ixgbe: remove simple scalar scattered Rx method

[dpdk.git] / lib / librte_pmd_ixgbe / ixgbe_rxtx.c

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   Copyright 2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/queue.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <inttypes.h>

#include <rte_byteorder.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_interrupts.h>
#include <rte_pci.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_ring.h>
#include <rte_mempool.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_prefetch.h>
#include <rte_udp.h>
#include <rte_tcp.h>
#include <rte_sctp.h>
#include <rte_string_fns.h>
#include <rte_errno.h>
#include <rte_ip.h>

#include "ixgbe_logs.h"
#include "ixgbe/ixgbe_api.h"
#include "ixgbe/ixgbe_vf.h"
#include "ixgbe_ethdev.h"
#include "ixgbe/ixgbe_dcb.h"
#include "ixgbe/ixgbe_common.h"
#include "ixgbe_rxtx.h"

/* Bit Mask to indicate what bits required for building TX context */
#define IXGBE_TX_OFFLOAD_MASK (                  \
                PKT_TX_VLAN_PKT |                \
                PKT_TX_IP_CKSUM |                \
                PKT_TX_L4_MASK |                 \
                PKT_TX_TCP_SEG)

static inline struct rte_mbuf *
rte_rxmbuf_alloc(struct rte_mempool *mp)
{
        struct rte_mbuf *m;

        m = __rte_mbuf_raw_alloc(mp);
        __rte_mbuf_sanity_check_raw(m, 0);
        return (m);
}


#if 1
#define RTE_PMD_USE_PREFETCH
#endif

#ifdef RTE_PMD_USE_PREFETCH
/*
 * Prefetch a cache line into all cache levels.
 */
#define rte_ixgbe_prefetch(p)   rte_prefetch0(p)
#else
#define rte_ixgbe_prefetch(p)   do {} while(0)
#endif

/*********************************************************************
 *
 *  TX functions
 *
 **********************************************************************/

/*
 * Check for descriptors with their DD bit set and free mbufs.
 * Return the total number of buffers freed.
 */
static inline int __attribute__((always_inline))
ixgbe_tx_free_bufs(struct ixgbe_tx_queue *txq)
{
        struct ixgbe_tx_entry *txep;
        uint32_t status;
        int i;

        /* check DD bit on threshold descriptor */
        status = txq->tx_ring[txq->tx_next_dd].wb.status;
        if (! (status & IXGBE_ADVTXD_STAT_DD))
                return 0;

        /*
         * first buffer to free from S/W ring is at index
         * tx_next_dd - (tx_rs_thresh-1)
         */
        txep = &(txq->sw_ring[txq->tx_next_dd - (txq->tx_rs_thresh - 1)]);

        /* free buffers one at a time */
        if ((txq->txq_flags & (uint32_t)ETH_TXQ_FLAGS_NOREFCOUNT) != 0) {
                for (i = 0; i < txq->tx_rs_thresh; ++i, ++txep) {
                        txep->mbuf->next = NULL;
                        rte_mempool_put(txep->mbuf->pool, txep->mbuf);
                        txep->mbuf = NULL;
                }
        } else {
                for (i = 0; i < txq->tx_rs_thresh; ++i, ++txep) {
                        rte_pktmbuf_free_seg(txep->mbuf);
                        txep->mbuf = NULL;
                }
        }

        /* buffers were freed, update counters */
        txq->nb_tx_free = (uint16_t)(txq->nb_tx_free + txq->tx_rs_thresh);
        txq->tx_next_dd = (uint16_t)(txq->tx_next_dd + txq->tx_rs_thresh);
        if (txq->tx_next_dd >= txq->nb_tx_desc)
                txq->tx_next_dd = (uint16_t)(txq->tx_rs_thresh - 1);

        return txq->tx_rs_thresh;
}

/* Populate 4 descriptors with data from 4 mbufs */
static inline void
tx4(volatile union ixgbe_adv_tx_desc *txdp, struct rte_mbuf **pkts)
{
        uint64_t buf_dma_addr;
        uint32_t pkt_len;
        int i;

        for (i = 0; i < 4; ++i, ++txdp, ++pkts) {
                buf_dma_addr = RTE_MBUF_DATA_DMA_ADDR(*pkts);
                pkt_len = (*pkts)->data_len;

                /* write data to descriptor */
                txdp->read.buffer_addr = buf_dma_addr;
                txdp->read.cmd_type_len =
                                ((uint32_t)DCMD_DTYP_FLAGS | pkt_len);
                txdp->read.olinfo_status =
                                (pkt_len << IXGBE_ADVTXD_PAYLEN_SHIFT);
                rte_prefetch0(&(*pkts)->pool);
        }
}

/* Populate 1 descriptor with data from 1 mbuf */
static inline void
tx1(volatile union ixgbe_adv_tx_desc *txdp, struct rte_mbuf **pkts)
{
        uint64_t buf_dma_addr;
        uint32_t pkt_len;

        buf_dma_addr = RTE_MBUF_DATA_DMA_ADDR(*pkts);
        pkt_len = (*pkts)->data_len;

        /* write data to descriptor */
        txdp->read.buffer_addr = buf_dma_addr;
        txdp->read.cmd_type_len =
                        ((uint32_t)DCMD_DTYP_FLAGS | pkt_len);
        txdp->read.olinfo_status =
                        (pkt_len << IXGBE_ADVTXD_PAYLEN_SHIFT);
        rte_prefetch0(&(*pkts)->pool);
}

/*
 * Fill H/W descriptor ring with mbuf data.
 * Copy mbuf pointers to the S/W ring.
 */
static inline void
ixgbe_tx_fill_hw_ring(struct ixgbe_tx_queue *txq, struct rte_mbuf **pkts,
                      uint16_t nb_pkts)
{
        volatile union ixgbe_adv_tx_desc *txdp = &(txq->tx_ring[txq->tx_tail]);
        struct ixgbe_tx_entry *txep = &(txq->sw_ring[txq->tx_tail]);
        const int N_PER_LOOP = 4;
        const int N_PER_LOOP_MASK = N_PER_LOOP-1;
        int mainpart, leftover;
        int i, j;

        /*
         * Process most of the packets in chunks of N pkts.  Any
         * leftover packets will get processed one at a time.
         */
        mainpart = (nb_pkts & ((uint32_t) ~N_PER_LOOP_MASK));
        leftover = (nb_pkts & ((uint32_t)  N_PER_LOOP_MASK));
        for (i = 0; i < mainpart; i += N_PER_LOOP) {
                /* Copy N mbuf pointers to the S/W ring */
                for (j = 0; j < N_PER_LOOP; ++j) {
                        (txep + i + j)->mbuf = *(pkts + i + j);
                }
                tx4(txdp + i, pkts + i);
        }

        if (unlikely(leftover > 0)) {
                for (i = 0; i < leftover; ++i) {
                        (txep + mainpart + i)->mbuf = *(pkts + mainpart + i);
                        tx1(txdp + mainpart + i, pkts + mainpart + i);
                }
        }
}

static inline uint16_t
tx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
             uint16_t nb_pkts)
{
        struct ixgbe_tx_queue *txq = (struct ixgbe_tx_queue *)tx_queue;
        volatile union ixgbe_adv_tx_desc *tx_r = txq->tx_ring;
        uint16_t n = 0;

        /*
         * Begin scanning the H/W ring for done descriptors when the
         * number of available descriptors drops below tx_free_thresh.  For
         * each done descriptor, free the associated buffer.
         */
        if (txq->nb_tx_free < txq->tx_free_thresh)
                ixgbe_tx_free_bufs(txq);

        /* Only use descriptors that are available */
        nb_pkts = (uint16_t)RTE_MIN(txq->nb_tx_free, nb_pkts);
        if (unlikely(nb_pkts == 0))
                return 0;

        /* Use exactly nb_pkts descriptors */
        txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_pkts);

        /*
         * At this point, we know there are enough descriptors in the
         * ring to transmit all the packets.  This assumes that each
         * mbuf contains a single segment, and that no new offloads
         * are expected, which would require a new context descriptor.
         */

        /*
         * See if we're going to wrap-around. If so, handle the top
         * of the descriptor ring first, then do the bottom.  If not,
         * the processing looks just like the "bottom" part anyway...
         */
        if ((txq->tx_tail + nb_pkts) > txq->nb_tx_desc) {
                n = (uint16_t)(txq->nb_tx_desc - txq->tx_tail);
                ixgbe_tx_fill_hw_ring(txq, tx_pkts, n);

                /*
                 * We know that the last descriptor in the ring will need to
                 * have its RS bit set because tx_rs_thresh has to be
                 * a divisor of the ring size
                 */
                tx_r[txq->tx_next_rs].read.cmd_type_len |=
                        rte_cpu_to_le_32(IXGBE_ADVTXD_DCMD_RS);
                txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);

                txq->tx_tail = 0;
        }

        /* Fill H/W descriptor ring with mbuf data */
        ixgbe_tx_fill_hw_ring(txq, tx_pkts + n, (uint16_t)(nb_pkts - n));
        txq->tx_tail = (uint16_t)(txq->tx_tail + (nb_pkts - n));

        /*
         * Determine if RS bit should be set
         * This is what we actually want:
         *   if ((txq->tx_tail - 1) >= txq->tx_next_rs)
         * but instead of subtracting 1 and doing >=, we can just do
         * greater than without subtracting.
         */
        if (txq->tx_tail > txq->tx_next_rs) {
                tx_r[txq->tx_next_rs].read.cmd_type_len |=
                        rte_cpu_to_le_32(IXGBE_ADVTXD_DCMD_RS);
                txq->tx_next_rs = (uint16_t)(txq->tx_next_rs +
                                                txq->tx_rs_thresh);
                if (txq->tx_next_rs >= txq->nb_tx_desc)
                        txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);
        }

        /*
         * Check for wrap-around. This would only happen if we used
         * up to the last descriptor in the ring, no more, no less.
         */
        if (txq->tx_tail >= txq->nb_tx_desc)
                txq->tx_tail = 0;

        /* update tail pointer */
        rte_wmb();
        IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, txq->tx_tail);

        return nb_pkts;
}

uint16_t
ixgbe_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
                       uint16_t nb_pkts)
{
        uint16_t nb_tx;

        /* Try to transmit at least chunks of TX_MAX_BURST pkts */
        if (likely(nb_pkts <= RTE_PMD_IXGBE_TX_MAX_BURST))
                return tx_xmit_pkts(tx_queue, tx_pkts, nb_pkts);

        /* transmit more than the max burst, in chunks of TX_MAX_BURST */
        nb_tx = 0;
        while (nb_pkts) {
                uint16_t ret, n;
                n = (uint16_t)RTE_MIN(nb_pkts, RTE_PMD_IXGBE_TX_MAX_BURST);
                ret = tx_xmit_pkts(tx_queue, &(tx_pkts[nb_tx]), n);
                nb_tx = (uint16_t)(nb_tx + ret);
                nb_pkts = (uint16_t)(nb_pkts - ret);
                if (ret < n)
                        break;
        }

        return nb_tx;
}

static inline void
ixgbe_set_xmit_ctx(struct ixgbe_tx_queue *txq,
                volatile struct ixgbe_adv_tx_context_desc *ctx_txd,
                uint64_t ol_flags, union ixgbe_tx_offload tx_offload)
{
        uint32_t type_tucmd_mlhl;
        uint32_t mss_l4len_idx = 0;
        uint32_t ctx_idx;
        uint32_t vlan_macip_lens;
        union ixgbe_tx_offload tx_offload_mask;

        ctx_idx = txq->ctx_curr;
        tx_offload_mask.data = 0;
        type_tucmd_mlhl = 0;

        /* Specify which HW CTX to upload. */
        mss_l4len_idx |= (ctx_idx << IXGBE_ADVTXD_IDX_SHIFT);

        if (ol_flags & PKT_TX_VLAN_PKT) {
                tx_offload_mask.vlan_tci |= ~0;
        }

        /* check if TCP segmentation required for this packet */
        if (ol_flags & PKT_TX_TCP_SEG) {
                /* implies IP cksum and TCP cksum */
                type_tucmd_mlhl = IXGBE_ADVTXD_TUCMD_IPV4 |
                        IXGBE_ADVTXD_TUCMD_L4T_TCP |
                        IXGBE_ADVTXD_DTYP_CTXT | IXGBE_ADVTXD_DCMD_DEXT;

                tx_offload_mask.l2_len |= ~0;
                tx_offload_mask.l3_len |= ~0;
                tx_offload_mask.l4_len |= ~0;
                tx_offload_mask.tso_segsz |= ~0;
                mss_l4len_idx |= tx_offload.tso_segsz << IXGBE_ADVTXD_MSS_SHIFT;
                mss_l4len_idx |= tx_offload.l4_len << IXGBE_ADVTXD_L4LEN_SHIFT;
        } else { /* no TSO, check if hardware checksum is needed */
                if (ol_flags & PKT_TX_IP_CKSUM) {
                        type_tucmd_mlhl = IXGBE_ADVTXD_TUCMD_IPV4;
                        tx_offload_mask.l2_len |= ~0;
                        tx_offload_mask.l3_len |= ~0;
                }

                switch (ol_flags & PKT_TX_L4_MASK) {
                case PKT_TX_UDP_CKSUM:
                        type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_UDP |
                                IXGBE_ADVTXD_DTYP_CTXT | IXGBE_ADVTXD_DCMD_DEXT;
                        mss_l4len_idx |= sizeof(struct udp_hdr) << IXGBE_ADVTXD_L4LEN_SHIFT;
                        tx_offload_mask.l2_len |= ~0;
                        tx_offload_mask.l3_len |= ~0;
                        break;
                case PKT_TX_TCP_CKSUM:
                        type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_TCP |
                                IXGBE_ADVTXD_DTYP_CTXT | IXGBE_ADVTXD_DCMD_DEXT;
                        mss_l4len_idx |= sizeof(struct tcp_hdr) << IXGBE_ADVTXD_L4LEN_SHIFT;
                        tx_offload_mask.l2_len |= ~0;
                        tx_offload_mask.l3_len |= ~0;
                        tx_offload_mask.l4_len |= ~0;
                        break;
                case PKT_TX_SCTP_CKSUM:
                        type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_SCTP |
                                IXGBE_ADVTXD_DTYP_CTXT | IXGBE_ADVTXD_DCMD_DEXT;
                        mss_l4len_idx |= sizeof(struct sctp_hdr) << IXGBE_ADVTXD_L4LEN_SHIFT;
                        tx_offload_mask.l2_len |= ~0;
                        tx_offload_mask.l3_len |= ~0;
                        break;
                default:
                        type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_RSV |
                                IXGBE_ADVTXD_DTYP_CTXT | IXGBE_ADVTXD_DCMD_DEXT;
                        break;
                }
        }

        txq->ctx_cache[ctx_idx].flags = ol_flags;
        txq->ctx_cache[ctx_idx].tx_offload.data  =
                tx_offload_mask.data & tx_offload.data;
        txq->ctx_cache[ctx_idx].tx_offload_mask    = tx_offload_mask;

        ctx_txd->type_tucmd_mlhl = rte_cpu_to_le_32(type_tucmd_mlhl);
        vlan_macip_lens = tx_offload.l3_len;
        vlan_macip_lens |= (tx_offload.l2_len << IXGBE_ADVTXD_MACLEN_SHIFT);
        vlan_macip_lens |= ((uint32_t)tx_offload.vlan_tci << IXGBE_ADVTXD_VLAN_SHIFT);
        ctx_txd->vlan_macip_lens = rte_cpu_to_le_32(vlan_macip_lens);
        ctx_txd->mss_l4len_idx   = rte_cpu_to_le_32(mss_l4len_idx);
        ctx_txd->seqnum_seed     = 0;
}

/*
 * Check which hardware context can be used. Use the existing match
 * or create a new context descriptor.
 */
static inline uint32_t
what_advctx_update(struct ixgbe_tx_queue *txq, uint64_t flags,
                union ixgbe_tx_offload tx_offload)
{
        /* If match with the current used context */
        if (likely((txq->ctx_cache[txq->ctx_curr].flags == flags) &&
                (txq->ctx_cache[txq->ctx_curr].tx_offload.data ==
                (txq->ctx_cache[txq->ctx_curr].tx_offload_mask.data & tx_offload.data)))) {
                        return txq->ctx_curr;
        }

        /* What if match with the next context  */
        txq->ctx_curr ^= 1;
        if (likely((txq->ctx_cache[txq->ctx_curr].flags == flags) &&
                (txq->ctx_cache[txq->ctx_curr].tx_offload.data ==
                (txq->ctx_cache[txq->ctx_curr].tx_offload_mask.data & tx_offload.data)))) {
                        return txq->ctx_curr;
        }

        /* Mismatch, use the previous context */
        return (IXGBE_CTX_NUM);
}

static inline uint32_t
tx_desc_cksum_flags_to_olinfo(uint64_t ol_flags)
{
        uint32_t tmp = 0;
        if ((ol_flags & PKT_TX_L4_MASK) != PKT_TX_L4_NO_CKSUM)
                tmp |= IXGBE_ADVTXD_POPTS_TXSM;
        if (ol_flags & PKT_TX_IP_CKSUM)
                tmp |= IXGBE_ADVTXD_POPTS_IXSM;
        if (ol_flags & PKT_TX_TCP_SEG)
                tmp |= IXGBE_ADVTXD_POPTS_TXSM;
        return tmp;
}

static inline uint32_t
tx_desc_ol_flags_to_cmdtype(uint64_t ol_flags)
{
        uint32_t cmdtype = 0;
        if (ol_flags & PKT_TX_VLAN_PKT)
                cmdtype |= IXGBE_ADVTXD_DCMD_VLE;
        if (ol_flags & PKT_TX_TCP_SEG)
                cmdtype |= IXGBE_ADVTXD_DCMD_TSE;
        return cmdtype;
}

/* Default RS bit threshold values */
#ifndef DEFAULT_TX_RS_THRESH
#define DEFAULT_TX_RS_THRESH   32
#endif
#ifndef DEFAULT_TX_FREE_THRESH
#define DEFAULT_TX_FREE_THRESH 32
#endif

/* Reset transmit descriptors after they have been used */
static inline int
ixgbe_xmit_cleanup(struct ixgbe_tx_queue *txq)
{
        struct ixgbe_tx_entry *sw_ring = txq->sw_ring;
        volatile union ixgbe_adv_tx_desc *txr = txq->tx_ring;
        uint16_t last_desc_cleaned = txq->last_desc_cleaned;
        uint16_t nb_tx_desc = txq->nb_tx_desc;
        uint16_t desc_to_clean_to;
        uint16_t nb_tx_to_clean;

        /* Determine the last descriptor needing to be cleaned */
        desc_to_clean_to = (uint16_t)(last_desc_cleaned + txq->tx_rs_thresh);
        if (desc_to_clean_to >= nb_tx_desc)
                desc_to_clean_to = (uint16_t)(desc_to_clean_to - nb_tx_desc);

        /* Check to make sure the last descriptor to clean is done */
        desc_to_clean_to = sw_ring[desc_to_clean_to].last_id;
        if (! (txr[desc_to_clean_to].wb.status & IXGBE_TXD_STAT_DD))
        {
                PMD_TX_FREE_LOG(DEBUG,
                                "TX descriptor %4u is not done"
                                "(port=%d queue=%d)",
                                desc_to_clean_to,
                                txq->port_id, txq->queue_id);
                /* Failed to clean any descriptors, better luck next time */
                return -(1);
        }

        /* Figure out how many descriptors will be cleaned */
        if (last_desc_cleaned > desc_to_clean_to)
                nb_tx_to_clean = (uint16_t)((nb_tx_desc - last_desc_cleaned) +
                                                        desc_to_clean_to);
        else
                nb_tx_to_clean = (uint16_t)(desc_to_clean_to -
                                                last_desc_cleaned);

        PMD_TX_FREE_LOG(DEBUG,
                        "Cleaning %4u TX descriptors: %4u to %4u "
                        "(port=%d queue=%d)",
                        nb_tx_to_clean, last_desc_cleaned, desc_to_clean_to,
                        txq->port_id, txq->queue_id);

        /*
         * The last descriptor to clean is done, so that means all the
         * descriptors from the last descriptor that was cleaned
         * up to the last descriptor with the RS bit set
         * are done. Only reset the threshold descriptor.
         */
        txr[desc_to_clean_to].wb.status = 0;

        /* Update the txq to reflect the last descriptor that was cleaned */
        txq->last_desc_cleaned = desc_to_clean_to;
        txq->nb_tx_free = (uint16_t)(txq->nb_tx_free + nb_tx_to_clean);

        /* No Error */
        return (0);
}

uint16_t
ixgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
                uint16_t nb_pkts)
{
        struct ixgbe_tx_queue *txq;
        struct ixgbe_tx_entry *sw_ring;
        struct ixgbe_tx_entry *txe, *txn;
        volatile union ixgbe_adv_tx_desc *txr;
        volatile union ixgbe_adv_tx_desc *txd;
        struct rte_mbuf     *tx_pkt;
        struct rte_mbuf     *m_seg;
        uint64_t buf_dma_addr;
        uint32_t olinfo_status;
        uint32_t cmd_type_len;
        uint32_t pkt_len;
        uint16_t slen;
        uint64_t ol_flags;
        uint16_t tx_id;
        uint16_t tx_last;
        uint16_t nb_tx;
        uint16_t nb_used;
        uint64_t tx_ol_req;
        uint32_t ctx = 0;
        uint32_t new_ctx;
        union ixgbe_tx_offload tx_offload = {0};

        txq = tx_queue;
        sw_ring = txq->sw_ring;
        txr     = txq->tx_ring;
        tx_id   = txq->tx_tail;
        txe = &sw_ring[tx_id];

        /* Determine if the descriptor ring needs to be cleaned. */
        if ((txq->nb_tx_desc - txq->nb_tx_free) > txq->tx_free_thresh) {
                ixgbe_xmit_cleanup(txq);
        }

        rte_prefetch0(&txe->mbuf->pool);

        /* TX loop */
        for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
                new_ctx = 0;
                tx_pkt = *tx_pkts++;
                pkt_len = tx_pkt->pkt_len;

                /*
                 * Determine how many (if any) context descriptors
                 * are needed for offload functionality.
                 */
                ol_flags = tx_pkt->ol_flags;

                /* If hardware offload required */
                tx_ol_req = ol_flags & IXGBE_TX_OFFLOAD_MASK;
                if (tx_ol_req) {
                        tx_offload.l2_len = tx_pkt->l2_len;
                        tx_offload.l3_len = tx_pkt->l3_len;
                        tx_offload.l4_len = tx_pkt->l4_len;
                        tx_offload.vlan_tci = tx_pkt->vlan_tci;
                        tx_offload.tso_segsz = tx_pkt->tso_segsz;

                        /* If new context need be built or reuse the exist ctx. */
                        ctx = what_advctx_update(txq, tx_ol_req,
                                tx_offload);
                        /* Only allocate context descriptor if required*/
                        new_ctx = (ctx == IXGBE_CTX_NUM);
                        ctx = txq->ctx_curr;
                }

                /*
                 * Keep track of how many descriptors are used this loop
                 * This will always be the number of segments + the number of
                 * Context descriptors required to transmit the packet
                 */
                nb_used = (uint16_t)(tx_pkt->nb_segs + new_ctx);

                /*
                 * The number of descriptors that must be allocated for a
                 * packet is the number of segments of that packet, plus 1
                 * Context Descriptor for the hardware offload, if any.
                 * Determine the last TX descriptor to allocate in the TX ring
                 * for the packet, starting from the current position (tx_id)
                 * in the ring.
                 */
                tx_last = (uint16_t) (tx_id + nb_used - 1);

                /* Circular ring */
                if (tx_last >= txq->nb_tx_desc)
                        tx_last = (uint16_t) (tx_last - txq->nb_tx_desc);

                PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u pktlen=%u"
                           " tx_first=%u tx_last=%u",
                           (unsigned) txq->port_id,
                           (unsigned) txq->queue_id,
                           (unsigned) pkt_len,
                           (unsigned) tx_id,
                           (unsigned) tx_last);

                /*
                 * Make sure there are enough TX descriptors available to
                 * transmit the entire packet.
                 * nb_used better be less than or equal to txq->tx_rs_thresh
                 */
                if (nb_used > txq->nb_tx_free) {
                        PMD_TX_FREE_LOG(DEBUG,
                                        "Not enough free TX descriptors "
                                        "nb_used=%4u nb_free=%4u "
                                        "(port=%d queue=%d)",
                                        nb_used, txq->nb_tx_free,
                                        txq->port_id, txq->queue_id);

                        if (ixgbe_xmit_cleanup(txq) != 0) {
                                /* Could not clean any descriptors */
                                if (nb_tx == 0)
                                        return (0);
                                goto end_of_tx;
                        }

                        /* nb_used better be <= txq->tx_rs_thresh */
                        if (unlikely(nb_used > txq->tx_rs_thresh)) {
                                PMD_TX_FREE_LOG(DEBUG,
                                        "The number of descriptors needed to "
                                        "transmit the packet exceeds the "
                                        "RS bit threshold. This will impact "
                                        "performance."
                                        "nb_used=%4u nb_free=%4u "
                                        "tx_rs_thresh=%4u. "
                                        "(port=%d queue=%d)",
                                        nb_used, txq->nb_tx_free,
                                        txq->tx_rs_thresh,
                                        txq->port_id, txq->queue_id);
                                /*
                                 * Loop here until there are enough TX
                                 * descriptors or until the ring cannot be
                                 * cleaned.
                                 */
                                while (nb_used > txq->nb_tx_free) {
                                        if (ixgbe_xmit_cleanup(txq) != 0) {
                                                /*
                                                 * Could not clean any
                                                 * descriptors
                                                 */
                                                if (nb_tx == 0)
                                                        return (0);
                                                goto end_of_tx;
                                        }
                                }
                        }
                }

                /*
                 * By now there are enough free TX descriptors to transmit
                 * the packet.
                 */

                /*
                 * Set common flags of all TX Data Descriptors.
                 *
                 * The following bits must be set in all Data Descriptors:
                 *   - IXGBE_ADVTXD_DTYP_DATA
                 *   - IXGBE_ADVTXD_DCMD_DEXT
                 *
                 * The following bits must be set in the first Data Descriptor
                 * and are ignored in the other ones:
                 *   - IXGBE_ADVTXD_DCMD_IFCS
                 *   - IXGBE_ADVTXD_MAC_1588
                 *   - IXGBE_ADVTXD_DCMD_VLE
                 *
                 * The following bits must only be set in the last Data
                 * Descriptor:
                 *   - IXGBE_TXD_CMD_EOP
                 *
                 * The following bits can be set in any Data Descriptor, but
                 * are only set in the last Data Descriptor:
                 *   - IXGBE_TXD_CMD_RS
                 */
                cmd_type_len = IXGBE_ADVTXD_DTYP_DATA |
                        IXGBE_ADVTXD_DCMD_IFCS | IXGBE_ADVTXD_DCMD_DEXT;

#ifdef RTE_LIBRTE_IEEE1588
                if (ol_flags & PKT_TX_IEEE1588_TMST)
                        cmd_type_len |= IXGBE_ADVTXD_MAC_1588;
#endif

                olinfo_status = 0;
                if (tx_ol_req) {

                        if (ol_flags & PKT_TX_TCP_SEG) {
                                /* when TSO is on, paylen in descriptor is the
                                 * not the packet len but the tcp payload len */
                                pkt_len -= (tx_offload.l2_len +
                                        tx_offload.l3_len + tx_offload.l4_len);
                        }

                        /*
                         * Setup the TX Advanced Context Descriptor if required
                         */
                        if (new_ctx) {
                                volatile struct ixgbe_adv_tx_context_desc *
                                    ctx_txd;

                                ctx_txd = (volatile struct
                                    ixgbe_adv_tx_context_desc *)
                                    &txr[tx_id];

                                txn = &sw_ring[txe->next_id];
                                rte_prefetch0(&txn->mbuf->pool);

                                if (txe->mbuf != NULL) {
                                        rte_pktmbuf_free_seg(txe->mbuf);
                                        txe->mbuf = NULL;
                                }

                                ixgbe_set_xmit_ctx(txq, ctx_txd, tx_ol_req,
                                        tx_offload);

                                txe->last_id = tx_last;
                                tx_id = txe->next_id;
                                txe = txn;
                        }

                        /*
                         * Setup the TX Advanced Data Descriptor,
                         * This path will go through
                         * whatever new/reuse the context descriptor
                         */
                        cmd_type_len  |= tx_desc_ol_flags_to_cmdtype(ol_flags);
                        olinfo_status |= tx_desc_cksum_flags_to_olinfo(ol_flags);
                        olinfo_status |= ctx << IXGBE_ADVTXD_IDX_SHIFT;
                }

                olinfo_status |= (pkt_len << IXGBE_ADVTXD_PAYLEN_SHIFT);

                m_seg = tx_pkt;
                do {
                        txd = &txr[tx_id];
                        txn = &sw_ring[txe->next_id];
                        rte_prefetch0(&txn->mbuf->pool);

                        if (txe->mbuf != NULL)
                                rte_pktmbuf_free_seg(txe->mbuf);
                        txe->mbuf = m_seg;

                        /*
                         * Set up Transmit Data Descriptor.
                         */
                        slen = m_seg->data_len;
                        buf_dma_addr = RTE_MBUF_DATA_DMA_ADDR(m_seg);
                        txd->read.buffer_addr =
                                rte_cpu_to_le_64(buf_dma_addr);
                        txd->read.cmd_type_len =
                                rte_cpu_to_le_32(cmd_type_len | slen);
                        txd->read.olinfo_status =
                                rte_cpu_to_le_32(olinfo_status);
                        txe->last_id = tx_last;
                        tx_id = txe->next_id;
                        txe = txn;
                        m_seg = m_seg->next;
                } while (m_seg != NULL);

                /*
                 * The last packet data descriptor needs End Of Packet (EOP)
                 */
                cmd_type_len |= IXGBE_TXD_CMD_EOP;
                txq->nb_tx_used = (uint16_t)(txq->nb_tx_used + nb_used);
                txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_used);

                /* Set RS bit only on threshold packets' last descriptor */
                if (txq->nb_tx_used >= txq->tx_rs_thresh) {
                        PMD_TX_FREE_LOG(DEBUG,
                                        "Setting RS bit on TXD id="
                                        "%4u (port=%d queue=%d)",
                                        tx_last, txq->port_id, txq->queue_id);

                        cmd_type_len |= IXGBE_TXD_CMD_RS;

                        /* Update txq RS bit counters */
                        txq->nb_tx_used = 0;
                }
                txd->read.cmd_type_len |= rte_cpu_to_le_32(cmd_type_len);
        }
end_of_tx:
        rte_wmb();

        /*
         * Set the Transmit Descriptor Tail (TDT)
         */
        PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u tx_tail=%u nb_tx=%u",
                   (unsigned) txq->port_id, (unsigned) txq->queue_id,
                   (unsigned) tx_id, (unsigned) nb_tx);
        IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, tx_id);
        txq->tx_tail = tx_id;

        return (nb_tx);
}

/*********************************************************************
 *
 *  RX functions
 *
 **********************************************************************/
static inline uint64_t
rx_desc_hlen_type_rss_to_pkt_flags(uint32_t hl_tp_rs)
{
        uint64_t pkt_flags;

        static const uint64_t ip_pkt_types_map[16] = {
                0, PKT_RX_IPV4_HDR, PKT_RX_IPV4_HDR_EXT, PKT_RX_IPV4_HDR_EXT,
                PKT_RX_IPV6_HDR, 0, 0, 0,
                PKT_RX_IPV6_HDR_EXT, 0, 0, 0,
                PKT_RX_IPV6_HDR_EXT, 0, 0, 0,
        };

        static const uint64_t ip_rss_types_map[16] = {
                0, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
                0, PKT_RX_RSS_HASH, 0, PKT_RX_RSS_HASH,
                PKT_RX_RSS_HASH, 0, 0, 0,
                0, 0, 0,  PKT_RX_FDIR,
        };

#ifdef RTE_LIBRTE_IEEE1588
        static uint64_t ip_pkt_etqf_map[8] = {
                0, 0, 0, PKT_RX_IEEE1588_PTP,
                0, 0, 0, 0,
        };

        pkt_flags = (hl_tp_rs & IXGBE_RXDADV_PKTTYPE_ETQF) ?
                        ip_pkt_etqf_map[(hl_tp_rs >> 4) & 0x07] :
                        ip_pkt_types_map[(hl_tp_rs >> 4) & 0x0F];
#else
        pkt_flags = (hl_tp_rs & IXGBE_RXDADV_PKTTYPE_ETQF) ? 0 :
                        ip_pkt_types_map[(hl_tp_rs >> 4) & 0x0F];

#endif
        return pkt_flags | ip_rss_types_map[hl_tp_rs & 0xF];
}

static inline uint64_t
rx_desc_status_to_pkt_flags(uint32_t rx_status)
{
        uint64_t pkt_flags;

        /*
         * Check if VLAN present only.
         * Do not check whether L3/L4 rx checksum done by NIC or not,
         * That can be found from rte_eth_rxmode.hw_ip_checksum flag
         */
        pkt_flags = (rx_status & IXGBE_RXD_STAT_VP) ?  PKT_RX_VLAN_PKT : 0;

#ifdef RTE_LIBRTE_IEEE1588
        if (rx_status & IXGBE_RXD_STAT_TMST)
                pkt_flags = pkt_flags | PKT_RX_IEEE1588_TMST;
#endif
        return pkt_flags;
}

static inline uint64_t
rx_desc_error_to_pkt_flags(uint32_t rx_status)
{
        /*
         * Bit 31: IPE, IPv4 checksum error
         * Bit 30: L4I, L4I integrity error
         */
        static uint64_t error_to_pkt_flags_map[4] = {
                0,  PKT_RX_L4_CKSUM_BAD, PKT_RX_IP_CKSUM_BAD,
                PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD
        };
        return error_to_pkt_flags_map[(rx_status >>
                IXGBE_RXDADV_ERR_CKSUM_BIT) & IXGBE_RXDADV_ERR_CKSUM_MSK];
}

#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
/*
 * LOOK_AHEAD defines how many desc statuses to check beyond the
 * current descriptor.
 * It must be a pound define for optimal performance.
 * Do not change the value of LOOK_AHEAD, as the ixgbe_rx_scan_hw_ring
 * function only works with LOOK_AHEAD=8.
 */
#define LOOK_AHEAD 8
#if (LOOK_AHEAD != 8)
#error "PMD IXGBE: LOOK_AHEAD must be 8\n"
#endif
static inline int
ixgbe_rx_scan_hw_ring(struct ixgbe_rx_queue *rxq)
{
        volatile union ixgbe_adv_rx_desc *rxdp;
        struct ixgbe_rx_entry *rxep;
        struct rte_mbuf *mb;
        uint16_t pkt_len;
        uint64_t pkt_flags;
        int s[LOOK_AHEAD], nb_dd;
        int i, j, nb_rx = 0;


        /* get references to current descriptor and S/W ring entry */
        rxdp = &rxq->rx_ring[rxq->rx_tail];
        rxep = &rxq->sw_ring[rxq->rx_tail];

        /* check to make sure there is at least 1 packet to receive */
        if (! (rxdp->wb.upper.status_error & IXGBE_RXDADV_STAT_DD))
                return 0;

        /*
         * Scan LOOK_AHEAD descriptors at a time to determine which descriptors
         * reference packets that are ready to be received.
         */
        for (i = 0; i < RTE_PMD_IXGBE_RX_MAX_BURST;
             i += LOOK_AHEAD, rxdp += LOOK_AHEAD, rxep += LOOK_AHEAD)
        {
                /* Read desc statuses backwards to avoid race condition */
                for (j = LOOK_AHEAD-1; j >= 0; --j)
                        s[j] = rxdp[j].wb.upper.status_error;

                /* Compute how many status bits were set */
                nb_dd = 0;
                for (j = 0; j < LOOK_AHEAD; ++j)
                        nb_dd += s[j] & IXGBE_RXDADV_STAT_DD;

                nb_rx += nb_dd;

                /* Translate descriptor info to mbuf format */
                for (j = 0; j < nb_dd; ++j) {
                        mb = rxep[j].mbuf;
                        pkt_len = (uint16_t)(rxdp[j].wb.upper.length - rxq->crc_len);
                        mb->data_len = pkt_len;
                        mb->pkt_len = pkt_len;
                        mb->vlan_tci = rxdp[j].wb.upper.vlan;
                        mb->vlan_tci = rte_le_to_cpu_16(rxdp[j].wb.upper.vlan);

                        /* convert descriptor fields to rte mbuf flags */
                        pkt_flags  = rx_desc_hlen_type_rss_to_pkt_flags(
                                        rxdp[j].wb.lower.lo_dword.data);
                        /* reuse status field from scan list */
                        pkt_flags |= rx_desc_status_to_pkt_flags(s[j]);
                        pkt_flags |= rx_desc_error_to_pkt_flags(s[j]);
                        mb->ol_flags = pkt_flags;

                        if (likely(pkt_flags & PKT_RX_RSS_HASH))
                                mb->hash.rss = rxdp[j].wb.lower.hi_dword.rss;
                        else if (pkt_flags & PKT_RX_FDIR) {
                                mb->hash.fdir.hash =
                                        (uint16_t)((rxdp[j].wb.lower.hi_dword.csum_ip.csum)
                                                & IXGBE_ATR_HASH_MASK);
                                mb->hash.fdir.id = rxdp[j].wb.lower.hi_dword.csum_ip.ip_id;
                        }
                }

                /* Move mbuf pointers from the S/W ring to the stage */
                for (j = 0; j < LOOK_AHEAD; ++j) {
                        rxq->rx_stage[i + j] = rxep[j].mbuf;
                }

                /* stop if all requested packets could not be received */
                if (nb_dd != LOOK_AHEAD)
                        break;
        }

        /* clear software ring entries so we can cleanup correctly */
        for (i = 0; i < nb_rx; ++i) {
                rxq->sw_ring[rxq->rx_tail + i].mbuf = NULL;
        }


        return nb_rx;
}

static inline int
ixgbe_rx_alloc_bufs(struct ixgbe_rx_queue *rxq, bool reset_mbuf)
{
        volatile union ixgbe_adv_rx_desc *rxdp;
        struct ixgbe_rx_entry *rxep;
        struct rte_mbuf *mb;
        uint16_t alloc_idx;
        __le64 dma_addr;
        int diag, i;

        /* allocate buffers in bulk directly into the S/W ring */
        alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
        rxep = &rxq->sw_ring[alloc_idx];
        diag = rte_mempool_get_bulk(rxq->mb_pool, (void *)rxep,
                                    rxq->rx_free_thresh);
        if (unlikely(diag != 0))
                return (-ENOMEM);

        rxdp = &rxq->rx_ring[alloc_idx];
        for (i = 0; i < rxq->rx_free_thresh; ++i) {
                /* populate the static rte mbuf fields */
                mb = rxep[i].mbuf;
                if (reset_mbuf) {
                        mb->next = NULL;
                        mb->nb_segs = 1;
                        mb->port = rxq->port_id;
                }

                rte_mbuf_refcnt_set(mb, 1);
                mb->data_off = RTE_PKTMBUF_HEADROOM;

                /* populate the descriptors */
                dma_addr = rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mb));
                rxdp[i].read.hdr_addr = dma_addr;
                rxdp[i].read.pkt_addr = dma_addr;
        }

        /* update state of internal queue structure */
        rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
        if (rxq->rx_free_trigger >= rxq->nb_rx_desc)
                rxq->rx_free_trigger = rxq->rx_free_thresh - 1;

        /* no errors */
        return 0;
}

static inline uint16_t
ixgbe_rx_fill_from_stage(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
                         uint16_t nb_pkts)
{
        struct rte_mbuf **stage = &rxq->rx_stage[rxq->rx_next_avail];
        int i;

        /* how many packets are ready to return? */
        nb_pkts = (uint16_t)RTE_MIN(nb_pkts, rxq->rx_nb_avail);

        /* copy mbuf pointers to the application's packet list */
        for (i = 0; i < nb_pkts; ++i)
                rx_pkts[i] = stage[i];

        /* update internal queue state */
        rxq->rx_nb_avail = (uint16_t)(rxq->rx_nb_avail - nb_pkts);
        rxq->rx_next_avail = (uint16_t)(rxq->rx_next_avail + nb_pkts);

        return nb_pkts;
}

static inline uint16_t
rx_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
             uint16_t nb_pkts)
{
        struct ixgbe_rx_queue *rxq = (struct ixgbe_rx_queue *)rx_queue;
        uint16_t nb_rx = 0;

        /* Any previously recv'd pkts will be returned from the Rx stage */
        if (rxq->rx_nb_avail)
                return ixgbe_rx_fill_from_stage(rxq, rx_pkts, nb_pkts);

        /* Scan the H/W ring for packets to receive */
        nb_rx = (uint16_t)ixgbe_rx_scan_hw_ring(rxq);

        /* update internal queue state */
        rxq->rx_next_avail = 0;
        rxq->rx_nb_avail = nb_rx;
        rxq->rx_tail = (uint16_t)(rxq->rx_tail + nb_rx);

        /* if required, allocate new buffers to replenish descriptors */
        if (rxq->rx_tail > rxq->rx_free_trigger) {
                uint16_t cur_free_trigger = rxq->rx_free_trigger;

                if (ixgbe_rx_alloc_bufs(rxq, true) != 0) {
                        int i, j;
                        PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
                                   "queue_id=%u", (unsigned) rxq->port_id,
                                   (unsigned) rxq->queue_id);

                        rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed +=
                                rxq->rx_free_thresh;

                        /*
                         * Need to rewind any previous receives if we cannot
                         * allocate new buffers to replenish the old ones.
                         */
                        rxq->rx_nb_avail = 0;
                        rxq->rx_tail = (uint16_t)(rxq->rx_tail - nb_rx);
                        for (i = 0, j = rxq->rx_tail; i < nb_rx; ++i, ++j)
                                rxq->sw_ring[j].mbuf = rxq->rx_stage[i];

                        return 0;
                }

                /* update tail pointer */
                rte_wmb();
                IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, cur_free_trigger);
        }

        if (rxq->rx_tail >= rxq->nb_rx_desc)
                rxq->rx_tail = 0;

        /* received any packets this loop? */
        if (rxq->rx_nb_avail)
                return ixgbe_rx_fill_from_stage(rxq, rx_pkts, nb_pkts);

        return 0;
}

/* split requests into chunks of size RTE_PMD_IXGBE_RX_MAX_BURST */
static uint16_t
ixgbe_recv_pkts_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
                           uint16_t nb_pkts)
{
        uint16_t nb_rx;

        if (unlikely(nb_pkts == 0))
                return 0;

        if (likely(nb_pkts <= RTE_PMD_IXGBE_RX_MAX_BURST))
                return rx_recv_pkts(rx_queue, rx_pkts, nb_pkts);

        /* request is relatively large, chunk it up */
        nb_rx = 0;
        while (nb_pkts) {
                uint16_t ret, n;
                n = (uint16_t)RTE_MIN(nb_pkts, RTE_PMD_IXGBE_RX_MAX_BURST);
                ret = rx_recv_pkts(rx_queue, &rx_pkts[nb_rx], n);
                nb_rx = (uint16_t)(nb_rx + ret);
                nb_pkts = (uint16_t)(nb_pkts - ret);
                if (ret < n)
                        break;
        }

        return nb_rx;
}

#else

/* Stub to avoid extra ifdefs */
static uint16_t
ixgbe_recv_pkts_bulk_alloc(__rte_unused void *rx_queue,
        __rte_unused struct rte_mbuf **rx_pkts, __rte_unused uint16_t nb_pkts)
{
        return 0;
}

static inline int
ixgbe_rx_alloc_bufs(__rte_unused struct ixgbe_rx_queue *rxq,
                    __rte_unused bool reset_mbuf)
{
        return -ENOMEM;
}
#endif /* RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC */

uint16_t
ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
                uint16_t nb_pkts)
{
        struct ixgbe_rx_queue *rxq;
        volatile union ixgbe_adv_rx_desc *rx_ring;
        volatile union ixgbe_adv_rx_desc *rxdp;
        struct ixgbe_rx_entry *sw_ring;
        struct ixgbe_rx_entry *rxe;
        struct rte_mbuf *rxm;
        struct rte_mbuf *nmb;
        union ixgbe_adv_rx_desc rxd;
        uint64_t dma_addr;
        uint32_t staterr;
        uint32_t hlen_type_rss;
        uint16_t pkt_len;
        uint16_t rx_id;
        uint16_t nb_rx;
        uint16_t nb_hold;
        uint64_t pkt_flags;

        nb_rx = 0;
        nb_hold = 0;
        rxq = rx_queue;
        rx_id = rxq->rx_tail;
        rx_ring = rxq->rx_ring;
        sw_ring = rxq->sw_ring;
        while (nb_rx < nb_pkts) {
                /*
                 * The order of operations here is important as the DD status
                 * bit must not be read after any other descriptor fields.
                 * rx_ring and rxdp are pointing to volatile data so the order
                 * of accesses cannot be reordered by the compiler. If they were
                 * not volatile, they could be reordered which could lead to
                 * using invalid descriptor fields when read from rxd.
                 */
                rxdp = &rx_ring[rx_id];
                staterr = rxdp->wb.upper.status_error;
                if (! (staterr & rte_cpu_to_le_32(IXGBE_RXDADV_STAT_DD)))
                        break;
                rxd = *rxdp;

                /*
                 * End of packet.
                 *
                 * If the IXGBE_RXDADV_STAT_EOP flag is not set, the RX packet
                 * is likely to be invalid and to be dropped by the various
                 * validation checks performed by the network stack.
                 *
                 * Allocate a new mbuf to replenish the RX ring descriptor.
                 * If the allocation fails:
                 *    - arrange for that RX descriptor to be the first one
                 *      being parsed the next time the receive function is
                 *      invoked [on the same queue].
                 *
                 *    - Stop parsing the RX ring and return immediately.
                 *
                 * This policy do not drop the packet received in the RX
                 * descriptor for which the allocation of a new mbuf failed.
                 * Thus, it allows that packet to be later retrieved if
                 * mbuf have been freed in the mean time.
                 * As a side effect, holding RX descriptors instead of
                 * systematically giving them back to the NIC may lead to
                 * RX ring exhaustion situations.
                 * However, the NIC can gracefully prevent such situations
                 * to happen by sending specific "back-pressure" flow control
                 * frames to its peer(s).
                 */
                PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u "
                           "ext_err_stat=0x%08x pkt_len=%u",
                           (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
                           (unsigned) rx_id, (unsigned) staterr,
                           (unsigned) rte_le_to_cpu_16(rxd.wb.upper.length));

                nmb = rte_rxmbuf_alloc(rxq->mb_pool);
                if (nmb == NULL) {
                        PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
                                   "queue_id=%u", (unsigned) rxq->port_id,
                                   (unsigned) rxq->queue_id);
                        rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
                        break;
                }

                nb_hold++;
                rxe = &sw_ring[rx_id];
                rx_id++;
                if (rx_id == rxq->nb_rx_desc)
                        rx_id = 0;

                /* Prefetch next mbuf while processing current one. */
                rte_ixgbe_prefetch(sw_ring[rx_id].mbuf);

                /*
                 * When next RX descriptor is on a cache-line boundary,
                 * prefetch the next 4 RX descriptors and the next 8 pointers
                 * to mbufs.
                 */
                if ((rx_id & 0x3) == 0) {
                        rte_ixgbe_prefetch(&rx_ring[rx_id]);
                        rte_ixgbe_prefetch(&sw_ring[rx_id]);
                }

                rxm = rxe->mbuf;
                rxe->mbuf = nmb;
                dma_addr =
                        rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb));
                rxdp->read.hdr_addr = dma_addr;
                rxdp->read.pkt_addr = dma_addr;

                /*
                 * Initialize the returned mbuf.
                 * 1) setup generic mbuf fields:
                 *    - number of segments,
                 *    - next segment,
                 *    - packet length,
                 *    - RX port identifier.
                 * 2) integrate hardware offload data, if any:
                 *    - RSS flag & hash,
                 *    - IP checksum flag,
                 *    - VLAN TCI, if any,
                 *    - error flags.
                 */
                pkt_len = (uint16_t) (rte_le_to_cpu_16(rxd.wb.upper.length) -
                                      rxq->crc_len);
                rxm->data_off = RTE_PKTMBUF_HEADROOM;
                rte_packet_prefetch((char *)rxm->buf_addr + rxm->data_off);
                rxm->nb_segs = 1;
                rxm->next = NULL;
                rxm->pkt_len = pkt_len;
                rxm->data_len = pkt_len;
                rxm->port = rxq->port_id;

                hlen_type_rss = rte_le_to_cpu_32(rxd.wb.lower.lo_dword.data);
                /* Only valid if PKT_RX_VLAN_PKT set in pkt_flags */
                rxm->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);

                pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
                pkt_flags = pkt_flags | rx_desc_status_to_pkt_flags(staterr);
                pkt_flags = pkt_flags | rx_desc_error_to_pkt_flags(staterr);
                rxm->ol_flags = pkt_flags;

                if (likely(pkt_flags & PKT_RX_RSS_HASH))
                        rxm->hash.rss = rxd.wb.lower.hi_dword.rss;
                else if (pkt_flags & PKT_RX_FDIR) {
                        rxm->hash.fdir.hash =
                                (uint16_t)((rxd.wb.lower.hi_dword.csum_ip.csum)
                                           & IXGBE_ATR_HASH_MASK);
                        rxm->hash.fdir.id = rxd.wb.lower.hi_dword.csum_ip.ip_id;
                }
                /*
                 * Store the mbuf address into the next entry of the array
                 * of returned packets.
                 */
                rx_pkts[nb_rx++] = rxm;
        }
        rxq->rx_tail = rx_id;

        /*
         * If the number of free RX descriptors is greater than the RX free
         * threshold of the queue, advance the Receive Descriptor Tail (RDT)
         * register.
         * Update the RDT with the value of the last processed RX descriptor
         * minus 1, to guarantee that the RDT register is never equal to the
         * RDH register, which creates a "full" ring situtation from the
         * hardware point of view...
         */
        nb_hold = (uint16_t) (nb_hold + rxq->nb_rx_hold);
        if (nb_hold > rxq->rx_free_thresh) {
                PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
                           "nb_hold=%u nb_rx=%u",
                           (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
                           (unsigned) rx_id, (unsigned) nb_hold,
                           (unsigned) nb_rx);
                rx_id = (uint16_t) ((rx_id == 0) ?
                                     (rxq->nb_rx_desc - 1) : (rx_id - 1));
                IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
                nb_hold = 0;
        }
        rxq->nb_rx_hold = nb_hold;
        return (nb_rx);
}

/**
 * Detect an RSC descriptor.
 */
static inline uint32_t
ixgbe_rsc_count(union ixgbe_adv_rx_desc *rx)
{
        return (rte_le_to_cpu_32(rx->wb.lower.lo_dword.data) &
                IXGBE_RXDADV_RSCCNT_MASK) >> IXGBE_RXDADV_RSCCNT_SHIFT;
}

/**
 * ixgbe_fill_cluster_head_buf - fill the first mbuf of the returned packet
 *
 * Fill the following info in the HEAD buffer of the Rx cluster:
 *    - RX port identifier
 *    - hardware offload data, if any:
 *      - RSS flag & hash
 *      - IP checksum flag
 *      - VLAN TCI, if any
 *      - error flags
 * @head HEAD of the packet cluster
 * @desc HW descriptor to get data from
 * @port_id Port ID of the Rx queue
 */
static inline void
ixgbe_fill_cluster_head_buf(
        struct rte_mbuf *head,
        union ixgbe_adv_rx_desc *desc,
        uint8_t port_id,
        uint32_t staterr)
{
        uint32_t hlen_type_rss;
        uint64_t pkt_flags;

        head->port = port_id;

        /*
         * The vlan_tci field is only valid when PKT_RX_VLAN_PKT is
         * set in the pkt_flags field.
         */
        head->vlan_tci = rte_le_to_cpu_16(desc->wb.upper.vlan);
        hlen_type_rss = rte_le_to_cpu_32(desc->wb.lower.lo_dword.data);
        pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
        pkt_flags |= rx_desc_status_to_pkt_flags(staterr);
        pkt_flags |= rx_desc_error_to_pkt_flags(staterr);
        head->ol_flags = pkt_flags;

        if (likely(pkt_flags & PKT_RX_RSS_HASH))
                head->hash.rss = rte_le_to_cpu_32(desc->wb.lower.hi_dword.rss);
        else if (pkt_flags & PKT_RX_FDIR) {
                head->hash.fdir.hash =
                        rte_le_to_cpu_16(desc->wb.lower.hi_dword.csum_ip.csum)
                                                          & IXGBE_ATR_HASH_MASK;
                head->hash.fdir.id =
                        rte_le_to_cpu_16(desc->wb.lower.hi_dword.csum_ip.ip_id);
        }
}

/**
 * ixgbe_recv_pkts_lro - receive handler for and LRO case.
 *
 * @rx_queue Rx queue handle
 * @rx_pkts table of received packets
 * @nb_pkts size of rx_pkts table
 * @bulk_alloc if TRUE bulk allocation is used for a HW ring refilling
 *
 * Handles the Rx HW ring completions when RSC feature is configured. Uses an
 * additional ring of ixgbe_rsc_entry's that will hold the relevant RSC info.
 *
 * We use the same logic as in Linux and in FreeBSD ixgbe drivers:
 * 1) When non-EOP RSC completion arrives:
 *    a) Update the HEAD of the current RSC aggregation cluster with the new
 *       segment's data length.
 *    b) Set the "next" pointer of the current segment to point to the segment
 *       at the NEXTP index.
 *    c) Pass the HEAD of RSC aggregation cluster on to the next NEXTP entry
 *       in the sw_rsc_ring.
 * 2) When EOP arrives we just update the cluster's total length and offload
 *    flags and deliver the cluster up to the upper layers. In our case - put it
 *    in the rx_pkts table.
 *
 * Returns the number of received packets/clusters (according to the "bulk
 * receive" interface).
 */
static inline uint16_t
ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts,
                    bool bulk_alloc)
{
        struct ixgbe_rx_queue *rxq = rx_queue;
        volatile union ixgbe_adv_rx_desc *rx_ring = rxq->rx_ring;
        struct ixgbe_rx_entry *sw_ring = rxq->sw_ring;
        struct ixgbe_scattered_rx_entry *sw_sc_ring = rxq->sw_sc_ring;
        uint16_t rx_id = rxq->rx_tail;
        uint16_t nb_rx = 0;
        uint16_t nb_hold = rxq->nb_rx_hold;
        uint16_t prev_id = rxq->rx_tail;

        while (nb_rx < nb_pkts) {
                bool eop;
                struct ixgbe_rx_entry *rxe;
                struct ixgbe_scattered_rx_entry *sc_entry;
                struct ixgbe_scattered_rx_entry *next_sc_entry;
                struct ixgbe_rx_entry *next_rxe;
                struct rte_mbuf *first_seg;
                struct rte_mbuf *rxm;
                struct rte_mbuf *nmb;
                union ixgbe_adv_rx_desc rxd;
                uint16_t data_len;
                uint16_t next_id;
                volatile union ixgbe_adv_rx_desc *rxdp;
                uint32_t staterr;

next_desc:
                /*
                 * The code in this whole file uses the volatile pointer to
                 * ensure the read ordering of the status and the rest of the
                 * descriptor fields (on the compiler level only!!!). This is so
                 * UGLY - why not to just use the compiler barrier instead? DPDK
                 * even has the rte_compiler_barrier() for that.
                 *
                 * But most importantly this is just wrong because this doesn't
                 * ensure memory ordering in a general case at all. For
                 * instance, DPDK is supposed to work on Power CPUs where
                 * compiler barrier may just not be enough!
                 *
                 * I tried to write only this function properly to have a
                 * starting point (as a part of an LRO/RSC series) but the
                 * compiler cursed at me when I tried to cast away the
                 * "volatile" from rx_ring (yes, it's volatile too!!!). So, I'm
                 * keeping it the way it is for now.
                 *
                 * The code in this file is broken in so many other places and
                 * will just not work on a big endian CPU anyway therefore the
                 * lines below will have to be revisited together with the rest
                 * of the ixgbe PMD.
                 *
                 * TODO:
                 *    - Get rid of "volatile" crap and let the compiler do its
                 *      job.
                 *    - Use the proper memory barrier (rte_rmb()) to ensure the
                 *      memory ordering below.
                 */
                rxdp = &rx_ring[rx_id];
                staterr = rte_le_to_cpu_32(rxdp->wb.upper.status_error);

                if (!(staterr & IXGBE_RXDADV_STAT_DD))
                        break;

                rxd = *rxdp;

                PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u "
                                  "staterr=0x%x data_len=%u",
                           rxq->port_id, rxq->queue_id, rx_id, staterr,
                           rte_le_to_cpu_16(rxd.wb.upper.length));

                if (!bulk_alloc) {
                        nmb = rte_rxmbuf_alloc(rxq->mb_pool);
                        if (nmb == NULL) {
                                PMD_RX_LOG(DEBUG, "RX mbuf alloc failed "
                                                  "port_id=%u queue_id=%u",
                                           rxq->port_id, rxq->queue_id);

                                rte_eth_devices[rxq->port_id].data->
                                                        rx_mbuf_alloc_failed++;
                                break;
                        }
                } else if (nb_hold > rxq->rx_free_thresh) {
                        uint16_t next_rdt = rxq->rx_free_trigger;

                        if (!ixgbe_rx_alloc_bufs(rxq, false)) {
                                rte_wmb();
                                IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr,
                                                    next_rdt);
                                nb_hold -= rxq->rx_free_thresh;
                        } else {
                                PMD_RX_LOG(DEBUG, "RX bulk alloc failed "
                                                  "port_id=%u queue_id=%u",
                                           rxq->port_id, rxq->queue_id);

                                rte_eth_devices[rxq->port_id].data->
                                                        rx_mbuf_alloc_failed++;
                                break;
                        }
                }

                nb_hold++;
                rxe = &sw_ring[rx_id];
                eop = staterr & IXGBE_RXDADV_STAT_EOP;

                next_id = rx_id + 1;
                if (next_id == rxq->nb_rx_desc)
                        next_id = 0;

                /* Prefetch next mbuf while processing current one. */
                rte_ixgbe_prefetch(sw_ring[next_id].mbuf);

                /*
                 * When next RX descriptor is on a cache-line boundary,
                 * prefetch the next 4 RX descriptors and the next 4 pointers
                 * to mbufs.
                 */
                if ((next_id & 0x3) == 0) {
                        rte_ixgbe_prefetch(&rx_ring[next_id]);
                        rte_ixgbe_prefetch(&sw_ring[next_id]);
                }

                rxm = rxe->mbuf;

                if (!bulk_alloc) {
                        __le64 dma =
                          rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb));
                        /*
                         * Update RX descriptor with the physical address of the
                         * new data buffer of the new allocated mbuf.
                         */
                        rxe->mbuf = nmb;

                        rxm->data_off = RTE_PKTMBUF_HEADROOM;
                        rxdp->read.hdr_addr = dma;
                        rxdp->read.pkt_addr = dma;
                } else
                        rxe->mbuf = NULL;

                /*
                 * Set data length & data buffer address of mbuf.
                 */
                data_len = rte_le_to_cpu_16(rxd.wb.upper.length);
                rxm->data_len = data_len;

                if (!eop) {
                        uint16_t nextp_id;
                        /*
                         * Get next descriptor index:
                         *  - For RSC it's in the NEXTP field.
                         *  - For a scattered packet - it's just a following
                         *    descriptor.
                         */
                        if (ixgbe_rsc_count(&rxd))
                                nextp_id =
                                        (staterr & IXGBE_RXDADV_NEXTP_MASK) >>
                                                       IXGBE_RXDADV_NEXTP_SHIFT;
                        else
                                nextp_id = next_id;

                        next_sc_entry = &sw_sc_ring[nextp_id];
                        next_rxe = &sw_ring[nextp_id];
                        rte_ixgbe_prefetch(next_rxe);
                }

                sc_entry = &sw_sc_ring[rx_id];
                first_seg = sc_entry->fbuf;
                sc_entry->fbuf = NULL;

                /*
                 * If this is the first buffer of the received packet,
                 * set the pointer to the first mbuf of the packet and
                 * initialize its context.
                 * Otherwise, update the total length and the number of segments
                 * of the current scattered packet, and update the pointer to
                 * the last mbuf of the current packet.
                 */
                if (first_seg == NULL) {
                        first_seg = rxm;
                        first_seg->pkt_len = data_len;
                        first_seg->nb_segs = 1;
                } else {
                        first_seg->pkt_len += data_len;
                        first_seg->nb_segs++;
                }

                prev_id = rx_id;
                rx_id = next_id;

                /*
                 * If this is not the last buffer of the received packet, update
                 * the pointer to the first mbuf at the NEXTP entry in the
                 * sw_sc_ring and continue to parse the RX ring.
                 */
                if (!eop) {
                        rxm->next = next_rxe->mbuf;
                        next_sc_entry->fbuf = first_seg;
                        goto next_desc;
                }

                /*
                 * This is the last buffer of the received packet - return
                 * the current cluster to the user.
                 */
                rxm->next = NULL;

                /* Initialize the first mbuf of the returned packet */
                ixgbe_fill_cluster_head_buf(first_seg, &rxd, rxq->port_id,
                                            staterr);

                /* Prefetch data of first segment, if configured to do so. */
                rte_packet_prefetch((char *)first_seg->buf_addr +
                        first_seg->data_off);

                /*
                 * Store the mbuf address into the next entry of the array
                 * of returned packets.
                 */
                rx_pkts[nb_rx++] = first_seg;
        }

        /*
         * Record index of the next RX descriptor to probe.
         */
        rxq->rx_tail = rx_id;

        /*
         * If the number of free RX descriptors is greater than the RX free
         * threshold of the queue, advance the Receive Descriptor Tail (RDT)
         * register.
         * Update the RDT with the value of the last processed RX descriptor
         * minus 1, to guarantee that the RDT register is never equal to the
         * RDH register, which creates a "full" ring situtation from the
         * hardware point of view...
         */
        if (!bulk_alloc && nb_hold > rxq->rx_free_thresh) {
                PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
                           "nb_hold=%u nb_rx=%u",
                           rxq->port_id, rxq->queue_id, rx_id, nb_hold, nb_rx);

                rte_wmb();
                IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, prev_id);
                nb_hold = 0;
        }

        rxq->nb_rx_hold = nb_hold;
        return nb_rx;
}

uint16_t
ixgbe_recv_pkts_lro_single_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
                                 uint16_t nb_pkts)
{
        return ixgbe_recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, false);
}

uint16_t
ixgbe_recv_pkts_lro_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
                               uint16_t nb_pkts)
{
        return ixgbe_recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, true);
}

/*********************************************************************
 *
 *  Queue management functions
 *
 **********************************************************************/

/*
 * Rings setup and release.
 *
 * TDBA/RDBA should be aligned on 16 byte boundary. But TDLEN/RDLEN should be
 * multiple of 128 bytes. So we align TDBA/RDBA on 128 byte boundary. This will
 * also optimize cache line size effect. H/W supports up to cache line size 128.
 */
#define IXGBE_ALIGN 128

/*
 * Maximum number of Ring Descriptors.
 *
 * Since RDLEN/TDLEN should be multiple of 128 bytes, the number of ring
 * descriptors should meet the following condition:
 *      (num_ring_desc * sizeof(rx/tx descriptor)) % 128 == 0
 */
#define IXGBE_MIN_RING_DESC 32
#define IXGBE_MAX_RING_DESC 4096

/*
 * Create memzone for HW rings. malloc can't be used as the physical address is
 * needed. If the memzone is already created, then this function returns a ptr
 * to the old one.
 */
static const struct rte_memzone *
ring_dma_zone_reserve(struct rte_eth_dev *dev, const char *ring_name,
                      uint16_t queue_id, uint32_t ring_size, int socket_id)
{
        char z_name[RTE_MEMZONE_NAMESIZE];
        const struct rte_memzone *mz;

        snprintf(z_name, sizeof(z_name), "%s_%s_%d_%d",
                        dev->driver->pci_drv.name, ring_name,
                        dev->data->port_id, queue_id);

        mz = rte_memzone_lookup(z_name);
        if (mz)
                return mz;

#ifdef RTE_LIBRTE_XEN_DOM0
        return rte_memzone_reserve_bounded(z_name, ring_size,
                socket_id, 0, IXGBE_ALIGN, RTE_PGSIZE_2M);
#else
        return rte_memzone_reserve_aligned(z_name, ring_size,
                socket_id, 0, IXGBE_ALIGN);
#endif
}

static void
ixgbe_tx_queue_release_mbufs(struct ixgbe_tx_queue *txq)
{
        unsigned i;

        if (txq->sw_ring != NULL) {
                for (i = 0; i < txq->nb_tx_desc; i++) {
                        if (txq->sw_ring[i].mbuf != NULL) {
                                rte_pktmbuf_free_seg(txq->sw_ring[i].mbuf);
                                txq->sw_ring[i].mbuf = NULL;
                        }
                }
        }
}

static void
ixgbe_tx_free_swring(struct ixgbe_tx_queue *txq)
{
        if (txq != NULL &&
            txq->sw_ring != NULL)
                rte_free(txq->sw_ring);
}

static void
ixgbe_tx_queue_release(struct ixgbe_tx_queue *txq)
{
        if (txq != NULL && txq->ops != NULL) {
                txq->ops->release_mbufs(txq);
                txq->ops->free_swring(txq);
                rte_free(txq);
        }
}

void
ixgbe_dev_tx_queue_release(void *txq)
{
        ixgbe_tx_queue_release(txq);
}

/* (Re)set dynamic ixgbe_tx_queue fields to defaults */
static void
ixgbe_reset_tx_queue(struct ixgbe_tx_queue *txq)
{
        static const union ixgbe_adv_tx_desc zeroed_desc = {{0}};
        struct ixgbe_tx_entry *txe = txq->sw_ring;
        uint16_t prev, i;

        /* Zero out HW ring memory */
        for (i = 0; i < txq->nb_tx_desc; i++) {
                txq->tx_ring[i] = zeroed_desc;
        }

        /* Initialize SW ring entries */
        prev = (uint16_t) (txq->nb_tx_desc - 1);
        for (i = 0; i < txq->nb_tx_desc; i++) {
                volatile union ixgbe_adv_tx_desc *txd = &txq->tx_ring[i];
                txd->wb.status = IXGBE_TXD_STAT_DD;
                txe[i].mbuf = NULL;
                txe[i].last_id = i;
                txe[prev].next_id = i;
                prev = i;
        }

        txq->tx_next_dd = (uint16_t)(txq->tx_rs_thresh - 1);
        txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);

        txq->tx_tail = 0;
        txq->nb_tx_used = 0;
        /*
         * Always allow 1 descriptor to be un-allocated to avoid
         * a H/W race condition
         */
        txq->last_desc_cleaned = (uint16_t)(txq->nb_tx_desc - 1);
        txq->nb_tx_free = (uint16_t)(txq->nb_tx_desc - 1);
        txq->ctx_curr = 0;
        memset((void*)&txq->ctx_cache, 0,
                IXGBE_CTX_NUM * sizeof(struct ixgbe_advctx_info));
}

static const struct ixgbe_txq_ops def_txq_ops = {
        .release_mbufs = ixgbe_tx_queue_release_mbufs,
        .free_swring = ixgbe_tx_free_swring,
        .reset = ixgbe_reset_tx_queue,
};

/* Takes an ethdev and a queue and sets up the tx function to be used based on
 * the queue parameters. Used in tx_queue_setup by primary process and then
 * in dev_init by secondary process when attaching to an existing ethdev.
 */
void
ixgbe_set_tx_function(struct rte_eth_dev *dev, struct ixgbe_tx_queue *txq)
{
        /* Use a simple Tx queue (no offloads, no multi segs) if possible */
        if (((txq->txq_flags & IXGBE_SIMPLE_FLAGS) == IXGBE_SIMPLE_FLAGS)
                        && (txq->tx_rs_thresh >= RTE_PMD_IXGBE_TX_MAX_BURST)) {
                PMD_INIT_LOG(INFO, "Using simple tx code path");
#ifdef RTE_IXGBE_INC_VECTOR
                if (txq->tx_rs_thresh <= RTE_IXGBE_TX_MAX_FREE_BUF_SZ &&
                                (rte_eal_process_type() != RTE_PROC_PRIMARY ||
                                        ixgbe_txq_vec_setup(txq) == 0)) {
                        PMD_INIT_LOG(INFO, "Vector tx enabled.");
                        dev->tx_pkt_burst = ixgbe_xmit_pkts_vec;
                } else
#endif
                dev->tx_pkt_burst = ixgbe_xmit_pkts_simple;
        } else {
                PMD_INIT_LOG(INFO, "Using full-featured tx code path");
                PMD_INIT_LOG(INFO,
                                " - txq_flags = %lx " "[IXGBE_SIMPLE_FLAGS=%lx]",
                                (unsigned long)txq->txq_flags,
                                (unsigned long)IXGBE_SIMPLE_FLAGS);
                PMD_INIT_LOG(INFO,
                                " - tx_rs_thresh = %lu " "[RTE_PMD_IXGBE_TX_MAX_BURST=%lu]",
                                (unsigned long)txq->tx_rs_thresh,
                                (unsigned long)RTE_PMD_IXGBE_TX_MAX_BURST);
                dev->tx_pkt_burst = ixgbe_xmit_pkts;
        }
}

int
ixgbe_dev_tx_queue_setup(struct rte_eth_dev *dev,
                         uint16_t queue_idx,
                         uint16_t nb_desc,
                         unsigned int socket_id,
                         const struct rte_eth_txconf *tx_conf)
{
        const struct rte_memzone *tz;
        struct ixgbe_tx_queue *txq;
        struct ixgbe_hw     *hw;
        uint16_t tx_rs_thresh, tx_free_thresh;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /*
         * Validate number of transmit descriptors.
         * It must not exceed hardware maximum, and must be multiple
         * of IXGBE_ALIGN.
         */
        if (((nb_desc * sizeof(union ixgbe_adv_tx_desc)) % IXGBE_ALIGN) != 0 ||
            (nb_desc > IXGBE_MAX_RING_DESC) ||
            (nb_desc < IXGBE_MIN_RING_DESC)) {
                return -EINVAL;
        }

        /*
         * The following two parameters control the setting of the RS bit on
         * transmit descriptors.
         * TX descriptors will have their RS bit set after txq->tx_rs_thresh
         * descriptors have been used.
         * The TX descriptor ring will be cleaned after txq->tx_free_thresh
         * descriptors are used or if the number of descriptors required
         * to transmit a packet is greater than the number of free TX
         * descriptors.
         * The following constraints must be satisfied:
         *  tx_rs_thresh must be greater than 0.
         *  tx_rs_thresh must be less than the size of the ring minus 2.
         *  tx_rs_thresh must be less than or equal to tx_free_thresh.
         *  tx_rs_thresh must be a divisor of the ring size.
         *  tx_free_thresh must be greater than 0.
         *  tx_free_thresh must be less than the size of the ring minus 3.
         * One descriptor in the TX ring is used as a sentinel to avoid a
         * H/W race condition, hence the maximum threshold constraints.
         * When set to zero use default values.
         */
        tx_rs_thresh = (uint16_t)((tx_conf->tx_rs_thresh) ?
                        tx_conf->tx_rs_thresh : DEFAULT_TX_RS_THRESH);
        tx_free_thresh = (uint16_t)((tx_conf->tx_free_thresh) ?
                        tx_conf->tx_free_thresh : DEFAULT_TX_FREE_THRESH);
        if (tx_rs_thresh >= (nb_desc - 2)) {
                PMD_INIT_LOG(ERR, "tx_rs_thresh must be less than the number "
                             "of TX descriptors minus 2. (tx_rs_thresh=%u "
                             "port=%d queue=%d)", (unsigned int)tx_rs_thresh,
                             (int)dev->data->port_id, (int)queue_idx);
                return -(EINVAL);
        }
        if (tx_free_thresh >= (nb_desc - 3)) {
                PMD_INIT_LOG(ERR, "tx_rs_thresh must be less than the "
                             "tx_free_thresh must be less than the number of "
                             "TX descriptors minus 3. (tx_free_thresh=%u "
                             "port=%d queue=%d)",
                             (unsigned int)tx_free_thresh,
                             (int)dev->data->port_id, (int)queue_idx);
                return -(EINVAL);
        }
        if (tx_rs_thresh > tx_free_thresh) {
                PMD_INIT_LOG(ERR, "tx_rs_thresh must be less than or equal to "
                             "tx_free_thresh. (tx_free_thresh=%u "
                             "tx_rs_thresh=%u port=%d queue=%d)",
                             (unsigned int)tx_free_thresh,
                             (unsigned int)tx_rs_thresh,
                             (int)dev->data->port_id,
                             (int)queue_idx);
                return -(EINVAL);
        }
        if ((nb_desc % tx_rs_thresh) != 0) {
                PMD_INIT_LOG(ERR, "tx_rs_thresh must be a divisor of the "
                             "number of TX descriptors. (tx_rs_thresh=%u "
                             "port=%d queue=%d)", (unsigned int)tx_rs_thresh,
                             (int)dev->data->port_id, (int)queue_idx);
                return -(EINVAL);
        }

        /*
         * If rs_bit_thresh is greater than 1, then TX WTHRESH should be
         * set to 0. If WTHRESH is greater than zero, the RS bit is ignored
         * by the NIC and all descriptors are written back after the NIC
         * accumulates WTHRESH descriptors.
         */
        if ((tx_rs_thresh > 1) && (tx_conf->tx_thresh.wthresh != 0)) {
                PMD_INIT_LOG(ERR, "TX WTHRESH must be set to 0 if "
                             "tx_rs_thresh is greater than 1. (tx_rs_thresh=%u "
                             "port=%d queue=%d)", (unsigned int)tx_rs_thresh,
                             (int)dev->data->port_id, (int)queue_idx);
                return -(EINVAL);
        }

        /* Free memory prior to re-allocation if needed... */
        if (dev->data->tx_queues[queue_idx] != NULL) {
                ixgbe_tx_queue_release(dev->data->tx_queues[queue_idx]);
                dev->data->tx_queues[queue_idx] = NULL;
        }

        /* First allocate the tx queue data structure */
        txq = rte_zmalloc_socket("ethdev TX queue", sizeof(struct ixgbe_tx_queue),
                                 RTE_CACHE_LINE_SIZE, socket_id);
        if (txq == NULL)
                return (-ENOMEM);

        /*
         * Allocate TX ring hardware descriptors. A memzone large enough to
         * handle the maximum ring size is allocated in order to allow for
         * resizing in later calls to the queue setup function.
         */
        tz = ring_dma_zone_reserve(dev, "tx_ring", queue_idx,
                        sizeof(union ixgbe_adv_tx_desc) * IXGBE_MAX_RING_DESC,
                        socket_id);
        if (tz == NULL) {
                ixgbe_tx_queue_release(txq);
                return (-ENOMEM);
        }

        txq->nb_tx_desc = nb_desc;
        txq->tx_rs_thresh = tx_rs_thresh;
        txq->tx_free_thresh = tx_free_thresh;
        txq->pthresh = tx_conf->tx_thresh.pthresh;
        txq->hthresh = tx_conf->tx_thresh.hthresh;
        txq->wthresh = tx_conf->tx_thresh.wthresh;
        txq->queue_id = queue_idx;
        txq->reg_idx = (uint16_t)((RTE_ETH_DEV_SRIOV(dev).active == 0) ?
                queue_idx : RTE_ETH_DEV_SRIOV(dev).def_pool_q_idx + queue_idx);
        txq->port_id = dev->data->port_id;
        txq->txq_flags = tx_conf->txq_flags;
        txq->ops = &def_txq_ops;
        txq->tx_deferred_start = tx_conf->tx_deferred_start;

        /*
         * Modification to set VFTDT for virtual function if vf is detected
         */
        if (hw->mac.type == ixgbe_mac_82599_vf ||
            hw->mac.type == ixgbe_mac_X540_vf ||
            hw->mac.type == ixgbe_mac_X550_vf ||
            hw->mac.type == ixgbe_mac_X550EM_x_vf)
                txq->tdt_reg_addr = IXGBE_PCI_REG_ADDR(hw, IXGBE_VFTDT(queue_idx));
        else
                txq->tdt_reg_addr = IXGBE_PCI_REG_ADDR(hw, IXGBE_TDT(txq->reg_idx));
#ifndef RTE_LIBRTE_XEN_DOM0
        txq->tx_ring_phys_addr = (uint64_t) tz->phys_addr;
#else
        txq->tx_ring_phys_addr = rte_mem_phy2mch(tz->memseg_id, tz->phys_addr);
#endif
        txq->tx_ring = (union ixgbe_adv_tx_desc *) tz->addr;

        /* Allocate software ring */
        txq->sw_ring = rte_zmalloc_socket("txq->sw_ring",
                                sizeof(struct ixgbe_tx_entry) * nb_desc,
                                RTE_CACHE_LINE_SIZE, socket_id);
        if (txq->sw_ring == NULL) {
                ixgbe_tx_queue_release(txq);
                return (-ENOMEM);
        }
        PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64,
                     txq->sw_ring, txq->tx_ring, txq->tx_ring_phys_addr);

        /* set up vector or scalar TX function as appropriate */
        ixgbe_set_tx_function(dev, txq);

        txq->ops->reset(txq);

        dev->data->tx_queues[queue_idx] = txq;


        return (0);
}

/**
 * ixgbe_free_sc_cluster - free the not-yet-completed scattered cluster
 *
 * The "next" pointer of the last segment of (not-yet-completed) RSC clusters
 * in the sw_rsc_ring is not set to NULL but rather points to the next
 * mbuf of this RSC aggregation (that has not been completed yet and still
 * resides on the HW ring). So, instead of calling for rte_pktmbuf_free() we
 * will just free first "nb_segs" segments of the cluster explicitly by calling
 * an rte_pktmbuf_free_seg().
 *
 * @m scattered cluster head
 */
static void
ixgbe_free_sc_cluster(struct rte_mbuf *m)
{
        uint8_t i, nb_segs = m->nb_segs;
        struct rte_mbuf *next_seg;

        for (i = 0; i < nb_segs; i++) {
                next_seg = m->next;
                rte_pktmbuf_free_seg(m);
                m = next_seg;
        }
}

static void
ixgbe_rx_queue_release_mbufs(struct ixgbe_rx_queue *rxq)
{
        unsigned i;

        if (rxq->sw_ring != NULL) {
                for (i = 0; i < rxq->nb_rx_desc; i++) {
                        if (rxq->sw_ring[i].mbuf != NULL) {
                                rte_pktmbuf_free_seg(rxq->sw_ring[i].mbuf);
                                rxq->sw_ring[i].mbuf = NULL;
                        }
                }
#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
                if (rxq->rx_nb_avail) {
                        for (i = 0; i < rxq->rx_nb_avail; ++i) {
                                struct rte_mbuf *mb;
                                mb = rxq->rx_stage[rxq->rx_next_avail + i];
                                rte_pktmbuf_free_seg(mb);
                        }
                        rxq->rx_nb_avail = 0;
                }
#endif
        }

        if (rxq->sw_sc_ring)
                for (i = 0; i < rxq->nb_rx_desc; i++)
                        if (rxq->sw_sc_ring[i].fbuf) {
                                ixgbe_free_sc_cluster(rxq->sw_sc_ring[i].fbuf);
                                rxq->sw_sc_ring[i].fbuf = NULL;
                        }
}

static void
ixgbe_rx_queue_release(struct ixgbe_rx_queue *rxq)
{
        if (rxq != NULL) {
                ixgbe_rx_queue_release_mbufs(rxq);
                rte_free(rxq->sw_ring);
                rte_free(rxq->sw_sc_ring);
                rte_free(rxq);
        }
}

void
ixgbe_dev_rx_queue_release(void *rxq)
{
        ixgbe_rx_queue_release(rxq);
}

/*
 * Check if Rx Burst Bulk Alloc function can be used.
 * Return
 *        0: the preconditions are satisfied and the bulk allocation function
 *           can be used.
 *  -EINVAL: the preconditions are NOT satisfied and the default Rx burst
 *           function must be used.
 */
static inline int
#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
check_rx_burst_bulk_alloc_preconditions(struct ixgbe_rx_queue *rxq)
#else
check_rx_burst_bulk_alloc_preconditions(__rte_unused struct ixgbe_rx_queue *rxq)
#endif
{
        int ret = 0;

        /*
         * Make sure the following pre-conditions are satisfied:
         *   rxq->rx_free_thresh >= RTE_PMD_IXGBE_RX_MAX_BURST
         *   rxq->rx_free_thresh < rxq->nb_rx_desc
         *   (rxq->nb_rx_desc % rxq->rx_free_thresh) == 0
         *   rxq->nb_rx_desc<(IXGBE_MAX_RING_DESC-RTE_PMD_IXGBE_RX_MAX_BURST)
         * Scattered packets are not supported.  This should be checked
         * outside of this function.
         */
#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
        if (!(rxq->rx_free_thresh >= RTE_PMD_IXGBE_RX_MAX_BURST)) {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
                             "rxq->rx_free_thresh=%d, "
                             "RTE_PMD_IXGBE_RX_MAX_BURST=%d",
                             rxq->rx_free_thresh, RTE_PMD_IXGBE_RX_MAX_BURST);
                ret = -EINVAL;
        } else if (!(rxq->rx_free_thresh < rxq->nb_rx_desc)) {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
                             "rxq->rx_free_thresh=%d, "
                             "rxq->nb_rx_desc=%d",
                             rxq->rx_free_thresh, rxq->nb_rx_desc);
                ret = -EINVAL;
        } else if (!((rxq->nb_rx_desc % rxq->rx_free_thresh) == 0)) {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
                             "rxq->nb_rx_desc=%d, "
                             "rxq->rx_free_thresh=%d",
                             rxq->nb_rx_desc, rxq->rx_free_thresh);
                ret = -EINVAL;
        } else if (!(rxq->nb_rx_desc <
               (IXGBE_MAX_RING_DESC - RTE_PMD_IXGBE_RX_MAX_BURST))) {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
                             "rxq->nb_rx_desc=%d, "
                             "IXGBE_MAX_RING_DESC=%d, "
                             "RTE_PMD_IXGBE_RX_MAX_BURST=%d",
                             rxq->nb_rx_desc, IXGBE_MAX_RING_DESC,
                             RTE_PMD_IXGBE_RX_MAX_BURST);
                ret = -EINVAL;
        }
#else
        ret = -EINVAL;
#endif

        return ret;
}

/* Reset dynamic ixgbe_rx_queue fields back to defaults */
static void
ixgbe_reset_rx_queue(struct ixgbe_adapter *adapter, struct ixgbe_rx_queue *rxq)
{
        static const union ixgbe_adv_rx_desc zeroed_desc = {{0}};
        unsigned i;
        uint16_t len = rxq->nb_rx_desc;

        /*
         * By default, the Rx queue setup function allocates enough memory for
         * IXGBE_MAX_RING_DESC.  The Rx Burst bulk allocation function requires
         * extra memory at the end of the descriptor ring to be zero'd out. A
         * pre-condition for using the Rx burst bulk alloc function is that the
         * number of descriptors is less than or equal to
         * (IXGBE_MAX_RING_DESC - RTE_PMD_IXGBE_RX_MAX_BURST). Check all the
         * constraints here to see if we need to zero out memory after the end
         * of the H/W descriptor ring.
         */
        if (adapter->rx_bulk_alloc_allowed)
                /* zero out extra memory */
                len += RTE_PMD_IXGBE_RX_MAX_BURST;

        /*
         * Zero out HW ring memory. Zero out extra memory at the end of
         * the H/W ring so look-ahead logic in Rx Burst bulk alloc function
         * reads extra memory as zeros.
         */
        for (i = 0; i < len; i++) {
                rxq->rx_ring[i] = zeroed_desc;
        }

#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
        /*
         * initialize extra software ring entries. Space for these extra
         * entries is always allocated
         */
        memset(&rxq->fake_mbuf, 0x0, sizeof(rxq->fake_mbuf));
        for (i = rxq->nb_rx_desc; i < len; ++i) {
                rxq->sw_ring[i].mbuf = &rxq->fake_mbuf;
        }

        rxq->rx_nb_avail = 0;
        rxq->rx_next_avail = 0;
        rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_thresh - 1);
#endif /* RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC */
        rxq->rx_tail = 0;
        rxq->nb_rx_hold = 0;
        rxq->pkt_first_seg = NULL;
        rxq->pkt_last_seg = NULL;
}

int
ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
                         uint16_t queue_idx,
                         uint16_t nb_desc,
                         unsigned int socket_id,
                         const struct rte_eth_rxconf *rx_conf,
                         struct rte_mempool *mp)
{
        const struct rte_memzone *rz;
        struct ixgbe_rx_queue *rxq;
        struct ixgbe_hw     *hw;
        uint16_t len;
        struct ixgbe_adapter *adapter =
                (struct ixgbe_adapter *)dev->data->dev_private;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /*
         * Validate number of receive descriptors.
         * It must not exceed hardware maximum, and must be multiple
         * of IXGBE_ALIGN.
         */
        if (((nb_desc * sizeof(union ixgbe_adv_rx_desc)) % IXGBE_ALIGN) != 0 ||
            (nb_desc > IXGBE_MAX_RING_DESC) ||
            (nb_desc < IXGBE_MIN_RING_DESC)) {
                return (-EINVAL);
        }

        /* Free memory prior to re-allocation if needed... */
        if (dev->data->rx_queues[queue_idx] != NULL) {
                ixgbe_rx_queue_release(dev->data->rx_queues[queue_idx]);
                dev->data->rx_queues[queue_idx] = NULL;
        }

        /* First allocate the rx queue data structure */
        rxq = rte_zmalloc_socket("ethdev RX queue", sizeof(struct ixgbe_rx_queue),
                                 RTE_CACHE_LINE_SIZE, socket_id);
        if (rxq == NULL)
                return (-ENOMEM);
        rxq->mb_pool = mp;
        rxq->nb_rx_desc = nb_desc;
        rxq->rx_free_thresh = rx_conf->rx_free_thresh;
        rxq->queue_id = queue_idx;
        rxq->reg_idx = (uint16_t)((RTE_ETH_DEV_SRIOV(dev).active == 0) ?
                queue_idx : RTE_ETH_DEV_SRIOV(dev).def_pool_q_idx + queue_idx);
        rxq->port_id = dev->data->port_id;
        rxq->crc_len = (uint8_t) ((dev->data->dev_conf.rxmode.hw_strip_crc) ?
                                                        0 : ETHER_CRC_LEN);
        rxq->drop_en = rx_conf->rx_drop_en;
        rxq->rx_deferred_start = rx_conf->rx_deferred_start;

        /*
         * Allocate RX ring hardware descriptors. A memzone large enough to
         * handle the maximum ring size is allocated in order to allow for
         * resizing in later calls to the queue setup function.
         */
        rz = ring_dma_zone_reserve(dev, "rx_ring", queue_idx,
                                   RX_RING_SZ, socket_id);
        if (rz == NULL) {
                ixgbe_rx_queue_release(rxq);
                return (-ENOMEM);
        }

        /*
         * Zero init all the descriptors in the ring.
         */
        memset (rz->addr, 0, RX_RING_SZ);

        /*
         * Modified to setup VFRDT for Virtual Function
         */
        if (hw->mac.type == ixgbe_mac_82599_vf ||
            hw->mac.type == ixgbe_mac_X540_vf ||
            hw->mac.type == ixgbe_mac_X550_vf ||
            hw->mac.type == ixgbe_mac_X550EM_x_vf) {
                rxq->rdt_reg_addr =
                        IXGBE_PCI_REG_ADDR(hw, IXGBE_VFRDT(queue_idx));
                rxq->rdh_reg_addr =
                        IXGBE_PCI_REG_ADDR(hw, IXGBE_VFRDH(queue_idx));
        }
        else {
                rxq->rdt_reg_addr =
                        IXGBE_PCI_REG_ADDR(hw, IXGBE_RDT(rxq->reg_idx));
                rxq->rdh_reg_addr =
                        IXGBE_PCI_REG_ADDR(hw, IXGBE_RDH(rxq->reg_idx));
        }
#ifndef RTE_LIBRTE_XEN_DOM0
        rxq->rx_ring_phys_addr = (uint64_t) rz->phys_addr;
#else
        rxq->rx_ring_phys_addr = rte_mem_phy2mch(rz->memseg_id, rz->phys_addr);
#endif
        rxq->rx_ring = (union ixgbe_adv_rx_desc *) rz->addr;

        /*
         * Certain constraints must be met in order to use the bulk buffer
         * allocation Rx burst function. If any of Rx queues doesn't meet them
         * the feature should be disabled for the whole port.
         */
        if (check_rx_burst_bulk_alloc_preconditions(rxq)) {
                PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Rx Bulk Alloc "
                                    "preconditions - canceling the feature for "
                                    "the whole port[%d]",
                             rxq->queue_id, rxq->port_id);
                adapter->rx_bulk_alloc_allowed = false;
        }

        /*
         * Allocate software ring. Allow for space at the end of the
         * S/W ring to make sure look-ahead logic in bulk alloc Rx burst
         * function does not access an invalid memory region.
         */
        len = nb_desc;
        if (adapter->rx_bulk_alloc_allowed)
                len += RTE_PMD_IXGBE_RX_MAX_BURST;

        rxq->sw_ring = rte_zmalloc_socket("rxq->sw_ring",
                                          sizeof(struct ixgbe_rx_entry) * len,
                                          RTE_CACHE_LINE_SIZE, socket_id);
        if (!rxq->sw_ring) {
                ixgbe_rx_queue_release(rxq);
                return (-ENOMEM);
        }

        /*
         * Always allocate even if it's not going to be needed in order to
         * simplify the code.
         *
         * This ring is used in LRO and Scattered Rx cases and Scattered Rx may
         * be requested in ixgbe_dev_rx_init(), which is called later from
         * dev_start() flow.
         */
        rxq->sw_sc_ring =
                rte_zmalloc_socket("rxq->sw_sc_ring",
                                   sizeof(struct ixgbe_scattered_rx_entry) * len,
                                   RTE_CACHE_LINE_SIZE, socket_id);
        if (!rxq->sw_sc_ring) {
                ixgbe_rx_queue_release(rxq);
                return (-ENOMEM);
        }

        PMD_INIT_LOG(DEBUG, "sw_ring=%p sw_sc_ring=%p hw_ring=%p "
                            "dma_addr=0x%"PRIx64,
                     rxq->sw_ring, rxq->sw_sc_ring, rxq->rx_ring,
                     rxq->rx_ring_phys_addr);

        if (!rte_is_power_of_2(nb_desc)) {
                PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Vector Rx "
                                    "preconditions - canceling the feature for "
                                    "the whole port[%d]",
                             rxq->queue_id, rxq->port_id);
                adapter->rx_vec_allowed = false;
        } else
                ixgbe_rxq_vec_setup(rxq);

        dev->data->rx_queues[queue_idx] = rxq;

        ixgbe_reset_rx_queue(adapter, rxq);

        return 0;
}

uint32_t
ixgbe_dev_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
#define IXGBE_RXQ_SCAN_INTERVAL 4
        volatile union ixgbe_adv_rx_desc *rxdp;
        struct ixgbe_rx_queue *rxq;
        uint32_t desc = 0;

        if (rx_queue_id >= dev->data->nb_rx_queues) {
                PMD_RX_LOG(ERR, "Invalid RX queue id=%d", rx_queue_id);
                return 0;
        }

        rxq = dev->data->rx_queues[rx_queue_id];
        rxdp = &(rxq->rx_ring[rxq->rx_tail]);

        while ((desc < rxq->nb_rx_desc) &&
                (rxdp->wb.upper.status_error & IXGBE_RXDADV_STAT_DD)) {
                desc += IXGBE_RXQ_SCAN_INTERVAL;
                rxdp += IXGBE_RXQ_SCAN_INTERVAL;
                if (rxq->rx_tail + desc >= rxq->nb_rx_desc)
                        rxdp = &(rxq->rx_ring[rxq->rx_tail +
                                desc - rxq->nb_rx_desc]);
        }

        return desc;
}

int
ixgbe_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
{
        volatile union ixgbe_adv_rx_desc *rxdp;
        struct ixgbe_rx_queue *rxq = rx_queue;
        uint32_t desc;

        if (unlikely(offset >= rxq->nb_rx_desc))
                return 0;
        desc = rxq->rx_tail + offset;
        if (desc >= rxq->nb_rx_desc)
                desc -= rxq->nb_rx_desc;

        rxdp = &rxq->rx_ring[desc];
        return !!(rxdp->wb.upper.status_error & IXGBE_RXDADV_STAT_DD);
}

void
ixgbe_dev_clear_queues(struct rte_eth_dev *dev)
{
        unsigned i;
        struct ixgbe_adapter *adapter =
                (struct ixgbe_adapter *)dev->data->dev_private;

        PMD_INIT_FUNC_TRACE();

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                struct ixgbe_tx_queue *txq = dev->data->tx_queues[i];
                if (txq != NULL) {
                        txq->ops->release_mbufs(txq);
                        txq->ops->reset(txq);
                }
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                struct ixgbe_rx_queue *rxq = dev->data->rx_queues[i];
                if (rxq != NULL) {
                        ixgbe_rx_queue_release_mbufs(rxq);
                        ixgbe_reset_rx_queue(adapter, rxq);
                }
        }
}

/*********************************************************************
 *
 *  Device RX/TX init functions
 *
 **********************************************************************/

/**
 * Receive Side Scaling (RSS)
 * See section 7.1.2.8 in the following document:
 *     "Intel 82599 10 GbE Controller Datasheet" - Revision 2.1 October 2009
 *
 * Principles:
 * The source and destination IP addresses of the IP header and the source
 * and destination ports of TCP/UDP headers, if any, of received packets are
 * hashed against a configurable random key to compute a 32-bit RSS hash result.
 * The seven (7) LSBs of the 32-bit hash result are used as an index into a
 * 128-entry redirection table (RETA).  Each entry of the RETA provides a 3-bit
 * RSS output index which is used as the RX queue index where to store the
 * received packets.
 * The following output is supplied in the RX write-back descriptor:
 *     - 32-bit result of the Microsoft RSS hash function,
 *     - 4-bit RSS type field.
 */

/*
 * RSS random key supplied in section 7.1.2.8.3 of the Intel 82599 datasheet.
 * Used as the default key.
 */
static uint8_t rss_intel_key[40] = {
        0x6D, 0x5A, 0x56, 0xDA, 0x25, 0x5B, 0x0E, 0xC2,
        0x41, 0x67, 0x25, 0x3D, 0x43, 0xA3, 0x8F, 0xB0,
        0xD0, 0xCA, 0x2B, 0xCB, 0xAE, 0x7B, 0x30, 0xB4,
        0x77, 0xCB, 0x2D, 0xA3, 0x80, 0x30, 0xF2, 0x0C,
        0x6A, 0x42, 0xB7, 0x3B, 0xBE, 0xAC, 0x01, 0xFA,
};

static void
ixgbe_rss_disable(struct rte_eth_dev *dev)
{
        struct ixgbe_hw *hw;
        uint32_t mrqc;

        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        mrqc = IXGBE_READ_REG(hw, IXGBE_MRQC);
        mrqc &= ~IXGBE_MRQC_RSSEN;
        IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
}

static void
ixgbe_hw_rss_hash_set(struct ixgbe_hw *hw, struct rte_eth_rss_conf *rss_conf)
{
        uint8_t  *hash_key;
        uint32_t mrqc;
        uint32_t rss_key;
        uint64_t rss_hf;
        uint16_t i;

        hash_key = rss_conf->rss_key;
        if (hash_key != NULL) {
                /* Fill in RSS hash key */
                for (i = 0; i < 10; i++) {
                        rss_key  = hash_key[(i * 4)];
                        rss_key |= hash_key[(i * 4) + 1] << 8;
                        rss_key |= hash_key[(i * 4) + 2] << 16;
                        rss_key |= hash_key[(i * 4) + 3] << 24;
                        IXGBE_WRITE_REG_ARRAY(hw, IXGBE_RSSRK(0), i, rss_key);
                }
        }

        /* Set configured hashing protocols in MRQC register */
        rss_hf = rss_conf->rss_hf;
        mrqc = IXGBE_MRQC_RSSEN; /* Enable RSS */
        if (rss_hf & ETH_RSS_IPV4)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV4;
        if (rss_hf & ETH_RSS_NONFRAG_IPV4_TCP)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV4_TCP;
        if (rss_hf & ETH_RSS_IPV6)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6;
        if (rss_hf & ETH_RSS_IPV6_EX)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6_EX;
        if (rss_hf & ETH_RSS_NONFRAG_IPV6_TCP)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6_TCP;
        if (rss_hf & ETH_RSS_IPV6_TCP_EX)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6_EX_TCP;
        if (rss_hf & ETH_RSS_NONFRAG_IPV4_UDP)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV4_UDP;
        if (rss_hf & ETH_RSS_NONFRAG_IPV6_UDP)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6_UDP;
        if (rss_hf & ETH_RSS_IPV6_UDP_EX)
                mrqc |= IXGBE_MRQC_RSS_FIELD_IPV6_EX_UDP;
        IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
}

int
ixgbe_dev_rss_hash_update(struct rte_eth_dev *dev,
                          struct rte_eth_rss_conf *rss_conf)
{
        struct ixgbe_hw *hw;
        uint32_t mrqc;
        uint64_t rss_hf;

        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /*
         * Excerpt from section 7.1.2.8 Receive-Side Scaling (RSS):
         *     "RSS enabling cannot be done dynamically while it must be
         *      preceded by a software reset"
         * Before changing anything, first check that the update RSS operation
         * does not attempt to disable RSS, if RSS was enabled at
         * initialization time, or does not attempt to enable RSS, if RSS was
         * disabled at initialization time.
         */
        rss_hf = rss_conf->rss_hf & IXGBE_RSS_OFFLOAD_ALL;
        mrqc = IXGBE_READ_REG(hw, IXGBE_MRQC);
        if (!(mrqc & IXGBE_MRQC_RSSEN)) { /* RSS disabled */
                if (rss_hf != 0) /* Enable RSS */
                        return -(EINVAL);
                return 0; /* Nothing to do */
        }
        /* RSS enabled */
        if (rss_hf == 0) /* Disable RSS */
                return -(EINVAL);
        ixgbe_hw_rss_hash_set(hw, rss_conf);
        return 0;
}

int
ixgbe_dev_rss_hash_conf_get(struct rte_eth_dev *dev,
                            struct rte_eth_rss_conf *rss_conf)
{
        struct ixgbe_hw *hw;
        uint8_t *hash_key;
        uint32_t mrqc;
        uint32_t rss_key;
        uint64_t rss_hf;
        uint16_t i;

        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        hash_key = rss_conf->rss_key;
        if (hash_key != NULL) {
                /* Return RSS hash key */
                for (i = 0; i < 10; i++) {
                        rss_key = IXGBE_READ_REG_ARRAY(hw, IXGBE_RSSRK(0), i);
                        hash_key[(i * 4)] = rss_key & 0x000000FF;
                        hash_key[(i * 4) + 1] = (rss_key >> 8) & 0x000000FF;
                        hash_key[(i * 4) + 2] = (rss_key >> 16) & 0x000000FF;
                        hash_key[(i * 4) + 3] = (rss_key >> 24) & 0x000000FF;
                }
        }

        /* Get RSS functions configured in MRQC register */
        mrqc = IXGBE_READ_REG(hw, IXGBE_MRQC);
        if ((mrqc & IXGBE_MRQC_RSSEN) == 0) { /* RSS is disabled */
                rss_conf->rss_hf = 0;
                return 0;
        }
        rss_hf = 0;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV4)
                rss_hf |= ETH_RSS_IPV4;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV4_TCP)
                rss_hf |= ETH_RSS_NONFRAG_IPV4_TCP;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6)
                rss_hf |= ETH_RSS_IPV6;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6_EX)
                rss_hf |= ETH_RSS_IPV6_EX;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6_TCP)
                rss_hf |= ETH_RSS_NONFRAG_IPV6_TCP;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6_EX_TCP)
                rss_hf |= ETH_RSS_IPV6_TCP_EX;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV4_UDP)
                rss_hf |= ETH_RSS_NONFRAG_IPV4_UDP;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6_UDP)
                rss_hf |= ETH_RSS_NONFRAG_IPV6_UDP;
        if (mrqc & IXGBE_MRQC_RSS_FIELD_IPV6_EX_UDP)
                rss_hf |= ETH_RSS_IPV6_UDP_EX;
        rss_conf->rss_hf = rss_hf;
        return 0;
}

static void
ixgbe_rss_configure(struct rte_eth_dev *dev)
{
        struct rte_eth_rss_conf rss_conf;
        struct ixgbe_hw *hw;
        uint32_t reta;
        uint16_t i;
        uint16_t j;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /*
         * Fill in redirection table
         * The byte-swap is needed because NIC registers are in
         * little-endian order.
         */
        reta = 0;
        for (i = 0, j = 0; i < 128; i++, j++) {
                if (j == dev->data->nb_rx_queues)
                        j = 0;
                reta = (reta << 8) | j;
                if ((i & 3) == 3)
                        IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2),
                                        rte_bswap32(reta));
        }

        /*
         * Configure the RSS key and the RSS protocols used to compute
         * the RSS hash of input packets.
         */
        rss_conf = dev->data->dev_conf.rx_adv_conf.rss_conf;
        if ((rss_conf.rss_hf & IXGBE_RSS_OFFLOAD_ALL) == 0) {
                ixgbe_rss_disable(dev);
                return;
        }
        if (rss_conf.rss_key == NULL)
                rss_conf.rss_key = rss_intel_key; /* Default hash key */
        ixgbe_hw_rss_hash_set(hw, &rss_conf);
}

#define NUM_VFTA_REGISTERS 128
#define NIC_RX_BUFFER_SIZE 0x200

static void
ixgbe_vmdq_dcb_configure(struct rte_eth_dev *dev)
{
        struct rte_eth_vmdq_dcb_conf *cfg;
        struct ixgbe_hw *hw;
        enum rte_eth_nb_pools num_pools;
        uint32_t mrqc, vt_ctl, queue_mapping, vlanctrl;
        uint16_t pbsize;
        uint8_t nb_tcs; /* number of traffic classes */
        int i;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        cfg = &dev->data->dev_conf.rx_adv_conf.vmdq_dcb_conf;
        num_pools = cfg->nb_queue_pools;
        /* Check we have a valid number of pools */
        if (num_pools != ETH_16_POOLS && num_pools != ETH_32_POOLS) {
                ixgbe_rss_disable(dev);
                return;
        }
        /* 16 pools -> 8 traffic classes, 32 pools -> 4 traffic classes */
        nb_tcs = (uint8_t)(ETH_VMDQ_DCB_NUM_QUEUES / (int)num_pools);

        /*
         * RXPBSIZE
         * split rx buffer up into sections, each for 1 traffic class
         */
        pbsize = (uint16_t)(NIC_RX_BUFFER_SIZE / nb_tcs);
        for (i = 0 ; i < nb_tcs; i++) {
                uint32_t rxpbsize = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i));
                rxpbsize &= (~(0x3FF << IXGBE_RXPBSIZE_SHIFT));
                /* clear 10 bits. */
                rxpbsize |= (pbsize << IXGBE_RXPBSIZE_SHIFT); /* set value */
                IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpbsize);
        }
        /* zero alloc all unused TCs */
        for (i = nb_tcs; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                uint32_t rxpbsize = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i));
                rxpbsize &= (~( 0x3FF << IXGBE_RXPBSIZE_SHIFT ));
                /* clear 10 bits. */
                IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpbsize);
        }

        /* MRQC: enable vmdq and dcb */
        mrqc = ((num_pools == ETH_16_POOLS) ? \
                IXGBE_MRQC_VMDQRT8TCEN : IXGBE_MRQC_VMDQRT4TCEN );
        IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);

        /* PFVTCTL: turn on virtualisation and set the default pool */
        vt_ctl = IXGBE_VT_CTL_VT_ENABLE | IXGBE_VT_CTL_REPLEN;
        if (cfg->enable_default_pool) {
                vt_ctl |= (cfg->default_pool << IXGBE_VT_CTL_POOL_SHIFT);
        } else {
                vt_ctl |= IXGBE_VT_CTL_DIS_DEFPL;
        }

        IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, vt_ctl);

        /* RTRUP2TC: mapping user priorities to traffic classes (TCs) */
        queue_mapping = 0;
        for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++)
                /*
                 * mapping is done with 3 bits per priority,
                 * so shift by i*3 each time
                 */
                queue_mapping |= ((cfg->dcb_queue[i] & 0x07) << (i * 3));

        IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, queue_mapping);

        /* RTRPCS: DCB related */
        IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, IXGBE_RMCS_RRM);

        /* VLNCTRL: enable vlan filtering and allow all vlan tags through */
        vlanctrl = IXGBE_READ_REG(hw, IXGBE_VLNCTRL);
        vlanctrl |= IXGBE_VLNCTRL_VFE ; /* enable vlan filters */
        IXGBE_WRITE_REG(hw, IXGBE_VLNCTRL, vlanctrl);

        /* VFTA - enable all vlan filters */
        for (i = 0; i < NUM_VFTA_REGISTERS; i++) {
                IXGBE_WRITE_REG(hw, IXGBE_VFTA(i), 0xFFFFFFFF);
        }

        /* VFRE: pool enabling for receive - 16 or 32 */
        IXGBE_WRITE_REG(hw, IXGBE_VFRE(0), \
                        num_pools == ETH_16_POOLS ? 0xFFFF : 0xFFFFFFFF);

        /*
         * MPSAR - allow pools to read specific mac addresses
         * In this case, all pools should be able to read from mac addr 0
         */
        IXGBE_WRITE_REG(hw, IXGBE_MPSAR_LO(0), 0xFFFFFFFF);
        IXGBE_WRITE_REG(hw, IXGBE_MPSAR_HI(0), 0xFFFFFFFF);

        /* PFVLVF, PFVLVFB: set up filters for vlan tags as configured */
        for (i = 0; i < cfg->nb_pool_maps; i++) {
                /* set vlan id in VF register and set the valid bit */
                IXGBE_WRITE_REG(hw, IXGBE_VLVF(i), (IXGBE_VLVF_VIEN | \
                                (cfg->pool_map[i].vlan_id & 0xFFF)));
                /*
                 * Put the allowed pools in VFB reg. As we only have 16 or 32
                 * pools, we only need to use the first half of the register
                 * i.e. bits 0-31
                 */
                IXGBE_WRITE_REG(hw, IXGBE_VLVFB(i*2), cfg->pool_map[i].pools);
        }
}

/**
 * ixgbe_dcb_config_tx_hw_config - Configure general DCB TX parameters
 * @hw: pointer to hardware structure
 * @dcb_config: pointer to ixgbe_dcb_config structure
 */
static void
ixgbe_dcb_tx_hw_config(struct ixgbe_hw *hw,
               struct ixgbe_dcb_config *dcb_config)
{
        uint32_t reg;
        uint32_t q;

        PMD_INIT_FUNC_TRACE();
        if (hw->mac.type != ixgbe_mac_82598EB) {
                /* Disable the Tx desc arbiter so that MTQC can be changed */
                reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
                reg |= IXGBE_RTTDCS_ARBDIS;
                IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

                /* Enable DCB for Tx with 8 TCs */
                if (dcb_config->num_tcs.pg_tcs == 8) {
                        reg = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_8TC_8TQ;
                }
                else {
                        reg = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_4TC_4TQ;
                }
                if (dcb_config->vt_mode)
                    reg |= IXGBE_MTQC_VT_ENA;
                IXGBE_WRITE_REG(hw, IXGBE_MTQC, reg);

                /* Disable drop for all queues */
                for (q = 0; q < 128; q++)
                        IXGBE_WRITE_REG(hw, IXGBE_QDE,
                     (IXGBE_QDE_WRITE | (q << IXGBE_QDE_IDX_SHIFT)));

                /* Enable the Tx desc arbiter */
                reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
                reg &= ~IXGBE_RTTDCS_ARBDIS;
                IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

                /* Enable Security TX Buffer IFG for DCB */
                reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
                reg |= IXGBE_SECTX_DCB;
                IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
        }
        return;
}

/**
 * ixgbe_vmdq_dcb_hw_tx_config - Configure general VMDQ+DCB TX parameters
 * @dev: pointer to rte_eth_dev structure
 * @dcb_config: pointer to ixgbe_dcb_config structure
 */
static void
ixgbe_vmdq_dcb_hw_tx_config(struct rte_eth_dev *dev,
                        struct ixgbe_dcb_config *dcb_config)
{
        struct rte_eth_vmdq_dcb_tx_conf *vmdq_tx_conf =
                        &dev->data->dev_conf.tx_adv_conf.vmdq_dcb_tx_conf;
        struct ixgbe_hw *hw =
                        IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        PMD_INIT_FUNC_TRACE();
        if (hw->mac.type != ixgbe_mac_82598EB)
                /*PF VF Transmit Enable*/
                IXGBE_WRITE_REG(hw, IXGBE_VFTE(0),
                        vmdq_tx_conf->nb_queue_pools == ETH_16_POOLS ? 0xFFFF : 0xFFFFFFFF);

        /*Configure general DCB TX parameters*/
        ixgbe_dcb_tx_hw_config(hw,dcb_config);
        return;
}

static void
ixgbe_vmdq_dcb_rx_config(struct rte_eth_dev *dev,
                        struct ixgbe_dcb_config *dcb_config)
{
        struct rte_eth_vmdq_dcb_conf *vmdq_rx_conf =
                        &dev->data->dev_conf.rx_adv_conf.vmdq_dcb_conf;
        struct ixgbe_dcb_tc_config *tc;
        uint8_t i,j;

        /* convert rte_eth_conf.rx_adv_conf to struct ixgbe_dcb_config */
        if (vmdq_rx_conf->nb_queue_pools == ETH_16_POOLS ) {
                dcb_config->num_tcs.pg_tcs = ETH_8_TCS;
                dcb_config->num_tcs.pfc_tcs = ETH_8_TCS;
        }
        else {
                dcb_config->num_tcs.pg_tcs = ETH_4_TCS;
                dcb_config->num_tcs.pfc_tcs = ETH_4_TCS;
        }
        /* User Priority to Traffic Class mapping */
        for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                j = vmdq_rx_conf->dcb_queue[i];
                tc = &dcb_config->tc_config[j];
                tc->path[IXGBE_DCB_RX_CONFIG].up_to_tc_bitmap =
                                                (uint8_t)(1 << j);
        }
}

static void
ixgbe_dcb_vt_tx_config(struct rte_eth_dev *dev,
                        struct ixgbe_dcb_config *dcb_config)
{
        struct rte_eth_vmdq_dcb_tx_conf *vmdq_tx_conf =
                        &dev->data->dev_conf.tx_adv_conf.vmdq_dcb_tx_conf;
        struct ixgbe_dcb_tc_config *tc;
        uint8_t i,j;

        /* convert rte_eth_conf.rx_adv_conf to struct ixgbe_dcb_config */
        if (vmdq_tx_conf->nb_queue_pools == ETH_16_POOLS ) {
                dcb_config->num_tcs.pg_tcs = ETH_8_TCS;
                dcb_config->num_tcs.pfc_tcs = ETH_8_TCS;
        }
        else {
                dcb_config->num_tcs.pg_tcs = ETH_4_TCS;
                dcb_config->num_tcs.pfc_tcs = ETH_4_TCS;
        }

        /* User Priority to Traffic Class mapping */
        for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                j = vmdq_tx_conf->dcb_queue[i];
                tc = &dcb_config->tc_config[j];
                tc->path[IXGBE_DCB_TX_CONFIG].up_to_tc_bitmap =
                                                (uint8_t)(1 << j);
        }
        return;
}

static void
ixgbe_dcb_rx_config(struct rte_eth_dev *dev,
                struct ixgbe_dcb_config *dcb_config)
{
        struct rte_eth_dcb_rx_conf *rx_conf =
                        &dev->data->dev_conf.rx_adv_conf.dcb_rx_conf;
        struct ixgbe_dcb_tc_config *tc;
        uint8_t i,j;

        dcb_config->num_tcs.pg_tcs = (uint8_t)rx_conf->nb_tcs;
        dcb_config->num_tcs.pfc_tcs = (uint8_t)rx_conf->nb_tcs;

        /* User Priority to Traffic Class mapping */
        for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                j = rx_conf->dcb_queue[i];
                tc = &dcb_config->tc_config[j];
                tc->path[IXGBE_DCB_RX_CONFIG].up_to_tc_bitmap =
                                                (uint8_t)(1 << j);
        }
}

static void
ixgbe_dcb_tx_config(struct rte_eth_dev *dev,
                struct ixgbe_dcb_config *dcb_config)
{
        struct rte_eth_dcb_tx_conf *tx_conf =
                        &dev->data->dev_conf.tx_adv_conf.dcb_tx_conf;
        struct ixgbe_dcb_tc_config *tc;
        uint8_t i,j;

        dcb_config->num_tcs.pg_tcs = (uint8_t)tx_conf->nb_tcs;
        dcb_config->num_tcs.pfc_tcs = (uint8_t)tx_conf->nb_tcs;

        /* User Priority to Traffic Class mapping */
        for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                j = tx_conf->dcb_queue[i];
                tc = &dcb_config->tc_config[j];
                tc->path[IXGBE_DCB_TX_CONFIG].up_to_tc_bitmap =
                                                (uint8_t)(1 << j);
        }
}

/**
 * ixgbe_dcb_rx_hw_config - Configure general DCB RX HW parameters
 * @hw: pointer to hardware structure
 * @dcb_config: pointer to ixgbe_dcb_config structure
 */
static void
ixgbe_dcb_rx_hw_config(struct ixgbe_hw *hw,
               struct ixgbe_dcb_config *dcb_config)
{
        uint32_t reg;
        uint32_t vlanctrl;
        uint8_t i;

        PMD_INIT_FUNC_TRACE();
        /*
         * Disable the arbiter before changing parameters
         * (always enable recycle mode; WSP)
         */
        reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC | IXGBE_RTRPCS_ARBDIS;
        IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

        if (hw->mac.type != ixgbe_mac_82598EB) {
                reg = IXGBE_READ_REG(hw, IXGBE_MRQC);
                if (dcb_config->num_tcs.pg_tcs == 4) {
                        if (dcb_config->vt_mode)
                                reg = (reg & ~IXGBE_MRQC_MRQE_MASK) |
                                        IXGBE_MRQC_VMDQRT4TCEN;
                        else {
                                IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, 0);
                                reg = (reg & ~IXGBE_MRQC_MRQE_MASK) |
                                        IXGBE_MRQC_RT4TCEN;
                        }
                }
                if (dcb_config->num_tcs.pg_tcs == 8) {
                        if (dcb_config->vt_mode)
                                reg = (reg & ~IXGBE_MRQC_MRQE_MASK) |
                                        IXGBE_MRQC_VMDQRT8TCEN;
                        else {
                                IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, 0);
                                reg = (reg & ~IXGBE_MRQC_MRQE_MASK) |
                                        IXGBE_MRQC_RT8TCEN;
                        }
                }

                IXGBE_WRITE_REG(hw, IXGBE_MRQC, reg);
        }

        /* VLNCTRL: enable vlan filtering and allow all vlan tags through */
        vlanctrl = IXGBE_READ_REG(hw, IXGBE_VLNCTRL);
        vlanctrl |= IXGBE_VLNCTRL_VFE ; /* enable vlan filters */
        IXGBE_WRITE_REG(hw, IXGBE_VLNCTRL, vlanctrl);

        /* VFTA - enable all vlan filters */
        for (i = 0; i < NUM_VFTA_REGISTERS; i++) {
                IXGBE_WRITE_REG(hw, IXGBE_VFTA(i), 0xFFFFFFFF);
        }

        /*
         * Configure Rx packet plane (recycle mode; WSP) and
         * enable arbiter
         */
        reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC;
        IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

        return;
}

static void
ixgbe_dcb_hw_arbite_rx_config(struct ixgbe_hw *hw, uint16_t *refill,
                        uint16_t *max,uint8_t *bwg_id, uint8_t *tsa, uint8_t *map)
{
        switch (hw->mac.type) {
        case ixgbe_mac_82598EB:
                ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max, tsa);
                break;
        case ixgbe_mac_82599EB:
        case ixgbe_mac_X540:
        case ixgbe_mac_X550:
        case ixgbe_mac_X550EM_x:
                ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
                                                  tsa, map);
                break;
        default:
                break;
        }
}

static void
ixgbe_dcb_hw_arbite_tx_config(struct ixgbe_hw *hw, uint16_t *refill, uint16_t *max,
                            uint8_t *bwg_id, uint8_t *tsa, uint8_t *map)
{
        switch (hw->mac.type) {
        case ixgbe_mac_82598EB:
                ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max, bwg_id,tsa);
                ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max, bwg_id,tsa);
                break;
        case ixgbe_mac_82599EB:
        case ixgbe_mac_X540:
        case ixgbe_mac_X550:
        case ixgbe_mac_X550EM_x:
                ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max, bwg_id,tsa);
                ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id,tsa, map);
                break;
        default:
                break;
        }
}

#define DCB_RX_CONFIG  1
#define DCB_TX_CONFIG  1
#define DCB_TX_PB      1024
/**
 * ixgbe_dcb_hw_configure - Enable DCB and configure
 * general DCB in VT mode and non-VT mode parameters
 * @dev: pointer to rte_eth_dev structure
 * @dcb_config: pointer to ixgbe_dcb_config structure
 */
static int
ixgbe_dcb_hw_configure(struct rte_eth_dev *dev,
                        struct ixgbe_dcb_config *dcb_config)
{
        int     ret = 0;
        uint8_t i,pfc_en,nb_tcs;
        uint16_t pbsize;
        uint8_t config_dcb_rx = 0;
        uint8_t config_dcb_tx = 0;
        uint8_t tsa[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0};
        uint8_t bwgid[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0};
        uint16_t refill[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0};
        uint16_t max[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0};
        uint8_t map[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0};
        struct ixgbe_dcb_tc_config *tc;
        uint32_t max_frame = dev->data->mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
        struct ixgbe_hw *hw =
                        IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        switch(dev->data->dev_conf.rxmode.mq_mode){
        case ETH_MQ_RX_VMDQ_DCB:
                dcb_config->vt_mode = true;
                if (hw->mac.type != ixgbe_mac_82598EB) {
                        config_dcb_rx = DCB_RX_CONFIG;
                        /*
                         *get dcb and VT rx configuration parameters
                         *from rte_eth_conf
                         */
                        ixgbe_vmdq_dcb_rx_config(dev,dcb_config);
                        /*Configure general VMDQ and DCB RX parameters*/
                        ixgbe_vmdq_dcb_configure(dev);
                }
                break;
        case ETH_MQ_RX_DCB:
                dcb_config->vt_mode = false;
                config_dcb_rx = DCB_RX_CONFIG;
                /* Get dcb TX configuration parameters from rte_eth_conf */
                ixgbe_dcb_rx_config(dev,dcb_config);
                /*Configure general DCB RX parameters*/
                ixgbe_dcb_rx_hw_config(hw, dcb_config);
                break;
        default:
                PMD_INIT_LOG(ERR, "Incorrect DCB RX mode configuration");
                break;
        }
        switch (dev->data->dev_conf.txmode.mq_mode) {
        case ETH_MQ_TX_VMDQ_DCB:
                dcb_config->vt_mode = true;
                config_dcb_tx = DCB_TX_CONFIG;
                /* get DCB and VT TX configuration parameters from rte_eth_conf */
                ixgbe_dcb_vt_tx_config(dev,dcb_config);
                /*Configure general VMDQ and DCB TX parameters*/
                ixgbe_vmdq_dcb_hw_tx_config(dev,dcb_config);
                break;

        case ETH_MQ_TX_DCB:
                dcb_config->vt_mode = false;
                config_dcb_tx = DCB_TX_CONFIG;
                /*get DCB TX configuration parameters from rte_eth_conf*/
                ixgbe_dcb_tx_config(dev,dcb_config);
                /*Configure general DCB TX parameters*/
                ixgbe_dcb_tx_hw_config(hw, dcb_config);
                break;
        default:
                PMD_INIT_LOG(ERR, "Incorrect DCB TX mode configuration");
                break;
        }

        nb_tcs = dcb_config->num_tcs.pfc_tcs;
        /* Unpack map */
        ixgbe_dcb_unpack_map_cee(dcb_config, IXGBE_DCB_RX_CONFIG, map);
        if(nb_tcs == ETH_4_TCS) {
                /* Avoid un-configured priority mapping to TC0 */
                uint8_t j = 4;
                uint8_t mask = 0xFF;
                for (i = 0; i < ETH_DCB_NUM_USER_PRIORITIES - 4; i++)
                        mask = (uint8_t)(mask & (~ (1 << map[i])));
                for (i = 0; mask && (i < IXGBE_DCB_MAX_TRAFFIC_CLASS); i++) {
                        if ((mask & 0x1) && (j < ETH_DCB_NUM_USER_PRIORITIES))
                                map[j++] = i;
                        mask >>= 1;
                }
                /* Re-configure 4 TCs BW */
                for (i = 0; i < nb_tcs; i++) {
                        tc = &dcb_config->tc_config[i];
                        tc->path[IXGBE_DCB_TX_CONFIG].bwg_percent =
                                                (uint8_t)(100 / nb_tcs);
                        tc->path[IXGBE_DCB_RX_CONFIG].bwg_percent =
                                                (uint8_t)(100 / nb_tcs);
                }
                for (; i < IXGBE_DCB_MAX_TRAFFIC_CLASS; i++) {
                        tc = &dcb_config->tc_config[i];
                        tc->path[IXGBE_DCB_TX_CONFIG].bwg_percent = 0;
                        tc->path[IXGBE_DCB_RX_CONFIG].bwg_percent = 0;
                }
        }

        if(config_dcb_rx) {
                /* Set RX buffer size */
                pbsize = (uint16_t)(NIC_RX_BUFFER_SIZE / nb_tcs);
                uint32_t rxpbsize = pbsize << IXGBE_RXPBSIZE_SHIFT;
                for (i = 0 ; i < nb_tcs; i++) {
                        IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpbsize);
                }
                /* zero alloc all unused TCs */
                for (; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                        IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0);
                }
        }
        if(config_dcb_tx) {
                /* Only support an equally distributed Tx packet buffer strategy. */
                uint32_t txpktsize = IXGBE_TXPBSIZE_MAX / nb_tcs;
                uint32_t txpbthresh = (txpktsize / DCB_TX_PB) - IXGBE_TXPKT_SIZE_MAX;
                for (i = 0; i < nb_tcs; i++) {
                        IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), txpktsize);
                        IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), txpbthresh);
                }
                /* Clear unused TCs, if any, to zero buffer size*/
                for (; i < ETH_DCB_NUM_USER_PRIORITIES; i++) {
                        IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), 0);
                        IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), 0);
                }
        }

        /*Calculates traffic class credits*/
        ixgbe_dcb_calculate_tc_credits_cee(hw, dcb_config,max_frame,
                                IXGBE_DCB_TX_CONFIG);
        ixgbe_dcb_calculate_tc_credits_cee(hw, dcb_config,max_frame,
                                IXGBE_DCB_RX_CONFIG);

        if(config_dcb_rx) {
                /* Unpack CEE standard containers */
                ixgbe_dcb_unpack_refill_cee(dcb_config, IXGBE_DCB_RX_CONFIG, refill);
                ixgbe_dcb_unpack_max_cee(dcb_config, max);
                ixgbe_dcb_unpack_bwgid_cee(dcb_config, IXGBE_DCB_RX_CONFIG, bwgid);
                ixgbe_dcb_unpack_tsa_cee(dcb_config, IXGBE_DCB_RX_CONFIG, tsa);
                /* Configure PG(ETS) RX */
                ixgbe_dcb_hw_arbite_rx_config(hw,refill,max,bwgid,tsa,map);
        }

        if(config_dcb_tx) {
                /* Unpack CEE standard containers */
                ixgbe_dcb_unpack_refill_cee(dcb_config, IXGBE_DCB_TX_CONFIG, refill);
                ixgbe_dcb_unpack_max_cee(dcb_config, max);
                ixgbe_dcb_unpack_bwgid_cee(dcb_config, IXGBE_DCB_TX_CONFIG, bwgid);
                ixgbe_dcb_unpack_tsa_cee(dcb_config, IXGBE_DCB_TX_CONFIG, tsa);
                /* Configure PG(ETS) TX */
                ixgbe_dcb_hw_arbite_tx_config(hw,refill,max,bwgid,tsa,map);
        }

        /*Configure queue statistics registers*/
        ixgbe_dcb_config_tc_stats_82599(hw, dcb_config);

        /* Check if the PFC is supported */
        if(dev->data->dev_conf.dcb_capability_en & ETH_DCB_PFC_SUPPORT) {
                pbsize = (uint16_t) (NIC_RX_BUFFER_SIZE / nb_tcs);
                for (i = 0; i < nb_tcs; i++) {
                        /*
                        * If the TC count is 8,and the default high_water is 48,
                        * the low_water is 16 as default.
                        */
                        hw->fc.high_water[i] = (pbsize * 3 ) / 4;
                        hw->fc.low_water[i] = pbsize / 4;
                        /* Enable pfc for this TC */
                        tc = &dcb_config->tc_config[i];
                        tc->pfc = ixgbe_dcb_pfc_enabled;
                }
                ixgbe_dcb_unpack_pfc_cee(dcb_config, map, &pfc_en);
                if(dcb_config->num_tcs.pfc_tcs == ETH_4_TCS)
                        pfc_en &= 0x0F;
                ret = ixgbe_dcb_config_pfc(hw, pfc_en, map);
        }

        return ret;
}

/**
 * ixgbe_configure_dcb - Configure DCB  Hardware
 * @dev: pointer to rte_eth_dev
 */
void ixgbe_configure_dcb(struct rte_eth_dev *dev)
{
        struct ixgbe_dcb_config *dcb_cfg =
                        IXGBE_DEV_PRIVATE_TO_DCB_CFG(dev->data->dev_private);
        struct rte_eth_conf *dev_conf = &(dev->data->dev_conf);

        PMD_INIT_FUNC_TRACE();

        /* check support mq_mode for DCB */
        if ((dev_conf->rxmode.mq_mode != ETH_MQ_RX_VMDQ_DCB) &&
            (dev_conf->rxmode.mq_mode != ETH_MQ_RX_DCB))
                return;

        if (dev->data->nb_rx_queues != ETH_DCB_NUM_QUEUES)
                return;

        /** Configure DCB hardware **/
        ixgbe_dcb_hw_configure(dev,dcb_cfg);

        return;
}

/*
 * VMDq only support for 10 GbE NIC.
 */
static void
ixgbe_vmdq_rx_hw_configure(struct rte_eth_dev *dev)
{
        struct rte_eth_vmdq_rx_conf *cfg;
        struct ixgbe_hw *hw;
        enum rte_eth_nb_pools num_pools;
        uint32_t mrqc, vt_ctl, vlanctrl;
        uint32_t vmolr = 0;
        int i;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        cfg = &dev->data->dev_conf.rx_adv_conf.vmdq_rx_conf;
        num_pools = cfg->nb_queue_pools;

        ixgbe_rss_disable(dev);

        /* MRQC: enable vmdq */
        mrqc = IXGBE_MRQC_VMDQEN;
        IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);

        /* PFVTCTL: turn on virtualisation and set the default pool */
        vt_ctl = IXGBE_VT_CTL_VT_ENABLE | IXGBE_VT_CTL_REPLEN;
        if (cfg->enable_default_pool)
                vt_ctl |= (cfg->default_pool << IXGBE_VT_CTL_POOL_SHIFT);
        else
                vt_ctl |= IXGBE_VT_CTL_DIS_DEFPL;

        IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, vt_ctl);

        for (i = 0; i < (int)num_pools; i++) {
                vmolr = ixgbe_convert_vm_rx_mask_to_val(cfg->rx_mode, vmolr);
                IXGBE_WRITE_REG(hw, IXGBE_VMOLR(i), vmolr);
        }

        /* VLNCTRL: enable vlan filtering and allow all vlan tags through */
        vlanctrl = IXGBE_READ_REG(hw, IXGBE_VLNCTRL);
        vlanctrl |= IXGBE_VLNCTRL_VFE ; /* enable vlan filters */
        IXGBE_WRITE_REG(hw, IXGBE_VLNCTRL, vlanctrl);

        /* VFTA - enable all vlan filters */
        for (i = 0; i < NUM_VFTA_REGISTERS; i++)
                IXGBE_WRITE_REG(hw, IXGBE_VFTA(i), UINT32_MAX);

        /* VFRE: pool enabling for receive - 64 */
        IXGBE_WRITE_REG(hw, IXGBE_VFRE(0), UINT32_MAX);
        if (num_pools == ETH_64_POOLS)
                IXGBE_WRITE_REG(hw, IXGBE_VFRE(1), UINT32_MAX);

        /*
         * MPSAR - allow pools to read specific mac addresses
         * In this case, all pools should be able to read from mac addr 0
         */
        IXGBE_WRITE_REG(hw, IXGBE_MPSAR_LO(0), UINT32_MAX);
        IXGBE_WRITE_REG(hw, IXGBE_MPSAR_HI(0), UINT32_MAX);

        /* PFVLVF, PFVLVFB: set up filters for vlan tags as configured */
        for (i = 0; i < cfg->nb_pool_maps; i++) {
                /* set vlan id in VF register and set the valid bit */
                IXGBE_WRITE_REG(hw, IXGBE_VLVF(i), (IXGBE_VLVF_VIEN | \
                                (cfg->pool_map[i].vlan_id & IXGBE_RXD_VLAN_ID_MASK)));
                /*
                 * Put the allowed pools in VFB reg. As we only have 16 or 64
                 * pools, we only need to use the first half of the register
                 * i.e. bits 0-31
                 */
                if (((cfg->pool_map[i].pools >> 32) & UINT32_MAX) == 0)
                        IXGBE_WRITE_REG(hw, IXGBE_VLVFB(i*2), \
                                        (cfg->pool_map[i].pools & UINT32_MAX));
                else
                        IXGBE_WRITE_REG(hw, IXGBE_VLVFB((i*2+1)), \
                                        ((cfg->pool_map[i].pools >> 32) \
                                        & UINT32_MAX));

        }

        /* PFDMA Tx General Switch Control Enables VMDQ loopback */
        if (cfg->enable_loop_back) {
                IXGBE_WRITE_REG(hw, IXGBE_PFDTXGSWC, IXGBE_PFDTXGSWC_VT_LBEN);
                for (i = 0; i < RTE_IXGBE_VMTXSW_REGISTER_COUNT; i++)
                        IXGBE_WRITE_REG(hw, IXGBE_VMTXSW(i), UINT32_MAX);
        }

        IXGBE_WRITE_FLUSH(hw);
}

/*
 * ixgbe_dcb_config_tx_hw_config - Configure general VMDq TX parameters
 * @hw: pointer to hardware structure
 */
static void
ixgbe_vmdq_tx_hw_configure(struct ixgbe_hw *hw)
{
        uint32_t reg;
        uint32_t q;

        PMD_INIT_FUNC_TRACE();
        /*PF VF Transmit Enable*/
        IXGBE_WRITE_REG(hw, IXGBE_VFTE(0), UINT32_MAX);
        IXGBE_WRITE_REG(hw, IXGBE_VFTE(1), UINT32_MAX);

        /* Disable the Tx desc arbiter so that MTQC can be changed */
        reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
        reg |= IXGBE_RTTDCS_ARBDIS;
        IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

        reg = IXGBE_MTQC_VT_ENA | IXGBE_MTQC_64VF;
        IXGBE_WRITE_REG(hw, IXGBE_MTQC, reg);

        /* Disable drop for all queues */
        for (q = 0; q < IXGBE_MAX_RX_QUEUE_NUM; q++)
                IXGBE_WRITE_REG(hw, IXGBE_QDE,
                  (IXGBE_QDE_WRITE | (q << IXGBE_QDE_IDX_SHIFT)));

        /* Enable the Tx desc arbiter */
        reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
        reg &= ~IXGBE_RTTDCS_ARBDIS;
        IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

        IXGBE_WRITE_FLUSH(hw);

        return;
}

static int
ixgbe_alloc_rx_queue_mbufs(struct ixgbe_rx_queue *rxq)
{
        struct ixgbe_rx_entry *rxe = rxq->sw_ring;
        uint64_t dma_addr;
        unsigned i;

        /* Initialize software ring entries */
        for (i = 0; i < rxq->nb_rx_desc; i++) {
                volatile union ixgbe_adv_rx_desc *rxd;
                struct rte_mbuf *mbuf = rte_rxmbuf_alloc(rxq->mb_pool);
                if (mbuf == NULL) {
                        PMD_INIT_LOG(ERR, "RX mbuf alloc failed queue_id=%u",
                                     (unsigned) rxq->queue_id);
                        return (-ENOMEM);
                }

                rte_mbuf_refcnt_set(mbuf, 1);
                mbuf->next = NULL;
                mbuf->data_off = RTE_PKTMBUF_HEADROOM;
                mbuf->nb_segs = 1;
                mbuf->port = rxq->port_id;

                dma_addr =
                        rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mbuf));
                rxd = &rxq->rx_ring[i];
                rxd->read.hdr_addr = dma_addr;
                rxd->read.pkt_addr = dma_addr;
                rxe[i].mbuf = mbuf;
        }

        return 0;
}

static int
ixgbe_config_vf_rss(struct rte_eth_dev *dev)
{
        struct ixgbe_hw *hw;
        uint32_t mrqc;

        ixgbe_rss_configure(dev);

        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /* MRQC: enable VF RSS */
        mrqc = IXGBE_READ_REG(hw, IXGBE_MRQC);
        mrqc &= ~IXGBE_MRQC_MRQE_MASK;
        switch (RTE_ETH_DEV_SRIOV(dev).active) {
        case ETH_64_POOLS:
                mrqc |= IXGBE_MRQC_VMDQRSS64EN;
                break;

        case ETH_32_POOLS:
                mrqc |= IXGBE_MRQC_VMDQRSS32EN;
                break;

        default:
                PMD_INIT_LOG(ERR, "Invalid pool number in IOV mode with VMDQ RSS");
                return -EINVAL;
        }

        IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);

        return 0;
}

static int
ixgbe_config_vf_default(struct rte_eth_dev *dev)
{
        struct ixgbe_hw *hw =
                IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        switch (RTE_ETH_DEV_SRIOV(dev).active) {
        case ETH_64_POOLS:
                IXGBE_WRITE_REG(hw, IXGBE_MRQC,
                        IXGBE_MRQC_VMDQEN);
                break;

        case ETH_32_POOLS:
                IXGBE_WRITE_REG(hw, IXGBE_MRQC,
                        IXGBE_MRQC_VMDQRT4TCEN);
                break;

        case ETH_16_POOLS:
                IXGBE_WRITE_REG(hw, IXGBE_MRQC,
                        IXGBE_MRQC_VMDQRT8TCEN);
                break;
        default:
                PMD_INIT_LOG(ERR,
                        "invalid pool number in IOV mode");
                break;
        }
        return 0;
}

static int
ixgbe_dev_mq_rx_configure(struct rte_eth_dev *dev)
{
        struct ixgbe_hw *hw =
                IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (hw->mac.type == ixgbe_mac_82598EB)
                return 0;

        if (RTE_ETH_DEV_SRIOV(dev).active == 0) {
                /*
                 * SRIOV inactive scheme
                 * any DCB/RSS w/o VMDq multi-queue setting
                 */
                switch (dev->data->dev_conf.rxmode.mq_mode) {
                        case ETH_MQ_RX_RSS:
                                ixgbe_rss_configure(dev);
                                break;

                        case ETH_MQ_RX_VMDQ_DCB:
                                ixgbe_vmdq_dcb_configure(dev);
                                break;

                        case ETH_MQ_RX_VMDQ_ONLY:
                                ixgbe_vmdq_rx_hw_configure(dev);
                                break;

                        case ETH_MQ_RX_NONE:
                                /* if mq_mode is none, disable rss mode.*/
                        default: ixgbe_rss_disable(dev);
                }
        } else {
                /*
                 * SRIOV active scheme
                 * Support RSS together with VMDq & SRIOV
                 */
                switch (dev->data->dev_conf.rxmode.mq_mode) {
                case ETH_MQ_RX_RSS:
                case ETH_MQ_RX_VMDQ_RSS:
                        ixgbe_config_vf_rss(dev);
                        break;

                /* FIXME if support DCB/RSS together with VMDq & SRIOV */
                case ETH_MQ_RX_VMDQ_DCB:
                case ETH_MQ_RX_VMDQ_DCB_RSS:
                        PMD_INIT_LOG(ERR,
                                "Could not support DCB with VMDq & SRIOV");
                        return -1;
                default:
                        ixgbe_config_vf_default(dev);
                        break;
                }
        }

        return 0;
}

static int
ixgbe_dev_mq_tx_configure(struct rte_eth_dev *dev)
{
        struct ixgbe_hw *hw =
                IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        uint32_t mtqc;
        uint32_t rttdcs;

        if (hw->mac.type == ixgbe_mac_82598EB)
                return 0;

        /* disable arbiter before setting MTQC */
        rttdcs = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
        rttdcs |= IXGBE_RTTDCS_ARBDIS;
        IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, rttdcs);

        if (RTE_ETH_DEV_SRIOV(dev).active == 0) {
                /*
                 * SRIOV inactive scheme
                 * any DCB w/o VMDq multi-queue setting
                 */
                if (dev->data->dev_conf.txmode.mq_mode == ETH_MQ_TX_VMDQ_ONLY)
                        ixgbe_vmdq_tx_hw_configure(hw);
                else {
                        mtqc = IXGBE_MTQC_64Q_1PB;
                        IXGBE_WRITE_REG(hw, IXGBE_MTQC, mtqc);
                }
        } else {
                switch (RTE_ETH_DEV_SRIOV(dev).active) {

                /*
                 * SRIOV active scheme
                 * FIXME if support DCB together with VMDq & SRIOV
                 */
                case ETH_64_POOLS:
                        mtqc = IXGBE_MTQC_VT_ENA | IXGBE_MTQC_64VF;
                        break;
                case ETH_32_POOLS:
                        mtqc = IXGBE_MTQC_VT_ENA | IXGBE_MTQC_32VF;
                        break;
                case ETH_16_POOLS:
                        mtqc = IXGBE_MTQC_VT_ENA | IXGBE_MTQC_RT_ENA |
                                IXGBE_MTQC_8TC_8TQ;
                        break;
                default:
                        mtqc = IXGBE_MTQC_64Q_1PB;
                        PMD_INIT_LOG(ERR, "invalid pool number in IOV mode");
                }
                IXGBE_WRITE_REG(hw, IXGBE_MTQC, mtqc);
        }

        /* re-enable arbiter */
        rttdcs &= ~IXGBE_RTTDCS_ARBDIS;
        IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, rttdcs);

        return 0;
}

/**
 * ixgbe_get_rscctl_maxdesc - Calculate the RSCCTL[n].MAXDESC for PF
 *
 * Return the RSCCTL[n].MAXDESC for 82599 and x540 PF devices according to the
 * spec rev. 3.0 chapter 8.2.3.8.13.
 *
 * @pool Memory pool of the Rx queue
 */
static inline uint32_t
ixgbe_get_rscctl_maxdesc(struct rte_mempool *pool)
{
        struct rte_pktmbuf_pool_private *mp_priv = rte_mempool_get_priv(pool);

        /* MAXDESC * SRRCTL.BSIZEPKT must not exceed 64 KB minus one */
        uint16_t maxdesc =
                IPV4_MAX_PKT_LEN /
                        (mp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM);

        if (maxdesc >= 16)
                return IXGBE_RSCCTL_MAXDESC_16;
        else if (maxdesc >= 8)
                return IXGBE_RSCCTL_MAXDESC_8;
        else if (maxdesc >= 4)
                return IXGBE_RSCCTL_MAXDESC_4;
        else
                return IXGBE_RSCCTL_MAXDESC_1;
}

/**
 * ixgbe_set_ivar - Setup the correct IVAR register for a particular MSIX
 * interrupt
 *
 * (Taken from FreeBSD tree)
 * (yes this is all very magic and confusing :)
 *
 * @dev port handle
 * @entry the register array entry
 * @vector the MSIX vector for this queue
 * @type RX/TX/MISC
 */
static void
ixgbe_set_ivar(struct rte_eth_dev *dev, u8 entry, u8 vector, s8 type)
{
        struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        u32 ivar, index;

        vector |= IXGBE_IVAR_ALLOC_VAL;

        switch (hw->mac.type) {

        case ixgbe_mac_82598EB:
                if (type == -1)
                        entry = IXGBE_IVAR_OTHER_CAUSES_INDEX;
                else
                        entry += (type * 64);
                index = (entry >> 2) & 0x1F;
                ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(index));
                ivar &= ~(0xFF << (8 * (entry & 0x3)));
                ivar |= (vector << (8 * (entry & 0x3)));
                IXGBE_WRITE_REG(hw, IXGBE_IVAR(index), ivar);
                break;

        case ixgbe_mac_82599EB:
        case ixgbe_mac_X540:
                if (type == -1) { /* MISC IVAR */
                        index = (entry & 1) * 8;
                        ivar = IXGBE_READ_REG(hw, IXGBE_IVAR_MISC);
                        ivar &= ~(0xFF << index);
                        ivar |= (vector << index);
                        IXGBE_WRITE_REG(hw, IXGBE_IVAR_MISC, ivar);
                } else {        /* RX/TX IVARS */
                        index = (16 * (entry & 1)) + (8 * type);
                        ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(entry >> 1));
                        ivar &= ~(0xFF << index);
                        ivar |= (vector << index);
                        IXGBE_WRITE_REG(hw, IXGBE_IVAR(entry >> 1), ivar);
                }

                break;

        default:
                break;
        }
}

void ixgbe_set_rx_function(struct rte_eth_dev *dev)
{
        struct ixgbe_adapter *adapter =
                (struct ixgbe_adapter *)dev->data->dev_private;

        /*
         * In order to allow Vector Rx there are a few configuration
         * conditions to be met and Rx Bulk Allocation should be allowed.
         */
        if (ixgbe_rx_vec_dev_conf_condition_check(dev) ||
            !adapter->rx_bulk_alloc_allowed) {
                PMD_INIT_LOG(DEBUG, "Port[%d] doesn't meet Vector Rx "
                                    "preconditions or RTE_IXGBE_INC_VECTOR is "
                                    "not enabled",
                             dev->data->port_id);

                adapter->rx_vec_allowed = false;
        }

        /*
         * Initialize the appropriate LRO callback.
         *
         * If all queues satisfy the bulk allocation preconditions
         * (hw->rx_bulk_alloc_allowed is TRUE) then we may use bulk allocation.
         * Otherwise use a single allocation version.
         */
        if (dev->data->lro) {
                if (adapter->rx_bulk_alloc_allowed) {
                        PMD_INIT_LOG(INFO, "LRO is requested. Using a bulk "
                                           "allocation version");
                        dev->rx_pkt_burst = ixgbe_recv_pkts_lro_bulk_alloc;
                } else {
                        PMD_INIT_LOG(INFO, "LRO is requested. Using a single "
                                           "allocation version");
                        dev->rx_pkt_burst = ixgbe_recv_pkts_lro_single_alloc;
                }
        } else if (dev->data->scattered_rx) {
                /*
                 * Set the non-LRO scattered callback: there are Vector and
                 * single allocation versions.
                 */
                if (adapter->rx_vec_allowed) {
                        PMD_INIT_LOG(DEBUG, "Using Vector Scattered Rx "
                                            "callback (port=%d).",
                                     dev->data->port_id);

                        dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
                } else {
                        PMD_INIT_LOG(DEBUG, "Using Regualr (non-vector, "
                                            "single allocation) "
                                            "Scattered Rx callback "
                                            "(port=%d).",
                                     dev->data->port_id);

                        dev->rx_pkt_burst = ixgbe_recv_pkts_lro_single_alloc;
                }
        /*
         * Below we set "simple" callbacks according to port/queues parameters.
         * If parameters allow we are going to choose between the following
         * callbacks:
         *    - Vector
         *    - Bulk Allocation
         *    - Single buffer allocation (the simplest one)
         */
        } else if (adapter->rx_vec_allowed) {
                PMD_INIT_LOG(INFO, "Vector rx enabled, please make sure RX "
                                   "burst size no less than 32.");

                dev->rx_pkt_burst = ixgbe_recv_pkts_vec;
        } else if (adapter->rx_bulk_alloc_allowed) {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions are "
                                    "satisfied. Rx Burst Bulk Alloc function "
                                    "will be used on port=%d.",
                             dev->data->port_id);

                dev->rx_pkt_burst = ixgbe_recv_pkts_bulk_alloc;
        } else {
                PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions are not "
                                    "satisfied, or Scattered Rx is requested, "
                                    "or RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC "
                                    "is not enabled (port=%d).",
                             dev->data->port_id);

                dev->rx_pkt_burst = ixgbe_recv_pkts;
        }
}

/**
 * ixgbe_set_rsc - configure RSC related port HW registers
 *
 * Configures the port's RSC related registers according to the 4.6.7.2 chapter
 * of 82599 Spec (x540 configuration is virtually the same).
 *
 * @dev port handle
 *
 * Returns 0 in case of success or a non-zero error code
 */
static int
ixgbe_set_rsc(struct rte_eth_dev *dev)
{
        struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
        struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
        struct rte_eth_dev_info dev_info = { 0 };
        bool rsc_capable = false;
        uint16_t i;
        uint32_t rdrxctl;

        /* Sanity check */
        dev->dev_ops->dev_infos_get(dev, &dev_info);
        if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO)
                rsc_capable = true;

        if (!rsc_capable && rx_conf->enable_lro) {
                PMD_INIT_LOG(CRIT, "LRO is requested on HW that doesn't "
                                   "support it");
                return -EINVAL;
        }

        /* RSC global configuration (chapter 4.6.7.2.1 of 82599 Spec) */

        if (!rx_conf->hw_strip_crc && rx_conf->enable_lro) {
                /*
                 * According to chapter of 4.6.7.2.1 of the Spec Rev.
                 * 3.0 RSC configuration requires HW CRC stripping being
                 * enabled. If user requested both HW CRC stripping off
                 * and RSC on - return an error.
                 */
                PMD_INIT_LOG(CRIT, "LRO can't be enabled when HW CRC "
                                    "is disabled");
                return -EINVAL;
        }

        /* RFCTL configuration  */
        if (rsc_capable) {
                uint32_t rfctl = IXGBE_READ_REG(hw, IXGBE_RFCTL);
                if (rx_conf->enable_lro)
                        /*
                         * Since NFS packets coalescing is not supported - clear
                         * RFCTL.NFSW_DIS and RFCTL.NFSR_DIS when RSC is
                         * enabled.
                         */
                        rfctl &= ~(IXGBE_RFCTL_RSC_DIS | IXGBE_RFCTL_NFSW_DIS |
                                   IXGBE_RFCTL_NFSR_DIS);
                else
                        rfctl |= IXGBE_RFCTL_RSC_DIS;

                IXGBE_WRITE_REG(hw, IXGBE_RFCTL, rfctl);
        }

        /* If LRO hasn't been requested - we are done here. */
        if (!rx_conf->enable_lro)
                return 0;

        /* Set RDRXCTL.RSCACKC bit */
        rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
        rdrxctl |= IXGBE_RDRXCTL_RSCACKC;
        IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl);

        /* Per-queue RSC configuration (chapter 4.6.7.2.2 of 82599 Spec) */
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                struct ixgbe_rx_queue *rxq = dev->data->rx_queues[i];
                uint32_t srrctl =
                        IXGBE_READ_REG(hw, IXGBE_SRRCTL(rxq->reg_idx));
                uint32_t rscctl =
                        IXGBE_READ_REG(hw, IXGBE_RSCCTL(rxq->reg_idx));
                uint32_t psrtype =
                        IXGBE_READ_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx));
                uint32_t eitr =
                        IXGBE_READ_REG(hw, IXGBE_EITR(rxq->reg_idx));

                /*
                 * ixgbe PMD doesn't support header-split at the moment.
                 *
                 * Following the 4.6.7.2.1 chapter of the 82599/x540
                 * Spec if RSC is enabled the SRRCTL[n].BSIZEHEADER
                 * should be configured even if header split is not
                 * enabled. We will configure it 128 bytes following the
                 * recommendation in the spec.
                 */
                srrctl &= ~IXGBE_SRRCTL_BSIZEHDR_MASK;
                srrctl |= (128 << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
                                            IXGBE_SRRCTL_BSIZEHDR_MASK;

                /*
                 * TODO: Consider setting the Receive Descriptor Minimum
                 * Threshold Size for an RSC case. This is not an obviously
                 * beneficiary option but the one worth considering...
                 */

                rscctl |= IXGBE_RSCCTL_RSCEN;
                rscctl |= ixgbe_get_rscctl_maxdesc(rxq->mb_pool);
                psrtype |= IXGBE_PSRTYPE_TCPHDR;

                /*
                 * RSC: Set ITR interval corresponding to 2K ints/s.
                 *
                 * Full-sized RSC aggregations for a 10Gb/s link will
                 * arrive at about 20K aggregation/s rate.
                 *
                 * 2K inst/s rate will make only 10% of the
                 * aggregations to be closed due to the interrupt timer
                 * expiration for a streaming at wire-speed case.
                 *
                 * For a sparse streaming case this setting will yield
                 * at most 500us latency for a single RSC aggregation.
                 */
                eitr &= ~IXGBE_EITR_ITR_INT_MASK;
                eitr |= IXGBE_EITR_INTERVAL_US(500) | IXGBE_EITR_CNT_WDIS;

                IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(rxq->reg_idx), srrctl);
                IXGBE_WRITE_REG(hw, IXGBE_RSCCTL(rxq->reg_idx), rscctl);
                IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), psrtype);
                IXGBE_WRITE_REG(hw, IXGBE_EITR(rxq->reg_idx), eitr);

                /*
                 * RSC requires the mapping of the queue to the
                 * interrupt vector.
                 */
                ixgbe_set_ivar(dev, rxq->reg_idx, i, 0);
        }

        dev->data->lro = 1;

        PMD_INIT_LOG(INFO, "enabling LRO mode");

        return 0;
}

/*
 * Initializes Receive Unit.
 */
int
ixgbe_dev_rx_init(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_rx_queue *rxq;
        uint64_t bus_addr;
        uint32_t rxctrl;
        uint32_t fctrl;
        uint32_t hlreg0;
        uint32_t maxfrs;
        uint32_t srrctl;
        uint32_t rdrxctl;
        uint32_t rxcsum;
        uint16_t buf_size;
        uint16_t i;
        struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
        int rc;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /*
         * Make sure receives are disabled while setting
         * up the RX context (registers, descriptor rings, etc.).
         */
        rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
        IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, rxctrl & ~IXGBE_RXCTRL_RXEN);

        /* Enable receipt of broadcasted frames */
        fctrl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
        fctrl |= IXGBE_FCTRL_BAM;
        fctrl |= IXGBE_FCTRL_DPF;
        fctrl |= IXGBE_FCTRL_PMCF;
        IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);

        /*
         * Configure CRC stripping, if any.
         */
        hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
        if (rx_conf->hw_strip_crc)
                hlreg0 |= IXGBE_HLREG0_RXCRCSTRP;
        else
                hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP;

        /*
         * Configure jumbo frame support, if any.
         */
        if (rx_conf->jumbo_frame == 1) {
                hlreg0 |= IXGBE_HLREG0_JUMBOEN;
                maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
                maxfrs &= 0x0000FFFF;
                maxfrs |= (rx_conf->max_rx_pkt_len << 16);
                IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);
        } else
                hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;

        /*
         * If loopback mode is configured for 82599, set LPBK bit.
         */
        if (hw->mac.type == ixgbe_mac_82599EB &&
                        dev->data->dev_conf.lpbk_mode == IXGBE_LPBK_82599_TX_RX)
                hlreg0 |= IXGBE_HLREG0_LPBK;
        else
                hlreg0 &= ~IXGBE_HLREG0_LPBK;

        IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);

        /* Setup RX queues */
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rxq = dev->data->rx_queues[i];

                /*
                 * Reset crc_len in case it was changed after queue setup by a
                 * call to configure.
                 */
                rxq->crc_len = rx_conf->hw_strip_crc ? 0 : ETHER_CRC_LEN;

                /* Setup the Base and Length of the Rx Descriptor Rings */
                bus_addr = rxq->rx_ring_phys_addr;
                IXGBE_WRITE_REG(hw, IXGBE_RDBAL(rxq->reg_idx),
                                (uint32_t)(bus_addr & 0x00000000ffffffffULL));
                IXGBE_WRITE_REG(hw, IXGBE_RDBAH(rxq->reg_idx),
                                (uint32_t)(bus_addr >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_RDLEN(rxq->reg_idx),
                                rxq->nb_rx_desc * sizeof(union ixgbe_adv_rx_desc));
                IXGBE_WRITE_REG(hw, IXGBE_RDH(rxq->reg_idx), 0);
                IXGBE_WRITE_REG(hw, IXGBE_RDT(rxq->reg_idx), 0);

                /* Configure the SRRCTL register */
#ifdef RTE_HEADER_SPLIT_ENABLE
                /*
                 * Configure Header Split
                 */
                if (rx_conf->header_split) {
                        if (hw->mac.type == ixgbe_mac_82599EB) {
                                /* Must setup the PSRTYPE register */
                                uint32_t psrtype;
                                psrtype = IXGBE_PSRTYPE_TCPHDR |
                                        IXGBE_PSRTYPE_UDPHDR   |
                                        IXGBE_PSRTYPE_IPV4HDR  |
                                        IXGBE_PSRTYPE_IPV6HDR;
                                IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), psrtype);
                        }
                        srrctl = ((rx_conf->split_hdr_size <<
                                IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
                                IXGBE_SRRCTL_BSIZEHDR_MASK);
                        srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
                } else
#endif
                        srrctl = IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;

                /* Set if packets are dropped when no descriptors available */
                if (rxq->drop_en)
                        srrctl |= IXGBE_SRRCTL_DROP_EN;

                /*
                 * Configure the RX buffer size in the BSIZEPACKET field of
                 * the SRRCTL register of the queue.
                 * The value is in 1 KB resolution. Valid values can be from
                 * 1 KB to 16 KB.
                 */
                buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mb_pool) -
                        RTE_PKTMBUF_HEADROOM);
                srrctl |= ((buf_size >> IXGBE_SRRCTL_BSIZEPKT_SHIFT) &
                           IXGBE_SRRCTL_BSIZEPKT_MASK);

                IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(rxq->reg_idx), srrctl);

                buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) <<
                                       IXGBE_SRRCTL_BSIZEPKT_SHIFT);

                /* It adds dual VLAN length for supporting dual VLAN */
                if (dev->data->dev_conf.rxmode.max_rx_pkt_len +
                                            2 * IXGBE_VLAN_TAG_SIZE > buf_size)
                        dev->data->scattered_rx = 1;
        }

        if (rx_conf->enable_scatter)
                dev->data->scattered_rx = 1;

        /*
         * Device configured with multiple RX queues.
         */
        ixgbe_dev_mq_rx_configure(dev);

        /*
         * Setup the Checksum Register.
         * Disable Full-Packet Checksum which is mutually exclusive with RSS.
         * Enable IP/L4 checkum computation by hardware if requested to do so.
         */
        rxcsum = IXGBE_READ_REG(hw, IXGBE_RXCSUM);
        rxcsum |= IXGBE_RXCSUM_PCSD;
        if (rx_conf->hw_ip_checksum)
                rxcsum |= IXGBE_RXCSUM_IPPCSE;
        else
                rxcsum &= ~IXGBE_RXCSUM_IPPCSE;

        IXGBE_WRITE_REG(hw, IXGBE_RXCSUM, rxcsum);

        if (hw->mac.type == ixgbe_mac_82599EB ||
            hw->mac.type == ixgbe_mac_X540) {
                rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
                if (rx_conf->hw_strip_crc)
                        rdrxctl |= IXGBE_RDRXCTL_CRCSTRIP;
                else
                        rdrxctl &= ~IXGBE_RDRXCTL_CRCSTRIP;
                rdrxctl &= ~IXGBE_RDRXCTL_RSCFRSTSIZE;
                IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl);
        }

        rc = ixgbe_set_rsc(dev);
        if (rc)
                return rc;

        ixgbe_set_rx_function(dev);

        return 0;
}

/*
 * Initializes Transmit Unit.
 */
void
ixgbe_dev_tx_init(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        uint64_t bus_addr;
        uint32_t hlreg0;
        uint32_t txctrl;
        uint16_t i;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /* Enable TX CRC (checksum offload requirement) and hw padding
         * (TSO requirement) */
        hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
        hlreg0 |= (IXGBE_HLREG0_TXCRCEN | IXGBE_HLREG0_TXPADEN);
        IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);

        /* Setup the Base and Length of the Tx Descriptor Rings */
        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                txq = dev->data->tx_queues[i];

                bus_addr = txq->tx_ring_phys_addr;
                IXGBE_WRITE_REG(hw, IXGBE_TDBAL(txq->reg_idx),
                                (uint32_t)(bus_addr & 0x00000000ffffffffULL));
                IXGBE_WRITE_REG(hw, IXGBE_TDBAH(txq->reg_idx),
                                (uint32_t)(bus_addr >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_TDLEN(txq->reg_idx),
                                txq->nb_tx_desc * sizeof(union ixgbe_adv_tx_desc));
                /* Setup the HW Tx Head and TX Tail descriptor pointers */
                IXGBE_WRITE_REG(hw, IXGBE_TDH(txq->reg_idx), 0);
                IXGBE_WRITE_REG(hw, IXGBE_TDT(txq->reg_idx), 0);

                /*
                 * Disable Tx Head Writeback RO bit, since this hoses
                 * bookkeeping if things aren't delivered in order.
                 */
                switch (hw->mac.type) {
                        case ixgbe_mac_82598EB:
                                txctrl = IXGBE_READ_REG(hw,
                                                        IXGBE_DCA_TXCTRL(txq->reg_idx));
                                txctrl &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
                                IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL(txq->reg_idx),
                                                txctrl);
                                break;

                        case ixgbe_mac_82599EB:
                        case ixgbe_mac_X540:
                        case ixgbe_mac_X550:
                        case ixgbe_mac_X550EM_x:
                        default:
                                txctrl = IXGBE_READ_REG(hw,
                                                IXGBE_DCA_TXCTRL_82599(txq->reg_idx));
                                txctrl &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
                                IXGBE_WRITE_REG(hw, IXGBE_DCA_TXCTRL_82599(txq->reg_idx),
                                                txctrl);
                                break;
                }
        }

        /* Device configured with multiple TX queues. */
        ixgbe_dev_mq_tx_configure(dev);
}

/*
 * Set up link for 82599 loopback mode Tx->Rx.
 */
static inline void
ixgbe_setup_loopback_link_82599(struct ixgbe_hw *hw)
{
        PMD_INIT_FUNC_TRACE();

        if (ixgbe_verify_lesm_fw_enabled_82599(hw)) {
                if (hw->mac.ops.acquire_swfw_sync(hw, IXGBE_GSSR_MAC_CSR_SM) !=
                                IXGBE_SUCCESS) {
                        PMD_INIT_LOG(ERR, "Could not enable loopback mode");
                        /* ignore error */
                        return;
                }
        }

        /* Restart link */
        IXGBE_WRITE_REG(hw,
                        IXGBE_AUTOC,
                        IXGBE_AUTOC_LMS_10G_LINK_NO_AN | IXGBE_AUTOC_FLU);
        ixgbe_reset_pipeline_82599(hw);

        hw->mac.ops.release_swfw_sync(hw, IXGBE_GSSR_MAC_CSR_SM);
        msec_delay(50);
}


/*
 * Start Transmit and Receive Units.
 */
int
ixgbe_dev_rxtx_start(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        struct ixgbe_rx_queue *rxq;
        uint32_t txdctl;
        uint32_t dmatxctl;
        uint32_t rxctrl;
        uint16_t i;
        int ret = 0;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                txq = dev->data->tx_queues[i];
                /* Setup Transmit Threshold Registers */
                txdctl = IXGBE_READ_REG(hw, IXGBE_TXDCTL(txq->reg_idx));
                txdctl |= txq->pthresh & 0x7F;
                txdctl |= ((txq->hthresh & 0x7F) << 8);
                txdctl |= ((txq->wthresh & 0x7F) << 16);
                IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(txq->reg_idx), txdctl);
        }

        if (hw->mac.type != ixgbe_mac_82598EB) {
                dmatxctl = IXGBE_READ_REG(hw, IXGBE_DMATXCTL);
                dmatxctl |= IXGBE_DMATXCTL_TE;
                IXGBE_WRITE_REG(hw, IXGBE_DMATXCTL, dmatxctl);
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                txq = dev->data->tx_queues[i];
                if (!txq->tx_deferred_start) {
                        ret = ixgbe_dev_tx_queue_start(dev, i);
                        if (ret < 0)
                                return ret;
                }
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rxq = dev->data->rx_queues[i];
                if (!rxq->rx_deferred_start) {
                        ret = ixgbe_dev_rx_queue_start(dev, i);
                        if (ret < 0)
                                return ret;
                }
        }

        /* Enable Receive engine */
        rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
        if (hw->mac.type == ixgbe_mac_82598EB)
                rxctrl |= IXGBE_RXCTRL_DMBYPS;
        rxctrl |= IXGBE_RXCTRL_RXEN;
        hw->mac.ops.enable_rx_dma(hw, rxctrl);

        /* If loopback mode is enabled for 82599, set up the link accordingly */
        if (hw->mac.type == ixgbe_mac_82599EB &&
                        dev->data->dev_conf.lpbk_mode == IXGBE_LPBK_82599_TX_RX)
                ixgbe_setup_loopback_link_82599(hw);

        return 0;
}

/*
 * Start Receive Units for specified queue.
 */
int
ixgbe_dev_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_rx_queue *rxq;
        uint32_t rxdctl;
        int poll_ms;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (rx_queue_id < dev->data->nb_rx_queues) {
                rxq = dev->data->rx_queues[rx_queue_id];

                /* Allocate buffers for descriptor rings */
                if (ixgbe_alloc_rx_queue_mbufs(rxq) != 0) {
                        PMD_INIT_LOG(ERR, "Could not alloc mbuf for queue:%d",
                                     rx_queue_id);
                        return -1;
                }
                rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(rxq->reg_idx));
                rxdctl |= IXGBE_RXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(rxq->reg_idx), rxdctl);

                /* Wait until RX Enable ready */
                poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_10_MS;
                do {
                        rte_delay_ms(1);
                        rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(rxq->reg_idx));
                } while (--poll_ms && !(rxdctl & IXGBE_RXDCTL_ENABLE));
                if (!poll_ms)
                        PMD_INIT_LOG(ERR, "Could not enable Rx Queue %d",
                                     rx_queue_id);
                rte_wmb();
                IXGBE_WRITE_REG(hw, IXGBE_RDH(rxq->reg_idx), 0);
                IXGBE_WRITE_REG(hw, IXGBE_RDT(rxq->reg_idx), rxq->nb_rx_desc - 1);
        } else
                return -1;

        return 0;
}

/*
 * Stop Receive Units for specified queue.
 */
int
ixgbe_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_adapter *adapter =
                (struct ixgbe_adapter *)dev->data->dev_private;
        struct ixgbe_rx_queue *rxq;
        uint32_t rxdctl;
        int poll_ms;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (rx_queue_id < dev->data->nb_rx_queues) {
                rxq = dev->data->rx_queues[rx_queue_id];

                rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(rxq->reg_idx));
                rxdctl &= ~IXGBE_RXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(rxq->reg_idx), rxdctl);

                /* Wait until RX Enable ready */
                poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_10_MS;
                do {
                        rte_delay_ms(1);
                        rxdctl = IXGBE_READ_REG(hw, IXGBE_RXDCTL(rxq->reg_idx));
                } while (--poll_ms && (rxdctl | IXGBE_RXDCTL_ENABLE));
                if (!poll_ms)
                        PMD_INIT_LOG(ERR, "Could not disable Rx Queue %d",
                                     rx_queue_id);

                rte_delay_us(RTE_IXGBE_WAIT_100_US);

                ixgbe_rx_queue_release_mbufs(rxq);
                ixgbe_reset_rx_queue(adapter, rxq);
        } else
                return -1;

        return 0;
}


/*
 * Start Transmit Units for specified queue.
 */
int
ixgbe_dev_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        uint32_t txdctl;
        int poll_ms;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (tx_queue_id < dev->data->nb_tx_queues) {
                txq = dev->data->tx_queues[tx_queue_id];
                txdctl = IXGBE_READ_REG(hw, IXGBE_TXDCTL(txq->reg_idx));
                txdctl |= IXGBE_TXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(txq->reg_idx), txdctl);

                /* Wait until TX Enable ready */
                if (hw->mac.type == ixgbe_mac_82599EB) {
                        poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_10_MS;
                        do {
                                rte_delay_ms(1);
                                txdctl = IXGBE_READ_REG(hw,
                                        IXGBE_TXDCTL(txq->reg_idx));
                        } while (--poll_ms && !(txdctl & IXGBE_TXDCTL_ENABLE));
                        if (!poll_ms)
                                PMD_INIT_LOG(ERR, "Could not enable "
                                             "Tx Queue %d", tx_queue_id);
                }
                rte_wmb();
                IXGBE_WRITE_REG(hw, IXGBE_TDH(txq->reg_idx), 0);
                IXGBE_WRITE_REG(hw, IXGBE_TDT(txq->reg_idx), 0);
        } else
                return -1;

        return 0;
}

/*
 * Stop Transmit Units for specified queue.
 */
int
ixgbe_dev_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        uint32_t txdctl;
        uint32_t txtdh, txtdt;
        int poll_ms;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (tx_queue_id < dev->data->nb_tx_queues) {
                txq = dev->data->tx_queues[tx_queue_id];

                /* Wait until TX queue is empty */
                if (hw->mac.type == ixgbe_mac_82599EB) {
                        poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_10_MS;
                        do {
                                rte_delay_us(RTE_IXGBE_WAIT_100_US);
                                txtdh = IXGBE_READ_REG(hw,
                                                IXGBE_TDH(txq->reg_idx));
                                txtdt = IXGBE_READ_REG(hw,
                                                IXGBE_TDT(txq->reg_idx));
                        } while (--poll_ms && (txtdh != txtdt));
                        if (!poll_ms)
                                PMD_INIT_LOG(ERR, "Tx Queue %d is not empty "
                                             "when stopping.", tx_queue_id);
                }

                txdctl = IXGBE_READ_REG(hw, IXGBE_TXDCTL(txq->reg_idx));
                txdctl &= ~IXGBE_TXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(txq->reg_idx), txdctl);

                /* Wait until TX Enable ready */
                if (hw->mac.type == ixgbe_mac_82599EB) {
                        poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_10_MS;
                        do {
                                rte_delay_ms(1);
                                txdctl = IXGBE_READ_REG(hw,
                                                IXGBE_TXDCTL(txq->reg_idx));
                        } while (--poll_ms && (txdctl | IXGBE_TXDCTL_ENABLE));
                        if (!poll_ms)
                                PMD_INIT_LOG(ERR, "Could not disable "
                                             "Tx Queue %d", tx_queue_id);
                }

                if (txq->ops != NULL) {
                        txq->ops->release_mbufs(txq);
                        txq->ops->reset(txq);
                }
        } else
                return -1;

        return 0;
}

/*
 * [VF] Initializes Receive Unit.
 */
int
ixgbevf_dev_rx_init(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_rx_queue *rxq;
        uint64_t bus_addr;
        uint32_t srrctl, psrtype = 0;
        uint16_t buf_size;
        uint16_t i;
        int ret;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        if (rte_is_power_of_2(dev->data->nb_rx_queues) == 0) {
                PMD_INIT_LOG(ERR, "The number of Rx queue invalid, "
                        "it should be power of 2");
                return -1;
        }

        if (dev->data->nb_rx_queues > hw->mac.max_rx_queues) {
                PMD_INIT_LOG(ERR, "The number of Rx queue invalid, "
                        "it should be equal to or less than %d",
                        hw->mac.max_rx_queues);
                return -1;
        }

        /*
         * When the VF driver issues a IXGBE_VF_RESET request, the PF driver
         * disables the VF receipt of packets if the PF MTU is > 1500.
         * This is done to deal with 82599 limitations that imposes
         * the PF and all VFs to share the same MTU.
         * Then, the PF driver enables again the VF receipt of packet when
         * the VF driver issues a IXGBE_VF_SET_LPE request.
         * In the meantime, the VF device cannot be used, even if the VF driver
         * and the Guest VM network stack are ready to accept packets with a
         * size up to the PF MTU.
         * As a work-around to this PF behaviour, force the call to
         * ixgbevf_rlpml_set_vf even if jumbo frames are not used. This way,
         * VF packets received can work in all cases.
         */
        ixgbevf_rlpml_set_vf(hw,
                (uint16_t)dev->data->dev_conf.rxmode.max_rx_pkt_len);

        /* Setup RX queues */
        dev->rx_pkt_burst = ixgbe_recv_pkts;
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rxq = dev->data->rx_queues[i];

                /* Allocate buffers for descriptor rings */
                ret = ixgbe_alloc_rx_queue_mbufs(rxq);
                if (ret)
                        return ret;

                /* Setup the Base and Length of the Rx Descriptor Rings */
                bus_addr = rxq->rx_ring_phys_addr;

                IXGBE_WRITE_REG(hw, IXGBE_VFRDBAL(i),
                                (uint32_t)(bus_addr & 0x00000000ffffffffULL));
                IXGBE_WRITE_REG(hw, IXGBE_VFRDBAH(i),
                                (uint32_t)(bus_addr >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_VFRDLEN(i),
                                rxq->nb_rx_desc * sizeof(union ixgbe_adv_rx_desc));
                IXGBE_WRITE_REG(hw, IXGBE_VFRDH(i), 0);
                IXGBE_WRITE_REG(hw, IXGBE_VFRDT(i), 0);


                /* Configure the SRRCTL register */
#ifdef RTE_HEADER_SPLIT_ENABLE
                /*
                 * Configure Header Split
                 */
                if (dev->data->dev_conf.rxmode.header_split) {
                        srrctl = ((dev->data->dev_conf.rxmode.split_hdr_size <<
                                IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
                                IXGBE_SRRCTL_BSIZEHDR_MASK);
                        srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
                } else
#endif
                        srrctl = IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;

                /* Set if packets are dropped when no descriptors available */
                if (rxq->drop_en)
                        srrctl |= IXGBE_SRRCTL_DROP_EN;

                /*
                 * Configure the RX buffer size in the BSIZEPACKET field of
                 * the SRRCTL register of the queue.
                 * The value is in 1 KB resolution. Valid values can be from
                 * 1 KB to 16 KB.
                 */
                buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mb_pool) -
                        RTE_PKTMBUF_HEADROOM);
                srrctl |= ((buf_size >> IXGBE_SRRCTL_BSIZEPKT_SHIFT) &
                           IXGBE_SRRCTL_BSIZEPKT_MASK);

                /*
                 * VF modification to write virtual function SRRCTL register
                 */
                IXGBE_WRITE_REG(hw, IXGBE_VFSRRCTL(i), srrctl);

                buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) <<
                                       IXGBE_SRRCTL_BSIZEPKT_SHIFT);

                if (dev->data->dev_conf.rxmode.enable_scatter ||
                    /* It adds dual VLAN length for supporting dual VLAN */
                    (dev->data->dev_conf.rxmode.max_rx_pkt_len +
                                2 * IXGBE_VLAN_TAG_SIZE) > buf_size) {
                        if (!dev->data->scattered_rx)
                                PMD_INIT_LOG(DEBUG, "forcing scatter mode");
                        dev->data->scattered_rx = 1;
#ifdef RTE_IXGBE_INC_VECTOR
                        if (rte_is_power_of_2(rxq->nb_rx_desc))
                                dev->rx_pkt_burst =
                                        ixgbe_recv_scattered_pkts_vec;
                        else
#endif
                                dev->rx_pkt_burst =
                                        ixgbe_recv_pkts_lro_single_alloc;
                }
        }

#ifdef RTE_HEADER_SPLIT_ENABLE
        if (dev->data->dev_conf.rxmode.header_split)
                /* Must setup the PSRTYPE register */
                psrtype = IXGBE_PSRTYPE_TCPHDR |
                        IXGBE_PSRTYPE_UDPHDR   |
                        IXGBE_PSRTYPE_IPV4HDR  |
                        IXGBE_PSRTYPE_IPV6HDR;
#endif

        /* Set RQPL for VF RSS according to max Rx queue */
        psrtype |= (dev->data->nb_rx_queues >> 1) <<
                IXGBE_PSRTYPE_RQPL_SHIFT;
        IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, psrtype);

        return 0;
}

/*
 * [VF] Initializes Transmit Unit.
 */
void
ixgbevf_dev_tx_init(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        uint64_t bus_addr;
        uint32_t txctrl;
        uint16_t i;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        /* Setup the Base and Length of the Tx Descriptor Rings */
        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                txq = dev->data->tx_queues[i];
                bus_addr = txq->tx_ring_phys_addr;
                IXGBE_WRITE_REG(hw, IXGBE_VFTDBAL(i),
                                (uint32_t)(bus_addr & 0x00000000ffffffffULL));
                IXGBE_WRITE_REG(hw, IXGBE_VFTDBAH(i),
                                (uint32_t)(bus_addr >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_VFTDLEN(i),
                                txq->nb_tx_desc * sizeof(union ixgbe_adv_tx_desc));
                /* Setup the HW Tx Head and TX Tail descriptor pointers */
                IXGBE_WRITE_REG(hw, IXGBE_VFTDH(i), 0);
                IXGBE_WRITE_REG(hw, IXGBE_VFTDT(i), 0);

                /*
                 * Disable Tx Head Writeback RO bit, since this hoses
                 * bookkeeping if things aren't delivered in order.
                 */
                txctrl = IXGBE_READ_REG(hw,
                                IXGBE_VFDCA_TXCTRL(i));
                txctrl &= ~IXGBE_DCA_TXCTRL_DESC_WRO_EN;
                IXGBE_WRITE_REG(hw, IXGBE_VFDCA_TXCTRL(i),
                                txctrl);
        }
}

/*
 * [VF] Start Transmit and Receive Units.
 */
void
ixgbevf_dev_rxtx_start(struct rte_eth_dev *dev)
{
        struct ixgbe_hw     *hw;
        struct ixgbe_tx_queue *txq;
        struct ixgbe_rx_queue *rxq;
        uint32_t txdctl;
        uint32_t rxdctl;
        uint16_t i;
        int poll_ms;

        PMD_INIT_FUNC_TRACE();
        hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                txq = dev->data->tx_queues[i];
                /* Setup Transmit Threshold Registers */
                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(i));
                txdctl |= txq->pthresh & 0x7F;
                txdctl |= ((txq->hthresh & 0x7F) << 8);
                txdctl |= ((txq->wthresh & 0x7F) << 16);
                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(i), txdctl);
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {

                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(i));
                txdctl |= IXGBE_TXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(i), txdctl);

                poll_ms = 10;
                /* Wait until TX Enable ready */
                do {
                        rte_delay_ms(1);
                        txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(i));
                } while (--poll_ms && !(txdctl & IXGBE_TXDCTL_ENABLE));
                if (!poll_ms)
                        PMD_INIT_LOG(ERR, "Could not enable Tx Queue %d", i);
        }
        for (i = 0; i < dev->data->nb_rx_queues; i++) {

                rxq = dev->data->rx_queues[i];

                rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(i));
                rxdctl |= IXGBE_RXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(i), rxdctl);

                /* Wait until RX Enable ready */
                poll_ms = 10;
                do {
                        rte_delay_ms(1);
                        rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(i));
                } while (--poll_ms && !(rxdctl & IXGBE_RXDCTL_ENABLE));
                if (!poll_ms)
                        PMD_INIT_LOG(ERR, "Could not enable Rx Queue %d", i);
                rte_wmb();
                IXGBE_WRITE_REG(hw, IXGBE_VFRDT(i), rxq->nb_rx_desc - 1);

        }
}

/* Stubs needed for linkage when CONFIG_RTE_IXGBE_INC_VECTOR is set to 'n' */
int __attribute__((weak))
ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev __rte_unused *dev)
{
        return -1;
}

uint16_t __attribute__((weak))
ixgbe_recv_pkts_vec(
        void __rte_unused *rx_queue,
        struct rte_mbuf __rte_unused **rx_pkts,
        uint16_t __rte_unused nb_pkts)
{
        return 0;
}

uint16_t __attribute__((weak))
ixgbe_recv_scattered_pkts_vec(
        void __rte_unused *rx_queue,
        struct rte_mbuf __rte_unused **rx_pkts,
        uint16_t __rte_unused nb_pkts)
{
        return 0;
}

int __attribute__((weak))
ixgbe_rxq_vec_setup(struct ixgbe_rx_queue __rte_unused *rxq)
{
        return -1;
}