common/mlx5: share protection domain object

[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 <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_malloc.h>

#include "mlx5_defs.h"
#include "mlx5.h"
#include "mlx5_tx.h"
#include "mlx5_rx.h"
#include "mlx5_utils.h"
#include "mlx5_autoconf.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.");

/**
 * Calculate the number of CQEs in CQ for the Rx queue.
 *
 *  @param rxq_data
 *     Pointer to receive queue structure.
 *
 * @return
 *   Number of CQEs in CQ.
 */
unsigned int
mlx5_rxq_cqe_num(struct mlx5_rxq_data *rxq_data)
{
        unsigned int cqe_n;
        unsigned int wqe_n = 1 << rxq_data->elts_n;

        if (mlx5_rxq_mprq_enabled(rxq_data))
                cqe_n = wqe_n * (1 << rxq_data->strd_num_n) - 1;
        else
                cqe_n = wqe_n - 1;
        return cqe_n;
}

/**
 * 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 MPRQ 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 MPRQ 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 = mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq) ?
                (1 << rxq_ctrl->rxq.elts_n) * (1 << rxq_ctrl->rxq.strd_num_n) :
                (1 << rxq_ctrl->rxq.elts_n);
        unsigned int i;
        int err;

        /* Iterate on segments. */
        for (i = 0; (i != elts_n); ++i) {
                struct mlx5_eth_rxseg *seg = &rxq_ctrl->rxq.rxseg[i % sges_n];
                struct rte_mbuf *buf;

                buf = rte_pktmbuf_alloc(seg->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);
                SET_DATA_OFF(buf, seg->offset);
                PORT(buf) = rxq_ctrl->rxq.port_id;
                DATA_LEN(buf) = seg->length;
                PKT_LEN(buf) = seg->length;
                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 SPRQ 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 SPRQ 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)
{
        int ret = 0;

        /**
         * For MPRQ we need to allocate both MPRQ buffers
         * for WQEs and simple mbufs for vector processing.
         */
        if (mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq))
                ret = rxq_alloc_elts_mprq(rxq_ctrl);
        return (ret || 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 %d WRs",
                rxq->port_id, rxq->idx, (1u << rxq->elts_n));
        if (rxq->mprq_bufs == NULL)
                return;
        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 = mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq) ?
                (1 << rxq->elts_n) * (1 << rxq->strd_num_n) :
                (1 << rxq->elts_n);
        const uint16_t q_mask = q_n - 1;
        uint16_t elts_ci = mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq) ?
                rxq->elts_ci : rxq->rq_ci;
        uint16_t used = q_n - (elts_ci - rxq->rq_pi);
        uint16_t i;

        DRV_LOG(DEBUG, "port %u Rx queue %u freeing %d WRs",
                PORT_ID(rxq_ctrl->priv), rxq->idx, q_n);
        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)[(elts_ci + i) & q_mask] = NULL;
                rxq->rq_pi = elts_ci;
        }
        for (i = 0; i != q_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)
{
        /*
         * For MPRQ we need to allocate both MPRQ buffers
         * for WQEs and simple mbufs for vector processing.
         */
        if (mlx5_rxq_mprq_enabled(&rxq_ctrl->rxq))
                rxq_free_elts_mprq(rxq_ctrl);
        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_RSS_HASH);

        if (!config->mprq.enabled)
                offloads |= RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT;
        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 (__atomic_load_n(&rxq_ctrl->refcnt, __ATOMIC_RELAXED) == 1);
}

/* Fetches and drops all SW-owned and error CQEs to synchronize CQ. */
static void
rxq_sync_cq(struct mlx5_rxq_data *rxq)
{
        const uint16_t cqe_n = 1 << rxq->cqe_n;
        const uint16_t cqe_mask = cqe_n - 1;
        volatile struct mlx5_cqe *cqe;
        int ret, i;

        i = cqe_n;
        do {
                cqe = &(*rxq->cqes)[rxq->cq_ci & cqe_mask];
                ret = check_cqe(cqe, cqe_n, rxq->cq_ci);
                if (ret == MLX5_CQE_STATUS_HW_OWN)
                        break;
                if (ret == MLX5_CQE_STATUS_ERR) {
                        rxq->cq_ci++;
                        continue;
                }
                MLX5_ASSERT(ret == MLX5_CQE_STATUS_SW_OWN);
                if (MLX5_CQE_FORMAT(cqe->op_own) != MLX5_COMPRESSED) {
                        rxq->cq_ci++;
                        continue;
                }
                /* Compute the next non compressed CQE. */
                rxq->cq_ci += rte_be_to_cpu_32(cqe->byte_cnt);

        } while (--i);
        /* Move all CQEs to HW ownership, including possible MiniCQEs. */
        for (i = 0; i < cqe_n; i++) {
                cqe = &(*rxq->cqes)[i];
                cqe->op_own = MLX5_CQE_INVALIDATE;
        }
        /* Resync CQE and WQE (WQ in RESET state). */
        rte_io_wmb();
        *rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
        rte_io_wmb();
        *rxq->rq_db = rte_cpu_to_be_32(0);
        rte_io_wmb();
}

/**
 * Rx queue stop. Device queue goes to the RESET state,
 * all involved mbufs are freed from WQ.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_queue_stop_primary(struct rte_eth_dev *dev, uint16_t idx)
{
        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 ret;

        MLX5_ASSERT(rte_eal_process_type() == RTE_PROC_PRIMARY);
        ret = priv->obj_ops.rxq_obj_modify(rxq_ctrl->obj, MLX5_RXQ_MOD_RDY2RST);
        if (ret) {
                DRV_LOG(ERR, "Cannot change Rx WQ state to RESET:  %s",
                        strerror(errno));
                rte_errno = errno;
                return ret;
        }
        /* Remove all processes CQEs. */
        rxq_sync_cq(rxq);
        /* Free all involved mbufs. */
        rxq_free_elts(rxq_ctrl);
        /* Set the actual queue state. */
        dev->data->rx_queue_state[idx] = RTE_ETH_QUEUE_STATE_STOPPED;
        return 0;
}

/**
 * Rx queue stop. Device queue goes to the RESET state,
 * all involved mbufs are freed from WQ.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_queue_stop(struct rte_eth_dev *dev, uint16_t idx)
{
        eth_rx_burst_t pkt_burst = dev->rx_pkt_burst;
        int ret;

        if (rte_eth_dev_is_rx_hairpin_queue(dev, idx)) {
                DRV_LOG(ERR, "Hairpin queue can't be stopped");
                rte_errno = EINVAL;
                return -EINVAL;
        }
        if (dev->data->rx_queue_state[idx] == RTE_ETH_QUEUE_STATE_STOPPED)
                return 0;
        /*
         * Vectorized Rx burst requires the CQ and RQ indices
         * synchronized, that might be broken on RQ restart
         * and cause Rx malfunction, so queue stopping is
         * not supported if vectorized Rx burst is engaged.
         * The routine pointer depends on the process
         * type, should perform check there.
         */
        if (pkt_burst == mlx5_rx_burst_vec) {
                DRV_LOG(ERR, "Rx queue stop is not supported "
                        "for vectorized Rx");
                rte_errno = EINVAL;
                return -EINVAL;
        }
        if (rte_eal_process_type() ==  RTE_PROC_SECONDARY) {
                ret = mlx5_mp_os_req_queue_control(dev, idx,
                                                   MLX5_MP_REQ_QUEUE_RX_STOP);
        } else {
                ret = mlx5_rx_queue_stop_primary(dev, idx);
        }
        return ret;
}

/**
 * Rx queue start. Device queue goes to the ready state,
 * all required mbufs are allocated and WQ is replenished.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_queue_start_primary(struct rte_eth_dev *dev, uint16_t idx)
{
        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 ret;

        MLX5_ASSERT(rte_eal_process_type() ==  RTE_PROC_PRIMARY);
        /* Allocate needed buffers. */
        ret = rxq_alloc_elts(rxq_ctrl);
        if (ret) {
                DRV_LOG(ERR, "Cannot reallocate buffers for Rx WQ");
                rte_errno = errno;
                return ret;
        }
        rte_io_wmb();
        *rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
        rte_io_wmb();
        /* Reset RQ consumer before moving queue to READY state. */
        *rxq->rq_db = rte_cpu_to_be_32(0);
        rte_io_wmb();
        ret = priv->obj_ops.rxq_obj_modify(rxq_ctrl->obj, MLX5_RXQ_MOD_RST2RDY);
        if (ret) {
                DRV_LOG(ERR, "Cannot change Rx WQ state to READY:  %s",
                        strerror(errno));
                rte_errno = errno;
                return ret;
        }
        /* Reinitialize RQ - set WQEs. */
        mlx5_rxq_initialize(rxq);
        rxq->err_state = MLX5_RXQ_ERR_STATE_NO_ERROR;
        /* Set actual queue state. */
        dev->data->rx_queue_state[idx] = RTE_ETH_QUEUE_STATE_STARTED;
        return 0;
}

/**
 * Rx queue start. Device queue goes to the ready state,
 * all required mbufs are allocated and WQ is replenished.
 *
 * @param dev
 *   Pointer to Ethernet device structure.
 * @param idx
 *   RX queue index.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_rx_queue_start(struct rte_eth_dev *dev, uint16_t idx)
{
        int ret;

        if (rte_eth_dev_is_rx_hairpin_queue(dev, idx)) {
                DRV_LOG(ERR, "Hairpin queue can't be started");
                rte_errno = EINVAL;
                return -EINVAL;
        }
        if (dev->data->rx_queue_state[idx] == RTE_ETH_QUEUE_STATE_STARTED)
                return 0;
        if (rte_eal_process_type() ==  RTE_PROC_SECONDARY) {
                ret = mlx5_mp_os_req_queue_control(dev, idx,
                                                   MLX5_MP_REQ_QUEUE_RX_START);
        } else {
                ret = mlx5_rx_queue_start_primary(dev, idx);
        }
        return ret;
}

/**
 * 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);
        struct rte_eth_rxseg_split *rx_seg =
                                (struct rte_eth_rxseg_split *)conf->rx_seg;
        struct rte_eth_rxseg_split rx_single = {.mp = mp};
        uint16_t n_seg = conf->rx_nseg;
        int res;

        if (mp) {
                /*
                 * The parameters should be checked on rte_eth_dev layer.
                 * If mp is specified it means the compatible configuration
                 * without buffer split feature tuning.
                 */
                rx_seg = &rx_single;
                n_seg = 1;
        }
        if (n_seg > 1) {
                uint64_t offloads = conf->offloads |
                                    dev->data->dev_conf.rxmode.offloads;

                /* The offloads should be checked on rte_eth_dev layer. */
                MLX5_ASSERT(offloads & DEV_RX_OFFLOAD_SCATTER);
                if (!(offloads & RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT)) {
                        DRV_LOG(ERR, "port %u queue index %u split "
                                     "offload not configured",
                                     dev->data->port_id, idx);
                        rte_errno = ENOSPC;
                        return -rte_errno;
                }
                MLX5_ASSERT(n_seg < MLX5_MAX_RXQ_NSEG);
        }
        res = mlx5_rx_queue_pre_setup(dev, idx, &desc);
        if (res)
                return res;
        rxq_ctrl = mlx5_rxq_new(dev, idx, desc, socket, conf, rx_seg, n_seg);
        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) {
                rte_errno = EINVAL;
                DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue index %u"
                        " peer count is %u", dev->data->port_id,
                        idx, hairpin_conf->peer_count);
                return -rte_errno;
        }
        if (hairpin_conf->peers[0].port == dev->data->port_id) {
                if (hairpin_conf->peers[0].queue >= priv->txqs_n) {
                        rte_errno = EINVAL;
                        DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue"
                                " index %u, Tx %u is larger than %u",
                                dev->data->port_id, idx,
                                hairpin_conf->peers[0].queue, priv->txqs_n);
                        return -rte_errno;
                }
        } else {
                if (hairpin_conf->manual_bind == 0 ||
                    hairpin_conf->tx_explicit == 0) {
                        rte_errno = EINVAL;
                        DRV_LOG(ERR, "port %u unable to setup Rx hairpin queue"
                                " index %u peer port %u with attributes %u %u",
                                dev->data->port_id, idx,
                                hairpin_conf->peers[0].port,
                                hairpin_conf->manual_bind,
                                hairpin_conf->tx_explicit);
                        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 dev
 *   Pointer to Ethernet device structure.
 * @param qid
 *   Receive queue index.
 */
void
mlx5_rx_queue_release(struct rte_eth_dev *dev, uint16_t qid)
{
        struct mlx5_rxq_data *rxq = dev->data->rx_queues[qid];

        if (rxq == NULL)
                return;
        if (!mlx5_rxq_releasable(dev, qid))
                rte_panic("port %u Rx queue %u is still used by a flow and"
                          " cannot be removed\n", dev->data->port_id, qid);
        mlx5_rxq_release(dev, qid);
}

/**
 * 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_ctrl *rxq_ctrl = mlx5_rxq_get(dev, i);
                struct mlx5_rxq_obj *rxq_obj = rxq_ctrl ? rxq_ctrl->obj : NULL;
                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;
                        /* Decrease the rxq_ctrl's refcnt */
                        if (rxq_ctrl)
                                mlx5_rxq_release(dev, i);
                        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) {
                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().
                 */
                mlx5_rxq_release(dev, i);
        }
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_rxq_ctrl *rxq_ctrl;

        rxq_ctrl = mlx5_rxq_get(dev, rx_queue_id);
        if (!rxq_ctrl)
                goto error;
        if (rxq_ctrl->irq) {
                if (!rxq_ctrl->obj) {
                        mlx5_rxq_release(dev, rx_queue_id);
                        goto error;
                }
                mlx5_arm_cq(&rxq_ctrl->rxq, rxq_ctrl->rxq.cq_arm_sn);
        }
        mlx5_rxq_release(dev, rx_queue_id);
        return 0;
error:
        rte_errno = EINVAL;
        return -rte_errno;
}

/**
 * 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_ctrl *rxq_ctrl;
        int ret = 0;

        rxq_ctrl = mlx5_rxq_get(dev, rx_queue_id);
        if (!rxq_ctrl) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        if (!rxq_ctrl->obj)
                goto error;
        if (rxq_ctrl->irq) {
                ret = priv->obj_ops.rxq_event_get(rxq_ctrl->obj);
                if (ret < 0)
                        goto error;
                rxq_ctrl->rxq.cq_arm_sn++;
        }
        mlx5_rxq_release(dev, rx_queue_id);
        return 0;
error:
        /**
         * The ret variable may be EAGAIN which means the get_event function was
         * called before receiving one.
         */
        if (ret < 0)
                rte_errno = errno;
        else
                rte_errno = EINVAL;
        ret = rte_errno; /* Save rte_errno before cleanup. */
        mlx5_rxq_release(dev, rx_queue_id);
        if (ret != EAGAIN)
                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;
}

/**
 * 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;
        __atomic_store_n(&buf->refcnt, 1, __ATOMIC_RELAXED);
        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;
        int ret;

        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;
        }
        ret = mlx5_mr_mempool_register(&priv->sh->share_cache,
                                       priv->sh->cdev->pd, mp, &priv->mp_id);
        if (ret < 0 && rte_errno != EEXIST) {
                ret = rte_errno;
                DRV_LOG(ERR, "port %u failed to register a mempool for Multi-Packet RQ",
                        dev->data->port_id);
                rte_mempool_free(mp);
                rte_errno = ret;
                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,
             const struct rte_eth_rxseg_split *rx_seg, uint16_t n_seg)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_rxq_ctrl *tmpl;
        unsigned int mb_len = rte_pktmbuf_data_room_size(rx_seg[0].mp);
        struct mlx5_dev_config *config = &priv->config;
        uint64_t offloads = conf->offloads |
                           dev->data->dev_conf.rxmode.offloads;
        unsigned int lro_on_queue = !!(offloads & DEV_RX_OFFLOAD_TCP_LRO);
        unsigned int max_rx_pktlen = lro_on_queue ?
                        dev->data->dev_conf.rxmode.max_lro_pkt_size :
                        dev->data->mtu + (unsigned int)RTE_ETHER_HDR_LEN +
                                RTE_ETHER_CRC_LEN;
        unsigned int non_scatter_min_mbuf_size = max_rx_pktlen +
                                                        RTE_PKTMBUF_HEADROOM;
        unsigned int max_lro_size = 0;
        unsigned int first_mb_free_size = mb_len - RTE_PKTMBUF_HEADROOM;
        const int mprq_en = mlx5_check_mprq_support(dev) > 0 && n_seg == 1 &&
                            !rx_seg[0].offset && !rx_seg[0].length;
        unsigned int mprq_stride_nums = config->mprq.stride_num_n ?
                config->mprq.stride_num_n : MLX5_MPRQ_STRIDE_NUM_N;
        unsigned int 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;
        unsigned int 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));
        /*
         * 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;
        const struct rte_eth_rxseg_split *qs_seg = rx_seg;
        unsigned int tail_len;

        tmpl = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO,
                sizeof(*tmpl) + desc_n * sizeof(struct rte_mbuf *) +
                (!!mprq_en) *
                (desc >> mprq_stride_nums) * sizeof(struct mlx5_mprq_buf *),
                0, socket);
        if (!tmpl) {
                rte_errno = ENOMEM;
                return NULL;
        }
        MLX5_ASSERT(n_seg && n_seg <= MLX5_MAX_RXQ_NSEG);
        /*
         * Build the array of actual buffer offsets and lengths.
         * Pad with the buffers from the last memory pool if
         * needed to handle max size packets, replace zero length
         * with the buffer length from the pool.
         */
        tail_len = max_rx_pktlen;
        do {
                struct mlx5_eth_rxseg *hw_seg =
                                        &tmpl->rxq.rxseg[tmpl->rxq.rxseg_n];
                uint32_t buf_len, offset, seg_len;

                /*
                 * For the buffers beyond descriptions offset is zero,
                 * the first buffer contains head room.
                 */
                buf_len = rte_pktmbuf_data_room_size(qs_seg->mp);
                offset = (tmpl->rxq.rxseg_n >= n_seg ? 0 : qs_seg->offset) +
                         (tmpl->rxq.rxseg_n ? 0 : RTE_PKTMBUF_HEADROOM);
                /*
                 * For the buffers beyond descriptions the length is
                 * pool buffer length, zero lengths are replaced with
                 * pool buffer length either.
                 */
                seg_len = tmpl->rxq.rxseg_n >= n_seg ? buf_len :
                                                       qs_seg->length ?
                                                       qs_seg->length :
                                                       (buf_len - offset);
                /* Check is done in long int, now overflows. */
                if (buf_len < seg_len + offset) {
                        DRV_LOG(ERR, "port %u Rx queue %u: Split offset/length "
                                     "%u/%u can't be satisfied",
                                     dev->data->port_id, idx,
                                     qs_seg->length, qs_seg->offset);
                        rte_errno = EINVAL;
                        goto error;
                }
                if (seg_len > tail_len)
                        seg_len = buf_len - offset;
                if (++tmpl->rxq.rxseg_n > MLX5_MAX_RXQ_NSEG) {
                        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,
                                tmpl->rxq.rxseg_n, max_rx_pktlen,
                                MLX5_MAX_RXQ_NSEG);
                        rte_errno = ENOTSUP;
                        goto error;
                }
                /* Build the actual scattering element in the queue object. */
                hw_seg->mp = qs_seg->mp;
                MLX5_ASSERT(offset <= UINT16_MAX);
                MLX5_ASSERT(seg_len <= UINT16_MAX);
                hw_seg->offset = (uint16_t)offset;
                hw_seg->length = (uint16_t)seg_len;
                /*
                 * Advance the segment descriptor, the padding is the based
                 * on the attributes of the last descriptor.
                 */
                if (tmpl->rxq.rxseg_n < n_seg)
                        qs_seg++;
                tail_len -= RTE_MIN(tail_len, seg_len);
        } while (tail_len || !rte_is_power_of_2(tmpl->rxq.rxseg_n));
        MLX5_ASSERT(tmpl->rxq.rxseg_n &&
                    tmpl->rxq.rxseg_n <= MLX5_MAX_RXQ_NSEG);
        if (tmpl->rxq.rxseg_n > 1 && !(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_pktlen,
                        RTE_PKTMBUF_HEADROOM);
                rte_errno = ENOSPC;
                goto error;
        }
        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;
        }
        /* Rx queues don't use this pointer, but we want a valid structure. */
        tmpl->rxq.mr_ctrl.dev_gen_ptr = &priv->sh->share_cache.dev_gen;
        tmpl->socket = socket;
        if (dev->data->dev_conf.intr_conf.rxq)
                tmpl->irq = 1;
        /*
         * 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_pktlen plus overhead is less than the max size
         *    of a stride or mprq_stride_size is specified by a user.
         *    Need to make sure that there are enough strides 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_pktlen,
                                       (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 (tmpl->rxq.rxseg_n == 1) {
                MLX5_ASSERT(max_rx_pktlen <= first_mb_free_size);
                tmpl->rxq.sges_n = 0;
                max_lro_size = max_rx_pktlen;
        } else if (offloads & DEV_RX_OFFLOAD_SCATTER) {
                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(tmpl->rxq.rxseg_n);
                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_pktlen,
                                1u << MLX5_MAX_LOG_RQ_SEGS);
                        rte_errno = ENOTSUP;
                        goto error;
                }
                tmpl->rxq.sges_n = sges_n;
                max_lro_size = max_rx_pktlen;
        }
        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);
        /* Configure Rx timestamp. */
        tmpl->rxq.hw_timestamp = !!(offloads & DEV_RX_OFFLOAD_TIMESTAMP);
        tmpl->rxq.timestamp_rx_flag = 0;
        if (tmpl->rxq.hw_timestamp && rte_mbuf_dyn_rx_timestamp_register(
                        &tmpl->rxq.timestamp_offset,
                        &tmpl->rxq.timestamp_rx_flag) != 0) {
                DRV_LOG(ERR, "Cannot register Rx timestamp field/flag");
                goto error;
        }
        /* 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 = rx_seg[0].mp;
        tmpl->rxq.elts_n = log2above(desc);
        tmpl->rxq.rq_repl_thresh =
                MLX5_VPMD_RXQ_RPLNSH_THRESH(desc_n);
        tmpl->rxq.elts =
                (struct rte_mbuf *(*)[desc_n])(tmpl + 1);
        tmpl->rxq.mprq_bufs =
                (struct mlx5_mprq_buf *(*)[desc])(*tmpl->rxq.elts + desc_n);
#ifndef RTE_ARCH_64
        tmpl->rxq.uar_lock_cq = &priv->sh->uar_lock_cq;
#endif
        tmpl->rxq.idx = idx;
        __atomic_fetch_add(&tmpl->refcnt, 1, __ATOMIC_RELAXED);
        LIST_INSERT_HEAD(&priv->rxqsctrl, tmpl, next);
        return tmpl;
error:
        mlx5_mr_btree_free(&tmpl->rxq.mr_ctrl.cache_bh);
        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;
        __atomic_fetch_add(&tmpl->refcnt, 1, __ATOMIC_RELAXED);
        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_data *rxq_data = (*priv->rxqs)[idx];
        struct mlx5_rxq_ctrl *rxq_ctrl = NULL;

        if (rxq_data) {
                rxq_ctrl = container_of(rxq_data, struct mlx5_rxq_ctrl, rxq);
                __atomic_fetch_add(&rxq_ctrl->refcnt, 1, __ATOMIC_RELAXED);
        }
        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 == NULL || (*priv->rxqs)[idx] == NULL)
                return 0;
        rxq_ctrl = container_of((*priv->rxqs)[idx], struct mlx5_rxq_ctrl, rxq);
        if (__atomic_sub_fetch(&rxq_ctrl->refcnt, 1, __ATOMIC_RELAXED) > 1)
                return 1;
        if (rxq_ctrl->obj) {
                priv->obj_ops.rxq_obj_release(rxq_ctrl->obj);
                LIST_REMOVE(rxq_ctrl->obj, next);
                mlx5_free(rxq_ctrl->obj);
                rxq_ctrl->obj = NULL;
        }
        if (rxq_ctrl->type == MLX5_RXQ_TYPE_STANDARD) {
                rxq_free_elts(rxq_ctrl);
                dev->data->rx_queue_state[idx] = RTE_ETH_QUEUE_STATE_STOPPED;
        }
        if (!__atomic_load_n(&rxq_ctrl->refcnt, __ATOMIC_RELAXED)) {
                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;
}

/**
 * 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;
}

/*
 * Get a Rx hairpin queue configuration.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param idx
 *   Rx queue index.
 *
 * @return
 *   Pointer to the configuration if a hairpin RX queue, otherwise NULL.
 */
const struct rte_eth_hairpin_conf *
mlx5_rxq_get_hairpin_conf(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);
                if (rxq_ctrl->type == MLX5_RXQ_TYPE_HAIRPIN)
                        return &rxq_ctrl->hairpin_conf;
        }
        return NULL;
}

/**
 * Match queues listed in arguments to queues contained in indirection table
 * object.
 *
 * @param ind_tbl
 *   Pointer to indirection table to match.
 * @param queues
 *   Queues to match to ques in indirection table.
 * @param queues_n
 *   Number of queues in the array.
 *
 * @return
 *   1 if all queues in indirection table match 0 othrwise.
 */
static int
mlx5_ind_table_obj_match_queues(const struct mlx5_ind_table_obj *ind_tbl,
                       const uint16_t *queues, uint32_t queues_n)
{
                return (ind_tbl->queues_n == queues_n) &&
                    (!memcmp(ind_tbl->queues, queues,
                            ind_tbl->queues_n * sizeof(ind_tbl->queues[0])));
}

/**
 * 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.
 */
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;

        rte_rwlock_read_lock(&priv->ind_tbls_lock);
        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)) {
                        __atomic_fetch_add(&ind_tbl->refcnt, 1,
                                           __ATOMIC_RELAXED);
                        break;
                }
        }
        rte_rwlock_read_unlock(&priv->ind_tbls_lock);
        return ind_tbl;
}

/**
 * Release an indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param ind_table
 *   Indirection table to release.
 * @param standalone
 *   Indirection table for Standalone queue.
 *
 * @return
 *   1 while a reference on it exists, 0 when freed.
 */
int
mlx5_ind_table_obj_release(struct rte_eth_dev *dev,
                           struct mlx5_ind_table_obj *ind_tbl,
                           bool standalone)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        unsigned int i, ret;

        rte_rwlock_write_lock(&priv->ind_tbls_lock);
        ret = __atomic_sub_fetch(&ind_tbl->refcnt, 1, __ATOMIC_RELAXED);
        if (!ret && !standalone)
                LIST_REMOVE(ind_tbl, next);
        rte_rwlock_write_unlock(&priv->ind_tbls_lock);
        if (ret)
                return 1;
        priv->obj_ops.ind_table_destroy(ind_tbl);
        for (i = 0; i != ind_tbl->queues_n; ++i)
                claim_nonzero(mlx5_rxq_release(dev, ind_tbl->queues[i]));
        mlx5_free(ind_tbl);
        return 0;
}

/**
 * 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;

        rte_rwlock_read_lock(&priv->ind_tbls_lock);
        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;
        }
        rte_rwlock_read_unlock(&priv->ind_tbls_lock);
        return ret;
}

/**
 * Setup an indirection table structure fields.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param ind_table
 *   Indirection table to modify.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_ind_table_obj_setup(struct rte_eth_dev *dev,
                         struct mlx5_ind_table_obj *ind_tbl)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        uint32_t queues_n = ind_tbl->queues_n;
        uint16_t *queues = ind_tbl->queues;
        unsigned int i, j;
        int ret = 0, err;
        const unsigned int n = rte_is_power_of_2(queues_n) ?
                               log2above(queues_n) :
                               log2above(priv->config.ind_table_max_size);

        for (i = 0; i != queues_n; ++i) {
                if (!mlx5_rxq_get(dev, queues[i])) {
                        ret = -rte_errno;
                        goto error;
                }
        }
        ret = priv->obj_ops.ind_table_new(dev, n, ind_tbl);
        if (ret)
                goto error;
        __atomic_fetch_add(&ind_tbl->refcnt, 1, __ATOMIC_RELAXED);
        return 0;
error:
        err = rte_errno;
        for (j = 0; j < i; j++)
                mlx5_rxq_release(dev, ind_tbl->queues[j]);
        rte_errno = err;
        DRV_LOG(DEBUG, "Port %u cannot setup indirection table.",
                dev->data->port_id);
        return ret;
}

/**
 * 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.
 * @param standalone
 *   Indirection table for Standalone queue.
 *
 * @return
 *   The Verbs/DevX object initialized, 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, bool standalone)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_ind_table_obj *ind_tbl;
        int ret;

        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->queues_n = queues_n;
        ind_tbl->queues = (uint16_t *)(ind_tbl + 1);
        memcpy(ind_tbl->queues, queues, queues_n * sizeof(*queues));
        ret = mlx5_ind_table_obj_setup(dev, ind_tbl);
        if (ret < 0) {
                mlx5_free(ind_tbl);
                return NULL;
        }
        if (!standalone) {
                rte_rwlock_write_lock(&priv->ind_tbls_lock);
                LIST_INSERT_HEAD(&priv->ind_tbls, ind_tbl, next);
                rte_rwlock_write_unlock(&priv->ind_tbls_lock);
        }
        return ind_tbl;
}

/**
 * Modify an indirection table.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param ind_table
 *   Indirection table to modify.
 * @param queues
 *   Queues replacement for the indirection table.
 * @param queues_n
 *   Number of queues in the array.
 * @param standalone
 *   Indirection table for Standalone queue.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_ind_table_obj_modify(struct rte_eth_dev *dev,
                          struct mlx5_ind_table_obj *ind_tbl,
                          uint16_t *queues, const uint32_t queues_n,
                          bool standalone)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        unsigned int i, j;
        int ret = 0, err;
        const unsigned int n = rte_is_power_of_2(queues_n) ?
                               log2above(queues_n) :
                               log2above(priv->config.ind_table_max_size);

        MLX5_ASSERT(standalone);
        RTE_SET_USED(standalone);
        if (__atomic_load_n(&ind_tbl->refcnt, __ATOMIC_RELAXED) > 1) {
                /*
                 * Modification of indirection ntables having more than 1
                 * reference unsupported. Intended for standalone indirection
                 * tables only.
                 */
                DRV_LOG(DEBUG,
                        "Port %u cannot modify indirection table (refcnt> 1).",
                        dev->data->port_id);
                rte_errno = EINVAL;
                return -rte_errno;
        }
        for (i = 0; i != queues_n; ++i) {
                if (!mlx5_rxq_get(dev, queues[i])) {
                        ret = -rte_errno;
                        goto error;
                }
        }
        MLX5_ASSERT(priv->obj_ops.ind_table_modify);
        ret = priv->obj_ops.ind_table_modify(dev, n, queues, queues_n, ind_tbl);
        if (ret)
                goto error;
        for (j = 0; j < ind_tbl->queues_n; j++)
                mlx5_rxq_release(dev, ind_tbl->queues[j]);
        ind_tbl->queues_n = queues_n;
        ind_tbl->queues = queues;
        return 0;
error:
        err = rte_errno;
        for (j = 0; j < i; j++)
                mlx5_rxq_release(dev, queues[j]);
        rte_errno = err;
        DRV_LOG(DEBUG, "Port %u cannot setup indirection table.",
                dev->data->port_id);
        return ret;
}

int
mlx5_hrxq_match_cb(void *tool_ctx __rte_unused, struct mlx5_list_entry *entry,
                   void *cb_ctx)
{
        struct mlx5_flow_cb_ctx *ctx = cb_ctx;
        struct mlx5_flow_rss_desc *rss_desc = ctx->data;
        struct mlx5_hrxq *hrxq = container_of(entry, typeof(*hrxq), entry);

        return (hrxq->rss_key_len != rss_desc->key_len ||
            memcmp(hrxq->rss_key, rss_desc->key, rss_desc->key_len) ||
            hrxq->hash_fields != rss_desc->hash_fields ||
            hrxq->ind_table->queues_n != rss_desc->queue_num ||
            memcmp(hrxq->ind_table->queues, rss_desc->queue,
            rss_desc->queue_num * sizeof(rss_desc->queue[0])));
}

/**
 * Modify an Rx Hash queue configuration.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param hrxq
 *   Index to Hash Rx queue to modify.
 * @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.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
mlx5_hrxq_modify(struct rte_eth_dev *dev, uint32_t hrxq_idx,
                 const uint8_t *rss_key, uint32_t rss_key_len,
                 uint64_t hash_fields,
                 const uint16_t *queues, uint32_t queues_n)
{
        int err;
        struct mlx5_ind_table_obj *ind_tbl = NULL;
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq =
                mlx5_ipool_get(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq_idx);
        int ret;

        if (!hrxq) {
                rte_errno = EINVAL;
                return -rte_errno;
        }
        /* validations */
        if (hrxq->rss_key_len != rss_key_len) {
                /* rss_key_len is fixed size 40 byte & not supposed to change */
                rte_errno = EINVAL;
                return -rte_errno;
        }
        queues_n = hash_fields ? queues_n : 1;
        if (mlx5_ind_table_obj_match_queues(hrxq->ind_table,
                                            queues, queues_n)) {
                ind_tbl = hrxq->ind_table;
        } else {
                if (hrxq->standalone) {
                        /*
                         * Replacement of indirection table unsupported for
                         * stanalone hrxq objects (used by shared RSS).
                         */
                        rte_errno = ENOTSUP;
                        return -rte_errno;
                }
                ind_tbl = mlx5_ind_table_obj_get(dev, queues, queues_n);
                if (!ind_tbl)
                        ind_tbl = mlx5_ind_table_obj_new(dev, queues, queues_n,
                                                         hrxq->standalone);
        }
        if (!ind_tbl) {
                rte_errno = ENOMEM;
                return -rte_errno;
        }
        MLX5_ASSERT(priv->obj_ops.hrxq_modify);
        ret = priv->obj_ops.hrxq_modify(dev, hrxq, rss_key,
                                        hash_fields, ind_tbl);
        if (ret) {
                rte_errno = errno;
                goto error;
        }
        if (ind_tbl != hrxq->ind_table) {
                MLX5_ASSERT(!hrxq->standalone);
                mlx5_ind_table_obj_release(dev, hrxq->ind_table,
                                           hrxq->standalone);
                hrxq->ind_table = ind_tbl;
        }
        hrxq->hash_fields = hash_fields;
        memcpy(hrxq->rss_key, rss_key, rss_key_len);
        return 0;
error:
        err = rte_errno;
        if (ind_tbl != hrxq->ind_table) {
                MLX5_ASSERT(!hrxq->standalone);
                mlx5_ind_table_obj_release(dev, ind_tbl, hrxq->standalone);
        }
        rte_errno = err;
        return -rte_errno;
}

static void
__mlx5_hrxq_remove(struct rte_eth_dev *dev, struct mlx5_hrxq *hrxq)
{
        struct mlx5_priv *priv = dev->data->dev_private;

#ifdef HAVE_IBV_FLOW_DV_SUPPORT
        mlx5_glue->destroy_flow_action(hrxq->action);
#endif
        priv->obj_ops.hrxq_destroy(hrxq);
        if (!hrxq->standalone) {
                mlx5_ind_table_obj_release(dev, hrxq->ind_table,
                                           hrxq->standalone);
        }
        mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq->idx);
}

/**
 * Release the hash Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param hrxq
 *   Index to Hash Rx queue to release.
 *
 * @param list
 *   mlx5 list pointer.
 * @param entry
 *   Hash queue entry pointer.
 */
void
mlx5_hrxq_remove_cb(void *tool_ctx, struct mlx5_list_entry *entry)
{
        struct rte_eth_dev *dev = tool_ctx;
        struct mlx5_hrxq *hrxq = container_of(entry, typeof(*hrxq), entry);

        __mlx5_hrxq_remove(dev, hrxq);
}

static struct mlx5_hrxq *
__mlx5_hrxq_create(struct rte_eth_dev *dev,
                   struct mlx5_flow_rss_desc *rss_desc)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        const uint8_t *rss_key = rss_desc->key;
        uint32_t rss_key_len =  rss_desc->key_len;
        bool standalone = !!rss_desc->shared_rss;
        const uint16_t *queues =
                standalone ? rss_desc->const_q : rss_desc->queue;
        uint32_t queues_n = rss_desc->queue_num;
        struct mlx5_hrxq *hrxq = NULL;
        uint32_t hrxq_idx = 0;
        struct mlx5_ind_table_obj *ind_tbl = rss_desc->ind_tbl;
        int ret;

        queues_n = rss_desc->hash_fields ? queues_n : 1;
        if (!ind_tbl)
                ind_tbl = mlx5_ind_table_obj_get(dev, queues, queues_n);
        if (!ind_tbl)
                ind_tbl = mlx5_ind_table_obj_new(dev, queues, queues_n,
                                                 standalone);
        if (!ind_tbl)
                return NULL;
        hrxq = mlx5_ipool_zmalloc(priv->sh->ipool[MLX5_IPOOL_HRXQ], &hrxq_idx);
        if (!hrxq)
                goto error;
        hrxq->standalone = standalone;
        hrxq->idx = hrxq_idx;
        hrxq->ind_table = ind_tbl;
        hrxq->rss_key_len = rss_key_len;
        hrxq->hash_fields = rss_desc->hash_fields;
        memcpy(hrxq->rss_key, rss_key, rss_key_len);
        ret = priv->obj_ops.hrxq_new(dev, hrxq, rss_desc->tunnel);
        if (ret < 0)
                goto error;
        return hrxq;
error:
        if (!rss_desc->ind_tbl)
                mlx5_ind_table_obj_release(dev, ind_tbl, standalone);
        if (hrxq)
                mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq_idx);
        return NULL;
}

struct mlx5_list_entry *
mlx5_hrxq_create_cb(void *tool_ctx, void *cb_ctx)
{
        struct rte_eth_dev *dev = tool_ctx;
        struct mlx5_flow_cb_ctx *ctx = cb_ctx;
        struct mlx5_flow_rss_desc *rss_desc = ctx->data;
        struct mlx5_hrxq *hrxq;

        hrxq = __mlx5_hrxq_create(dev, rss_desc);
        return hrxq ? &hrxq->entry : NULL;
}

struct mlx5_list_entry *
mlx5_hrxq_clone_cb(void *tool_ctx, struct mlx5_list_entry *entry,
                    void *cb_ctx __rte_unused)
{
        struct rte_eth_dev *dev = tool_ctx;
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;
        uint32_t hrxq_idx = 0;

        hrxq = mlx5_ipool_zmalloc(priv->sh->ipool[MLX5_IPOOL_HRXQ], &hrxq_idx);
        if (!hrxq)
                return NULL;
        memcpy(hrxq, entry, sizeof(*hrxq) + MLX5_RSS_HASH_KEY_LEN);
        hrxq->idx = hrxq_idx;
        return &hrxq->entry;
}

void
mlx5_hrxq_clone_free_cb(void *tool_ctx, struct mlx5_list_entry *entry)
{
        struct rte_eth_dev *dev = tool_ctx;
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq = container_of(entry, typeof(*hrxq), entry);

        mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq->idx);
}

/**
 * Get an Rx Hash queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param rss_desc
 *   RSS configuration for the Rx hash queue.
 *
 * @return
 *   An hash Rx queue index on success.
 */
uint32_t mlx5_hrxq_get(struct rte_eth_dev *dev,
                       struct mlx5_flow_rss_desc *rss_desc)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq;
        struct mlx5_list_entry *entry;
        struct mlx5_flow_cb_ctx ctx = {
                .data = rss_desc,
        };

        if (rss_desc->shared_rss) {
                hrxq = __mlx5_hrxq_create(dev, rss_desc);
        } else {
                entry = mlx5_list_register(priv->hrxqs, &ctx);
                if (!entry)
                        return 0;
                hrxq = container_of(entry, typeof(*hrxq), entry);
        }
        if (hrxq)
                return hrxq->idx;
        return 0;
}

/**
 * Release the hash Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 * @param hrxq_idx
 *   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 (!hrxq->standalone)
                return mlx5_list_unregister(priv->hrxqs, &hrxq->entry);
        __mlx5_hrxq_remove(dev, hrxq);
        return 0;
}

/**
 * Create a drop Rx Hash queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 *
 * @return
 *   The Verbs/DevX object initialized, NULL otherwise and rte_errno is set.
 */
struct mlx5_hrxq *
mlx5_drop_action_create(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq = NULL;
        int ret;

        if (priv->drop_queue.hrxq)
                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;
        hrxq->ind_table = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*hrxq->ind_table),
                                      0, SOCKET_ID_ANY);
        if (!hrxq->ind_table) {
                rte_errno = ENOMEM;
                goto error;
        }
        ret = priv->obj_ops.drop_action_create(dev);
        if (ret < 0)
                goto error;
        return hrxq;
error:
        if (hrxq) {
                if (hrxq->ind_table)
                        mlx5_free(hrxq->ind_table);
                priv->drop_queue.hrxq = NULL;
                mlx5_free(hrxq);
        }
        return NULL;
}

/**
 * Release a drop hash Rx queue.
 *
 * @param dev
 *   Pointer to Ethernet device.
 */
void
mlx5_drop_action_destroy(struct rte_eth_dev *dev)
{
        struct mlx5_priv *priv = dev->data->dev_private;
        struct mlx5_hrxq *hrxq = priv->drop_queue.hrxq;

        if (!priv->drop_queue.hrxq)
                return;
        priv->obj_ops.drop_action_destroy(dev);
        mlx5_free(priv->drop_queue.rxq);
        mlx5_free(hrxq->ind_table);
        mlx5_free(hrxq);
        priv->drop_queue.rxq = NULL;
        priv->drop_queue.hrxq = NULL;
}

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

        return mlx5_list_get_entry_num(priv->hrxqs);
}

/**
 * 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;
        }
}