Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 1861 insertions, 0 deletions

diff --git a/drivers/net/e1000/em_rxtx.c b/drivers/net/e1000/em_rxtx.c
new file mode 100644
index 00000000..441ccad8
--- /dev/null
+++ b/drivers/net/e1000/em_rxtx.c
@@ -0,0 +1,1861 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/queue.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <inttypes.h>
+
+#include <rte_interrupts.h>
+#include <rte_byteorder.h>
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_debug.h>
+#include <rte_pci.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_ring.h>
+#include <rte_mempool.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_prefetch.h>
+#include <rte_ip.h>
+#include <rte_udp.h>
+#include <rte_tcp.h>
+#include <rte_sctp.h>
+#include <rte_string_fns.h>
+
+#include "e1000_logs.h"
+#include "base/e1000_api.h"
+#include "e1000_ethdev.h"
+#include "base/e1000_osdep.h"
+
+#define	E1000_TXD_VLAN_SHIFT	16
+
+#define E1000_RXDCTL_GRAN	0x01000000 /* RXDCTL Granularity */
+
+static inline struct rte_mbuf *
+rte_rxmbuf_alloc(struct rte_mempool *mp)
+{
+	struct rte_mbuf *m;
+
+	m = __rte_mbuf_raw_alloc(mp);
+	__rte_mbuf_sanity_check_raw(m, 0);
+	return m;
+}
+
+/**
+ * Structure associated with each descriptor of the RX ring of a RX queue.
+ */
+struct em_rx_entry {
+	struct rte_mbuf *mbuf; /**< mbuf associated with RX descriptor. */
+};
+
+/**
+ * Structure associated with each descriptor of the TX ring of a TX queue.
+ */
+struct em_tx_entry {
+	struct rte_mbuf *mbuf; /**< mbuf associated with TX desc, if any. */
+	uint16_t next_id; /**< Index of next descriptor in ring. */
+	uint16_t last_id; /**< Index of last scattered descriptor. */
+};
+
+/**
+ * Structure associated with each RX queue.
+ */
+struct em_rx_queue {
+	struct rte_mempool  *mb_pool;   /**< mbuf pool to populate RX ring. */
+	volatile struct e1000_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 em_rx_entry *sw_ring;   /**< address of RX software 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_free_thresh; /**< max free RX desc to hold. */
+	uint16_t            queue_id;   /**< RX queue index. */
+	uint8_t             port_id;    /**< Device port identifier. */
+	uint8_t             pthresh;    /**< Prefetch threshold register. */
+	uint8_t             hthresh;    /**< Host threshold register. */
+	uint8_t             wthresh;    /**< Write-back threshold register. */
+	uint8_t             crc_len;    /**< 0 if CRC stripped, 4 otherwise. */
+};
+
+/**
+ * Hardware context number
+ */
+enum {
+	EM_CTX_0    = 0, /**< CTX0 */
+	EM_CTX_NUM  = 1, /**< CTX NUM */
+};
+
+/** Offload features */
+union em_vlan_macip {
+	uint32_t data;
+	struct {
+		uint16_t l3_len:9; /**< L3 (IP) Header Length. */
+		uint16_t l2_len:7; /**< L2 (MAC) Header Length. */
+		uint16_t vlan_tci;
+		/**< VLAN Tag Control Identifier (CPU order). */
+	} f;
+};
+
+/*
+ * Compare mask for vlan_macip_len.data,
+ * should be in sync with em_vlan_macip.f layout.
+ * */
+#define TX_VLAN_CMP_MASK        0xFFFF0000  /**< VLAN length - 16-bits. */
+#define TX_MAC_LEN_CMP_MASK     0x0000FE00  /**< MAC length - 7-bits. */
+#define TX_IP_LEN_CMP_MASK      0x000001FF  /**< IP  length - 9-bits. */
+/** MAC+IP  length. */
+#define TX_MACIP_LEN_CMP_MASK   (TX_MAC_LEN_CMP_MASK | TX_IP_LEN_CMP_MASK)
+
+/**
+ * Structure to check if new context need be built
+ */
+struct em_ctx_info {
+	uint64_t flags;              /**< ol_flags related to context build. */
+	uint32_t cmp_mask;           /**< compare mask */
+	union em_vlan_macip hdrlen;  /**< L2 and L3 header lenghts */
+};
+
+/**
+ * Structure associated with each TX queue.
+ */
+struct em_tx_queue {
+	volatile struct e1000_data_desc *tx_ring; /**< TX ring address */
+	uint64_t               tx_ring_phys_addr; /**< TX ring DMA address. */
+	struct em_tx_entry    *sw_ring; /**< virtual address of SW ring. */
+	volatile uint32_t      *tdt_reg_addr; /**< Address of TDT register. */
+	uint16_t               nb_tx_desc;    /**< number of TX descriptors. */
+	uint16_t               tx_tail;  /**< Current value of TDT register. */
+	/**< Start freeing TX buffers if there are less free descriptors than
+	     this value. */
+	uint16_t               tx_free_thresh;
+	/**< Number of TX descriptors to use before RS bit is set. */
+	uint16_t               tx_rs_thresh;
+	/** Number of TX descriptors used since RS bit was set. */
+	uint16_t               nb_tx_used;
+	/** Index to last TX descriptor to have been cleaned. */
+	uint16_t	       last_desc_cleaned;
+	/** Total number of TX descriptors ready to be allocated. */
+	uint16_t               nb_tx_free;
+	uint16_t               queue_id; /**< TX queue index. */
+	uint8_t                port_id;  /**< Device port identifier. */
+	uint8_t                pthresh;  /**< Prefetch threshold register. */
+	uint8_t                hthresh;  /**< Host threshold register. */
+	uint8_t                wthresh;  /**< Write-back threshold register. */
+	struct em_ctx_info ctx_cache;
+	/**< Hardware context history.*/
+};
+
+#if 1
+#define RTE_PMD_USE_PREFETCH
+#endif
+
+#ifdef RTE_PMD_USE_PREFETCH
+#define rte_em_prefetch(p)	rte_prefetch0(p)
+#else
+#define rte_em_prefetch(p)	do {} while(0)
+#endif
+
+#ifdef RTE_PMD_PACKET_PREFETCH
+#define rte_packet_prefetch(p) rte_prefetch1(p)
+#else
+#define rte_packet_prefetch(p)	do {} while(0)
+#endif
+
+#ifndef DEFAULT_TX_FREE_THRESH
+#define DEFAULT_TX_FREE_THRESH  32
+#endif /* DEFAULT_TX_FREE_THRESH */
+
+#ifndef DEFAULT_TX_RS_THRESH
+#define DEFAULT_TX_RS_THRESH  32
+#endif /* DEFAULT_TX_RS_THRESH */
+
+
+/*********************************************************************
+ *
+ *  TX function
+ *
+ **********************************************************************/
+
+/*
+ * Populates TX context descriptor.
+ */
+static inline void
+em_set_xmit_ctx(struct em_tx_queue* txq,
+		volatile struct e1000_context_desc *ctx_txd,
+		uint64_t flags,
+		union em_vlan_macip hdrlen)
+{
+	uint32_t cmp_mask, cmd_len;
+	uint16_t ipcse, l2len;
+	struct e1000_context_desc ctx;
+
+	cmp_mask = 0;
+	cmd_len = E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_C;
+
+	l2len = hdrlen.f.l2_len;
+	ipcse = (uint16_t)(l2len + hdrlen.f.l3_len);
+
+	/* setup IPCS* fields */
+	ctx.lower_setup.ip_fields.ipcss = (uint8_t)l2len;
+	ctx.lower_setup.ip_fields.ipcso = (uint8_t)(l2len +
+			offsetof(struct ipv4_hdr, hdr_checksum));
+
+	/*
+	 * When doing checksum or TCP segmentation with IPv6 headers,
+	 * IPCSE field should be set t0 0.
+	 */
+	if (flags & PKT_TX_IP_CKSUM) {
+		ctx.lower_setup.ip_fields.ipcse =
+			(uint16_t)rte_cpu_to_le_16(ipcse - 1);
+		cmd_len |= E1000_TXD_CMD_IP;
+		cmp_mask |= TX_MACIP_LEN_CMP_MASK;
+	} else {
+		ctx.lower_setup.ip_fields.ipcse = 0;
+	}
+
+	/* setup TUCS* fields */
+	ctx.upper_setup.tcp_fields.tucss = (uint8_t)ipcse;
+	ctx.upper_setup.tcp_fields.tucse = 0;
+
+	switch (flags & PKT_TX_L4_MASK) {
+	case PKT_TX_UDP_CKSUM:
+		ctx.upper_setup.tcp_fields.tucso = (uint8_t)(ipcse +
+				offsetof(struct udp_hdr, dgram_cksum));
+		cmp_mask |= TX_MACIP_LEN_CMP_MASK;
+		break;
+	case PKT_TX_TCP_CKSUM:
+		ctx.upper_setup.tcp_fields.tucso = (uint8_t)(ipcse +
+				offsetof(struct tcp_hdr, cksum));
+		cmd_len |= E1000_TXD_CMD_TCP;
+		cmp_mask |= TX_MACIP_LEN_CMP_MASK;
+		break;
+	default:
+		ctx.upper_setup.tcp_fields.tucso = 0;
+	}
+
+	ctx.cmd_and_length = rte_cpu_to_le_32(cmd_len);
+	ctx.tcp_seg_setup.data = 0;
+
+	*ctx_txd = ctx;
+
+	txq->ctx_cache.flags = flags;
+	txq->ctx_cache.cmp_mask = cmp_mask;
+	txq->ctx_cache.hdrlen = hdrlen;
+}
+
+/*
+ * Check which hardware context can be used. Use the existing match
+ * or create a new context descriptor.
+ */
+static inline uint32_t
+what_ctx_update(struct em_tx_queue *txq, uint64_t flags,
+		union em_vlan_macip hdrlen)
+{
+	/* If match with the current context */
+	if (likely (txq->ctx_cache.flags == flags &&
+			((txq->ctx_cache.hdrlen.data ^ hdrlen.data) &
+			txq->ctx_cache.cmp_mask) == 0))
+		return EM_CTX_0;
+
+	/* Mismatch */
+	return EM_CTX_NUM;
+}
+
+/* Reset transmit descriptors after they have been used */
+static inline int
+em_xmit_cleanup(struct em_tx_queue *txq)
+{
+	struct em_tx_entry *sw_ring = txq->sw_ring;
+	volatile struct e1000_data_desc *txr = txq->tx_ring;
+	uint16_t last_desc_cleaned = txq->last_desc_cleaned;
+	uint16_t nb_tx_desc = txq->nb_tx_desc;
+	uint16_t desc_to_clean_to;
+	uint16_t nb_tx_to_clean;
+
+	/* Determine the last descriptor needing to be cleaned */
+	desc_to_clean_to = (uint16_t)(last_desc_cleaned + txq->tx_rs_thresh);
+	if (desc_to_clean_to >= nb_tx_desc)
+		desc_to_clean_to = (uint16_t)(desc_to_clean_to - nb_tx_desc);
+
+	/* Check to make sure the last descriptor to clean is done */
+	desc_to_clean_to = sw_ring[desc_to_clean_to].last_id;
+	if (! (txr[desc_to_clean_to].upper.fields.status & E1000_TXD_STAT_DD))
+	{
+		PMD_TX_FREE_LOG(DEBUG,
+				"TX descriptor %4u is not done"
+				"(port=%d queue=%d)", desc_to_clean_to,
+				txq->port_id, txq->queue_id);
+		/* Failed to clean any descriptors, better luck next time */
+		return -(1);
+	}
+
+	/* Figure out how many descriptors will be cleaned */
+	if (last_desc_cleaned > desc_to_clean_to)
+		nb_tx_to_clean = (uint16_t)((nb_tx_desc - last_desc_cleaned) +
+							desc_to_clean_to);
+	else
+		nb_tx_to_clean = (uint16_t)(desc_to_clean_to -
+						last_desc_cleaned);
+
+	PMD_TX_FREE_LOG(DEBUG,
+			"Cleaning %4u TX descriptors: %4u to %4u "
+			"(port=%d queue=%d)", nb_tx_to_clean,
+			last_desc_cleaned, desc_to_clean_to, txq->port_id,
+			txq->queue_id);
+
+	/*
+	 * The last descriptor to clean is done, so that means all the
+	 * descriptors from the last descriptor that was cleaned
+	 * up to the last descriptor with the RS bit set
+	 * are done. Only reset the threshold descriptor.
+	 */
+	txr[desc_to_clean_to].upper.fields.status = 0;
+
+	/* Update the txq to reflect the last descriptor that was cleaned */
+	txq->last_desc_cleaned = desc_to_clean_to;
+	txq->nb_tx_free = (uint16_t)(txq->nb_tx_free + nb_tx_to_clean);
+
+	/* No Error */
+	return 0;
+}
+
+static inline uint32_t
+tx_desc_cksum_flags_to_upper(uint64_t ol_flags)
+{
+	static const uint32_t l4_olinfo[2] = {0, E1000_TXD_POPTS_TXSM << 8};
+	static const uint32_t l3_olinfo[2] = {0, E1000_TXD_POPTS_IXSM << 8};
+	uint32_t tmp;
+
+	tmp = l4_olinfo[(ol_flags & PKT_TX_L4_MASK) != PKT_TX_L4_NO_CKSUM];
+	tmp |= l3_olinfo[(ol_flags & PKT_TX_IP_CKSUM) != 0];
+	return tmp;
+}
+
+uint16_t
+eth_em_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+		uint16_t nb_pkts)
+{
+	struct em_tx_queue *txq;
+	struct em_tx_entry *sw_ring;
+	struct em_tx_entry *txe, *txn;
+	volatile struct e1000_data_desc *txr;
+	volatile struct e1000_data_desc *txd;
+	struct rte_mbuf     *tx_pkt;
+	struct rte_mbuf     *m_seg;
+	uint64_t buf_dma_addr;
+	uint32_t popts_spec;
+	uint32_t cmd_type_len;
+	uint16_t slen;
+	uint64_t ol_flags;
+	uint16_t tx_id;
+	uint16_t tx_last;
+	uint16_t nb_tx;
+	uint16_t nb_used;
+	uint64_t tx_ol_req;
+	uint32_t ctx;
+	uint32_t new_ctx;
+	union em_vlan_macip hdrlen;
+
+	txq = tx_queue;
+	sw_ring = txq->sw_ring;
+	txr     = txq->tx_ring;
+	tx_id   = txq->tx_tail;
+	txe = &sw_ring[tx_id];
+
+	/* Determine if the descriptor ring needs to be cleaned. */
+	 if (txq->nb_tx_free < txq->tx_free_thresh)
+		em_xmit_cleanup(txq);
+
+	/* TX loop */
+	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
+		new_ctx = 0;
+		tx_pkt = *tx_pkts++;
+
+		RTE_MBUF_PREFETCH_TO_FREE(txe->mbuf);
+
+		/*
+		 * Determine how many (if any) context descriptors
+		 * are needed for offload functionality.
+		 */
+		ol_flags = tx_pkt->ol_flags;
+
+		/* If hardware offload required */
+		tx_ol_req = (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK));
+		if (tx_ol_req) {
+			hdrlen.f.vlan_tci = tx_pkt->vlan_tci;
+			hdrlen.f.l2_len = tx_pkt->l2_len;
+			hdrlen.f.l3_len = tx_pkt->l3_len;
+			/* If new context to be built or reuse the exist ctx. */
+			ctx = what_ctx_update(txq, tx_ol_req, hdrlen);
+
+			/* Only allocate context descriptor if required*/
+			new_ctx = (ctx == EM_CTX_NUM);
+		}
+
+		/*
+		 * Keep track of how many descriptors are used this loop
+		 * This will always be the number of segments + the number of
+		 * Context descriptors required to transmit the packet
+		 */
+		nb_used = (uint16_t)(tx_pkt->nb_segs + new_ctx);
+
+		/*
+		 * The number of descriptors that must be allocated for a
+		 * packet is the number of segments of that packet, plus 1
+		 * Context Descriptor for the hardware offload, if any.
+		 * Determine the last TX descriptor to allocate in the TX ring
+		 * for the packet, starting from the current position (tx_id)
+		 * in the ring.
+		 */
+		tx_last = (uint16_t) (tx_id + nb_used - 1);
+
+		/* Circular ring */
+		if (tx_last >= txq->nb_tx_desc)
+			tx_last = (uint16_t) (tx_last - txq->nb_tx_desc);
+
+		PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u pktlen=%u"
+			   " tx_first=%u tx_last=%u",
+			   (unsigned) txq->port_id,
+			   (unsigned) txq->queue_id,
+			   (unsigned) tx_pkt->pkt_len,
+			   (unsigned) tx_id,
+			   (unsigned) tx_last);
+
+		/*
+		 * Make sure there are enough TX descriptors available to
+		 * transmit the entire packet.
+		 * nb_used better be less than or equal to txq->tx_rs_thresh
+		 */
+		while (unlikely (nb_used > txq->nb_tx_free)) {
+			PMD_TX_FREE_LOG(DEBUG, "Not enough free TX descriptors "
+					"nb_used=%4u nb_free=%4u "
+					"(port=%d queue=%d)",
+					nb_used, txq->nb_tx_free,
+					txq->port_id, txq->queue_id);
+
+			if (em_xmit_cleanup(txq) != 0) {
+				/* Could not clean any descriptors */
+				if (nb_tx == 0)
+					return 0;
+				goto end_of_tx;
+			}
+		}
+
+		/*
+		 * By now there are enough free TX descriptors to transmit
+		 * the packet.
+		 */
+
+		/*
+		 * Set common flags of all TX Data Descriptors.
+		 *
+		 * The following bits must be set in all Data Descriptors:
+		 *    - E1000_TXD_DTYP_DATA
+		 *    - E1000_TXD_DTYP_DEXT
+		 *
+		 * The following bits must be set in the first Data Descriptor
+		 * and are ignored in the other ones:
+		 *    - E1000_TXD_POPTS_IXSM
+		 *    - E1000_TXD_POPTS_TXSM
+		 *
+		 * The following bits must be set in the last Data Descriptor
+		 * and are ignored in the other ones:
+		 *    - E1000_TXD_CMD_VLE
+		 *    - E1000_TXD_CMD_IFCS
+		 *
+		 * The following bits must only be set in the last Data
+		 * Descriptor:
+		 *   - E1000_TXD_CMD_EOP
+		 *
+		 * The following bits can be set in any Data Descriptor, but
+		 * are only set in the last Data Descriptor:
+		 *   - E1000_TXD_CMD_RS
+		 */
+		cmd_type_len = E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
+			E1000_TXD_CMD_IFCS;
+		popts_spec = 0;
+
+		/* Set VLAN Tag offload fields. */
+		if (ol_flags & PKT_TX_VLAN_PKT) {
+			cmd_type_len |= E1000_TXD_CMD_VLE;
+			popts_spec = tx_pkt->vlan_tci << E1000_TXD_VLAN_SHIFT;
+		}
+
+		if (tx_ol_req) {
+			/*
+			 * Setup the TX Context Descriptor if required
+			 */
+			if (new_ctx) {
+				volatile struct e1000_context_desc *ctx_txd;
+
+				ctx_txd = (volatile struct e1000_context_desc *)
+					&txr[tx_id];
+
+				txn = &sw_ring[txe->next_id];
+				RTE_MBUF_PREFETCH_TO_FREE(txn->mbuf);
+
+				if (txe->mbuf != NULL) {
+					rte_pktmbuf_free_seg(txe->mbuf);
+					txe->mbuf = NULL;
+				}
+
+				em_set_xmit_ctx(txq, ctx_txd, tx_ol_req,
+					hdrlen);
+
+				txe->last_id = tx_last;
+				tx_id = txe->next_id;
+				txe = txn;
+			}
+
+			/*
+			 * Setup the TX Data Descriptor,
+			 * This path will go through
+			 * whatever new/reuse the context descriptor
+			 */
+			popts_spec |= tx_desc_cksum_flags_to_upper(ol_flags);
+		}
+
+		m_seg = tx_pkt;
+		do {
+			txd = &txr[tx_id];
+			txn = &sw_ring[txe->next_id];
+
+			if (txe->mbuf != NULL)
+				rte_pktmbuf_free_seg(txe->mbuf);
+			txe->mbuf = m_seg;
+
+			/*
+			 * Set up Transmit Data Descriptor.
+			 */
+			slen = m_seg->data_len;
+			buf_dma_addr = rte_mbuf_data_dma_addr(m_seg);
+
+			txd->buffer_addr = rte_cpu_to_le_64(buf_dma_addr);
+			txd->lower.data = rte_cpu_to_le_32(cmd_type_len | slen);
+			txd->upper.data = rte_cpu_to_le_32(popts_spec);
+
+			txe->last_id = tx_last;
+			tx_id = txe->next_id;
+			txe = txn;
+			m_seg = m_seg->next;
+		} while (m_seg != NULL);
+
+		/*
+		 * The last packet data descriptor needs End Of Packet (EOP)
+		 */
+		cmd_type_len |= E1000_TXD_CMD_EOP;
+		txq->nb_tx_used = (uint16_t)(txq->nb_tx_used + nb_used);
+		txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_used);
+
+		/* Set RS bit only on threshold packets' last descriptor */
+		if (txq->nb_tx_used >= txq->tx_rs_thresh) {
+			PMD_TX_FREE_LOG(DEBUG,
+					"Setting RS bit on TXD id=%4u "
+					"(port=%d queue=%d)",
+					tx_last, txq->port_id, txq->queue_id);
+
+			cmd_type_len |= E1000_TXD_CMD_RS;
+
+			/* Update txq RS bit counters */
+			txq->nb_tx_used = 0;
+		}
+		txd->lower.data |= rte_cpu_to_le_32(cmd_type_len);
+	}
+end_of_tx:
+	rte_wmb();
+
+	/*
+	 * Set the Transmit Descriptor Tail (TDT)
+	 */
+	PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u tx_tail=%u nb_tx=%u",
+		(unsigned) txq->port_id, (unsigned) txq->queue_id,
+		(unsigned) tx_id, (unsigned) nb_tx);
+	E1000_PCI_REG_WRITE(txq->tdt_reg_addr, tx_id);
+	txq->tx_tail = tx_id;
+
+	return nb_tx;
+}
+
+/*********************************************************************
+ *
+ *  RX functions
+ *
+ **********************************************************************/
+
+static inline uint64_t
+rx_desc_status_to_pkt_flags(uint32_t rx_status)
+{
+	uint64_t pkt_flags;
+
+	/* Check if VLAN present */
+	pkt_flags = ((rx_status & E1000_RXD_STAT_VP) ?  PKT_RX_VLAN_PKT : 0);
+
+	return pkt_flags;
+}
+
+static inline uint64_t
+rx_desc_error_to_pkt_flags(uint32_t rx_error)
+{
+	uint64_t pkt_flags = 0;
+
+	if (rx_error & E1000_RXD_ERR_IPE)
+		pkt_flags |= PKT_RX_IP_CKSUM_BAD;
+	if (rx_error & E1000_RXD_ERR_TCPE)
+		pkt_flags |= PKT_RX_L4_CKSUM_BAD;
+	return pkt_flags;
+}
+
+uint16_t
+eth_em_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts)
+{
+	volatile struct e1000_rx_desc *rx_ring;
+	volatile struct e1000_rx_desc *rxdp;
+	struct em_rx_queue *rxq;
+	struct em_rx_entry *sw_ring;
+	struct em_rx_entry *rxe;
+	struct rte_mbuf *rxm;
+	struct rte_mbuf *nmb;
+	struct e1000_rx_desc rxd;
+	uint64_t dma_addr;
+	uint16_t pkt_len;
+	uint16_t rx_id;
+	uint16_t nb_rx;
+	uint16_t nb_hold;
+	uint8_t status;
+
+	rxq = rx_queue;
+
+	nb_rx = 0;
+	nb_hold = 0;
+	rx_id = rxq->rx_tail;
+	rx_ring = rxq->rx_ring;
+	sw_ring = rxq->sw_ring;
+	while (nb_rx < nb_pkts) {
+		/*
+		 * The order of operations here is important as the DD status
+		 * bit must not be read after any other descriptor fields.
+		 * rx_ring and rxdp are pointing to volatile data so the order
+		 * of accesses cannot be reordered by the compiler. If they were
+		 * not volatile, they could be reordered which could lead to
+		 * using invalid descriptor fields when read from rxd.
+		 */
+		rxdp = &rx_ring[rx_id];
+		status = rxdp->status;
+		if (! (status & E1000_RXD_STAT_DD))
+			break;
+		rxd = *rxdp;
+
+		/*
+		 * End of packet.
+		 *
+		 * If the E1000_RXD_STAT_EOP flag is not set, the RX packet is
+		 * likely to be invalid and to be dropped by the various
+		 * validation checks performed by the network stack.
+		 *
+		 * Allocate a new mbuf to replenish the RX ring descriptor.
+		 * If the allocation fails:
+		 *    - arrange for that RX descriptor to be the first one
+		 *      being parsed the next time the receive function is
+		 *      invoked [on the same queue].
+		 *
+		 *    - Stop parsing the RX ring and return immediately.
+		 *
+		 * This policy do not drop the packet received in the RX
+		 * descriptor for which the allocation of a new mbuf failed.
+		 * Thus, it allows that packet to be later retrieved if
+		 * mbuf have been freed in the mean time.
+		 * As a side effect, holding RX descriptors instead of
+		 * systematically giving them back to the NIC may lead to
+		 * RX ring exhaustion situations.
+		 * However, the NIC can gracefully prevent such situations
+		 * to happen by sending specific "back-pressure" flow control
+		 * frames to its peer(s).
+		 */
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u "
+			   "status=0x%x pkt_len=%u",
+			   (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
+			   (unsigned) rx_id, (unsigned) status,
+			   (unsigned) rte_le_to_cpu_16(rxd.length));
+
+		nmb = rte_rxmbuf_alloc(rxq->mb_pool);
+		if (nmb == NULL) {
+			PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
+				   "queue_id=%u",
+				   (unsigned) rxq->port_id,
+				   (unsigned) rxq->queue_id);
+			rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
+			break;
+		}
+
+		nb_hold++;
+		rxe = &sw_ring[rx_id];
+		rx_id++;
+		if (rx_id == rxq->nb_rx_desc)
+			rx_id = 0;
+
+		/* Prefetch next mbuf while processing current one. */
+		rte_em_prefetch(sw_ring[rx_id].mbuf);
+
+		/*
+		 * When next RX descriptor is on a cache-line boundary,
+		 * prefetch the next 4 RX descriptors and the next 8 pointers
+		 * to mbufs.
+		 */
+		if ((rx_id & 0x3) == 0) {
+			rte_em_prefetch(&rx_ring[rx_id]);
+			rte_em_prefetch(&sw_ring[rx_id]);
+		}
+
+		/* Rearm RXD: attach new mbuf and reset status to zero. */
+
+		rxm = rxe->mbuf;
+		rxe->mbuf = nmb;
+		dma_addr =
+			rte_cpu_to_le_64(rte_mbuf_data_dma_addr_default(nmb));
+		rxdp->buffer_addr = dma_addr;
+		rxdp->status = 0;
+
+		/*
+		 * Initialize the returned mbuf.
+		 * 1) setup generic mbuf fields:
+		 *    - number of segments,
+		 *    - next segment,
+		 *    - packet length,
+		 *    - RX port identifier.
+		 * 2) integrate hardware offload data, if any:
+		 *    - RSS flag & hash,
+		 *    - IP checksum flag,
+		 *    - VLAN TCI, if any,
+		 *    - error flags.
+		 */
+		pkt_len = (uint16_t) (rte_le_to_cpu_16(rxd.length) -
+				rxq->crc_len);
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+		rte_packet_prefetch((char *)rxm->buf_addr + rxm->data_off);
+		rxm->nb_segs = 1;
+		rxm->next = NULL;
+		rxm->pkt_len = pkt_len;
+		rxm->data_len = pkt_len;
+		rxm->port = rxq->port_id;
+
+		rxm->ol_flags = rx_desc_status_to_pkt_flags(status);
+		rxm->ol_flags = rxm->ol_flags |
+				rx_desc_error_to_pkt_flags(rxd.errors);
+
+		/* Only valid if PKT_RX_VLAN_PKT set in pkt_flags */
+		rxm->vlan_tci = rte_le_to_cpu_16(rxd.special);
+
+		/*
+		 * Store the mbuf address into the next entry of the array
+		 * of returned packets.
+		 */
+		rx_pkts[nb_rx++] = rxm;
+	}
+	rxq->rx_tail = rx_id;
+
+	/*
+	 * If the number of free RX descriptors is greater than the RX free
+	 * threshold of the queue, advance the Receive Descriptor Tail (RDT)
+	 * register.
+	 * Update the RDT with the value of the last processed RX descriptor
+	 * minus 1, to guarantee that the RDT register is never equal to the
+	 * RDH register, which creates a "full" ring situtation from the
+	 * hardware point of view...
+	 */
+	nb_hold = (uint16_t) (nb_hold + rxq->nb_rx_hold);
+	if (nb_hold > rxq->rx_free_thresh) {
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
+			   "nb_hold=%u nb_rx=%u",
+			   (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
+			   (unsigned) rx_id, (unsigned) nb_hold,
+			   (unsigned) nb_rx);
+		rx_id = (uint16_t) ((rx_id == 0) ?
+			(rxq->nb_rx_desc - 1) : (rx_id - 1));
+		E1000_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
+		nb_hold = 0;
+	}
+	rxq->nb_rx_hold = nb_hold;
+	return nb_rx;
+}
+
+uint16_t
+eth_em_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+			 uint16_t nb_pkts)
+{
+	struct em_rx_queue *rxq;
+	volatile struct e1000_rx_desc *rx_ring;
+	volatile struct e1000_rx_desc *rxdp;
+	struct em_rx_entry *sw_ring;
+	struct em_rx_entry *rxe;
+	struct rte_mbuf *first_seg;
+	struct rte_mbuf *last_seg;
+	struct rte_mbuf *rxm;
+	struct rte_mbuf *nmb;
+	struct e1000_rx_desc rxd;
+	uint64_t dma; /* Physical address of mbuf data buffer */
+	uint16_t rx_id;
+	uint16_t nb_rx;
+	uint16_t nb_hold;
+	uint16_t data_len;
+	uint8_t status;
+
+	rxq = rx_queue;
+
+	nb_rx = 0;
+	nb_hold = 0;
+	rx_id = rxq->rx_tail;
+	rx_ring = rxq->rx_ring;
+	sw_ring = rxq->sw_ring;
+
+	/*
+	 * Retrieve RX context of current packet, if any.
+	 */
+	first_seg = rxq->pkt_first_seg;
+	last_seg = rxq->pkt_last_seg;
+
+	while (nb_rx < nb_pkts) {
+	next_desc:
+		/*
+		 * The order of operations here is important as the DD status
+		 * bit must not be read after any other descriptor fields.
+		 * rx_ring and rxdp are pointing to volatile data so the order
+		 * of accesses cannot be reordered by the compiler. If they were
+		 * not volatile, they could be reordered which could lead to
+		 * using invalid descriptor fields when read from rxd.
+		 */
+		rxdp = &rx_ring[rx_id];
+		status = rxdp->status;
+		if (! (status & E1000_RXD_STAT_DD))
+			break;
+		rxd = *rxdp;
+
+		/*
+		 * Descriptor done.
+		 *
+		 * Allocate a new mbuf to replenish the RX ring descriptor.
+		 * If the allocation fails:
+		 *    - arrange for that RX descriptor to be the first one
+		 *      being parsed the next time the receive function is
+		 *      invoked [on the same queue].
+		 *
+		 *    - Stop parsing the RX ring and return immediately.
+		 *
+		 * This policy does not drop the packet received in the RX
+		 * descriptor for which the allocation of a new mbuf failed.
+		 * Thus, it allows that packet to be later retrieved if
+		 * mbuf have been freed in the mean time.
+		 * As a side effect, holding RX descriptors instead of
+		 * systematically giving them back to the NIC may lead to
+		 * RX ring exhaustion situations.
+		 * However, the NIC can gracefully prevent such situations
+		 * to happen by sending specific "back-pressure" flow control
+		 * frames to its peer(s).
+		 */
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u "
+			   "status=0x%x data_len=%u",
+			   (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
+			   (unsigned) rx_id, (unsigned) status,
+			   (unsigned) rte_le_to_cpu_16(rxd.length));
+
+		nmb = rte_rxmbuf_alloc(rxq->mb_pool);
+		if (nmb == NULL) {
+			PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
+				   "queue_id=%u", (unsigned) rxq->port_id,
+				   (unsigned) rxq->queue_id);
+			rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
+			break;
+		}
+
+		nb_hold++;
+		rxe = &sw_ring[rx_id];
+		rx_id++;
+		if (rx_id == rxq->nb_rx_desc)
+			rx_id = 0;
+
+		/* Prefetch next mbuf while processing current one. */
+		rte_em_prefetch(sw_ring[rx_id].mbuf);
+
+		/*
+		 * When next RX descriptor is on a cache-line boundary,
+		 * prefetch the next 4 RX descriptors and the next 8 pointers
+		 * to mbufs.
+		 */
+		if ((rx_id & 0x3) == 0) {
+			rte_em_prefetch(&rx_ring[rx_id]);
+			rte_em_prefetch(&sw_ring[rx_id]);
+		}
+
+		/*
+		 * Update RX descriptor with the physical address of the new
+		 * data buffer of the new allocated mbuf.
+		 */
+		rxm = rxe->mbuf;
+		rxe->mbuf = nmb;
+		dma = rte_cpu_to_le_64(rte_mbuf_data_dma_addr_default(nmb));
+		rxdp->buffer_addr = dma;
+		rxdp->status = 0;
+
+		/*
+		 * Set data length & data buffer address of mbuf.
+		 */
+		data_len = rte_le_to_cpu_16(rxd.length);
+		rxm->data_len = data_len;
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+
+		/*
+		 * If this is the first buffer of the received packet,
+		 * set the pointer to the first mbuf of the packet and
+		 * initialize its context.
+		 * Otherwise, update the total length and the number of segments
+		 * of the current scattered packet, and update the pointer to
+		 * the last mbuf of the current packet.
+		 */
+		if (first_seg == NULL) {
+			first_seg = rxm;
+			first_seg->pkt_len = data_len;
+			first_seg->nb_segs = 1;
+		} else {
+			first_seg->pkt_len += data_len;
+			first_seg->nb_segs++;
+			last_seg->next = rxm;
+		}
+
+		/*
+		 * If this is not the last buffer of the received packet,
+		 * update the pointer to the last mbuf of the current scattered
+		 * packet and continue to parse the RX ring.
+		 */
+		if (! (status & E1000_RXD_STAT_EOP)) {
+			last_seg = rxm;
+			goto next_desc;
+		}
+
+		/*
+		 * This is the last buffer of the received packet.
+		 * If the CRC is not stripped by the hardware:
+		 *   - Subtract the CRC	length from the total packet length.
+		 *   - If the last buffer only contains the whole CRC or a part
+		 *     of it, free the mbuf associated to the last buffer.
+		 *     If part of the CRC is also contained in the previous
+		 *     mbuf, subtract the length of that CRC part from the
+		 *     data length of the previous mbuf.
+		 */
+		rxm->next = NULL;
+		if (unlikely(rxq->crc_len > 0)) {
+			first_seg->pkt_len -= ETHER_CRC_LEN;
+			if (data_len <= ETHER_CRC_LEN) {
+				rte_pktmbuf_free_seg(rxm);
+				first_seg->nb_segs--;
+				last_seg->data_len = (uint16_t)
+					(last_seg->data_len -
+					 (ETHER_CRC_LEN - data_len));
+				last_seg->next = NULL;
+			} else
+				rxm->data_len =
+					(uint16_t) (data_len - ETHER_CRC_LEN);
+		}
+
+		/*
+		 * Initialize the first mbuf of the returned packet:
+		 *    - RX port identifier,
+		 *    - hardware offload data, if any:
+		 *      - IP checksum flag,
+		 *      - error flags.
+		 */
+		first_seg->port = rxq->port_id;
+
+		first_seg->ol_flags = rx_desc_status_to_pkt_flags(status);
+		first_seg->ol_flags = first_seg->ol_flags |
+					rx_desc_error_to_pkt_flags(rxd.errors);
+
+		/* Only valid if PKT_RX_VLAN_PKT set in pkt_flags */
+		rxm->vlan_tci = rte_le_to_cpu_16(rxd.special);
+
+		/* Prefetch data of first segment, if configured to do so. */
+		rte_packet_prefetch((char *)first_seg->buf_addr +
+			first_seg->data_off);
+
+		/*
+		 * Store the mbuf address into the next entry of the array
+		 * of returned packets.
+		 */
+		rx_pkts[nb_rx++] = first_seg;
+
+		/*
+		 * Setup receipt context for a new packet.
+		 */
+		first_seg = NULL;
+	}
+
+	/*
+	 * Record index of the next RX descriptor to probe.
+	 */
+	rxq->rx_tail = rx_id;
+
+	/*
+	 * Save receive context.
+	 */
+	rxq->pkt_first_seg = first_seg;
+	rxq->pkt_last_seg = last_seg;
+
+	/*
+	 * If the number of free RX descriptors is greater than the RX free
+	 * threshold of the queue, advance the Receive Descriptor Tail (RDT)
+	 * register.
+	 * Update the RDT with the value of the last processed RX descriptor
+	 * minus 1, to guarantee that the RDT register is never equal to the
+	 * RDH register, which creates a "full" ring situtation from the
+	 * hardware point of view...
+	 */
+	nb_hold = (uint16_t) (nb_hold + rxq->nb_rx_hold);
+	if (nb_hold > rxq->rx_free_thresh) {
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
+			   "nb_hold=%u nb_rx=%u",
+			   (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
+			   (unsigned) rx_id, (unsigned) nb_hold,
+			   (unsigned) nb_rx);
+		rx_id = (uint16_t) ((rx_id == 0) ?
+			(rxq->nb_rx_desc - 1) : (rx_id - 1));
+		E1000_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
+		nb_hold = 0;
+	}
+	rxq->nb_rx_hold = nb_hold;
+	return nb_rx;
+}
+
+#define	EM_MAX_BUF_SIZE     16384
+#define EM_RCTL_FLXBUF_STEP 1024
+
+static void
+em_tx_queue_release_mbufs(struct em_tx_queue *txq)
+{
+	unsigned i;
+
+	if (txq->sw_ring != NULL) {
+		for (i = 0; i != txq->nb_tx_desc; i++) {
+			if (txq->sw_ring[i].mbuf != NULL) {
+				rte_pktmbuf_free_seg(txq->sw_ring[i].mbuf);
+				txq->sw_ring[i].mbuf = NULL;
+			}
+		}
+	}
+}
+
+static void
+em_tx_queue_release(struct em_tx_queue *txq)
+{
+	if (txq != NULL) {
+		em_tx_queue_release_mbufs(txq);
+		rte_free(txq->sw_ring);
+		rte_free(txq);
+	}
+}
+
+void
+eth_em_tx_queue_release(void *txq)
+{
+	em_tx_queue_release(txq);
+}
+
+/* (Re)set dynamic em_tx_queue fields to defaults */
+static void
+em_reset_tx_queue(struct em_tx_queue *txq)
+{
+	uint16_t i, nb_desc, prev;
+	static const struct e1000_data_desc txd_init = {
+		.upper.fields = {.status = E1000_TXD_STAT_DD},
+	};
+
+	nb_desc = txq->nb_tx_desc;
+
+	/* Initialize ring entries */
+
+	prev = (uint16_t) (nb_desc - 1);
+
+	for (i = 0; i < nb_desc; i++) {
+		txq->tx_ring[i] = txd_init;
+		txq->sw_ring[i].mbuf = NULL;
+		txq->sw_ring[i].last_id = i;
+		txq->sw_ring[prev].next_id = i;
+		prev = i;
+	}
+
+	/*
+	 * Always allow 1 descriptor to be un-allocated to avoid
+	 * a H/W race condition
+	 */
+	txq->nb_tx_free = (uint16_t)(nb_desc - 1);
+	txq->last_desc_cleaned = (uint16_t)(nb_desc - 1);
+	txq->nb_tx_used = 0;
+	txq->tx_tail = 0;
+
+	memset((void*)&txq->ctx_cache, 0, sizeof (txq->ctx_cache));
+}
+
+int
+eth_em_tx_queue_setup(struct rte_eth_dev *dev,
+			 uint16_t queue_idx,
+			 uint16_t nb_desc,
+			 unsigned int socket_id,
+			 const struct rte_eth_txconf *tx_conf)
+{
+	const struct rte_memzone *tz;
+	struct em_tx_queue *txq;
+	struct e1000_hw     *hw;
+	uint32_t tsize;
+	uint16_t tx_rs_thresh, tx_free_thresh;
+
+	hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/*
+	 * Validate number of transmit descriptors.
+	 * It must not exceed hardware maximum, and must be multiple
+	 * of E1000_ALIGN.
+	 */
+	if (nb_desc % EM_TXD_ALIGN != 0 ||
+			(nb_desc > E1000_MAX_RING_DESC) ||
+			(nb_desc < E1000_MIN_RING_DESC)) {
+		return -(EINVAL);
+	}
+
+	tx_free_thresh = tx_conf->tx_free_thresh;
+	if (tx_free_thresh == 0)
+		tx_free_thresh = (uint16_t)RTE_MIN(nb_desc / 4,
+					DEFAULT_TX_FREE_THRESH);
+
+	tx_rs_thresh = tx_conf->tx_rs_thresh;
+	if (tx_rs_thresh == 0)
+		tx_rs_thresh = (uint16_t)RTE_MIN(tx_free_thresh,
+					DEFAULT_TX_RS_THRESH);
+
+	if (tx_free_thresh >= (nb_desc - 3)) {
+		PMD_INIT_LOG(ERR, "tx_free_thresh must be less than the "
+			     "number of TX descriptors minus 3. "
+			     "(tx_free_thresh=%u port=%d queue=%d)",
+			     (unsigned int)tx_free_thresh,
+			     (int)dev->data->port_id, (int)queue_idx);
+		return -(EINVAL);
+	}
+	if (tx_rs_thresh > tx_free_thresh) {
+		PMD_INIT_LOG(ERR, "tx_rs_thresh must be less than or equal to "
+			     "tx_free_thresh. (tx_free_thresh=%u "
+			     "tx_rs_thresh=%u port=%d queue=%d)",
+			     (unsigned int)tx_free_thresh,
+			     (unsigned int)tx_rs_thresh,
+			     (int)dev->data->port_id,
+			     (int)queue_idx);
+		return -(EINVAL);
+	}
+
+	/*
+	 * If rs_bit_thresh is greater than 1, then TX WTHRESH should be
+	 * set to 0. If WTHRESH is greater than zero, the RS bit is ignored
+	 * by the NIC and all descriptors are written back after the NIC
+	 * accumulates WTHRESH descriptors.
+	 */
+	if (tx_conf->tx_thresh.wthresh != 0 && tx_rs_thresh != 1) {
+		PMD_INIT_LOG(ERR, "TX WTHRESH must be set to 0 if "
+			     "tx_rs_thresh is greater than 1. (tx_rs_thresh=%u "
+			     "port=%d queue=%d)", (unsigned int)tx_rs_thresh,
+			     (int)dev->data->port_id, (int)queue_idx);
+		return -(EINVAL);
+	}
+
+	/* Free memory prior to re-allocation if needed... */
+	if (dev->data->tx_queues[queue_idx] != NULL) {
+		em_tx_queue_release(dev->data->tx_queues[queue_idx]);
+		dev->data->tx_queues[queue_idx] = NULL;
+	}
+
+	/*
+	 * Allocate TX ring hardware descriptors. A memzone large enough to
+	 * handle the maximum ring size is allocated in order to allow for
+	 * resizing in later calls to the queue setup function.
+	 */
+	tsize = sizeof(txq->tx_ring[0]) * E1000_MAX_RING_DESC;
+	tz = rte_eth_dma_zone_reserve(dev, "tx_ring", queue_idx, tsize,
+				      RTE_CACHE_LINE_SIZE, socket_id);
+	if (tz == NULL)
+		return -ENOMEM;
+
+	/* Allocate the tx queue data structure. */
+	if ((txq = rte_zmalloc("ethdev TX queue", sizeof(*txq),
+			RTE_CACHE_LINE_SIZE)) == NULL)
+		return -ENOMEM;
+
+	/* Allocate software ring */
+	if ((txq->sw_ring = rte_zmalloc("txq->sw_ring",
+			sizeof(txq->sw_ring[0]) * nb_desc,
+			RTE_CACHE_LINE_SIZE)) == NULL) {
+		em_tx_queue_release(txq);
+		return -ENOMEM;
+	}
+
+	txq->nb_tx_desc = nb_desc;
+	txq->tx_free_thresh = tx_free_thresh;
+	txq->tx_rs_thresh = tx_rs_thresh;
+	txq->pthresh = tx_conf->tx_thresh.pthresh;
+	txq->hthresh = tx_conf->tx_thresh.hthresh;
+	txq->wthresh = tx_conf->tx_thresh.wthresh;
+	txq->queue_id = queue_idx;
+	txq->port_id = dev->data->port_id;
+
+	txq->tdt_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_TDT(queue_idx));
+	txq->tx_ring_phys_addr = rte_mem_phy2mch(tz->memseg_id, tz->phys_addr);
+	txq->tx_ring = (struct e1000_data_desc *) tz->addr;
+
+	PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64,
+		     txq->sw_ring, txq->tx_ring, txq->tx_ring_phys_addr);
+
+	em_reset_tx_queue(txq);
+
+	dev->data->tx_queues[queue_idx] = txq;
+	return 0;
+}
+
+static void
+em_rx_queue_release_mbufs(struct em_rx_queue *rxq)
+{
+	unsigned i;
+
+	if (rxq->sw_ring != NULL) {
+		for (i = 0; i != rxq->nb_rx_desc; i++) {
+			if (rxq->sw_ring[i].mbuf != NULL) {
+				rte_pktmbuf_free_seg(rxq->sw_ring[i].mbuf);
+				rxq->sw_ring[i].mbuf = NULL;
+			}
+		}
+	}
+}
+
+static void
+em_rx_queue_release(struct em_rx_queue *rxq)
+{
+	if (rxq != NULL) {
+		em_rx_queue_release_mbufs(rxq);
+		rte_free(rxq->sw_ring);
+		rte_free(rxq);
+	}
+}
+
+void
+eth_em_rx_queue_release(void *rxq)
+{
+	em_rx_queue_release(rxq);
+}
+
+/* Reset dynamic em_rx_queue fields back to defaults */
+static void
+em_reset_rx_queue(struct em_rx_queue *rxq)
+{
+	rxq->rx_tail = 0;
+	rxq->nb_rx_hold = 0;
+	rxq->pkt_first_seg = NULL;
+	rxq->pkt_last_seg = NULL;
+}
+
+int
+eth_em_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 em_rx_queue *rxq;
+	struct e1000_hw     *hw;
+	uint32_t rsize;
+
+	hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/*
+	 * Validate number of receive descriptors.
+	 * It must not exceed hardware maximum, and must be multiple
+	 * of E1000_ALIGN.
+	 */
+	if (nb_desc % EM_RXD_ALIGN != 0 ||
+			(nb_desc > E1000_MAX_RING_DESC) ||
+			(nb_desc < E1000_MIN_RING_DESC)) {
+		return -EINVAL;
+	}
+
+	/*
+	 * EM devices don't support drop_en functionality
+	 */
+	if (rx_conf->rx_drop_en) {
+		PMD_INIT_LOG(ERR, "drop_en functionality not supported by "
+			     "device");
+		return -EINVAL;
+	}
+
+	/* Free memory prior to re-allocation if needed. */
+	if (dev->data->rx_queues[queue_idx] != NULL) {
+		em_rx_queue_release(dev->data->rx_queues[queue_idx]);
+		dev->data->rx_queues[queue_idx] = NULL;
+	}
+
+	/* Allocate RX ring for max possible mumber of hardware descriptors. */
+	rsize = sizeof(rxq->rx_ring[0]) * E1000_MAX_RING_DESC;
+	rz = rte_eth_dma_zone_reserve(dev, "rx_ring", queue_idx, rsize,
+				      RTE_CACHE_LINE_SIZE, socket_id);
+	if (rz == NULL)
+		return -ENOMEM;
+
+	/* Allocate the RX queue data structure. */
+	if ((rxq = rte_zmalloc("ethdev RX queue", sizeof(*rxq),
+			RTE_CACHE_LINE_SIZE)) == NULL)
+		return -ENOMEM;
+
+	/* Allocate software ring. */
+	if ((rxq->sw_ring = rte_zmalloc("rxq->sw_ring",
+			sizeof (rxq->sw_ring[0]) * nb_desc,
+			RTE_CACHE_LINE_SIZE)) == NULL) {
+		em_rx_queue_release(rxq);
+		return -ENOMEM;
+	}
+
+	rxq->mb_pool = mp;
+	rxq->nb_rx_desc = nb_desc;
+	rxq->pthresh = rx_conf->rx_thresh.pthresh;
+	rxq->hthresh = rx_conf->rx_thresh.hthresh;
+	rxq->wthresh = rx_conf->rx_thresh.wthresh;
+	rxq->rx_free_thresh = rx_conf->rx_free_thresh;
+	rxq->queue_id = queue_idx;
+	rxq->port_id = dev->data->port_id;
+	rxq->crc_len = (uint8_t) ((dev->data->dev_conf.rxmode.hw_strip_crc) ?
+				0 : ETHER_CRC_LEN);
+
+	rxq->rdt_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_RDT(queue_idx));
+	rxq->rdh_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_RDH(queue_idx));
+	rxq->rx_ring_phys_addr = rte_mem_phy2mch(rz->memseg_id, rz->phys_addr);
+	rxq->rx_ring = (struct e1000_rx_desc *) rz->addr;
+
+	PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64,
+		     rxq->sw_ring, rxq->rx_ring, rxq->rx_ring_phys_addr);
+
+	dev->data->rx_queues[queue_idx] = rxq;
+	em_reset_rx_queue(rxq);
+
+	return 0;
+}
+
+uint32_t
+eth_em_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
+{
+#define EM_RXQ_SCAN_INTERVAL 4
+	volatile struct e1000_rx_desc *rxdp;
+	struct em_rx_queue *rxq;
+	uint32_t desc = 0;
+
+	if (rx_queue_id >= dev->data->nb_rx_queues) {
+		PMD_RX_LOG(DEBUG, "Invalid RX queue_id=%d", rx_queue_id);
+		return 0;
+	}
+
+	rxq = dev->data->rx_queues[rx_queue_id];
+	rxdp = &(rxq->rx_ring[rxq->rx_tail]);
+
+	while ((desc < rxq->nb_rx_desc) &&
+		(rxdp->status & E1000_RXD_STAT_DD)) {
+		desc += EM_RXQ_SCAN_INTERVAL;
+		rxdp += EM_RXQ_SCAN_INTERVAL;
+		if (rxq->rx_tail + desc >= rxq->nb_rx_desc)
+			rxdp = &(rxq->rx_ring[rxq->rx_tail +
+				desc - rxq->nb_rx_desc]);
+	}
+
+	return desc;
+}
+
+int
+eth_em_rx_descriptor_done(void *rx_queue, uint16_t offset)
+{
+	volatile struct e1000_rx_desc *rxdp;
+	struct em_rx_queue *rxq = rx_queue;
+	uint32_t desc;
+
+	if (unlikely(offset >= rxq->nb_rx_desc))
+		return 0;
+	desc = rxq->rx_tail + offset;
+	if (desc >= rxq->nb_rx_desc)
+		desc -= rxq->nb_rx_desc;
+
+	rxdp = &rxq->rx_ring[desc];
+	return !!(rxdp->status & E1000_RXD_STAT_DD);
+}
+
+void
+em_dev_clear_queues(struct rte_eth_dev *dev)
+{
+	uint16_t i;
+	struct em_tx_queue *txq;
+	struct em_rx_queue *rxq;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		txq = dev->data->tx_queues[i];
+		if (txq != NULL) {
+			em_tx_queue_release_mbufs(txq);
+			em_reset_tx_queue(txq);
+		}
+	}
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+		if (rxq != NULL) {
+			em_rx_queue_release_mbufs(rxq);
+			em_reset_rx_queue(rxq);
+		}
+	}
+}
+
+void
+em_dev_free_queues(struct rte_eth_dev *dev)
+{
+	uint16_t i;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		eth_em_rx_queue_release(dev->data->rx_queues[i]);
+		dev->data->rx_queues[i] = NULL;
+	}
+	dev->data->nb_rx_queues = 0;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		eth_em_tx_queue_release(dev->data->tx_queues[i]);
+		dev->data->tx_queues[i] = NULL;
+	}
+	dev->data->nb_tx_queues = 0;
+}
+
+/*
+ * Takes as input/output parameter RX buffer size.
+ * Returns (BSIZE | BSEX | FLXBUF) fields of RCTL register.
+ */
+static uint32_t
+em_rctl_bsize(__rte_unused enum e1000_mac_type hwtyp, uint32_t *bufsz)
+{
+	/*
+	 * For BSIZE & BSEX all configurable sizes are:
+	 * 16384: rctl |= (E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX);
+	 *  8192: rctl |= (E1000_RCTL_SZ_8192  | E1000_RCTL_BSEX);
+	 *  4096: rctl |= (E1000_RCTL_SZ_4096  | E1000_RCTL_BSEX);
+	 *  2048: rctl |= E1000_RCTL_SZ_2048;
+	 *  1024: rctl |= E1000_RCTL_SZ_1024;
+	 *   512: rctl |= E1000_RCTL_SZ_512;
+	 *   256: rctl |= E1000_RCTL_SZ_256;
+	 */
+	static const struct {
+		uint32_t bufsz;
+		uint32_t rctl;
+	} bufsz_to_rctl[] = {
+		{16384, (E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX)},
+		{8192,  (E1000_RCTL_SZ_8192  | E1000_RCTL_BSEX)},
+		{4096,  (E1000_RCTL_SZ_4096  | E1000_RCTL_BSEX)},
+		{2048,  E1000_RCTL_SZ_2048},
+		{1024,  E1000_RCTL_SZ_1024},
+		{512,   E1000_RCTL_SZ_512},
+		{256,   E1000_RCTL_SZ_256},
+	};
+
+	int i;
+	uint32_t rctl_bsize;
+
+	rctl_bsize = *bufsz;
+
+	/*
+	 * Starting from 82571 it is possible to specify RX buffer size
+	 * by RCTL.FLXBUF. When this field is different from zero, the
+	 * RX buffer size = RCTL.FLXBUF * 1K
+	 * (e.g. t is possible to specify RX buffer size  1,2,...,15KB).
+	 * It is working ok on real HW, but by some reason doesn't work
+	 * on VMware emulated 82574L.
+	 * So for now, always use BSIZE/BSEX to setup RX buffer size.
+	 * If you don't plan to use it on VMware emulated 82574L and
+	 * would like to specify RX buffer size in 1K granularity,
+	 * uncomment the following lines:
+	 * ***************************************************************
+	 * if (hwtyp >= e1000_82571 && hwtyp <= e1000_82574 &&
+	 *		rctl_bsize >= EM_RCTL_FLXBUF_STEP) {
+	 *	rctl_bsize /= EM_RCTL_FLXBUF_STEP;
+	 *	*bufsz = rctl_bsize;
+	 *	return (rctl_bsize << E1000_RCTL_FLXBUF_SHIFT &
+	 *		E1000_RCTL_FLXBUF_MASK);
+	 * }
+	 * ***************************************************************
+	 */
+
+	for (i = 0; i != sizeof(bufsz_to_rctl) / sizeof(bufsz_to_rctl[0]);
+			i++) {
+		if (rctl_bsize >= bufsz_to_rctl[i].bufsz) {
+			*bufsz = bufsz_to_rctl[i].bufsz;
+			return bufsz_to_rctl[i].rctl;
+		}
+	}
+
+	/* Should never happen. */
+	return -EINVAL;
+}
+
+static int
+em_alloc_rx_queue_mbufs(struct em_rx_queue *rxq)
+{
+	struct em_rx_entry *rxe = rxq->sw_ring;
+	uint64_t dma_addr;
+	unsigned i;
+	static const struct e1000_rx_desc rxd_init = {
+		.buffer_addr = 0,
+	};
+
+	/* Initialize software ring entries */
+	for (i = 0; i < rxq->nb_rx_desc; i++) {
+		volatile struct e1000_rx_desc *rxd;
+		struct rte_mbuf *mbuf = rte_rxmbuf_alloc(rxq->mb_pool);
+
+		if (mbuf == NULL) {
+			PMD_INIT_LOG(ERR, "RX mbuf alloc failed "
+				     "queue_id=%hu", rxq->queue_id);
+			return -ENOMEM;
+		}
+
+		dma_addr =
+			rte_cpu_to_le_64(rte_mbuf_data_dma_addr_default(mbuf));
+
+		/* Clear HW ring memory */
+		rxq->rx_ring[i] = rxd_init;
+
+		rxd = &rxq->rx_ring[i];
+		rxd->buffer_addr = dma_addr;
+		rxe[i].mbuf = mbuf;
+	}
+
+	return 0;
+}
+
+/*********************************************************************
+ *
+ *  Enable receive unit.
+ *
+ **********************************************************************/
+int
+eth_em_rx_init(struct rte_eth_dev *dev)
+{
+	struct e1000_hw *hw;
+	struct em_rx_queue *rxq;
+	uint32_t rctl;
+	uint32_t rfctl;
+	uint32_t rxcsum;
+	uint32_t rctl_bsize;
+	uint16_t i;
+	int ret;
+
+	hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/*
+	 * Make sure receives are disabled while setting
+	 * up the descriptor ring.
+	 */
+	rctl = E1000_READ_REG(hw, E1000_RCTL);
+	E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
+
+	rfctl = E1000_READ_REG(hw, E1000_RFCTL);
+
+	/* Disable extended descriptor type. */
+	rfctl &= ~E1000_RFCTL_EXTEN;
+	/* Disable accelerated acknowledge */
+	if (hw->mac.type == e1000_82574)
+		rfctl |= E1000_RFCTL_ACK_DIS;
+
+	E1000_WRITE_REG(hw, E1000_RFCTL, rfctl);
+
+	/*
+	 * XXX TEMPORARY WORKAROUND: on some systems with 82573
+	 * long latencies are observed, like Lenovo X60. This
+	 * change eliminates the problem, but since having positive
+	 * values in RDTR is a known source of problems on other
+	 * platforms another solution is being sought.
+	 */
+	if (hw->mac.type == e1000_82573)
+		E1000_WRITE_REG(hw, E1000_RDTR, 0x20);
+
+	dev->rx_pkt_burst = (eth_rx_burst_t)eth_em_recv_pkts;
+
+	/* Determine RX bufsize. */
+	rctl_bsize = EM_MAX_BUF_SIZE;
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		uint32_t buf_size;
+
+		rxq = dev->data->rx_queues[i];
+		buf_size = rte_pktmbuf_data_room_size(rxq->mb_pool) -
+			RTE_PKTMBUF_HEADROOM;
+		rctl_bsize = RTE_MIN(rctl_bsize, buf_size);
+	}
+
+	rctl |= em_rctl_bsize(hw->mac.type, &rctl_bsize);
+
+	/* Configure and enable each RX queue. */
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		uint64_t bus_addr;
+		uint32_t rxdctl;
+
+		rxq = dev->data->rx_queues[i];
+
+		/* Allocate buffers for descriptor rings and setup queue */
+		ret = em_alloc_rx_queue_mbufs(rxq);
+		if (ret)
+			return ret;
+
+		/*
+		 * Reset crc_len in case it was changed after queue setup by a
+		 *  call to configure
+		 */
+		rxq->crc_len =
+			(uint8_t)(dev->data->dev_conf.rxmode.hw_strip_crc ?
+							0 : ETHER_CRC_LEN);
+
+		bus_addr = rxq->rx_ring_phys_addr;
+		E1000_WRITE_REG(hw, E1000_RDLEN(i),
+				rxq->nb_rx_desc *
+				sizeof(*rxq->rx_ring));
+		E1000_WRITE_REG(hw, E1000_RDBAH(i),
+				(uint32_t)(bus_addr >> 32));
+		E1000_WRITE_REG(hw, E1000_RDBAL(i), (uint32_t)bus_addr);
+
+		E1000_WRITE_REG(hw, E1000_RDH(i), 0);
+		E1000_WRITE_REG(hw, E1000_RDT(i), rxq->nb_rx_desc - 1);
+
+		rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(0));
+		rxdctl &= 0xFE000000;
+		rxdctl |= rxq->pthresh & 0x3F;
+		rxdctl |= (rxq->hthresh & 0x3F) << 8;
+		rxdctl |= (rxq->wthresh & 0x3F) << 16;
+		rxdctl |= E1000_RXDCTL_GRAN;
+		E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl);
+
+		/*
+		 * Due to EM devices not having any sort of hardware
+		 * limit for packet length, jumbo frame of any size
+		 * can be accepted, thus we have to enable scattered
+		 * rx if jumbo frames are enabled (or if buffer size
+		 * is too small to accommodate non-jumbo packets)
+		 * to avoid splitting packets that don't fit into
+		 * one buffer.
+		 */
+		if (dev->data->dev_conf.rxmode.jumbo_frame ||
+				rctl_bsize < ETHER_MAX_LEN) {
+			if (!dev->data->scattered_rx)
+				PMD_INIT_LOG(DEBUG, "forcing scatter mode");
+			dev->rx_pkt_burst =
+				(eth_rx_burst_t)eth_em_recv_scattered_pkts;
+			dev->data->scattered_rx = 1;
+		}
+	}
+
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		if (!dev->data->scattered_rx)
+			PMD_INIT_LOG(DEBUG, "forcing scatter mode");
+		dev->rx_pkt_burst = eth_em_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
+	/*
+	 * Setup the Checksum Register.
+	 * Receive Full-Packet Checksum Offload is mutually exclusive with RSS.
+	 */
+	rxcsum = E1000_READ_REG(hw, E1000_RXCSUM);
+
+	if (dev->data->dev_conf.rxmode.hw_ip_checksum)
+		rxcsum |= E1000_RXCSUM_IPOFL;
+	else
+		rxcsum &= ~E1000_RXCSUM_IPOFL;
+	E1000_WRITE_REG(hw, E1000_RXCSUM, rxcsum);
+
+	/* No MRQ or RSS support for now */
+
+	/* Set early receive threshold on appropriate hw */
+	if ((hw->mac.type == e1000_ich9lan ||
+			hw->mac.type == e1000_pch2lan ||
+			hw->mac.type == e1000_ich10lan) &&
+			dev->data->dev_conf.rxmode.jumbo_frame == 1) {
+		u32 rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(0));
+		E1000_WRITE_REG(hw, E1000_RXDCTL(0), rxdctl | 3);
+		E1000_WRITE_REG(hw, E1000_ERT, 0x100 | (1 << 13));
+	}
+
+	if (hw->mac.type == e1000_pch2lan) {
+		if (dev->data->dev_conf.rxmode.jumbo_frame == 1)
+			e1000_lv_jumbo_workaround_ich8lan(hw, TRUE);
+		else
+			e1000_lv_jumbo_workaround_ich8lan(hw, FALSE);
+	}
+
+	/* Setup the Receive Control Register. */
+	if (dev->data->dev_conf.rxmode.hw_strip_crc)
+		rctl |= E1000_RCTL_SECRC; /* Strip Ethernet CRC. */
+	else
+		rctl &= ~E1000_RCTL_SECRC; /* Do not Strip Ethernet CRC. */
+
+	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
+	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
+		E1000_RCTL_RDMTS_HALF |
+		(hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
+
+	/* Make sure VLAN Filters are off. */
+	rctl &= ~E1000_RCTL_VFE;
+	/* Don't store bad packets. */
+	rctl &= ~E1000_RCTL_SBP;
+	/* Legacy descriptor type. */
+	rctl &= ~E1000_RCTL_DTYP_MASK;
+
+	/*
+	 * Configure support of jumbo frames, if any.
+	 */
+	if (dev->data->dev_conf.rxmode.jumbo_frame == 1)
+		rctl |= E1000_RCTL_LPE;
+	else
+		rctl &= ~E1000_RCTL_LPE;
+
+	/* Enable Receives. */
+	E1000_WRITE_REG(hw, E1000_RCTL, rctl);
+
+	return 0;
+}
+
+/*********************************************************************
+ *
+ *  Enable transmit unit.
+ *
+ **********************************************************************/
+void
+eth_em_tx_init(struct rte_eth_dev *dev)
+{
+	struct e1000_hw     *hw;
+	struct em_tx_queue *txq;
+	uint32_t tctl;
+	uint32_t txdctl;
+	uint16_t i;
+
+	hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/* Setup the Base and Length of the Tx Descriptor Rings. */
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		uint64_t bus_addr;
+
+		txq = dev->data->tx_queues[i];
+		bus_addr = txq->tx_ring_phys_addr;
+		E1000_WRITE_REG(hw, E1000_TDLEN(i),
+				txq->nb_tx_desc *
+				sizeof(*txq->tx_ring));
+		E1000_WRITE_REG(hw, E1000_TDBAH(i),
+				(uint32_t)(bus_addr >> 32));
+		E1000_WRITE_REG(hw, E1000_TDBAL(i), (uint32_t)bus_addr);
+
+		/* Setup the HW Tx Head and Tail descriptor pointers. */
+		E1000_WRITE_REG(hw, E1000_TDT(i), 0);
+		E1000_WRITE_REG(hw, E1000_TDH(i), 0);
+
+		/* Setup Transmit threshold registers. */
+		txdctl = E1000_READ_REG(hw, E1000_TXDCTL(i));
+		/*
+		 * bit 22 is reserved, on some models should always be 0,
+		 * on others  - always 1.
+		 */
+		txdctl &= E1000_TXDCTL_COUNT_DESC;
+		txdctl |= txq->pthresh & 0x3F;
+		txdctl |= (txq->hthresh & 0x3F) << 8;
+		txdctl |= (txq->wthresh & 0x3F) << 16;
+		txdctl |= E1000_TXDCTL_GRAN;
+		E1000_WRITE_REG(hw, E1000_TXDCTL(i), txdctl);
+	}
+
+	/* Program the Transmit Control Register. */
+	tctl = E1000_READ_REG(hw, E1000_TCTL);
+	tctl &= ~E1000_TCTL_CT;
+	tctl |= (E1000_TCTL_PSP | E1000_TCTL_RTLC | E1000_TCTL_EN |
+		 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT));
+
+	/* This write will effectively turn on the transmit unit. */
+	E1000_WRITE_REG(hw, E1000_TCTL, tctl);
+}
+
+void
+em_rxq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,
+	struct rte_eth_rxq_info *qinfo)
+{
+	struct em_rx_queue *rxq;
+
+	rxq = dev->data->rx_queues[queue_id];
+
+	qinfo->mp = rxq->mb_pool;
+	qinfo->scattered_rx = dev->data->scattered_rx;
+	qinfo->nb_desc = rxq->nb_rx_desc;
+	qinfo->conf.rx_free_thresh = rxq->rx_free_thresh;
+}
+
+void
+em_txq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,
+	struct rte_eth_txq_info *qinfo)
+{
+	struct em_tx_queue *txq;
+
+	txq = dev->data->tx_queues[queue_id];
+
+	qinfo->nb_desc = txq->nb_tx_desc;
+
+	qinfo->conf.tx_thresh.pthresh = txq->pthresh;
+	qinfo->conf.tx_thresh.hthresh = txq->hthresh;
+	qinfo->conf.tx_thresh.wthresh = txq->wthresh;
+	qinfo->conf.tx_free_thresh = txq->tx_free_thresh;
+	qinfo->conf.tx_rs_thresh = txq->tx_rs_thresh;
+}