net/mlx5: implement CQ for Rx using DevX API

[dpdk.git] / drivers / net / mlx5 / mlx5_rxq.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2015 6WIND S.A.
 * Copyright 2015 Mellanox Technologies, Ltd
 */

#include <stddef.h>
#include <errno.h>
#include <string.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/queue.h>

#include <rte_mbuf.h>
#include <rte_malloc.h>
#include <rte_ethdev_driver.h>
#include <rte_common.h>
#include <rte_interrupts.h>
#include <rte_debug.h>
#include <rte_io.h>
#include <rte_eal_paging.h>

#include <mlx5_glue.h>
#include <mlx5_devx_cmds.h>
#include <mlx5_malloc.h>

#include "mlx5_defs.h"
#include "mlx5.h"
#include "mlx5_common_os.h"
#include "mlx5_rxtx.h"
#include "mlx5_utils.h"
#include "mlx5_autoconf.h"
#include "mlx5_flow.h"


/* Default RSS hash key also used for ConnectX-3. */
uint8_t rss_hash_default_key[] = {
        0x2c, 0xc6, 0x81, 0xd1,
        0x5b, 0xdb, 0xf4, 0xf7,
        0xfc, 0xa2, 0x83, 0x19,
        0xdb, 0x1a, 0x3e, 0x94,
        0x6b, 0x9e, 0x38, 0xd9,
        0x2c, 0x9c, 0x03, 0xd1,
        0xad, 0x99, 0x44, 0xa7,
        0xd9, 0x56, 0x3d, 0x59,
        0x06, 0x3c, 0x25, 0xf3,
        0xfc, 0x1f, 0xdc, 0x2a,
};

/* Length of the default RSS hash key. */
static_assert(MLX5_RSS_HASH_KEY_LEN ==
              (unsigned int)sizeof(rss_hash_default_key),
              "wrong RSS default key size.");

/**
 * Check whether Multi-Packet RQ can be enabled for the device.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   1 if supported, negative errno value if not.
 */
inline int
mlx5_check_mprq_support(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;

        if (priv->config.mprq.enabled &&
            priv->rxqs_n >= priv->config.mprq.min_rxqs_num)
                return 1;
        return -ENOTSUP;
}

/**
 * Check whether Multi-Packet RQ is enabled for the Rx queue.
 *
 *  @param rxq
 *     Pointer to receive queue structure.
 *
 * @return
 *   0 if disabled, otherwise enabled.
 */
inline int
mlx5_rxq_mprq_enabled(struct mlx5_rxq_data *rxq)
{
        return rxq->strd_num_n > 0;
}

/**
 * Check whether Multi-Packet RQ is enabled for the device.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   0 if disabled, otherwise enabled.
 */
inline int
mlx5_mprq_enabled(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        uint32_t i;
        uint16_t n = 0;
        uint16_t n_ibv = 0;

        if (mlx5_check_mprq_support(dev) < 0)
                return 0;
        /* All the configured queues should be enabled. */
        for (i = 0; i < priv->rxqs_n; ++i) {
                struct mlx5_rxq_data *rxq = (*priv->rxqs)[i];
                struct mlx5_rxq_ctrl *rxq_ctrl = container_of
                        (rxq, struct mlx5_rxq_ctrl, rxq);

                if (rxq == NULL || rxq_ctrl->type != MLX5_RXQ_TYPE_STANDARD)
                        continue;
                n_ibv++;
                if (mlx5_rxq_mprq_enabled(rxq))
                        ++n;
        }
        /* Multi-Packet RQ can't be partially configured. */
        MLX5_ASSERT(n == 0 || n == n_ibv);
        return n == n_ibv;
}

/**
 * Allocate RX queue elements for Multi-Packet RQ.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
rxq_alloc_elts_mprq(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        struct mlx5_rxq_data *rxq = &rxq_ctrl->rxq;
        unsigned int wqe_n = 1 << rxq->elts_n;
        unsigned int i;
        int err;

        /* Iterate on segments. */
        for (i = 0; i <= wqe_n; ++i) {
                struct mlx5_mprq_buf *buf;

                if (rte_mempool_get(rxq->mprq_mp, (void **)&buf) < 0) {
                        DRV_LOG(ERR, "port %u empty mbuf pool", rxq->port_id);
                        rte_errno = ENOMEM;
                        goto error;
                }
                if (i < wqe_n)
                        (*rxq->mprq_bufs)[i] = buf;
                else
                        rxq->mprq_repl = buf;
        }
        DRV_LOG(DEBUG,
                "port %u Rx queue %u allocated and configured %u segments",
                rxq->port_id, rxq->idx, wqe_n);
        return 0;
error:
        err = rte_errno; /* Save rte_errno before cleanup. */
        wqe_n = i;
        for (i = 0; (i != wqe_n); ++i) {
                if ((*rxq->mprq_bufs)[i] != NULL)
                        rte_mempool_put(rxq->mprq_mp,
                                        (*rxq->mprq_bufs)[i]);
                (*rxq->mprq_bufs)[i] = NULL;
        }
        DRV_LOG(DEBUG, "port %u Rx queue %u failed, freed everything",
                rxq->port_id, rxq->idx);
        rte_errno = err; /* Restore rte_errno. */
        return -rte_errno;
}

/**
 * Allocate RX queue elements for Single-Packet RQ.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 *
 * @return
 *   0 on success, errno value on failure.
 */
static int
rxq_alloc_elts_sprq(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        const unsigned int sges_n = 1 << rxq_ctrl->rxq.sges_n;
        unsigned int elts_n = 1 << rxq_ctrl->rxq.elts_n;
        unsigned int i;
        int err;

        /* Iterate on segments. */
        for (i = 0; (i != elts_n); ++i) {
                struct rte_mbuf *buf;

                buf = rte_pktmbuf_alloc(rxq_ctrl->rxq.mp);
                if (buf == NULL) {
                        DRV_LOG(ERR, "port %u empty mbuf pool",
                                PORT_ID(rxq_ctrl->priv));
                        rte_errno = ENOMEM;
                        goto error;
                }
                /* Headroom is reserved by rte_pktmbuf_alloc(). */
                MLX5_ASSERT(DATA_OFF(buf) == RTE_PKTMBUF_HEADROOM);
                /* Buffer is supposed to be empty. */
                MLX5_ASSERT(rte_pktmbuf_data_len(buf) == 0);
                MLX5_ASSERT(rte_pktmbuf_pkt_len(buf) == 0);
                MLX5_ASSERT(!buf->next);
                /* Only the first segment keeps headroom. */
                if (i % sges_n)
                        SET_DATA_OFF(buf, 0);
                PORT(buf) = rxq_ctrl->rxq.port_id;
                DATA_LEN(buf) = rte_pktmbuf_tailroom(buf);
                PKT_LEN(buf) = DATA_LEN(buf);
                NB_SEGS(buf) = 1;
                (*rxq_ctrl->rxq.elts)[i] = buf;
        }
        /* If Rx vector is activated. */
        if (mlx5_rxq_check_vec_support(&rxq_ctrl->rxq) > 0) {
                struct mlx5_rxq_data *rxq = &rxq_ctrl->rxq;
                struct rte_mbuf *mbuf_init = &rxq->fake_mbuf;
                struct rte_pktmbuf_pool_private *priv =
                        (struct rte_pktmbuf_pool_private *)
                                rte_mempool_get_priv(rxq_ctrl->rxq.mp);
                int j;

                /* Initialize default rearm_data for vPMD. */
                mbuf_init->data_off = RTE_PKTMBUF_HEADROOM;
                rte_mbuf_refcnt_set(mbuf_init, 1);
                mbuf_init->nb_segs = 1;
                mbuf_init->port = rxq->port_id;
                if (priv->flags & RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF)
                        mbuf_init->ol_flags = EXT_ATTACHED_MBUF;
                /*
                 * prevent compiler reordering:
                 * rearm_data covers previous fields.
                 */
                rte_compiler_barrier();
                rxq->mbuf_initializer =
                        *(rte_xmm_t *)&mbuf_init->rearm_data;
                /* Padding with a fake mbuf for vectorized Rx. */
                for (j = 0; j < MLX5_VPMD_DESCS_PER_LOOP; ++j)
                        (*rxq->elts)[elts_n + j] = &rxq->fake_mbuf;
        }
        DRV_LOG(DEBUG,
                "port %u Rx queue %u allocated and configured %u segments"
                " (max %u packets)",
                PORT_ID(rxq_ctrl->priv), rxq_ctrl->rxq.idx, elts_n,
                elts_n / (1 << rxq_ctrl->rxq.sges_n));
        return 0;
error:
        err = rte_errno; /* Save rte_errno before cleanup. */
        elts_n = i;
        for (i = 0; (i != elts_n); ++i) {
                if ((*rxq_ctrl->rxq.elts)[i] != NULL)
                        rte_pktmbuf_free_seg((*rxq_ctrl->rxq.elts)[i]);
                (*rxq_ctrl->rxq.elts)[i] = NULL;
        }
        DRV_LOG(DEBUG, "port %u Rx queue %u failed, freed everything",
                PORT_ID(rxq_ctrl->priv), rxq_ctrl->rxq.idx);
        rte_errno = err; /* Restore rte_errno. */
        return -rte_errno;
}

/**
 * Allocate RX queue elements.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 *
 * @return
 *   0 on success, errno value on failure.
 */
int
rxq_alloc_elts(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        return mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq) ?
               rxq_alloc_elts_mprq(rxq_ctrl) : rxq_alloc_elts_sprq(rxq_ctrl);
}

/**
 * Free RX queue elements for Multi-Packet RQ.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 */
static void
rxq_free_elts_mprq(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        struct mlx5_rxq_data *rxq = &rxq_ctrl->rxq;
        uint16_t i;

        DRV_LOG(DEBUG, "port %u Multi-Packet Rx queue %u freeing WRs",
                rxq->port_id, rxq->idx);
        if (rxq->mprq_bufs == NULL)
                return;
        MLX5_ASSERT(mlx5_rxq_check_vec_support(rxq) < 0);
        for (i = 0; (i != (1u << rxq->elts_n)); ++i) {
                if ((*rxq->mprq_bufs)[i] != NULL)
                        mlx5_mprq_buf_free((*rxq->mprq_bufs)[i]);
                (*rxq->mprq_bufs)[i] = NULL;
        }
        if (rxq->mprq_repl != NULL) {
                mlx5_mprq_buf_free(rxq->mprq_repl);
                rxq->mprq_repl = NULL;
        }
}

/**
 * Free RX queue elements for Single-Packet RQ.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 */
static void
rxq_free_elts_sprq(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        struct mlx5_rxq_data *rxq = &rxq_ctrl->rxq;
        const uint16_t q_n = (1 << rxq->elts_n);
        const uint16_t q_mask = q_n - 1;
        uint16_t used = q_n - (rxq->rq_ci - rxq->rq_pi);
        uint16_t i;

        DRV_LOG(DEBUG, "port %u Rx queue %u freeing WRs",
                PORT_ID(rxq_ctrl->priv), rxq->idx);
        if (rxq->elts == NULL)
                return;
        /**
         * Some mbuf in the Ring belongs to the application.  They cannot be
         * freed.
         */
        if (mlx5_rxq_check_vec_support(rxq) > 0) {
                for (i = 0; i < used; ++i)
                        (*rxq->elts)[(rxq->rq_ci + i) & q_mask] = NULL;
                rxq->rq_pi = rxq->rq_ci;
        }
        for (i = 0; (i != (1u << rxq->elts_n)); ++i) {
                if ((*rxq->elts)[i] != NULL)
                        rte_pktmbuf_free_seg((*rxq->elts)[i]);
                (*rxq->elts)[i] = NULL;
        }
}

/**
 * Free RX queue elements.
 *
 * @param rxq_ctrl
 *   Pointer to RX queue structure.
 */
static void
rxq_free_elts(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        if (mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq))
                rxq_free_elts_mprq(rxq_ctrl);
        else
                rxq_free_elts_sprq(rxq_ctrl);
}

/**
 * Returns the per-queue supported offloads.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   Supported Rx offloads.
 */
uint64_t
mlx5_get_rx_queue_offloads(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_dev_config *config = &priv->config;
        uint64_t offloads = (DEV_RX_OFFLOAD_SCATTER |
                             DEV_RX_OFFLOAD_TIMESTAMP |
                             DEV_RX_OFFLOAD_JUMBO_FRAME |
                             DEV_RX_OFFLOAD_RSS_HASH);

        if (config->hw_fcs_strip)
                offloads |= DEV_RX_OFFLOAD_KEEP_CRC;

        if (config->hw_csum)
                offloads |= (DEV_RX_OFFLOAD_IPV4_CKSUM |
                             DEV_RX_OFFLOAD_UDP_CKSUM |
                             DEV_RX_OFFLOAD_TCP_CKSUM);
        if (config->hw_vlan_strip)
                offloads |= DEV_RX_OFFLOAD_VLAN_STRIP;
        if (MLX5_LRO_SUPPORTED(dev))
                offloads |= DEV_RX_OFFLOAD_TCP_LRO;
        return offloads;
}


/**
 * Returns the per-port supported offloads.
 *
 * @return
 *   Supported Rx offloads.
 */
uint64_t
mlx5_get_rx_port_offloads(void)
{
        uint64_t offloads = DEV_RX_OFFLOAD_VLAN_FILTER;

        return offloads;
}

/**
 * Verify if the queue can be released.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   1 if the queue can be released
 *   0 if the queue can not be released, there are references to it.
 *   Negative errno and rte_errno is set if queue doesn't exist.
 */
static int
mlx5_rxq_releasable(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *rxq_ctrl;

        if (!(*priv->rxqs)[idx]) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        rxq_ctrl = container_of((*priv->rxqs)[idx], struct mlx5_rxq_ctrl, rxq);
        return (rte_atomic32_read(&rxq_ctrl->refcnt) == 1);
}

/**
 * Rx queue presetup checks.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 * @param desc
 *   Number of descriptors to configure in queue.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx5_rx_queue_pre_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t *desc)
{
        struct mlx5_priv *priv = dev->data->dev_private;

        if (!rte_is_power_of_2(*desc)) {
                *desc = 1 << log2above(*desc);
                DRV_LOG(WARNING,
                        "port %u increased number of descriptors in Rx queue %u"
                        " to the next power of two (%d)",
                        dev->data->port_id, idx, *desc);
        }
        DRV_LOG(DEBUG, "port %u configuring Rx queue %u for %u descriptors",
                dev->data->port_id, idx, *desc);
        if (idx >= priv->rxqs_n) {
                DRV_LOG(ERR, "port %u Rx queue index out of range (%u >= %u)",
                        dev->data->port_id, idx, priv->rxqs_n);
                rte_errno = EOVERFLOW;
                return -rte_errno;
        }
        if (!mlx5_rxq_releasable(dev, idx)) {
                DRV_LOG(ERR, "port %u unable to release queue index %u",
                        dev->data->port_id, idx);
                rte_errno = EBUSY;
                return -rte_errno;
        }
        mlx5_rxq_release(dev, idx);
        return 0;
}

/**
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 * @param desc
 *   Number of descriptors to configure in queue.
 * @param socket
 *   NUMA socket on which memory must be allocated.
 * @param[in] conf
 *   Thresholds parameters.
 * @param mp
 *   Memory pool for buffer allocations.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
                    unsigned int socket, const struct rte_eth_rxconf *conf,
                    struct rte_mempool *mp)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq, struct mlx5_rxq_ctrl, rxq);
        int res;

        res = mlx5_rx_queue_pre_setup(dev, idx, &desc);
        if (res)
                return res;
        rxq_ctrl = mlx5_rxq_new(dev, idx, desc, socket, conf, mp);
        if (!rxq_ctrl) {
                DRV_LOG(ERR, "port %u unable to allocate queue index %u",
                        dev->data->port_id, idx);
                rte_errno = ENOMEM;
                return -rte_errno;
        }
        DRV_LOG(DEBUG, "port %u adding Rx queue %u to list",
                dev->data->port_id, idx);
        (*priv->rxqs)[idx] = &rxq_ctrl->rxq;
        return 0;
}

/**
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 * @param desc
 *   Number of descriptors to configure in queue.
 * @param hairpin_conf
 *   Hairpin configuration parameters.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_hairpin_queue_setup(struct rte_eth_dev *dev, uint16_t idx,
                            uint16_t desc,
                            const struct rte_eth_hairpin_conf *hairpin_conf)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq, struct mlx5_rxq_ctrl, rxq);
        int res;

        res = mlx5_rx_queue_pre_setup(dev, idx, &desc);
        if (res)
                return res;
        if (hairpin_conf->peer_count != 1 ||
            hairpin_conf->peers[0].port != dev->data->port_id ||
            hairpin_conf->peers[0].queue >= priv->txqs_n) {
                DRV_LOG(ERR, "port %u unable to setup hairpin queue index %u "
                        " invalid hairpind configuration", dev->data->port_id,
                        idx);
                rte_errno = EINVAL;
                return -rte_errno;
        }
        rxq_ctrl = mlx5_rxq_hairpin_new(dev, idx, desc, hairpin_conf);
        if (!rxq_ctrl) {
                DRV_LOG(ERR, "port %u unable to allocate queue index %u",
                        dev->data->port_id, idx);
                rte_errno = ENOMEM;
                return -rte_errno;
        }
        DRV_LOG(DEBUG, "port %u adding Rx queue %u to list",
                dev->data->port_id, idx);
        (*priv->rxqs)[idx] = &rxq_ctrl->rxq;
        return 0;
}

/**
 * DPDK callback to release a RX queue.
 *
 * @param dpdk_rxq
 *   Generic RX queue pointer.
 */
void
mlx5_rx_queue_release(void *dpdk_rxq)
{
        struct mlx5_rxq_data *rxq = (struct mlx5_rxq_data *)dpdk_rxq;
        struct mlx5_rxq_ctrl *rxq_ctrl;
        struct mlx5_priv *priv;

        if (rxq == NULL)
                return;
        rxq_ctrl = container_of(rxq, struct mlx5_rxq_ctrl, rxq);
        priv = rxq_ctrl->priv;
        if (!mlx5_rxq_releasable(ETH_DEV(priv), rxq_ctrl->rxq.idx))
                rte_panic("port %u Rx queue %u is still used by a flow and"
                          " cannot be removed\n",
                          PORT_ID(priv), rxq->idx);
        mlx5_rxq_release(ETH_DEV(priv), rxq_ctrl->rxq.idx);
}

/**
 * Get an Rx queue Verbs/DevX object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Queue index in DPDK Rx queue array
 *
 * @return
 *   The Verbs/DevX object if it exists.
 */
static struct mlx5_rxq_obj *
mlx5_rxq_obj_get(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl;

        if (idx >= priv->rxqs_n)
                return NULL;
        if (!rxq_data)
                return NULL;
        rxq_ctrl = container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        if (rxq_ctrl->obj)
                rte_atomic32_inc(&rxq_ctrl->obj->refcnt);
        return rxq_ctrl->obj;
}

/**
 * Release the resources allocated for an RQ DevX object.
 *
 * @param rxq_ctrl
 *   DevX Rx queue object.
 */
static void
rxq_release_devx_rq_resources(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        if (rxq_ctrl->rxq.wqes) {
                mlx5_free((void *)(uintptr_t)rxq_ctrl->rxq.wqes);
                rxq_ctrl->rxq.wqes = NULL;
        }
        if (rxq_ctrl->wq_umem) {
                mlx5_glue->devx_umem_dereg(rxq_ctrl->wq_umem);
                rxq_ctrl->wq_umem = NULL;
        }
}

/**
 * Release the resources allocated for the Rx CQ DevX object.
 *
 * @param rxq_ctrl
 *   DevX Rx queue object.
 */
static void
rxq_release_devx_cq_resources(struct mlx5_rxq_ctrl *rxq_ctrl)
{
        if (rxq_ctrl->rxq.cqes) {
                rte_free((void *)(uintptr_t)rxq_ctrl->rxq.cqes);
                rxq_ctrl->rxq.cqes = NULL;
        }
        if (rxq_ctrl->cq_umem) {
                mlx5_glue->devx_umem_dereg(rxq_ctrl->cq_umem);
                rxq_ctrl->cq_umem = NULL;
        }
}

/**
 * Release an Rx hairpin related resources.
 *
 * @param rxq_obj
 *   Hairpin Rx queue object.
 */
static void
rxq_obj_hairpin_release(struct mlx5_rxq_obj *rxq_obj)
{
        struct mlx5_devx_modify_rq_attr rq_attr = { 0 };

        MLX5_ASSERT(rxq_obj);
        rq_attr.state = MLX5_RQC_STATE_RST;
        rq_attr.rq_state = MLX5_RQC_STATE_RDY;
        mlx5_devx_cmd_modify_rq(rxq_obj->rq, &rq_attr);
        claim_zero(mlx5_devx_cmd_destroy(rxq_obj->rq));
}

/**
 * Release an Rx verbs/DevX queue object.
 *
 * @param rxq_obj
 *   Verbs/DevX Rx queue object.
 *
 * @return
 *   1 while a reference on it exists, 0 when freed.
 */
static int
mlx5_rxq_obj_release(struct mlx5_rxq_obj *rxq_obj)
{
        MLX5_ASSERT(rxq_obj);
        if (rte_atomic32_dec_and_test(&rxq_obj->refcnt)) {
                switch (rxq_obj->type) {
                case MLX5_RXQ_OBJ_TYPE_IBV:
                        MLX5_ASSERT(rxq_obj->wq);
                        MLX5_ASSERT(rxq_obj->ibv_cq);
                        rxq_free_elts(rxq_obj->rxq_ctrl);
                        claim_zero(mlx5_glue->destroy_wq(rxq_obj->wq));
                        claim_zero(mlx5_glue->destroy_cq(rxq_obj->ibv_cq));
                        if (rxq_obj->ibv_channel)
                                claim_zero(mlx5_glue->destroy_comp_channel
                                           (rxq_obj->ibv_channel));
                        break;
                case MLX5_RXQ_OBJ_TYPE_DEVX_RQ:
                        MLX5_ASSERT(rxq_obj->rq);
                        MLX5_ASSERT(rxq_obj->devx_cq);
                        rxq_free_elts(rxq_obj->rxq_ctrl);
                        claim_zero(mlx5_devx_cmd_destroy(rxq_obj->rq));
                        claim_zero(mlx5_devx_cmd_destroy(rxq_obj->devx_cq));
                        if (rxq_obj->devx_channel)
                                mlx5_glue->devx_destroy_event_channel
                                                        (rxq_obj->devx_channel);
                        rxq_release_devx_rq_resources(rxq_obj->rxq_ctrl);
                        rxq_release_devx_cq_resources(rxq_obj->rxq_ctrl);
                        break;
                case MLX5_RXQ_OBJ_TYPE_DEVX_HAIRPIN:
                        MLX5_ASSERT(rxq_obj->rq);
                        rxq_obj_hairpin_release(rxq_obj);
                        break;
                }
                LIST_REMOVE(rxq_obj, next);
                mlx5_free(rxq_obj);
                return 0;
        }
        return 1;
}

/**
 * Allocate queue vector and fill epoll fd list for Rx interrupts.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_intr_vec_enable(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        unsigned int i;
        unsigned int rxqs_n = priv->rxqs_n;
        unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
        unsigned int count = 0;
        struct rte_intr_handle *intr_handle = dev->intr_handle;

        if (!dev->data->dev_conf.intr_conf.rxq)
                return 0;
        mlx5_rx_intr_vec_disable(dev);
        intr_handle->intr_vec = mlx5_malloc(0,
                                n * sizeof(intr_handle->intr_vec[0]),
                                0, SOCKET_ID_ANY);
        if (intr_handle->intr_vec == NULL) {
                DRV_LOG(ERR,
                        "port %u failed to allocate memory for interrupt"
                        " vector, Rx interrupts will not be supported",
                        dev->data->port_id);
                rte_errno = ENOMEM;
                return -rte_errno;
        }
        intr_handle->type = RTE_INTR_HANDLE_EXT;
        for (i = 0; i != n; ++i) {
                /* This rxq obj must not be released in this function. */
                struct mlx5_rxq_obj *rxq_obj = mlx5_rxq_obj_get(dev, i);
                int rc;

                /* Skip queues that cannot request interrupts. */
                if (!rxq_obj || (!rxq_obj->ibv_channel &&
                                 !rxq_obj->devx_channel)) {
                        /* Use invalid intr_vec[] index to disable entry. */
                        intr_handle->intr_vec[i] =
                                RTE_INTR_VEC_RXTX_OFFSET +
                                RTE_MAX_RXTX_INTR_VEC_ID;
                        continue;
                }
                if (count >= RTE_MAX_RXTX_INTR_VEC_ID) {
                        DRV_LOG(ERR,
                                "port %u too many Rx queues for interrupt"
                                " vector size (%d), Rx interrupts cannot be"
                                " enabled",
                                dev->data->port_id, RTE_MAX_RXTX_INTR_VEC_ID);
                        mlx5_rx_intr_vec_disable(dev);
                        rte_errno = ENOMEM;
                        return -rte_errno;
                }
                rc = mlx5_os_set_nonblock_channel_fd(rxq_obj->fd);
                if (rc < 0) {
                        rte_errno = errno;
                        DRV_LOG(ERR,
                                "port %u failed to make Rx interrupt file"
                                " descriptor %d non-blocking for queue index"
                                " %d",
                                dev->data->port_id, rxq_obj->fd, i);
                        mlx5_rx_intr_vec_disable(dev);
                        return -rte_errno;
                }
                intr_handle->intr_vec[i] = RTE_INTR_VEC_RXTX_OFFSET + count;
                intr_handle->efds[count] = rxq_obj->fd;
                count++;
        }
        if (!count)
                mlx5_rx_intr_vec_disable(dev);
        else
                intr_handle->nb_efd = count;
        return 0;
}

/**
 * Clean up Rx interrupts handler.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
void
mlx5_rx_intr_vec_disable(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct rte_intr_handle *intr_handle = dev->intr_handle;
        unsigned int i;
        unsigned int rxqs_n = priv->rxqs_n;
        unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);

        if (!dev->data->dev_conf.intr_conf.rxq)
                return;
        if (!intr_handle->intr_vec)
                goto free;
        for (i = 0; i != n; ++i) {
                struct mlx5_rxq_ctrl *rxq_ctrl;
                struct mlx5_rxq_data *rxq_data;

                if (intr_handle->intr_vec[i] == RTE_INTR_VEC_RXTX_OFFSET +
                    RTE_MAX_RXTX_INTR_VEC_ID)
                        continue;
                /**
                 * Need to access directly the queue to release the reference
                 * kept in mlx5_rx_intr_vec_enable().
                 */
                rxq_data = (*priv->rxqs)[i];
                rxq_ctrl = container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
                if (rxq_ctrl->obj)
                        mlx5_rxq_obj_release(rxq_ctrl->obj);
        }
free:
        rte_intr_free_epoll_fd(intr_handle);
        if (intr_handle->intr_vec)
                mlx5_free(intr_handle->intr_vec);
        intr_handle->nb_efd = 0;
        intr_handle->intr_vec = NULL;
}

/**
 *  MLX5 CQ notification .
 *
 *  @param rxq
 *     Pointer to receive queue structure.
 *  @param sq_n_rxq
 *     Sequence number per receive queue .
 */
static inline void
mlx5_arm_cq(struct mlx5_rxq_data *rxq, int sq_n_rxq)
{
        int sq_n = 0;
        uint32_t doorbell_hi;
        uint64_t doorbell;
        void *cq_db_reg = (char *)rxq->cq_uar + MLX5_CQ_DOORBELL;

        sq_n = sq_n_rxq & MLX5_CQ_SQN_MASK;
        doorbell_hi = sq_n << MLX5_CQ_SQN_OFFSET | (rxq->cq_ci & MLX5_CI_MASK);
        doorbell = (uint64_t)doorbell_hi << 32;
        doorbell |= rxq->cqn;
        rxq->cq_db[MLX5_CQ_ARM_DB] = rte_cpu_to_be_32(doorbell_hi);
        mlx5_uar_write64(rte_cpu_to_be_64(doorbell),
                         cq_db_reg, rxq->uar_lock_cq);
}

/**
 * DPDK callback for Rx queue interrupt enable.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param rx_queue_id
 *   Rx queue number.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_intr_enable(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data;
        struct mlx5_rxq_ctrl *rxq_ctrl;

        rxq_data = (*priv->rxqs)[rx_queue_id];
        if (!rxq_data) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        rxq_ctrl = container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        if (rxq_ctrl->irq) {
                struct mlx5_rxq_obj *rxq_obj;

                rxq_obj = mlx5_rxq_obj_get(dev, rx_queue_id);
                if (!rxq_obj) {
                        rte_errno = EINVAL;
                        return -rte_errno;
                }
                mlx5_arm_cq(rxq_data, rxq_data->cq_arm_sn);
                mlx5_rxq_obj_release(rxq_obj);
        }
        return 0;
}

/**
 * DPDK callback for Rx queue interrupt disable.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param rx_queue_id
 *   Rx queue number.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_intr_disable(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data;
        struct mlx5_rxq_ctrl *rxq_ctrl;
        struct mlx5_rxq_obj *rxq_obj = NULL;
        struct ibv_cq *ev_cq;
        void *ev_ctx;
        int ret;

        rxq_data = (*priv->rxqs)[rx_queue_id];
        if (!rxq_data) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        rxq_ctrl = container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        if (!rxq_ctrl->irq)
                return 0;
        rxq_obj = mlx5_rxq_obj_get(dev, rx_queue_id);
        if (!rxq_obj) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        if (rxq_obj->type == MLX5_RXQ_OBJ_TYPE_IBV) {
                ret = mlx5_glue->get_cq_event(rxq_obj->ibv_channel, &ev_cq,
                                              &ev_ctx);
                if (ret || ev_cq != rxq_obj->ibv_cq) {
                        rte_errno = EINVAL;
                        goto exit;
                }
                mlx5_glue->ack_cq_events(rxq_obj->ibv_cq, 1);
        } else if (rxq_obj->type == MLX5_RXQ_OBJ_TYPE_DEVX_RQ) {
#ifdef HAVE_IBV_DEVX_EVENT
                struct mlx5dv_devx_async_event_hdr *event_data = NULL;

                ret = mlx5_glue->devx_get_event
                                (rxq_obj->devx_channel, event_data,
                                 sizeof(struct mlx5dv_devx_async_event_hdr));
                if (ret <= 0 || event_data->cookie !=
                                (uint64_t)(uintptr_t)rxq_obj->devx_cq) {
                        rte_errno = EINVAL;
                        goto exit;
                }
#endif /* HAVE_IBV_DEVX_EVENT */
        }
        rxq_data->cq_arm_sn++;
        mlx5_rxq_obj_release(rxq_obj);
        return 0;
exit:
        ret = rte_errno; /* Save rte_errno before cleanup. */
        if (rxq_obj)
                mlx5_rxq_obj_release(rxq_obj);
        DRV_LOG(WARNING, "port %u unable to disable interrupt on Rx queue %d",
                dev->data->port_id, rx_queue_id);
        rte_errno = ret; /* Restore rte_errno. */
        return -rte_errno;
}

/**
 * Create a CQ Verbs object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param priv
 *   Pointer to device private data.
 * @param rxq_data
 *   Pointer to Rx queue data.
 * @param cqe_n
 *   Number of CQEs in CQ.
 * @param rxq_obj
 *   Pointer to Rx queue object data.
 *
 * @return
 *   The Verbs object initialised, NULL otherwise and rte_errno is set.
 */
static struct ibv_cq *
mlx5_ibv_cq_new(struct rte_eth_dev *dev, struct mlx5_priv *priv,
                struct mlx5_rxq_data *rxq_data,
                unsigned int cqe_n, struct mlx5_rxq_obj *rxq_obj)
{
        struct {
                struct ibv_cq_init_attr_ex ibv;
                struct mlx5dv_cq_init_attr mlx5;
        } cq_attr;

        cq_attr.ibv = (struct ibv_cq_init_attr_ex){
                .cqe = cqe_n,
                .channel = rxq_obj->ibv_channel,
                .comp_mask = 0,
        };
        cq_attr.mlx5 = (struct mlx5dv_cq_init_attr){
                .comp_mask = 0,
        };
        if (priv->config.cqe_comp && !rxq_data->hw_timestamp &&
            !rxq_data->lro) {
                cq_attr.mlx5.comp_mask |=
                                MLX5DV_CQ_INIT_ATTR_MASK_COMPRESSED_CQE;
#ifdef HAVE_IBV_DEVICE_STRIDING_RQ_SUPPORT
                cq_attr.mlx5.cqe_comp_res_format =
                                mlx5_rxq_mprq_enabled(rxq_data) ?
                                MLX5DV_CQE_RES_FORMAT_CSUM_STRIDX :
                                MLX5DV_CQE_RES_FORMAT_HASH;
#else
                cq_attr.mlx5.cqe_comp_res_format = MLX5DV_CQE_RES_FORMAT_HASH;
#endif
                /*
                 * For vectorized Rx, it must not be doubled in order to
                 * make cq_ci and rq_ci aligned.
                 */
                if (mlx5_rxq_check_vec_support(rxq_data) < 0)
                        cq_attr.ibv.cqe *= 2;
        } else if (priv->config.cqe_comp && rxq_data->hw_timestamp) {
                DRV_LOG(DEBUG,
                        "port %u Rx CQE compression is disabled for HW"
                        " timestamp",
                        dev->data->port_id);
        } else if (priv->config.cqe_comp && rxq_data->lro) {
                DRV_LOG(DEBUG,
                        "port %u Rx CQE compression is disabled for LRO",
                        dev->data->port_id);
        }
#ifdef HAVE_IBV_MLX5_MOD_CQE_128B_PAD
        if (priv->config.cqe_pad) {
                cq_attr.mlx5.comp_mask |= MLX5DV_CQ_INIT_ATTR_MASK_FLAGS;
                cq_attr.mlx5.flags |= MLX5DV_CQ_INIT_ATTR_FLAGS_CQE_PAD;
        }
#endif
        return mlx5_glue->cq_ex_to_cq(mlx5_glue->dv_create_cq(priv->sh->ctx,
                                                              &cq_attr.ibv,
                                                              &cq_attr.mlx5));
}

/**
 * Create a WQ Verbs object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param priv
 *   Pointer to device private data.
 * @param rxq_data
 *   Pointer to Rx queue data.
 * @param idx
 *   Queue index in DPDK Rx queue array
 * @param wqe_n
 *   Number of WQEs in WQ.
 * @param rxq_obj
 *   Pointer to Rx queue object data.
 *
 * @return
 *   The Verbs object initialised, NULL otherwise and rte_errno is set.
 */
static struct ibv_wq *
mlx5_ibv_wq_new(struct rte_eth_dev *dev, struct mlx5_priv *priv,
                struct mlx5_rxq_data *rxq_data, uint16_t idx,
                unsigned int wqe_n, struct mlx5_rxq_obj *rxq_obj)
{
        struct {
                struct ibv_wq_init_attr ibv;
#ifdef HAVE_IBV_DEVICE_STRIDING_RQ_SUPPORT
                struct mlx5dv_wq_init_attr mlx5;
#endif
        } wq_attr;

        wq_attr.ibv = (struct ibv_wq_init_attr){
                .wq_context = NULL, /* Could be useful in the future. */
                .wq_type = IBV_WQT_RQ,
                /* Max number of outstanding WRs. */
                .max_wr = wqe_n >> rxq_data->sges_n,
                /* Max number of scatter/gather elements in a WR. */
                .max_sge = 1 << rxq_data->sges_n,
                .pd = priv->sh->pd,
                .cq = rxq_obj->ibv_cq,
                .comp_mask = IBV_WQ_FLAGS_CVLAN_STRIPPING | 0,
                .create_flags = (rxq_data->vlan_strip ?
                                 IBV_WQ_FLAGS_CVLAN_STRIPPING : 0),
        };
        /* By default, FCS (CRC) is stripped by hardware. */
        if (rxq_data->crc_present) {
                wq_attr.ibv.create_flags |= IBV_WQ_FLAGS_SCATTER_FCS;
                wq_attr.ibv.comp_mask |= IBV_WQ_INIT_ATTR_FLAGS;
        }
        if (priv->config.hw_padding) {
#if defined(HAVE_IBV_WQ_FLAG_RX_END_PADDING)
                wq_attr.ibv.create_flags |= IBV_WQ_FLAG_RX_END_PADDING;
                wq_attr.ibv.comp_mask |= IBV_WQ_INIT_ATTR_FLAGS;
#elif defined(HAVE_IBV_WQ_FLAGS_PCI_WRITE_END_PADDING)
                wq_attr.ibv.create_flags |= IBV_WQ_FLAGS_PCI_WRITE_END_PADDING;
                wq_attr.ibv.comp_mask |= IBV_WQ_INIT_ATTR_FLAGS;
#endif
        }
#ifdef HAVE_IBV_DEVICE_STRIDING_RQ_SUPPORT
        wq_attr.mlx5 = (struct mlx5dv_wq_init_attr){
                .comp_mask = 0,
        };
        if (mlx5_rxq_mprq_enabled(rxq_data)) {
                struct mlx5dv_striding_rq_init_attr *mprq_attr =
                                                &wq_attr.mlx5.striding_rq_attrs;

                wq_attr.mlx5.comp_mask |= MLX5DV_WQ_INIT_ATTR_MASK_STRIDING_RQ;
                *mprq_attr = (struct mlx5dv_striding_rq_init_attr){
                        .single_stride_log_num_of_bytes = rxq_data->strd_sz_n,
                        .single_wqe_log_num_of_strides = rxq_data->strd_num_n,
                        .two_byte_shift_en = MLX5_MPRQ_TWO_BYTE_SHIFT,
                };
        }
        rxq_obj->wq = mlx5_glue->dv_create_wq(priv->sh->ctx, &wq_attr.ibv,
                                              &wq_attr.mlx5);
#else
        rxq_obj->wq = mlx5_glue->create_wq(priv->sh->ctx, &wq_attr.ibv);
#endif
        if (rxq_obj->wq) {
                /*
                 * Make sure number of WRs*SGEs match expectations since a queue
                 * cannot allocate more than "desc" buffers.
                 */
                if (wq_attr.ibv.max_wr != (wqe_n >> rxq_data->sges_n) ||
                    wq_attr.ibv.max_sge != (1u << rxq_data->sges_n)) {
                        DRV_LOG(ERR,
                                "port %u Rx queue %u requested %u*%u but got"
                                " %u*%u WRs*SGEs",
                                dev->data->port_id, idx,
                                wqe_n >> rxq_data->sges_n,
                                (1 << rxq_data->sges_n),
                                wq_attr.ibv.max_wr, wq_attr.ibv.max_sge);
                        claim_zero(mlx5_glue->destroy_wq(rxq_obj->wq));
                        rxq_obj->wq = NULL;
                        rte_errno = EINVAL;
                }
        }
        return rxq_obj->wq;
}

/**
 * Fill common fields of create RQ attributes structure.
 *
 * @param rxq_data
 *   Pointer to Rx queue data.
 * @param cqn
 *   CQ number to use with this RQ.
 * @param rq_attr
 *   RQ attributes structure to fill..
 */
static void
mlx5_devx_create_rq_attr_fill(struct mlx5_rxq_data *rxq_data, uint32_t cqn,
                              struct mlx5_devx_create_rq_attr *rq_attr)
{
        rq_attr->state = MLX5_RQC_STATE_RST;
        rq_attr->vsd = (rxq_data->vlan_strip) ? 0 : 1;
        rq_attr->cqn = cqn;
        rq_attr->scatter_fcs = (rxq_data->crc_present) ? 1 : 0;
}

/**
 * Fill common fields of DevX WQ attributes structure.
 *
 * @param priv
 *   Pointer to device private data.
 * @param rxq_ctrl
 *   Pointer to Rx queue control structure.
 * @param wq_attr
 *   WQ attributes structure to fill..
 */
static void
mlx5_devx_wq_attr_fill(struct mlx5_priv *priv, struct mlx5_rxq_ctrl *rxq_ctrl,
                       struct mlx5_devx_wq_attr *wq_attr)
{
        wq_attr->end_padding_mode = priv->config.cqe_pad ?
                                        MLX5_WQ_END_PAD_MODE_ALIGN :
                                        MLX5_WQ_END_PAD_MODE_NONE;
        wq_attr->pd = priv->sh->pdn;
        wq_attr->dbr_addr = rxq_ctrl->rq_dbr_offset;
        wq_attr->dbr_umem_id = rxq_ctrl->rq_dbr_umem_id;
        wq_attr->dbr_umem_valid = 1;
        wq_attr->wq_umem_id = rxq_ctrl->wq_umem->umem_id;
        wq_attr->wq_umem_valid = 1;
}

/**
 * Create a RQ object using DevX.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Queue index in DPDK Rx queue array
 * @param cqn
 *   CQ number to use with this RQ.
 *
 * @return
 *   The DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_devx_obj *
mlx5_devx_rq_new(struct rte_eth_dev *dev, uint16_t idx, uint32_t cqn)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        struct mlx5_devx_create_rq_attr rq_attr = { 0 };
        uint32_t wqe_n = 1 << (rxq_data->elts_n - rxq_data->sges_n);
        uint32_t wq_size = 0;
        uint32_t wqe_size = 0;
        uint32_t log_wqe_size = 0;
        void *buf = NULL;
        struct mlx5_devx_obj *rq;

        /* Fill RQ attributes. */
        rq_attr.mem_rq_type = MLX5_RQC_MEM_RQ_TYPE_MEMORY_RQ_INLINE;
        rq_attr.flush_in_error_en = 1;
        mlx5_devx_create_rq_attr_fill(rxq_data, cqn, &rq_attr);
        /* Fill WQ attributes for this RQ. */
        if (mlx5_rxq_mprq_enabled(rxq_data)) {
                rq_attr.wq_attr.wq_type = MLX5_WQ_TYPE_CYCLIC_STRIDING_RQ;
                /*
                 * Number of strides in each WQE:
                 * 512*2^single_wqe_log_num_of_strides.
                 */
                rq_attr.wq_attr.single_wqe_log_num_of_strides =
                                rxq_data->strd_num_n -
                                MLX5_MIN_SINGLE_WQE_LOG_NUM_STRIDES;
                /* Stride size = (2^single_stride_log_num_of_bytes)*64B. */
                rq_attr.wq_attr.single_stride_log_num_of_bytes =
                                rxq_data->strd_sz_n -
                                MLX5_MIN_SINGLE_STRIDE_LOG_NUM_BYTES;
                wqe_size = sizeof(struct mlx5_wqe_mprq);
        } else {
                rq_attr.wq_attr.wq_type = MLX5_WQ_TYPE_CYCLIC;
                wqe_size = sizeof(struct mlx5_wqe_data_seg);
        }
        log_wqe_size = log2above(wqe_size) + rxq_data->sges_n;
        rq_attr.wq_attr.log_wq_stride = log_wqe_size;
        rq_attr.wq_attr.log_wq_sz = rxq_data->elts_n - rxq_data->sges_n;
        /* Calculate and allocate WQ memory space. */
        wqe_size = 1 << log_wqe_size; /* round up power of two.*/
        wq_size = wqe_n * wqe_size;
        size_t alignment = MLX5_WQE_BUF_ALIGNMENT;
        if (alignment == (size_t)-1) {
                DRV_LOG(ERR, "Failed to get mem page size");
                rte_errno = ENOMEM;
                return NULL;
        }
        buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, wq_size,
                          alignment, rxq_ctrl->socket);
        if (!buf)
                return NULL;
        rxq_data->wqes = buf;
        rxq_ctrl->wq_umem = mlx5_glue->devx_umem_reg(priv->sh->ctx,
                                                     buf, wq_size, 0);
        if (!rxq_ctrl->wq_umem) {
                mlx5_free(buf);
                return NULL;
        }
        mlx5_devx_wq_attr_fill(priv, rxq_ctrl, &rq_attr.wq_attr);
        rq = mlx5_devx_cmd_create_rq(priv->sh->ctx, &rq_attr, rxq_ctrl->socket);
        if (!rq)
                rxq_release_devx_rq_resources(rxq_ctrl);
        return rq;
}

/**
 * Create a DevX CQ object for an Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param cqe_n
 *   Number of CQEs in CQ.
 * @param idx
 *   Queue index in DPDK Rx queue array
 * @param rxq_obj
 *   Pointer to Rx queue object data.
 *
 * @return
 *   The DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_devx_obj *
mlx5_devx_cq_new(struct rte_eth_dev *dev, unsigned int cqe_n, uint16_t idx,
                 struct mlx5_rxq_obj *rxq_obj)
{
        struct mlx5_devx_obj *cq_obj = 0;
        struct mlx5_devx_cq_attr cq_attr = { 0 };
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        size_t page_size = rte_mem_page_size();
        uint32_t lcore = (uint32_t)rte_lcore_to_cpu_id(-1);
        uint32_t eqn = 0;
        void *buf = NULL;
        uint16_t event_nums[1] = {0};
        uint32_t log_cqe_n;
        uint32_t cq_size;
        int ret = 0;

        if (page_size == (size_t)-1) {
                DRV_LOG(ERR, "Failed to get page_size.");
                goto error;
        }
        if (priv->config.cqe_comp && !rxq_data->hw_timestamp &&
            !rxq_data->lro) {
                cq_attr.cqe_comp_en = MLX5DV_CQ_INIT_ATTR_MASK_COMPRESSED_CQE;
#ifdef HAVE_IBV_DEVICE_STRIDING_RQ_SUPPORT
                cq_attr.mini_cqe_res_format =
                                mlx5_rxq_mprq_enabled(rxq_data) ?
                                MLX5DV_CQE_RES_FORMAT_CSUM_STRIDX :
                                MLX5DV_CQE_RES_FORMAT_HASH;
#else
                cq_attr.mini_cqe_res_format = MLX5DV_CQE_RES_FORMAT_HASH;
#endif
                /*
                 * For vectorized Rx, it must not be doubled in order to
                 * make cq_ci and rq_ci aligned.
                 */
                if (mlx5_rxq_check_vec_support(rxq_data) < 0)
                        cqe_n *= 2;
        } else if (priv->config.cqe_comp && rxq_data->hw_timestamp) {
                DRV_LOG(DEBUG,
                        "port %u Rx CQE compression is disabled for HW"
                        " timestamp",
                        dev->data->port_id);
        } else if (priv->config.cqe_comp && rxq_data->lro) {
                DRV_LOG(DEBUG,
                        "port %u Rx CQE compression is disabled for LRO",
                        dev->data->port_id);
        }
#ifdef HAVE_IBV_MLX5_MOD_CQE_128B_PAD
        if (priv->config.cqe_pad)
                cq_attr.cqe_size = MLX5DV_CQ_INIT_ATTR_FLAGS_CQE_PAD;
#endif
        log_cqe_n = log2above(cqe_n);
        cq_size = sizeof(struct mlx5_cqe) * (1 << log_cqe_n);
        /* Query the EQN for this core. */
        if (mlx5_glue->devx_query_eqn(priv->sh->ctx, lcore, &eqn)) {
                DRV_LOG(ERR, "Failed to query EQN for CQ.");
                goto error;
        }
        cq_attr.eqn = eqn;
        buf = rte_calloc_socket(__func__, 1, cq_size, page_size,
                                rxq_ctrl->socket);
        if (!buf) {
                DRV_LOG(ERR, "Failed to allocate memory for CQ.");
                goto error;
        }
        rxq_data->cqes = (volatile struct mlx5_cqe (*)[])(uintptr_t)buf;
        rxq_ctrl->cq_umem = mlx5_glue->devx_umem_reg(priv->sh->ctx, buf,
                                                     cq_size,
                                                     IBV_ACCESS_LOCAL_WRITE);
        if (!rxq_ctrl->cq_umem) {
                DRV_LOG(ERR, "Failed to register umem for CQ.");
                goto error;
        }
        cq_attr.uar_page_id = priv->sh->devx_rx_uar->page_id;
        cq_attr.q_umem_id = rxq_ctrl->cq_umem->umem_id;
        cq_attr.q_umem_valid = 1;
        cq_attr.log_cq_size = log_cqe_n;
        cq_attr.log_page_size = rte_log2_u32(page_size);
        cq_attr.db_umem_offset = rxq_ctrl->cq_dbr_offset;
        cq_attr.db_umem_id = rxq_ctrl->cq_dbr_umem_id;
        cq_attr.db_umem_valid = rxq_ctrl->cq_dbr_umem_id_valid;
        cq_obj = mlx5_devx_cmd_create_cq(priv->sh->ctx, &cq_attr);
        if (!cq_obj)
                goto error;
        rxq_data->cqe_n = log_cqe_n;
        rxq_data->cqn = cq_obj->id;
        if (rxq_obj->devx_channel) {
                ret = mlx5_glue->devx_subscribe_devx_event
                                                (rxq_obj->devx_channel,
                                                 cq_obj->obj,
                                                 sizeof(event_nums),
                                                 event_nums,
                                                 (uint64_t)(uintptr_t)cq_obj);
                if (ret) {
                        DRV_LOG(ERR, "Fail to subscribe CQ to event channel.");
                        rte_errno = errno;
                        goto error;
                }
        }
        /* Initialise CQ to 1's to mark HW ownership for all CQEs. */
        memset((void *)(uintptr_t)rxq_data->cqes, 0xFF, cq_size);
        return cq_obj;
error:
        rxq_release_devx_cq_resources(rxq_ctrl);
        return NULL;
}

/**
 * Create the Rx hairpin queue object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Queue index in DPDK Rx queue array
 *
 * @return
 *   The hairpin DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_rxq_obj *
mlx5_rxq_obj_hairpin_new(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        struct mlx5_devx_create_rq_attr attr = { 0 };
        struct mlx5_rxq_obj *tmpl = NULL;
        uint32_t max_wq_data;

        MLX5_ASSERT(rxq_data);
        MLX5_ASSERT(!rxq_ctrl->obj);
        tmpl = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, sizeof(*tmpl), 0,
                           rxq_ctrl->socket);
        if (!tmpl) {
                DRV_LOG(ERR,
                        "port %u Rx queue %u cannot allocate verbs resources",
                        dev->data->port_id, rxq_data->idx);
                rte_errno = ENOMEM;
                return NULL;
        }
        tmpl->type = MLX5_RXQ_OBJ_TYPE_DEVX_HAIRPIN;
        tmpl->rxq_ctrl = rxq_ctrl;
        attr.hairpin = 1;
        max_wq_data = priv->config.hca_attr.log_max_hairpin_wq_data_sz;
        /* Jumbo frames > 9KB should be supported, and more packets. */
        if (priv->config.log_hp_size != (uint32_t)MLX5_ARG_UNSET) {
                if (priv->config.log_hp_size > max_wq_data) {
                        DRV_LOG(ERR, "total data size %u power of 2 is "
                                "too large for hairpin",
                                priv->config.log_hp_size);
                        mlx5_free(tmpl);
                        rte_errno = ERANGE;
                        return NULL;
                }
                attr.wq_attr.log_hairpin_data_sz = priv->config.log_hp_size;
        } else {
                attr.wq_attr.log_hairpin_data_sz =
                                (max_wq_data < MLX5_HAIRPIN_JUMBO_LOG_SIZE) ?
                                 max_wq_data : MLX5_HAIRPIN_JUMBO_LOG_SIZE;
        }
        /* Set the packets number to the maximum value for performance. */
        attr.wq_attr.log_hairpin_num_packets =
                        attr.wq_attr.log_hairpin_data_sz -
                        MLX5_HAIRPIN_QUEUE_STRIDE;
        tmpl->rq = mlx5_devx_cmd_create_rq(priv->sh->ctx, &attr,
                                           rxq_ctrl->socket);
        if (!tmpl->rq) {
                DRV_LOG(ERR,
                        "port %u Rx hairpin queue %u can't create rq object",
                        dev->data->port_id, idx);
                mlx5_free(tmpl);
                rte_errno = errno;
                return NULL;
        }
        DRV_LOG(DEBUG, "port %u rxq %u updated with %p", dev->data->port_id,
                idx, (void *)&tmpl);
        rte_atomic32_inc(&tmpl->refcnt);
        LIST_INSERT_HEAD(&priv->rxqsobj, tmpl, next);
        priv->verbs_alloc_ctx.type = MLX5_VERBS_ALLOC_TYPE_NONE;
        return tmpl;
}

/**
 * Create the Rx queue Verbs/DevX object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Queue index in DPDK Rx queue array
 * @param type
 *   Type of Rx queue object to create.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
struct mlx5_rxq_obj *
mlx5_rxq_obj_new(struct rte_eth_dev *dev, uint16_t idx,
                 enum mlx5_rxq_obj_type type)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
        struct ibv_wq_attr mod;
        unsigned int cqe_n;
        unsigned int wqe_n = 1 << rxq_data->elts_n;
        struct mlx5_rxq_obj *tmpl = NULL;
        struct mlx5dv_cq cq_info;
        struct mlx5dv_rwq rwq;
        int ret = 0;
        struct mlx5dv_obj obj;

        MLX5_ASSERT(rxq_data);
        MLX5_ASSERT(!rxq_ctrl->obj);
        if (type == MLX5_RXQ_OBJ_TYPE_DEVX_HAIRPIN)
                return mlx5_rxq_obj_hairpin_new(dev, idx);
        priv->verbs_alloc_ctx.type = MLX5_VERBS_ALLOC_TYPE_RX_QUEUE;
        priv->verbs_alloc_ctx.obj = rxq_ctrl;
        tmpl = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, sizeof(*tmpl), 0,
                           rxq_ctrl->socket);
        if (!tmpl) {
                DRV_LOG(ERR,
                        "port %u Rx queue %u cannot allocate resources",
                        dev->data->port_id, rxq_data->idx);
                rte_errno = ENOMEM;
                goto error;
        }
        tmpl->type = type;
        tmpl->rxq_ctrl = rxq_ctrl;
        if (rxq_ctrl->irq) {
                if (tmpl->type == MLX5_RXQ_OBJ_TYPE_IBV) {
                        tmpl->ibv_channel =
                                mlx5_glue->create_comp_channel(priv->sh->ctx);
                        if (!tmpl->ibv_channel) {
                                DRV_LOG(ERR, "port %u: comp channel creation "
                                        "failure", dev->data->port_id);
                                rte_errno = ENOMEM;
                                goto error;
                        }
                        tmpl->fd = tmpl->ibv_channel->fd;
                } else if (tmpl->type == MLX5_RXQ_OBJ_TYPE_DEVX_RQ) {
                        int devx_ev_flag =
                          MLX5DV_DEVX_CREATE_EVENT_CHANNEL_FLAGS_OMIT_EV_DATA;

                        tmpl->devx_channel =
                                mlx5_glue->devx_create_event_channel
                                                                (priv->sh->ctx,
                                                                 devx_ev_flag);
                        if (!tmpl->devx_channel) {
                                rte_errno = errno;
                                DRV_LOG(ERR,
                                        "Failed to create event channel %d.",
                                        rte_errno);
                                goto error;
                        }
                        tmpl->fd = tmpl->devx_channel->fd;
                }
        }
        if (mlx5_rxq_mprq_enabled(rxq_data))
                cqe_n = wqe_n * (1 << rxq_data->strd_num_n) - 1;
        else
                cqe_n = wqe_n - 1;
        DRV_LOG(DEBUG, "port %u device_attr.max_qp_wr is %d",
                dev->data->port_id, priv->sh->device_attr.max_qp_wr);
        DRV_LOG(DEBUG, "port %u device_attr.max_sge is %d",
                dev->data->port_id, priv->sh->device_attr.max_sge);
        if (tmpl->type == MLX5_RXQ_OBJ_TYPE_IBV) {
                /* Create CQ using Verbs API. */
                tmpl->ibv_cq = mlx5_ibv_cq_new(dev, priv, rxq_data, cqe_n,
                                               tmpl);
                if (!tmpl->ibv_cq) {
                        DRV_LOG(ERR, "port %u Rx queue %u CQ creation failure",
                                dev->data->port_id, idx);
                        rte_errno = ENOMEM;
                        goto error;
                }
                obj.cq.in = tmpl->ibv_cq;
                obj.cq.out = &cq_info;
                ret = mlx5_glue->dv_init_obj(&obj, MLX5DV_OBJ_CQ);
                if (ret) {
                        rte_errno = ret;
                        goto error;
                }
                if (cq_info.cqe_size != RTE_CACHE_LINE_SIZE) {
                        DRV_LOG(ERR,
                                "port %u wrong MLX5_CQE_SIZE environment "
                                "variable value: it should be set to %u",
                                dev->data->port_id, RTE_CACHE_LINE_SIZE);
                        rte_errno = EINVAL;
                        goto error;
                }
                /* Fill the rings. */
                rxq_data->cqe_n = log2above(cq_info.cqe_cnt);
                rxq_data->cq_db = cq_info.dbrec;
                rxq_data->cqes =
                        (volatile struct mlx5_cqe (*)[])(uintptr_t)cq_info.buf;
                rxq_data->cq_uar = cq_info.cq_uar;
                rxq_data->cqn = cq_info.cqn;
                /* Create WQ (RQ) using Verbs API. */
                tmpl->wq = mlx5_ibv_wq_new(dev, priv, rxq_data, idx, wqe_n,
                                           tmpl);
                if (!tmpl->wq) {
                        DRV_LOG(ERR, "port %u Rx queue %u WQ creation failure",
                                dev->data->port_id, idx);
                        rte_errno = ENOMEM;
                        goto error;
                }
                /* Change queue state to ready. */
                mod = (struct ibv_wq_attr){
                        .attr_mask = IBV_WQ_ATTR_STATE,
                        .wq_state = IBV_WQS_RDY,
                };
                ret = mlx5_glue->modify_wq(tmpl->wq, &mod);
                if (ret) {
                        DRV_LOG(ERR,
                                "port %u Rx queue %u WQ state to IBV_WQS_RDY"
                                " failed", dev->data->port_id, idx);
                        rte_errno = ret;
                        goto error;
                }
                obj.rwq.in = tmpl->wq;
                obj.rwq.out = &rwq;
                ret = mlx5_glue->dv_init_obj(&obj, MLX5DV_OBJ_RWQ);
                if (ret) {
                        rte_errno = ret;
                        goto error;
                }
                rxq_data->wqes = rwq.buf;
                rxq_data->rq_db = rwq.dbrec;
        } else if (tmpl->type == MLX5_RXQ_OBJ_TYPE_DEVX_RQ) {
                struct mlx5_devx_modify_rq_attr rq_attr = { 0 };
                struct mlx5_devx_dbr_page *dbr_page;
                int64_t dbr_offset;

                /* Allocate CQ door-bell. */
                dbr_offset = mlx5_get_dbr(priv->sh->ctx, &priv->dbrpgs,
                                          &dbr_page);
                if (dbr_offset < 0) {
                        DRV_LOG(ERR, "Failed to allocate CQ door-bell.");
                        goto error;
                }
                rxq_ctrl->cq_dbr_offset = dbr_offset;
                rxq_ctrl->cq_dbr_umem_id = mlx5_os_get_umem_id(dbr_page->umem);
                rxq_ctrl->cq_dbr_umem_id_valid = 1;
                rxq_data->cq_db =
                        (uint32_t *)((uintptr_t)dbr_page->dbrs +
                                     (uintptr_t)rxq_ctrl->cq_dbr_offset);
                rxq_data->cq_uar = priv->sh->devx_rx_uar->base_addr;
                /* Create CQ using DevX API. */
                tmpl->devx_cq = mlx5_devx_cq_new(dev, cqe_n, idx, tmpl);
                if (!tmpl->devx_cq) {
                        DRV_LOG(ERR, "Failed to create CQ.");
                        goto error;
                }
                /* Allocate RQ door-bell. */
                dbr_offset = mlx5_get_dbr(priv->sh->ctx, &priv->dbrpgs,
                                          &dbr_page);
                if (dbr_offset < 0) {
                        DRV_LOG(ERR, "Failed to allocate RQ door-bell.");
                        goto error;
                }
                rxq_ctrl->rq_dbr_offset = dbr_offset;
                rxq_ctrl->rq_dbr_umem_id = mlx5_os_get_umem_id(dbr_page->umem);
                rxq_ctrl->rq_dbr_umem_id_valid = 1;
                rxq_data->rq_db =
                        (uint32_t *)((uintptr_t)dbr_page->dbrs +
                                     (uintptr_t)rxq_ctrl->rq_dbr_offset);
                /* Create RQ using DevX API. */
                tmpl->rq = mlx5_devx_rq_new(dev, idx, tmpl->devx_cq->id);
                if (!tmpl->rq) {
                        DRV_LOG(ERR, "port %u Rx queue %u RQ creation failure",
                                dev->data->port_id, idx);
                        rte_errno = ENOMEM;
                        goto error;
                }
                /* Change queue state to ready. */
                rq_attr.rq_state = MLX5_RQC_STATE_RST;
                rq_attr.state = MLX5_RQC_STATE_RDY;
                ret = mlx5_devx_cmd_modify_rq(tmpl->rq, &rq_attr);
                if (ret)
                        goto error;
        }
        rxq_data->cq_arm_sn = 0;
        mlx5_rxq_initialize(rxq_data);
        rxq_data->cq_ci = 0;
        DRV_LOG(DEBUG, "port %u rxq %u updated with %p", dev->data->port_id,
                idx, (void *)&tmpl);
        rte_atomic32_inc(&tmpl->refcnt);
        LIST_INSERT_HEAD(&priv->rxqsobj, tmpl, next);
        priv->verbs_alloc_ctx.type = MLX5_VERBS_ALLOC_TYPE_NONE;
        return tmpl;
error:
        if (tmpl) {
                ret = rte_errno; /* Save rte_errno before cleanup. */
                if (tmpl->type == MLX5_RXQ_OBJ_TYPE_IBV) {
                        if (tmpl->wq)
                                claim_zero(mlx5_glue->destroy_wq(tmpl->wq));
                        if (tmpl->ibv_cq)
                                claim_zero(mlx5_glue->destroy_cq(tmpl->ibv_cq));
                        if (tmpl->ibv_channel)
                                claim_zero(mlx5_glue->destroy_comp_channel
                                                        (tmpl->ibv_channel));
                } else if (tmpl->type == MLX5_RXQ_OBJ_TYPE_DEVX_RQ) {
                        if (tmpl->rq)
                                claim_zero(mlx5_devx_cmd_destroy(tmpl->rq));
                        if (tmpl->devx_cq)
                                claim_zero(mlx5_devx_cmd_destroy
                                                        (tmpl->devx_cq));
                        if (tmpl->devx_channel)
                                mlx5_glue->devx_destroy_event_channel
                                                        (tmpl->devx_channel);
                }
                mlx5_free(tmpl);
                rte_errno = ret; /* Restore rte_errno. */
        }
        if (type == MLX5_RXQ_OBJ_TYPE_DEVX_RQ) {
                rxq_release_devx_rq_resources(rxq_ctrl);
                rxq_release_devx_cq_resources(rxq_ctrl);
        }
        priv->verbs_alloc_ctx.type = MLX5_VERBS_ALLOC_TYPE_NONE;
        return NULL;
}

/**
 * Verify the Rx queue objects list is empty
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The number of objects not released.
 */
int
mlx5_rxq_obj_verify(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        int ret = 0;
        struct mlx5_rxq_obj *rxq_obj;

        LIST_FOREACH(rxq_obj, &priv->rxqsobj, next) {
                DRV_LOG(DEBUG, "port %u Rx queue %u still referenced",
                        dev->data->port_id, rxq_obj->rxq_ctrl->rxq.idx);
                ++ret;
        }
        return ret;
}

/**
 * Callback function to initialize mbufs for Multi-Packet RQ.
 */
static inline void
mlx5_mprq_buf_init(struct rte_mempool *mp, void *opaque_arg,
                    void *_m, unsigned int i __rte_unused)
{
        struct mlx5_mprq_buf *buf = _m;
        struct rte_mbuf_ext_shared_info *shinfo;
        unsigned int strd_n = (unsigned int)(uintptr_t)opaque_arg;
        unsigned int j;

        memset(_m, 0, sizeof(*buf));
        buf->mp = mp;
        rte_atomic16_set(&buf->refcnt, 1);
        for (j = 0; j != strd_n; ++j) {
                shinfo = &buf->shinfos[j];
                shinfo->free_cb = mlx5_mprq_buf_free_cb;
                shinfo->fcb_opaque = buf;
        }
}

/**
 * Free mempool of Multi-Packet RQ.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   0 on success, negative errno value on failure.
 */
int
mlx5_mprq_free_mp(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct rte_mempool *mp = priv->mprq_mp;
        unsigned int i;

        if (mp == NULL)
                return 0;
        DRV_LOG(DEBUG, "port %u freeing mempool (%s) for Multi-Packet RQ",
                dev->data->port_id, mp->name);
        /*
         * If a buffer in the pool has been externally attached to a mbuf and it
         * is still in use by application, destroying the Rx queue can spoil
         * the packet. It is unlikely to happen but if application dynamically
         * creates and destroys with holding Rx packets, this can happen.
         *
         * TODO: It is unavoidable for now because the mempool for Multi-Packet
         * RQ isn't provided by application but managed by PMD.
         */
        if (!rte_mempool_full(mp)) {
                DRV_LOG(ERR,
                        "port %u mempool for Multi-Packet RQ is still in use",
                        dev->data->port_id);
                rte_errno = EBUSY;
                return -rte_errno;
        }
        rte_mempool_free(mp);
        /* Unset mempool for each Rx queue. */
        for (i = 0; i != priv->rxqs_n; ++i) {
                struct mlx5_rxq_data *rxq = (*priv->rxqs)[i];

                if (rxq == NULL)
                        continue;
                rxq->mprq_mp = NULL;
        }
        priv->mprq_mp = NULL;
        return 0;
}

/**
 * Allocate a mempool for Multi-Packet RQ. All configured Rx queues share the
 * mempool. If already allocated, reuse it if there're enough elements.
 * Otherwise, resize it.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   0 on success, negative errno value on failure.
 */
int
mlx5_mprq_alloc_mp(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct rte_mempool *mp = priv->mprq_mp;
        char name[RTE_MEMPOOL_NAMESIZE];
        unsigned int desc = 0;
        unsigned int buf_len;
        unsigned int obj_num;
        unsigned int obj_size;
        unsigned int strd_num_n = 0;
        unsigned int strd_sz_n = 0;
        unsigned int i;
        unsigned int n_ibv = 0;

        if (!mlx5_mprq_enabled(dev))
                return 0;
        /* Count the total number of descriptors configured. */
        for (i = 0; i != priv->rxqs_n; ++i) {
                struct mlx5_rxq_data *rxq = (*priv->rxqs)[i];
                struct mlx5_rxq_ctrl *rxq_ctrl = container_of
                        (rxq, struct mlx5_rxq_ctrl, rxq);

                if (rxq == NULL || rxq_ctrl->type != MLX5_RXQ_TYPE_STANDARD)
                        continue;
                n_ibv++;
                desc += 1 << rxq->elts_n;
                /* Get the max number of strides. */
                if (strd_num_n < rxq->strd_num_n)
                        strd_num_n = rxq->strd_num_n;
                /* Get the max size of a stride. */
                if (strd_sz_n < rxq->strd_sz_n)
                        strd_sz_n = rxq->strd_sz_n;
        }
        MLX5_ASSERT(strd_num_n && strd_sz_n);
        buf_len = (1 << strd_num_n) * (1 << strd_sz_n);
        obj_size = sizeof(struct mlx5_mprq_buf) + buf_len + (1 << strd_num_n) *
                sizeof(struct rte_mbuf_ext_shared_info) + RTE_PKTMBUF_HEADROOM;
        /*
         * Received packets can be either memcpy'd or externally referenced. In
         * case that the packet is attached to an mbuf as an external buffer, as
         * it isn't possible to predict how the buffers will be queued by
         * application, there's no option to exactly pre-allocate needed buffers
         * in advance but to speculatively prepares enough buffers.
         *
         * In the data path, if this Mempool is depleted, PMD will try to memcpy
         * received packets to buffers provided by application (rxq->mp) until
         * this Mempool gets available again.
         */
        desc *= 4;
        obj_num = desc + MLX5_MPRQ_MP_CACHE_SZ * n_ibv;
        /*
         * rte_mempool_create_empty() has sanity check to refuse large cache
         * size compared to the number of elements.
         * CACHE_FLUSHTHRESH_MULTIPLIER is defined in a C file, so using a
         * constant number 2 instead.
         */
        obj_num = RTE_MAX(obj_num, MLX5_MPRQ_MP_CACHE_SZ * 2);
        /* Check a mempool is already allocated and if it can be resued. */
        if (mp != NULL && mp->elt_size >= obj_size && mp->size >= obj_num) {
                DRV_LOG(DEBUG, "port %u mempool %s is being reused",
                        dev->data->port_id, mp->name);
                /* Reuse. */
                goto exit;
        } else if (mp != NULL) {
                DRV_LOG(DEBUG, "port %u mempool %s should be resized, freeing it",
                        dev->data->port_id, mp->name);
                /*
                 * If failed to free, which means it may be still in use, no way
                 * but to keep using the existing one. On buffer underrun,
                 * packets will be memcpy'd instead of external buffer
                 * attachment.
                 */
                if (mlx5_mprq_free_mp(dev)) {
                        if (mp->elt_size >= obj_size)
                                goto exit;
                        else
                                return -rte_errno;
                }
        }
        snprintf(name, sizeof(name), "port-%u-mprq", dev->data->port_id);
        mp = rte_mempool_create(name, obj_num, obj_size, MLX5_MPRQ_MP_CACHE_SZ,
                                0, NULL, NULL, mlx5_mprq_buf_init,
                                (void *)(uintptr_t)(1 << strd_num_n),
                                dev->device->numa_node, 0);
        if (mp == NULL) {
                DRV_LOG(ERR,
                        "port %u failed to allocate a mempool for"
                        " Multi-Packet RQ, count=%u, size=%u",
                        dev->data->port_id, obj_num, obj_size);
                rte_errno = ENOMEM;
                return -rte_errno;
        }
        priv->mprq_mp = mp;
exit:
        /* Set mempool for each Rx queue. */
        for (i = 0; i != priv->rxqs_n; ++i) {
                struct mlx5_rxq_data *rxq = (*priv->rxqs)[i];
                struct mlx5_rxq_ctrl *rxq_ctrl = container_of
                        (rxq, struct mlx5_rxq_ctrl, rxq);

                if (rxq == NULL || rxq_ctrl->type != MLX5_RXQ_TYPE_STANDARD)
                        continue;
                rxq->mprq_mp = mp;
        }
        DRV_LOG(INFO, "port %u Multi-Packet RQ is configured",
                dev->data->port_id);
        return 0;
}

#define MLX5_MAX_TCP_HDR_OFFSET ((unsigned int)(sizeof(struct rte_ether_hdr) + \
                                        sizeof(struct rte_vlan_hdr) * 2 + \
                                        sizeof(struct rte_ipv6_hdr)))
#define MAX_TCP_OPTION_SIZE 40u
#define MLX5_MAX_LRO_HEADER_FIX ((unsigned int)(MLX5_MAX_TCP_HDR_OFFSET + \
                                 sizeof(struct rte_tcp_hdr) + \
                                 MAX_TCP_OPTION_SIZE))

/**
 * Adjust the maximum LRO massage size.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 * @param max_lro_size
 *   The maximum size for LRO packet.
 */
static void
mlx5_max_lro_msg_size_adjust(struct rte_eth_dev *dev, uint16_t idx,
                             uint32_t max_lro_size)
{
        struct mlx5_priv *priv = dev->data->dev_private;

        if (priv->config.hca_attr.lro_max_msg_sz_mode ==
            MLX5_LRO_MAX_MSG_SIZE_START_FROM_L4 && max_lro_size >
            MLX5_MAX_TCP_HDR_OFFSET)
                max_lro_size -= MLX5_MAX_TCP_HDR_OFFSET;
        max_lro_size = RTE_MIN(max_lro_size, MLX5_MAX_LRO_SIZE);
        MLX5_ASSERT(max_lro_size >= MLX5_LRO_SEG_CHUNK_SIZE);
        max_lro_size /= MLX5_LRO_SEG_CHUNK_SIZE;
        if (priv->max_lro_msg_size)
                priv->max_lro_msg_size =
                        RTE_MIN((uint32_t)priv->max_lro_msg_size, max_lro_size);
        else
                priv->max_lro_msg_size = max_lro_size;
        DRV_LOG(DEBUG,
                "port %u Rx Queue %u max LRO message size adjusted to %u bytes",
                dev->data->port_id, idx,
                priv->max_lro_msg_size * MLX5_LRO_SEG_CHUNK_SIZE);
}

/**
 * Create a DPDK Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 * @param desc
 *   Number of descriptors to configure in queue.
 * @param socket
 *   NUMA socket on which memory must be allocated.
 *
 * @return
 *   A DPDK queue object on success, NULL otherwise and rte_errno is set.
 */
struct mlx5_rxq_ctrl *
mlx5_rxq_new(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
             unsigned int socket, const struct rte_eth_rxconf *conf,
             struct rte_mempool *mp)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *tmpl;
        unsigned int mb_len = rte_pktmbuf_data_room_size(mp);
        unsigned int mprq_stride_nums;
        unsigned int mprq_stride_size;
        unsigned int mprq_stride_cap;
        struct mlx5_dev_config *config = &priv->config;
        /*
         * Always allocate extra slots, even if eventually
         * the vector Rx will not be used.
         */
        uint16_t desc_n =
                desc + config->rx_vec_en * MLX5_VPMD_DESCS_PER_LOOP;
        uint64_t offloads = conf->offloads |
                           dev->data->dev_conf.rxmode.offloads;
        unsigned int lro_on_queue = !!(offloads & DEV_RX_OFFLOAD_TCP_LRO);
        const int mprq_en = mlx5_check_mprq_support(dev) > 0;
        unsigned int max_rx_pkt_len = lro_on_queue ?
                        dev->data->dev_conf.rxmode.max_lro_pkt_size :
                        dev->data->dev_conf.rxmode.max_rx_pkt_len;
        unsigned int non_scatter_min_mbuf_size = max_rx_pkt_len +
                                                        RTE_PKTMBUF_HEADROOM;
        unsigned int max_lro_size = 0;
        unsigned int first_mb_free_size = mb_len - RTE_PKTMBUF_HEADROOM;

        if (non_scatter_min_mbuf_size > mb_len && !(offloads &
                                                    DEV_RX_OFFLOAD_SCATTER)) {
                DRV_LOG(ERR, "port %u Rx queue %u: Scatter offload is not"
                        " configured and no enough mbuf space(%u) to contain "
                        "the maximum RX packet length(%u) with head-room(%u)",
                        dev->data->port_id, idx, mb_len, max_rx_pkt_len,
                        RTE_PKTMBUF_HEADROOM);
                rte_errno = ENOSPC;
                return NULL;
        }
        tmpl = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, sizeof(*tmpl) +
                           desc_n * sizeof(struct rte_mbuf *), 0, socket);
        if (!tmpl) {
                rte_errno = ENOMEM;
                return NULL;
        }
        tmpl->type = MLX5_RXQ_TYPE_STANDARD;
        if (mlx5_mr_btree_init(&tmpl->rxq.mr_ctrl.cache_bh,
                               MLX5_MR_BTREE_CACHE_N, socket)) {
                /* rte_errno is already set. */
                goto error;
        }
        tmpl->socket = socket;
        if (dev->data->dev_conf.intr_conf.rxq)
                tmpl->irq = 1;
        mprq_stride_nums = config->mprq.stride_num_n ?
                config->mprq.stride_num_n : MLX5_MPRQ_STRIDE_NUM_N;
        mprq_stride_size = non_scatter_min_mbuf_size <=
                (1U << config->mprq.max_stride_size_n) ?
                log2above(non_scatter_min_mbuf_size) : MLX5_MPRQ_STRIDE_SIZE_N;
        mprq_stride_cap = (config->mprq.stride_num_n ?
                (1U << config->mprq.stride_num_n) : (1U << mprq_stride_nums)) *
                        (config->mprq.stride_size_n ?
                (1U << config->mprq.stride_size_n) : (1U << mprq_stride_size));
        /*
         * This Rx queue can be configured as a Multi-Packet RQ if all of the
         * following conditions are met:
         *  - MPRQ is enabled.
         *  - The number of descs is more than the number of strides.
         *  - max_rx_pkt_len plus overhead is less than the max size
         *    of a stride or mprq_stride_size is specified by a user.
         *    Need to nake sure that there are enough stides to encap
         *    the maximum packet size in case mprq_stride_size is set.
         *  Otherwise, enable Rx scatter if necessary.
         */
        if (mprq_en && desc > (1U << mprq_stride_nums) &&
            (non_scatter_min_mbuf_size <=
             (1U << config->mprq.max_stride_size_n) ||
             (config->mprq.stride_size_n &&
              non_scatter_min_mbuf_size <= mprq_stride_cap))) {
                /* TODO: Rx scatter isn't supported yet. */
                tmpl->rxq.sges_n = 0;
                /* Trim the number of descs needed. */
                desc >>= mprq_stride_nums;
                tmpl->rxq.strd_num_n = config->mprq.stride_num_n ?
                        config->mprq.stride_num_n : mprq_stride_nums;
                tmpl->rxq.strd_sz_n = config->mprq.stride_size_n ?
                        config->mprq.stride_size_n : mprq_stride_size;
                tmpl->rxq.strd_shift_en = MLX5_MPRQ_TWO_BYTE_SHIFT;
                tmpl->rxq.strd_scatter_en =
                                !!(offloads & DEV_RX_OFFLOAD_SCATTER);
                tmpl->rxq.mprq_max_memcpy_len = RTE_MIN(first_mb_free_size,
                                config->mprq.max_memcpy_len);
                max_lro_size = RTE_MIN(max_rx_pkt_len,
                                       (1u << tmpl->rxq.strd_num_n) *
                                       (1u << tmpl->rxq.strd_sz_n));
                DRV_LOG(DEBUG,
                        "port %u Rx queue %u: Multi-Packet RQ is enabled"
                        " strd_num_n = %u, strd_sz_n = %u",
                        dev->data->port_id, idx,
                        tmpl->rxq.strd_num_n, tmpl->rxq.strd_sz_n);
        } else if (max_rx_pkt_len <= first_mb_free_size) {
                tmpl->rxq.sges_n = 0;
                max_lro_size = max_rx_pkt_len;
        } else if (offloads & DEV_RX_OFFLOAD_SCATTER) {
                unsigned int size = non_scatter_min_mbuf_size;
                unsigned int sges_n;

                if (lro_on_queue && first_mb_free_size <
                    MLX5_MAX_LRO_HEADER_FIX) {
                        DRV_LOG(ERR, "Not enough space in the first segment(%u)"
                                " to include the max header size(%u) for LRO",
                                first_mb_free_size, MLX5_MAX_LRO_HEADER_FIX);
                        rte_errno = ENOTSUP;
                        goto error;
                }
                /*
                 * Determine the number of SGEs needed for a full packet
                 * and round it to the next power of two.
                 */
                sges_n = log2above((size / mb_len) + !!(size % mb_len));
                if (sges_n > MLX5_MAX_LOG_RQ_SEGS) {
                        DRV_LOG(ERR,
                                "port %u too many SGEs (%u) needed to handle"
                                " requested maximum packet size %u, the maximum"
                                " supported are %u", dev->data->port_id,
                                1 << sges_n, max_rx_pkt_len,
                                1u << MLX5_MAX_LOG_RQ_SEGS);
                        rte_errno = ENOTSUP;
                        goto error;
                }
                tmpl->rxq.sges_n = sges_n;
                max_lro_size = max_rx_pkt_len;
        }
        if (config->mprq.enabled && !mlx5_rxq_mprq_enabled(&tmpl->rxq))
                DRV_LOG(WARNING,
                        "port %u MPRQ is requested but cannot be enabled\n"
                        " (requested: pkt_sz = %u, desc_num = %u,"
                        " rxq_num = %u, stride_sz = %u, stride_num = %u\n"
                        "  supported: min_rxqs_num = %u,"
                        " min_stride_sz = %u, max_stride_sz = %u).",
                        dev->data->port_id, non_scatter_min_mbuf_size,
                        desc, priv->rxqs_n,
                        config->mprq.stride_size_n ?
                                (1U << config->mprq.stride_size_n) :
                                (1U << mprq_stride_size),
                        config->mprq.stride_num_n ?
                                (1U << config->mprq.stride_num_n) :
                                (1U << mprq_stride_nums),
                        config->mprq.min_rxqs_num,
                        (1U << config->mprq.min_stride_size_n),
                        (1U << config->mprq.max_stride_size_n));
        DRV_LOG(DEBUG, "port %u maximum number of segments per packet: %u",
                dev->data->port_id, 1 << tmpl->rxq.sges_n);
        if (desc % (1 << tmpl->rxq.sges_n)) {
                DRV_LOG(ERR,
                        "port %u number of Rx queue descriptors (%u) is not a"
                        " multiple of SGEs per packet (%u)",
                        dev->data->port_id,
                        desc,
                        1 << tmpl->rxq.sges_n);
                rte_errno = EINVAL;
                goto error;
        }
        mlx5_max_lro_msg_size_adjust(dev, idx, max_lro_size);
        /* Toggle RX checksum offload if hardware supports it. */
        tmpl->rxq.csum = !!(offloads & DEV_RX_OFFLOAD_CHECKSUM);
        tmpl->rxq.hw_timestamp = !!(offloads & DEV_RX_OFFLOAD_TIMESTAMP);
        /* Configure VLAN stripping. */
        tmpl->rxq.vlan_strip = !!(offloads & DEV_RX_OFFLOAD_VLAN_STRIP);
        /* By default, FCS (CRC) is stripped by hardware. */
        tmpl->rxq.crc_present = 0;
        tmpl->rxq.lro = lro_on_queue;
        if (offloads & DEV_RX_OFFLOAD_KEEP_CRC) {
                if (config->hw_fcs_strip) {
                        /*
                         * RQs used for LRO-enabled TIRs should not be
                         * configured to scatter the FCS.
                         */
                        if (lro_on_queue)
                                DRV_LOG(WARNING,
                                        "port %u CRC stripping has been "
                                        "disabled but will still be performed "
                                        "by hardware, because LRO is enabled",
                                        dev->data->port_id);
                        else
                                tmpl->rxq.crc_present = 1;
                } else {
                        DRV_LOG(WARNING,
                                "port %u CRC stripping has been disabled but will"
                                " still be performed by hardware, make sure MLNX_OFED"
                                " and firmware are up to date",
                                dev->data->port_id);
                }
        }
        DRV_LOG(DEBUG,
                "port %u CRC stripping is %s, %u bytes will be subtracted from"
                " incoming frames to hide it",
                dev->data->port_id,
                tmpl->rxq.crc_present ? "disabled" : "enabled",
                tmpl->rxq.crc_present << 2);
        /* Save port ID. */
        tmpl->rxq.rss_hash = !!priv->rss_conf.rss_hf &&
                (!!(dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS));
        tmpl->rxq.port_id = dev->data->port_id;
        tmpl->priv = priv;
        tmpl->rxq.mp = mp;
        tmpl->rxq.elts_n = log2above(desc);
        tmpl->rxq.rq_repl_thresh =
                MLX5_VPMD_RXQ_RPLNSH_THRESH(1 << tmpl->rxq.elts_n);
        tmpl->rxq.elts =
                (struct rte_mbuf *(*)[1 << tmpl->rxq.elts_n])(tmpl + 1);
#ifndef RTE_ARCH_64
        tmpl->rxq.uar_lock_cq = &priv->sh->uar_lock_cq;
#endif
        tmpl->rxq.idx = idx;
        rte_atomic32_inc(&tmpl->refcnt);
        LIST_INSERT_HEAD(&priv->rxqsctrl, tmpl, next);
        return tmpl;
error:
        mlx5_free(tmpl);
        return NULL;
}

/**
 * Create a DPDK Rx hairpin queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 * @param desc
 *   Number of descriptors to configure in queue.
 * @param hairpin_conf
 *   The hairpin binding configuration.
 *
 * @return
 *   A DPDK queue object on success, NULL otherwise and rte_errno is set.
 */
struct mlx5_rxq_ctrl *
mlx5_rxq_hairpin_new(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
                     const struct rte_eth_hairpin_conf *hairpin_conf)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *tmpl;

        tmpl = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, sizeof(*tmpl), 0,
                           SOCKET_ID_ANY);
        if (!tmpl) {
                rte_errno = ENOMEM;
                return NULL;
        }
        tmpl->type = MLX5_RXQ_TYPE_HAIRPIN;
        tmpl->socket = SOCKET_ID_ANY;
        tmpl->rxq.rss_hash = 0;
        tmpl->rxq.port_id = dev->data->port_id;
        tmpl->priv = priv;
        tmpl->rxq.mp = NULL;
        tmpl->rxq.elts_n = log2above(desc);
        tmpl->rxq.elts = NULL;
        tmpl->rxq.mr_ctrl.cache_bh = (struct mlx5_mr_btree) { 0 };
        tmpl->hairpin_conf = *hairpin_conf;
        tmpl->rxq.idx = idx;
        rte_atomic32_inc(&tmpl->refcnt);
        LIST_INSERT_HEAD(&priv->rxqsctrl, tmpl, next);
        return tmpl;
}

/**
 * Get a Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   A pointer to the queue if it exists, NULL otherwise.
 */
struct mlx5_rxq_ctrl *
mlx5_rxq_get(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *rxq_ctrl = NULL;

        if ((*priv->rxqs)[idx]) {
                rxq_ctrl = container_of((*priv->rxqs)[idx],
                                        struct mlx5_rxq_ctrl,
                                        rxq);
                mlx5_rxq_obj_get(dev, idx);
                rte_atomic32_inc(&rxq_ctrl->refcnt);
        }
        return rxq_ctrl;
}

/**
 * Release a Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   1 while a reference on it exists, 0 when freed.
 */
int
mlx5_rxq_release(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *rxq_ctrl;

        if (!(*priv->rxqs)[idx])
                return 0;
        rxq_ctrl = container_of((*priv->rxqs)[idx], struct mlx5_rxq_ctrl, rxq);
        MLX5_ASSERT(rxq_ctrl->priv);
        if (rxq_ctrl->obj && !mlx5_rxq_obj_release(rxq_ctrl->obj))
                rxq_ctrl->obj = NULL;
        if (rte_atomic32_dec_and_test(&rxq_ctrl->refcnt)) {
                if (rxq_ctrl->rq_dbr_umem_id_valid)
                        claim_zero(mlx5_release_dbr(&priv->dbrpgs,
                                                    rxq_ctrl->rq_dbr_umem_id,
                                                    rxq_ctrl->rq_dbr_offset));
                if (rxq_ctrl->cq_dbr_umem_id_valid)
                        claim_zero(mlx5_release_dbr(&priv->dbrpgs,
                                                    rxq_ctrl->cq_dbr_umem_id,
                                                    rxq_ctrl->cq_dbr_offset));
                if (rxq_ctrl->type == MLX5_RXQ_TYPE_STANDARD)
                        mlx5_mr_btree_free(&rxq_ctrl->rxq.mr_ctrl.cache_bh);
                LIST_REMOVE(rxq_ctrl, next);
                mlx5_free(rxq_ctrl);
                (*priv->rxqs)[idx] = NULL;
                return 0;
        }
        return 1;
}

/**
 * Verify the Rx Queue list is empty
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The number of object not released.
 */
int
mlx5_rxq_verify(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *rxq_ctrl;
        int ret = 0;

        LIST_FOREACH(rxq_ctrl, &priv->rxqsctrl, next) {
                DRV_LOG(DEBUG, "port %u Rx Queue %u still referenced",
                        dev->data->port_id, rxq_ctrl->rxq.idx);
                ++ret;
        }
        return ret;
}

/**
 * Get a Rx queue type.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Rx queue index.
 *
 * @return
 *   The Rx queue type.
 */
enum mlx5_rxq_type
mlx5_rxq_get_type(struct rte_eth_dev *dev, uint16_t idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *rxq_ctrl = NULL;

        if (idx < priv->rxqs_n && (*priv->rxqs)[idx]) {
                rxq_ctrl = container_of((*priv->rxqs)[idx],
                                        struct mlx5_rxq_ctrl,
                                        rxq);
                return rxq_ctrl->type;
        }
        return MLX5_RXQ_TYPE_UNDEFINED;
}

/**
 * Create an indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param queues
 *   Queues entering in the indirection table.
 * @param queues_n
 *   Number of queues in the array.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_ind_table_obj *
mlx5_ind_table_obj_new(struct rte_eth_dev *dev, const uint16_t *queues,
                       uint32_t queues_n, enum mlx5_ind_tbl_type type)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl;
        unsigned int i = 0, j = 0, k = 0;

        ind_tbl = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*ind_tbl) +
                              queues_n * sizeof(uint16_t), 0, SOCKET_ID_ANY);
        if (!ind_tbl) {
                rte_errno = ENOMEM;
                return NULL;
        }
        ind_tbl->type = type;
        if (ind_tbl->type == MLX5_IND_TBL_TYPE_IBV) {
                const unsigned int wq_n = rte_is_power_of_2(queues_n) ?
                        log2above(queues_n) :
                        log2above(priv->config.ind_table_max_size);
                struct ibv_wq *wq[1 << wq_n];

                for (i = 0; i != queues_n; ++i) {
                        struct mlx5_rxq_ctrl *rxq = mlx5_rxq_get(dev,
                                                                 queues[i]);
                        if (!rxq)
                                goto error;
                        wq[i] = rxq->obj->wq;
                        ind_tbl->queues[i] = queues[i];
                }
                ind_tbl->queues_n = queues_n;
                /* Finalise indirection table. */
                k = i; /* Retain value of i for use in error case. */
                for (j = 0; k != (unsigned int)(1 << wq_n); ++k, ++j)
                        wq[k] = wq[j];
                ind_tbl->ind_table = mlx5_glue->create_rwq_ind_table
                        (priv->sh->ctx,
                         &(struct ibv_rwq_ind_table_init_attr){
                                .log_ind_tbl_size = wq_n,
                                .ind_tbl = wq,
                                .comp_mask = 0,
                        });
                if (!ind_tbl->ind_table) {
                        rte_errno = errno;
                        goto error;
                }
        } else { /* ind_tbl->type == MLX5_IND_TBL_TYPE_DEVX */
                struct mlx5_devx_rqt_attr *rqt_attr = NULL;
                const unsigned int rqt_n =
                        1 << (rte_is_power_of_2(queues_n) ?
                              log2above(queues_n) :
                              log2above(priv->config.ind_table_max_size));

                rqt_attr = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*rqt_attr) +
                                      rqt_n * sizeof(uint32_t), 0,
                                      SOCKET_ID_ANY);
                if (!rqt_attr) {
                        DRV_LOG(ERR, "port %u cannot allocate RQT resources",
                                dev->data->port_id);
                        rte_errno = ENOMEM;
                        goto error;
                }
                rqt_attr->rqt_max_size = priv->config.ind_table_max_size;
                rqt_attr->rqt_actual_size = rqt_n;
                for (i = 0; i != queues_n; ++i) {
                        struct mlx5_rxq_ctrl *rxq = mlx5_rxq_get(dev,
                                                                 queues[i]);
                        if (!rxq)
                                goto error;
                        rqt_attr->rq_list[i] = rxq->obj->rq->id;
                        ind_tbl->queues[i] = queues[i];
                }
                k = i; /* Retain value of i for use in error case. */
                for (j = 0; k != rqt_n; ++k, ++j)
                        rqt_attr->rq_list[k] = rqt_attr->rq_list[j];
                ind_tbl->rqt = mlx5_devx_cmd_create_rqt(priv->sh->ctx,
                                                        rqt_attr);
                mlx5_free(rqt_attr);
                if (!ind_tbl->rqt) {
                        DRV_LOG(ERR, "port %u cannot create DevX RQT",
                                dev->data->port_id);
                        rte_errno = errno;
                        goto error;
                }
                ind_tbl->queues_n = queues_n;
        }
        rte_atomic32_inc(&ind_tbl->refcnt);
        LIST_INSERT_HEAD(&priv->ind_tbls, ind_tbl, next);
        return ind_tbl;
error:
        for (j = 0; j < i; j++)
                mlx5_rxq_release(dev, ind_tbl->queues[j]);
        mlx5_free(ind_tbl);
        DEBUG("port %u cannot create indirection table", dev->data->port_id);
        return NULL;
}

/**
 * Get an indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param queues
 *   Queues entering in the indirection table.
 * @param queues_n
 *   Number of queues in the array.
 *
 * @return
 *   An indirection table if found.
 */
static struct mlx5_ind_table_obj *
mlx5_ind_table_obj_get(struct rte_eth_dev *dev, const uint16_t *queues,
                       uint32_t queues_n)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl;

        LIST_FOREACH(ind_tbl, &priv->ind_tbls, next) {
                if ((ind_tbl->queues_n == queues_n) &&
                    (memcmp(ind_tbl->queues, queues,
                            ind_tbl->queues_n * sizeof(ind_tbl->queues[0]))
                     == 0))
                        break;
        }
        if (ind_tbl) {
                unsigned int i;

                rte_atomic32_inc(&ind_tbl->refcnt);
                for (i = 0; i != ind_tbl->queues_n; ++i)
                        mlx5_rxq_get(dev, ind_tbl->queues[i]);
        }
        return ind_tbl;
}

/**
 * Release an indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param ind_table
 *   Indirection table to release.
 *
 * @return
 *   1 while a reference on it exists, 0 when freed.
 */
static int
mlx5_ind_table_obj_release(struct rte_eth_dev *dev,
                           struct mlx5_ind_table_obj *ind_tbl)
{
        unsigned int i;

        if (rte_atomic32_dec_and_test(&ind_tbl->refcnt)) {
                if (ind_tbl->type == MLX5_IND_TBL_TYPE_IBV)
                        claim_zero(mlx5_glue->destroy_rwq_ind_table
                                                        (ind_tbl->ind_table));
                else if (ind_tbl->type == MLX5_IND_TBL_TYPE_DEVX)
                        claim_zero(mlx5_devx_cmd_destroy(ind_tbl->rqt));
        }
        for (i = 0; i != ind_tbl->queues_n; ++i)
                claim_nonzero(mlx5_rxq_release(dev, ind_tbl->queues[i]));
        if (!rte_atomic32_read(&ind_tbl->refcnt)) {
                LIST_REMOVE(ind_tbl, next);
                mlx5_free(ind_tbl);
                return 0;
        }
        return 1;
}

/**
 * Verify the Rx Queue list is empty
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The number of object not released.
 */
int
mlx5_ind_table_obj_verify(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl;
        int ret = 0;

        LIST_FOREACH(ind_tbl, &priv->ind_tbls, next) {
                DRV_LOG(DEBUG,
                        "port %u indirection table obj %p still referenced",
                        dev->data->port_id, (void *)ind_tbl);
                ++ret;
        }
        return ret;
}

/**
 * Create an Rx Hash queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param rss_key
 *   RSS key for the Rx hash queue.
 * @param rss_key_len
 *   RSS key length.
 * @param hash_fields
 *   Verbs protocol hash field to make the RSS on.
 * @param queues
 *   Queues entering in hash queue. In case of empty hash_fields only the
 *   first queue index will be taken for the indirection table.
 * @param queues_n
 *   Number of queues.
 * @param tunnel
 *   Tunnel type.
 *
 * @return
 *   The Verbs/DevX object initialised index, 0 otherwise and rte_errno is set.
 */
uint32_t
mlx5_hrxq_new(struct rte_eth_dev *dev,
              const uint8_t *rss_key, uint32_t rss_key_len,
              uint64_t hash_fields,
              const uint16_t *queues, uint32_t queues_n,
              int tunnel __rte_unused)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;
        uint32_t hrxq_idx = 0;
        struct ibv_qp *qp = NULL;
        struct mlx5_ind_table_obj *ind_tbl;
        int err;
        struct mlx5_devx_obj *tir = NULL;
        struct mlx5_rxq_data *rxq_data = (*priv->rxqs)[queues[0]];
        struct mlx5_rxq_ctrl *rxq_ctrl =
                container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);

        queues_n = hash_fields ? queues_n : 1;
        ind_tbl = mlx5_ind_table_obj_get(dev, queues, queues_n);
        if (!ind_tbl) {
                enum mlx5_ind_tbl_type type;

                type = rxq_ctrl->obj->type == MLX5_RXQ_OBJ_TYPE_IBV ?
                                MLX5_IND_TBL_TYPE_IBV : MLX5_IND_TBL_TYPE_DEVX;
                ind_tbl = mlx5_ind_table_obj_new(dev, queues, queues_n, type);
        }
        if (!ind_tbl) {
                rte_errno = ENOMEM;
                return 0;
        }
        if (ind_tbl->type == MLX5_IND_TBL_TYPE_IBV) {
#ifdef HAVE_IBV_DEVICE_TUNNEL_SUPPORT
                struct mlx5dv_qp_init_attr qp_init_attr;

                memset(&qp_init_attr, 0, sizeof(qp_init_attr));
                if (tunnel) {
                        qp_init_attr.comp_mask =
                                MLX5DV_QP_INIT_ATTR_MASK_QP_CREATE_FLAGS;
                        qp_init_attr.create_flags =
                                MLX5DV_QP_CREATE_TUNNEL_OFFLOADS;
                }
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
                if (dev->data->dev_conf.lpbk_mode) {
                        /*
                         * Allow packet sent from NIC loop back
                         * w/o source MAC check.
                         */
                        qp_init_attr.comp_mask |=
                                MLX5DV_QP_INIT_ATTR_MASK_QP_CREATE_FLAGS;
                        qp_init_attr.create_flags |=
                                MLX5DV_QP_CREATE_TIR_ALLOW_SELF_LOOPBACK_UC;
                }
#endif
                qp = mlx5_glue->dv_create_qp
                        (priv->sh->ctx,
                         &(struct ibv_qp_init_attr_ex){
                                .qp_type = IBV_QPT_RAW_PACKET,
                                .comp_mask =
                                        IBV_QP_INIT_ATTR_PD |
                                        IBV_QP_INIT_ATTR_IND_TABLE |
                                        IBV_QP_INIT_ATTR_RX_HASH,
                                .rx_hash_conf = (struct ibv_rx_hash_conf){
                                        .rx_hash_function =
                                                IBV_RX_HASH_FUNC_TOEPLITZ,
                                        .rx_hash_key_len = rss_key_len,
                                        .rx_hash_key =
                                                (void *)(uintptr_t)rss_key,
                                        .rx_hash_fields_mask = hash_fields,
                                },
                                .rwq_ind_tbl = ind_tbl->ind_table,
                                .pd = priv->sh->pd,
                          },
                          &qp_init_attr);
#else
                qp = mlx5_glue->create_qp_ex
                        (priv->sh->ctx,
                         &(struct ibv_qp_init_attr_ex){
                                .qp_type = IBV_QPT_RAW_PACKET,
                                .comp_mask =
                                        IBV_QP_INIT_ATTR_PD |
                                        IBV_QP_INIT_ATTR_IND_TABLE |
                                        IBV_QP_INIT_ATTR_RX_HASH,
                                .rx_hash_conf = (struct ibv_rx_hash_conf){
                                        .rx_hash_function =
                                                IBV_RX_HASH_FUNC_TOEPLITZ,
                                        .rx_hash_key_len = rss_key_len,
                                        .rx_hash_key =
                                                (void *)(uintptr_t)rss_key,
                                        .rx_hash_fields_mask = hash_fields,
                                },
                                .rwq_ind_tbl = ind_tbl->ind_table,
                                .pd = priv->sh->pd,
                         });
#endif
                if (!qp) {
                        rte_errno = errno;
                        goto error;
                }
        } else { /* ind_tbl->type == MLX5_IND_TBL_TYPE_DEVX */
                struct mlx5_devx_tir_attr tir_attr;
                uint32_t i;
                uint32_t lro = 1;

                /* Enable TIR LRO only if all the queues were configured for. */
                for (i = 0; i < queues_n; ++i) {
                        if (!(*priv->rxqs)[queues[i]]->lro) {
                                lro = 0;
                                break;
                        }
                }
                memset(&tir_attr, 0, sizeof(tir_attr));
                tir_attr.disp_type = MLX5_TIRC_DISP_TYPE_INDIRECT;
                tir_attr.rx_hash_fn = MLX5_RX_HASH_FN_TOEPLITZ;
                tir_attr.tunneled_offload_en = !!tunnel;
                /* If needed, translate hash_fields bitmap to PRM format. */
                if (hash_fields) {
#ifdef HAVE_IBV_DEVICE_TUNNEL_SUPPORT
                        struct mlx5_rx_hash_field_select *rx_hash_field_select =
                                        hash_fields & IBV_RX_HASH_INNER ?
                                        &tir_attr.rx_hash_field_selector_inner :
                                        &tir_attr.rx_hash_field_selector_outer;
#else
                        struct mlx5_rx_hash_field_select *rx_hash_field_select =
                                        &tir_attr.rx_hash_field_selector_outer;
#endif

                        /* 1 bit: 0: IPv4, 1: IPv6. */
                        rx_hash_field_select->l3_prot_type =
                                !!(hash_fields & MLX5_IPV6_IBV_RX_HASH);
                        /* 1 bit: 0: TCP, 1: UDP. */
                        rx_hash_field_select->l4_prot_type =
                                !!(hash_fields & MLX5_UDP_IBV_RX_HASH);
                        /* Bitmask which sets which fields to use in RX Hash. */
                        rx_hash_field_select->selected_fields =
                        ((!!(hash_fields & MLX5_L3_SRC_IBV_RX_HASH)) <<
                         MLX5_RX_HASH_FIELD_SELECT_SELECTED_FIELDS_SRC_IP) |
                        (!!(hash_fields & MLX5_L3_DST_IBV_RX_HASH)) <<
                         MLX5_RX_HASH_FIELD_SELECT_SELECTED_FIELDS_DST_IP |
                        (!!(hash_fields & MLX5_L4_SRC_IBV_RX_HASH)) <<
                         MLX5_RX_HASH_FIELD_SELECT_SELECTED_FIELDS_L4_SPORT |
                        (!!(hash_fields & MLX5_L4_DST_IBV_RX_HASH)) <<
                         MLX5_RX_HASH_FIELD_SELECT_SELECTED_FIELDS_L4_DPORT;
                }
                if (rxq_ctrl->obj->type == MLX5_RXQ_OBJ_TYPE_DEVX_HAIRPIN)
                        tir_attr.transport_domain = priv->sh->td->id;
                else
                        tir_attr.transport_domain = priv->sh->tdn;
                memcpy(tir_attr.rx_hash_toeplitz_key, rss_key,
                       MLX5_RSS_HASH_KEY_LEN);
                tir_attr.indirect_table = ind_tbl->rqt->id;
                if (dev->data->dev_conf.lpbk_mode)
                        tir_attr.self_lb_block =
                                        MLX5_TIRC_SELF_LB_BLOCK_BLOCK_UNICAST;
                if (lro) {
                        tir_attr.lro_timeout_period_usecs =
                                        priv->config.lro.timeout;
                        tir_attr.lro_max_msg_sz = priv->max_lro_msg_size;
                        tir_attr.lro_enable_mask =
                                        MLX5_TIRC_LRO_ENABLE_MASK_IPV4_LRO |
                                        MLX5_TIRC_LRO_ENABLE_MASK_IPV6_LRO;
                }
                tir = mlx5_devx_cmd_create_tir(priv->sh->ctx, &tir_attr);
                if (!tir) {
                        DRV_LOG(ERR, "port %u cannot create DevX TIR",
                                dev->data->port_id);
                        rte_errno = errno;
                        goto error;
                }
        }
        hrxq = mlx5_ipool_zmalloc(priv->sh->ipool[MLX5_IPOOL_HRXQ], &hrxq_idx);
        if (!hrxq)
                goto error;
        hrxq->ind_table = ind_tbl;
        if (ind_tbl->type == MLX5_IND_TBL_TYPE_IBV) {
                hrxq->qp = qp;
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
                hrxq->action =
                        mlx5_glue->dv_create_flow_action_dest_ibv_qp(hrxq->qp);
                if (!hrxq->action) {
                        rte_errno = errno;
                        goto error;
                }
#endif
        } else { /* ind_tbl->type == MLX5_IND_TBL_TYPE_DEVX */
                hrxq->tir = tir;
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
                hrxq->action = mlx5_glue->dv_create_flow_action_dest_devx_tir
                                                        (hrxq->tir->obj);
                if (!hrxq->action) {
                        rte_errno = errno;
                        goto error;
                }
#endif
        }
        hrxq->rss_key_len = rss_key_len;
        hrxq->hash_fields = hash_fields;
        memcpy(hrxq->rss_key, rss_key, rss_key_len);
        rte_atomic32_inc(&hrxq->refcnt);
        ILIST_INSERT(priv->sh->ipool[MLX5_IPOOL_HRXQ], &priv->hrxqs, hrxq_idx,
                     hrxq, next);
        return hrxq_idx;
error:
        err = rte_errno; /* Save rte_errno before cleanup. */
        mlx5_ind_table_obj_release(dev, ind_tbl);
        if (qp)
                claim_zero(mlx5_glue->destroy_qp(qp));
        else if (tir)
                claim_zero(mlx5_devx_cmd_destroy(tir));
        rte_errno = err; /* Restore rte_errno. */
        return 0;
}

/**
 * Get an Rx Hash queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param rss_conf
 *   RSS configuration for the Rx hash queue.
 * @param queues
 *   Queues entering in hash queue. In case of empty hash_fields only the
 *   first queue index will be taken for the indirection table.
 * @param queues_n
 *   Number of queues.
 *
 * @return
 *   An hash Rx queue index on success.
 */
uint32_t
mlx5_hrxq_get(struct rte_eth_dev *dev,
              const uint8_t *rss_key, uint32_t rss_key_len,
              uint64_t hash_fields,
              const uint16_t *queues, uint32_t queues_n)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;
        uint32_t idx;

        queues_n = hash_fields ? queues_n : 1;
        ILIST_FOREACH(priv->sh->ipool[MLX5_IPOOL_HRXQ], priv->hrxqs, idx,
                      hrxq, next) {
                struct mlx5_ind_table_obj *ind_tbl;

                if (hrxq->rss_key_len != rss_key_len)
                        continue;
                if (memcmp(hrxq->rss_key, rss_key, rss_key_len))
                        continue;
                if (hrxq->hash_fields != hash_fields)
                        continue;
                ind_tbl = mlx5_ind_table_obj_get(dev, queues, queues_n);
                if (!ind_tbl)
                        continue;
                if (ind_tbl != hrxq->ind_table) {
                        mlx5_ind_table_obj_release(dev, ind_tbl);
                        continue;
                }
                rte_atomic32_inc(&hrxq->refcnt);
                return idx;
        }
        return 0;
}

/**
 * Release the hash Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param hrxq
 *   Index to Hash Rx queue to release.
 *
 * @return
 *   1 while a reference on it exists, 0 when freed.
 */
int
mlx5_hrxq_release(struct rte_eth_dev *dev, uint32_t hrxq_idx)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;

        hrxq = mlx5_ipool_get(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq_idx);
        if (!hrxq)
                return 0;
        if (rte_atomic32_dec_and_test(&hrxq->refcnt)) {
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
                mlx5_glue->destroy_flow_action(hrxq->action);
#endif
                if (hrxq->ind_table->type == MLX5_IND_TBL_TYPE_IBV)
                        claim_zero(mlx5_glue->destroy_qp(hrxq->qp));
                else /* hrxq->ind_table->type == MLX5_IND_TBL_TYPE_DEVX */
                        claim_zero(mlx5_devx_cmd_destroy(hrxq->tir));
                mlx5_ind_table_obj_release(dev, hrxq->ind_table);
                ILIST_REMOVE(priv->sh->ipool[MLX5_IPOOL_HRXQ], &priv->hrxqs,
                             hrxq_idx, hrxq, next);
                mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq_idx);
                return 0;
        }
        claim_nonzero(mlx5_ind_table_obj_release(dev, hrxq->ind_table));
        return 1;
}

/**
 * Verify the Rx Queue list is empty
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The number of object not released.
 */
int
mlx5_hrxq_verify(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;
        uint32_t idx;
        int ret = 0;

        ILIST_FOREACH(priv->sh->ipool[MLX5_IPOOL_HRXQ], priv->hrxqs, idx,
                      hrxq, next) {
                DRV_LOG(DEBUG,
                        "port %u hash Rx queue %p still referenced",
                        dev->data->port_id, (void *)hrxq);
                ++ret;
        }
        return ret;
}

/**
 * Create a drop Rx queue Verbs/DevX object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_rxq_obj *
mlx5_rxq_obj_drop_new(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct ibv_context *ctx = priv->sh->ctx;
        struct ibv_cq *cq;
        struct ibv_wq *wq = NULL;
        struct mlx5_rxq_obj *rxq;

        if (priv->drop_queue.rxq)
                return priv->drop_queue.rxq;
        cq = mlx5_glue->create_cq(ctx, 1, NULL, NULL, 0);
        if (!cq) {
                DEBUG("port %u cannot allocate CQ for drop queue",
                      dev->data->port_id);
                rte_errno = errno;
                goto error;
        }
        wq = mlx5_glue->create_wq(ctx,
                 &(struct ibv_wq_init_attr){
                        .wq_type = IBV_WQT_RQ,
                        .max_wr = 1,
                        .max_sge = 1,
                        .pd = priv->sh->pd,
                        .cq = cq,
                 });
        if (!wq) {
                DEBUG("port %u cannot allocate WQ for drop queue",
                      dev->data->port_id);
                rte_errno = errno;
                goto error;
        }
        rxq = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*rxq), 0, SOCKET_ID_ANY);
        if (!rxq) {
                DEBUG("port %u cannot allocate drop Rx queue memory",
                      dev->data->port_id);
                rte_errno = ENOMEM;
                goto error;
        }
        rxq->ibv_cq = cq;
        rxq->wq = wq;
        priv->drop_queue.rxq = rxq;
        return rxq;
error:
        if (wq)
                claim_zero(mlx5_glue->destroy_wq(wq));
        if (cq)
                claim_zero(mlx5_glue->destroy_cq(cq));
        return NULL;
}

/**
 * Release a drop Rx queue Verbs/DevX object.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
static void
mlx5_rxq_obj_drop_release(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_obj *rxq = priv->drop_queue.rxq;

        if (rxq->wq)
                claim_zero(mlx5_glue->destroy_wq(rxq->wq));
        if (rxq->ibv_cq)
                claim_zero(mlx5_glue->destroy_cq(rxq->ibv_cq));
        mlx5_free(rxq);
        priv->drop_queue.rxq = NULL;
}

/**
 * Create a drop indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
static struct mlx5_ind_table_obj *
mlx5_ind_table_obj_drop_new(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl;
        struct mlx5_rxq_obj *rxq;
        struct mlx5_ind_table_obj tmpl;

        rxq = mlx5_rxq_obj_drop_new(dev);
        if (!rxq)
                return NULL;
        tmpl.ind_table = mlx5_glue->create_rwq_ind_table
                (priv->sh->ctx,
                 &(struct ibv_rwq_ind_table_init_attr){
                        .log_ind_tbl_size = 0,
                        .ind_tbl = &rxq->wq,
                        .comp_mask = 0,
                 });
        if (!tmpl.ind_table) {
                DEBUG("port %u cannot allocate indirection table for drop"
                      " queue",
                      dev->data->port_id);
                rte_errno = errno;
                goto error;
        }
        ind_tbl = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*ind_tbl), 0,
                              SOCKET_ID_ANY);
        if (!ind_tbl) {
                rte_errno = ENOMEM;
                goto error;
        }
        ind_tbl->ind_table = tmpl.ind_table;
        return ind_tbl;
error:
        mlx5_rxq_obj_drop_release(dev);
        return NULL;
}

/**
 * Release a drop indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
static void
mlx5_ind_table_obj_drop_release(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl = priv->drop_queue.hrxq->ind_table;

        claim_zero(mlx5_glue->destroy_rwq_ind_table(ind_tbl->ind_table));
        mlx5_rxq_obj_drop_release(dev);
        mlx5_free(ind_tbl);
        priv->drop_queue.hrxq->ind_table = NULL;
}

/**
 * Create a drop Rx Hash queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The Verbs/DevX object initialised, NULL otherwise and rte_errno is set.
 */
struct mlx5_hrxq *
mlx5_hrxq_drop_new(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl = NULL;
        struct ibv_qp *qp = NULL;
        struct mlx5_hrxq *hrxq = NULL;

        if (priv->drop_queue.hrxq) {
                rte_atomic32_inc(&priv->drop_queue.hrxq->refcnt);
                return priv->drop_queue.hrxq;
        }
        hrxq = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*hrxq), 0, SOCKET_ID_ANY);
        if (!hrxq) {
                DRV_LOG(WARNING,
                        "port %u cannot allocate memory for drop queue",
                        dev->data->port_id);
                rte_errno = ENOMEM;
                goto error;
        }
        priv->drop_queue.hrxq = hrxq;
        ind_tbl = mlx5_ind_table_obj_drop_new(dev);
        if (!ind_tbl)
                goto error;
        hrxq->ind_table = ind_tbl;
        qp = mlx5_glue->create_qp_ex(priv->sh->ctx,
                 &(struct ibv_qp_init_attr_ex){
                        .qp_type = IBV_QPT_RAW_PACKET,
                        .comp_mask =
                                IBV_QP_INIT_ATTR_PD |
                                IBV_QP_INIT_ATTR_IND_TABLE |
                                IBV_QP_INIT_ATTR_RX_HASH,
                        .rx_hash_conf = (struct ibv_rx_hash_conf){
                                .rx_hash_function =
                                        IBV_RX_HASH_FUNC_TOEPLITZ,
                                .rx_hash_key_len = MLX5_RSS_HASH_KEY_LEN,
                                .rx_hash_key = rss_hash_default_key,
                                .rx_hash_fields_mask = 0,
                                },
                        .rwq_ind_tbl = ind_tbl->ind_table,
                        .pd = priv->sh->pd
                 });
        if (!qp) {
                DEBUG("port %u cannot allocate QP for drop queue",
                      dev->data->port_id);
                rte_errno = errno;
                goto error;
        }
        hrxq->qp = qp;
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
        hrxq->action = mlx5_glue->dv_create_flow_action_dest_ibv_qp(hrxq->qp);
        if (!hrxq->action) {
                rte_errno = errno;
                goto error;
        }
#endif
        rte_atomic32_set(&hrxq->refcnt, 1);
        return hrxq;
error:
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
        if (hrxq && hrxq->action)
                mlx5_glue->destroy_flow_action(hrxq->action);
#endif
        if (qp)
                claim_zero(mlx5_glue->destroy_qp(hrxq->qp));
        if (ind_tbl)
                mlx5_ind_table_obj_drop_release(dev);
        if (hrxq) {
                priv->drop_queue.hrxq = NULL;
                mlx5_free(hrxq);
        }
        return NULL;
}

/**
 * Release a drop hash Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
void
mlx5_hrxq_drop_release(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq = priv->drop_queue.hrxq;

        if (rte_atomic32_dec_and_test(&hrxq->refcnt)) {
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
                mlx5_glue->destroy_flow_action(hrxq->action);
#endif
                claim_zero(mlx5_glue->destroy_qp(hrxq->qp));
                mlx5_ind_table_obj_drop_release(dev);
                mlx5_free(hrxq);
                priv->drop_queue.hrxq = NULL;
        }
}


/**
 * Set the Rx queue timestamp conversion parameters
 *
 * @param[in] dev
 *   Pointer to the Ethernet device structure.
 */
void
mlx5_rxq_timestamp_set(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_dev_ctx_shared *sh = priv->sh;
        struct mlx5_rxq_data *data;
        unsigned int i;

        for (i = 0; i != priv->rxqs_n; ++i) {
                if (!(*priv->rxqs)[i])
                        continue;
                data = (*priv->rxqs)[i];
                data->sh = sh;
                data->rt_timestamp = priv->config.rt_timestamp;
        }
}