[dpdk-dev] [PATCH v6 12/19] net/ngbe: add Rx queue setup and release
Andrew Rybchenko
andrew.rybchenko at oktetlabs.ru
Fri Jul 2 18:35:40 CEST 2021
On 6/17/21 1:59 PM, Jiawen Wu wrote:
> Setup device Rx queue and release Rx queue.
>
> Signed-off-by: Jiawen Wu <jiawenwu at trustnetic.com>
> ---
> drivers/net/ngbe/meson.build | 1 +
> drivers/net/ngbe/ngbe_ethdev.c | 37 +++-
> drivers/net/ngbe/ngbe_ethdev.h | 16 ++
> drivers/net/ngbe/ngbe_rxtx.c | 308 +++++++++++++++++++++++++++++++++
> drivers/net/ngbe/ngbe_rxtx.h | 96 ++++++++++
> 5 files changed, 457 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ngbe/ngbe_rxtx.c
> create mode 100644 drivers/net/ngbe/ngbe_rxtx.h
>
> diff --git a/drivers/net/ngbe/meson.build b/drivers/net/ngbe/meson.build
> index 81173fa7f0..9e75b82f1c 100644
> --- a/drivers/net/ngbe/meson.build
> +++ b/drivers/net/ngbe/meson.build
> @@ -12,6 +12,7 @@ objs = [base_objs]
>
> sources = files(
> 'ngbe_ethdev.c',
> + 'ngbe_rxtx.c',
> )
>
> includes += include_directories('base')
> diff --git a/drivers/net/ngbe/ngbe_ethdev.c b/drivers/net/ngbe/ngbe_ethdev.c
> index c952023e8b..e73606c5f3 100644
> --- a/drivers/net/ngbe/ngbe_ethdev.c
> +++ b/drivers/net/ngbe/ngbe_ethdev.c
> @@ -12,6 +12,7 @@
> #include "ngbe_logs.h"
> #include "base/ngbe.h"
> #include "ngbe_ethdev.h"
> +#include "ngbe_rxtx.h"
>
> static int ngbe_dev_close(struct rte_eth_dev *dev);
>
> @@ -37,6 +38,12 @@ static const struct rte_pci_id pci_id_ngbe_map[] = {
> { .vendor_id = 0, /* sentinel */ },
> };
>
> +static const struct rte_eth_desc_lim rx_desc_lim = {
> + .nb_max = NGBE_RING_DESC_MAX,
> + .nb_min = NGBE_RING_DESC_MIN,
> + .nb_align = NGBE_RXD_ALIGN,
> +};
> +
> static const struct eth_dev_ops ngbe_eth_dev_ops;
>
> static inline void
> @@ -241,12 +248,19 @@ static int
> ngbe_dev_configure(struct rte_eth_dev *dev)
> {
> struct ngbe_interrupt *intr = ngbe_dev_intr(dev);
> + struct ngbe_adapter *adapter = ngbe_dev_adapter(dev);
>
> PMD_INIT_FUNC_TRACE();
>
> /* set flag to update link status after init */
> intr->flags |= NGBE_FLAG_NEED_LINK_UPDATE;
>
> + /*
> + * Initialize to TRUE. If any of Rx queues doesn't meet the bulk
> + * allocation Rx preconditions we will reset it.
> + */
> + adapter->rx_bulk_alloc_allowed = true;
> +
> return 0;
> }
>
> @@ -266,11 +280,30 @@ ngbe_dev_close(struct rte_eth_dev *dev)
> static int
> ngbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
> {
> - RTE_SET_USED(dev);
> + struct ngbe_hw *hw = ngbe_dev_hw(dev);
> +
> + dev_info->max_rx_queues = (uint16_t)hw->mac.max_rx_queues;
> +
> + dev_info->default_rxconf = (struct rte_eth_rxconf) {
> + .rx_thresh = {
> + .pthresh = NGBE_DEFAULT_RX_PTHRESH,
> + .hthresh = NGBE_DEFAULT_RX_HTHRESH,
> + .wthresh = NGBE_DEFAULT_RX_WTHRESH,
> + },
> + .rx_free_thresh = NGBE_DEFAULT_RX_FREE_THRESH,
> + .rx_drop_en = 0,
> + .offloads = 0,
> + };
> +
> + dev_info->rx_desc_lim = rx_desc_lim;
>
> dev_info->speed_capa = ETH_LINK_SPEED_1G | ETH_LINK_SPEED_100M |
> ETH_LINK_SPEED_10M;
>
> + /* Driver-preferred Rx/Tx parameters */
> + dev_info->default_rxportconf.nb_queues = 1;
> + dev_info->default_rxportconf.ring_size = 256;
> +
> return 0;
> }
>
> @@ -570,6 +603,8 @@ static const struct eth_dev_ops ngbe_eth_dev_ops = {
> .dev_configure = ngbe_dev_configure,
> .dev_infos_get = ngbe_dev_info_get,
> .link_update = ngbe_dev_link_update,
> + .rx_queue_setup = ngbe_dev_rx_queue_setup,
> + .rx_queue_release = ngbe_dev_rx_queue_release,
> };
>
> RTE_PMD_REGISTER_PCI(net_ngbe, rte_ngbe_pmd);
> diff --git a/drivers/net/ngbe/ngbe_ethdev.h b/drivers/net/ngbe/ngbe_ethdev.h
> index b67508a3de..6580d288c8 100644
> --- a/drivers/net/ngbe/ngbe_ethdev.h
> +++ b/drivers/net/ngbe/ngbe_ethdev.h
> @@ -30,6 +30,7 @@ struct ngbe_interrupt {
> struct ngbe_adapter {
> struct ngbe_hw hw;
> struct ngbe_interrupt intr;
> + bool rx_bulk_alloc_allowed;
Shouldn't it be aligned as well as above fields?
> };
>
> static inline struct ngbe_adapter *
> @@ -58,6 +59,13 @@ ngbe_dev_intr(struct rte_eth_dev *dev)
> return intr;
> }
>
> +void ngbe_dev_rx_queue_release(void *rxq);
> +
> +int ngbe_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
> + uint16_t nb_rx_desc, unsigned int socket_id,
> + const struct rte_eth_rxconf *rx_conf,
> + struct rte_mempool *mb_pool);
> +
> int
> ngbe_dev_link_update_share(struct rte_eth_dev *dev,
> int wait_to_complete);
> @@ -66,4 +74,12 @@ ngbe_dev_link_update_share(struct rte_eth_dev *dev,
> #define NGBE_LINK_UP_CHECK_TIMEOUT 1000 /* ms */
> #define NGBE_VMDQ_NUM_UC_MAC 4096 /* Maximum nb. of UC MAC addr. */
>
> +/*
> + * Default values for Rx/Tx configuration
> + */
> +#define NGBE_DEFAULT_RX_FREE_THRESH 32
> +#define NGBE_DEFAULT_RX_PTHRESH 8
> +#define NGBE_DEFAULT_RX_HTHRESH 8
> +#define NGBE_DEFAULT_RX_WTHRESH 0
> +
> #endif /* _NGBE_ETHDEV_H_ */
> diff --git a/drivers/net/ngbe/ngbe_rxtx.c b/drivers/net/ngbe/ngbe_rxtx.c
> new file mode 100644
> index 0000000000..df0b64dc01
> --- /dev/null
> +++ b/drivers/net/ngbe/ngbe_rxtx.c
> @@ -0,0 +1,308 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2018-2020 Beijing WangXun Technology Co., Ltd.
> + * Copyright(c) 2010-2017 Intel Corporation
> + */
> +
> +#include <sys/queue.h>
> +
> +#include <stdint.h>
> +#include <rte_ethdev.h>
> +#include <ethdev_driver.h>
> +#include <rte_malloc.h>
> +
> +#include "ngbe_logs.h"
> +#include "base/ngbe.h"
> +#include "ngbe_ethdev.h"
> +#include "ngbe_rxtx.h"
> +
> +/**
> + * ngbe_free_sc_cluster - free the not-yet-completed scattered cluster
> + *
> + * The "next" pointer of the last segment of (not-yet-completed) RSC clusters
> + * in the sw_sc_ring is not set to NULL but rather points to the next
> + * mbuf of this RSC aggregation (that has not been completed yet and still
> + * resides on the HW ring). So, instead of calling for rte_pktmbuf_free() we
> + * will just free first "nb_segs" segments of the cluster explicitly by calling
> + * an rte_pktmbuf_free_seg().
> + *
> + * @m scattered cluster head
> + */
> +static void __rte_cold
> +ngbe_free_sc_cluster(struct rte_mbuf *m)
> +{
> + uint16_t i, nb_segs = m->nb_segs;
> + struct rte_mbuf *next_seg;
> +
> + for (i = 0; i < nb_segs; i++) {
> + next_seg = m->next;
> + rte_pktmbuf_free_seg(m);
> + m = next_seg;
> + }
> +}
> +
> +static void __rte_cold
> +ngbe_rx_queue_release_mbufs(struct ngbe_rx_queue *rxq)
> +{
> + unsigned int i;
> +
> + if (rxq->sw_ring != NULL) {
> + for (i = 0; i < rxq->nb_rx_desc; i++) {
> + if (rxq->sw_ring[i].mbuf != NULL) {
> + rte_pktmbuf_free_seg(rxq->sw_ring[i].mbuf);
> + rxq->sw_ring[i].mbuf = NULL;
> + }
> + }
> + if (rxq->rx_nb_avail) {
Compare vs 0 explicitly. However, it looks like that the
check is not required at all. Body may be done unconditionally.
> + for (i = 0; i < rxq->rx_nb_avail; ++i) {
> + struct rte_mbuf *mb;
> +
> + mb = rxq->rx_stage[rxq->rx_next_avail + i];
> + rte_pktmbuf_free_seg(mb);
> + }
> + rxq->rx_nb_avail = 0;
> + }
> + }
> +
> + if (rxq->sw_sc_ring != NULL)
> + for (i = 0; i < rxq->nb_rx_desc; i++)
> + if (rxq->sw_sc_ring[i].fbuf) {
Compare vs NULL
> + ngbe_free_sc_cluster(rxq->sw_sc_ring[i].fbuf);
> + rxq->sw_sc_ring[i].fbuf = NULL;
> + }
> +}
> +
> +static void __rte_cold
> +ngbe_rx_queue_release(struct ngbe_rx_queue *rxq)
> +{
> + if (rxq != NULL) {
> + ngbe_rx_queue_release_mbufs(rxq);
> + rte_free(rxq->sw_ring);
> + rte_free(rxq->sw_sc_ring);
> + rte_free(rxq);
> + }
> +}
> +
> +void __rte_cold
> +ngbe_dev_rx_queue_release(void *rxq)
> +{
> + ngbe_rx_queue_release(rxq);
> +}
> +
> +/*
> + * Check if Rx Burst Bulk Alloc function can be used.
> + * Return
> + * 0: the preconditions are satisfied and the bulk allocation function
> + * can be used.
> + * -EINVAL: the preconditions are NOT satisfied and the default Rx burst
> + * function must be used.
> + */
> +static inline int __rte_cold
> +check_rx_burst_bulk_alloc_preconditions(struct ngbe_rx_queue *rxq)
> +{
> + int ret = 0;
> +
> + /*
> + * Make sure the following pre-conditions are satisfied:
> + * rxq->rx_free_thresh >= RTE_PMD_NGBE_RX_MAX_BURST
> + * rxq->rx_free_thresh < rxq->nb_rx_desc
> + * (rxq->nb_rx_desc % rxq->rx_free_thresh) == 0
> + * Scattered packets are not supported. This should be checked
> + * outside of this function.
> + */
> + if (!(rxq->rx_free_thresh >= RTE_PMD_NGBE_RX_MAX_BURST)) {
Isn't is simpler to read and understand:
rxq->rx_free_thresh < RTE_PMD_NGBE_RX_MAX_BURST
> + PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
> + "rxq->rx_free_thresh=%d, "
> + "RTE_PMD_NGBE_RX_MAX_BURST=%d",
Do not split format string.
> + rxq->rx_free_thresh, RTE_PMD_NGBE_RX_MAX_BURST);
> + ret = -EINVAL;
> + } else if (!(rxq->rx_free_thresh < rxq->nb_rx_desc)) {
rxq->rx_free_thresh >= rxq->nb_rx_desc
is simpler to read
> + PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
> + "rxq->rx_free_thresh=%d, "
> + "rxq->nb_rx_desc=%d",
Do not split format string.
> + rxq->rx_free_thresh, rxq->nb_rx_desc);
> + ret = -EINVAL;
> + } else if (!((rxq->nb_rx_desc % rxq->rx_free_thresh) == 0)) {
(rxq->nb_rx_desc % rxq->rx_free_thresh) != 0
is easier to read
> + PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions: "
> + "rxq->nb_rx_desc=%d, "
> + "rxq->rx_free_thresh=%d",
> + rxq->nb_rx_desc, rxq->rx_free_thresh);
Do not split format string
> + ret = -EINVAL;
> + }
> +
> + return ret;
> +}
> +
> +/* Reset dynamic ngbe_rx_queue fields back to defaults */
> +static void __rte_cold
> +ngbe_reset_rx_queue(struct ngbe_adapter *adapter, struct ngbe_rx_queue *rxq)
> +{
> + static const struct ngbe_rx_desc zeroed_desc = {
> + {{0}, {0} }, {{0}, {0} } };
> + unsigned int i;
> + uint16_t len = rxq->nb_rx_desc;
> +
> + /*
> + * By default, the Rx queue setup function allocates enough memory for
> + * NGBE_RING_DESC_MAX. The Rx Burst bulk allocation function requires
> + * extra memory at the end of the descriptor ring to be zero'd out.
> + */
> + if (adapter->rx_bulk_alloc_allowed)
> + /* zero out extra memory */
> + len += RTE_PMD_NGBE_RX_MAX_BURST;
> +
> + /*
> + * Zero out HW ring memory. Zero out extra memory at the end of
> + * the H/W ring so look-ahead logic in Rx Burst bulk alloc function
> + * reads extra memory as zeros.
> + */
> + for (i = 0; i < len; i++)
> + rxq->rx_ring[i] = zeroed_desc;
> +
> + /*
> + * initialize extra software ring entries. Space for these extra
> + * entries is always allocated
> + */
> + memset(&rxq->fake_mbuf, 0x0, sizeof(rxq->fake_mbuf));
> + for (i = rxq->nb_rx_desc; i < len; ++i)
> + rxq->sw_ring[i].mbuf = &rxq->fake_mbuf;
> +
> + rxq->rx_nb_avail = 0;
> + rxq->rx_next_avail = 0;
> + rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_thresh - 1);
> + rxq->rx_tail = 0;
> + rxq->nb_rx_hold = 0;
> + rxq->pkt_first_seg = NULL;
> + rxq->pkt_last_seg = NULL;
> +}
> +
> +int __rte_cold
> +ngbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
> + uint16_t queue_idx,
> + uint16_t nb_desc,
> + unsigned int socket_id,
> + const struct rte_eth_rxconf *rx_conf,
> + struct rte_mempool *mp)
> +{
> + const struct rte_memzone *rz;
> + struct ngbe_rx_queue *rxq;
> + struct ngbe_hw *hw;
> + uint16_t len;
> + struct ngbe_adapter *adapter = ngbe_dev_adapter(dev);
> +
> + PMD_INIT_FUNC_TRACE();
> + hw = ngbe_dev_hw(dev);
> +
> + /*
> + * Validate number of receive descriptors.
> + * It must not exceed hardware maximum, and must be multiple
> + * of NGBE_ALIGN.
> + */
> + if (nb_desc % NGBE_RXD_ALIGN != 0 ||
> + nb_desc > NGBE_RING_DESC_MAX ||
> + nb_desc < NGBE_RING_DESC_MIN) {
> + return -EINVAL;
> + }
rte_eth_rx_queue_setup cares about it
> +
> + /* Free memory prior to re-allocation if needed... */
> + if (dev->data->rx_queues[queue_idx] != NULL) {
> + ngbe_rx_queue_release(dev->data->rx_queues[queue_idx]);
> + dev->data->rx_queues[queue_idx] = NULL;
> + }
> +
> + /* First allocate the Rx queue data structure */
> + rxq = rte_zmalloc_socket("ethdev RX queue",
> + sizeof(struct ngbe_rx_queue),
> + RTE_CACHE_LINE_SIZE, socket_id);
> + if (rxq == NULL)
> + return -ENOMEM;
> + rxq->mb_pool = mp;
> + rxq->nb_rx_desc = nb_desc;
> + rxq->rx_free_thresh = rx_conf->rx_free_thresh;
> + rxq->queue_id = queue_idx;
> + rxq->reg_idx = queue_idx;
> + rxq->port_id = dev->data->port_id;
> + rxq->drop_en = rx_conf->rx_drop_en;
> + rxq->rx_deferred_start = rx_conf->rx_deferred_start;
> +
> + /*
> + * Allocate Rx ring hardware descriptors. A memzone large enough to
> + * handle the maximum ring size is allocated in order to allow for
> + * resizing in later calls to the queue setup function.
> + */
> + rz = rte_eth_dma_zone_reserve(dev, "rx_ring", queue_idx,
> + RX_RING_SZ, NGBE_ALIGN, socket_id);
> + if (rz == NULL) {
> + ngbe_rx_queue_release(rxq);
> + return -ENOMEM;
> + }
> +
> + /*
> + * Zero init all the descriptors in the ring.
> + */
> + memset(rz->addr, 0, RX_RING_SZ);
> +
> + rxq->rdt_reg_addr = NGBE_REG_ADDR(hw, NGBE_RXWP(rxq->reg_idx));
> + rxq->rdh_reg_addr = NGBE_REG_ADDR(hw, NGBE_RXRP(rxq->reg_idx));
> +
> + rxq->rx_ring_phys_addr = TMZ_PADDR(rz);
> + rxq->rx_ring = (struct ngbe_rx_desc *)TMZ_VADDR(rz);
> +
> + /*
> + * Certain constraints must be met in order to use the bulk buffer
> + * allocation Rx burst function. If any of Rx queues doesn't meet them
> + * the feature should be disabled for the whole port.
> + */
> + if (check_rx_burst_bulk_alloc_preconditions(rxq)) {
> + PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Rx Bulk Alloc "
> + "preconditions - canceling the feature for "
> + "the whole port[%d]",
Do not split format string.
> + rxq->queue_id, rxq->port_id);
> + adapter->rx_bulk_alloc_allowed = false;
> + }
> +
> + /*
> + * Allocate software ring. Allow for space at the end of the
> + * S/W ring to make sure look-ahead logic in bulk alloc Rx burst
> + * function does not access an invalid memory region.
> + */
> + len = nb_desc;
> + if (adapter->rx_bulk_alloc_allowed)
> + len += RTE_PMD_NGBE_RX_MAX_BURST;
> +
> + rxq->sw_ring = rte_zmalloc_socket("rxq->sw_ring",
> + sizeof(struct ngbe_rx_entry) * len,
> + RTE_CACHE_LINE_SIZE, socket_id);
> + if (rxq->sw_ring == NULL) {
> + ngbe_rx_queue_release(rxq);
> + return -ENOMEM;
> + }
> +
> + /*
> + * Always allocate even if it's not going to be needed in order to
> + * simplify the code.
> + *
> + * This ring is used in Scattered Rx cases and Scattered Rx may
> + * be requested in ngbe_dev_rx_init(), which is called later from
> + * dev_start() flow.
> + */
> + rxq->sw_sc_ring =
> + rte_zmalloc_socket("rxq->sw_sc_ring",
> + sizeof(struct ngbe_scattered_rx_entry) * len,
> + RTE_CACHE_LINE_SIZE, socket_id);
> + if (rxq->sw_sc_ring == NULL) {
> + ngbe_rx_queue_release(rxq);
> + return -ENOMEM;
> + }
> +
> + PMD_INIT_LOG(DEBUG, "sw_ring=%p sw_sc_ring=%p hw_ring=%p "
> + "dma_addr=0x%" PRIx64,
Do not split format string.
> + rxq->sw_ring, rxq->sw_sc_ring, rxq->rx_ring,
> + rxq->rx_ring_phys_addr);
> +
> + dev->data->rx_queues[queue_idx] = rxq;
> +
> + ngbe_reset_rx_queue(adapter, rxq);
> +
> + return 0;
> +}
> +
> diff --git a/drivers/net/ngbe/ngbe_rxtx.h b/drivers/net/ngbe/ngbe_rxtx.h
> new file mode 100644
> index 0000000000..92b9a9fd1b
> --- /dev/null
> +++ b/drivers/net/ngbe/ngbe_rxtx.h
> @@ -0,0 +1,96 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2018-2020 Beijing WangXun Technology Co., Ltd.
> + * Copyright(c) 2010-2017 Intel Corporation
> + */
> +
> +#ifndef _NGBE_RXTX_H_
> +#define _NGBE_RXTX_H_
> +
> +/*****************************************************************************
> + * Receive Descriptor
> + *****************************************************************************/
> +struct ngbe_rx_desc {
> + struct {
> + union {
> + rte_le32_t dw0;
> + struct {
> + rte_le16_t pkt;
> + rte_le16_t hdr;
> + } lo;
> + };
> + union {
> + rte_le32_t dw1;
> + struct {
> + rte_le16_t ipid;
> + rte_le16_t csum;
> + } hi;
> + };
> + } qw0; /* also as r.pkt_addr */
> + struct {
> + union {
> + rte_le32_t dw2;
> + struct {
> + rte_le32_t status;
> + } lo;
> + };
> + union {
> + rte_le32_t dw3;
> + struct {
> + rte_le16_t len;
> + rte_le16_t tag;
> + } hi;
> + };
> + } qw1; /* also as r.hdr_addr */
> +};
> +
> +#define RTE_PMD_NGBE_RX_MAX_BURST 32
> +
> +#define RX_RING_SZ ((NGBE_RING_DESC_MAX + RTE_PMD_NGBE_RX_MAX_BURST) * \
> + sizeof(struct ngbe_rx_desc))
> +
> +
> +/**
> + * Structure associated with each descriptor of the Rx ring of a Rx queue.
> + */
> +struct ngbe_rx_entry {
> + struct rte_mbuf *mbuf; /**< mbuf associated with Rx descriptor. */
> +};
> +
> +struct ngbe_scattered_rx_entry {
> + struct rte_mbuf *fbuf; /**< First segment of the fragmented packet. */
> +};
> +
> +/**
> + * Structure associated with each Rx queue.
> + */
> +struct ngbe_rx_queue {
> + struct rte_mempool *mb_pool; /**< mbuf pool to populate Rx ring. */
> + volatile struct ngbe_rx_desc *rx_ring; /**< Rx ring virtual address. */
> + uint64_t rx_ring_phys_addr; /**< Rx ring DMA address. */
> + volatile uint32_t *rdt_reg_addr; /**< RDT register address. */
> + volatile uint32_t *rdh_reg_addr; /**< RDH register address. */
> + struct ngbe_rx_entry *sw_ring; /**< address of Rx software ring. */
> + /**< address of scattered Rx software ring. */
> + struct ngbe_scattered_rx_entry *sw_sc_ring;
> + struct rte_mbuf *pkt_first_seg; /**< First segment of current packet. */
> + struct rte_mbuf *pkt_last_seg; /**< Last segment of current packet. */
> + uint16_t nb_rx_desc; /**< number of Rx descriptors. */
> + uint16_t rx_tail; /**< current value of RDT register. */
> + uint16_t nb_rx_hold; /**< number of held free Rx desc. */
> + uint16_t rx_nb_avail; /**< nr of staged pkts ready to ret to app */
> + uint16_t rx_next_avail; /**< idx of next staged pkt to ret to app */
> + uint16_t rx_free_trigger; /**< triggers rx buffer allocation */
> + uint16_t rx_free_thresh; /**< max free Rx desc to hold. */
> + uint16_t queue_id; /**< RX queue index. */
> + uint16_t reg_idx; /**< RX queue register index. */
> + /**< Packet type mask for different NICs. */
> + uint16_t port_id; /**< Device port identifier. */
> + uint8_t drop_en; /**< If not 0, set SRRCTL.Drop_En. */
> + uint8_t rx_deferred_start; /**< not in global dev start. */
> + /** need to alloc dummy mbuf, for wraparound when scanning hw ring */
> + struct rte_mbuf fake_mbuf;
> + /** hold packets to return to application */
> + struct rte_mbuf *rx_stage[RTE_PMD_NGBE_RX_MAX_BURST * 2];
> +};
> +
> +#endif /* _NGBE_RXTX_H_ */
>
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