/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2011 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"

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

#include <scsi/scsi_tcq.h>

static void qla25xx_set_que(srb_t *, struct rsp_que **);
/**
 * qla2x00_get_cmd_direction() - Determine control_flag data direction.
 * @cmd: 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);

        cflags = 0;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cflags = CF_WRITE;
                sp->fcport->vha->hw->qla_stats.output_bytes +=
                    scsi_bufflen(cmd);
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cflags = CF_READ;
                sp->fcport->vha->hw->qla_stats.input_bytes +=
                    scsi_bufflen(cmd);
        }
        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.
 * @ha: 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. */
        *((uint32_t *)(&cont_pkt->entry_type)) =
            __constant_cpu_to_le32(CONTINUE_TYPE);

        return (cont_pkt);
}

/**
 * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 * @ha: HA context
 *
 * 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. */
        *((uint32_t *)(&cont_pkt->entry_type)) =
            __constant_cpu_to_le32(CONTINUE_A64_TYPE);

        return (cont_pkt);
}

static 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 only support T10 DIF right now */
        if (guard != SHOST_DIX_GUARD_CRC) {
                ql_dbg(ql_dbg_io, sp->fcport->vha, 0x3007,
                    "Unsupported guard: %d for cmd=%p.\n", guard, cmd);
                return 0;
        }

        /* 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:
                *fw_prot_opts |= PO_MODE_DIF_PASS;
                break;
        case SCSI_PROT_WRITE_PASS:
                *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;
        uint32_t        *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 */
        *((uint32_t *)(&cmd_pkt->entry_type)) =
            __constant_cpu_to_le32(COMMAND_TYPE);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = __constant_cpu_to_le32(0);
                return;
        }

        vha = sp->fcport->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 = 3;
        cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;

        /* 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 = (uint32_t *)&cont_pkt->dseg_0_address;
                        avail_dsds = 7;
                }

                *cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
                *cur_dsd++ = cpu_to_le32(sg_dma_len(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;
        uint32_t        *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 */
        *((uint32_t *)(&cmd_pkt->entry_type)) =
            __constant_cpu_to_le32(COMMAND_A64_TYPE);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = __constant_cpu_to_le32(0);
                return;
        }

        vha = sp->fcport->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 = 2;
        cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;

        /* Load data segments */
        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                dma_addr_t      sle_dma;
                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 = (uint32_t *)cont_pkt->dseg_0_address;
                        avail_dsds = 5;
                }

                sle_dma = sg_dma_address(sg);
                *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
                avail_dsds--;
        }
}

/**
 * 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             ret, nseg;
        unsigned long   flags;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        uint32_t        *clr_ptr;
        uint32_t        index;
        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;
        char            tag[2];

        /* Setup device pointers. */
        ret = 0;
        vha = sp->fcport->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, req, rsp, 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);

        /* Check for room in outstanding command list. */
        handle = req->current_outstanding_cmd;
        for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
                handle++;
                if (handle == MAX_OUTSTANDING_COMMANDS)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        break;
        }
        if (index == MAX_OUTSTANDING_COMMANDS)
                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 (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);

        /* Update tagged queuing modifier */
        if (scsi_populate_tag_msg(cmd, tag)) {
                switch (tag[0]) {
                case HEAD_OF_QUEUE_TAG:
                        cmd_pkt->control_flags =
                            __constant_cpu_to_le16(CF_HEAD_TAG);
                        break;
                case ORDERED_QUEUE_TAG:
                        cmd_pkt->control_flags =
                            __constant_cpu_to_le16(CF_ORDERED_TAG);
                        break;
                default:
                        cmd_pkt->control_flags =
                            __constant_cpu_to_le16(CF_SIMPLE_TAG);
                        break;
                }
        }

        /* 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
 */
static void
qla2x00_start_iocbs(struct scsi_qla_host *vha, struct req_que *req)
{
        struct qla_hw_data *ha = vha->hw;
        device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);

        if (IS_QLA82XX(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_QLA83XX(ha)) {
                        WRT_REG_DWORD(req->req_q_in, req->ring_index);
                        RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
                } 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.
 * @ha: HA context
 * @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 req_que *req,
                        struct rsp_que *rsp, uint16_t loop_id,
                        uint16_t lun, uint8_t type)
{
        mrk_entry_t *mrk;
        struct mrk_entry_24xx *mrk24;
        struct qla_hw_data *ha = vha->hw;
        scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);

        mrk24 = NULL;
        req = ha->req_q_map[0];
        mrk = (mrk_entry_t *)qla2x00_alloc_iocbs(vha, 0);
        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);
                        mrk24->lun[1] = LSB(lun);
                        mrk24->lun[2] = MSB(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(lun);
                }
        }
        wmb();

        qla2x00_start_iocbs(vha, req);

        return (QLA_SUCCESS);
}

int
qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
                struct rsp_que *rsp, uint16_t loop_id, uint16_t lun,
                uint8_t type)
{
        int ret;
        unsigned long flags = 0;

        spin_lock_irqsave(&vha->hw->hardware_lock, flags);
        ret = __qla2x00_marker(vha, req, rsp, loop_id, lun, type);
        spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);

        return (ret);
}

/**
 * qla24xx_calc_iocbs() - 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.
 */
inline uint16_t
qla24xx_calc_iocbs(scsi_qla_host_t *vha, uint16_t dsds)
{
        uint16_t iocbs;

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

static inline int
qla24xx_build_scsi_type_6_iocbs(srb_t *sp, struct cmd_type_6 *cmd_pkt,
        uint16_t tot_dsds)
{
        uint32_t *cur_dsd = NULL;
        scsi_qla_host_t *vha;
        struct qla_hw_data *ha;
        struct scsi_cmnd *cmd;
        struct  scatterlist *cur_seg;
        uint32_t *dsd_seg;
        void *next_dsd;
        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 */
        *((uint32_t *)(&cmd_pkt->entry_type)) =
                __constant_cpu_to_le32(COMMAND_TYPE_6);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = __constant_cpu_to_le32(0);
                return 0;
        }

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

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->control_flags =
                    __constant_cpu_to_le16(CF_WRITE_DATA);
                ha->qla_stats.output_bytes += scsi_bufflen(cmd);
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->control_flags =
                    __constant_cpu_to_le16(CF_READ_DATA);
                ha->qla_stats.input_bytes += scsi_bufflen(cmd);
        }

        cur_seg = scsi_sglist(cmd);
        ctx = GET_CMD_CTX_SP(sp);

        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;
                        dsd_seg = (uint32_t *)&cmd_pkt->fcp_data_dseg_address;
                        *dsd_seg++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
                        *dsd_seg++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
                        cmd_pkt->fcp_data_dseg_len = cpu_to_le32(dsd_list_len);
                } else {
                        *cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = cpu_to_le32(dsd_list_len);
                }
                cur_dsd = (uint32_t *)next_dsd;
                while (avail_dsds) {
                        dma_addr_t      sle_dma;

                        sle_dma = sg_dma_address(cur_seg);
                        *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                        *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                        *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
                        cur_seg = sg_next(cur_seg);
                        avail_dsds--;
                }
        }

        /* Null termination */
        *cur_dsd++ =  0;
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        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.
 */
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
 */
inline void
qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
    uint16_t tot_dsds)
{
        uint16_t        avail_dsds;
        uint32_t        *cur_dsd;
        scsi_qla_host_t *vha;
        struct scsi_cmnd *cmd;
        struct scatterlist *sg;
        int i;
        struct req_que *req;

        cmd = GET_CMD_SP(sp);

        /* Update entry type to indicate Command Type 3 IOCB */
        *((uint32_t *)(&cmd_pkt->entry_type)) =
            __constant_cpu_to_le32(COMMAND_TYPE_7);

        /* No data transfer */
        if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
                cmd_pkt->byte_count = __constant_cpu_to_le32(0);
                return;
        }

        vha = sp->fcport->vha;
        req = vha->req;

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->task_mgmt_flags =
                    __constant_cpu_to_le16(TMF_WRITE_DATA);
                sp->fcport->vha->hw->qla_stats.output_bytes +=
                    scsi_bufflen(cmd);
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->task_mgmt_flags =
                    __constant_cpu_to_le16(TMF_READ_DATA);
                sp->fcport->vha->hw->qla_stats.input_bytes +=
                    scsi_bufflen(cmd);
        }

        /* One DSD is available in the Command Type 3 IOCB */
        avail_dsds = 1;
        cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;

        /* Load data segments */

        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                dma_addr_t      sle_dma;
                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 = (uint32_t *)cont_pkt->dseg_0_address;
                        avail_dsds = 5;
                }

                sle_dma = sg_dma_address(sg);
                *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(sg_dma_len(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);
        scsi_qla_host_t *vha = shost_priv(cmd->device->host);

        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 = __constant_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 = __constant_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;
        }

        ql_dbg(ql_dbg_io, vha, 0x3009,
            "Setting protection Tags: (BIG) ref tag = 0x%x, app tag = 0x%x, "
            "prot SG count %d, cmd lba 0x%x, prot_type=%u cmd=%p.\n",
            pkt->ref_tag, pkt->app_tag, protcnt, (int)scsi_get_lba(cmd),
            scsi_get_prot_type(cmd), cmd);
}

struct qla2_sgx {
        dma_addr_t              dma_addr;       /* OUT */
        uint32_t                dma_len;        /* OUT */

        uint32_t                tot_bytes;      /* IN */
        struct scatterlist      *cur_sg;        /* IN */

        /* for book keeping, bzero on initial invocation */
        uint32_t                bytes_consumed;
        uint32_t                num_bytes;
        uint32_t                tot_partial;

        /* for debugging */
        uint32_t                num_sg;
        srb_t                   *sp;
};

static 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;
}

static int
qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
        uint32_t *dsd, uint16_t tot_dsds)
{
        void *next_dsd;
        uint8_t avail_dsds = 0;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct scatterlist *sg_prot;
        uint32_t *cur_dsd = dsd;
        uint16_t        used_dsds = tot_dsds;

        uint32_t        prot_int;
        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 = GET_CMD_SP(sp);

        prot_int = cmd->device->sector_size;

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

        sg_prot = scsi_prot_sglist(cmd);

        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;
                        }

                        list_add_tail(&dsd_ptr->list,
                            &((struct crc_context *)sp->u.scmd.ctx)->dsd_list);

                        sp->flags |= SRB_CRC_CTX_DSD_VALID;

                        /* add new list to cmd iocb or last list */
                        *cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = dsd_list_len;
                        cur_dsd = (uint32_t *)next_dsd;
                }
                *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(sle_dma_len);
                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++ = 0;
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        return 0;
}

static int
qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp, uint32_t *dsd,
        uint16_t tot_dsds)
{
        void *next_dsd;
        uint8_t avail_dsds = 0;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct scatterlist *sg;
        uint32_t *cur_dsd = dsd;
        int     i;
        uint16_t        used_dsds = tot_dsds;
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        scsi_qla_host_t *vha = shost_priv(cmd->device->host);

        uint8_t         *cp;

        scsi_for_each_sg(cmd, sg, tot_dsds, i) {
                dma_addr_t      sle_dma;

                /* 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;
                        }

                        list_add_tail(&dsd_ptr->list,
                            &((struct crc_context *)sp->u.scmd.ctx)->dsd_list);

                        sp->flags |= SRB_CRC_CTX_DSD_VALID;

                        /* add new list to cmd iocb or last list */
                        *cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = dsd_list_len;
                        cur_dsd = (uint32_t *)next_dsd;
                }
                sle_dma = sg_dma_address(sg);
                ql_dbg(ql_dbg_io, vha, 0x300a,
                    "sg entry %d - addr=0x%x 0x%x, " "len=%d for cmd=%p.\n",
                    i, LSD(sle_dma), MSD(sle_dma), sg_dma_len(sg), cmd);
                *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
                avail_dsds--;

                if (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_PASS) {
                        cp = page_address(sg_page(sg)) + sg->offset;
                        ql_dbg(ql_dbg_io, vha, 0x300b,
                            "User data buffer=%p for cmd=%p.\n", cp, cmd);
                }
        }
        /* Null termination */
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        return 0;
}

static int
qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *ha, srb_t *sp,
                                                        uint32_t *dsd,
        uint16_t tot_dsds)
{
        void *next_dsd;
        uint8_t avail_dsds = 0;
        uint32_t dsd_list_len;
        struct dsd_dma *dsd_ptr;
        struct scatterlist *sg;
        int     i;
        struct scsi_cmnd *cmd;
        uint32_t *cur_dsd = dsd;
        uint16_t        used_dsds = tot_dsds;
        scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
        uint8_t         *cp;

        cmd = GET_CMD_SP(sp);
        scsi_for_each_prot_sg(cmd, sg, tot_dsds, i) {
                dma_addr_t      sle_dma;

                /* 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;
                        }

                        list_add_tail(&dsd_ptr->list,
                            &((struct crc_context *)sp->u.scmd.ctx)->dsd_list);

                        sp->flags |= SRB_CRC_CTX_DSD_VALID;

                        /* add new list to cmd iocb or last list */
                        *cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
                        *cur_dsd++ = dsd_list_len;
                        cur_dsd = (uint32_t *)next_dsd;
                }
                sle_dma = sg_dma_address(sg);
                if (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_PASS) {
                        ql_dbg(ql_dbg_io, vha, 0x3027,
                            "%s(): %p, sg_entry %d - "
                            "addr=0x%x0x%x, len=%d.\n",
                            __func__, cur_dsd, i,
                            LSD(sle_dma), MSD(sle_dma), sg_dma_len(sg));
                }
                *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));

                if (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_PASS) {
                        cp = page_address(sg_page(sg)) + sg->offset;
                        ql_dbg(ql_dbg_io, vha, 0x3028,
                            "%s(): Protection Data buffer = %p.\n", __func__,
                            cp);
                }
                avail_dsds--;
        }
        /* Null termination */
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        *cur_dsd++ = 0;
        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
 */
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)
{
        uint32_t                *cur_dsd, *fcp_dl;
        scsi_qla_host_t         *vha;
        struct scsi_cmnd        *cmd;
        struct scatterlist      *cur_seg;
        int                     sgc;
        uint32_t                total_bytes = 0;
        uint32_t                data_bytes;
        uint32_t                dif_bytes;
        uint8_t                 bundling = 1;
        uint16_t                blk_size;
        uint8_t                 *clr_ptr;
        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;
        char                    tag[2];

        cmd = GET_CMD_SP(sp);

        sgc = 0;
        /* Update entry type to indicate Command Type CRC_2 IOCB */
        *((uint32_t *)(&cmd_pkt->entry_type)) =
            __constant_cpu_to_le32(COMMAND_TYPE_CRC_2);

        vha = sp->fcport->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 = __constant_cpu_to_le32(0);
                return QLA_SUCCESS;
        }

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

        /* Set transfer direction */
        if (cmd->sc_data_direction == DMA_TO_DEVICE) {
                cmd_pkt->control_flags =
                    __constant_cpu_to_le16(CF_WRITE_DATA);
        } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
                cmd_pkt->control_flags =
                    __constant_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.ctx =
            dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC, &crc_ctx_dma);

        if (!crc_ctx_pkt)
                goto crc_queuing_error;

        /* Zero out CTX area. */
        clr_ptr = (uint8_t *)crc_ctx_pkt;
        memset(clr_ptr, 0, sizeof(*crc_ctx_pkt));

        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);

        cmd_pkt->crc_context_address[0] = cpu_to_le32(LSD(crc_ctx_dma));
        cmd_pkt->crc_context_address[1] = cpu_to_le32(MSD(crc_ctx_dma));
        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);
        cmd_pkt->fcp_cmnd_dseg_address[0] = cpu_to_le32(
            LSD(crc_ctx_dma + CRC_CONTEXT_FCPCMND_OFF));
        cmd_pkt->fcp_cmnd_dseg_address[1] = cpu_to_le32(
            MSD(crc_ctx_dma + CRC_CONTEXT_FCPCMND_OFF));
        fcp_cmnd->task_management = 0;

        /*
         * Update tagged queuing modifier if using command tag queuing
         */
        if (scsi_populate_tag_msg(cmd, tag)) {
                switch (tag[0]) {
                case HEAD_OF_QUEUE_TAG:
                    fcp_cmnd->task_attribute = TSK_HEAD_OF_QUEUE;
                    break;
                case ORDERED_QUEUE_TAG:
                    fcp_cmnd->task_attribute = TSK_ORDERED;
                    break;
                default:
                    fcp_cmnd->task_attribute = 0;
                    break;
                }
        } else {
                fcp_cmnd->task_attribute = 0;
        }

        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 */

        if (!bundling) {
                cur_dsd = (uint32_t *) &crc_ctx_pkt->u.nobundling.data_address;
        } 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 = (uint32_t *) &crc_ctx_pkt->u.bundling.data_address;
        }

        /* 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 = __constant_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 = __constant_cpu_to_le32(0);
                return QLA_SUCCESS;
        }
        /* Walks data segments */

        cmd_pkt->control_flags |=
            __constant_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))
                        goto crc_queuing_error;
        } else if (qla24xx_walk_and_build_sglist(ha, sp, cur_dsd,
            (tot_dsds - tot_prot_dsds)))
                goto crc_queuing_error;

        if (bundling && tot_prot_dsds) {
                /* Walks dif segments */
                cur_seg = scsi_prot_sglist(cmd);
                cmd_pkt->control_flags |=
                        __constant_cpu_to_le16(CF_DIF_SEG_DESCR_ENABLE);
                cur_dsd = (uint32_t *) &crc_ctx_pkt->u.bundling.dif_address;
                if (qla24xx_walk_and_build_prot_sglist(ha, sp, cur_dsd,
                    tot_prot_dsds))
                        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             ret, nseg;
        unsigned long   flags;
        uint32_t        *clr_ptr;
        uint32_t        index;
        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 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;
        char            tag[2];

        /* Setup device pointers. */
        ret = 0;

        qla25xx_set_que(sp, &rsp);
        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, req, rsp, 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);

        /* Check for room in outstanding command list. */
        handle = req->current_outstanding_cmd;
        for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
                handle++;
                if (handle == MAX_OUTSTANDING_COMMANDS)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        break;
        }
        if (index == MAX_OUTSTANDING_COMMANDS) {
                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 = 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->vp_idx;

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

        /* Update tagged queuing modifier -- default is TSK_SIMPLE (0). */
        if (scsi_populate_tag_msg(cmd, tag)) {
                switch (tag[0]) {
                case HEAD_OF_QUEUE_TAG:
                        cmd_pkt->task = TSK_HEAD_OF_QUEUE;
                        break;
                case ORDERED_QUEUE_TAG:
                        cmd_pkt->task = TSK_ORDERED;
                        break;
                }
        }

        /* 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);

        /* Set total data segment count. */
        cmd_pkt->entry_count = (uint8_t)req_cnt;
        /* Specify response queue number where completion should happen */
        cmd_pkt->entry_status = (uint8_t) rsp->id;
        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);
        RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);

        /* 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(&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                index;
        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;

#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. */

        qla25xx_set_que(sp, &rsp);
        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, req, rsp, 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);

        /* Check for room in outstanding command list. */
        handle = req->current_outstanding_cmd;
        for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
                handle++;
                if (handle == MAX_OUTSTANDING_COMMANDS)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        break;
        }

        if (index == MAX_OUTSTANDING_COMMANDS)
                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 = 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 = __constant_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);
        RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);

        /* 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(&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;
}


static void qla25xx_set_que(srb_t *sp, struct rsp_que **rsp)
{
        struct scsi_cmnd *cmd = GET_CMD_SP(sp);
        struct qla_hw_data *ha = sp->fcport->vha->hw;
        int affinity = cmd->request->cpu;

        if (ha->flags.cpu_affinity_enabled && affinity >= 0 &&
                affinity < ha->max_rsp_queues - 1)
                *rsp = ha->rsp_q_map[affinity + 1];
         else
                *rsp = ha->rsp_q_map[0];
}

/* Generic Control-SRB manipulation functions. */
void *
qla2x00_alloc_iocbs(scsi_qla_host_t *vha, srb_t *sp)
{
        struct qla_hw_data *ha = vha->hw;
        struct req_que *req = ha->req_q_map[0];
        device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
        uint32_t index, handle;
        request_t *pkt;
        uint16_t cnt, req_cnt;

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

        if (!sp)
                goto skip_cmd_array;

        /* Check for room in outstanding command list. */
        handle = req->current_outstanding_cmd;
        for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
                handle++;
                if (handle == MAX_OUTSTANDING_COMMANDS)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        break;
        }
        if (index == MAX_OUTSTANDING_COMMANDS) {
                ql_log(ql_log_warn, vha, 0x700b,
                    "No room on oustanding cmd array.\n");
                goto queuing_error;
        }

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

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

skip_cmd_array:
        /* Check for room on request queue. */
        if (req->cnt < req_cnt) {
                if (ha->mqenable || IS_QLA83XX(ha))
                        cnt = RD_REG_DWORD(&reg->isp25mq.req_q_out);
                else if (IS_QLA82XX(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
                        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)
                goto queuing_error;

        /* Prep packet */
        req->cnt -= req_cnt;
        pkt = req->ring_ptr;
        memset(pkt, 0, REQUEST_ENTRY_SIZE);
        pkt->entry_count = req_cnt;
        pkt->handle = handle;

queuing_error:
        return pkt;
}

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;
        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->fcport->vp_idx;
}

static void
qla2x00_login_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->fcport->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->fcport->vp_idx);
}

static void
qla24xx_logout_iocb(srb_t *sp, struct logio_entry_24xx *logio)
{
        logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
        logio->control_flags =
            cpu_to_le16(LCF_COMMAND_LOGO|LCF_IMPL_LOGO);
        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->fcport->vp_idx;
}

static void
qla2x00_logout_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->fcport->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->fcport->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->fcport->vp_idx;
}

static void
qla2x00_adisc_iocb(srb_t *sp, struct mbx_entry *mbx)
{
        struct qla_hw_data *ha = sp->fcport->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->fcport->vp_idx);
}

static void
qla24xx_tm_iocb(srb_t *sp, struct tsk_mgmt_entry *tsk)
{
        uint32_t flags;
        unsigned int 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->vp_idx;

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

static void
qla24xx_els_iocb(srb_t *sp, struct els_entry_24xx *els_iocb)
{
        struct fc_bsg_job *bsg_job = sp->u.bsg_job;

        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 = __constant_cpu_to_le16(bsg_job->request_payload.sg_cnt);
        els_iocb->vp_index = sp->fcport->vp_idx;
        els_iocb->sof_type = EST_SOFI3;
        els_iocb->rx_dsd_count = __constant_cpu_to_le16(bsg_job->reply_payload.sg_cnt);

        els_iocb->opcode =
            sp->type == SRB_ELS_CMD_RPT ?
            bsg_job->request->rqst_data.r_els.els_code :
            bsg_job->request->rqst_data.h_els.command_code;
        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;
        els_iocb->control_flags = 0;
        els_iocb->rx_byte_count =
            cpu_to_le32(bsg_job->reply_payload.payload_len);
        els_iocb->tx_byte_count =
            cpu_to_le32(bsg_job->request_payload.payload_len);

        els_iocb->tx_address[0] = cpu_to_le32(LSD(sg_dma_address
            (bsg_job->request_payload.sg_list)));
        els_iocb->tx_address[1] = cpu_to_le32(MSD(sg_dma_address
            (bsg_job->request_payload.sg_list)));
        els_iocb->tx_len = cpu_to_le32(sg_dma_len
            (bsg_job->request_payload.sg_list));

        els_iocb->rx_address[0] = cpu_to_le32(LSD(sg_dma_address
            (bsg_job->reply_payload.sg_list)));
        els_iocb->rx_address[1] = cpu_to_le32(MSD(sg_dma_address
            (bsg_job->reply_payload.sg_list)));
        els_iocb->rx_len = cpu_to_le32(sg_dma_len
            (bsg_job->reply_payload.sg_list));
}

static void
qla2x00_ct_iocb(srb_t *sp, ms_iocb_entry_t *ct_iocb)
{
        uint16_t        avail_dsds;
        uint32_t        *cur_dsd;
        struct scatterlist *sg;
        int index;
        uint16_t tot_dsds;
        scsi_qla_host_t *vha = sp->fcport->vha;
        struct qla_hw_data *ha = vha->hw;
        struct fc_bsg_job *bsg_job = sp->u.bsg_job;
        int loop_iterartion = 0;
        int cont_iocb_prsnt = 0;
        int entry_count = 1;

        memset(ct_iocb, 0, sizeof(ms_iocb_entry_t));
        ct_iocb->entry_type = CT_IOCB_TYPE;
        ct_iocb->entry_status = 0;
        ct_iocb->handle1 = sp->handle;
        SET_TARGET_ID(ha, ct_iocb->loop_id, sp->fcport->loop_id);
        ct_iocb->status = __constant_cpu_to_le16(0);
        ct_iocb->control_flags = __constant_cpu_to_le16(0);
        ct_iocb->timeout = 0;
        ct_iocb->cmd_dsd_count =
            __constant_cpu_to_le16(bsg_job->request_payload.sg_cnt);
        ct_iocb->total_dsd_count =
            __constant_cpu_to_le16(bsg_job->request_payload.sg_cnt + 1);
        ct_iocb->req_bytecount =
            cpu_to_le32(bsg_job->request_payload.payload_len);
        ct_iocb->rsp_bytecount =
            cpu_to_le32(bsg_job->reply_payload.payload_len);

        ct_iocb->dseg_req_address[0] = cpu_to_le32(LSD(sg_dma_address
            (bsg_job->request_payload.sg_list)));
        ct_iocb->dseg_req_address[1] = cpu_to_le32(MSD(sg_dma_address
            (bsg_job->request_payload.sg_list)));
        ct_iocb->dseg_req_length = ct_iocb->req_bytecount;

        ct_iocb->dseg_rsp_address[0] = cpu_to_le32(LSD(sg_dma_address
            (bsg_job->reply_payload.sg_list)));
        ct_iocb->dseg_rsp_address[1] = cpu_to_le32(MSD(sg_dma_address
            (bsg_job->reply_payload.sg_list)));
        ct_iocb->dseg_rsp_length = ct_iocb->rsp_bytecount;

        avail_dsds = 1;
        cur_dsd = (uint32_t *)ct_iocb->dseg_rsp_address;
        index = 0;
        tot_dsds = bsg_job->reply_payload.sg_cnt;

        for_each_sg(bsg_job->reply_payload.sg_list, sg, tot_dsds, index) {
                dma_addr_t       sle_dma;
                cont_a64_entry_t *cont_pkt;

                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        /*
                        * Five DSDs are available in the Cont.
                        * Type 1 IOCB.
                               */
                        cont_pkt = qla2x00_prep_cont_type1_iocb(vha,
                            vha->hw->req_q_map[0]);
                        cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
                        avail_dsds = 5;
                        cont_iocb_prsnt = 1;
                        entry_count++;
                }

                sle_dma = sg_dma_address(sg);
                *cur_dsd++   = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++   = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
                loop_iterartion++;
                avail_dsds--;
        }
        ct_iocb->entry_count = entry_count;
}

static void
qla24xx_ct_iocb(srb_t *sp, struct ct_entry_24xx *ct_iocb)
{
        uint16_t        avail_dsds;
        uint32_t        *cur_dsd;
        struct scatterlist *sg;
        int index;
        uint16_t tot_dsds;
        scsi_qla_host_t *vha = sp->fcport->vha;
        struct qla_hw_data *ha = vha->hw;
        struct fc_bsg_job *bsg_job = sp->u.bsg_job;
        int loop_iterartion = 0;
        int cont_iocb_prsnt = 0;
        int entry_count = 1;

        ct_iocb->entry_type = CT_IOCB_TYPE;
        ct_iocb->entry_status = 0;
        ct_iocb->sys_define = 0;
        ct_iocb->handle = sp->handle;

        ct_iocb->nport_handle = cpu_to_le16(sp->fcport->loop_id);
        ct_iocb->vp_index = sp->fcport->vp_idx;
        ct_iocb->comp_status = __constant_cpu_to_le16(0);

        ct_iocb->cmd_dsd_count =
            __constant_cpu_to_le16(bsg_job->request_payload.sg_cnt);
        ct_iocb->timeout = 0;
        ct_iocb->rsp_dsd_count =
            __constant_cpu_to_le16(bsg_job->reply_payload.sg_cnt);
        ct_iocb->rsp_byte_count =
            cpu_to_le32(bsg_job->reply_payload.payload_len);
        ct_iocb->cmd_byte_count =
            cpu_to_le32(bsg_job->request_payload.payload_len);
        ct_iocb->dseg_0_address[0] = cpu_to_le32(LSD(sg_dma_address
            (bsg_job->request_payload.sg_list)));
        ct_iocb->dseg_0_address[1] = cpu_to_le32(MSD(sg_dma_address
           (bsg_job->request_payload.sg_list)));
        ct_iocb->dseg_0_len = cpu_to_le32(sg_dma_len
            (bsg_job->request_payload.sg_list));

        avail_dsds = 1;
        cur_dsd = (uint32_t *)ct_iocb->dseg_1_address;
        index = 0;
        tot_dsds = bsg_job->reply_payload.sg_cnt;

        for_each_sg(bsg_job->reply_payload.sg_list, sg, tot_dsds, index) {
                dma_addr_t       sle_dma;
                cont_a64_entry_t *cont_pkt;

                /* Allocate additional continuation packets? */
                if (avail_dsds == 0) {
                        /*
                        * Five DSDs are available in the Cont.
                        * Type 1 IOCB.
                               */
                        cont_pkt = qla2x00_prep_cont_type1_iocb(vha,
                            ha->req_q_map[0]);
                        cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
                        avail_dsds = 5;
                        cont_iocb_prsnt = 1;
                        entry_count++;
                }

                sle_dma = sg_dma_address(sg);
                *cur_dsd++   = cpu_to_le32(LSD(sle_dma));
                *cur_dsd++   = cpu_to_le32(MSD(sle_dma));
                *cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
                loop_iterartion++;
                avail_dsds--;
        }
        ct_iocb->entry_count = entry_count;
}

/*
 * qla82xx_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
qla82xx_start_scsi(srb_t *sp)
{
        int             ret, nseg;
        unsigned long   flags;
        struct scsi_cmnd *cmd;
        uint32_t        *clr_ptr;
        uint32_t        index;
        uint32_t        handle;
        uint16_t        cnt;
        uint16_t        req_cnt;
        uint16_t        tot_dsds;
        struct device_reg_82xx __iomem *reg;
        uint32_t dbval;
        uint32_t *fcp_dl;
        uint8_t additional_cdb_len;
        struct ct6_dsd *ctx;
        struct scsi_qla_host *vha = sp->fcport->vha;
        struct qla_hw_data *ha = vha->hw;
        struct req_que *req = NULL;
        struct rsp_que *rsp = NULL;
        char tag[2];

        /* Setup device pointers. */
        ret = 0;
        reg = &ha->iobase->isp82;
        cmd = GET_CMD_SP(sp);
        req = vha->req;
        rsp = ha->rsp_q_map[0];

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

        dbval = 0x04 | (ha->portnum << 5);

        /* Send marker if required */
        if (vha->marker_needed != 0) {
                if (qla2x00_marker(vha, req,
                        rsp, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
                        ql_log(ql_log_warn, vha, 0x300c,
                            "qla2x00_marker failed for cmd=%p.\n", cmd);
                        return QLA_FUNCTION_FAILED;
                }
                vha->marker_needed = 0;
        }

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

        /* Check for room in outstanding command list. */
        handle = req->current_outstanding_cmd;
        for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
                handle++;
                if (handle == MAX_OUTSTANDING_COMMANDS)
                        handle = 1;
                if (!req->outstanding_cmds[handle])
                        break;
        }
        if (index == MAX_OUTSTANDING_COMMANDS)
                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;

        if (tot_dsds > ql2xshiftctondsd) {
                struct cmd_type_6 *cmd_pkt;
                uint16_t more_dsd_lists = 0;
                struct dsd_dma *dsd_ptr;
                uint16_t i;

                more_dsd_lists = qla24xx_calc_dsd_lists(tot_dsds);
                if ((more_dsd_lists + ha->gbl_dsd_inuse) >= NUM_DSD_CHAIN) {
                        ql_dbg(ql_dbg_io, vha, 0x300d,
                            "Num of DSD list %d is than %d for cmd=%p.\n",
                            more_dsd_lists + ha->gbl_dsd_inuse, NUM_DSD_CHAIN,
                            cmd);
                        goto queuing_error;
                }

                if (more_dsd_lists <= ha->gbl_dsd_avail)
                        goto sufficient_dsds;
                else
                        more_dsd_lists -= ha->gbl_dsd_avail;

                for (i = 0; i < more_dsd_lists; i++) {
                        dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
                        if (!dsd_ptr) {
                                ql_log(ql_log_fatal, vha, 0x300e,
                                    "Failed to allocate memory for dsd_dma "
                                    "for cmd=%p.\n", cmd);
                                goto queuing_error;
                        }

                        dsd_ptr->dsd_addr = dma_pool_alloc(ha->dl_dma_pool,
                                GFP_ATOMIC, &dsd_ptr->dsd_list_dma);
                        if (!dsd_ptr->dsd_addr) {
                                kfree(dsd_ptr);
                                ql_log(ql_log_fatal, vha, 0x300f,
                                    "Failed to allocate memory for dsd_addr "
                                    "for cmd=%p.\n", cmd);
                                goto queuing_error;
                        }
                        list_add_tail(&dsd_ptr->list, &ha->gbl_dsd_list);
                        ha->gbl_dsd_avail++;
                }

sufficient_dsds:
                req_cnt = 1;

                if (req->cnt < (req_cnt + 2)) {
                        cnt = (uint16_t)RD_REG_DWORD_RELAXED(
                                &reg->req_q_out[0]);
                        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;

                ctx = sp->u.scmd.ctx =
                    mempool_alloc(ha->ctx_mempool, GFP_ATOMIC);
                if (!ctx) {
                        ql_log(ql_log_fatal, vha, 0x3010,
                            "Failed to allocate ctx for cmd=%p.\n", cmd);
                        goto queuing_error;
                }

                memset(ctx, 0, sizeof(struct ct6_dsd));
                ctx->fcp_cmnd = dma_pool_alloc(ha->fcp_cmnd_dma_pool,
                        GFP_ATOMIC, &ctx->fcp_cmnd_dma);
                if (!ctx->fcp_cmnd) {
                        ql_log(ql_log_fatal, vha, 0x3011,
                            "Failed to allocate fcp_cmnd for cmd=%p.\n", cmd);
                        goto queuing_error_fcp_cmnd;
                }

                /* Initialize the DSD list and dma handle */
                INIT_LIST_HEAD(&ctx->dsd_list);
                ctx->dsd_use_cnt = 0;

                if (cmd->cmd_len > 16) {
                        additional_cdb_len = cmd->cmd_len - 16;
                        if ((cmd->cmd_len % 4) != 0) {
                                /* SCSI command bigger than 16 bytes must be
                                 * multiple of 4
                                 */
                                ql_log(ql_log_warn, vha, 0x3012,
                                    "scsi cmd len %d not multiple of 4 "
                                    "for cmd=%p.\n", cmd->cmd_len, cmd);
                                goto queuing_error_fcp_cmnd;
                        }
                        ctx->fcp_cmnd_len = 12 + cmd->cmd_len + 4;
                } else {
                        additional_cdb_len = 0;
                        ctx->fcp_cmnd_len = 12 + 16 + 4;
                }

                cmd_pkt = (struct cmd_type_6 *)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->vp_idx;

                /* Build IOCB segments */
                if (qla24xx_build_scsi_type_6_iocbs(sp, cmd_pkt, tot_dsds))
                        goto queuing_error_fcp_cmnd;

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

                /* build FCP_CMND IU */
                memset(ctx->fcp_cmnd, 0, sizeof(struct fcp_cmnd));
                int_to_scsilun(cmd->device->lun, &ctx->fcp_cmnd->lun);
                ctx->fcp_cmnd->additional_cdb_len = additional_cdb_len;

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

                /*
                 * Update tagged queuing modifier -- default is TSK_SIMPLE (0).
                 */
                if (scsi_populate_tag_msg(cmd, tag)) {
                        switch (tag[0]) {
                        case HEAD_OF_QUEUE_TAG:
                                ctx->fcp_cmnd->task_attribute =
                                    TSK_HEAD_OF_QUEUE;
                                break;
                        case ORDERED_QUEUE_TAG:
                                ctx->fcp_cmnd->task_attribute =
                                    TSK_ORDERED;
                                break;
                        }
                }

                /* Populate the FCP_PRIO. */
                if (ha->flags.fcp_prio_enabled)
                        ctx->fcp_cmnd->task_attribute |=
                            sp->fcport->fcp_prio << 3;

                memcpy(ctx->fcp_cmnd->cdb, cmd->cmnd, cmd->cmd_len);

                fcp_dl = (uint32_t *)(ctx->fcp_cmnd->cdb + 16 +
                    additional_cdb_len);
                *fcp_dl = htonl((uint32_t)scsi_bufflen(cmd));

                cmd_pkt->fcp_cmnd_dseg_len = cpu_to_le16(ctx->fcp_cmnd_len);
                cmd_pkt->fcp_cmnd_dseg_address[0] =
                    cpu_to_le32(LSD(ctx->fcp_cmnd_dma));
                cmd_pkt->fcp_cmnd_dseg_address[1] =
                    cpu_to_le32(MSD(ctx->fcp_cmnd_dma));

                sp->flags |= SRB_FCP_CMND_DMA_VALID;
                cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
                /* Set total data segment count. */
                cmd_pkt->entry_count = (uint8_t)req_cnt;
                /* Specify response queue number where
                 * completion should happen
                 */
                cmd_pkt->entry_status = (uint8_t) rsp->id;
        } else {
                struct cmd_type_7 *cmd_pkt;
                req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
                if (req->cnt < (req_cnt + 2)) {
                        cnt = (uint16_t)RD_REG_DWORD_RELAXED(
                            &reg->req_q_out[0]);
                        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;

                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->vp_idx;

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

                /*
                 * Update tagged queuing modifier -- default is TSK_SIMPLE (0).
                 */
                if (scsi_populate_tag_msg(cmd, tag)) {
                        switch (tag[0]) {
                        case HEAD_OF_QUEUE_TAG:
                                cmd_pkt->task = TSK_HEAD_OF_QUEUE;
                                break;
                        case ORDERED_QUEUE_TAG:
                                cmd_pkt->task = TSK_ORDERED;
                                break;
                        }
                }

                /* Populate the FCP_PRIO. */
                if (ha->flags.fcp_prio_enabled)
                        cmd_pkt->task |= sp->fcport->fcp_prio << 3;

                /* 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);

                /* Set total data segment count. */
                cmd_pkt->entry_count = (uint8_t)req_cnt;
                /* Specify response queue number where
                 * completion should happen.
                 */
                cmd_pkt->entry_status = (uint8_t) rsp->id;

        }
        /* 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;
        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. */
        /* write, read and verify logic */
        dbval = dbval | (req->id << 8) | (req->ring_index << 16);
        if (ql2xdbwr)
                qla82xx_wr_32(ha, ha->nxdb_wr_ptr, dbval);
        else {
                WRT_REG_DWORD(
                        (unsigned long __iomem *)ha->nxdb_wr_ptr,
                        dbval);
                wmb();
                while (RD_REG_DWORD(ha->nxdb_rd_ptr) != dbval) {
                        WRT_REG_DWORD(
                                (unsigned long __iomem *)ha->nxdb_wr_ptr,
                                dbval);
                        wmb();
                }
        }

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

queuing_error_fcp_cmnd:
        dma_pool_free(ha->fcp_cmnd_dma_pool, ctx->fcp_cmnd, ctx->fcp_cmnd_dma);
queuing_error:
        if (tot_dsds)
                scsi_dma_unmap(cmd);

        if (sp->u.scmd.ctx) {
                mempool_free(sp->u.scmd.ctx, ha->ctx_mempool);
                sp->u.scmd.ctx = NULL;
        }
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return QLA_FUNCTION_FAILED;
}

int
qla2x00_start_sp(srb_t *sp)
{
        int rval;
        struct qla_hw_data *ha = sp->fcport->vha->hw;
        void *pkt;
        unsigned long flags;

        rval = QLA_FUNCTION_FAILED;
        spin_lock_irqsave(&ha->hardware_lock, flags);
        pkt = qla2x00_alloc_iocbs(sp->fcport->vha, sp);
        if (!pkt) {
                ql_log(ql_log_warn, sp->fcport->vha, 0x700c,
                    "qla2x00_alloc_iocbs failed.\n");
                goto done;
        }

        rval = QLA_SUCCESS;
        switch (sp->type) {
        case SRB_LOGIN_CMD:
                IS_FWI2_CAPABLE(ha) ?
                    qla24xx_login_iocb(sp, pkt) :
                    qla2x00_login_iocb(sp, pkt);
                break;
        case SRB_LOGOUT_CMD:
                IS_FWI2_CAPABLE(ha) ?
                    qla24xx_logout_iocb(sp, pkt) :
                    qla2x00_logout_iocb(sp, pkt);
                break;
        case SRB_ELS_CMD_RPT:
        case SRB_ELS_CMD_HST:
                qla24xx_els_iocb(sp, pkt);
                break;
        case SRB_CT_CMD:
                IS_FWI2_CAPABLE(ha) ?
                    qla24xx_ct_iocb(sp, pkt) :
                    qla2x00_ct_iocb(sp, pkt);
                break;
        case SRB_ADISC_CMD:
                IS_FWI2_CAPABLE(ha) ?
                    qla24xx_adisc_iocb(sp, pkt) :
                    qla2x00_adisc_iocb(sp, pkt);
                break;
        case SRB_TM_CMD:
                qla24xx_tm_iocb(sp, pkt);
                break;
        default:
                break;
        }

        wmb();
        qla2x00_start_iocbs(sp->fcport->vha, ha->req_q_map[0]);
done:
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return rval;
}