* allocate new list */
                        dsd_ptr->dsd_addr = next_dsd =
                            dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
                                &dsd_ptr->dsd_list_dma);

                        if (!next_dsd) {
                                /*
                                 * Need to cleanup only this dsd_ptr, rest
                                 * will be done by sp_free_dma()
                                 */
                                kfree(dsd_ptr);
                                return 1;
                        }

                        if (sp) {
                                list_add_tail(&dsd_ptr->list,
                                              &sp->u.scmd.crc_ctx->dsd_list);

                                sp->flags |= SRB_CRC_CTX_DSD_VALID;
                        } else {
                                list_add_tail(&dsd_ptr->list,
                                    &(tc->ctx->dsd_list));
                                *tc->ctx_dsd_alloced = 1;
                        }


                        /* add new list to cmd iocb or last list */
                        put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                           &cur_dsd->address);
                        cur_dsd->length = cpu_to_le32(dsd_list_len);
                        cur_dsd = next_dsd;
                }
                put_unaligned_le64(sle_dma, &cur_dsd->address);
                cur_dsd->length = cpu_to_le32(sle_dma_len);
                cur_dsd++;
                avail_dsds--;

                if (partial == 0) {
                        /* Got a full protection interval */
                        sle_dma = sg_dma_address(sg_prot) + tot_prot_dma_len;
                        sle_dma_len = 8;

                        tot_prot_dma_len += sle_dma_len;
                        if (tot_prot_dma_len == sg_dma_len(sg_prot)) {
                                tot_prot_dma_len = 0;
                                sg_prot = sg_next(sg_prot);
                        }

                        partial = 1; /* So as to not re-enter this block */
                        goto alloc_and_fill;
                }
        }
        /* Null termination */
        cur_dsd->address = 0;
        cur_dsd->length = 0;
        cur_dsd++;
        return 0;
}

int

qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp,
        struct dsd64 *dsd, uint16_t tot_dsds, struct qla_tc_param *tc)
{
        void *next_dsd;
        uint8_t avail_dsds = 0;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct scatterlist *sg, *sgl;
        struct dsd64 *cur_dsd = dsd;
        int     i;
        uint16_t        used_dsds = tot_dsds;
        struct scsi_cmnd *cmd;

        if (sp) {
                cmd = GET_CMD_SP(sp);
                sgl = scsi_sglist(cmd);
        } else if (tc) {
                sgl = tc->sg;
        } else {
                BUG();
                return 1;
        }


        for_each_sg(sgl, sg, tot_dsds, i) {
                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
                                        QLA_DSDS_PER_IOCB : used_dsds;
                        dsd_list_len = (avail_dsds + 1) * 12;
                        used_dsds -= avail_dsds;

                        /* allocate tracking DS */
                        dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
                        if (!dsd_ptr)
                                return 1;

                        /* allocate new list */
                        dsd_ptr->dsd_addr = next_dsd =
                            dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
                                &dsd_ptr->dsd_list_dma);

                        if (!next_dsd) {
                                /*
                                 * Need to cleanup only this dsd_ptr, rest
                                 * will be done by sp_free_dma()
                                 */
                                kfree(dsd_ptr);
                                return 1;
                        }

                        if (sp) {
                                list_add_tail(&dsd_ptr->list,
                                              &sp->u.scmd.crc_ctx->dsd_list);

                                sp->flags |= SRB_CRC_CTX_DSD_VALID;
                        } else {
                                list_add_tail(&dsd_ptr->list,
                                    &(tc->ctx->dsd_list));
                                *tc->ctx_dsd_alloced = 1;
                        }

                        /* add new list to cmd iocb or last list */
                        put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                           &cur_dsd->address);
                        cur_dsd->length = cpu_to_le32(dsd_list_len);
                        cur_dsd = next_dsd;
                }
                append_dsd64(&cur_dsd, sg);
                avail_dsds--;

        }
        /* Null termination */
        cur_dsd->address = 0;
        cur_dsd->length = 0;
        cur_dsd++;
        return 0;
}

int
qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *ha, srb_t *sp,
        struct dsd64 *cur_dsd, uint16_t tot_dsds, struct qla_tgt_cmd *tc)
{
        struct dsd_dma *dsd_ptr = NULL, *dif_dsd, *nxt_dsd;
        struct scatterlist *sg, *sgl;
        struct crc_context *difctx = NULL;
        struct scsi_qla_host *vha;
        uint dsd_list_len;
        uint avail_dsds = 0;
        uint used_dsds = tot_dsds;
        bool dif_local_dma_alloc = false;
        bool direction_to_device = false;
        int i;

        if (sp) {
                struct scsi_cmnd *cmd = GET_CMD_SP(sp);

                sgl = scsi_prot_sglist(cmd);
                vha = sp->vha;
                difctx = sp->u.scmd.crc_ctx;
                direction_to_device = cmd->sc_data_direction == DMA_TO_DEVICE;
                ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe021,
                  "%s: scsi_cmnd: %p, crc_ctx: %p, sp: %p\n",
                        __func__, cmd, difctx, sp);
        } else if (tc) {
                vha = tc->vha;
                sgl = tc->prot_sg;
                difctx = tc->ctx;
                direction_to_device = tc->dma_data_direction == DMA_TO_DEVICE;
        } else {
                BUG();
                return 1;
        }

        ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe021,
            "%s: enter (write=%u)\n", __func__, direction_to_device);

        /* if initiator doing write or target doing read */
        if (direction_to_device) {
                for_each_sg(sgl, sg, tot_dsds, i) {
                        u64 sle_phys = sg_phys(sg);

                        /* If SGE addr + len flips bits in upper 32-bits */
                        if (MSD(sle_phys + sg->length) ^ MSD(sle_phys)) {
                                ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe022,
                                    "%s: page boundary crossing (phys=%llx len=%x)\n",
                                    __func__, sle_phys, sg->length);

                                if (difctx) {
                                        ha->dif_bundle_crossed_pages++;
                                        dif_local_dma_alloc = true;
                                } else {
                                        ql_dbg(ql_dbg_tgt + ql_dbg_verbose,
                                            vha, 0xe022,
                                            "%s: difctx pointer is NULL\n",
                                            __func__);
                                }
                                break;
                        }
                }
                ha->dif_bundle_writes++;
        } else {
                ha->dif_bundle_reads++;
        }

        if (ql2xdifbundlinginternalbuffers)
                dif_local_dma_alloc = direction_to_device;

        if (dif_local_dma_alloc) {
                u32 track_difbundl_buf = 0;
                u32 ldma_sg_len = 0;
                u8 ldma_needed = 1;

                difctx->no_dif_bundl = 0;
                difctx->dif_bundl_len = 0;

                /* Track DSD buffers */
                INIT_LIST_HEAD(&difctx->ldif_dsd_list);
                /* Track local DMA buffers */
                INIT_LIST_HEAD(&difctx->ldif_dma_hndl_list);

                for_each_sg(sgl, sg, tot_dsds, i) {
                        u32 sglen = sg_dma_len(sg);

                        ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe023,
                            "%s: sg[%x] (phys=%llx sglen=%x) ldma_sg_len: %x dif_bundl_len: %x ldma_needed: %x\n",
                            __func__, i, (u64)sg_phys(sg), sglen, ldma_sg_len,
                            difctx->dif_bundl_len, ldma_needed);

                        while (sglen) {
                                u32 xfrlen = 0;

                                if (ldma_needed) {
                                        /*
                                         * Allocate list item to store
                                         * the DMA buffers
                                         */
                                        dsd_ptr = kzalloc(sizeof(*dsd_ptr),
                                            GFP_ATOMIC);
                                        if (!dsd_ptr) {
                                                ql_dbg(ql_dbg_tgt, vha, 0xe024,
                                                    "%s: failed alloc dsd_ptr\n",
                                                    __func__);
                                                return 1;
                                        }
                                        ha->dif_bundle_kallocs++;

                                        /* allocate dma buffer */
                                        dsd_ptr->dsd_addr = dma_pool_alloc
                                                (ha->dif_bundl_pool, GFP_ATOMIC,
                                                 &dsd_ptr->dsd_list_dma);
                                        if (!dsd_ptr->dsd_addr) {
                                                ql_dbg(ql_dbg_tgt, vha, 0xe024,
                                                    "%s: failed alloc ->dsd_ptr\n",
                                                    __func__);
                                                /*
                                                 * need to cleanup only this
                                                 * dsd_ptr rest will be done
                                                 * by sp_free_dma()
                                                 */
                                                kfree(dsd_ptr);
                                                ha->dif_bundle_kallocs--;
                                                return 1;
                                        }
                                        ha->dif_bundle_dma_allocs++;
                                        ldma_needed = 0;
                                        difctx->no_dif_bundl++;
                                        list_add_tail(&dsd_ptr->list,
                                            &difctx->ldif_dma_hndl_list);
                                }

                                /* xfrlen is min of dma pool size and sglen */
                                xfrlen = (sglen >
                                   (DIF_BUNDLING_DMA_POOL_SIZE - ldma_sg_len)) ?
                                    DIF_BUNDLING_DMA_POOL_SIZE - ldma_sg_len :
                                    sglen;

                                /* replace with local allocated dma buffer */
                                sg_pcopy_to_buffer(sgl, sg_nents(sgl),
                                    dsd_ptr->dsd_addr + ldma_sg_len, xfrlen,
                                    difctx->dif_bundl_len);
                                difctx->dif_bundl_len += xfrlen;
                                sglen -= xfrlen;
                                ldma_sg_len += xfrlen;
                                if (ldma_sg_len == DIF_BUNDLING_DMA_POOL_SIZE ||
                                    sg_is_last(sg)) {
                                        ldma_needed = 1;
                                        ldma_sg_len = 0;
                                }
                        }
                }

                track_difbundl_buf = used_dsds = difctx->no_dif_bundl;
                ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe025,
                    "dif_bundl_len=%x, no_dif_bundl=%x track_difbundl_buf: %x\n",
                    difctx->dif_bundl_len, difctx->no_dif_bundl,
                    track_difbundl_buf);

                if (sp)
                        sp->flags |= SRB_DIF_BUNDL_DMA_VALID;
                else
                        tc->prot_flags = DIF_BUNDL_DMA_VALID;

                list_for_each_entry_safe(dif_dsd, nxt_dsd,
                    &difctx->ldif_dma_hndl_list, list) {
                        u32 sglen = (difctx->dif_bundl_len >
                            DIF_BUNDLING_DMA_POOL_SIZE) ?
                            DIF_BUNDLING_DMA_POOL_SIZE : difctx->dif_bundl_len;

                        BUG_ON(track_difbundl_buf == 0);

                        /* Allocate additional continuation packets? */
                        if (avail_dsds == 0) {
                                ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha,
                                    0xe024,
                                    "%s: adding continuation iocb's\n",
                                    __func__);
                                avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
                                    QLA_DSDS_PER_IOCB : used_dsds;
                                dsd_list_len = (avail_dsds + 1) * 12;
                                used_dsds -= avail_dsds;

                                /* allocate tracking DS */
                                dsd_ptr = kzalloc(sizeof(*dsd_ptr), GFP_ATOMIC);
                                if (!dsd_ptr) {
                                        ql_dbg(ql_dbg_tgt, vha, 0xe026,
                                            "%s: failed alloc dsd_ptr\n",
                                            __func__);
                                        return 1;
                                }
                                ha->dif_bundle_kallocs++;

                                difctx->no_ldif_dsd++;
                                /* allocate new list */
                                dsd_ptr->dsd_addr =
                                    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
                                        &dsd_ptr->dsd_list_dma);
                                if (!dsd_ptr->dsd_addr) {
                                        ql_dbg(ql_dbg_tgt, vha, 0xe026,
                                            "%s: failed alloc ->dsd_addr\n",
                                            __func__);
                                        /*
                                         * need to cleanup only this dsd_ptr
                                         *  rest will be done by sp_free_dma()
                                         */
                                        kfree(dsd_ptr);
                                        ha->dif_bundle_kallocs--;
                                        return 1;
                                }
                                ha->dif_bundle_dma_allocs++;

                                if (sp) {
                                        list_add_tail(&dsd_ptr->list,
                                            &difctx->ldif_dsd_list);
                                        sp->flags |= SRB_CRC_CTX_DSD_VALID;
                                } else {
                                        list_add_tail(&dsd_ptr->list,
                                            &difctx->ldif_dsd_list);
                                        tc->ctx_dsd_alloced = 1;
                                }

                                /* add new list to cmd iocb or last list */
                                put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                                   &cur_dsd->address);
                                cur_dsd->length = cpu_to_le32(dsd_list_len);
                                cur_dsd = dsd_ptr->dsd_addr;
                        }
                        put_unaligned_le64(dif_dsd->dsd_list_dma,
                                           &cur_dsd->address);
                        cur_dsd->length = cpu_to_le32(sglen);
                        cur_dsd++;
                        avail_dsds--;
                        difctx->dif_bundl_len -= sglen;
                        track_difbundl_buf--;
                }

                ql_dbg(ql_dbg_tgt + ql_dbg_verbose, vha, 0xe026,
                    "%s: no_ldif_dsd:%x, no_dif_bundl:%x\n", __func__,
                        difctx->no_ldif_dsd, difctx->no_dif_bundl);
        } else {
                for_each_sg(sgl, sg, tot_dsds, i) {
                        /* Allocate additional continuation packets? */
                        if (avail_dsds == 0) {
                                avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
                                    QLA_DSDS_PER_IOCB : used_dsds;
                                dsd_list_len = (avail_dsds + 1) * 12;
                                used_dsds -= avail_dsds;

                                /* allocate tracking DS */
                                dsd_ptr = kzalloc(sizeof(*dsd_ptr), GFP_ATOMIC);
                                if (!dsd_ptr) {
                                        ql_dbg(ql_dbg_tgt + ql_dbg_verbose,
                                            vha, 0xe027,
                                            "%s: failed alloc dsd_dma...\n",
                                            __func__);
                                        return 1;
                                }

                                /* allocate new list */
                                dsd_ptr->dsd_addr =
                                    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
                                        &dsd_ptr->dsd_list_dma);
                                if (!dsd_ptr->dsd_addr) {
                                        /* need to cleanup only this dsd_ptr */
                                        /* rest will be done by sp_free_dma() */
                                        kfree(dsd_ptr);
                                        return 1;
                                }

                                if (sp) {
                                        list_add_tail(&dsd_ptr->list,
                                            &difctx->dsd_list);
                                        sp->flags |= SRB_CRC_CTX_DSD_VALID;
                                } else {
                                        list_add_tail(&dsd_ptr->list,
                                            &difctx->dsd_list);
                                        tc->ctx_dsd_alloced = 1;
                                }

                                /* add new list to cmd iocb or last list */
                                put_unaligned_le64(dsd_ptr->dsd_list_dma,
                                                   &cur_dsd->address);
                                cur_dsd->length = cpu_to_le32(dsd_list_len);
                                cur_dsd = dsd_ptr->dsd_addr;
                        }
                        append_dsd64(&cur_dsd, sg);
                        avail_dsds--;
                }
        }
        /* Null termination */
        cur_dsd->address = 0;
        cur_dsd->length = 0;
        cur_dsd++;
        return 0;
}

/**
 * qla24xx_build_scsi_crc_2_iocbs() - Build IOCB command utilizing Command
 *                                                      Type 6 IOCB types.
 *
 * @sp: SRB command to process
 * @cmd_pkt: Command type 3 IOCB
 * @tot_dsds: Total number of segments to transfer
 * @tot_prot_dsds: Total number of segments with protection information
 * @fw_prot_opts: Protection options to be passed to firmware
 */
static inline int
qla24xx_build_scsi_crc_2_iocbs(srb_t *sp, struct cmd_type_crc_2 *cmd_pkt,
    uint16_t tot_dsds, uint16_t tot_prot_dsds, uint16_t fw_prot_opts)
{
        struct dsd64            *cur_dsd;
        uint32_t                *fcp_dl;
        scsi_qla_host_t         *vha;
        struct scsi_cmnd        *cmd;
        uint32_t                total_bytes = 0;
        uint32_t                data_bytes;
        uint32_t                dif_bytes;
        uint8_t                 bundling = 1;
        uint16_t                blk_size;
        struct crc_context      *crc_ctx_pkt = NULL;
        struct qla_hw_data      *ha;
        uint8_t                 additional_fcpcdb_len;
        uint16_t                fcp_cmnd_len;
        struct fcp_cmnd         *fcp_cmnd;
        dma_addr_t              crc_ctx_dma;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type CRC_2 IOCB */
        put_unaligned_le32(COMMAND_TYPE_CRC_2, &cmd_pkt->entry_type);

        vha = sp->vha;
        ha = vha->hw;

        /* No data transfer */
        data_bytes = scsi_bufflen(cmd);
        if (!data_bytes || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return QLA_SUCCESS;
        }

        cmd_pkt->vp_index = sp->vha->vp_idx;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->control_flags =
                    cpu_to_le16(CF_WRITE_DATA);
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->control_flags =
                    cpu_to_le16(CF_READ_DATA);
        }

        if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
            (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP) ||
            (scsi_get_prot_op(cmd) == SCSI_PROT_READ_STRIP) ||
            (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_INSERT))
                bundling = 0;

        /* Allocate CRC context from global pool */
        crc_ctx_pkt = sp->u.scmd.crc_ctx =
            dma_pool_zalloc(ha->dl_dma_pool, GFP_ATOMIC, &crc_ctx_dma);

        if (!crc_ctx_pkt)
                goto crc_queuing_error;

        crc_ctx_pkt->crc_ctx_dma = crc_ctx_dma;

        sp->flags |= SRB_CRC_CTX_DMA_VALID;

        /* Set handle */
        crc_ctx_pkt->handle = cmd_pkt->handle;

        INIT_LIST_HEAD(&crc_ctx_pkt->dsd_list);

        qla24xx_set_t10dif_tags(sp, (struct fw_dif_context *)
            &crc_ctx_pkt->ref_tag, tot_prot_dsds);

        put_unaligned_le64(crc_ctx_dma, &cmd_pkt->crc_context_address);
        cmd_pkt->crc_context_len = CRC_CONTEXT_LEN_FW;

        /* Determine SCSI command length -- align to 4 byte boundary */
        if (cmd->cmd_len > 16) {
                additional_fcpcdb_len = cmd->cmd_len - 16;
                if ((cmd->cmd_len % 4) != 0) {
                        /* SCSI cmd > 16 bytes must be multiple of 4 */
                        goto crc_queuing_error;
                }
                fcp_cmnd_len = 12 + cmd->cmd_len + 4;
        } else {
                additional_fcpcdb_len = 0;
                fcp_cmnd_len = 12 + 16 + 4;
        }

        fcp_cmnd = &crc_ctx_pkt->fcp_cmnd;

        fcp_cmnd->additional_cdb_len = additional_fcpcdb_len;
        if (cmd->sc_data_direction == DMA_TO_DEVICE)
                fcp_cmnd->additional_cdb_len |= 1;
        else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
                fcp_cmnd->additional_cdb_len |= 2;

        int_to_scsilun(cmd->device->lun, &fcp_cmnd->lun);
        memcpy(fcp_cmnd->cdb, cmd->cmnd, cmd->cmd_len);
        cmd_pkt->fcp_cmnd_dseg_len = cpu_to_le16(fcp_cmnd_len);
        put_unaligned_le64(crc_ctx_dma + CRC_CONTEXT_FCPCMND_OFF,
                           &cmd_pkt->fcp_cmnd_dseg_address);
        fcp_cmnd->task_management = 0;
        fcp_cmnd->task_attribute = TSK_SIMPLE;

        cmd_pkt->fcp_rsp_dseg_len = 0; /* Let response come in status iocb */

        /* Compute dif len and adjust data len to incude protection */
        dif_bytes = 0;
        blk_size = cmd->device->sector_size;
        dif_bytes = (data_bytes / blk_size) * 8;

        switch (scsi_get_prot_op(GET_CMD_SP(sp))) {
        case SCSI_PROT_READ_INSERT:
        case SCSI_PROT_WRITE_STRIP:
                total_bytes = data_bytes;
                data_bytes += dif_bytes;
                break;

        case SCSI_PROT_READ_STRIP:
        case SCSI_PROT_WRITE_INSERT:
        case SCSI_PROT_READ_PASS:
        case SCSI_PROT_WRITE_PASS:
                total_bytes = data_bytes + dif_bytes;
                break;
        default:
                BUG();
        }

        if (!qla2x00_hba_err_chk_enabled(sp))
                fw_prot_opts |= 0x10; /* Disable Guard tag checking */
        /* HBA error checking enabled */
        else if (IS_PI_UNINIT_CAPABLE(ha)) {
                if ((scsi_get_prot_type(GET_CMD_SP(sp)) == SCSI_PROT_DIF_TYPE1)
                    || (scsi_get_prot_type(GET_CMD_SP(sp)) ==
                        SCSI_PROT_DIF_TYPE2))
                        fw_prot_opts |= BIT_10;
                else if (scsi_get_prot_type(GET_CMD_SP(sp)) ==
                    SCSI_PROT_DIF_TYPE3)
                        fw_prot_opts |= BIT_11;
        }

        if (!bundling) {
                cur_dsd = &crc_ctx_pkt->u.nobundling.data_dsd[0];
        } else {
                /*
                 * Configure Bundling if we need to fetch interlaving
                 * protection PCI accesses
                 */
                fw_prot_opts |= PO_ENABLE_DIF_BUNDLING;
                crc_ctx_pkt->u.bundling.dif_byte_count = cpu_to_le32(dif_bytes);
                crc_ctx_pkt->u.bundling.dseg_count = cpu_to_le16(tot_dsds -
                                                        tot_prot_dsds);
                cur_dsd = &crc_ctx_pkt->u.bundling.data_dsd[0];
        }

        /* Finish the common fields of CRC pkt */
        crc_ctx_pkt->blk_size = cpu_to_le16(blk_size);
        crc_ctx_pkt->prot_opts = cpu_to_le16(fw_prot_opts);
        crc_ctx_pkt->byte_count = cpu_to_le32(data_bytes);
        crc_ctx_pkt->guard_seed = cpu_to_le16(0);
        /* Fibre channel byte count */
        cmd_pkt->byte_count = cpu_to_le32(total_bytes);
        fcp_dl = (uint32_t *)(crc_ctx_pkt->fcp_cmnd.cdb + 16 +
            additional_fcpcdb_len);
        *fcp_dl = htonl(total_bytes);

        if (!data_bytes || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = cpu_to_le32(0);
                return QLA_SUCCESS;
        }
        /* Walks data segments */

        cmd_pkt->control_flags |= cpu_to_le16(CF_DATA_SEG_DESCR_ENABLE);

        if (!bundling && tot_prot_dsds) {
                if (qla24xx_walk_and_build_sglist_no_difb(ha, sp,
                        cur_dsd, tot_dsds, NULL))
                        goto crc_queuing_error;
        } else if (qla24xx_walk_and_build_sglist(ha, sp, cur_dsd,
                        (tot_dsds - tot_prot_dsds), NULL))
                goto crc_queuing_error;

        if (bundling && tot_prot_dsds) {
                /* Walks dif segments */
                cmd_pkt->control_flags |= cpu_to_le16(CF_DIF_SEG_DESCR_ENABLE);
                cur_dsd = &crc_ctx_pkt->u.bundling.dif_dsd;
                if (qla24xx_walk_and_build_prot_sglist(ha, sp, cur_dsd,
                                tot_prot_dsds, NULL))
                        goto crc_queuing_error;
        }
        return QLA_SUCCESS;

crc_queuing_error:
        /* Cleanup will be performed by the caller */

        return QLA_FUNCTION_FAILED;
}

/**
 * qla24xx_start_scsi() - Send a SCSI command to the ISP
 * @sp: command to send to the ISP
 *
 * Returns non-zero if a failure occurred, else zero.
 */
int
qla24xx_start_scsi(srb_t *sp)
{
        int             nseg;
        unsigned long   flags;
        uint32_t        *clr_ptr;
        uint32_t        handle;
        struct cmd_type_7 *cmd_pkt;
        uint16_t        cnt;
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct req_que *req = NULL;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host *vha = sp->vha;
        struct qla_hw_data *ha = vha->hw;

        /* Setup device pointers. */
        req = vha->req;

        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (qla2x00_marker(vha, ha->base_qpair, 0, 0, MK_SYNC_ALL) !=
                    QLA_SUCCESS)
                        return QLA_FUNCTION_FAILED;
                vha->marker_needed = 0;
        }

        /* Acquire ring specific lock */
        spin_lock_irqsave(&ha->hardware_lock, flags);

        handle = qla2xxx_get_next_handle(req);
        if (handle == 0)
                goto queuing_error;

        /* Map the sg table so we have an accurate count of sg entries needed */
        if (scsi_sg_count(cmd)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
                    scsi_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
        } else
                nseg = 0;

        tot_dsds = nseg;
        req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
        if (req->cnt < (req_cnt + 2)) {
                cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
                    RD_REG_DWORD_RELAXED(req->req_q_out);
                if (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                                (req->ring_index - cnt);
                if (req->cnt < (req_cnt + 2))
                        goto queuing_error;
        }

        /* Build command packet. */
        req->current_outstanding_cmd = handle;
        req->outstanding_cmds[handle] = sp;
        sp->handle = handle;
        cmd->host_scribble = (unsigned char *)(unsigned long)handle;
        req->cnt -= req_cnt;

        cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
        cmd_pkt->handle = MAKE_HANDLE(req->id, handle);

        /* Zero out remaining portion of packet. */
        /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
        clr_ptr = (uint32_t *)cmd_pkt + 2;
        memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
        cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);

        /* Set NPORT-ID and LUN number*/
        cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
        cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
        cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
        cmd_pkt->vp_index = sp->vha->vp_idx;

        int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
        host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));

        cmd_pkt->task = TSK_SIMPLE;

        /* Load SCSI command packet. */
        memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
        host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));

        cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));

        /* Build IOCB segments */
        qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds, req);

        /* Set total data segment count. */
        cmd_pkt->entry_count = (uint8_t)req_cnt;
        wmb();
        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else
                req->ring_ptr++;

        sp->flags |= SRB_DMA_VALID;

        /* Set chip new ring index. */
        WRT_REG_DWORD(req->req_q_in, req->ring_index);

        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return QLA_SUCCESS;

queuing_error:
        if (tot_dsds)
                scsi_dma_unmap(cmd);

        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return QLA_FUNCTION_FAILED;
}

/**
 * qla24xx_dif_start_scsi() - Send a SCSI command to the ISP
 * @sp: command to send to the ISP
 *
 * Returns non-zero if a failure occurred, else zero.
 */
int
qla24xx_dif_start_scsi(srb_t *sp)
{
        int                     nseg;
        unsigned long           flags;
        uint32_t                *clr_ptr;
        uint32_t                handle;
        uint16_t                cnt;
        uint16_t                req_cnt = 0;
        uint16_t                tot_dsds;
        uint16_t                tot_prot_dsds;
        uint16_t                fw_prot_opts = 0;
        struct req_que          *req = NULL;
        struct rsp_que          *rsp = NULL;
        struct scsi_cmnd        *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host    *vha = sp->vha;
        struct qla_hw_data      *ha = vha->hw;
        struct cmd_type_crc_2   *cmd_pkt;
        uint32_t                status = 0;

#define QDSS_GOT_Q_SPACE        BIT_0

        /* Only process protection or >16 cdb in this routine */
        if (scsi_get_prot_op(cmd) == SCSI_PROT_NORMAL) {
                if (cmd->cmd_len <= 16)
                        return qla24xx_start_scsi(sp);
        }

        /* Setup device pointers. */
        req = vha->req;
        rsp = req->rsp;

        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (qla2x00_marker(vha, ha->base_qpair, 0, 0, MK_SYNC_ALL) !=
                    QLA_SUCCESS)
                        return QLA_FUNCTION_FAILED;
                vha->marker_needed = 0;
        }

        /* Acquire ring specific lock */
        spin_lock_irqsave(&ha->hardware_lock, flags);

        handle = qla2xxx_get_next_handle(req);
        if (handle == 0)
                goto queuing_error;

        /* Compute number of required data segments */
        /* Map the sg table so we have an accurate count of sg entries needed */
        if (scsi_sg_count(cmd)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
                    scsi_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
                else
                        sp->flags |= SRB_DMA_VALID;

                if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
                    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
                        struct qla2_sgx sgx;
                        uint32_t        partial;

                        memset(&sgx, 0, sizeof(struct qla2_sgx));
                        sgx.tot_bytes = scsi_bufflen(cmd);
                        sgx.cur_sg = scsi_sglist(cmd);
                        sgx.sp = sp;

                        nseg = 0;
                        while (qla24xx_get_one_block_sg(
                            cmd->device->sector_size, &sgx, &partial))
                                nseg++;
                }
        } else
                nseg = 0;

        /* number of required data segments */
        tot_dsds = nseg;

        /* Compute number of required protection segments */
        if (qla24xx_configure_prot_mode(sp, &fw_prot_opts)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_prot_sglist(cmd),
                    scsi_prot_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
                else
                        sp->flags |= SRB_CRC_PROT_DMA_VALID;

                if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
                    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
                        nseg = scsi_bufflen(cmd) / cmd->device->sector_size;
                }
        } else {
                nseg = 0;
        }

        req_cnt = 1;
        /* Total Data and protection sg segment(s) */
        tot_prot_dsds = nseg;
        tot_dsds += nseg;
        if (req->cnt < (req_cnt + 2)) {
                cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
                    RD_REG_DWORD_RELAXED(req->req_q_out);
                if (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                                (req->ring_index - cnt);
                if (req->cnt < (req_cnt + 2))
                        goto queuing_error;
        }

        status |= QDSS_GOT_Q_SPACE;

        /* Build header part of command packet (excluding the OPCODE). */
        req->current_outstanding_cmd = handle;
        req->outstanding_cmds[handle] = sp;
        sp->handle = handle;
        cmd->host_scribble = (unsigned char *)(unsigned long)handle;
        req->cnt -= req_cnt;

        /* Fill-in common area */
        cmd_pkt = (struct cmd_type_crc_2 *)req->ring_ptr;
        cmd_pkt->handle = MAKE_HANDLE(req->id, handle);

        clr_ptr = (uint32_t *)cmd_pkt + 2;
        memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);

        /* Set NPORT-ID and LUN number*/
        cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
        cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
        cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;

        int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
        host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));

        /* Total Data and protection segment(s) */
        cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);

        /* Build IOCB segments and adjust for data protection segments */
        if (qla24xx_build_scsi_crc_2_iocbs(sp, (struct cmd_type_crc_2 *)
            req->ring_ptr, tot_dsds, tot_prot_dsds, fw_prot_opts) !=
                QLA_SUCCESS)
                goto queuing_error;

        cmd_pkt->entry_count = (uint8_t)req_cnt;
        /* Specify response queue number where completion should happen */
        cmd_pkt->entry_status = (uint8_t) rsp->id;
        cmd_pkt->timeout = cpu_to_le16(0);
        wmb();

        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else
                req->ring_ptr++;

        /* Set chip new ring index. */
        WRT_REG_DWORD(req->req_q_in, req->ring_index);

        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return QLA_SUCCESS;

queuing_error:
        if (status & QDSS_GOT_Q_SPACE) {
                req->outstanding_cmds[handle] = NULL;
                req->cnt += req_cnt;
        }
        /* Cleanup will be performed by the caller (queuecommand) */

        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return QLA_FUNCTION_FAILED;
}

/**
 * qla2xxx_start_scsi_mq() - Send a SCSI command to the ISP
 * @sp: command to send to the ISP
 *
 * Returns non-zero if a failure occurred, else zero.
 */
static int
qla2xxx_start_scsi_mq(srb_t *sp)
{
        int             nseg;
        unsigned long   flags;
        uint32_t        *clr_ptr;
        uint32_t        handle;
        struct cmd_type_7 *cmd_pkt;
        uint16_t        cnt;
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct req_que *req = NULL;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host *vha = sp->fcport->vha;
        struct qla_hw_data *ha = vha->hw;
        struct qla_qpair *qpair = sp->qpair;

        /* Acquire qpair specific lock */
        spin_lock_irqsave(&qpair->qp_lock, flags);

        /* Setup qpair pointers */
        req = qpair->req;

        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (__qla2x00_marker(vha, qpair, 0, 0, MK_SYNC_ALL) !=
                    QLA_SUCCESS) {
                        spin_unlock_irqrestore(&qpair->qp_lock, flags);
                        return QLA_FUNCTION_FAILED;
                }
                vha->marker_needed = 0;
        }

        handle = qla2xxx_get_next_handle(req);
        if (handle == 0)
                goto queuing_error;

        /* Map the sg table so we have an accurate count of sg entries needed */
        if (scsi_sg_count(cmd)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
                    scsi_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
        } else
                nseg = 0;

        tot_dsds = nseg;
        req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
        if (req->cnt < (req_cnt + 2)) {
                cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
                    RD_REG_DWORD_RELAXED(req->req_q_out);
                if (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                                (req->ring_index - cnt);
                if (req->cnt < (req_cnt + 2))
                        goto queuing_error;
        }

        /* Build command packet. */
        req->current_outstanding_cmd = handle;
        req->outstanding_cmds[handle] = sp;
        sp->handle = handle;
        cmd->host_scribble = (unsigned char *)(unsigned long)handle;
        req->cnt -= req_cnt;

        cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
        cmd_pkt->handle = MAKE_HANDLE(req->id, handle);

        /* Zero out remaining portion of packet. */
        /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
        clr_ptr = (uint32_t *)cmd_pkt + 2;
        memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
        cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);

        /* Set NPORT-ID and LUN number*/
        cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
        cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
        cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
        cmd_pkt->vp_index = sp->fcport->vha->vp_idx;

        int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
        host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));

        cmd_pkt->task = TSK_SIMPLE;

        /* Load SCSI command packet. */
        memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
        host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));

        cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));

        /* Build IOCB segments */
        qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds, req);

        /* Set total data segment count. */
        cmd_pkt->entry_count = (uint8_t)req_cnt;
        wmb();
        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else
                req->ring_ptr++;

        sp->flags |= SRB_DMA_VALID;

        /* Set chip new ring index. */
        WRT_REG_DWORD(req->req_q_in, req->ring_index);

        spin_unlock_irqrestore(&qpair->qp_lock, flags);
        return QLA_SUCCESS;

queuing_error:
        if (tot_dsds)
                scsi_dma_unmap(cmd);

        spin_unlock_irqrestore(&qpair->qp_lock, flags);

        return QLA_FUNCTION_FAILED;
}


/**
 * qla2xxx_dif_start_scsi_mq() - Send a SCSI command to the ISP
 * @sp: command to send to the ISP
 *
 * Returns non-zero if a failure occurred, else zero.
 */
int
qla2xxx_dif_start_scsi_mq(srb_t *sp)
{
        int                     nseg;
        unsigned long           flags;
        uint32_t                *clr_ptr;
        uint32_t                handle;
        uint16_t                cnt;
        uint16_t                req_cnt = 0;
        uint16_t                tot_dsds;
        uint16_t                tot_prot_dsds;
        uint16_t                fw_prot_opts = 0;
        struct req_que          *req = NULL;
        struct rsp_que          *rsp = NULL;
        struct scsi_cmnd        *cmd = GET_CMD_SP(sp);
        struct scsi_qla_host    *vha = sp->fcport->vha;
        struct qla_hw_data      *ha = vha->hw;
        struct cmd_type_crc_2   *cmd_pkt;
        uint32_t                status = 0;
        struct qla_qpair        *qpair = sp->qpair;

#define QDSS_GOT_Q_SPACE        BIT_0

        /* Check for host side state */
        if (!qpair->online) {
                cmd->result = DID_NO_CONNECT << 16;
                return QLA_INTERFACE_ERROR;
        }

        if (!qpair->difdix_supported &&
                scsi_get_prot_op(cmd) != SCSI_PROT_NORMAL) {
                cmd->result = DID_NO_CONNECT << 16;
                return QLA_INTERFACE_ERROR;
        }

        /* Only process protection or >16 cdb in this routine */
        if (scsi_get_prot_op(cmd) == SCSI_PROT_NORMAL) {
                if (cmd->cmd_len <= 16)
                        return qla2xxx_start_scsi_mq(sp);
        }

        spin_lock_irqsave(&qpair->qp_lock, flags);

        /* Setup qpair pointers */
        rsp = qpair->rsp;
        req = qpair->req;

        /* So we know we haven't pci_map'ed anything yet */
        tot_dsds = 0;

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (__qla2x00_marker(vha, qpair, 0, 0, MK_SYNC_ALL) !=
                    QLA_SUCCESS) {
                        spin_unlock_irqrestore(&qpair->qp_lock, flags);
                        return QLA_FUNCTION_FAILED;
                }
                vha->marker_needed = 0;
        }

        handle = qla2xxx_get_next_handle(req);
        if (handle == 0)
                goto queuing_error;

        /* Compute number of required data segments */
        /* Map the sg table so we have an accurate count of sg entries needed */
        if (scsi_sg_count(cmd)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
                    scsi_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
                else
                        sp->flags |= SRB_DMA_VALID;

                if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
                    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
                        struct qla2_sgx sgx;
                        uint32_t        partial;

                        memset(&sgx, 0, sizeof(struct qla2_sgx));
                        sgx.tot_bytes = scsi_bufflen(cmd);
                        sgx.cur_sg = scsi_sglist(cmd);
                        sgx.sp = sp;

                        nseg = 0;
                        while (qla24xx_get_one_block_sg(
                            cmd->device->sector_size, &sgx, &partial))
                                nseg++;
                }
        } else
                nseg = 0;

        /* number of required data segments */
        tot_dsds = nseg;

        /* Compute number of required protection segments */
        if (qla24xx_configure_prot_mode(sp, &fw_prot_opts)) {
                nseg = dma_map_sg(&ha->pdev->dev, scsi_prot_sglist(cmd),
                    scsi_prot_sg_count(cmd), cmd->sc_data_direction);
                if (unlikely(!nseg))
                        goto queuing_error;
                else
                        sp->flags |= SRB_CRC_PROT_DMA_VALID;

                if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
                    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
                        nseg = scsi_bufflen(cmd) / cmd->device->sector_size;
                }
        } else {
                nseg = 0;
        }

        req_cnt = 1;
        /* Total Data and protection sg segment(s) */
        tot_prot_dsds = nseg;
        tot_dsds += nseg;
        if (req->cnt < (req_cnt + 2)) {
                cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
                    RD_REG_DWORD_RELAXED(req->req_q_out);
                if (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                                (req->ring_index - cnt);
                if (req->cnt < (req_cnt + 2))
                        goto queuing_error;
        }

        status |= QDSS_GOT_Q_SPACE;

        /* Build header part of command packet (excluding the OPCODE). */
        req->current_outstanding_cmd = handle;
        req->outstanding_cmds[handle] = sp;
        sp->handle = handle;
        cmd->host_scribble = (unsigned char *)(unsigned long)handle;
        req->cnt -= req_cnt;

        /* Fill-in common area */
        cmd_pkt = (struct cmd_type_crc_2 *)req->ring_ptr;
        cmd_pkt->handle = MAKE_HANDLE(req->id, handle);

        clr_ptr = (uint32_t *)cmd_pkt + 2;
        memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);

        /* Set NPORT-ID and LUN number*/
        cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
        cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
        cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;

        int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
        host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));

        /* Total Data and protection segment(s) */
        cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);

        /* Build IOCB segments and adjust for data protection segments */
        if (qla24xx_build_scsi_crc_2_iocbs(sp, (struct cmd_type_crc_2 *)
            req->ring_ptr, tot_dsds, tot_prot_dsds, fw_prot_opts) !=
                QLA_SUCCESS)
                goto queuing_error;

        cmd_pkt->entry_count = (uint8_t)req_cnt;
        cmd_pkt->timeout = cpu_to_le16(0);
        wmb();

        /* Adjust ring index. */
        req->ring_index++;
        if (req->ring_index == req->length) {
                req->ring_index = 0;
                req->ring_ptr = req->ring;
        } else
                req->ring_ptr++;

        /* Set chip new ring index. */
        WRT_REG_DWORD(req->req_q_in, req->ring_index);

        /* Manage unprocessed RIO/ZIO commands in response queue. */
        if (vha->flags.process_response_queue &&
            rsp->ring_ptr->signature != RESPONSE_PROCESSED)
                qla24xx_process_response_queue(vha, rsp);

        spin_unlock_irqrestore(&qpair->qp_lock, flags);

        return QLA_SUCCESS;

queuing_error:
        if (status & QDSS_GOT_Q_SPACE) {
                req->outstanding_cmds[handle] = NULL;
                req->cnt += req_cnt;
        }
        /* Cleanup will be performed by the caller (queuecommand) */

        spin_unlock_irqrestore(&qpair->qp_lock, flags);
        return QLA_FUNCTION_FAILED;
}

/* Generic Control-SRB manipulation functions. */

/* hardware_lock assumed to be held. */

void *
__qla2x00_alloc_iocbs(struct qla_qpair *qpair, srb_t *sp)
{
        scsi_qla_host_t *vha = qpair->vha;
        struct qla_hw_data *ha = vha->hw;
        struct req_que *req = qpair->req;
        device_reg_t *reg = ISP_QUE_REG(ha, req->id);
        uint32_t handle;
        request_t *pkt;
        uint16_t cnt, req_cnt;

        pkt = NULL;
        req_cnt = 1;
        handle = 0;

        if (sp && (sp->type != SRB_SCSI_CMD)) {
                /* Adjust entry-counts as needed. */
                req_cnt = sp->iocbs;
        }

        /* Check for room on request queue. */
        if (req->cnt < req_cnt + 2) {
                if (qpair->use_shadow_reg)
                        cnt = *req->out_ptr;
                else if (ha->mqenable || IS_QLA83XX(ha) || IS_QLA27XX(ha) ||
                    IS_QLA28XX(ha))
                        cnt = RD_REG_DWORD(&reg->isp25mq.req_q_out);
                else if (IS_P3P_TYPE(ha))
                        cnt = RD_REG_DWORD(&reg->isp82.req_q_out);
                else if (IS_FWI2_CAPABLE(ha))
                        cnt = RD_REG_DWORD(&reg->isp24.req_q_out);
                else if (IS_QLAFX00(ha))
                        cnt = RD_REG_DWORD(&reg->ispfx00.req_q_out);
                else
                        cnt = qla2x00_debounce_register(
                            ISP_REQ_Q_OUT(ha, &reg->isp));

                if  (req->ring_index < cnt)
                        req->cnt = cnt - req->ring_index;
                else
                        req->cnt = req->length -
                            (req->ring_index - cnt);
        }
        if (req->cnt < req_cnt + 2)
                goto queuing_error;

        if (sp) {
                handle = qla2xxx_get_next_handle(req);
                if (handle == 0) {
                        ql_log(ql_log_warn, vha, 0x700b,
                            "No room on outstanding cmd array.\n");
                        goto queuing_error;
                }

                /* Prep command array. */
                req->current_outstanding_cmd = handle;
                req->outstanding_cmds[handle] = sp;
                sp->handle = handle;
        }

        /* Prep packet */
        req->cnt -= req_cnt;
        pkt = req->ring_ptr;
        memset(pkt, 0, REQUEST_ENTRY_SIZE);
        if (IS_QLAFX00(ha)) {
                WRT_REG_BYTE((void __iomem *)&pkt->entry_count, req_cnt);
                WRT_REG_WORD((void __iomem *)&pkt->handle, handle);
        } else {
                pkt->entry_count = req_cnt;
                pkt->handle = handle;
        }

        return pkt;

queuing_error:
        qpair->tgt_counters.num_alloc_iocb_failed++;
        return pkt;
}

void *
qla2x00_alloc_iocbs_ready(struct qla_qpair *qpair, srb_t *sp)
{
        scsi_qla_host_t *vha = qpair->vha;

        if (qla2x00_reset_active(vha))
                return NULL;

        return __qla2x00_alloc_iocbs(qpair, sp);
}

void *
qla2x00_alloc_iocbs(struct scsi_qla_host *vha, srb_t *sp)
{
        return __qla2x00_alloc_iocbs(vha->hw->base_qpair, sp);
}

static void
qla24xx_prli_iocb(srb_t *sp, struct logio_entry_24xx *logio)
{
        struct srb_iocb *lio = &sp->u.iocb_cmd;

        logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
        logio->control_flags = cpu_to_le16(LCF_COMMAND_PRLI);
        if (lio->u.logio.flags & SRB_LOGIN_NVME_PRLI) {
                logio->control_flags |= LCF_NVME_PRLI;
                if (sp->vha->flags.nvme_first_burst)
                        logio->io_parameter[0] = NVME_PRLI_SP_FIRST_BURST;
        }

        logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        logio->port_id[0] = sp->fcport->d_id.b.al_pa;
        logio->port_id[1] = sp->fcport->d_id.b.area;
        logio->port_id[2] = sp->fcport->d_id.b.domain;
        logio->vp_index = sp->vha->vp_idx;
}

static void
qla24xx_login_iocb(srb_t *sp, struct logio_entry_24xx *logio)
{
        struct srb_iocb *lio = &sp->u.iocb_cmd;

        logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
        if (lio->u.logio.flags & SRB_LOGIN_PRLI_ONLY) {
                logio->control_flags = cpu_to_le16(LCF_COMMAND_PRLI);
        } else {
                logio->control_flags = cpu_to_le16(LCF_COMMAND_PLOGI);
                if (lio->u.logio.flags & SRB_LOGIN_COND_PLOGI)
                        logio->control_flags |= cpu_to_le16(LCF_COND_PLOGI);
                if (lio->u.logio.flags & SRB_LOGIN_SKIP_PRLI)
                        logio->control_flags |= cpu_to_le16(LCF_SKIP_PRLI);
        }
        logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        logio->port_id[0] = sp->fcport->d_id.b.al_pa;
        logio->port_id[1] = sp->fcport->d_id.b.area;
        logio->port_id[2] = sp->fcport->d_id.b.domain;
        logio->vp_index = sp->vha->vp_idx;
}

static void
qla2x00_login_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->vha->hw;
        struct srb_iocb *lio = &sp->u.iocb_cmd;
        uint16_t opts;

        mbx->entry_type = MBX_IOCB_TYPE;
        SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
        mbx->mb0 = cpu_to_le16(MBC_LOGIN_FABRIC_PORT);
        opts = lio->u.logio.flags & SRB_LOGIN_COND_PLOGI ? BIT_0 : 0;
        opts |= lio->u.logio.flags & SRB_LOGIN_SKIP_PRLI ? BIT_1 : 0;
        if (HAS_EXTENDED_IDS(ha)) {
                mbx->mb1 = cpu_to_le16(sp->fcport->loop_id);
                mbx->mb10 = cpu_to_le16(opts);
        } else {
                mbx->mb1 = cpu_to_le16((sp->fcport->loop_id << 8) | opts);
        }
        mbx->mb2 = cpu_to_le16(sp->fcport->d_id.b.domain);
        mbx->mb3 = cpu_to_le16(sp->fcport->d_id.b.area << 8 |
            sp->fcport->d_id.b.al_pa);
        mbx->mb9 = cpu_to_le16(sp->vha->vp_idx);
}

static void
qla24xx_logout_iocb(srb_t *sp, struct logio_entry_24xx *logio)
{
        u16 control_flags = LCF_COMMAND_LOGO;
        logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;

        if (sp->fcport->explicit_logout) {
                control_flags |= LCF_EXPL_LOGO|LCF_FREE_NPORT;
        } else {
                control_flags |= LCF_IMPL_LOGO;

                if (!sp->fcport->keep_nport_handle)
                        control_flags |= LCF_FREE_NPORT;
        }

        logio->control_flags = cpu_to_le16(control_flags);
        logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        logio->port_id[0] = sp->fcport->d_id.b.al_pa;
        logio->port_id[1] = sp->fcport->d_id.b.area;
        logio->port_id[2] = sp->fcport->d_id.b.domain;
        logio->vp_index = sp->vha->vp_idx;
}

static void
qla2x00_logout_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->vha->hw;

        mbx->entry_type = MBX_IOCB_TYPE;
        SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
        mbx->mb0 = cpu_to_le16(MBC_LOGOUT_FABRIC_PORT);
        mbx->mb1 = HAS_EXTENDED_IDS(ha) ?
            cpu_to_le16(sp->fcport->loop_id) :
            cpu_to_le16(sp->fcport->loop_id << 8);
        mbx->mb2 = cpu_to_le16(sp->fcport->d_id.b.domain);
        mbx->mb3 = cpu_to_le16(sp->fcport->d_id.b.area << 8 |
            sp->fcport->d_id.b.al_pa);
        mbx->mb9 = cpu_to_le16(sp->vha->vp_idx);
        /* Implicit: mbx->mbx10 = 0. */
}

static void
qla24xx_adisc_iocb(srb_t *sp, struct logio_entry_24xx *logio)
{
        logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
        logio->control_flags = cpu_to_le16(LCF_COMMAND_ADISC);
        logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        logio->vp_index = sp->vha->vp_idx;
}

static void
qla2x00_adisc_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->vha->hw;

        mbx->entry_type = MBX_IOCB_TYPE;
        SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
        mbx->mb0 = cpu_to_le16(MBC_GET_PORT_DATABASE);
        if (HAS_EXTENDED_IDS(ha)) {
                mbx->mb1 = cpu_to_le16(sp->fcport->loop_id);
                mbx->mb10 = cpu_to_le16(BIT_0);
        } else {
                mbx->mb1 = cpu_to_le16((sp->fcport->loop_id << 8) | BIT_0);
        }
        mbx->mb2 = cpu_to_le16(MSW(ha->async_pd_dma));
        mbx->mb3 = cpu_to_le16(LSW(ha->async_pd_dma));
        mbx->mb6 = cpu_to_le16(MSW(MSD(ha->async_pd_dma)));
        mbx->mb7 = cpu_to_le16(LSW(MSD(ha->async_pd_dma)));
        mbx->mb9 = cpu_to_le16(sp->vha->vp_idx);
}

static void
qla24xx_tm_iocb(srb_t *sp, struct tsk_mgmt_entry *tsk)
{
        uint32_t flags;
        uint64_t lun;
        struct fc_port *fcport = sp->fcport;
        scsi_qla_host_t *vha = fcport->vha;
        struct qla_hw_data *ha = vha->hw;
        struct srb_iocb *iocb = &sp->u.iocb_cmd;
        struct req_que *req = vha->req;

        flags = iocb->u.tmf.flags;
        lun = iocb->u.tmf.lun;

        tsk->entry_type = TSK_MGMT_IOCB_TYPE;
        tsk->entry_count = 1;
        tsk->handle = MAKE_HANDLE(req->id, tsk->handle);
        tsk->nport_handle = cpu_to_le16(fcport->loop_id);
        tsk->timeout = cpu_to_le16(ha->r_a_tov / 10 * 2);
        tsk->control_flags = cpu_to_le32(flags);
        tsk->port_id[0] = fcport->d_id.b.al_pa;
        tsk->port_id[1] = fcport->d_id.b.area;
        tsk->port_id[2] = fcport->d_id.b.domain;
        tsk->vp_index = fcport->vha->vp_idx;

        if (flags == TCF_LUN_RESET) {
                int_to_scsilun(lun, &tsk->lun);
                host_to_fcp_swap((uint8_t *)&tsk->lun,
                        sizeof(tsk->lun));
        }
}

void qla2x00_init_timer(srb_t *sp, unsigned long tmo)
{
        timer_setup(&sp->u.iocb_cmd.timer, qla2x00_sp_timeout, 0);
        sp->u.iocb_cmd.timer.expires = jiffies + tmo * HZ;
        sp->free = qla2x00_sp_free;
        if (IS_QLAFX00(sp->vha->hw) && sp->type == SRB_FXIOCB_DCMD)
                init_completion(&sp->u.iocb_cmd.u.fxiocb.fxiocb_comp);
        sp->start_timer = 1;
}

static void qla2x00_els_dcmd_sp_free(srb_t *sp)
{
        struct srb_iocb *elsio = &sp->u.iocb_cmd;

        kfree(sp->fcport);

        if (elsio->u.els_logo.els_logo_pyld)
                dma_free_coherent(&sp->vha->hw->pdev->dev, DMA_POOL_SIZE,
                    elsio->u.els_logo.els_logo_pyld,
                    elsio->u.els_logo.els_logo_pyld_dma);

        del_timer(&elsio->timer);
        qla2x00_rel_sp(sp);
}

static void
qla2x00_els_dcmd_iocb_timeout(void *data)
{
        srb_t *sp = data;
        fc_port_t *fcport = sp->fcport;
        struct scsi_qla_host *vha = sp->vha;
        struct srb_iocb *lio = &sp->u.iocb_cmd;
        unsigned long flags = 0;
        int res, h;

        ql_dbg(ql_dbg_io, vha, 0x3069,
            "%s Timeout, hdl=%x, portid=%02x%02x%02x\n",
            sp->name, sp->handle, fcport->d_id.b.domain, fcport->d_id.b.area,
            fcport->d_id.b.al_pa);

        /* Abort the exchange */
        res = qla24xx_async_abort_cmd(sp, false);
        if (res) {
                ql_dbg(ql_dbg_io, vha, 0x3070,
                    "mbx abort_command failed.\n");
                spin_lock_irqsave(sp->qpair->qp_lock_ptr, flags);
                for (h = 1; h < sp->qpair->req->num_outstanding_cmds; h++) {
                        if (sp->qpair->req->outstanding_cmds[h] == sp) {
                                sp->qpair->req->outstanding_cmds[h] = NULL;
                                break;
                        }
                }
                spin_unlock_irqrestore(sp->qpair->qp_lock_ptr, flags);
                complete(&lio->u.els_logo.comp);
        } else {
                ql_dbg(ql_dbg_io, vha, 0x3071,
                    "mbx abort_command success.\n");
        }
}

static void qla2x00_els_dcmd_sp_done(srb_t *sp, int res)
{
        fc_port_t *fcport = sp->fcport;
        struct srb_iocb *lio = &sp->u.iocb_cmd;
        struct scsi_qla_host *vha = sp->vha;

        ql_dbg(ql_dbg_io, vha, 0x3072,
            "%s hdl=%x, portid=%02x%02x%02x done\n",
            sp->name, sp->handle, fcport->d_id.b.domain,
            fcport->d_id.b.area, fcport->d_id.b.al_pa);

        complete(&lio->u.els_logo.comp);
}

int
qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
    port_id_t remote_did)
{
        srb_t *sp;
        fc_port_t *fcport = NULL;
        struct srb_iocb *elsio = NULL;
        struct qla_hw_data *ha = vha->hw;
        struct els_logo_payload logo_pyld;
        int rval = QLA_SUCCESS;

        fcport = qla2x00_alloc_fcport(vha, GFP_KERNEL);
        if (!fcport) {
               ql_log(ql_log_info, vha, 0x70e5, "fcport allocation failed\n");
               return -ENOMEM;
        }

        /* Alloc SRB structure */
        sp = qla2x00_get_sp(vha, fcport, GFP_KERNEL);
        if (!sp) {
                kfree(fcport);
                ql_log(ql_log_info, vha, 0x70e6,
                 "SRB allocation failed\n");
                return -ENOMEM;
        }

        elsio = &sp->u.iocb_cmd;
        fcport->loop_id = 0xFFFF;
        fcport->d_id.b.domain = remote_did.b.domain;
        fcport->d_id.b.area = remote_did.b.area;
        fcport->d_id.b.al_pa = remote_did.b.al_pa;

        ql_dbg(ql_dbg_io, vha, 0x3073, "portid=%02x%02x%02x done\n",
            fcport->d_id.b.domain, fcport->d_id.b.area, fcport->d_id.b.al_pa);

        sp->type = SRB_ELS_DCMD;
        sp->name = "ELS_DCMD";
        sp->fcport = fcport;
        elsio->timeout = qla2x00_els_dcmd_iocb_timeout;
        qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT);
        init_completion(&sp->u.iocb_cmd.u.els_logo.comp);
        sp->done = qla2x00_els_dcmd_sp_done;
        sp->free = qla2x00_els_dcmd_sp_free;

        elsio->u.els_logo.els_logo_pyld = dma_alloc_coherent(&ha->pdev->dev,
                            DMA_POOL_SIZE, &elsio->u.els_logo.els_logo_pyld_dma,
                            GFP_KERNEL);

        if (!elsio->u.els_logo.els_logo_pyld) {
                sp->free(sp);
                return QLA_FUNCTION_FAILED;
        }

        memset(&logo_pyld, 0, sizeof(struct els_logo_payload));

        elsio->u.els_logo.els_cmd = els_opcode;
        logo_pyld.opcode = els_opcode;
        logo_pyld.s_id[0] = vha->d_id.b.al_pa;
        logo_pyld.s_id[1] = vha->d_id.b.area;
        logo_pyld.s_id[2] = vha->d_id.b.domain;
        host_to_fcp_swap(logo_pyld.s_id, sizeof(uint32_t));
        memcpy(&logo_pyld.wwpn, vha->port_name, WWN_SIZE);

        memcpy(elsio->u.els_logo.els_logo_pyld, &logo_pyld,
            sizeof(struct els_logo_payload));
        ql_dbg(ql_dbg_disc + ql_dbg_buffer, vha, 0x3075, "LOGO buffer:");
        ql_dump_buffer(ql_dbg_disc + ql_dbg_buffer, vha, 0x010a,
                       elsio->u.els_logo.els_logo_pyld,
                       sizeof(*elsio->u.els_logo.els_logo_pyld));

        rval = qla2x00_start_sp(sp);
        if (rval != QLA_SUCCESS) {
                sp->free(sp);
                return QLA_FUNCTION_FAILED;
        }

        ql_dbg(ql_dbg_io, vha, 0x3074,
            "%s LOGO sent, hdl=%x, loopid=%x, portid=%02x%02x%02x.\n",
            sp->name, sp->handle, fcport->loop_id, fcport->d_id.b.domain,
            fcport->d_id.b.area, fcport->d_id.b.al_pa);

        wait_for_completion(&elsio->u.els_logo.comp);

        sp->free(sp);
        return rval;
}

static void
qla24xx_els_logo_iocb(srb_t *sp, struct els_entry_24xx *els_iocb)
{
        scsi_qla_host_t *vha = sp->vha;
        struct srb_iocb *elsio = &sp->u.iocb_cmd;

        els_iocb->entry_type = ELS_IOCB_TYPE;
        els_iocb->entry_count = 1;
        els_iocb->sys_define = 0;
        els_iocb->entry_status = 0;
        els_iocb->handle = sp->handle;
        els_iocb->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        els_iocb->tx_dsd_count = 1;
        els_iocb->vp_index = vha->vp_idx;
        els_iocb->sof_type = EST_SOFI3;
        els_iocb->rx_dsd_count = 0;
        els_iocb->opcode = elsio->u.els_logo.els_cmd;

        els_iocb->port_id[0] = sp->fcport->d_id.b.al_pa;
        els_iocb->port_id[1] = sp->fcport->d_id.b.area;
        els_iocb->port_id[2] = sp->fcport->d_id.b.domain;
        /* For SID the byte order is different than DID */
        els_iocb->s_id[1] = vha->d_id.b.al_pa;
        els_iocb->s_id[2] = vha->d_id.b.area;
        els_iocb->s_id[0] = vha->d_id.b.domain;

        if (elsio->u.els_logo.els_cmd == ELS_DCMD_PLOGI) {
                els_iocb->control_flags = 0;
                els_iocb->tx_byte_count = els_iocb->tx_len =
                        cpu_to_le32(sizeof(struct els_plogi_payload));
                put_unaligned_le64(elsio->u.els_plogi.els_plogi_pyld_dma,
                                   &els_iocb->tx_address);
                els_iocb->rx_dsd_count = 1;
                els_iocb->rx_byte_count = els_iocb->rx_len =
                        cpu_to_le32(sizeof(struct els_plogi_payload));
                put_unaligned_le64(elsio->u.els_plogi.els_resp_pyld_dma,
                                   &els_iocb->rx_address);

                ql_dbg(ql_dbg_io + ql_dbg_buffer, vha, 0x3073,
                    "PLOGI ELS IOCB:\n");
                ql_dump_buffer(ql_log_info, vha, 0x0109,
                    (uint8_t *)els_iocb,
                    sizeof(*els_iocb));
        } else {
                els_iocb->control_flags = 1 << 13;
                els_iocb->tx_byte_count =
                        cpu_to_le32(sizeof(struct els_logo_payload));
                put_unaligned_le64(elsio->u.els_logo.els_logo_pyld_dma,
                                   &els_iocb->tx_address);
                els_iocb->tx_len = cpu_to_le32(sizeof(struct els_logo_payload));

                els_iocb->rx_byte_count = 0;
                els_iocb->rx_address = 0;
                els_iocb->rx_len = 0;
                ql_dbg(ql_dbg_io + ql_dbg_buffer, vha, 0x3076,
                       "LOGO ELS IOCB:");
                ql_dump_buffer(ql_log_info, vha, 0x010b,
                               els_iocb,
                               sizeof(*els_iocb));
        }

        sp->vha->qla_stats.control_requests++;
}

static void
qla2x00_els_dcmd2_iocb_timeout(void *data)
{
        srb_t *sp = data;
        fc_port_t *fcport = sp->fcport;
        struct scsi_qla_host *vha = sp->vha;
        unsigned long flags = 0;
        int res, h;

        ql_dbg(ql_dbg_io + ql_dbg_disc, vha, 0x3069,
            "%s hdl=%x ELS Timeout, %8phC portid=%06x\n",
            sp->name, sp->handle, fcport->port_name, fcport->d_id.b24);

        /* Abort the exchange */
        res = qla24xx_async_abort_cmd(sp, false);
        ql_dbg(ql_dbg_io, vha, 0x3070,
            "mbx abort_command %s\n",
            (res == QLA_SUCCESS) ? "successful" : "failed");
        if (res) {
                spin_lock_irqsave(sp->qpair->qp_lock_ptr, flags);
                for (h = 1; h < sp->qpair->req->num_outstanding_cmds; h++) {
                        if (sp->qpair->req->outstanding_cmds[h] == sp) {
                                sp->qpair->req->outstanding_cmds[h] = NULL;
                                break;
                        }
                }
                spin_unlock_irqrestore(sp->qpair->qp_lock_ptr, flags);
                sp->done(sp, QLA_FUNCTION_TIMEOUT);
        }
}

void qla2x00_els_dcmd2_free(scsi_qla_host_t *vha, struct els_plogi *els_plogi)
{
        if (els_plogi->els_plogi_pyld)
                dma_free_coherent(&vha->hw->pdev->dev,
                                  els_plogi->tx_size,
                                  els_plogi->els_plogi_pyld,
                                  els_plogi->els_plogi_pyld_dma);

        if (els_plogi->els_resp_pyld)
                dma_free_coherent(&vha->hw->pdev->dev,
                                  els_plogi->rx_size,
                                  els_plogi->els_resp_pyld,
                                  els_plogi->els_resp_pyld_dma);
}

static void qla2x00_els_dcmd2_sp_done(srb_t *sp, int res)
{
        fc_port_t *fcport = sp->fcport;
        struct srb_iocb *lio = &sp->u.iocb_cmd;
        struct scsi_qla_host *vha = sp->vha;
        struct event_arg ea;
        struct qla_work_evt *e;
        struct fc_port *conflict_fcport;
        port_id_t cid;  /* conflict Nport id */
        u32 *fw_status = sp->u.iocb_cmd.u.els_plogi.fw_status;
        u16 lid;

        ql_dbg(ql_dbg_disc, vha, 0x3072,
            "%s ELS done rc %d hdl=%x, portid=%06x %8phC\n",
            sp->name, res, sp->handle, fcport->d_id.b24, fcport->port_name);

        fcport->flags &= ~(FCF_ASYNC_SENT|FCF_ASYNC_ACTIVE);
        del_timer(&sp->u.iocb_cmd.timer);

        if (sp->flags & SRB_WAKEUP_ON_COMP)
                complete(&lio->u.els_plogi.comp);
        else {
                switch (fw_status[0]) {
                case CS_DATA_UNDERRUN:
                case CS_COMPLETE:
                        memset(&ea, 0, sizeof(ea));
                        ea.fcport = fcport;
                        ea.rc = res;
                        qla_handle_els_plogi_done(vha, &ea);
                        break;

                case CS_IOCB_ERROR:
                        switch (fw_status[1]) {
                        case LSC_SCODE_PORTID_USED:
                                lid = fw_status[2] & 0xffff;
                                qlt_find_sess_invalidate_other(vha,
                                    wwn_to_u64(fcport->port_name),
                                    fcport->d_id, lid, &conflict_fcport);
                                if (conflict_fcport) {
                                        /*
                                         * Another fcport shares the same
                                         * loop_id & nport id; conflict
                                         * fcport needs to finish cleanup
                                         * before this fcport can proceed
                                         * to login.
                                         */
                                        conflict_fcport->conflict = fcport;
                                        fcport->login_pause = 1;
                                        ql_dbg(ql_dbg_disc, vha, 0x20ed,
                                            "%s %d %8phC pid %06x inuse with lid %#x post gidpn\n",
                                            __func__, __LINE__,
                                            fcport->port_name,
                                            fcport->d_id.b24, lid);
                                } else {
                                        ql_dbg(ql_dbg_disc, vha, 0x20ed,
                                            "%s %d %8phC pid %06x inuse with lid %#x sched del\n",
                                            __func__, __LINE__,
                                            fcport->port_name,
                                            fcport->d_id.b24, lid);
                                        qla2x00_clear_loop_id(fcport);
                                        set_bit(lid, vha->hw->loop_id_map);
                                        fcport->loop_id = lid;
                                        fcport->keep_nport_handle = 0;
                                        qlt_schedule_sess_for_deletion(fcport);
                                }
                                break;

                        case LSC_SCODE_NPORT_USED:
                                cid.b.domain = (fw_status[2] >> 16) & 0xff;
                                cid.b.area   = (fw_status[2] >>  8) & 0xff;
                                cid.b.al_pa  = fw_status[2] & 0xff;
                                cid.b.rsvd_1 = 0;

                                ql_dbg(ql_dbg_disc, vha, 0x20ec,
                                    "%s %d %8phC lid %#x in use with pid %06x post gnl\n",
                                    __func__, __LINE__, fcport->port_name,
                                    fcport->loop_id, cid.b24);
                                set_bit(fcport->loop_id,
                                    vha->hw->loop_id_map);
                                fcport->loop_id = FC_NO_LOOP_ID;
                                qla24xx_post_gnl_work(vha, fcport);
                                break;

                        case LSC_SCODE_NOXCB:
                                vha->hw->exch_starvation++;
                                if (vha->hw->exch_starvation > 5) {
                                        ql_log(ql_log_warn, vha, 0xd046,
                                            "Exchange starvation. Resetting RISC\n");
                                        vha->hw->exch_starvation = 0;
                                        set_bit(ISP_ABORT_NEEDED,
                                            &vha->dpc_flags);
                                        qla2xxx_wake_dpc(vha);
                                }
                                /* fall through */
                        default:
                                ql_dbg(ql_dbg_disc, vha, 0x20eb,
                                    "%s %8phC cmd error fw_status 0x%x 0x%x 0x%x\n",
                                    __func__, sp->fcport->port_name,
                                    fw_status[0], fw_status[1], fw_status[2]);

                                fcport->flags &= ~FCF_ASYNC_SENT;
                                qla2x00_set_fcport_disc_state(fcport,
                                    DSC_LOGIN_FAILED);
                                set_bit(RELOGIN_NEEDED, &vha->dpc_flags);
                                break;
                        }
                        break;

                default:
                        ql_dbg(ql_dbg_disc, vha, 0x20eb,
                            "%s %8phC cmd error 2 fw_status 0x%x 0x%x 0x%x\n",
                            __func__, sp->fcport->port_name,
                            fw_status[0], fw_status[1], fw_status[2]);

                        sp->fcport->flags &= ~FCF_ASYNC_SENT;
                        qla2x00_set_fcport_disc_state(fcport, DSC_LOGIN_FAILED);
                        set_bit(RELOGIN_NEEDED, &vha->dpc_flags);
                        break;
                }

                e = qla2x00_alloc_work(vha, QLA_EVT_UNMAP);
                if (!e) {
                        struct srb_iocb *elsio = &sp->u.iocb_cmd;

                        qla2x00_els_dcmd2_free(vha, &elsio->u.els_plogi);
                        sp->free(sp);
                        return;
                }
                e->u.iosb.sp = sp;
                qla2x00_post_work(vha, e);
        }
}

int
qla24xx_els_dcmd2_iocb(scsi_qla_host_t *vha, int els_opcode,
    fc_port_t *fcport, bool wait)
{
        srb_t *sp;
        struct srb_iocb *elsio = NULL;
        struct qla_hw_data *ha = vha->hw;
        int rval = QLA_SUCCESS;
        void    *ptr, *resp_ptr;

        /* Alloc SRB structure */
        sp = qla2x00_get_sp(vha, fcport, GFP_KERNEL);
        if (!sp) {
                ql_log(ql_log_info, vha, 0x70e6,
                 "SRB allocation failed\n");
                fcport->flags &= ~FCF_ASYNC_ACTIVE;
                return -ENOMEM;
        }

        fcport->flags |= FCF_ASYNC_SENT;
        qla2x00_set_fcport_disc_state(fcport, DSC_LOGIN_PEND);
        elsio = &sp->u.iocb_cmd;
        ql_dbg(ql_dbg_io, vha, 0x3073,
            "Enter: PLOGI portid=%06x\n", fcport->d_id.b24);

        sp->type = SRB_ELS_DCMD;
        sp->name = "ELS_DCMD";
        sp->fcport = fcport;

        elsio->timeout = qla2x00_els_dcmd2_iocb_timeout;
        init_completion(&elsio->u.els_plogi.comp);
        if (wait)
                sp->flags = SRB_WAKEUP_ON_COMP;

        qla2x00_init_timer(sp, ELS_DCMD_TIMEOUT + 2);

        sp->done = qla2x00_els_dcmd2_sp_done;
        elsio->u.els_plogi.tx_size = elsio->u.els_plogi.rx_size = DMA_POOL_SIZE;

        ptr = elsio->u.els_plogi.els_plogi_pyld =
            dma_alloc_coherent(&ha->pdev->dev, DMA_POOL_SIZE,
                &elsio->u.els_plogi.els_plogi_pyld_dma, GFP_KERNEL);

        if (!elsio->u.els_plogi.els_plogi_pyld) {
                rval = QLA_FUNCTION_FAILED;
                goto out;
        }

        resp_ptr = elsio->u.els_plogi.els_resp_pyld =
            dma_alloc_coherent(&ha->pdev->dev, DMA_POOL_SIZE,
                &elsio->u.els_plogi.els_resp_pyld_dma, GFP_KERNEL);

        if (!elsio->u.els_plogi.els_resp_pyld) {
                rval = QLA_FUNCTION_FAILED;
                goto out;
        }

        ql_dbg(ql_dbg_io, vha, 0x3073, "PLOGI %p %p\n", ptr, resp_ptr);

        memset(ptr, 0, sizeof(struct els_plogi_payload));
        memset(resp_ptr, 0, sizeof(struct els_plogi_payload));
        memcpy(elsio->u.els_plogi.els_plogi_pyld->data,
            &ha->plogi_els_payld.data,
            sizeof(elsio->u.els_plogi.els_plogi_pyld->data));

        elsio->u.els_plogi.els_cmd = els_opcode;
        elsio->u.els_plogi.els_plogi_pyld->opcode = els_opcode;

        ql_dbg(ql_dbg_disc + ql_dbg_buffer, vha, 0x3073, "PLOGI buffer:\n");
        ql_dump_buffer(ql_dbg_disc + ql_dbg_buffer, vha, 0x0109,
            (uint8_t *)elsio->u.els_plogi.els_plogi_pyld,
            sizeof(*elsio->u.els_plogi.els_plogi_pyld));

        rval = qla2x00_start_sp(sp);
        if (rval != QLA_SUCCESS) {
                rval = QLA_FUNCTION_FAILED;
        } else {
                ql_dbg(ql_dbg_disc, vha, 0x3074,
                    "%s PLOGI sent, hdl=%x, loopid=%x, to port_id %06x from port_id %06x\n",
                    sp->name, sp->handle, fcport->loop_id,
                    fcport->d_id.b24, vha->d_id.b24);
        }

        if (wait) {
                wait_for_completion(&elsio->u.els_plogi.comp);

                if (elsio->u.els_plogi.comp_status != CS_COMPLETE)
                        rval = QLA_FUNCTION_FAILED;
        } else {