text: /* SPDX-License-Identifier: BSD-3-Clause
   * Copyright(c) 2019 Intel Corporation.
   */
  #include <unistd.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  #include <poll.h>
  #include <netinet/in.h>
  #include <net/if.h>
  #include <sys/socket.h>
  #include <sys/ioctl.h>
  #include <linux/if_ether.h>
  #include <linux/if_xdp.h>
  #include <linux/if_link.h>
  #include <linux/ethtool.h>
  #include <linux/sockios.h>
  #include "af_xdp_deps.h"
  #include <bpf/xsk.h>
  
  #include <rte_ethdev.h>
  #include <rte_ethdev_driver.h>
  #include <rte_ethdev_vdev.h>
  #include <rte_kvargs.h>
  #include <rte_bus_vdev.h>
  #include <rte_string_fns.h>
  #include <rte_branch_prediction.h>
  #include <rte_common.h>
  #include <rte_dev.h>
  #include <rte_eal.h>
  #include <rte_ether.h>
  #include <rte_lcore.h>
  #include <rte_log.h>
  #include <rte_memory.h>
  #include <rte_memzone.h>
  #include <rte_mempool.h>
  #include <rte_mbuf.h>
  #include <rte_malloc.h>
  #include <rte_ring.h>
  
  #ifndef SOL_XDP
  #define SOL_XDP 283
  #endif
  
  #ifndef AF_XDP
  #define AF_XDP 44
  #endif
  
  #ifndef PF_XDP
  #define PF_XDP AF_XDP
  #endif
  
  static int af_xdp_logtype;
  
  #define AF_XDP_LOG(level, fmt, args...)			\
  	rte_log(RTE_LOG_ ## level, af_xdp_logtype,	\
  		"%s(): " fmt, __func__, ##args)
  
  #define ETH_AF_XDP_FRAME_SIZE		2048
  #define ETH_AF_XDP_NUM_BUFFERS		4096
  #define ETH_AF_XDP_DFLT_NUM_DESCS	XSK_RING_CONS__DEFAULT_NUM_DESCS
  #define ETH_AF_XDP_DFLT_START_QUEUE_IDX	0
  #define ETH_AF_XDP_DFLT_QUEUE_COUNT	1
  
  #define ETH_AF_XDP_RX_BATCH_SIZE	32
  #define ETH_AF_XDP_TX_BATCH_SIZE	32
  
  
  struct xsk_umem_info {
  	struct xsk_ring_prod fq;
  	struct xsk_ring_cons cq;
  	struct xsk_umem *umem;
  	struct rte_ring *buf_ring;
  	const struct rte_memzone *mz;
  	struct rte_mempool *mb_pool;
  	void *buffer;
  };
  
  struct rx_stats {
  	uint64_t rx_pkts;
  	uint64_t rx_bytes;
  	uint64_t rx_dropped;
  };
  
  struct pkt_rx_queue {
  	struct xsk_ring_cons rx;
  	struct xsk_umem_info *umem;
  	struct xsk_socket *xsk;
  	struct rte_mempool *mb_pool;
  
  	struct rx_stats stats;
  
  	struct pkt_tx_queue *pair;
  	struct pollfd fds[1];
  	int xsk_queue_idx;
  };
  
  struct tx_stats {
  	uint64_t tx_pkts;
  	uint64_t tx_bytes;
  	uint64_t tx_dropped;
  };
  
  struct pkt_tx_queue {
  	struct xsk_ring_prod tx;
  	struct xsk_umem_info *umem;
  
  	struct tx_stats stats;
  
  	struct pkt_rx_queue *pair;
  	int xsk_queue_idx;
  };
  
  struct pmd_internals {
  	int if_index;
  	char if_name[IFNAMSIZ];
  	int start_queue_idx;
  	int queue_cnt;
  	int max_queue_cnt;
  	int combined_queue_cnt;
  
  	struct rte_ether_addr eth_addr;
  
  	struct pkt_rx_queue *rx_queues;
  	struct pkt_tx_queue *tx_queues;
  };
  
  #define ETH_AF_XDP_IFACE_ARG			"iface"
  #define ETH_AF_XDP_START_QUEUE_ARG		"start_queue"
  #define ETH_AF_XDP_QUEUE_COUNT_ARG		"queue_count"
  
  static const char * const valid_arguments[] = {
  	ETH_AF_XDP_IFACE_ARG,
  	ETH_AF_XDP_START_QUEUE_ARG,
  	ETH_AF_XDP_QUEUE_COUNT_ARG,
  	NULL
  };
  
  static const struct rte_eth_link pmd_link = {
  	.link_speed = ETH_SPEED_NUM_10G,
  	.link_duplex = ETH_LINK_FULL_DUPLEX,
  	.link_status = ETH_LINK_DOWN,
  	.link_autoneg = ETH_LINK_AUTONEG
  };
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  static inline int
  reserve_fill_queue_zc(struct xsk_umem_info *umem, uint16_t reserve_size,
  		      struct rte_mbuf **bufs)
  {
  	struct xsk_ring_prod *fq = &umem->fq;
  	uint32_t idx;
  	uint16_t i;
  
  	if (unlikely(!xsk_ring_prod__reserve(fq, reserve_size, &idx))) {
  		for (i = 0; i < reserve_size; i++)
  			rte_pktmbuf_free(bufs[i]);
  		AF_XDP_LOG(DEBUG, "Failed to reserve enough fq descs.\n");
  		return -1;
  	}
  
  	for (i = 0; i < reserve_size; i++) {
  		__u64 *fq_addr;
  		uint64_t addr;
  
  		fq_addr = xsk_ring_prod__fill_addr(fq, idx++);
  		addr = (uint64_t)bufs[i] - (uint64_t)umem->buffer -
  				umem->mb_pool->header_size;
  		*fq_addr = addr;
  	}
  
  	xsk_ring_prod__submit(fq, reserve_size);
  
  	return 0;
  }
  #else
  static inline int
  reserve_fill_queue_cp(struct xsk_umem_info *umem, uint16_t reserve_size,
  		      struct rte_mbuf **bufs __rte_unused)
  {
  	struct xsk_ring_prod *fq = &umem->fq;
  	void *addrs[reserve_size];
  	uint32_t idx;
  	uint16_t i;
  
  	if (rte_ring_dequeue_bulk(umem->buf_ring, addrs, reserve_size, NULL)
  		    != reserve_size) {
  		AF_XDP_LOG(DEBUG, "Failed to get enough buffers for fq.\n");
  		return -1;
  	}
  
  	if (unlikely(!xsk_ring_prod__reserve(fq, reserve_size, &idx))) {
  		AF_XDP_LOG(DEBUG, "Failed to reserve enough fq descs.\n");
  		rte_ring_enqueue_bulk(umem->buf_ring, addrs,
  				reserve_size, NULL);
  		return -1;
  	}
  
  	for (i = 0; i < reserve_size; i++) {
  		__u64 *fq_addr;
  
  		fq_addr = xsk_ring_prod__fill_addr(fq, idx++);
  		*fq_addr = (uint64_t)addrs[i];
  	}
  
  	xsk_ring_prod__submit(fq, reserve_size);
  
  	return 0;
  }
  #endif
  
  static inline int
  reserve_fill_queue(struct xsk_umem_info *umem, uint16_t reserve_size,
  		   struct rte_mbuf **bufs)
  {
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	return reserve_fill_queue_zc(umem, reserve_size, bufs);
  #else
  	return reserve_fill_queue_cp(umem, reserve_size, bufs);
  #endif
  }
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  static uint16_t
  af_xdp_rx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  	struct pkt_rx_queue *rxq = queue;
  	struct xsk_ring_cons *rx = &rxq->rx;
  	struct xsk_umem_info *umem = rxq->umem;
  	uint32_t idx_rx = 0;
  	unsigned long rx_bytes = 0;
  	int rcvd, i;
  	struct rte_mbuf *fq_bufs[ETH_AF_XDP_RX_BATCH_SIZE];
  
  	/* allocate bufs for fill queue replenishment after rx */
  	if (rte_pktmbuf_alloc_bulk(umem->mb_pool, fq_bufs, nb_pkts)) {
  		AF_XDP_LOG(DEBUG,
  			"Failed to get enough buffers for fq.\n");
  		return -1;
  	}
  
  	rcvd = xsk_ring_cons__peek(rx, nb_pkts, &idx_rx);
  
  	if (rcvd == 0) {
  #if defined(XDP_USE_NEED_WAKEUP)
  		if (xsk_ring_prod__needs_wakeup(&umem->fq))
  			(void)poll(rxq->fds, 1, 1000);
  #endif
  
  		goto out;
  	}
  
  	for (i = 0; i < rcvd; i++) {
  		const struct xdp_desc *desc;
  		uint64_t addr;
  		uint32_t len;
  		uint64_t offset;
  
  		desc = xsk_ring_cons__rx_desc(rx, idx_rx++);
  		addr = desc->addr;
  		len = desc->len;
  
  		offset = xsk_umem__extract_offset(addr);
  		addr = xsk_umem__extract_addr(addr);
  
  		bufs[i] = (struct rte_mbuf *)
  				xsk_umem__get_data(umem->buffer, addr +
  					umem->mb_pool->header_size);
  		bufs[i]->data_off = offset - sizeof(struct rte_mbuf) -
  			rte_pktmbuf_priv_size(umem->mb_pool) -
  			umem->mb_pool->header_size;
  
  		rte_pktmbuf_pkt_len(bufs[i]) = len;
  		rte_pktmbuf_data_len(bufs[i]) = len;
  		rx_bytes += len;
  	}
  
  	xsk_ring_cons__release(rx, rcvd);
  
  	(void)reserve_fill_queue(umem, rcvd, fq_bufs);
  
  	/* statistics */
  	rxq->stats.rx_pkts += rcvd;
  	rxq->stats.rx_bytes += rx_bytes;
  
  out:
  	if (rcvd != nb_pkts)
  		rte_mempool_put_bulk(umem->mb_pool, (void **)&fq_bufs[rcvd],
  				     nb_pkts - rcvd);
  
  	return rcvd;
  }
  #else
  static uint16_t
  af_xdp_rx_cp(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  	struct pkt_rx_queue *rxq = queue;
  	struct xsk_ring_cons *rx = &rxq->rx;
  	struct xsk_umem_info *umem = rxq->umem;
  	struct xsk_ring_prod *fq = &umem->fq;
  	uint32_t idx_rx = 0;
  	unsigned long rx_bytes = 0;
  	int rcvd, i;
  	uint32_t free_thresh = fq->size >> 1;
  	struct rte_mbuf *mbufs[ETH_AF_XDP_RX_BATCH_SIZE];
  
  	if (unlikely(rte_pktmbuf_alloc_bulk(rxq->mb_pool, mbufs, nb_pkts) != 0))
  		return 0;
  
  	rcvd = xsk_ring_cons__peek(rx, nb_pkts, &idx_rx);
  	if (rcvd == 0) {
  #if defined(XDP_USE_NEED_WAKEUP)
  		if (xsk_ring_prod__needs_wakeup(fq))
  			(void)poll(rxq->fds, 1, 1000);
  #endif
  
  		goto out;
  	}
  
  	if (xsk_prod_nb_free(fq, free_thresh) >= free_thresh)
  		(void)reserve_fill_queue(umem, ETH_AF_XDP_RX_BATCH_SIZE, NULL);
  
  	for (i = 0; i < rcvd; i++) {
  		const struct xdp_desc *desc;
  		uint64_t addr;
  		uint32_t len;
  		void *pkt;
  
  		desc = xsk_ring_cons__rx_desc(rx, idx_rx++);
  		addr = desc->addr;
  		len = desc->len;
  		pkt = xsk_umem__get_data(rxq->umem->mz->addr, addr);
  
  		rte_memcpy(rte_pktmbuf_mtod(mbufs[i], void *), pkt, len);
  		rte_ring_enqueue(umem->buf_ring, (void *)addr);
  		rte_pktmbuf_pkt_len(mbufs[i]) = len;
  		rte_pktmbuf_data_len(mbufs[i]) = len;
  		rx_bytes += len;
  		bufs[i] = mbufs[i];
  	}
  
  	xsk_ring_cons__release(rx, rcvd);
  
  	/* statistics */
  	rxq->stats.rx_pkts += rcvd;
  	rxq->stats.rx_bytes += rx_bytes;
  
  out:
  	if (rcvd != nb_pkts)
  		rte_mempool_put_bulk(rxq->mb_pool, (void **)&mbufs[rcvd],
  				     nb_pkts - rcvd);
  
  	return rcvd;
  }
  #endif
  
  static uint16_t
  eth_af_xdp_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  	nb_pkts = RTE_MIN(nb_pkts, ETH_AF_XDP_RX_BATCH_SIZE);
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	return af_xdp_rx_zc(queue, bufs, nb_pkts);
  #else
  	return af_xdp_rx_cp(queue, bufs, nb_pkts);
  #endif
  }
  
  static void
  pull_umem_cq(struct xsk_umem_info *umem, int size)
  {
  	struct xsk_ring_cons *cq = &umem->cq;
  	size_t i, n;
  	uint32_t idx_cq = 0;
  
  	n = xsk_ring_cons__peek(cq, size, &idx_cq);
  
  	for (i = 0; i < n; i++) {
  		uint64_t addr;
  		addr = *xsk_ring_cons__comp_addr(cq, idx_cq++);
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  		addr = xsk_umem__extract_addr(addr);
  		rte_pktmbuf_free((struct rte_mbuf *)
  					xsk_umem__get_data(umem->buffer,
  					addr + umem->mb_pool->header_size));
  #else
  		rte_ring_enqueue(umem->buf_ring, (void *)addr);
  #endif
  	}
  
  	xsk_ring_cons__release(cq, n);
  }
  
  static void
  kick_tx(struct pkt_tx_queue *txq)
  {
  	struct xsk_umem_info *umem = txq->umem;
  
  #if defined(XDP_USE_NEED_WAKEUP)
  	if (xsk_ring_prod__needs_wakeup(&txq->tx))
  #endif
  		while (send(xsk_socket__fd(txq->pair->xsk), NULL,
  			    0, MSG_DONTWAIT) < 0) {
  			/* some thing unexpected */
  			if (errno != EBUSY && errno != EAGAIN && errno != EINTR)
  				break;
  
  			/* pull from completion queue to leave more space */
  			if (errno == EAGAIN)
  				pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
  		}
  #ifndef XDP_UMEM_UNALIGNED_CHUNK_FLAG
  	pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
  #endif
  }
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  static uint16_t
  af_xdp_tx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  	struct pkt_tx_queue *txq = queue;
  	struct xsk_umem_info *umem = txq->umem;
  	struct rte_mbuf *mbuf;
  	unsigned long tx_bytes = 0;
  	int i;
  	uint32_t idx_tx;
  	uint16_t count = 0;
  	struct xdp_desc *desc;
  	uint64_t addr, offset;
  
  	pull_umem_cq(umem, nb_pkts);
  
  	for (i = 0; i < nb_pkts; i++) {
  		mbuf = bufs[i];
  
  		if (mbuf->pool == umem->mb_pool) {
  			if (!xsk_ring_prod__reserve(&txq->tx, 1, &idx_tx)) {
  				kick_tx(txq);
  				goto out;
  			}
  			desc = xsk_ring_prod__tx_desc(&txq->tx, idx_tx);
  			desc->len = mbuf->pkt_len;
  			addr = (uint64_t)mbuf - (uint64_t)umem->buffer -
  					umem->mb_pool->header_size;
  			offset = rte_pktmbuf_mtod(mbuf, uint64_t) -
  					(uint64_t)mbuf +
  					umem->mb_pool->header_size;
  			offset = offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT;
  			desc->addr = addr | offset;
  			count++;
  		} else {
  			struct rte_mbuf *local_mbuf =
  					rte_pktmbuf_alloc(umem->mb_pool);
  			void *pkt;
  
  			if (local_mbuf == NULL)
  				goto out;
  
  			if (!xsk_ring_prod__reserve(&txq->tx, 1, &idx_tx)) {
  				rte_pktmbuf_free(local_mbuf);
  				kick_tx(txq);
  				goto out;
  			}
  
  			desc = xsk_ring_prod__tx_desc(&txq->tx, idx_tx);
  			desc->len = mbuf->pkt_len;
  
  			addr = (uint64_t)local_mbuf - (uint64_t)umem->buffer -
  					umem->mb_pool->header_size;
  			offset = rte_pktmbuf_mtod(local_mbuf, uint64_t) -
  					(uint64_t)local_mbuf +
  					umem->mb_pool->header_size;
  			pkt = xsk_umem__get_data(umem->buffer, addr + offset);
  			offset = offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT;
  			desc->addr = addr | offset;
  			rte_memcpy(pkt, rte_pktmbuf_mtod(mbuf, void *),
  					desc->len);
  			rte_pktmbuf_free(mbuf);
  			count++;
  		}
  
  		tx_bytes += mbuf->pkt_len;
  	}
  
  	kick_tx(txq);
  
  out:
  	xsk_ring_prod__submit(&txq->tx, count);
  
  	txq->stats.tx_pkts += count;
  	txq->stats.tx_bytes += tx_bytes;
  	txq->stats.tx_dropped += nb_pkts - count;
  
  	return count;
  }
  #else
  static uint16_t
  af_xdp_tx_cp(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  	struct pkt_tx_queue *txq = queue;
  	struct xsk_umem_info *umem = txq->umem;
  	struct rte_mbuf *mbuf;
  	void *addrs[ETH_AF_XDP_TX_BATCH_SIZE];
  	unsigned long tx_bytes = 0;
  	int i;
  	uint32_t idx_tx;
  
  	nb_pkts = RTE_MIN(nb_pkts, ETH_AF_XDP_TX_BATCH_SIZE);
  
  	pull_umem_cq(umem, nb_pkts);
  
  	nb_pkts = rte_ring_dequeue_bulk(umem->buf_ring, addrs,
  					nb_pkts, NULL);
  	if (nb_pkts == 0)
  		return 0;
  
  	if (xsk_ring_prod__reserve(&txq->tx, nb_pkts, &idx_tx) != nb_pkts) {
  		kick_tx(txq);
  		rte_ring_enqueue_bulk(umem->buf_ring, addrs, nb_pkts, NULL);
  		return 0;
  	}
  
  	for (i = 0; i < nb_pkts; i++) {
  		struct xdp_desc *desc;
  		void *pkt;
  
  		desc = xsk_ring_prod__tx_desc(&txq->tx, idx_tx + i);
  		mbuf = bufs[i];
  		desc->len = mbuf->pkt_len;
  
  		desc->addr = (uint64_t)addrs[i];
  		pkt = xsk_umem__get_data(umem->mz->addr,
  					 desc->addr);
  		rte_memcpy(pkt, rte_pktmbuf_mtod(mbuf, void *), desc->len);
  		tx_bytes += mbuf->pkt_len;
  		rte_pktmbuf_free(mbuf);
  	}
  
  	xsk_ring_prod__submit(&txq->tx, nb_pkts);
  
  	kick_tx(txq);
  
  	txq->stats.tx_pkts += nb_pkts;
  	txq->stats.tx_bytes += tx_bytes;
  
  	return nb_pkts;
  }
  #endif
  
  static uint16_t
  eth_af_xdp_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
  {
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	return af_xdp_tx_zc(queue, bufs, nb_pkts);
  #else
  	return af_xdp_tx_cp(queue, bufs, nb_pkts);
  #endif
  }
  
  static int
  eth_dev_start(struct rte_eth_dev *dev)
  {
  	dev->data->dev_link.link_status = ETH_LINK_UP;
  
  	return 0;
  }
  
  /* This function gets called when the current port gets stopped. */
  static void
  eth_dev_stop(struct rte_eth_dev *dev)
  {
  	dev->data->dev_link.link_status = ETH_LINK_DOWN;
  }
  
  static int
  eth_dev_configure(struct rte_eth_dev *dev)
  {
  	/* rx/tx must be paired */
  	if (dev->data->nb_rx_queues != dev->data->nb_tx_queues)
  		return -EINVAL;
  
  	return 0;
  }
  
  static int
  eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  
  	dev_info->if_index = internals->if_index;
  	dev_info->max_mac_addrs = 1;
  	dev_info->max_rx_pktlen = ETH_FRAME_LEN;
  	dev_info->max_rx_queues = internals->queue_cnt;
  	dev_info->max_tx_queues = internals->queue_cnt;
  
  	dev_info->min_mtu = RTE_ETHER_MIN_MTU;
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	dev_info->max_mtu = getpagesize() -
  				sizeof(struct rte_mempool_objhdr) -
  				sizeof(struct rte_mbuf) -
  				RTE_PKTMBUF_HEADROOM - XDP_PACKET_HEADROOM;
  #else
  	dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - XDP_PACKET_HEADROOM;
  #endif
  
  	dev_info->default_rxportconf.nb_queues = 1;
  	dev_info->default_txportconf.nb_queues = 1;
  	dev_info->default_rxportconf.ring_size = ETH_AF_XDP_DFLT_NUM_DESCS;
  	dev_info->default_txportconf.ring_size = ETH_AF_XDP_DFLT_NUM_DESCS;
  
  	return 0;
  }
  
  static int
  eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	struct xdp_statistics xdp_stats;
  	struct pkt_rx_queue *rxq;
  	struct pkt_tx_queue *txq;
  	socklen_t optlen;
  	int i, ret;
  
  	for (i = 0; i < dev->data->nb_rx_queues; i++) {
  		optlen = sizeof(struct xdp_statistics);
  		rxq = &internals->rx_queues[i];
  		txq = rxq->pair;
  		stats->q_ipackets[i] = rxq->stats.rx_pkts;
  		stats->q_ibytes[i] = rxq->stats.rx_bytes;
  
  		stats->q_opackets[i] = txq->stats.tx_pkts;
  		stats->q_obytes[i] = txq->stats.tx_bytes;
  
  		stats->ipackets += stats->q_ipackets[i];
  		stats->ibytes += stats->q_ibytes[i];
  		stats->imissed += rxq->stats.rx_dropped;
  		stats->oerrors += txq->stats.tx_dropped;
  		ret = getsockopt(xsk_socket__fd(rxq->xsk), SOL_XDP,
  				XDP_STATISTICS, &xdp_stats, &optlen);
  		if (ret != 0) {
  			AF_XDP_LOG(ERR, "getsockopt() failed for XDP_STATISTICS.\n");
  			return -1;
  		}
  		stats->imissed += xdp_stats.rx_dropped;
  
  		stats->opackets += stats->q_opackets[i];
  		stats->obytes += stats->q_obytes[i];
  	}
  
  	return 0;
  }
  
  static int
  eth_stats_reset(struct rte_eth_dev *dev)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	int i;
  
  	for (i = 0; i < internals->queue_cnt; i++) {
  		memset(&internals->rx_queues[i].stats, 0,
  					sizeof(struct rx_stats));
  		memset(&internals->tx_queues[i].stats, 0,
  					sizeof(struct tx_stats));
  	}
  
  	return 0;
  }
  
  static void
  remove_xdp_program(struct pmd_internals *internals)
  {
  	uint32_t curr_prog_id = 0;
  
  	if (bpf_get_link_xdp_id(internals->if_index, &curr_prog_id,
  				XDP_FLAGS_UPDATE_IF_NOEXIST)) {
  		AF_XDP_LOG(ERR, "bpf_get_link_xdp_id failed\n");
  		return;
  	}
  	bpf_set_link_xdp_fd(internals->if_index, -1,
  			XDP_FLAGS_UPDATE_IF_NOEXIST);
  }
  
  static void
  xdp_umem_destroy(struct xsk_umem_info *umem)
  {
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	rte_mempool_free(umem->mb_pool);
  	umem->mb_pool = NULL;
  #else
  	rte_memzone_free(umem->mz);
  	umem->mz = NULL;
  
  	rte_ring_free(umem->buf_ring);
  	umem->buf_ring = NULL;
  #endif
  
  	rte_free(umem);
  	umem = NULL;
  }
  
  static void
  eth_dev_close(struct rte_eth_dev *dev)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	struct pkt_rx_queue *rxq;
  	int i;
  
  	AF_XDP_LOG(INFO, "Closing AF_XDP ethdev on numa socket %u\n",
  		rte_socket_id());
  
  	for (i = 0; i < internals->queue_cnt; i++) {
  		rxq = &internals->rx_queues[i];
  		if (rxq->umem == NULL)
  			break;
  		xsk_socket__delete(rxq->xsk);
  		(void)xsk_umem__delete(rxq->umem->umem);
  		xdp_umem_destroy(rxq->umem);
  
  		/* free pkt_tx_queue */
  		rte_free(rxq->pair);
  		rte_free(rxq);
  	}
  
  	/*
  	 * MAC is not allocated dynamically, setting it to NULL would prevent
  	 * from releasing it in rte_eth_dev_release_port.
  	 */
  	dev->data->mac_addrs = NULL;
  
  	remove_xdp_program(internals);
  }
  
  static void
  eth_queue_release(void *q __rte_unused)
  {
  }
  
  static int
  eth_link_update(struct rte_eth_dev *dev __rte_unused,
  		int wait_to_complete __rte_unused)
  {
  	return 0;
  }
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  static inline uint64_t get_base_addr(struct rte_mempool *mp)
  {
  	struct rte_mempool_memhdr *memhdr;
  
  	memhdr = STAILQ_FIRST(&mp->mem_list);
  	return (uint64_t)memhdr->addr & ~(getpagesize() - 1);
  }
  
  static struct
  xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals __rte_unused,
  				  struct pkt_rx_queue *rxq)
  {
  	struct xsk_umem_info *umem;
  	int ret;
  	struct xsk_umem_config usr_config = {
  		.fill_size = ETH_AF_XDP_DFLT_NUM_DESCS,
  		.comp_size = ETH_AF_XDP_DFLT_NUM_DESCS,
  		.flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG};
  	void *base_addr = NULL;
  	struct rte_mempool *mb_pool = rxq->mb_pool;
  
  	usr_config.frame_size = rte_mempool_calc_obj_size(mb_pool->elt_size,
  								mb_pool->flags,
  								NULL);
  	usr_config.frame_headroom = mb_pool->header_size +
  					sizeof(struct rte_mbuf) +
  					rte_pktmbuf_priv_size(mb_pool) +
  					RTE_PKTMBUF_HEADROOM;
  
  	umem = rte_zmalloc_socket("umem", sizeof(*umem), 0, rte_socket_id());
  	if (umem == NULL) {
  		AF_XDP_LOG(ERR, "Failed to allocate umem info");
  		return NULL;
  	}
  
  	umem->mb_pool = mb_pool;
  	base_addr = (void *)get_base_addr(mb_pool);
  
  	ret = xsk_umem__create(&umem->umem, base_addr,
  			       mb_pool->populated_size * usr_config.frame_size,
  			       &umem->fq, &umem->cq,
  			       &usr_config);
  
  	if (ret) {
  		AF_XDP_LOG(ERR, "Failed to create umem");
  		goto err;
  	}
  	umem->buffer = base_addr;
  
  #else
  static struct
  xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals,
  				  struct pkt_rx_queue *rxq)
  {
  	struct xsk_umem_info *umem;
  	const struct rte_memzone *mz;
  	struct xsk_umem_config usr_config = {
  		.fill_size = ETH_AF_XDP_DFLT_NUM_DESCS,
  		.comp_size = ETH_AF_XDP_DFLT_NUM_DESCS,
  		.frame_size = ETH_AF_XDP_FRAME_SIZE,
  		.frame_headroom = 0 };
  	char ring_name[RTE_RING_NAMESIZE];
  	char mz_name[RTE_MEMZONE_NAMESIZE];
  	int ret;
  	uint64_t i;
  
  	umem = rte_zmalloc_socket("umem", sizeof(*umem), 0, rte_socket_id());
  	if (umem == NULL) {
  		AF_XDP_LOG(ERR, "Failed to allocate umem info");
  		return NULL;
  	}
  
  	snprintf(ring_name, sizeof(ring_name), "af_xdp_ring_%s_%u",
  		       internals->if_name, rxq->xsk_queue_idx);
  	umem->buf_ring = rte_ring_create(ring_name,
  					 ETH_AF_XDP_NUM_BUFFERS,
  					 rte_socket_id(),
  					 RING_F_SP_ENQ | RING_F_SC_DEQ);
  	if (umem->buf_ring == NULL) {
  		AF_XDP_LOG(ERR, "Failed to create rte_ring\n");
  		goto err;
  	}
  
  	for (i = 0; i < ETH_AF_XDP_NUM_BUFFERS; i++)
  		rte_ring_enqueue(umem->buf_ring,
  				 (void *)(i * ETH_AF_XDP_FRAME_SIZE));
  
  	snprintf(mz_name, sizeof(mz_name), "af_xdp_umem_%s_%u",
  		       internals->if_name, rxq->xsk_queue_idx);
  	mz = rte_memzone_reserve_aligned(mz_name,
  			ETH_AF_XDP_NUM_BUFFERS * ETH_AF_XDP_FRAME_SIZE,
  			rte_socket_id(), RTE_MEMZONE_IOVA_CONTIG,
  			getpagesize());
  	if (mz == NULL) {
  		AF_XDP_LOG(ERR, "Failed to reserve memzone for af_xdp umem.\n");
  		goto err;
  	}
  
  	ret = xsk_umem__create(&umem->umem, mz->addr,
  			       ETH_AF_XDP_NUM_BUFFERS * ETH_AF_XDP_FRAME_SIZE,
  			       &umem->fq, &umem->cq,
  			       &usr_config);
  
  	if (ret) {
  		AF_XDP_LOG(ERR, "Failed to create umem");
  		goto err;
  	}
  	umem->mz = mz;
  
  #endif
  	return umem;
  
  err:
  	xdp_umem_destroy(umem);
  	return NULL;
  }
  
  static int
  xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
  	      int ring_size)
  {
  	struct xsk_socket_config cfg;
  	struct pkt_tx_queue *txq = rxq->pair;
  	int ret = 0;
  	int reserve_size = ETH_AF_XDP_DFLT_NUM_DESCS / 2;
  	struct rte_mbuf *fq_bufs[reserve_size];
  
  	rxq->umem = xdp_umem_configure(internals, rxq);
  	if (rxq->umem == NULL)
  		return -ENOMEM;
  	txq->umem = rxq->umem;
  
  	cfg.rx_size = ring_size;
  	cfg.tx_size = ring_size;
  	cfg.libbpf_flags = 0;
  	cfg.xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
  	cfg.bind_flags = 0;
  
  #if defined(XDP_USE_NEED_WAKEUP)
  	cfg.bind_flags |= XDP_USE_NEED_WAKEUP;
  #endif
  
  	ret = xsk_socket__create(&rxq->xsk, internals->if_name,
  			rxq->xsk_queue_idx, rxq->umem->umem, &rxq->rx,
  			&txq->tx, &cfg);
  	if (ret) {
  		AF_XDP_LOG(ERR, "Failed to create xsk socket.\n");
  		goto err;
  	}
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	if (rte_pktmbuf_alloc_bulk(rxq->umem->mb_pool, fq_bufs, reserve_size)) {
  		AF_XDP_LOG(DEBUG, "Failed to get enough buffers for fq.\n");
  		goto err;
  	}
  #endif
  	ret = reserve_fill_queue(rxq->umem, reserve_size, fq_bufs);
  	if (ret) {
  		xsk_socket__delete(rxq->xsk);
  		AF_XDP_LOG(ERR, "Failed to reserve fill queue.\n");
  		goto err;
  	}
  
  	return 0;
  
  err:
  	xdp_umem_destroy(rxq->umem);
  
  	return ret;
  }
  
  static int
  eth_rx_queue_setup(struct rte_eth_dev *dev,
  		   uint16_t rx_queue_id,
  		   uint16_t nb_rx_desc,
  		   unsigned int socket_id __rte_unused,
  		   const struct rte_eth_rxconf *rx_conf __rte_unused,
  		   struct rte_mempool *mb_pool)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	struct pkt_rx_queue *rxq;
  	int ret;
  
  	rxq = &internals->rx_queues[rx_queue_id];
  
  	AF_XDP_LOG(INFO, "Set up rx queue, rx queue id: %d, xsk queue id: %d\n",
  		   rx_queue_id, rxq->xsk_queue_idx);
  
  #ifndef XDP_UMEM_UNALIGNED_CHUNK_FLAG
  	uint32_t buf_size, data_size;
  
  	/* Now get the space available for data in the mbuf */
  	buf_size = rte_pktmbuf_data_room_size(mb_pool) -
  		RTE_PKTMBUF_HEADROOM;
  	data_size = ETH_AF_XDP_FRAME_SIZE;
  
  	if (data_size > buf_size) {
  		AF_XDP_LOG(ERR, "%s: %d bytes will not fit in mbuf (%d bytes)\n",
  			dev->device->name, data_size, buf_size);
  		ret = -ENOMEM;
  		goto err;
  	}
  #endif
  
  	rxq->mb_pool = mb_pool;
  
  	if (xsk_configure(internals, rxq, nb_rx_desc)) {
  		AF_XDP_LOG(ERR, "Failed to configure xdp socket\n");
  		ret = -EINVAL;
  		goto err;
  	}
  
  	rxq->fds[0].fd = xsk_socket__fd(rxq->xsk);
  	rxq->fds[0].events = POLLIN;
  
  	dev->data->rx_queues[rx_queue_id] = rxq;
  	return 0;
  
  err:
  	return ret;
  }
  
  static int
  eth_tx_queue_setup(struct rte_eth_dev *dev,
  		   uint16_t tx_queue_id,
  		   uint16_t nb_tx_desc __rte_unused,
  		   unsigned int socket_id __rte_unused,
  		   const struct rte_eth_txconf *tx_conf __rte_unused)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	struct pkt_tx_queue *txq;
  
  	txq = &internals->tx_queues[tx_queue_id];
  
  	dev->data->tx_queues[tx_queue_id] = txq;
  	return 0;
  }
  
  static int
  eth_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  	struct ifreq ifr = { .ifr_mtu = mtu };
  	int ret;
  	int s;
  
  	s = socket(PF_INET, SOCK_DGRAM, 0);
  	if (s < 0)
  		return -EINVAL;
  
  	strlcpy(ifr.ifr_name, internals->if_name, IFNAMSIZ);
  	ret = ioctl(s, SIOCSIFMTU, &ifr);
  	close(s);
  
  	return (ret < 0) ? -errno : 0;
  }
  
  static int
  eth_dev_change_flags(char *if_name, uint32_t flags, uint32_t mask)
  {
  	struct ifreq ifr;
  	int ret = 0;
  	int s;
  
  	s = socket(PF_INET, SOCK_DGRAM, 0);
  	if (s < 0)
  		return -errno;
  
  	strlcpy(ifr.ifr_name, if_name, IFNAMSIZ);
  	if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
  		ret = -errno;
  		goto out;
  	}
  	ifr.ifr_flags &= mask;
  	ifr.ifr_flags |= flags;
  	if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0) {
  		ret = -errno;
  		goto out;
  	}
  out:
  	close(s);
  	return ret;
  }
  
  static int
  eth_dev_promiscuous_enable(struct rte_eth_dev *dev)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  
  	return eth_dev_change_flags(internals->if_name, IFF_PROMISC, ~0);
  }
  
  static int
  eth_dev_promiscuous_disable(struct rte_eth_dev *dev)
  {
  	struct pmd_internals *internals = dev->data->dev_private;
  
  	return eth_dev_change_flags(internals->if_name, 0, ~IFF_PROMISC);
  }
  
  static const struct eth_dev_ops ops = {
  	.dev_start = eth_dev_start,
  	.dev_stop = eth_dev_stop,
  	.dev_close = eth_dev_close,
  	.dev_configure = eth_dev_configure,
  	.dev_infos_get = eth_dev_info,
  	.mtu_set = eth_dev_mtu_set,
  	.promiscuous_enable = eth_dev_promiscuous_enable,
  	.promiscuous_disable = eth_dev_promiscuous_disable,
  	.rx_queue_setup = eth_rx_queue_setup,
  	.tx_queue_setup = eth_tx_queue_setup,
  	.rx_queue_release = eth_queue_release,
  	.tx_queue_release = eth_queue_release,
  	.link_update = eth_link_update,
  	.stats_get = eth_stats_get,
  	.stats_reset = eth_stats_reset,
  };
  
  /** parse integer from integer argument */
  static int
  parse_integer_arg(const char *key __rte_unused,
  		  const char *value, void *extra_args)
  {
  	int *i = (int *)extra_args;
  	char *end;
  
  	*i = strtol(value, &end, 10);
  	if (*i < 0) {
  		AF_XDP_LOG(ERR, "Argument has to be positive.\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /** parse name argument */
  static int
  parse_name_arg(const char *key __rte_unused,
  	       const char *value, void *extra_args)
  {
  	char *name = extra_args;
  
  	if (strnlen(value, IFNAMSIZ) > IFNAMSIZ - 1) {
  		AF_XDP_LOG(ERR, "Invalid name %s, should be less than %u bytes.\n",
  			   value, IFNAMSIZ);
  		return -EINVAL;
  	}
  
  	strlcpy(name, value, IFNAMSIZ);
  
  	return 0;
  }
  
  static int
  xdp_get_channels_info(const char *if_name, int *max_queues,
  				int *combined_queues)
  {
  	struct ethtool_channels channels;
  	struct ifreq ifr;
  	int fd, ret;
  
  	fd = socket(AF_INET, SOCK_DGRAM, 0);
  	if (fd < 0)
  		return -1;
  
  	channels.cmd = ETHTOOL_GCHANNELS;
  	ifr.ifr_data = (void *)&channels;
  	strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
  	ret = ioctl(fd, SIOCETHTOOL, &ifr);
  	if (ret) {
  		if (errno == EOPNOTSUPP) {
  			ret = 0;
  		} else {
  			ret = -errno;
  			goto out;
  		}
  	}
  
  	if (channels.max_combined == 0 || errno == EOPNOTSUPP) {
  		/* If the device says it has no channels, then all traffic
  		 * is sent to a single stream, so max queues = 1.
  		 */
  		*max_queues = 1;
  		*combined_queues = 1;
  	} else {
  		*max_queues = channels.max_combined;
  		*combined_queues = channels.combined_count;
  	}
  
   out:
  	close(fd);
  	return ret;
  }
  
  static int
  parse_parameters(struct rte_kvargs *kvlist, char *if_name, int *start_queue,
  			int *queue_cnt)
  {
  	int ret;
  
  	ret = rte_kvargs_process(kvlist, ETH_AF_XDP_IFACE_ARG,
  				 &parse_name_arg, if_name);
  	if (ret < 0)
  		goto free_kvlist;
  
  	ret = rte_kvargs_process(kvlist, ETH_AF_XDP_START_QUEUE_ARG,
  				 &parse_integer_arg, start_queue);
  	if (ret < 0)
  		goto free_kvlist;
  
  	ret = rte_kvargs_process(kvlist, ETH_AF_XDP_QUEUE_COUNT_ARG,
  				 &parse_integer_arg, queue_cnt);
  	if (ret < 0 || *queue_cnt <= 0) {
  		ret = -EINVAL;
  		goto free_kvlist;
  	}
  
  free_kvlist:
  	rte_kvargs_free(kvlist);
  	return ret;
  }
  
  static int
  get_iface_info(const char *if_name,
  	       struct rte_ether_addr *eth_addr,
  	       int *if_index)
  {
  	struct ifreq ifr;
  	int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
  
  	if (sock < 0)
  		return -1;
  
  	strlcpy(ifr.ifr_name, if_name, IFNAMSIZ);
  	if (ioctl(sock, SIOCGIFINDEX, &ifr))
  		goto error;
  
  	*if_index = ifr.ifr_ifindex;
  
  	if (ioctl(sock, SIOCGIFHWADDR, &ifr))
  		goto error;
  
  	rte_memcpy(eth_addr, ifr.ifr_hwaddr.sa_data, RTE_ETHER_ADDR_LEN);
  
  	close(sock);
  	return 0;
  
  error:
  	close(sock);
  	return -1;
  }
  
  static struct rte_eth_dev *
  init_internals(struct rte_vdev_device *dev, const char *if_name,
  			int start_queue_idx, int queue_cnt)
  {
  	const char *name = rte_vdev_device_name(dev);
  	const unsigned int numa_node = dev->device.numa_node;
  	struct pmd_internals *internals;
  	struct rte_eth_dev *eth_dev;
  	int ret;
  	int i;
  
  	internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
  	if (internals == NULL)
  		return NULL;
  
  	internals->start_queue_idx = start_queue_idx;
  	internals->queue_cnt = queue_cnt;
  	strlcpy(internals->if_name, if_name, IFNAMSIZ);
  
  	if (xdp_get_channels_info(if_name, &internals->max_queue_cnt,
  				  &internals->combined_queue_cnt)) {
  		AF_XDP_LOG(ERR, "Failed to get channel info of interface: %s\n",
  				if_name);
  		goto err_free_internals;
  	}
  
  	if (queue_cnt > internals->combined_queue_cnt) {
  		AF_XDP_LOG(ERR, "Specified queue count %d is larger than combined queue count %d.\n",
  				queue_cnt, internals->combined_queue_cnt);
  		goto err_free_internals;
  	}
  
  	internals->rx_queues = rte_zmalloc_socket(NULL,
  					sizeof(struct pkt_rx_queue) * queue_cnt,
  					0, numa_node);
  	if (internals->rx_queues == NULL) {
  		AF_XDP_LOG(ERR, "Failed to allocate memory for rx queues.\n");
  		goto err_free_internals;
  	}
  
  	internals->tx_queues = rte_zmalloc_socket(NULL,
  					sizeof(struct pkt_tx_queue) * queue_cnt,
  					0, numa_node);
  	if (internals->tx_queues == NULL) {
  		AF_XDP_LOG(ERR, "Failed to allocate memory for tx queues.\n");
  		goto err_free_rx;
  	}
  	for (i = 0; i < queue_cnt; i++) {
  		internals->tx_queues[i].pair = &internals->rx_queues[i];
  		internals->rx_queues[i].pair = &internals->tx_queues[i];
  		internals->rx_queues[i].xsk_queue_idx = start_queue_idx + i;
  		internals->tx_queues[i].xsk_queue_idx = start_queue_idx + i;
  	}
  
  	ret = get_iface_info(if_name, &internals->eth_addr,
  			     &internals->if_index);
  	if (ret)
  		goto err_free_tx;
  
  	eth_dev = rte_eth_vdev_allocate(dev, 0);
  	if (eth_dev == NULL)
  		goto err_free_tx;
  
  	eth_dev->data->dev_private = internals;
  	eth_dev->data->dev_link = pmd_link;
  	eth_dev->data->mac_addrs = &internals->eth_addr;
  	eth_dev->dev_ops = &ops;
  	eth_dev->rx_pkt_burst = eth_af_xdp_rx;
  	eth_dev->tx_pkt_burst = eth_af_xdp_tx;
  	/* Let rte_eth_dev_close() release the port resources. */
  	eth_dev->data->dev_flags |= RTE_ETH_DEV_CLOSE_REMOVE;
  
  #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
  	AF_XDP_LOG(INFO, "Zero copy between umem and mbuf enabled.\n");
  #endif
  
  	return eth_dev;
  
  err_free_tx:
  	rte_free(internals->tx_queues);
  err_free_rx:
  	rte_free(internals->rx_queues);
  err_free_internals:
  	rte_free(internals);
  	return NULL;
  }
  
  static int
  rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
  {
  	struct rte_kvargs *kvlist;
  	char if_name[IFNAMSIZ] = {'\0'};
  	int xsk_start_queue_idx = ETH_AF_XDP_DFLT_START_QUEUE_IDX;
  	int xsk_queue_cnt = ETH_AF_XDP_DFLT_QUEUE_COUNT;
  	struct rte_eth_dev *eth_dev = NULL;
  	const char *name;
  
  	AF_XDP_LOG(INFO, "Initializing pmd_af_xdp for %s\n",
  		rte_vdev_device_name(dev));
  
  	name = rte_vdev_device_name(dev);
  	if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
  		strlen(rte_vdev_device_args(dev)) == 0) {
  		eth_dev = rte_eth_dev_attach_secondary(name);
  		if (eth_dev == NULL) {
  			AF_XDP_LOG(ERR, "Failed to probe %s\n", name);
  			return -EINVAL;
  		}
  		eth_dev->dev_ops = &ops;
  		rte_eth_dev_probing_finish(eth_dev);
  		return 0;
  	}
  
  	kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_arguments);
  	if (kvlist == NULL) {
  		AF_XDP_LOG(ERR, "Invalid kvargs key\n");
  		return -EINVAL;
  	}
  
  	if (dev->device.numa_node == SOCKET_ID_ANY)
  		dev->device.numa_node = rte_socket_id();
  
  	if (parse_parameters(kvlist, if_name, &xsk_start_queue_idx,
  			     &xsk_queue_cnt) < 0) {
  		AF_XDP_LOG(ERR, "Invalid kvargs value\n");
  		return -EINVAL;
  	}
  
  	if (strlen(if_name) == 0) {
  		AF_XDP_LOG(ERR, "Network interface must be specified\n");
  		return -EINVAL;
  	}
  
  	eth_dev = init_internals(dev, if_name, xsk_start_queue_idx,
  					xsk_queue_cnt);
  	if (eth_dev == NULL) {
  		AF_XDP_LOG(ERR, "Failed to init internals\n");
  		return -1;
  	}
  
  	rte_eth_dev_probing_finish(eth_dev);
  
  	return 0;
  }
  
  static int
  rte_pmd_af_xdp_remove(struct rte_vdev_device *dev)
  {
  	struct rte_eth_dev *eth_dev = NULL;
  
  	AF_XDP_LOG(INFO, "Removing AF_XDP ethdev on numa socket %u\n",
  		rte_socket_id());
  
  	if (dev == NULL)
  		return -1;
  
  	/* find the ethdev entry */
  	eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
  	if (eth_dev == NULL)
  		return 0;
  
  	eth_dev_close(eth_dev);
  	rte_eth_dev_release_port(eth_dev);
  
  
  	return 0;
  }
  
  static struct rte_vdev_driver pmd_af_xdp_drv = {
  	.probe = rte_pmd_af_xdp_probe,
  	.remove = rte_pmd_af_xdp_remove,
  };
  
  RTE_PMD_REGISTER_VDEV(net_af_xdp, pmd_af_xdp_drv);
  RTE_PMD_REGISTER_PARAM_STRING(net_af_xdp,
  			      "iface=<string> "
  			      "start_queue=<int> "
  			      "queue_count=<int> ");
  
  RTE_INIT(af_xdp_init_log)
  {
  	af_xdp_logtype = rte_log_register("pmd.net.af_xdp");
  	if (af_xdp_logtype >= 0)
  		rte_log_set_level(af_xdp_logtype, RTE_LOG_NOTICE);
  }
  