/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2020 Intel Corporation
 */

#include <unistd.h>

#include <rte_common.h>
#include <rte_log.h>
#include <rte_dev.h>
#include <rte_malloc.h>
#include <rte_mempool.h>
#include <rte_byteorder.h>
#include <rte_errno.h>
#include <rte_branch_prediction.h>
#include <rte_hexdump.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
#ifdef RTE_BBDEV_OFFLOAD_COST
#include <rte_cycles.h>
#endif

#include <rte_bbdev.h>
#include <rte_bbdev_pmd.h>
#include "rte_acc100_pmd.h"

#ifdef RTE_LIBRTE_BBDEV_DEBUG
RTE_LOG_REGISTER_DEFAULT(acc100_logtype, DEBUG);
#else
RTE_LOG_REGISTER_DEFAULT(acc100_logtype, NOTICE);
#endif

/* Write to MMIO register address */
static inline void
mmio_write(void *addr, uint32_t value)
{
        *((volatile uint32_t *)(addr)) = rte_cpu_to_le_32(value);
}

/* Write a register of a ACC100 device */
static inline void
acc100_reg_write(struct acc100_device *d, uint32_t offset, uint32_t value)
{
        void *reg_addr = RTE_PTR_ADD(d->mmio_base, offset);
        mmio_write(reg_addr, value);
        usleep(ACC100_LONG_WAIT);
}

/* Read a register of a ACC100 device */
static inline uint32_t
acc100_reg_read(struct acc100_device *d, uint32_t offset)
{

        void *reg_addr = RTE_PTR_ADD(d->mmio_base, offset);
        uint32_t ret = *((volatile uint32_t *)(reg_addr));
        return rte_le_to_cpu_32(ret);
}

/* Basic Implementation of Log2 for exact 2^N */
static inline uint32_t
log2_basic(uint32_t value)
{
        return (value == 0) ? 0 : rte_bsf32(value);
}

/* Calculate memory alignment offset assuming alignment is 2^N */
static inline uint32_t
calc_mem_alignment_offset(void *unaligned_virt_mem, uint32_t alignment)
{
        rte_iova_t unaligned_phy_mem = rte_malloc_virt2iova(unaligned_virt_mem);
        return (uint32_t)(alignment -
                        (unaligned_phy_mem & (alignment-1)));
}

/* Calculate the offset of the enqueue register */
static inline uint32_t
queue_offset(bool pf_device, uint8_t vf_id, uint8_t qgrp_id, uint16_t aq_id)
{
        if (pf_device)
                return ((vf_id << 12) + (qgrp_id << 7) + (aq_id << 3) +
                                HWPfQmgrIngressAq);
        else
                return ((qgrp_id << 7) + (aq_id << 3) +
                                HWVfQmgrIngressAq);
}

enum {UL_4G = 0, UL_5G, DL_4G, DL_5G, NUM_ACC};

/* Return the accelerator enum for a Queue Group Index */
static inline int
accFromQgid(int qg_idx, const struct rte_acc100_conf *acc100_conf)
{
        int accQg[ACC100_NUM_QGRPS];
        int NumQGroupsPerFn[NUM_ACC];
        int acc, qgIdx, qgIndex = 0;
        for (qgIdx = 0; qgIdx < ACC100_NUM_QGRPS; qgIdx++)
                accQg[qgIdx] = 0;
        NumQGroupsPerFn[UL_4G] = acc100_conf->q_ul_4g.num_qgroups;
        NumQGroupsPerFn[UL_5G] = acc100_conf->q_ul_5g.num_qgroups;
        NumQGroupsPerFn[DL_4G] = acc100_conf->q_dl_4g.num_qgroups;
        NumQGroupsPerFn[DL_5G] = acc100_conf->q_dl_5g.num_qgroups;
        for (acc = UL_4G;  acc < NUM_ACC; acc++)
                for (qgIdx = 0; qgIdx < NumQGroupsPerFn[acc]; qgIdx++)
                        accQg[qgIndex++] = acc;
        acc = accQg[qg_idx];
        return acc;
}

/* Return the queue topology for a Queue Group Index */
static inline void
qtopFromAcc(struct rte_acc100_queue_topology **qtop, int acc_enum,
                struct rte_acc100_conf *acc100_conf)
{
        struct rte_acc100_queue_topology *p_qtop;
        p_qtop = NULL;
        switch (acc_enum) {
        case UL_4G:
                p_qtop = &(acc100_conf->q_ul_4g);
                break;
        case UL_5G:
                p_qtop = &(acc100_conf->q_ul_5g);
                break;
        case DL_4G:
                p_qtop = &(acc100_conf->q_dl_4g);
                break;
        case DL_5G:
                p_qtop = &(acc100_conf->q_dl_5g);
                break;
        default:
                /* NOTREACHED */
                rte_bbdev_log(ERR, "Unexpected error evaluating qtopFromAcc");
                break;
        }
        *qtop = p_qtop;
}

/* Return the AQ depth for a Queue Group Index */
static inline int
aqDepth(int qg_idx, struct rte_acc100_conf *acc100_conf)
{
        struct rte_acc100_queue_topology *q_top = NULL;
        int acc_enum = accFromQgid(qg_idx, acc100_conf);
        qtopFromAcc(&q_top, acc_enum, acc100_conf);
        if (unlikely(q_top == NULL))
                return 0;
        return q_top->aq_depth_log2;
}

/* Return the AQ depth for a Queue Group Index */
static inline int
aqNum(int qg_idx, struct rte_acc100_conf *acc100_conf)
{
        struct rte_acc100_queue_topology *q_top = NULL;
        int acc_enum = accFromQgid(qg_idx, acc100_conf);
        qtopFromAcc(&q_top, acc_enum, acc100_conf);
        if (unlikely(q_top == NULL))
                return 0;
        return q_top->num_aqs_per_groups;
}

static void
initQTop(struct rte_acc100_conf *acc100_conf)
{
        acc100_conf->q_ul_4g.num_aqs_per_groups = 0;
        acc100_conf->q_ul_4g.num_qgroups = 0;
        acc100_conf->q_ul_4g.first_qgroup_index = -1;
        acc100_conf->q_ul_5g.num_aqs_per_groups = 0;
        acc100_conf->q_ul_5g.num_qgroups = 0;
        acc100_conf->q_ul_5g.first_qgroup_index = -1;
        acc100_conf->q_dl_4g.num_aqs_per_groups = 0;
        acc100_conf->q_dl_4g.num_qgroups = 0;
        acc100_conf->q_dl_4g.first_qgroup_index = -1;
        acc100_conf->q_dl_5g.num_aqs_per_groups = 0;
        acc100_conf->q_dl_5g.num_qgroups = 0;
        acc100_conf->q_dl_5g.first_qgroup_index = -1;
}

static inline void
updateQtop(uint8_t acc, uint8_t qg, struct rte_acc100_conf *acc100_conf,
                struct acc100_device *d) {
        uint32_t reg;
        struct rte_acc100_queue_topology *q_top = NULL;
        qtopFromAcc(&q_top, acc, acc100_conf);
        if (unlikely(q_top == NULL))
                return;
        uint16_t aq;
        q_top->num_qgroups++;
        if (q_top->first_qgroup_index == -1) {
                q_top->first_qgroup_index = qg;
                /* Can be optimized to assume all are enabled by default */
                reg = acc100_reg_read(d, queue_offset(d->pf_device,
                                0, qg, ACC100_NUM_AQS - 1));
                if (reg & ACC100_QUEUE_ENABLE) {
                        q_top->num_aqs_per_groups = ACC100_NUM_AQS;
                        return;
                }
                q_top->num_aqs_per_groups = 0;
                for (aq = 0; aq < ACC100_NUM_AQS; aq++) {
                        reg = acc100_reg_read(d, queue_offset(d->pf_device,
                                        0, qg, aq));
                        if (reg & ACC100_QUEUE_ENABLE)
                                q_top->num_aqs_per_groups++;
                }
        }
}

/* Fetch configuration enabled for the PF/VF using MMIO Read (slow) */
static inline void
fetch_acc100_config(struct rte_bbdev *dev)
{
        struct acc100_device *d = dev->data->dev_private;
        struct rte_acc100_conf *acc100_conf = &d->acc100_conf;
        const struct acc100_registry_addr *reg_addr;
        uint8_t acc, qg;
        uint32_t reg, reg_aq, reg_len0, reg_len1;
        uint32_t reg_mode;

        /* No need to retrieve the configuration is already done */
        if (d->configured)
                return;

        /* Choose correct registry addresses for the device type */
        if (d->pf_device)
                reg_addr = &pf_reg_addr;
        else
                reg_addr = &vf_reg_addr;

        d->ddr_size = (1 + acc100_reg_read(d, reg_addr->ddr_range)) << 10;

        /* Single VF Bundle by VF */
        acc100_conf->num_vf_bundles = 1;
        initQTop(acc100_conf);

        struct rte_acc100_queue_topology *q_top = NULL;
        int qman_func_id[ACC100_NUM_ACCS] = {ACC100_ACCMAP_0, ACC100_ACCMAP_1,
                        ACC100_ACCMAP_2, ACC100_ACCMAP_3, ACC100_ACCMAP_4};
        reg = acc100_reg_read(d, reg_addr->qman_group_func);
        for (qg = 0; qg < ACC100_NUM_QGRPS_PER_WORD; qg++) {
                reg_aq = acc100_reg_read(d,
                                queue_offset(d->pf_device, 0, qg, 0));
                if (reg_aq & ACC100_QUEUE_ENABLE) {
                        uint32_t idx = (reg >> (qg * 4)) & 0x7;
                        if (idx < ACC100_NUM_ACCS) {
                                acc = qman_func_id[idx];
                                updateQtop(acc, qg, acc100_conf, d);
                        }
                }
        }

        /* Check the depth of the AQs*/
        reg_len0 = acc100_reg_read(d, reg_addr->depth_log0_offset);
        reg_len1 = acc100_reg_read(d, reg_addr->depth_log1_offset);
        for (acc = 0; acc < NUM_ACC; acc++) {
                qtopFromAcc(&q_top, acc, acc100_conf);
                if (q_top->first_qgroup_index < ACC100_NUM_QGRPS_PER_WORD)
                        q_top->aq_depth_log2 = (reg_len0 >>
                                        (q_top->first_qgroup_index * 4))
                                        & 0xF;
                else
                        q_top->aq_depth_log2 = (reg_len1 >>
                                        ((q_top->first_qgroup_index -
                                        ACC100_NUM_QGRPS_PER_WORD) * 4))
                                        & 0xF;
        }

        /* Read PF mode */
        if (d->pf_device) {
                reg_mode = acc100_reg_read(d, HWPfHiPfMode);
                acc100_conf->pf_mode_en = (reg_mode == ACC100_PF_VAL) ? 1 : 0;
        }

        rte_bbdev_log_debug(
                        "%s Config LLR SIGN IN/OUT %s %s QG %u %u %u %u AQ %u %u %u %u Len %u %u %u %u\n",
                        (d->pf_device) ? "PF" : "VF",
                        (acc100_conf->input_pos_llr_1_bit) ? "POS" : "NEG",
                        (acc100_conf->output_pos_llr_1_bit) ? "POS" : "NEG",
                        acc100_conf->q_ul_4g.num_qgroups,
                        acc100_conf->q_dl_4g.num_qgroups,
                        acc100_conf->q_ul_5g.num_qgroups,
                        acc100_conf->q_dl_5g.num_qgroups,
                        acc100_conf->q_ul_4g.num_aqs_per_groups,
                        acc100_conf->q_dl_4g.num_aqs_per_groups,
                        acc100_conf->q_ul_5g.num_aqs_per_groups,
                        acc100_conf->q_dl_5g.num_aqs_per_groups,
                        acc100_conf->q_ul_4g.aq_depth_log2,
                        acc100_conf->q_dl_4g.aq_depth_log2,
                        acc100_conf->q_ul_5g.aq_depth_log2,
                        acc100_conf->q_dl_5g.aq_depth_log2);
}

static void
free_base_addresses(void **base_addrs, int size)
{
        int i;
        for (i = 0; i < size; i++)
                rte_free(base_addrs[i]);
}

static inline uint32_t
get_desc_len(void)
{
        return sizeof(union acc100_dma_desc);
}

/* Allocate the 2 * 64MB block for the sw rings */
static int
alloc_2x64mb_sw_rings_mem(struct rte_bbdev *dev, struct acc100_device *d,
                int socket)
{
        uint32_t sw_ring_size = ACC100_SIZE_64MBYTE;
        d->sw_rings_base = rte_zmalloc_socket(dev->device->driver->name,
                        2 * sw_ring_size, RTE_CACHE_LINE_SIZE, socket);
        if (d->sw_rings_base == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate memory for %s:%u",
                                dev->device->driver->name,
                                dev->data->dev_id);
                return -ENOMEM;
        }
        uint32_t next_64mb_align_offset = calc_mem_alignment_offset(
                        d->sw_rings_base, ACC100_SIZE_64MBYTE);
        d->sw_rings = RTE_PTR_ADD(d->sw_rings_base, next_64mb_align_offset);
        d->sw_rings_iova = rte_malloc_virt2iova(d->sw_rings_base) +
                        next_64mb_align_offset;
        d->sw_ring_size = ACC100_MAX_QUEUE_DEPTH * get_desc_len();
        d->sw_ring_max_depth = ACC100_MAX_QUEUE_DEPTH;

        return 0;
}

/* Attempt to allocate minimised memory space for sw rings */
static void
alloc_sw_rings_min_mem(struct rte_bbdev *dev, struct acc100_device *d,
                uint16_t num_queues, int socket)
{
        rte_iova_t sw_rings_base_iova, next_64mb_align_addr_iova;
        uint32_t next_64mb_align_offset;
        rte_iova_t sw_ring_iova_end_addr;
        void *base_addrs[ACC100_SW_RING_MEM_ALLOC_ATTEMPTS];
        void *sw_rings_base;
        int i = 0;
        uint32_t q_sw_ring_size = ACC100_MAX_QUEUE_DEPTH * get_desc_len();
        uint32_t dev_sw_ring_size = q_sw_ring_size * num_queues;

        /* Find an aligned block of memory to store sw rings */
        while (i < ACC100_SW_RING_MEM_ALLOC_ATTEMPTS) {
                /*
                 * sw_ring allocated memory is guaranteed to be aligned to
                 * q_sw_ring_size at the condition that the requested size is
                 * less than the page size
                 */
                sw_rings_base = rte_zmalloc_socket(
                                dev->device->driver->name,
                                dev_sw_ring_size, q_sw_ring_size, socket);

                if (sw_rings_base == NULL) {
                        rte_bbdev_log(ERR,
                                        "Failed to allocate memory for %s:%u",
                                        dev->device->driver->name,
                                        dev->data->dev_id);
                        break;
                }

                sw_rings_base_iova = rte_malloc_virt2iova(sw_rings_base);
                next_64mb_align_offset = calc_mem_alignment_offset(
                                sw_rings_base, ACC100_SIZE_64MBYTE);
                next_64mb_align_addr_iova = sw_rings_base_iova +
                                next_64mb_align_offset;
                sw_ring_iova_end_addr = sw_rings_base_iova + dev_sw_ring_size;

                /* Check if the end of the sw ring memory block is before the
                 * start of next 64MB aligned mem address
                 */
                if (sw_ring_iova_end_addr < next_64mb_align_addr_iova) {
                        d->sw_rings_iova = sw_rings_base_iova;
                        d->sw_rings = sw_rings_base;
                        d->sw_rings_base = sw_rings_base;
                        d->sw_ring_size = q_sw_ring_size;
                        d->sw_ring_max_depth = ACC100_MAX_QUEUE_DEPTH;
                        break;
                }
                /* Store the address of the unaligned mem block */
                base_addrs[i] = sw_rings_base;
                i++;
        }

        /* Free all unaligned blocks of mem allocated in the loop */
        free_base_addresses(base_addrs, i);
}

/*
 * Find queue_id of a device queue based on details from the Info Ring.
 * If a queue isn't found UINT16_MAX is returned.
 */
static inline uint16_t
get_queue_id_from_ring_info(struct rte_bbdev_data *data,
                const union acc100_info_ring_data ring_data)
{
        uint16_t queue_id;

        for (queue_id = 0; queue_id < data->num_queues; ++queue_id) {
                struct acc100_queue *acc100_q =
                                data->queues[queue_id].queue_private;
                if (acc100_q != NULL && acc100_q->aq_id == ring_data.aq_id &&
                                acc100_q->qgrp_id == ring_data.qg_id &&
                                acc100_q->vf_id == ring_data.vf_id)
                        return queue_id;
        }

        return UINT16_MAX;
}

/* Checks PF Info Ring to find the interrupt cause and handles it accordingly */
static inline void
acc100_check_ir(struct acc100_device *acc100_dev)
{
        volatile union acc100_info_ring_data *ring_data;
        uint16_t info_ring_head = acc100_dev->info_ring_head;
        if (acc100_dev->info_ring == NULL)
                return;

        ring_data = acc100_dev->info_ring + (acc100_dev->info_ring_head &
                        ACC100_INFO_RING_MASK);

        while (ring_data->valid) {
                if ((ring_data->int_nb < ACC100_PF_INT_DMA_DL_DESC_IRQ) || (
                                ring_data->int_nb >
                                ACC100_PF_INT_DMA_DL5G_DESC_IRQ))
                        rte_bbdev_log(WARNING, "InfoRing: ITR:%d Info:0x%x",
                                ring_data->int_nb, ring_data->detailed_info);
                /* Initialize Info Ring entry and move forward */
                ring_data->val = 0;
                info_ring_head++;
                ring_data = acc100_dev->info_ring +
                                (info_ring_head & ACC100_INFO_RING_MASK);
        }
}

/* Checks PF Info Ring to find the interrupt cause and handles it accordingly */
static inline void
acc100_pf_interrupt_handler(struct rte_bbdev *dev)
{
        struct acc100_device *acc100_dev = dev->data->dev_private;
        volatile union acc100_info_ring_data *ring_data;
        struct acc100_deq_intr_details deq_intr_det;

        ring_data = acc100_dev->info_ring + (acc100_dev->info_ring_head &
                        ACC100_INFO_RING_MASK);

        while (ring_data->valid) {

                rte_bbdev_log_debug(
                                "ACC100 PF Interrupt received, Info Ring data: 0x%x",
                                ring_data->val);

                switch (ring_data->int_nb) {
                case ACC100_PF_INT_DMA_DL_DESC_IRQ:
                case ACC100_PF_INT_DMA_UL_DESC_IRQ:
                case ACC100_PF_INT_DMA_UL5G_DESC_IRQ:
                case ACC100_PF_INT_DMA_DL5G_DESC_IRQ:
                        deq_intr_det.queue_id = get_queue_id_from_ring_info(
                                        dev->data, *ring_data);
                        if (deq_intr_det.queue_id == UINT16_MAX) {
                                rte_bbdev_log(ERR,
                                                "Couldn't find queue: aq_id: %u, qg_id: %u, vf_id: %u",
                                                ring_data->aq_id,
                                                ring_data->qg_id,
                                                ring_data->vf_id);
                                return;
                        }
                        rte_bbdev_pmd_callback_process(dev,
                                        RTE_BBDEV_EVENT_DEQUEUE, &deq_intr_det);
                        break;
                default:
                        rte_bbdev_pmd_callback_process(dev,
                                        RTE_BBDEV_EVENT_ERROR, NULL);
                        break;
                }

                /* Initialize Info Ring entry and move forward */
                ring_data->val = 0;
                ++acc100_dev->info_ring_head;
                ring_data = acc100_dev->info_ring +
                                (acc100_dev->info_ring_head &
                                ACC100_INFO_RING_MASK);
        }
}

/* Checks VF Info Ring to find the interrupt cause and handles it accordingly */
static inline void
acc100_vf_interrupt_handler(struct rte_bbdev *dev)
{
        struct acc100_device *acc100_dev = dev->data->dev_private;
        volatile union acc100_info_ring_data *ring_data;
        struct acc100_deq_intr_details deq_intr_det;

        ring_data = acc100_dev->info_ring + (acc100_dev->info_ring_head &
                        ACC100_INFO_RING_MASK);

        while (ring_data->valid) {

                rte_bbdev_log_debug(
                                "ACC100 VF Interrupt received, Info Ring data: 0x%x",
                                ring_data->val);

                switch (ring_data->int_nb) {
                case ACC100_VF_INT_DMA_DL_DESC_IRQ:
                case ACC100_VF_INT_DMA_UL_DESC_IRQ:
                case ACC100_VF_INT_DMA_UL5G_DESC_IRQ:
                case ACC100_VF_INT_DMA_DL5G_DESC_IRQ:
                        /* VFs are not aware of their vf_id - it's set to 0 in
                         * queue structures.
                         */
                        ring_data->vf_id = 0;
                        deq_intr_det.queue_id = get_queue_id_from_ring_info(
                                        dev->data, *ring_data);
                        if (deq_intr_det.queue_id == UINT16_MAX) {
                                rte_bbdev_log(ERR,
                                                "Couldn't find queue: aq_id: %u, qg_id: %u",
                                                ring_data->aq_id,
                                                ring_data->qg_id);
                                return;
                        }
                        rte_bbdev_pmd_callback_process(dev,
                                        RTE_BBDEV_EVENT_DEQUEUE, &deq_intr_det);
                        break;
                default:
                        rte_bbdev_pmd_callback_process(dev,
                                        RTE_BBDEV_EVENT_ERROR, NULL);
                        break;
                }

                /* Initialize Info Ring entry and move forward */
                ring_data->valid = 0;
                ++acc100_dev->info_ring_head;
                ring_data = acc100_dev->info_ring + (acc100_dev->info_ring_head
                                & ACC100_INFO_RING_MASK);
        }
}

/* Interrupt handler triggered by ACC100 dev for handling specific interrupt */
static void
acc100_dev_interrupt_handler(void *cb_arg)
{
        struct rte_bbdev *dev = cb_arg;
        struct acc100_device *acc100_dev = dev->data->dev_private;

        /* Read info ring */
        if (acc100_dev->pf_device)
                acc100_pf_interrupt_handler(dev);
        else
                acc100_vf_interrupt_handler(dev);
}

/* Allocate and setup inforing */
static int
allocate_info_ring(struct rte_bbdev *dev)
{
        struct acc100_device *d = dev->data->dev_private;
        const struct acc100_registry_addr *reg_addr;
        rte_iova_t info_ring_iova;
        uint32_t phys_low, phys_high;

        if (d->info_ring != NULL)
                return 0; /* Already configured */

        /* Choose correct registry addresses for the device type */
        if (d->pf_device)
                reg_addr = &pf_reg_addr;
        else
                reg_addr = &vf_reg_addr;
        /* Allocate InfoRing */
        d->info_ring = rte_zmalloc_socket("Info Ring",
                        ACC100_INFO_RING_NUM_ENTRIES *
                        sizeof(*d->info_ring), RTE_CACHE_LINE_SIZE,
                        dev->data->socket_id);
        if (d->info_ring == NULL) {
                rte_bbdev_log(ERR,
                                "Failed to allocate Info Ring for %s:%u",
                                dev->device->driver->name,
                                dev->data->dev_id);
                return -ENOMEM;
        }
        info_ring_iova = rte_malloc_virt2iova(d->info_ring);

        /* Setup Info Ring */
        phys_high = (uint32_t)(info_ring_iova >> 32);
        phys_low  = (uint32_t)(info_ring_iova);
        acc100_reg_write(d, reg_addr->info_ring_hi, phys_high);
        acc100_reg_write(d, reg_addr->info_ring_lo, phys_low);
        acc100_reg_write(d, reg_addr->info_ring_en, ACC100_REG_IRQ_EN_ALL);
        d->info_ring_head = (acc100_reg_read(d, reg_addr->info_ring_ptr) &
                        0xFFF) / sizeof(union acc100_info_ring_data);
        return 0;
}


/* Allocate 64MB memory used for all software rings */
static int
acc100_setup_queues(struct rte_bbdev *dev, uint16_t num_queues, int socket_id)
{
        uint32_t phys_low, phys_high, value;
        struct acc100_device *d = dev->data->dev_private;
        const struct acc100_registry_addr *reg_addr;
        int ret;

        if (d->pf_device && !d->acc100_conf.pf_mode_en) {
                rte_bbdev_log(NOTICE,
                                "%s has PF mode disabled. This PF can't be used.",
                                dev->data->name);
                return -ENODEV;
        }

        alloc_sw_rings_min_mem(dev, d, num_queues, socket_id);

        /* If minimal memory space approach failed, then allocate
         * the 2 * 64MB block for the sw rings
         */
        if (d->sw_rings == NULL)
                alloc_2x64mb_sw_rings_mem(dev, d, socket_id);

        if (d->sw_rings == NULL) {
                rte_bbdev_log(NOTICE,
                                "Failure allocating sw_rings memory");
                return -ENODEV;
        }

        /* Configure ACC100 with the base address for DMA descriptor rings
         * Same descriptor rings used for UL and DL DMA Engines
         * Note : Assuming only VF0 bundle is used for PF mode
         */
        phys_high = (uint32_t)(d->sw_rings_iova >> 32);
        phys_low  = (uint32_t)(d->sw_rings_iova & ~(ACC100_SIZE_64MBYTE-1));

        /* Choose correct registry addresses for the device type */
        if (d->pf_device)
                reg_addr = &pf_reg_addr;
        else
                reg_addr = &vf_reg_addr;

        /* Read the populated cfg from ACC100 registers */
        fetch_acc100_config(dev);

        /* Release AXI from PF */
        if (d->pf_device)
                acc100_reg_write(d, HWPfDmaAxiControl, 1);

        acc100_reg_write(d, reg_addr->dma_ring_ul5g_hi, phys_high);
        acc100_reg_write(d, reg_addr->dma_ring_ul5g_lo, phys_low);
        acc100_reg_write(d, reg_addr->dma_ring_dl5g_hi, phys_high);
        acc100_reg_write(d, reg_addr->dma_ring_dl5g_lo, phys_low);
        acc100_reg_write(d, reg_addr->dma_ring_ul4g_hi, phys_high);
        acc100_reg_write(d, reg_addr->dma_ring_ul4g_lo, phys_low);
        acc100_reg_write(d, reg_addr->dma_ring_dl4g_hi, phys_high);
        acc100_reg_write(d, reg_addr->dma_ring_dl4g_lo, phys_low);

        /*
         * Configure Ring Size to the max queue ring size
         * (used for wrapping purpose)
         */
        value = log2_basic(d->sw_ring_size / 64);
        acc100_reg_write(d, reg_addr->ring_size, value);

        /* Configure tail pointer for use when SDONE enabled */
        d->tail_ptrs = rte_zmalloc_socket(
                        dev->device->driver->name,
                        ACC100_NUM_QGRPS * ACC100_NUM_AQS * sizeof(uint32_t),
                        RTE_CACHE_LINE_SIZE, socket_id);
        if (d->tail_ptrs == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate tail ptr for %s:%u",
                                dev->device->driver->name,
                                dev->data->dev_id);
                rte_free(d->sw_rings);
                return -ENOMEM;
        }
        d->tail_ptr_iova = rte_malloc_virt2iova(d->tail_ptrs);

        phys_high = (uint32_t)(d->tail_ptr_iova >> 32);
        phys_low  = (uint32_t)(d->tail_ptr_iova);
        acc100_reg_write(d, reg_addr->tail_ptrs_ul5g_hi, phys_high);
        acc100_reg_write(d, reg_addr->tail_ptrs_ul5g_lo, phys_low);
        acc100_reg_write(d, reg_addr->tail_ptrs_dl5g_hi, phys_high);
        acc100_reg_write(d, reg_addr->tail_ptrs_dl5g_lo, phys_low);
        acc100_reg_write(d, reg_addr->tail_ptrs_ul4g_hi, phys_high);
        acc100_reg_write(d, reg_addr->tail_ptrs_ul4g_lo, phys_low);
        acc100_reg_write(d, reg_addr->tail_ptrs_dl4g_hi, phys_high);
        acc100_reg_write(d, reg_addr->tail_ptrs_dl4g_lo, phys_low);

        ret = allocate_info_ring(dev);
        if (ret < 0) {
                rte_bbdev_log(ERR, "Failed to allocate info_ring for %s:%u",
                                dev->device->driver->name,
                                dev->data->dev_id);
                /* Continue */
        }

        d->harq_layout = rte_zmalloc_socket("HARQ Layout",
                        ACC100_HARQ_LAYOUT * sizeof(*d->harq_layout),
                        RTE_CACHE_LINE_SIZE, dev->data->socket_id);
        if (d->harq_layout == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate harq_layout for %s:%u",
                                dev->device->driver->name,
                                dev->data->dev_id);
                rte_free(d->sw_rings);
                return -ENOMEM;
        }

        /* Mark as configured properly */
        d->configured = true;

        rte_bbdev_log_debug(
                        "ACC100 (%s) configured  sw_rings = %p, sw_rings_iova = %#"
                        PRIx64, dev->data->name, d->sw_rings, d->sw_rings_iova);

        return 0;
}

static int
acc100_intr_enable(struct rte_bbdev *dev)
{
        int ret;
        struct acc100_device *d = dev->data->dev_private;

        /* Only MSI are currently supported */
        if (rte_intr_type_get(dev->intr_handle) == RTE_INTR_HANDLE_VFIO_MSI ||
                        rte_intr_type_get(dev->intr_handle) == RTE_INTR_HANDLE_UIO) {

                ret = allocate_info_ring(dev);
                if (ret < 0) {
                        rte_bbdev_log(ERR,
                                        "Couldn't allocate info ring for device: %s",
                                        dev->data->name);
                        return ret;
                }

                ret = rte_intr_enable(dev->intr_handle);
                if (ret < 0) {
                        rte_bbdev_log(ERR,
                                        "Couldn't enable interrupts for device: %s",
                                        dev->data->name);
                        rte_free(d->info_ring);
                        return ret;
                }
                ret = rte_intr_callback_register(dev->intr_handle,
                                acc100_dev_interrupt_handler, dev);
                if (ret < 0) {
                        rte_bbdev_log(ERR,
                                        "Couldn't register interrupt callback for device: %s",
                                        dev->data->name);
                        rte_free(d->info_ring);
                        return ret;
                }

                return 0;
        }

        rte_bbdev_log(ERR, "ACC100 (%s) supports only VFIO MSI interrupts",
                        dev->data->name);
        return -ENOTSUP;
}

/* Free memory used for software rings */
static int
acc100_dev_close(struct rte_bbdev *dev)
{
        struct acc100_device *d = dev->data->dev_private;
        acc100_check_ir(d);
        if (d->sw_rings_base != NULL) {
                rte_free(d->tail_ptrs);
                rte_free(d->info_ring);
                rte_free(d->sw_rings_base);
                d->sw_rings_base = NULL;
        }
        /* Ensure all in flight HW transactions are completed */
        usleep(ACC100_LONG_WAIT);
        return 0;
}

/**
 * Report a ACC100 queue index which is free
 * Return 0 to 16k for a valid queue_idx or -1 when no queue is available
 * Note : Only supporting VF0 Bundle for PF mode
 */
static int
acc100_find_free_queue_idx(struct rte_bbdev *dev,
                const struct rte_bbdev_queue_conf *conf)
{
        struct acc100_device *d = dev->data->dev_private;
        int op_2_acc[5] = {0, UL_4G, DL_4G, UL_5G, DL_5G};
        int acc = op_2_acc[conf->op_type];
        struct rte_acc100_queue_topology *qtop = NULL;

        qtopFromAcc(&qtop, acc, &(d->acc100_conf));
        if (qtop == NULL)
                return -1;
        /* Identify matching QGroup Index which are sorted in priority order */
        uint16_t group_idx = qtop->first_qgroup_index;
        group_idx += conf->priority;
        if (group_idx >= ACC100_NUM_QGRPS ||
                        conf->priority >= qtop->num_qgroups) {
                rte_bbdev_log(INFO, "Invalid Priority on %s, priority %u",
                                dev->data->name, conf->priority);
                return -1;
        }
        /* Find a free AQ_idx  */
        uint16_t aq_idx;
        for (aq_idx = 0; aq_idx < qtop->num_aqs_per_groups; aq_idx++) {
                if (((d->q_assigned_bit_map[group_idx] >> aq_idx) & 0x1) == 0) {
                        /* Mark the Queue as assigned */
                        d->q_assigned_bit_map[group_idx] |= (1 << aq_idx);
                        /* Report the AQ Index */
                        return (group_idx << ACC100_GRP_ID_SHIFT) + aq_idx;
                }
        }
        rte_bbdev_log(INFO, "Failed to find free queue on %s, priority %u",
                        dev->data->name, conf->priority);
        return -1;
}

/* Setup ACC100 queue */
static int
acc100_queue_setup(struct rte_bbdev *dev, uint16_t queue_id,
                const struct rte_bbdev_queue_conf *conf)
{
        struct acc100_device *d = dev->data->dev_private;
        struct acc100_queue *q;
        int16_t q_idx;

        /* Allocate the queue data structure. */
        q = rte_zmalloc_socket(dev->device->driver->name, sizeof(*q),
                        RTE_CACHE_LINE_SIZE, conf->socket);
        if (q == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate queue memory");
                return -ENOMEM;
        }
        if (d == NULL) {
                rte_bbdev_log(ERR, "Undefined device");
                return -ENODEV;
        }

        q->d = d;
        q->ring_addr = RTE_PTR_ADD(d->sw_rings, (d->sw_ring_size * queue_id));
        q->ring_addr_iova = d->sw_rings_iova + (d->sw_ring_size * queue_id);

        /* Prepare the Ring with default descriptor format */
        union acc100_dma_desc *desc = NULL;
        unsigned int desc_idx, b_idx;
        int fcw_len = (conf->op_type == RTE_BBDEV_OP_LDPC_ENC ?
                ACC100_FCW_LE_BLEN : (conf->op_type == RTE_BBDEV_OP_TURBO_DEC ?
                ACC100_FCW_TD_BLEN : ACC100_FCW_LD_BLEN));

        for (desc_idx = 0; desc_idx < d->sw_ring_max_depth; desc_idx++) {
                desc = q->ring_addr + desc_idx;
                desc->req.word0 = ACC100_DMA_DESC_TYPE;
                desc->req.word1 = 0; /**< Timestamp */
                desc->req.word2 = 0;
                desc->req.word3 = 0;
                uint64_t fcw_offset = (desc_idx << 8) + ACC100_DESC_FCW_OFFSET;
                desc->req.data_ptrs[0].address = q->ring_addr_iova + fcw_offset;
                desc->req.data_ptrs[0].blen = fcw_len;
                desc->req.data_ptrs[0].blkid = ACC100_DMA_BLKID_FCW;
                desc->req.data_ptrs[0].last = 0;
                desc->req.data_ptrs[0].dma_ext = 0;
                for (b_idx = 1; b_idx < ACC100_DMA_MAX_NUM_POINTERS - 1;
                                b_idx++) {
                        desc->req.data_ptrs[b_idx].blkid = ACC100_DMA_BLKID_IN;
                        desc->req.data_ptrs[b_idx].last = 1;
                        desc->req.data_ptrs[b_idx].dma_ext = 0;
                        b_idx++;
                        desc->req.data_ptrs[b_idx].blkid =
                                        ACC100_DMA_BLKID_OUT_ENC;
                        desc->req.data_ptrs[b_idx].last = 1;
                        desc->req.data_ptrs[b_idx].dma_ext = 0;
                }
                /* Preset some fields of LDPC FCW */
                desc->req.fcw_ld.FCWversion = ACC100_FCW_VER;
                desc->req.fcw_ld.gain_i = 1;
                desc->req.fcw_ld.gain_h = 1;
        }

        q->lb_in = rte_zmalloc_socket(dev->device->driver->name,
                        RTE_CACHE_LINE_SIZE,
                        RTE_CACHE_LINE_SIZE, conf->socket);
        if (q->lb_in == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate lb_in memory");
                rte_free(q);
                return -ENOMEM;
        }
        q->lb_in_addr_iova = rte_malloc_virt2iova(q->lb_in);
        q->lb_out = rte_zmalloc_socket(dev->device->driver->name,
                        RTE_CACHE_LINE_SIZE,
                        RTE_CACHE_LINE_SIZE, conf->socket);
        if (q->lb_out == NULL) {
                rte_bbdev_log(ERR, "Failed to allocate lb_out memory");
                rte_free(q->lb_in);
                rte_free(q);
                return -ENOMEM;
        }
        q->lb_out_addr_iova = rte_malloc_virt2iova(q->lb_out);

        /*
         * Software queue ring wraps synchronously with the HW when it reaches
         * the boundary of the maximum allocated queue size, no matter what the
         * sw queue size is. This wrapping is guarded by setting the wrap_mask
         * to represent the maximum queue size as allocated at the time when
         * the device has been setup (in configure()).
         *
         * The queue depth is set to the queue size value (conf->queue_size).
         * This limits the occupancy of the queue at any point of time, so that
         * the queue does not get swamped with enqueue requests.
         */
        q->sw_ring_depth = conf->queue_size;
        q->sw_ring_wrap_mask = d->sw_ring_max_depth - 1;

        q->op_type = conf->op_type;

        q_idx = acc100_find_free_queue_idx(dev, conf);
        if (q_idx == -1) {
                rte_free(q->lb_in);
                rte_free(q->lb_out);
                rte_free(q);
                return -1;
        }

        q->qgrp_id = (q_idx >> ACC100_GRP_ID_SHIFT) & 0xF;
        q->vf_id = (q_idx >> ACC100_VF_ID_SHIFT)  & 0x3F;
        q->aq_id = q_idx & 0xF;
        q->aq_depth = (conf->op_type ==  RTE_BBDEV_OP_TURBO_DEC) ?
                        (1 << d->acc100_conf.q_ul_4g.aq_depth_log2) :
                        (1 << d->acc100_conf.q_dl_4g.aq_depth_log2);

        q->mmio_reg_enqueue = RTE_PTR_ADD(d->mmio_base,
                        queue_offset(d->pf_device,
                                        q->vf_id, q->qgrp_id, q->aq_id));

        rte_bbdev_log_debug(
                        "Setup dev%u q%u: qgrp_id=%u, vf_id=%u, aq_id=%u, aq_depth=%u, mmio_reg_enqueue=%p",
                        dev->data->dev_id, queue_id, q->qgrp_id, q->vf_id,
                        q->aq_id, q->aq_depth, q->mmio_reg_enqueue);

        dev->data->queues[queue_id].queue_private = q;
        return 0;
}

/* Release ACC100 queue */
static int
acc100_queue_release(struct rte_bbdev *dev, uint16_t q_id)
{
        struct acc100_device *d = dev->data->dev_private;
        struct acc100_queue *q = dev->data->queues[q_id].queue_private;

        if (q != NULL) {
                /* Mark the Queue as un-assigned */
                d->q_assigned_bit_map[q->qgrp_id] &= (0xFFFFFFFF -
                                (1 << q->aq_id));
                rte_free(q->lb_in);
                rte_free(q->lb_out);
                rte_free(q);
                dev->data->queues[q_id].queue_private = NULL;
        }

        return 0;
}

/* Get ACC100 device info */
static void
acc100_dev_info_get(struct rte_bbdev *dev,
                struct rte_bbdev_driver_info *dev_info)
{
        struct acc100_device *d = dev->data->dev_private;

        static const struct rte_bbdev_op_cap bbdev_capabilities[] = {
                {
                        .type = RTE_BBDEV_OP_TURBO_DEC,
                        .cap.turbo_dec = {
                                .capability_flags =
                                        RTE_BBDEV_TURBO_SUBBLOCK_DEINTERLEAVE |
                                        RTE_BBDEV_TURBO_CRC_TYPE_24B |
                                        RTE_BBDEV_TURBO_HALF_ITERATION_EVEN |
                                        RTE_BBDEV_TURBO_EARLY_TERMINATION |
                                        RTE_BBDEV_TURBO_DEC_INTERRUPTS |
                                        RTE_BBDEV_TURBO_NEG_LLR_1_BIT_IN |
                                        RTE_BBDEV_TURBO_MAP_DEC |
                                        RTE_BBDEV_TURBO_DEC_TB_CRC_24B_KEEP |
                                        RTE_BBDEV_TURBO_DEC_CRC_24B_DROP |
                                        RTE_BBDEV_TURBO_DEC_SCATTER_GATHER,
                                .max_llr_modulus = INT8_MAX,
                                .num_buffers_src =
                                                RTE_BBDEV_TURBO_MAX_CODE_BLOCKS,
                                .num_buffers_hard_out =
                                                RTE_BBDEV_TURBO_MAX_CODE_BLOCKS,
                                .num_buffers_soft_out =
                                                RTE_BBDEV_TURBO_MAX_CODE_BLOCKS,
                        }
                },
                {
                        .type = RTE_BBDEV_OP_TURBO_ENC,
                        .cap.turbo_enc = {
                                .capability_flags =
                                        RTE_BBDEV_TURBO_CRC_24B_ATTACH |
                                        RTE_BBDEV_TURBO_RV_INDEX_BYPASS |
                                        RTE_BBDEV_TURBO_RATE_MATCH |

                                        RTE_BBDEV_TURBO_ENC_INTERRUPTS |
                                        RTE_BBDEV_TURBO_ENC_SCATTER_GATHER,
                                .num_buffers_src =
                                                RTE_BBDEV_TURBO_MAX_CODE_BLOCKS,
                                .num_buffers_dst =
                                                RTE_BBDEV_TURBO_MAX_CODE_BLOCKS,
                        }
                },
                {
                        .type   = RTE_BBDEV_OP_LDPC_ENC,
                        .cap.ldpc_enc = {
                                .capability_flags =
                                        RTE_BBDEV_LDPC_RATE_MATCH |
                                        RTE_BBDEV_LDPC_CRC_24B_ATTACH |
                                        RTE_BBDEV_LDPC_INTERLEAVER_BYPASS |
                                        RTE_BBDEV_LDPC_ENC_INTERRUPTS,
                                .num_buffers_src =
                                                RTE_BBDEV_LDPC_MAX_CODE_BLOCKS,
                                .num_buffers_dst =
                                                RTE_BBDEV_LDPC_MAX_CODE_BLOCKS,
                        }
                },
                {
                        .type   = RTE_BBDEV_OP_LDPC_DEC,
                        .cap.ldpc_dec = {
                        .capability_flags =
                                RTE_BBDEV_LDPC_CRC_TYPE_24B_CHECK |
                                RTE_BBDEV_LDPC_CRC_TYPE_24B_DROP |
                                RTE_BBDEV_LDPC_HQ_COMBINE_IN_ENABLE |
                                RTE_BBDEV_LDPC_HQ_COMBINE_OUT_ENABLE |
#ifdef ACC100_EXT_MEM
                                RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_LOOPBACK |
                                RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_IN_ENABLE |
                                RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_OUT_ENABLE |
#endif
                                RTE_BBDEV_LDPC_ITERATION_STOP_ENABLE |
                                RTE_BBDEV_LDPC_DEINTERLEAVER_BYPASS |
                                RTE_BBDEV_LDPC_DECODE_BYPASS |
                                RTE_BBDEV_LDPC_DEC_SCATTER_GATHER |
                                RTE_BBDEV_LDPC_HARQ_6BIT_COMPRESSION |
                                RTE_BBDEV_LDPC_LLR_COMPRESSION |
                                RTE_BBDEV_LDPC_DEC_INTERRUPTS,
                        .llr_size = 8,
                        .llr_decimals = 1,
                        .num_buffers_src =
                                        RTE_BBDEV_LDPC_MAX_CODE_BLOCKS,
                        .num_buffers_hard_out =
                                        RTE_BBDEV_LDPC_MAX_CODE_BLOCKS,
                        .num_buffers_soft_out = 0,
                        }
                },
                RTE_BBDEV_END_OF_CAPABILITIES_LIST()
        };

        static struct rte_bbdev_queue_conf default_queue_conf;
        default_queue_conf.socket = dev->data->socket_id;
        default_queue_conf.queue_size = ACC100_MAX_QUEUE_DEPTH;

        dev_info->driver_name = dev->device->driver->name;

        /* Read and save the populated config from ACC100 registers */
        fetch_acc100_config(dev);

        /* This isn't ideal because it reports the maximum number of queues but
         * does not provide info on how many can be uplink/downlink or different
         * priorities
         */
        dev_info->max_num_queues =
                        d->acc100_conf.q_dl_5g.num_aqs_per_groups *
                        d->acc100_conf.q_dl_5g.num_qgroups +
                        d->acc100_conf.q_ul_5g.num_aqs_per_groups *
                        d->acc100_conf.q_ul_5g.num_qgroups +
                        d->acc100_conf.q_dl_4g.num_aqs_per_groups *
                        d->acc100_conf.q_dl_4g.num_qgroups +
                        d->acc100_conf.q_ul_4g.num_aqs_per_groups *
                        d->acc100_conf.q_ul_4g.num_qgroups;
        dev_info->queue_size_lim = ACC100_MAX_QUEUE_DEPTH;
        dev_info->hardware_accelerated = true;
        dev_info->max_dl_queue_priority =
                        d->acc100_conf.q_dl_4g.num_qgroups - 1;
        dev_info->max_ul_queue_priority =
                        d->acc100_conf.q_ul_4g.num_qgroups - 1;
        dev_info->default_queue_conf = default_queue_conf;
        dev_info->cpu_flag_reqs = NULL;
        dev_info->min_alignment = 64;
        dev_info->capabilities = bbdev_capabilities;
#ifdef ACC100_EXT_MEM
        dev_info->harq_buffer_size = d->ddr_size;
#else
        dev_info->harq_buffer_size = 0;
#endif
        dev_info->data_endianness = RTE_LITTLE_ENDIAN;
        acc100_check_ir(d);
}

static int
acc100_queue_intr_enable(struct rte_bbdev *dev, uint16_t queue_id)
{
        struct acc100_queue *q = dev->data->queues[queue_id].queue_private;

        if (rte_intr_type_get(dev->intr_handle) != RTE_INTR_HANDLE_VFIO_MSI &&
                        rte_intr_type_get(dev->intr_handle) != RTE_INTR_HANDLE_UIO)
                return -ENOTSUP;

        q->irq_enable = 1;
        return 0;
}

static int
acc100_queue_intr_disable(struct rte_bbdev *dev, uint16_t queue_id)
{
        struct acc100_queue *q = dev->data->queues[queue_id].queue_private;

        if (rte_intr_type_get(dev->intr_handle) != RTE_INTR_HANDLE_VFIO_MSI &&
                        rte_intr_type_get(dev->intr_handle) != RTE_INTR_HANDLE_UIO)
                return -ENOTSUP;

        q->irq_enable = 0;
        return 0;
}

static const struct rte_bbdev_ops acc100_bbdev_ops = {
        .setup_queues = acc100_setup_queues,
        .intr_enable = acc100_intr_enable,
        .close = acc100_dev_close,
        .info_get = acc100_dev_info_get,
        .queue_setup = acc100_queue_setup,
        .queue_release = acc100_queue_release,
        .queue_intr_enable = acc100_queue_intr_enable,
        .queue_intr_disable = acc100_queue_intr_disable
};

/* ACC100 PCI PF address map */
static struct rte_pci_id pci_id_acc100_pf_map[] = {
        {
                RTE_PCI_DEVICE(RTE_ACC100_VENDOR_ID, RTE_ACC100_PF_DEVICE_ID)
        },
        {.device_id = 0},
};

/* ACC100 PCI VF address map */
static struct rte_pci_id pci_id_acc100_vf_map[] = {
        {
                RTE_PCI_DEVICE(RTE_ACC100_VENDOR_ID, RTE_ACC100_VF_DEVICE_ID)
        },
        {.device_id = 0},
};

/* Read flag value 0/1 from bitmap */
static inline bool
check_bit(uint32_t bitmap, uint32_t bitmask)
{
        return bitmap & bitmask;
}

static inline char *
mbuf_append(struct rte_mbuf *m_head, struct rte_mbuf *m, uint16_t len)
{
        if (unlikely(len > rte_pktmbuf_tailroom(m)))
                return NULL;

        char *tail = (char *)m->buf_addr + m->data_off + m->data_len;
        m->data_len = (uint16_t)(m->data_len + len);
        m_head->pkt_len  = (m_head->pkt_len + len);
        return tail;
}

/* Fill in a frame control word for turbo encoding. */
static inline void
acc100_fcw_te_fill(const struct rte_bbdev_enc_op *op, struct acc100_fcw_te *fcw)
{
        fcw->code_block_mode = op->turbo_enc.code_block_mode;
        if (fcw->code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK) {
                fcw->k_neg = op->turbo_enc.tb_params.k_neg;
                fcw->k_pos = op->turbo_enc.tb_params.k_pos;
                fcw->c_neg = op->turbo_enc.tb_params.c_neg;
                fcw->c = op->turbo_enc.tb_params.c;
                fcw->ncb_neg = op->turbo_enc.tb_params.ncb_neg;
                fcw->ncb_pos = op->turbo_enc.tb_params.ncb_pos;

                if (check_bit(op->turbo_enc.op_flags,
                                RTE_BBDEV_TURBO_RATE_MATCH)) {
                        fcw->bypass_rm = 0;
                        fcw->cab = op->turbo_enc.tb_params.cab;
                        fcw->ea = op->turbo_enc.tb_params.ea;
                        fcw->eb = op->turbo_enc.tb_params.eb;
                } else {
                        /* E is set to the encoding output size when RM is
                         * bypassed.
                         */
                        fcw->bypass_rm = 1;
                        fcw->cab = fcw->c_neg;
                        fcw->ea = 3 * fcw->k_neg + 12;
                        fcw->eb = 3 * fcw->k_pos + 12;
                }
        } else { /* For CB mode */
                fcw->k_pos = op->turbo_enc.cb_params.k;
                fcw->ncb_pos = op->turbo_enc.cb_params.ncb;

                if (check_bit(op->turbo_enc.op_flags,
                                RTE_BBDEV_TURBO_RATE_MATCH)) {
                        fcw->bypass_rm = 0;
                        fcw->eb = op->turbo_enc.cb_params.e;
                } else {
                        /* E is set to the encoding output size when RM is
                         * bypassed.
                         */
                        fcw->bypass_rm = 1;
                        fcw->eb = 3 * fcw->k_pos + 12;
                }
        }

        fcw->bypass_rv_idx1 = check_bit(op->turbo_enc.op_flags,
                        RTE_BBDEV_TURBO_RV_INDEX_BYPASS);
        fcw->code_block_crc = check_bit(op->turbo_enc.op_flags,
                        RTE_BBDEV_TURBO_CRC_24B_ATTACH);
        fcw->rv_idx1 = op->turbo_enc.rv_index;
}

/* Compute value of k0.
 * Based on 3GPP 38.212 Table 5.4.2.1-2
 * Starting position of different redundancy versions, k0
 */
static inline uint16_t
get_k0(uint16_t n_cb, uint16_t z_c, uint8_t bg, uint8_t rv_index)
{
        if (rv_index == 0)
                return 0;
        uint16_t n = (bg == 1 ? ACC100_N_ZC_1 : ACC100_N_ZC_2) * z_c;
        if (n_cb == n) {
                if (rv_index == 1)
                        return (bg == 1 ? ACC100_K0_1_1 : ACC100_K0_1_2) * z_c;
                else if (rv_index == 2)
                        return (bg == 1 ? ACC100_K0_2_1 : ACC100_K0_2_2) * z_c;
                else
                        return (bg == 1 ? ACC100_K0_3_1 : ACC100_K0_3_2) * z_c;
        }
        /* LBRM case - includes a division by N */
        if (rv_index == 1)
                return (((bg == 1 ? ACC100_K0_1_1 : ACC100_K0_1_2) * n_cb)
                                / n) * z_c;
        else if (rv_index == 2)
                return (((bg == 1 ? ACC100_K0_2_1 : ACC100_K0_2_2) * n_cb)
                                / n) * z_c;
        else
                return (((bg == 1 ? ACC100_K0_3_1 : ACC100_K0_3_2) * n_cb)
                                / n) * z_c;
}

/* Fill in a frame control word for LDPC encoding. */
static inline void
acc100_fcw_le_fill(const struct rte_bbdev_enc_op *op,
                struct acc100_fcw_le *fcw, int num_cb)
{
        fcw->qm = op->ldpc_enc.q_m;
        fcw->nfiller = op->ldpc_enc.n_filler;
        fcw->BG = (op->ldpc_enc.basegraph - 1);
        fcw->Zc = op->ldpc_enc.z_c;
        fcw->ncb = op->ldpc_enc.n_cb;
        fcw->k0 = get_k0(fcw->ncb, fcw->Zc, op->ldpc_enc.basegraph,
                        op->ldpc_enc.rv_index);
        fcw->rm_e = op->ldpc_enc.cb_params.e;
        fcw->crc_select = check_bit(op->ldpc_enc.op_flags,
                        RTE_BBDEV_LDPC_CRC_24B_ATTACH);
        fcw->bypass_intlv = check_bit(op->ldpc_enc.op_flags,
                        RTE_BBDEV_LDPC_INTERLEAVER_BYPASS);
        fcw->mcb_count = num_cb;
}

/* Fill in a frame control word for turbo decoding. */
static inline void
acc100_fcw_td_fill(const struct rte_bbdev_dec_op *op, struct acc100_fcw_td *fcw)
{
        /* Note : Early termination is always enabled for 4GUL */
        fcw->fcw_ver = 1;
        if (op->turbo_dec.code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK)
                fcw->k_pos = op->turbo_dec.tb_params.k_pos;
        else
                fcw->k_pos = op->turbo_dec.cb_params.k;
        fcw->turbo_crc_type = check_bit(op->turbo_dec.op_flags,
                        RTE_BBDEV_TURBO_CRC_TYPE_24B);
        fcw->bypass_sb_deint = 0;
        fcw->raw_decoder_input_on = 0;
        fcw->max_iter = op->turbo_dec.iter_max;
        fcw->half_iter_on = !check_bit(op->turbo_dec.op_flags,
                        RTE_BBDEV_TURBO_HALF_ITERATION_EVEN);
}

/* Fill in a frame control word for LDPC decoding. */
static inline void
acc100_fcw_ld_fill(const struct rte_bbdev_dec_op *op, struct acc100_fcw_ld *fcw,
                union acc100_harq_layout_data *harq_layout)
{
        uint16_t harq_out_length, harq_in_length, ncb_p, k0_p, parity_offset;
        uint16_t harq_index;
        uint32_t l;
        bool harq_prun = false;

        fcw->qm = op->ldpc_dec.q_m;
        fcw->nfiller = op->ldpc_dec.n_filler;
        fcw->BG = (op->ldpc_dec.basegraph - 1);
        fcw->Zc = op->ldpc_dec.z_c;
        fcw->ncb = op->ldpc_dec.n_cb;
        fcw->k0 = get_k0(fcw->ncb, fcw->Zc, op->ldpc_dec.basegraph,
                        op->ldpc_dec.rv_index);
        if (op->ldpc_dec.code_block_mode == RTE_BBDEV_CODE_BLOCK)
                fcw->rm_e = op->ldpc_dec.cb_params.e;
        else
                fcw->rm_e = (op->ldpc_dec.tb_params.r <
                                op->ldpc_dec.tb_params.cab) ?
                                                op->ldpc_dec.tb_params.ea :
                                                op->ldpc_dec.tb_params.eb;

        fcw->hcin_en = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_HQ_COMBINE_IN_ENABLE);
        fcw->hcout_en = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_HQ_COMBINE_OUT_ENABLE);
        fcw->crc_select = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_CRC_TYPE_24B_CHECK);
        fcw->bypass_dec = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_DECODE_BYPASS);
        fcw->bypass_intlv = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_DEINTERLEAVER_BYPASS);
        if (op->ldpc_dec.q_m == 1) {
                fcw->bypass_intlv = 1;
                fcw->qm = 2;
        }
        fcw->hcin_decomp_mode = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_HARQ_6BIT_COMPRESSION);
        fcw->hcout_comp_mode = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_HARQ_6BIT_COMPRESSION);
        fcw->llr_pack_mode = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_LLR_COMPRESSION);
        harq_index = op->ldpc_dec.harq_combined_output.offset /
                        ACC100_HARQ_OFFSET;
#ifdef ACC100_EXT_MEM
        /* Limit cases when HARQ pruning is valid */
        harq_prun = ((op->ldpc_dec.harq_combined_output.offset %
                        ACC100_HARQ_OFFSET) == 0) &&
                        (op->ldpc_dec.harq_combined_output.offset <= UINT16_MAX
                        * ACC100_HARQ_OFFSET);
#endif
        if (fcw->hcin_en > 0) {
                harq_in_length = op->ldpc_dec.harq_combined_input.length;
                if (fcw->hcin_decomp_mode > 0)
                        harq_in_length = harq_in_length * 8 / 6;
                harq_in_length = RTE_ALIGN(harq_in_length, 64);
                if ((harq_layout[harq_index].offset > 0) & harq_prun) {
                        rte_bbdev_log_debug("HARQ IN offset unexpected for now\n");
                        fcw->hcin_size0 = harq_layout[harq_index].size0;
                        fcw->hcin_offset = harq_layout[harq_index].offset;
                        fcw->hcin_size1 = harq_in_length -
                                        harq_layout[harq_index].offset;
                } else {
                        fcw->hcin_size0 = harq_in_length;
                        fcw->hcin_offset = 0;
                        fcw->hcin_size1 = 0;
                }
        } else {
                fcw->hcin_size0 = 0;
                fcw->hcin_offset = 0;
                fcw->hcin_size1 = 0;
        }

        fcw->itmax = op->ldpc_dec.iter_max;
        fcw->itstop = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_ITERATION_STOP_ENABLE);
        fcw->synd_precoder = fcw->itstop;
        /*
         * These are all implicitly set
         * fcw->synd_post = 0;
         * fcw->so_en = 0;
         * fcw->so_bypass_rm = 0;
         * fcw->so_bypass_intlv = 0;
         * fcw->dec_convllr = 0;
         * fcw->hcout_convllr = 0;
         * fcw->hcout_size1 = 0;
         * fcw->so_it = 0;
         * fcw->hcout_offset = 0;
         * fcw->negstop_th = 0;
         * fcw->negstop_it = 0;
         * fcw->negstop_en = 0;
         * fcw->gain_i = 1;
         * fcw->gain_h = 1;
         */
        if (fcw->hcout_en > 0) {
                parity_offset = (op->ldpc_dec.basegraph == 1 ? 20 : 8)
                        * op->ldpc_dec.z_c - op->ldpc_dec.n_filler;
                k0_p = (fcw->k0 > parity_offset) ?
                                fcw->k0 - op->ldpc_dec.n_filler : fcw->k0;
                ncb_p = fcw->ncb - op->ldpc_dec.n_filler;
                l = k0_p + fcw->rm_e;
                harq_out_length = (uint16_t) fcw->hcin_size0;
                harq_out_length = RTE_MIN(RTE_MAX(harq_out_length, l), ncb_p);
                harq_out_length = (harq_out_length + 0x3F) & 0xFFC0;
                if ((k0_p > fcw->hcin_size0 + ACC100_HARQ_OFFSET_THRESHOLD) &&
                                harq_prun) {
                        fcw->hcout_size0 = (uint16_t) fcw->hcin_size0;
                        fcw->hcout_offset = k0_p & 0xFFC0;
                        fcw->hcout_size1 = harq_out_length - fcw->hcout_offset;
                } else {
                        fcw->hcout_size0 = harq_out_length;
                        fcw->hcout_size1 = 0;
                        fcw->hcout_offset = 0;
                }
                harq_layout[harq_index].offset = fcw->hcout_offset;
                harq_layout[harq_index].size0 = fcw->hcout_size0;
        } else {
                fcw->hcout_size0 = 0;
                fcw->hcout_size1 = 0;
                fcw->hcout_offset = 0;
        }
}

/**
 * Fills descriptor with data pointers of one block type.
 *
 * @param desc
 *   Pointer to DMA descriptor.
 * @param input
 *   Pointer to pointer to input data which will be encoded. It can be changed
 *   and points to next segment in scatter-gather case.
 * @param offset
 *   Input offset in rte_mbuf structure. It is used for calculating the point
 *   where data is starting.
 * @param cb_len
 *   Length of currently processed Code Block
 * @param seg_total_left
 *   It indicates how many bytes still left in segment (mbuf) for further
 *   processing.
 * @param op_flags
 *   Store information about device capabilities
 * @param next_triplet
 *   Index for ACC100 DMA Descriptor triplet
 *
 * @return
 *   Returns index of next triplet on success, other value if lengths of
 *   pkt and processed cb do not match.
 *
 */
static inline int
acc100_dma_fill_blk_type_in(struct acc100_dma_req_desc *desc,
                struct rte_mbuf **input, uint32_t *offset, uint32_t cb_len,
                uint32_t *seg_total_left, int next_triplet)
{
        uint32_t part_len;
        struct rte_mbuf *m = *input;

        part_len = (*seg_total_left < cb_len) ? *seg_total_left : cb_len;
        cb_len -= part_len;
        *seg_total_left -= part_len;

        desc->data_ptrs[next_triplet].address =
                        rte_pktmbuf_iova_offset(m, *offset);
        desc->data_ptrs[next_triplet].blen = part_len;
        desc->data_ptrs[next_triplet].blkid = ACC100_DMA_BLKID_IN;
        desc->data_ptrs[next_triplet].last = 0;
        desc->data_ptrs[next_triplet].dma_ext = 0;
        *offset += part_len;
        next_triplet++;

        while (cb_len > 0) {
                if (next_triplet < ACC100_DMA_MAX_NUM_POINTERS_IN && m->next != NULL) {

                        m = m->next;
                        *seg_total_left = rte_pktmbuf_data_len(m);
                        part_len = (*seg_total_left < cb_len) ?
                                        *seg_total_left :
                                        cb_len;
                        desc->data_ptrs[next_triplet].address =
                                        rte_pktmbuf_iova_offset(m, 0);
                        desc->data_ptrs[next_triplet].blen = part_len;
                        desc->data_ptrs[next_triplet].blkid =
                                        ACC100_DMA_BLKID_IN;
                        desc->data_ptrs[next_triplet].last = 0;
                        desc->data_ptrs[next_triplet].dma_ext = 0;
                        cb_len -= part_len;
                        *seg_total_left -= part_len;
                        /* Initializing offset for next segment (mbuf) */
                        *offset = part_len;
                        next_triplet++;
                } else {
                        rte_bbdev_log(ERR,
                                "Some data still left for processing: "
                                "data_left: %u, next_triplet: %u, next_mbuf: %p",
                                cb_len, next_triplet, m->next);
                        return -EINVAL;
                }
        }
        /* Storing new mbuf as it could be changed in scatter-gather case*/
        *input = m;

        return next_triplet;
}

/* Fills descriptor with data pointers of one block type.
 * Returns index of next triplet on success, other value if lengths of
 * output data and processed mbuf do not match.
 */
static inline int
acc100_dma_fill_blk_type_out(struct acc100_dma_req_desc *desc,
                struct rte_mbuf *output, uint32_t out_offset,
                uint32_t output_len, int next_triplet, int blk_id)
{
        desc->data_ptrs[next_triplet].address =
                        rte_pktmbuf_iova_offset(output, out_offset);
        desc->data_ptrs[next_triplet].blen = output_len;
        desc->data_ptrs[next_triplet].blkid = blk_id;
        desc->data_ptrs[next_triplet].last = 0;
        desc->data_ptrs[next_triplet].dma_ext = 0;
        next_triplet++;

        return next_triplet;
}

static inline void
acc100_header_init(struct acc100_dma_req_desc *desc)
{
        desc->word0 = ACC100_DMA_DESC_TYPE;
        desc->word1 = 0; /**< Timestamp could be disabled */
        desc->word2 = 0;
        desc->word3 = 0;
        desc->numCBs = 1;
}

#ifdef RTE_LIBRTE_BBDEV_DEBUG
/* Check if any input data is unexpectedly left for processing */
static inline int
check_mbuf_total_left(uint32_t mbuf_total_left)
{
        if (mbuf_total_left == 0)
                return 0;
        rte_bbdev_log(ERR,
                "Some date still left for processing: mbuf_total_left = %u",
                mbuf_total_left);
        return -EINVAL;
}
#endif

static inline int
acc100_dma_desc_te_fill(struct rte_bbdev_enc_op *op,
                struct acc100_dma_req_desc *desc, struct rte_mbuf **input,
                struct rte_mbuf *output, uint32_t *in_offset,
                uint32_t *out_offset, uint32_t *out_length,
                uint32_t *mbuf_total_left, uint32_t *seg_total_left, uint8_t r)
{
        int next_triplet = 1; /* FCW already done */
        uint32_t e, ea, eb, length;
        uint16_t k, k_neg, k_pos;
        uint8_t cab, c_neg;

        desc->word0 = ACC100_DMA_DESC_TYPE;
        desc->word1 = 0; /**< Timestamp could be disabled */
        desc->word2 = 0;
        desc->word3 = 0;
        desc->numCBs = 1;

        if (op->turbo_enc.code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK) {
                ea = op->turbo_enc.tb_params.ea;
                eb = op->turbo_enc.tb_params.eb;
                cab = op->turbo_enc.tb_params.cab;
                k_neg = op->turbo_enc.tb_params.k_neg;
                k_pos = op->turbo_enc.tb_params.k_pos;
                c_neg = op->turbo_enc.tb_params.c_neg;
                e = (r < cab) ? ea : eb;
                k = (r < c_neg) ? k_neg : k_pos;
        } else {
                e = op->turbo_enc.cb_params.e;
                k = op->turbo_enc.cb_params.k;
        }

        if (check_bit(op->turbo_enc.op_flags, RTE_BBDEV_TURBO_CRC_24B_ATTACH))
                length = (k - 24) >> 3;
        else
                length = k >> 3;

        if (unlikely((*mbuf_total_left == 0) || (*mbuf_total_left < length))) {
                rte_bbdev_log(ERR,
                                "Mismatch between mbuf length and included CB sizes: mbuf len %u, cb len %u",
                                *mbuf_total_left, length);
                return -1;
        }

        next_triplet = acc100_dma_fill_blk_type_in(desc, input, in_offset,
                        length, seg_total_left, next_triplet);
        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->m2dlen = next_triplet;
        *mbuf_total_left -= length;

        /* Set output length */
        if (check_bit(op->turbo_enc.op_flags, RTE_BBDEV_TURBO_RATE_MATCH))
                /* Integer round up division by 8 */
                *out_length = (e + 7) >> 3;
        else
                *out_length = (k >> 3) * 3 + 2;

        next_triplet = acc100_dma_fill_blk_type_out(desc, output, *out_offset,
                        *out_length, next_triplet, ACC100_DMA_BLKID_OUT_ENC);
        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }
        op->turbo_enc.output.length += *out_length;
        *out_offset += *out_length;
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->d2mlen = next_triplet - desc->m2dlen;

        desc->op_addr = op;

        return 0;
}

static inline int
acc100_dma_desc_le_fill(struct rte_bbdev_enc_op *op,
                struct acc100_dma_req_desc *desc, struct rte_mbuf **input,
                struct rte_mbuf *output, uint32_t *in_offset,
                uint32_t *out_offset, uint32_t *out_length,
                uint32_t *mbuf_total_left, uint32_t *seg_total_left)
{
        int next_triplet = 1; /* FCW already done */
        uint16_t K, in_length_in_bits, in_length_in_bytes;
        struct rte_bbdev_op_ldpc_enc *enc = &op->ldpc_enc;

        acc100_header_init(desc);

        K = (enc->basegraph == 1 ? 22 : 10) * enc->z_c;
        in_length_in_bits = K - enc->n_filler;
        if ((enc->op_flags & RTE_BBDEV_LDPC_CRC_24A_ATTACH) ||
                        (enc->op_flags & RTE_BBDEV_LDPC_CRC_24B_ATTACH))
                in_length_in_bits -= 24;
        in_length_in_bytes = in_length_in_bits >> 3;

        if (unlikely((*mbuf_total_left == 0) ||
                        (*mbuf_total_left < in_length_in_bytes))) {
                rte_bbdev_log(ERR,
                                "Mismatch between mbuf length and included CB sizes: mbuf len %u, cb len %u",
                                *mbuf_total_left, in_length_in_bytes);
                return -1;
        }

        next_triplet = acc100_dma_fill_blk_type_in(desc, input, in_offset,
                        in_length_in_bytes,
                        seg_total_left, next_triplet);
        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->m2dlen = next_triplet;
        *mbuf_total_left -= in_length_in_bytes;

        /* Set output length */
        /* Integer round up division by 8 */
        *out_length = (enc->cb_params.e + 7) >> 3;

        next_triplet = acc100_dma_fill_blk_type_out(desc, output, *out_offset,
                        *out_length, next_triplet, ACC100_DMA_BLKID_OUT_ENC);
        op->ldpc_enc.output.length += *out_length;
        *out_offset += *out_length;
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->data_ptrs[next_triplet - 1].dma_ext = 0;
        desc->d2mlen = next_triplet - desc->m2dlen;

        desc->op_addr = op;

        return 0;
}

static inline int
acc100_dma_desc_td_fill(struct rte_bbdev_dec_op *op,
                struct acc100_dma_req_desc *desc, struct rte_mbuf **input,
                struct rte_mbuf *h_output, struct rte_mbuf *s_output,
                uint32_t *in_offset, uint32_t *h_out_offset,
                uint32_t *s_out_offset, uint32_t *h_out_length,
                uint32_t *s_out_length, uint32_t *mbuf_total_left,
                uint32_t *seg_total_left, uint8_t r)
{
        int next_triplet = 1; /* FCW already done */
        uint16_t k;
        uint16_t crc24_overlap = 0;
        uint32_t e, kw;

        desc->word0 = ACC100_DMA_DESC_TYPE;
        desc->word1 = 0; /**< Timestamp could be disabled */
        desc->word2 = 0;
        desc->word3 = 0;
        desc->numCBs = 1;

        if (op->turbo_dec.code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK) {
                k = (r < op->turbo_dec.tb_params.c_neg)
                        ? op->turbo_dec.tb_params.k_neg
                        : op->turbo_dec.tb_params.k_pos;
                e = (r < op->turbo_dec.tb_params.cab)
                        ? op->turbo_dec.tb_params.ea
                        : op->turbo_dec.tb_params.eb;
        } else {
                k = op->turbo_dec.cb_params.k;
                e = op->turbo_dec.cb_params.e;
        }

        if ((op->turbo_dec.code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK)
                        && !check_bit(op->turbo_dec.op_flags,
                        RTE_BBDEV_TURBO_DEC_TB_CRC_24B_KEEP))
                crc24_overlap = 24;
        if ((op->turbo_dec.code_block_mode == RTE_BBDEV_CODE_BLOCK)
                        && check_bit(op->turbo_dec.op_flags,
                        RTE_BBDEV_TURBO_DEC_CRC_24B_DROP))
                crc24_overlap = 24;

        /* Calculates circular buffer size.
         * According to 3gpp 36.212 section 5.1.4.2
         *   Kw = 3 * Kpi,
         * where:
         *   Kpi = nCol * nRow
         * where nCol is 32 and nRow can be calculated from:
         *   D =< nCol * nRow
         * where D is the size of each output from turbo encoder block (k + 4).
         */
        kw = RTE_ALIGN_CEIL(k + 4, 32) * 3;

        if (unlikely((*mbuf_total_left == 0) || (*mbuf_total_left < kw))) {
                rte_bbdev_log(ERR,
                                "Mismatch between mbuf length and included CB sizes: mbuf len %u, cb len %u",
                                *mbuf_total_left, kw);
                return -1;
        }

        next_triplet = acc100_dma_fill_blk_type_in(desc, input, in_offset, kw,
                        seg_total_left, next_triplet);
        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->m2dlen = next_triplet;
        *mbuf_total_left -= kw;

        next_triplet = acc100_dma_fill_blk_type_out(
                        desc, h_output, *h_out_offset,
                        (k - crc24_overlap) >> 3, next_triplet,
                        ACC100_DMA_BLKID_OUT_HARD);
        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }

        *h_out_length = ((k - crc24_overlap) >> 3);
        op->turbo_dec.hard_output.length += *h_out_length;
        *h_out_offset += *h_out_length;

        /* Soft output */
        if (check_bit(op->turbo_dec.op_flags, RTE_BBDEV_TURBO_SOFT_OUTPUT)) {
                if (check_bit(op->turbo_dec.op_flags,
                                RTE_BBDEV_TURBO_EQUALIZER))
                        *s_out_length = e;
                else
                        *s_out_length = (k * 3) + 12;

                next_triplet = acc100_dma_fill_blk_type_out(desc, s_output,
                                *s_out_offset, *s_out_length, next_triplet,
                                ACC100_DMA_BLKID_OUT_SOFT);
                if (unlikely(next_triplet < 0)) {
                        rte_bbdev_log(ERR,
                                        "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                        op);
                        return -1;
                }

                op->turbo_dec.soft_output.length += *s_out_length;
                *s_out_offset += *s_out_length;
        }

        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->d2mlen = next_triplet - desc->m2dlen;

        desc->op_addr = op;

        return 0;
}

static inline int
acc100_dma_desc_ld_fill(struct rte_bbdev_dec_op *op,
                struct acc100_dma_req_desc *desc,
                struct rte_mbuf **input, struct rte_mbuf *h_output,
                uint32_t *in_offset, uint32_t *h_out_offset,
                uint32_t *h_out_length, uint32_t *mbuf_total_left,
                uint32_t *seg_total_left,
                struct acc100_fcw_ld *fcw)
{
        struct rte_bbdev_op_ldpc_dec *dec = &op->ldpc_dec;
        int next_triplet = 1; /* FCW already done */
        uint32_t input_length;
        uint16_t output_length, crc24_overlap = 0;
        uint16_t sys_cols, K, h_p_size, h_np_size;
        bool h_comp = check_bit(dec->op_flags,
                        RTE_BBDEV_LDPC_HARQ_6BIT_COMPRESSION);

        acc100_header_init(desc);

        if (check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_CRC_TYPE_24B_DROP))
                crc24_overlap = 24;

        /* Compute some LDPC BG lengths */
        input_length = dec->cb_params.e;
        if (check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_LLR_COMPRESSION))
                input_length = (input_length * 3 + 3) / 4;
        sys_cols = (dec->basegraph == 1) ? 22 : 10;
        K = sys_cols * dec->z_c;
        output_length = K - dec->n_filler - crc24_overlap;

        if (unlikely((*mbuf_total_left == 0) ||
                        (*mbuf_total_left < input_length))) {
                rte_bbdev_log(ERR,
                                "Mismatch between mbuf length and included CB sizes: mbuf len %u, cb len %u",
                                *mbuf_total_left, input_length);
                return -1;
        }

        next_triplet = acc100_dma_fill_blk_type_in(desc, input,
                        in_offset, input_length,
                        seg_total_left, next_triplet);

        if (unlikely(next_triplet < 0)) {
                rte_bbdev_log(ERR,
                                "Mismatch between data to process and mbuf data length in bbdev_op: %p",
                                op);
                return -1;
        }

        if (check_bit(op->ldpc_dec.op_flags,
                                RTE_BBDEV_LDPC_HQ_COMBINE_IN_ENABLE)) {
                h_p_size = fcw->hcin_size0 + fcw->hcin_size1;
                if (h_comp)
                        h_p_size = (h_p_size * 3 + 3) / 4;
                desc->data_ptrs[next_triplet].address =
                                dec->harq_combined_input.offset;
                desc->data_ptrs[next_triplet].blen = h_p_size;
                desc->data_ptrs[next_triplet].blkid = ACC100_DMA_BLKID_IN_HARQ;
                desc->data_ptrs[next_triplet].dma_ext = 1;
#ifndef ACC100_EXT_MEM
                acc100_dma_fill_blk_type_out(
                                desc,
                                op->ldpc_dec.harq_combined_input.data,
                                op->ldpc_dec.harq_combined_input.offset,
                                h_p_size,
                                next_triplet,
                                ACC100_DMA_BLKID_IN_HARQ);
#endif
                next_triplet++;
        }

        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->m2dlen = next_triplet;
        *mbuf_total_left -= input_length;

        next_triplet = acc100_dma_fill_blk_type_out(desc, h_output,
                        *h_out_offset, output_length >> 3, next_triplet,
                        ACC100_DMA_BLKID_OUT_HARD);

        if (check_bit(op->ldpc_dec.op_flags,
                                RTE_BBDEV_LDPC_HQ_COMBINE_OUT_ENABLE)) {
                /* Pruned size of the HARQ */
                h_p_size = fcw->hcout_size0 + fcw->hcout_size1;
                /* Non-Pruned size of the HARQ */
                h_np_size = fcw->hcout_offset > 0 ?
                                fcw->hcout_offset + fcw->hcout_size1 :
                                h_p_size;
                if (h_comp) {
                        h_np_size = (h_np_size * 3 + 3) / 4;
                        h_p_size = (h_p_size * 3 + 3) / 4;
                }
                dec->harq_combined_output.length = h_np_size;
                desc->data_ptrs[next_triplet].address =
                                dec->harq_combined_output.offset;
                desc->data_ptrs[next_triplet].blen = h_p_size;
                desc->data_ptrs[next_triplet].blkid = ACC100_DMA_BLKID_OUT_HARQ;
                desc->data_ptrs[next_triplet].dma_ext = 1;
#ifndef ACC100_EXT_MEM
                acc100_dma_fill_blk_type_out(
                                desc,
                                dec->harq_combined_output.data,
                                dec->harq_combined_output.offset,
                                h_p_size,
                                next_triplet,
                                ACC100_DMA_BLKID_OUT_HARQ);
#endif
                next_triplet++;
        }

        *h_out_length = output_length >> 3;
        dec->hard_output.length += *h_out_length;
        *h_out_offset += *h_out_length;
        desc->data_ptrs[next_triplet - 1].last = 1;
        desc->d2mlen = next_triplet - desc->m2dlen;

        desc->op_addr = op;

        return 0;
}

static inline void
acc100_dma_desc_ld_update(struct rte_bbdev_dec_op *op,
                struct acc100_dma_req_desc *desc,
                struct rte_mbuf *input, struct rte_mbuf *h_output,
                uint32_t *in_offset, uint32_t *h_out_offset,
                uint32_t *h_out_length,
                union acc100_harq_layout_data *harq_layout)
{
        int next_triplet = 1; /* FCW already done */
        desc->data_ptrs[next_triplet].address =
                        rte_pktmbuf_iova_offset(input, *in_offset);
        next_triplet++;

        if (check_bit(op->ldpc_dec.op_flags,
                                RTE_BBDEV_LDPC_HQ_COMBINE_IN_ENABLE)) {
                struct rte_bbdev_op_data hi = op->ldpc_dec.harq_combined_input;
                desc->data_ptrs[next_triplet].address = hi.offset;
#ifndef ACC100_EXT_MEM
                desc->data_ptrs[next_triplet].address =
                                rte_pktmbuf_iova_offset(hi.data, hi.offset);
#endif
                next_triplet++;
        }

        desc->data_ptrs[next_triplet].address =
                        rte_pktmbuf_iova_offset(h_output, *h_out_offset);
        *h_out_length = desc->data_ptrs[next_triplet].blen;
        next_triplet++;

        if (check_bit(op->ldpc_dec.op_flags,
                                RTE_BBDEV_LDPC_HQ_COMBINE_OUT_ENABLE)) {
                desc->data_ptrs[next_triplet].address =
                                op->ldpc_dec.harq_combined_output.offset;
                /* Adjust based on previous operation */
                struct rte_bbdev_dec_op *prev_op = desc->op_addr;
                op->ldpc_dec.harq_combined_output.length =
                                prev_op->ldpc_dec.harq_combined_output.length;
                int16_t hq_idx = op->ldpc_dec.harq_combined_output.offset /
                                ACC100_HARQ_OFFSET;
                int16_t prev_hq_idx =
                                prev_op->ldpc_dec.harq_combined_output.offset
                                / ACC100_HARQ_OFFSET;
                harq_layout[hq_idx].val = harq_layout[prev_hq_idx].val;
#ifndef ACC100_EXT_MEM
                struct rte_bbdev_op_data ho =
                                op->ldpc_dec.harq_combined_output;
                desc->data_ptrs[next_triplet].address =
                                rte_pktmbuf_iova_offset(ho.data, ho.offset);
#endif
                next_triplet++;
        }

        op->ldpc_dec.hard_output.length += *h_out_length;
        desc->op_addr = op;
}


/* Enqueue a number of operations to HW and update software rings */
static inline void
acc100_dma_enqueue(struct acc100_queue *q, uint16_t n,
                struct rte_bbdev_stats *queue_stats)
{
        union acc100_enqueue_reg_fmt enq_req;
#ifdef RTE_BBDEV_OFFLOAD_COST
        uint64_t start_time = 0;
        queue_stats->acc_offload_cycles = 0;
#else
        RTE_SET_USED(queue_stats);
#endif

        enq_req.val = 0;
        /* Setting offset, 100b for 256 DMA Desc */
        enq_req.addr_offset = ACC100_DESC_OFFSET;

        /* Split ops into batches */
        do {
                union acc100_dma_desc *desc;
                uint16_t enq_batch_size;
                uint64_t offset;
                rte_iova_t req_elem_addr;

                enq_batch_size = RTE_MIN(n, MAX_ENQ_BATCH_SIZE);

                /* Set flag on last descriptor in a batch */

                desc = q->ring_addr + ((q->sw_ring_head + enq_batch_size - 1) &
                                q->sw_ring_wrap_mask);
                desc->req.last_desc_in_batch = 1;

                /* Calculate the 1st descriptor's address */
                offset = ((q->sw_ring_head & q->sw_ring_wrap_mask) *
                                sizeof(union acc100_dma_desc));
                req_elem_addr = q->ring_addr_iova + offset;

                /* Fill enqueue struct */
                enq_req.num_elem = enq_batch_size;
                /* low 6 bits are not needed */
                enq_req.req_elem_addr = (uint32_t)(req_elem_addr >> 6);

#ifdef RTE_LIBRTE_BBDEV_DEBUG
                rte_memdump(stderr, "Req sdone", desc, sizeof(*desc));
#endif
                rte_bbdev_log_debug(
                                "Enqueue %u reqs (phys %#"PRIx64") to reg %p",
                                enq_batch_size,
                                req_elem_addr,
                                (void *)q->mmio_reg_enqueue);

                rte_wmb();

#ifdef RTE_BBDEV_OFFLOAD_COST
                /* Start time measurement for enqueue function offload. */
                start_time = rte_rdtsc_precise();
#endif
                rte_bbdev_log(DEBUG, "Debug : MMIO Enqueue");
                mmio_write(q->mmio_reg_enqueue, enq_req.val);

#ifdef RTE_BBDEV_OFFLOAD_COST
                queue_stats->acc_offload_cycles +=
                                rte_rdtsc_precise() - start_time;
#endif

                q->aq_enqueued++;
                q->sw_ring_head += enq_batch_size;
                n -= enq_batch_size;

        } while (n);


}

#ifdef RTE_LIBRTE_BBDEV_DEBUG
/* Validates turbo encoder parameters */
static inline int
validate_enc_op(struct rte_bbdev_enc_op *op)
{
        struct rte_bbdev_op_turbo_enc *turbo_enc = &op->turbo_enc;
        struct rte_bbdev_op_enc_turbo_cb_params *cb = NULL;
        struct rte_bbdev_op_enc_turbo_tb_params *tb = NULL;
        uint16_t kw, kw_neg, kw_pos;

        if (op->mempool == NULL) {
                rte_bbdev_log(ERR, "Invalid mempool pointer");
                return -1;
        }
        if (turbo_enc->input.data == NULL) {
                rte_bbdev_log(ERR, "Invalid input pointer");
                return -1;
        }
        if (turbo_enc->output.data == NULL) {
                rte_bbdev_log(ERR, "Invalid output pointer");
                return -1;
        }
        if (turbo_enc->rv_index > 3) {
                rte_bbdev_log(ERR,
                                "rv_index (%u) is out of range 0 <= value <= 3",
                                turbo_enc->rv_index);
                return -1;
        }
        if (turbo_enc->code_block_mode != RTE_BBDEV_TRANSPORT_BLOCK &&
                        turbo_enc->code_block_mode != RTE_BBDEV_CODE_BLOCK) {
                rte_bbdev_log(ERR,
                                "code_block_mode (%u) is out of range 0 <= value <= 1",
                                turbo_enc->code_block_mode);
                return -1;
        }

        if (turbo_enc->code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK) {
                tb = &turbo_enc->tb_params;
                if ((tb->k_neg < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || tb->k_neg > RTE_BBDEV_TURBO_MAX_CB_SIZE)
                                && tb->c_neg > 0) {
                        rte_bbdev_log(ERR,
                                        "k_neg (%u) is out of range %u <= value <= %u",
                                        tb->k_neg, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }
                if (tb->k_pos < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || tb->k_pos > RTE_BBDEV_TURBO_MAX_CB_SIZE) {
                        rte_bbdev_log(ERR,
                                        "k_pos (%u) is out of range %u <= value <= %u",
                                        tb->k_pos, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }
                if (tb->c_neg > (RTE_BBDEV_TURBO_MAX_CODE_BLOCKS - 1))
                        rte_bbdev_log(ERR,
                                        "c_neg (%u) is out of range 0 <= value <= %u",
                                        tb->c_neg,
                                        RTE_BBDEV_TURBO_MAX_CODE_BLOCKS - 1);
                if (tb->c < 1 || tb->c > RTE_BBDEV_TURBO_MAX_CODE_BLOCKS) {
                        rte_bbdev_log(ERR,
                                        "c (%u) is out of range 1 <= value <= %u",
                                        tb->c, RTE_BBDEV_TURBO_MAX_CODE_BLOCKS);
                        return -1;
                }
                if (tb->cab > tb->c) {
                        rte_bbdev_log(ERR,
                                        "cab (%u) is greater than c (%u)",
                                        tb->cab, tb->c);
                        return -1;
                }
                if ((tb->ea < RTE_BBDEV_TURBO_MIN_CB_SIZE || (tb->ea % 2))
                                && tb->r < tb->cab) {
                        rte_bbdev_log(ERR,
                                        "ea (%u) is less than %u or it is not even",
                                        tb->ea, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                        return -1;
                }
                if ((tb->eb < RTE_BBDEV_TURBO_MIN_CB_SIZE || (tb->eb % 2))
                                && tb->c > tb->cab) {
                        rte_bbdev_log(ERR,
                                        "eb (%u) is less than %u or it is not even",
                                        tb->eb, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                        return -1;
                }

                kw_neg = 3 * RTE_ALIGN_CEIL(tb->k_neg + 4,
                                        RTE_BBDEV_TURBO_C_SUBBLOCK);
                if (tb->ncb_neg < tb->k_neg || tb->ncb_neg > kw_neg) {
                        rte_bbdev_log(ERR,
                                        "ncb_neg (%u) is out of range (%u) k_neg <= value <= (%u) kw_neg",
                                        tb->ncb_neg, tb->k_neg, kw_neg);
                        return -1;
                }

                kw_pos = 3 * RTE_ALIGN_CEIL(tb->k_pos + 4,
                                        RTE_BBDEV_TURBO_C_SUBBLOCK);
                if (tb->ncb_pos < tb->k_pos || tb->ncb_pos > kw_pos) {
                        rte_bbdev_log(ERR,
                                        "ncb_pos (%u) is out of range (%u) k_pos <= value <= (%u) kw_pos",
                                        tb->ncb_pos, tb->k_pos, kw_pos);
                        return -1;
                }
                if (tb->r > (tb->c - 1)) {
                        rte_bbdev_log(ERR,
                                        "r (%u) is greater than c - 1 (%u)",
                                        tb->r, tb->c - 1);
                        return -1;
                }
        } else {
                cb = &turbo_enc->cb_params;
                if (cb->k < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || cb->k > RTE_BBDEV_TURBO_MAX_CB_SIZE) {
                        rte_bbdev_log(ERR,
                                        "k (%u) is out of range %u <= value <= %u",
                                        cb->k, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }

                if (cb->e < RTE_BBDEV_TURBO_MIN_CB_SIZE || (cb->e % 2)) {
                        rte_bbdev_log(ERR,
                                        "e (%u) is less than %u or it is not even",
                                        cb->e, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                        return -1;
                }

                kw = RTE_ALIGN_CEIL(cb->k + 4, RTE_BBDEV_TURBO_C_SUBBLOCK) * 3;
                if (cb->ncb < cb->k || cb->ncb > kw) {
                        rte_bbdev_log(ERR,
                                        "ncb (%u) is out of range (%u) k <= value <= (%u) kw",
                                        cb->ncb, cb->k, kw);
                        return -1;
                }
        }

        return 0;
}
/* Validates LDPC encoder parameters */
static inline int
validate_ldpc_enc_op(struct rte_bbdev_enc_op *op)
{
        struct rte_bbdev_op_ldpc_enc *ldpc_enc = &op->ldpc_enc;

        if (op->mempool == NULL) {
                rte_bbdev_log(ERR, "Invalid mempool pointer");
                return -1;
        }
        if (ldpc_enc->input.data == NULL) {
                rte_bbdev_log(ERR, "Invalid input pointer");
                return -1;
        }
        if (ldpc_enc->output.data == NULL) {
                rte_bbdev_log(ERR, "Invalid output pointer");
                return -1;
        }
        if (ldpc_enc->input.length >
                        RTE_BBDEV_LDPC_MAX_CB_SIZE >> 3) {
                rte_bbdev_log(ERR, "CB size (%u) is too big, max: %d",
                                ldpc_enc->input.length,
                                RTE_BBDEV_LDPC_MAX_CB_SIZE);
                return -1;
        }
        if ((ldpc_enc->basegraph > 2) || (ldpc_enc->basegraph == 0)) {
                rte_bbdev_log(ERR,
                                "BG (%u) is out of range 1 <= value <= 2",
                                ldpc_enc->basegraph);
                return -1;
        }
        if (ldpc_enc->rv_index > 3) {
                rte_bbdev_log(ERR,
                                "rv_index (%u) is out of range 0 <= value <= 3",
                                ldpc_enc->rv_index);
                return -1;
        }
        if (ldpc_enc->code_block_mode > RTE_BBDEV_CODE_BLOCK) {
                rte_bbdev_log(ERR,
                                "code_block_mode (%u) is out of range 0 <= value <= 1",
                                ldpc_enc->code_block_mode);
                return -1;
        }
        int K = (ldpc_enc->basegraph == 1 ? 22 : 10) * ldpc_enc->z_c;
        if (ldpc_enc->n_filler >= K) {
                rte_bbdev_log(ERR,
                                "K and F are not compatible %u %u",
                                K, ldpc_enc->n_filler);
                return -1;
        }
        return 0;
}

/* Validates LDPC decoder parameters */
static inline int
validate_ldpc_dec_op(struct rte_bbdev_dec_op *op)
{
        struct rte_bbdev_op_ldpc_dec *ldpc_dec = &op->ldpc_dec;

        if (op->mempool == NULL) {
                rte_bbdev_log(ERR, "Invalid mempool pointer");
                return -1;
        }
        if ((ldpc_dec->basegraph > 2) || (ldpc_dec->basegraph == 0)) {
                rte_bbdev_log(ERR,
                                "BG (%u) is out of range 1 <= value <= 2",
                                ldpc_dec->basegraph);
                return -1;
        }
        if (ldpc_dec->iter_max == 0) {
                rte_bbdev_log(ERR,
                                "iter_max (%u) is equal to 0",
                                ldpc_dec->iter_max);
                return -1;
        }
        if (ldpc_dec->rv_index > 3) {
                rte_bbdev_log(ERR,
                                "rv_index (%u) is out of range 0 <= value <= 3",
                                ldpc_dec->rv_index);
                return -1;
        }
        if (ldpc_dec->code_block_mode > RTE_BBDEV_CODE_BLOCK) {
                rte_bbdev_log(ERR,
                                "code_block_mode (%u) is out of range 0 <= value <= 1",
                                ldpc_dec->code_block_mode);
                return -1;
        }
        int K = (ldpc_dec->basegraph == 1 ? 22 : 10) * ldpc_dec->z_c;
        if (ldpc_dec->n_filler >= K) {
                rte_bbdev_log(ERR,
                                "K and F are not compatible %u %u",
                                K, ldpc_dec->n_filler);
                return -1;
        }
        return 0;
}
#endif

/* Enqueue one encode operations for ACC100 device in CB mode */
static inline int
enqueue_enc_one_op_cb(struct acc100_queue *q, struct rte_bbdev_enc_op *op,
                uint16_t total_enqueued_cbs)
{
        union acc100_dma_desc *desc = NULL;
        int ret;
        uint32_t in_offset, out_offset, out_length, mbuf_total_left,
                seg_total_left;
        struct rte_mbuf *input, *output_head, *output;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_enc_op(op) == -1) {
                rte_bbdev_log(ERR, "Turbo encoder validation failed");
                return -EINVAL;
        }
#endif

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        acc100_fcw_te_fill(op, &desc->req.fcw_te);

        input = op->turbo_enc.input.data;
        output_head = output = op->turbo_enc.output.data;
        in_offset = op->turbo_enc.input.offset;
        out_offset = op->turbo_enc.output.offset;
        out_length = 0;
        mbuf_total_left = op->turbo_enc.input.length;
        seg_total_left = rte_pktmbuf_data_len(op->turbo_enc.input.data)
                        - in_offset;

        ret = acc100_dma_desc_te_fill(op, &desc->req, &input, output,
                        &in_offset, &out_offset, &out_length, &mbuf_total_left,
                        &seg_total_left, 0);

        if (unlikely(ret < 0))
                return ret;

        mbuf_append(output_head, output, out_length);

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        rte_memdump(stderr, "FCW", &desc->req.fcw_te,
                        sizeof(desc->req.fcw_te) - 8);
        rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));
        if (check_mbuf_total_left(mbuf_total_left) != 0)
                return -EINVAL;
#endif
        /* One CB (one op) was successfully prepared to enqueue */
        return 1;
}

/* Enqueue one encode operations for ACC100 device in CB mode */
static inline int
enqueue_ldpc_enc_n_op_cb(struct acc100_queue *q, struct rte_bbdev_enc_op **ops,
                uint16_t total_enqueued_cbs, int16_t num)
{
        union acc100_dma_desc *desc = NULL;
        uint32_t out_length;
        struct rte_mbuf *output_head, *output;
        int i, next_triplet;
        uint16_t  in_length_in_bytes;
        struct rte_bbdev_op_ldpc_enc *enc = &ops[0]->ldpc_enc;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_ldpc_enc_op(ops[0]) == -1) {
                rte_bbdev_log(ERR, "LDPC encoder validation failed");
                return -EINVAL;
        }
#endif

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        acc100_fcw_le_fill(ops[0], &desc->req.fcw_le, num);

        /** This could be done at polling */
        acc100_header_init(&desc->req);
        desc->req.numCBs = num;

        in_length_in_bytes = ops[0]->ldpc_enc.input.data->data_len;
        out_length = (enc->cb_params.e + 7) >> 3;
        desc->req.m2dlen = 1 + num;
        desc->req.d2mlen = num;
        next_triplet = 1;

        for (i = 0; i < num; i++) {
                desc->req.data_ptrs[next_triplet].address =
                        rte_pktmbuf_iova_offset(ops[i]->ldpc_enc.input.data, 0);
                desc->req.data_ptrs[next_triplet].blen = in_length_in_bytes;
                next_triplet++;
                desc->req.data_ptrs[next_triplet].address =
                                rte_pktmbuf_iova_offset(
                                ops[i]->ldpc_enc.output.data, 0);
                desc->req.data_ptrs[next_triplet].blen = out_length;
                next_triplet++;
                ops[i]->ldpc_enc.output.length = out_length;
                output_head = output = ops[i]->ldpc_enc.output.data;
                mbuf_append(output_head, output, out_length);
                output->data_len = out_length;
        }

        desc->req.op_addr = ops[0];

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        rte_memdump(stderr, "FCW", &desc->req.fcw_le,
                        sizeof(desc->req.fcw_le) - 8);
        rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));
#endif

        /* One CB (one op) was successfully prepared to enqueue */
        return num;
}

/* Enqueue one encode operations for ACC100 device in CB mode */
static inline int
enqueue_ldpc_enc_one_op_cb(struct acc100_queue *q, struct rte_bbdev_enc_op *op,
                uint16_t total_enqueued_cbs)
{
        union acc100_dma_desc *desc = NULL;
        int ret;
        uint32_t in_offset, out_offset, out_length, mbuf_total_left,
                seg_total_left;
        struct rte_mbuf *input, *output_head, *output;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_ldpc_enc_op(op) == -1) {
                rte_bbdev_log(ERR, "LDPC encoder validation failed");
                return -EINVAL;
        }
#endif

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        acc100_fcw_le_fill(op, &desc->req.fcw_le, 1);

        input = op->ldpc_enc.input.data;
        output_head = output = op->ldpc_enc.output.data;
        in_offset = op->ldpc_enc.input.offset;
        out_offset = op->ldpc_enc.output.offset;
        out_length = 0;
        mbuf_total_left = op->ldpc_enc.input.length;
        seg_total_left = rte_pktmbuf_data_len(op->ldpc_enc.input.data)
                        - in_offset;

        ret = acc100_dma_desc_le_fill(op, &desc->req, &input, output,
                        &in_offset, &out_offset, &out_length, &mbuf_total_left,
                        &seg_total_left);

        if (unlikely(ret < 0))
                return ret;

        mbuf_append(output_head, output, out_length);

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        rte_memdump(stderr, "FCW", &desc->req.fcw_le,
                        sizeof(desc->req.fcw_le) - 8);
        rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));

        if (check_mbuf_total_left(mbuf_total_left) != 0)
                return -EINVAL;
#endif
        /* One CB (one op) was successfully prepared to enqueue */
        return 1;
}


/* Enqueue one encode operations for ACC100 device in TB mode. */
static inline int
enqueue_enc_one_op_tb(struct acc100_queue *q, struct rte_bbdev_enc_op *op,
                uint16_t total_enqueued_cbs, uint8_t cbs_in_tb)
{
        union acc100_dma_desc *desc = NULL;
        int ret;
        uint8_t r, c;
        uint32_t in_offset, out_offset, out_length, mbuf_total_left,
                seg_total_left;
        struct rte_mbuf *input, *output_head, *output;
        uint16_t current_enqueued_cbs = 0;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_enc_op(op) == -1) {
                rte_bbdev_log(ERR, "Turbo encoder validation failed");
                return -EINVAL;
        }
#endif

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        uint64_t fcw_offset = (desc_idx << 8) + ACC100_DESC_FCW_OFFSET;
        acc100_fcw_te_fill(op, &desc->req.fcw_te);

        input = op->turbo_enc.input.data;
        output_head = output = op->turbo_enc.output.data;
        in_offset = op->turbo_enc.input.offset;
        out_offset = op->turbo_enc.output.offset;
        out_length = 0;
        mbuf_total_left = op->turbo_enc.input.length;

        c = op->turbo_enc.tb_params.c;
        r = op->turbo_enc.tb_params.r;

        while (mbuf_total_left > 0 && r < c) {
                seg_total_left = rte_pktmbuf_data_len(input) - in_offset;
                /* Set up DMA descriptor */
                desc = q->ring_addr + ((q->sw_ring_head + total_enqueued_cbs)
                                & q->sw_ring_wrap_mask);
                desc->req.data_ptrs[0].address = q->ring_addr_iova + fcw_offset;
                desc->req.data_ptrs[0].blen = ACC100_FCW_TE_BLEN;

                ret = acc100_dma_desc_te_fill(op, &desc->req, &input, output,
                                &in_offset, &out_offset, &out_length,
                                &mbuf_total_left, &seg_total_left, r);
                if (unlikely(ret < 0))
                        return ret;
                mbuf_append(output_head, output, out_length);

                /* Set total number of CBs in TB */
                desc->req.cbs_in_tb = cbs_in_tb;
#ifdef RTE_LIBRTE_BBDEV_DEBUG
                rte_memdump(stderr, "FCW", &desc->req.fcw_te,
                                sizeof(desc->req.fcw_te) - 8);
                rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));
#endif

                if (seg_total_left == 0) {
                        /* Go to the next mbuf */
                        input = input->next;
                        in_offset = 0;
                        output = output->next;
                        out_offset = 0;
                }

                total_enqueued_cbs++;
                current_enqueued_cbs++;
                r++;
        }

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        if (check_mbuf_total_left(mbuf_total_left) != 0)
                return -EINVAL;
#endif

        /* Set SDone on last CB descriptor for TB mode. */
        desc->req.sdone_enable = 1;
        desc->req.irq_enable = q->irq_enable;

        return current_enqueued_cbs;
}

#ifdef RTE_LIBRTE_BBDEV_DEBUG
/* Validates turbo decoder parameters */
static inline int
validate_dec_op(struct rte_bbdev_dec_op *op)
{
        struct rte_bbdev_op_turbo_dec *turbo_dec = &op->turbo_dec;
        struct rte_bbdev_op_dec_turbo_cb_params *cb = NULL;
        struct rte_bbdev_op_dec_turbo_tb_params *tb = NULL;

        if (op->mempool == NULL) {
                rte_bbdev_log(ERR, "Invalid mempool pointer");
                return -1;
        }
        if (turbo_dec->input.data == NULL) {
                rte_bbdev_log(ERR, "Invalid input pointer");
                return -1;
        }
        if (turbo_dec->hard_output.data == NULL) {
                rte_bbdev_log(ERR, "Invalid hard_output pointer");
                return -1;
        }
        if (check_bit(turbo_dec->op_flags, RTE_BBDEV_TURBO_SOFT_OUTPUT) &&
                        turbo_dec->soft_output.data == NULL) {
                rte_bbdev_log(ERR, "Invalid soft_output pointer");
                return -1;
        }
        if (turbo_dec->rv_index > 3) {
                rte_bbdev_log(ERR,
                                "rv_index (%u) is out of range 0 <= value <= 3",
                                turbo_dec->rv_index);
                return -1;
        }
        if (turbo_dec->iter_min < 1) {
                rte_bbdev_log(ERR,
                                "iter_min (%u) is less than 1",
                                turbo_dec->iter_min);
                return -1;
        }
        if (turbo_dec->iter_max <= 2) {
                rte_bbdev_log(ERR,
                                "iter_max (%u) is less than or equal to 2",
                                turbo_dec->iter_max);
                return -1;
        }
        if (turbo_dec->iter_min > turbo_dec->iter_max) {
                rte_bbdev_log(ERR,
                                "iter_min (%u) is greater than iter_max (%u)",
                                turbo_dec->iter_min, turbo_dec->iter_max);
                return -1;
        }
        if (turbo_dec->code_block_mode != RTE_BBDEV_TRANSPORT_BLOCK &&
                        turbo_dec->code_block_mode != RTE_BBDEV_CODE_BLOCK) {
                rte_bbdev_log(ERR,
                                "code_block_mode (%u) is out of range 0 <= value <= 1",
                                turbo_dec->code_block_mode);
                return -1;
        }

        if (turbo_dec->code_block_mode == RTE_BBDEV_TRANSPORT_BLOCK) {
                tb = &turbo_dec->tb_params;
                if ((tb->k_neg < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || tb->k_neg > RTE_BBDEV_TURBO_MAX_CB_SIZE)
                                && tb->c_neg > 0) {
                        rte_bbdev_log(ERR,
                                        "k_neg (%u) is out of range %u <= value <= %u",
                                        tb->k_neg, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }
                if ((tb->k_pos < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || tb->k_pos > RTE_BBDEV_TURBO_MAX_CB_SIZE)
                                && tb->c > tb->c_neg) {
                        rte_bbdev_log(ERR,
                                        "k_pos (%u) is out of range %u <= value <= %u",
                                        tb->k_pos, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }
                if (tb->c_neg > (RTE_BBDEV_TURBO_MAX_CODE_BLOCKS - 1))
                        rte_bbdev_log(ERR,
                                        "c_neg (%u) is out of range 0 <= value <= %u",
                                        tb->c_neg,
                                        RTE_BBDEV_TURBO_MAX_CODE_BLOCKS - 1);
                if (tb->c < 1 || tb->c > RTE_BBDEV_TURBO_MAX_CODE_BLOCKS) {
                        rte_bbdev_log(ERR,
                                        "c (%u) is out of range 1 <= value <= %u",
                                        tb->c, RTE_BBDEV_TURBO_MAX_CODE_BLOCKS);
                        return -1;
                }
                if (tb->cab > tb->c) {
                        rte_bbdev_log(ERR,
                                        "cab (%u) is greater than c (%u)",
                                        tb->cab, tb->c);
                        return -1;
                }
                if (check_bit(turbo_dec->op_flags, RTE_BBDEV_TURBO_EQUALIZER) &&
                                (tb->ea < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                                || (tb->ea % 2))
                                && tb->cab > 0) {
                        rte_bbdev_log(ERR,
                                        "ea (%u) is less than %u or it is not even",
                                        tb->ea, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                        return -1;
                }
                if (check_bit(turbo_dec->op_flags, RTE_BBDEV_TURBO_EQUALIZER) &&
                                (tb->eb < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                                || (tb->eb % 2))
                                && tb->c > tb->cab) {
                        rte_bbdev_log(ERR,
                                        "eb (%u) is less than %u or it is not even",
                                        tb->eb, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                }
        } else {
                cb = &turbo_dec->cb_params;
                if (cb->k < RTE_BBDEV_TURBO_MIN_CB_SIZE
                                || cb->k > RTE_BBDEV_TURBO_MAX_CB_SIZE) {
                        rte_bbdev_log(ERR,
                                        "k (%u) is out of range %u <= value <= %u",
                                        cb->k, RTE_BBDEV_TURBO_MIN_CB_SIZE,
                                        RTE_BBDEV_TURBO_MAX_CB_SIZE);
                        return -1;
                }
                if (check_bit(turbo_dec->op_flags, RTE_BBDEV_TURBO_EQUALIZER) &&
                                (cb->e < RTE_BBDEV_TURBO_MIN_CB_SIZE ||
                                (cb->e % 2))) {
                        rte_bbdev_log(ERR,
                                        "e (%u) is less than %u or it is not even",
                                        cb->e, RTE_BBDEV_TURBO_MIN_CB_SIZE);
                        return -1;
                }
        }

        return 0;
}
#endif

/** Enqueue one decode operations for ACC100 device in CB mode */
static inline int
enqueue_dec_one_op_cb(struct acc100_queue *q, struct rte_bbdev_dec_op *op,
                uint16_t total_enqueued_cbs)
{
        union acc100_dma_desc *desc = NULL;
        int ret;
        uint32_t in_offset, h_out_offset, s_out_offset, s_out_length,
                h_out_length, mbuf_total_left, seg_total_left;
        struct rte_mbuf *input, *h_output_head, *h_output,
                *s_output_head, *s_output;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_dec_op(op) == -1) {
                rte_bbdev_log(ERR, "Turbo decoder validation failed");
                return -EINVAL;
        }
#endif

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        acc100_fcw_td_fill(op, &desc->req.fcw_td);

        input = op->turbo_dec.input.data;
        h_output_head = h_output = op->turbo_dec.hard_output.data;
        s_output_head = s_output = op->turbo_dec.soft_output.data;
        in_offset = op->turbo_dec.input.offset;
        h_out_offset = op->turbo_dec.hard_output.offset;
        s_out_offset = op->turbo_dec.soft_output.offset;
        h_out_length = s_out_length = 0;
        mbuf_total_left = op->turbo_dec.input.length;
        seg_total_left = rte_pktmbuf_data_len(input) - in_offset;

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        if (unlikely(input == NULL)) {
                rte_bbdev_log(ERR, "Invalid mbuf pointer");
                return -EFAULT;
        }
#endif

        /* Set up DMA descriptor */
        desc = q->ring_addr + ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);

        ret = acc100_dma_desc_td_fill(op, &desc->req, &input, h_output,
                        s_output, &in_offset, &h_out_offset, &s_out_offset,
                        &h_out_length, &s_out_length, &mbuf_total_left,
                        &seg_total_left, 0);

        if (unlikely(ret < 0))
                return ret;

        /* Hard output */
        mbuf_append(h_output_head, h_output, h_out_length);

        /* Soft output */
        if (check_bit(op->turbo_dec.op_flags, RTE_BBDEV_TURBO_SOFT_OUTPUT))
                mbuf_append(s_output_head, s_output, s_out_length);

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        rte_memdump(stderr, "FCW", &desc->req.fcw_td,
                        sizeof(desc->req.fcw_td) - 8);
        rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));
        if (check_mbuf_total_left(mbuf_total_left) != 0)
                return -EINVAL;
#endif

        /* One CB (one op) was successfully prepared to enqueue */
        return 1;
}

static inline int
harq_loopback(struct acc100_queue *q, struct rte_bbdev_dec_op *op,
                uint16_t total_enqueued_cbs) {
        struct acc100_fcw_ld *fcw;
        union acc100_dma_desc *desc;
        int next_triplet = 1;
        struct rte_mbuf *hq_output_head, *hq_output;
        uint16_t harq_dma_length_in, harq_dma_length_out;
        uint16_t harq_in_length = op->ldpc_dec.harq_combined_input.length;
        if (harq_in_length == 0) {
                rte_bbdev_log(ERR, "Loopback of invalid null size\n");
                return -EINVAL;
        }

        int h_comp = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_HARQ_6BIT_COMPRESSION
                        ) ? 1 : 0;
        if (h_comp == 1) {
                harq_in_length = harq_in_length * 8 / 6;
                harq_in_length = RTE_ALIGN(harq_in_length, 64);
                harq_dma_length_in = harq_in_length * 6 / 8;
        } else {
                harq_in_length = RTE_ALIGN(harq_in_length, 64);
                harq_dma_length_in = harq_in_length;
        }
        harq_dma_length_out = harq_dma_length_in;

        bool ddr_mem_in = check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_IN_ENABLE);
        union acc100_harq_layout_data *harq_layout = q->d->harq_layout;
        uint16_t harq_index = (ddr_mem_in ?
                        op->ldpc_dec.harq_combined_input.offset :
                        op->ldpc_dec.harq_combined_output.offset)
                        / ACC100_HARQ_OFFSET;

        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        fcw = &desc->req.fcw_ld;
        /* Set the FCW from loopback into DDR */
        memset(fcw, 0, sizeof(struct acc100_fcw_ld));
        fcw->FCWversion = ACC100_FCW_VER;
        fcw->qm = 2;
        fcw->Zc = 384;
        if (harq_in_length < 16 * ACC100_N_ZC_1)
                fcw->Zc = 16;
        fcw->ncb = fcw->Zc * ACC100_N_ZC_1;
        fcw->rm_e = 2;
        fcw->hcin_en = 1;
        fcw->hcout_en = 1;

        rte_bbdev_log(DEBUG, "Loopback IN %d Index %d offset %d length %d %d\n",
                        ddr_mem_in, harq_index,
                        harq_layout[harq_index].offset, harq_in_length,
                        harq_dma_length_in);

        if (ddr_mem_in && (harq_layout[harq_index].offset > 0)) {
                fcw->hcin_size0 = harq_layout[harq_index].size0;
                fcw->hcin_offset = harq_layout[harq_index].offset;
                fcw->hcin_size1 = harq_in_length - fcw->hcin_offset;
                harq_dma_length_in = (fcw->hcin_size0 + fcw->hcin_size1);
                if (h_comp == 1)
                        harq_dma_length_in = harq_dma_length_in * 6 / 8;
        } else {
                fcw->hcin_size0 = harq_in_length;
        }
        harq_layout[harq_index].val = 0;
        rte_bbdev_log(DEBUG, "Loopback FCW Config %d %d %d\n",
                        fcw->hcin_size0, fcw->hcin_offset, fcw->hcin_size1);
        fcw->hcout_size0 = harq_in_length;
        fcw->hcin_decomp_mode = h_comp;
        fcw->hcout_comp_mode = h_comp;
        fcw->gain_i = 1;
        fcw->gain_h = 1;

        /* Set the prefix of descriptor. This could be done at polling */
        acc100_header_init(&desc->req);

        /* Null LLR input for Decoder */
        desc->req.data_ptrs[next_triplet].address =
                        q->lb_in_addr_iova;
        desc->req.data_ptrs[next_triplet].blen = 2;
        desc->req.data_ptrs[next_triplet].blkid = ACC100_DMA_BLKID_IN;
        desc->req.data_ptrs[next_triplet].last = 0;
        desc->req.data_ptrs[next_triplet].dma_ext = 0;
        next_triplet++;

        /* HARQ Combine input from either Memory interface */
        if (!ddr_mem_in) {
                next_triplet = acc100_dma_fill_blk_type_out(&desc->req,
                                op->ldpc_dec.harq_combined_input.data,
                                op->ldpc_dec.harq_combined_input.offset,
                                harq_dma_length_in,
                                next_triplet,
                                ACC100_DMA_BLKID_IN_HARQ);
        } else {
                desc->req.data_ptrs[next_triplet].address =
                                op->ldpc_dec.harq_combined_input.offset;
                desc->req.data_ptrs[next_triplet].blen =
                                harq_dma_length_in;
                desc->req.data_ptrs[next_triplet].blkid =
                                ACC100_DMA_BLKID_IN_HARQ;
                desc->req.data_ptrs[next_triplet].dma_ext = 1;
                next_triplet++;
        }
        desc->req.data_ptrs[next_triplet - 1].last = 1;
        desc->req.m2dlen = next_triplet;

        /* Dropped decoder hard output */
        desc->req.data_ptrs[next_triplet].address =
                        q->lb_out_addr_iova;
        desc->req.data_ptrs[next_triplet].blen = ACC100_BYTES_IN_WORD;
        desc->req.data_ptrs[next_triplet].blkid = ACC100_DMA_BLKID_OUT_HARD;
        desc->req.data_ptrs[next_triplet].last = 0;
        desc->req.data_ptrs[next_triplet].dma_ext = 0;
        next_triplet++;

        /* HARQ Combine output to either Memory interface */
        if (check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_OUT_ENABLE
                        )) {
                desc->req.data_ptrs[next_triplet].address =
                                op->ldpc_dec.harq_combined_output.offset;
                desc->req.data_ptrs[next_triplet].blen =
                                harq_dma_length_out;
                desc->req.data_ptrs[next_triplet].blkid =
                                ACC100_DMA_BLKID_OUT_HARQ;
                desc->req.data_ptrs[next_triplet].dma_ext = 1;
                next_triplet++;
        } else {
                hq_output_head = op->ldpc_dec.harq_combined_output.data;
                hq_output = op->ldpc_dec.harq_combined_output.data;
                next_triplet = acc100_dma_fill_blk_type_out(
                                &desc->req,
                                op->ldpc_dec.harq_combined_output.data,
                                op->ldpc_dec.harq_combined_output.offset,
                                harq_dma_length_out,
                                next_triplet,
                                ACC100_DMA_BLKID_OUT_HARQ);
                /* HARQ output */
                mbuf_append(hq_output_head, hq_output, harq_dma_length_out);
                op->ldpc_dec.harq_combined_output.length =
                                harq_dma_length_out;
        }
        desc->req.data_ptrs[next_triplet - 1].last = 1;
        desc->req.d2mlen = next_triplet - desc->req.m2dlen;
        desc->req.op_addr = op;

        /* One CB (one op) was successfully prepared to enqueue */
        return 1;
}

/** Enqueue one decode operations for ACC100 device in CB mode */
static inline int
enqueue_ldpc_dec_one_op_cb(struct acc100_queue *q, struct rte_bbdev_dec_op *op,
                uint16_t total_enqueued_cbs, bool same_op)
{
        int ret;
        if (unlikely(check_bit(op->ldpc_dec.op_flags,
                        RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_LOOPBACK))) {
                ret = harq_loopback(q, op, total_enqueued_cbs);
                return ret;
        }

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        /* Validate op structure */
        if (validate_ldpc_dec_op(op) == -1) {
                rte_bbdev_log(ERR, "LDPC decoder validation failed");
                return -EINVAL;
        }
#endif
        union acc100_dma_desc *desc;
        uint16_t desc_idx = ((q->sw_ring_head + total_enqueued_cbs)
                        & q->sw_ring_wrap_mask);
        desc = q->ring_addr + desc_idx;
        struct rte_mbuf *input, *h_output_head, *h_output;
        uint32_t in_offset, h_out_offset, mbuf_total_left, h_out_length = 0;
        input = op->ldpc_dec.input.data;
        h_output_head = h_output = op->ldpc_dec.hard_output.data;
        in_offset = op->ldpc_dec.input.offset;
        h_out_offset = op->ldpc_dec.hard_output.offset;
        mbuf_total_left = op->ldpc_dec.input.length;
#ifdef RTE_LIBRTE_BBDEV_DEBUG
        if (unlikely(input == NULL)) {
                rte_bbdev_log(ERR, "Invalid mbuf pointer");
                return -EFAULT;
        }
#endif
        union acc100_harq_layout_data *harq_layout = q->d->harq_layout;

        if (same_op) {
                union acc100_dma_desc *prev_desc;
                desc_idx = ((q->sw_ring_head + total_enqueued_cbs - 1)
                                & q->sw_ring_wrap_mask);
                prev_desc = q->ring_addr + desc_idx;
                uint8_t *prev_ptr = (uint8_t *) prev_desc;
                uint8_t *new_ptr = (uint8_t *) desc;
                /* Copy first 4 words and BDESCs */
                rte_memcpy(new_ptr, prev_ptr, ACC100_5GUL_SIZE_0);
                rte_memcpy(new_ptr + ACC100_5GUL_OFFSET_0,
                                prev_ptr + ACC100_5GUL_OFFSET_0,
                                ACC100_5GUL_SIZE_1);
                desc->req.op_addr = prev_desc->req.op_addr;
                /* Copy FCW */
                rte_memcpy(new_ptr + ACC100_DESC_FCW_OFFSET,
                                prev_ptr + ACC100_DESC_FCW_OFFSET,
                                ACC100_FCW_LD_BLEN);
                acc100_dma_desc_ld_update(op, &desc->req, input, h_output,
                                &in_offset, &h_out_offset,
                                &h_out_length, harq_layout);
        } else {
                struct acc100_fcw_ld *fcw;
                uint32_t seg_total_left;
                fcw = &desc->req.fcw_ld;
                acc100_fcw_ld_fill(op, fcw, harq_layout);

                /* Special handling when overusing mbuf */
                if (fcw->rm_e < ACC100_MAX_E_MBUF)
                        seg_total_left = rte_pktmbuf_data_len(input)
                                        - in_offset;
                else
                        seg_total_left = fcw->rm_e;

                ret = acc100_dma_desc_ld_fill(op, &desc->req, &input, h_output,
                                &in_offset, &h_out_offset,
                                &h_out_length, &mbuf_total_left,
                                &seg_total_left, fcw);
                if (unlikely(ret < 0))
                        return ret;
        }

        /* Hard output */
        mbuf_append(h_output_head, h_output, h_out_length);
#ifndef ACC100_EXT_MEM
        if (op->ldpc_dec.harq_combined_output.length > 0) {
                /* Push the HARQ output into host memory */
                struct rte_mbuf *hq_output_head, *hq_output;
                hq_output_head = op->ldpc_dec.harq_combined_output.data;
                hq_output = op->ldpc_dec.harq_combined_output.data;
                mbuf_append(hq_output_head, hq_output,
                                op->ldpc_dec.harq_combined_output.length);
        }
#endif

#ifdef RTE_LIBRTE_BBDEV_DEBUG
        rte_memdump(stderr, "FCW", &desc->req.fcw_ld,
                        sizeof(desc->req.fcw_ld) - 8);
        rte_memdump(stderr, "Req Desc.", desc, sizeof(*desc));
#endif

        /* One CB (one op) was successfully prepared to enqueue */
        return 1;