Imported upstream release 16.04

* gbp import-orig ../dpdk-16.04.tar.xz

Change-Id: Iac2196db782ba322f6974d8a752acc34ce5024c3
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

13 files changed, 4681 insertions, 0 deletions

diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
new file mode 100644
index 00000000..ef84f604
--- /dev/null
+++ b/drivers/net/virtio/Makefile
@@ -0,0 +1,63 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 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 $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+LIB = librte_pmd_virtio.a
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+EXPORT_MAP := rte_pmd_virtio_version.map
+
+LIBABIVER := 1
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtqueue.c
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_pci.c
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
+
+ifeq ($(findstring RTE_MACHINE_CPUFLAG_SSSE3,$(CFLAGS)),RTE_MACHINE_CPUFLAG_SSSE3)
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_simple.c
+endif
+
+# this lib depends upon:
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_eal lib/librte_ether
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_mempool lib/librte_mbuf
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_net
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/net/virtio/rte_pmd_virtio_version.map b/drivers/net/virtio/rte_pmd_virtio_version.map
new file mode 100644
index 00000000..ef353984
--- /dev/null
+++ b/drivers/net/virtio/rte_pmd_virtio_version.map
@@ -0,0 +1,4 @@
+DPDK_2.0 {
+
+	local: *;
+};
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
new file mode 100644
index 00000000..63a368ac
--- /dev/null
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -0,0 +1,1461 @@
+/*-
+ *   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 <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <rte_ethdev.h>
+#include <rte_memcpy.h>
+#include <rte_string_fns.h>
+#include <rte_memzone.h>
+#include <rte_malloc.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_pci.h>
+#include <rte_ether.h>
+#include <rte_common.h>
+#include <rte_errno.h>
+
+#include <rte_memory.h>
+#include <rte_eal.h>
+#include <rte_dev.h>
+
+#include "virtio_ethdev.h"
+#include "virtio_pci.h"
+#include "virtio_logs.h"
+#include "virtqueue.h"
+#include "virtio_rxtx.h"
+
+
+static int eth_virtio_dev_init(struct rte_eth_dev *eth_dev);
+static int eth_virtio_dev_uninit(struct rte_eth_dev *eth_dev);
+static int  virtio_dev_configure(struct rte_eth_dev *dev);
+static int  virtio_dev_start(struct rte_eth_dev *dev);
+static void virtio_dev_stop(struct rte_eth_dev *dev);
+static void virtio_dev_promiscuous_enable(struct rte_eth_dev *dev);
+static void virtio_dev_promiscuous_disable(struct rte_eth_dev *dev);
+static void virtio_dev_allmulticast_enable(struct rte_eth_dev *dev);
+static void virtio_dev_allmulticast_disable(struct rte_eth_dev *dev);
+static void virtio_dev_info_get(struct rte_eth_dev *dev,
+				struct rte_eth_dev_info *dev_info);
+static int virtio_dev_link_update(struct rte_eth_dev *dev,
+	__rte_unused int wait_to_complete);
+
+static void virtio_set_hwaddr(struct virtio_hw *hw);
+static void virtio_get_hwaddr(struct virtio_hw *hw);
+
+static void virtio_dev_stats_get(struct rte_eth_dev *dev,
+				 struct rte_eth_stats *stats);
+static int virtio_dev_xstats_get(struct rte_eth_dev *dev,
+				 struct rte_eth_xstats *xstats, unsigned n);
+static void virtio_dev_stats_reset(struct rte_eth_dev *dev);
+static void virtio_dev_free_mbufs(struct rte_eth_dev *dev);
+static int virtio_vlan_filter_set(struct rte_eth_dev *dev,
+				uint16_t vlan_id, int on);
+static void virtio_mac_addr_add(struct rte_eth_dev *dev,
+				struct ether_addr *mac_addr,
+				uint32_t index, uint32_t vmdq __rte_unused);
+static void virtio_mac_addr_remove(struct rte_eth_dev *dev, uint32_t index);
+static void virtio_mac_addr_set(struct rte_eth_dev *dev,
+				struct ether_addr *mac_addr);
+
+static int virtio_dev_queue_stats_mapping_set(
+	__rte_unused struct rte_eth_dev *eth_dev,
+	__rte_unused uint16_t queue_id,
+	__rte_unused uint8_t stat_idx,
+	__rte_unused uint8_t is_rx);
+
+/*
+ * The set of PCI devices this driver supports
+ */
+static const struct rte_pci_id pci_id_virtio_map[] = {
+
+#define RTE_PCI_DEV_ID_DECL_VIRTIO(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
+#include "rte_pci_dev_ids.h"
+
+{ .vendor_id = 0, /* sentinel */ },
+};
+
+struct rte_virtio_xstats_name_off {
+	char name[RTE_ETH_XSTATS_NAME_SIZE];
+	unsigned offset;
+};
+
+/* [rt]x_qX_ is prepended to the name string here */
+static const struct rte_virtio_xstats_name_off rte_virtio_q_stat_strings[] = {
+	{"good_packets",           offsetof(struct virtqueue, packets)},
+	{"good_bytes",             offsetof(struct virtqueue, bytes)},
+	{"errors",                 offsetof(struct virtqueue, errors)},
+	{"multicast_packets",      offsetof(struct virtqueue, multicast)},
+	{"broadcast_packets",      offsetof(struct virtqueue, broadcast)},
+	{"undersize_packets",      offsetof(struct virtqueue, size_bins[0])},
+	{"size_64_packets",        offsetof(struct virtqueue, size_bins[1])},
+	{"size_65_127_packets",    offsetof(struct virtqueue, size_bins[2])},
+	{"size_128_255_packets",   offsetof(struct virtqueue, size_bins[3])},
+	{"size_256_511_packets",   offsetof(struct virtqueue, size_bins[4])},
+	{"size_512_1023_packets",  offsetof(struct virtqueue, size_bins[5])},
+	{"size_1024_1517_packets", offsetof(struct virtqueue, size_bins[6])},
+	{"size_1518_max_packets",  offsetof(struct virtqueue, size_bins[7])},
+};
+
+#define VIRTIO_NB_Q_XSTATS (sizeof(rte_virtio_q_stat_strings) / \
+			    sizeof(rte_virtio_q_stat_strings[0]))
+
+static int
+virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
+		int *dlen, int pkt_num)
+{
+	uint32_t head, i;
+	int k, sum = 0;
+	virtio_net_ctrl_ack status = ~0;
+	struct virtio_pmd_ctrl result;
+
+	ctrl->status = status;
+
+	if (!(vq && vq->hw->cvq)) {
+		PMD_INIT_LOG(ERR, "Control queue is not supported.");
+		return -1;
+	}
+	head = vq->vq_desc_head_idx;
+
+	PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
+		"vq->hw->cvq = %p vq = %p",
+		vq->vq_desc_head_idx, status, vq->hw->cvq, vq);
+
+	if ((vq->vq_free_cnt < ((uint32_t)pkt_num + 2)) || (pkt_num < 1))
+		return -1;
+
+	memcpy(vq->virtio_net_hdr_mz->addr, ctrl,
+		sizeof(struct virtio_pmd_ctrl));
+
+	/*
+	 * Format is enforced in qemu code:
+	 * One TX packet for header;
+	 * At least one TX packet per argument;
+	 * One RX packet for ACK.
+	 */
+	vq->vq_ring.desc[head].flags = VRING_DESC_F_NEXT;
+	vq->vq_ring.desc[head].addr = vq->virtio_net_hdr_mz->phys_addr;
+	vq->vq_ring.desc[head].len = sizeof(struct virtio_net_ctrl_hdr);
+	vq->vq_free_cnt--;
+	i = vq->vq_ring.desc[head].next;
+
+	for (k = 0; k < pkt_num; k++) {
+		vq->vq_ring.desc[i].flags = VRING_DESC_F_NEXT;
+		vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
+			+ sizeof(struct virtio_net_ctrl_hdr)
+			+ sizeof(ctrl->status) + sizeof(uint8_t)*sum;
+		vq->vq_ring.desc[i].len = dlen[k];
+		sum += dlen[k];
+		vq->vq_free_cnt--;
+		i = vq->vq_ring.desc[i].next;
+	}
+
+	vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
+	vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
+			+ sizeof(struct virtio_net_ctrl_hdr);
+	vq->vq_ring.desc[i].len = sizeof(ctrl->status);
+	vq->vq_free_cnt--;
+
+	vq->vq_desc_head_idx = vq->vq_ring.desc[i].next;
+
+	vq_update_avail_ring(vq, head);
+	vq_update_avail_idx(vq);
+
+	PMD_INIT_LOG(DEBUG, "vq->vq_queue_index = %d", vq->vq_queue_index);
+
+	virtqueue_notify(vq);
+
+	rte_rmb();
+	while (vq->vq_used_cons_idx == vq->vq_ring.used->idx) {
+		rte_rmb();
+		usleep(100);
+	}
+
+	while (vq->vq_used_cons_idx != vq->vq_ring.used->idx) {
+		uint32_t idx, desc_idx, used_idx;
+		struct vring_used_elem *uep;
+
+		used_idx = (uint32_t)(vq->vq_used_cons_idx
+				& (vq->vq_nentries - 1));
+		uep = &vq->vq_ring.used->ring[used_idx];
+		idx = (uint32_t) uep->id;
+		desc_idx = idx;
+
+		while (vq->vq_ring.desc[desc_idx].flags & VRING_DESC_F_NEXT) {
+			desc_idx = vq->vq_ring.desc[desc_idx].next;
+			vq->vq_free_cnt++;
+		}
+
+		vq->vq_ring.desc[desc_idx].next = vq->vq_desc_head_idx;
+		vq->vq_desc_head_idx = idx;
+
+		vq->vq_used_cons_idx++;
+		vq->vq_free_cnt++;
+	}
+
+	PMD_INIT_LOG(DEBUG, "vq->vq_free_cnt=%d\nvq->vq_desc_head_idx=%d",
+			vq->vq_free_cnt, vq->vq_desc_head_idx);
+
+	memcpy(&result, vq->virtio_net_hdr_mz->addr,
+			sizeof(struct virtio_pmd_ctrl));
+
+	return result.status;
+}
+
+static int
+virtio_set_multiple_queues(struct rte_eth_dev *dev, uint16_t nb_queues)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
+	memcpy(ctrl.data, &nb_queues, sizeof(uint16_t));
+
+	dlen[0] = sizeof(uint16_t);
+
+	ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
+	if (ret) {
+		PMD_INIT_LOG(ERR, "Multiqueue configured but send command "
+			  "failed, this is too late now...");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+void
+virtio_dev_queue_release(struct virtqueue *vq) {
+	struct virtio_hw *hw;
+
+	if (vq) {
+		hw = vq->hw;
+		hw->vtpci_ops->del_queue(hw, vq);
+
+		rte_free(vq->sw_ring);
+		rte_free(vq);
+	}
+}
+
+int virtio_dev_queue_setup(struct rte_eth_dev *dev,
+			int queue_type,
+			uint16_t queue_idx,
+			uint16_t vtpci_queue_idx,
+			uint16_t nb_desc,
+			unsigned int socket_id,
+			struct virtqueue **pvq)
+{
+	char vq_name[VIRTQUEUE_MAX_NAME_SZ];
+	const struct rte_memzone *mz;
+	unsigned int vq_size, size;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = NULL;
+
+	PMD_INIT_LOG(DEBUG, "setting up queue: %u", vtpci_queue_idx);
+
+	/*
+	 * Read the virtqueue size from the Queue Size field
+	 * Always power of 2 and if 0 virtqueue does not exist
+	 */
+	vq_size = hw->vtpci_ops->get_queue_num(hw, vtpci_queue_idx);
+	PMD_INIT_LOG(DEBUG, "vq_size: %u nb_desc:%u", vq_size, nb_desc);
+	if (vq_size == 0) {
+		PMD_INIT_LOG(ERR, "virtqueue does not exist");
+		return -EINVAL;
+	}
+
+	if (!rte_is_power_of_2(vq_size)) {
+		PMD_INIT_LOG(ERR, "virtqueue size is not powerof 2");
+		return -EINVAL;
+	}
+
+	if (queue_type == VTNET_RQ) {
+		snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d",
+			dev->data->port_id, queue_idx);
+		vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
+			vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
+		vq->sw_ring = rte_zmalloc_socket("rxq->sw_ring",
+			(RTE_PMD_VIRTIO_RX_MAX_BURST + vq_size) *
+			sizeof(vq->sw_ring[0]), RTE_CACHE_LINE_SIZE, socket_id);
+	} else if (queue_type == VTNET_TQ) {
+		snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d",
+			dev->data->port_id, queue_idx);
+		vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
+			vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
+	} else if (queue_type == VTNET_CQ) {
+		snprintf(vq_name, sizeof(vq_name), "port%d_cvq",
+			dev->data->port_id);
+		vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
+			vq_size * sizeof(struct vq_desc_extra),
+			RTE_CACHE_LINE_SIZE);
+	}
+	if (vq == NULL) {
+		PMD_INIT_LOG(ERR, "Can not allocate virtqueue");
+		return -ENOMEM;
+	}
+	if (queue_type == VTNET_RQ && vq->sw_ring == NULL) {
+		PMD_INIT_LOG(ERR, "Can not allocate RX soft ring");
+		rte_free(vq);
+		return -ENOMEM;
+	}
+
+	vq->hw = hw;
+	vq->port_id = dev->data->port_id;
+	vq->queue_id = queue_idx;
+	vq->vq_queue_index = vtpci_queue_idx;
+	vq->vq_nentries = vq_size;
+
+	if (nb_desc == 0 || nb_desc > vq_size)
+		nb_desc = vq_size;
+	vq->vq_free_cnt = nb_desc;
+
+	/*
+	 * Reserve a memzone for vring elements
+	 */
+	size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
+	vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
+	PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
+
+	mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
+		socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
+	if (mz == NULL) {
+		if (rte_errno == EEXIST)
+			mz = rte_memzone_lookup(vq_name);
+		if (mz == NULL) {
+			rte_free(vq);
+			return -ENOMEM;
+		}
+	}
+
+	/*
+	 * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
+	 * and only accepts 32 bit page frame number.
+	 * Check if the allocated physical memory exceeds 16TB.
+	 */
+	if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
+		PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
+		rte_free(vq);
+		return -ENOMEM;
+	}
+
+	memset(mz->addr, 0, sizeof(mz->len));
+	vq->mz = mz;
+	vq->vq_ring_mem = mz->phys_addr;
+	vq->vq_ring_virt_mem = mz->addr;
+	PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
+	PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)(uintptr_t)mz->addr);
+	vq->virtio_net_hdr_mz  = NULL;
+	vq->virtio_net_hdr_mem = 0;
+
+	if (queue_type == VTNET_TQ) {
+		const struct rte_memzone *hdr_mz;
+		struct virtio_tx_region *txr;
+		unsigned int i;
+
+		/*
+		 * For each xmit packet, allocate a virtio_net_hdr
+		 * and indirect ring elements
+		 */
+		snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
+			 dev->data->port_id, queue_idx);
+		hdr_mz = rte_memzone_reserve_aligned(vq_name,
+						     vq_size * sizeof(*txr),
+						     socket_id, 0,
+						     RTE_CACHE_LINE_SIZE);
+		if (hdr_mz == NULL) {
+			if (rte_errno == EEXIST)
+				hdr_mz = rte_memzone_lookup(vq_name);
+			if (hdr_mz == NULL) {
+				rte_free(vq);
+				return -ENOMEM;
+			}
+		}
+		vq->virtio_net_hdr_mz = hdr_mz;
+		vq->virtio_net_hdr_mem = hdr_mz->phys_addr;
+
+		txr = hdr_mz->addr;
+		memset(txr, 0, vq_size * sizeof(*txr));
+		for (i = 0; i < vq_size; i++) {
+			struct vring_desc *start_dp = txr[i].tx_indir;
+
+			vring_desc_init(start_dp, RTE_DIM(txr[i].tx_indir));
+
+			/* first indirect descriptor is always the tx header */
+			start_dp->addr = vq->virtio_net_hdr_mem
+				+ i * sizeof(*txr)
+				+ offsetof(struct virtio_tx_region, tx_hdr);
+
+			start_dp->len = vq->hw->vtnet_hdr_size;
+			start_dp->flags = VRING_DESC_F_NEXT;
+		}
+
+	} else if (queue_type == VTNET_CQ) {
+		/* Allocate a page for control vq command, data and status */
+		snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
+			dev->data->port_id);
+		vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
+			PAGE_SIZE, socket_id, 0, RTE_CACHE_LINE_SIZE);
+		if (vq->virtio_net_hdr_mz == NULL) {
+			if (rte_errno == EEXIST)
+				vq->virtio_net_hdr_mz =
+					rte_memzone_lookup(vq_name);
+			if (vq->virtio_net_hdr_mz == NULL) {
+				rte_free(vq);
+				return -ENOMEM;
+			}
+		}
+		vq->virtio_net_hdr_mem =
+			vq->virtio_net_hdr_mz->phys_addr;
+		memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
+	}
+
+	hw->vtpci_ops->setup_queue(hw, vq);
+
+	*pvq = vq;
+	return 0;
+}
+
+static int
+virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
+		uint32_t socket_id)
+{
+	struct virtqueue *vq;
+	int ret;
+	struct virtio_hw *hw = dev->data->dev_private;
+
+	PMD_INIT_FUNC_TRACE();
+	ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
+			vtpci_queue_idx, 0, socket_id, &vq);
+	if (ret < 0) {
+		PMD_INIT_LOG(ERR, "control vq initialization failed");
+		return ret;
+	}
+
+	hw->cvq = vq;
+	return 0;
+}
+
+static void
+virtio_free_queues(struct rte_eth_dev *dev)
+{
+	unsigned int i;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++)
+		virtio_dev_rx_queue_release(dev->data->rx_queues[i]);
+
+	dev->data->nb_rx_queues = 0;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++)
+		virtio_dev_tx_queue_release(dev->data->tx_queues[i]);
+
+	dev->data->nb_tx_queues = 0;
+}
+
+static void
+virtio_dev_close(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct rte_pci_device *pci_dev = dev->pci_dev;
+
+	PMD_INIT_LOG(DEBUG, "virtio_dev_close");
+
+	if (hw->started == 1)
+		virtio_dev_stop(dev);
+
+	/* reset the NIC */
+	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
+		vtpci_irq_config(hw, VIRTIO_MSI_NO_VECTOR);
+	vtpci_reset(hw);
+	virtio_dev_free_mbufs(dev);
+	virtio_free_queues(dev);
+}
+
+static void
+virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_RX)) {
+		PMD_INIT_LOG(INFO, "host does not support rx control\n");
+		return;
+	}
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
+	ctrl.data[0] = 1;
+	dlen[0] = 1;
+
+	ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
+	if (ret)
+		PMD_INIT_LOG(ERR, "Failed to enable promisc");
+}
+
+static void
+virtio_dev_promiscuous_disable(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_RX)) {
+		PMD_INIT_LOG(INFO, "host does not support rx control\n");
+		return;
+	}
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
+	ctrl.data[0] = 0;
+	dlen[0] = 1;
+
+	ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
+	if (ret)
+		PMD_INIT_LOG(ERR, "Failed to disable promisc");
+}
+
+static void
+virtio_dev_allmulticast_enable(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_RX)) {
+		PMD_INIT_LOG(INFO, "host does not support rx control\n");
+		return;
+	}
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
+	ctrl.data[0] = 1;
+	dlen[0] = 1;
+
+	ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
+	if (ret)
+		PMD_INIT_LOG(ERR, "Failed to enable allmulticast");
+}
+
+static void
+virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_RX)) {
+		PMD_INIT_LOG(INFO, "host does not support rx control\n");
+		return;
+	}
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
+	ctrl.data[0] = 0;
+	dlen[0] = 1;
+
+	ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
+	if (ret)
+		PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
+}
+
+/*
+ * dev_ops for virtio, bare necessities for basic operation
+ */
+static const struct eth_dev_ops virtio_eth_dev_ops = {
+	.dev_configure           = virtio_dev_configure,
+	.dev_start               = virtio_dev_start,
+	.dev_stop                = virtio_dev_stop,
+	.dev_close               = virtio_dev_close,
+	.promiscuous_enable      = virtio_dev_promiscuous_enable,
+	.promiscuous_disable     = virtio_dev_promiscuous_disable,
+	.allmulticast_enable     = virtio_dev_allmulticast_enable,
+	.allmulticast_disable    = virtio_dev_allmulticast_disable,
+
+	.dev_infos_get           = virtio_dev_info_get,
+	.stats_get               = virtio_dev_stats_get,
+	.xstats_get              = virtio_dev_xstats_get,
+	.stats_reset             = virtio_dev_stats_reset,
+	.xstats_reset            = virtio_dev_stats_reset,
+	.link_update             = virtio_dev_link_update,
+	.rx_queue_setup          = virtio_dev_rx_queue_setup,
+	.rx_queue_release        = virtio_dev_rx_queue_release,
+	.tx_queue_setup          = virtio_dev_tx_queue_setup,
+	.tx_queue_release        = virtio_dev_tx_queue_release,
+	/* collect stats per queue */
+	.queue_stats_mapping_set = virtio_dev_queue_stats_mapping_set,
+	.vlan_filter_set         = virtio_vlan_filter_set,
+	.mac_addr_add            = virtio_mac_addr_add,
+	.mac_addr_remove         = virtio_mac_addr_remove,
+	.mac_addr_set            = virtio_mac_addr_set,
+};
+
+static inline int
+virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
+				struct rte_eth_link *link)
+{
+	struct rte_eth_link *dst = link;
+	struct rte_eth_link *src = &(dev->data->dev_link);
+
+	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
+			*(uint64_t *)src) == 0)
+		return -1;
+
+	return 0;
+}
+
+/**
+ * Atomically writes the link status information into global
+ * structure rte_eth_dev.
+ *
+ * @param dev
+ *   - Pointer to the structure rte_eth_dev to read from.
+ *   - Pointer to the buffer to be saved with the link status.
+ *
+ * @return
+ *   - On success, zero.
+ *   - On failure, negative value.
+ */
+static inline int
+virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
+		struct rte_eth_link *link)
+{
+	struct rte_eth_link *dst = &(dev->data->dev_link);
+	struct rte_eth_link *src = link;
+
+	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
+					*(uint64_t *)src) == 0)
+		return -1;
+
+	return 0;
+}
+
+static void
+virtio_update_stats(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
+{
+	unsigned i;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		const struct virtqueue *txvq = dev->data->tx_queues[i];
+		if (txvq == NULL)
+			continue;
+
+		stats->opackets += txvq->packets;
+		stats->obytes += txvq->bytes;
+		stats->oerrors += txvq->errors;
+
+		if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
+			stats->q_opackets[i] = txvq->packets;
+			stats->q_obytes[i] = txvq->bytes;
+		}
+	}
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		const struct virtqueue *rxvq = dev->data->rx_queues[i];
+		if (rxvq == NULL)
+			continue;
+
+		stats->ipackets += rxvq->packets;
+		stats->ibytes += rxvq->bytes;
+		stats->ierrors += rxvq->errors;
+
+		if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
+			stats->q_ipackets[i] = rxvq->packets;
+			stats->q_ibytes[i] = rxvq->bytes;
+		}
+	}
+
+	stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
+}
+
+static int
+virtio_dev_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstats *xstats,
+		      unsigned n)
+{
+	unsigned i;
+	unsigned count = 0;
+
+	unsigned nstats = dev->data->nb_tx_queues * VIRTIO_NB_Q_XSTATS +
+		dev->data->nb_rx_queues * VIRTIO_NB_Q_XSTATS;
+
+	if (n < nstats)
+		return nstats;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		struct virtqueue *rxvq = dev->data->rx_queues[i];
+
+		if (rxvq == NULL)
+			continue;
+
+		unsigned t;
+
+		for (t = 0; t < VIRTIO_NB_Q_XSTATS; t++) {
+			snprintf(xstats[count].name, sizeof(xstats[count].name),
+				 "rx_q%u_%s", i,
+				 rte_virtio_q_stat_strings[t].name);
+			xstats[count].value = *(uint64_t *)(((char *)rxvq) +
+				rte_virtio_q_stat_strings[t].offset);
+			count++;
+		}
+	}
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		struct virtqueue *txvq = dev->data->tx_queues[i];
+
+		if (txvq == NULL)
+			continue;
+
+		unsigned t;
+
+		for (t = 0; t < VIRTIO_NB_Q_XSTATS; t++) {
+			snprintf(xstats[count].name, sizeof(xstats[count].name),
+				 "tx_q%u_%s", i,
+				 rte_virtio_q_stat_strings[t].name);
+			xstats[count].value = *(uint64_t *)(((char *)txvq) +
+				rte_virtio_q_stat_strings[t].offset);
+			count++;
+		}
+	}
+
+	return count;
+}
+
+static void
+virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
+{
+	virtio_update_stats(dev, stats);
+}
+
+static void
+virtio_dev_stats_reset(struct rte_eth_dev *dev)
+{
+	unsigned int i;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		struct virtqueue *txvq = dev->data->tx_queues[i];
+		if (txvq == NULL)
+			continue;
+
+		txvq->packets = 0;
+		txvq->bytes = 0;
+		txvq->errors = 0;
+		txvq->multicast = 0;
+		txvq->broadcast = 0;
+		memset(txvq->size_bins, 0, sizeof(txvq->size_bins[0]) * 8);
+	}
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		struct virtqueue *rxvq = dev->data->rx_queues[i];
+		if (rxvq == NULL)
+			continue;
+
+		rxvq->packets = 0;
+		rxvq->bytes = 0;
+		rxvq->errors = 0;
+		rxvq->multicast = 0;
+		rxvq->broadcast = 0;
+		memset(rxvq->size_bins, 0, sizeof(rxvq->size_bins[0]) * 8);
+	}
+}
+
+static void
+virtio_set_hwaddr(struct virtio_hw *hw)
+{
+	vtpci_write_dev_config(hw,
+			offsetof(struct virtio_net_config, mac),
+			&hw->mac_addr, ETHER_ADDR_LEN);
+}
+
+static void
+virtio_get_hwaddr(struct virtio_hw *hw)
+{
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
+		vtpci_read_dev_config(hw,
+			offsetof(struct virtio_net_config, mac),
+			&hw->mac_addr, ETHER_ADDR_LEN);
+	} else {
+		eth_random_addr(&hw->mac_addr[0]);
+		virtio_set_hwaddr(hw);
+	}
+}
+
+static void
+virtio_mac_table_set(struct virtio_hw *hw,
+		     const struct virtio_net_ctrl_mac *uc,
+		     const struct virtio_net_ctrl_mac *mc)
+{
+	struct virtio_pmd_ctrl ctrl;
+	int err, len[2];
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
+		PMD_DRV_LOG(INFO, "host does not support mac table\n");
+		return;
+	}
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_MAC;
+	ctrl.hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
+
+	len[0] = uc->entries * ETHER_ADDR_LEN + sizeof(uc->entries);
+	memcpy(ctrl.data, uc, len[0]);
+
+	len[1] = mc->entries * ETHER_ADDR_LEN + sizeof(mc->entries);
+	memcpy(ctrl.data + len[0], mc, len[1]);
+
+	err = virtio_send_command(hw->cvq, &ctrl, len, 2);
+	if (err != 0)
+		PMD_DRV_LOG(NOTICE, "mac table set failed: %d", err);
+}
+
+static void
+virtio_mac_addr_add(struct rte_eth_dev *dev, struct ether_addr *mac_addr,
+		    uint32_t index, uint32_t vmdq __rte_unused)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	const struct ether_addr *addrs = dev->data->mac_addrs;
+	unsigned int i;
+	struct virtio_net_ctrl_mac *uc, *mc;
+
+	if (index >= VIRTIO_MAX_MAC_ADDRS) {
+		PMD_DRV_LOG(ERR, "mac address index %u out of range", index);
+		return;
+	}
+
+	uc = alloca(VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN + sizeof(uc->entries));
+	uc->entries = 0;
+	mc = alloca(VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN + sizeof(mc->entries));
+	mc->entries = 0;
+
+	for (i = 0; i < VIRTIO_MAX_MAC_ADDRS; i++) {
+		const struct ether_addr *addr
+			= (i == index) ? mac_addr : addrs + i;
+		struct virtio_net_ctrl_mac *tbl
+			= is_multicast_ether_addr(addr) ? mc : uc;
+
+		memcpy(&tbl->macs[tbl->entries++], addr, ETHER_ADDR_LEN);
+	}
+
+	virtio_mac_table_set(hw, uc, mc);
+}
+
+static void
+virtio_mac_addr_remove(struct rte_eth_dev *dev, uint32_t index)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct ether_addr *addrs = dev->data->mac_addrs;
+	struct virtio_net_ctrl_mac *uc, *mc;
+	unsigned int i;
+
+	if (index >= VIRTIO_MAX_MAC_ADDRS) {
+		PMD_DRV_LOG(ERR, "mac address index %u out of range", index);
+		return;
+	}
+
+	uc = alloca(VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN + sizeof(uc->entries));
+	uc->entries = 0;
+	mc = alloca(VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN + sizeof(mc->entries));
+	mc->entries = 0;
+
+	for (i = 0; i < VIRTIO_MAX_MAC_ADDRS; i++) {
+		struct virtio_net_ctrl_mac *tbl;
+
+		if (i == index || is_zero_ether_addr(addrs + i))
+			continue;
+
+		tbl = is_multicast_ether_addr(addrs + i) ? mc : uc;
+		memcpy(&tbl->macs[tbl->entries++], addrs + i, ETHER_ADDR_LEN);
+	}
+
+	virtio_mac_table_set(hw, uc, mc);
+}
+
+static void
+virtio_mac_addr_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+
+	memcpy(hw->mac_addr, mac_addr, ETHER_ADDR_LEN);
+
+	/* Use atomic update if available */
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
+		struct virtio_pmd_ctrl ctrl;
+		int len = ETHER_ADDR_LEN;
+
+		ctrl.hdr.class = VIRTIO_NET_CTRL_MAC;
+		ctrl.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
+
+		memcpy(ctrl.data, mac_addr, ETHER_ADDR_LEN);
+		virtio_send_command(hw->cvq, &ctrl, &len, 1);
+	} else if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC))
+		virtio_set_hwaddr(hw);
+}
+
+static int
+virtio_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtio_pmd_ctrl ctrl;
+	int len;
+
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VLAN))
+		return -ENOTSUP;
+
+	ctrl.hdr.class = VIRTIO_NET_CTRL_VLAN;
+	ctrl.hdr.cmd = on ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
+	memcpy(ctrl.data, &vlan_id, sizeof(vlan_id));
+	len = sizeof(vlan_id);
+
+	return virtio_send_command(hw->cvq, &ctrl, &len, 1);
+}
+
+static int
+virtio_negotiate_features(struct virtio_hw *hw)
+{
+	uint64_t host_features;
+
+	/* Prepare guest_features: feature that driver wants to support */
+	hw->guest_features = VIRTIO_PMD_GUEST_FEATURES;
+	PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %" PRIx64,
+		hw->guest_features);
+
+	/* Read device(host) feature bits */
+	host_features = hw->vtpci_ops->get_features(hw);
+	PMD_INIT_LOG(DEBUG, "host_features before negotiate = %" PRIx64,
+		host_features);
+
+	/*
+	 * Negotiate features: Subset of device feature bits are written back
+	 * guest feature bits.
+	 */
+	hw->guest_features = vtpci_negotiate_features(hw, host_features);
+	PMD_INIT_LOG(DEBUG, "features after negotiate = %" PRIx64,
+		hw->guest_features);
+
+	if (hw->modern) {
+		if (!vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) {
+			PMD_INIT_LOG(ERR,
+				"VIRTIO_F_VERSION_1 features is not enabled.");
+			return -1;
+		}
+		vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_FEATURES_OK);
+		if (!(vtpci_get_status(hw) & VIRTIO_CONFIG_STATUS_FEATURES_OK)) {
+			PMD_INIT_LOG(ERR,
+				"failed to set FEATURES_OK status!");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Process Virtio Config changed interrupt and call the callback
+ * if link state changed.
+ */
+static void
+virtio_interrupt_handler(__rte_unused struct rte_intr_handle *handle,
+			 void *param)
+{
+	struct rte_eth_dev *dev = param;
+	struct virtio_hw *hw = dev->data->dev_private;
+	uint8_t isr;
+
+	/* Read interrupt status which clears interrupt */
+	isr = vtpci_isr(hw);
+	PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
+
+	if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0)
+		PMD_DRV_LOG(ERR, "interrupt enable failed");
+
+	if (isr & VIRTIO_PCI_ISR_CONFIG) {
+		if (virtio_dev_link_update(dev, 0) == 0)
+			_rte_eth_dev_callback_process(dev,
+						      RTE_ETH_EVENT_INTR_LSC);
+	}
+
+}
+
+static void
+rx_func_get(struct rte_eth_dev *eth_dev)
+{
+	struct virtio_hw *hw = eth_dev->data->dev_private;
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF))
+		eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
+	else
+		eth_dev->rx_pkt_burst = &virtio_recv_pkts;
+}
+
+/*
+ * This function is based on probe() function in virtio_pci.c
+ * It returns 0 on success.
+ */
+static int
+eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
+{
+	struct virtio_hw *hw = eth_dev->data->dev_private;
+	struct virtio_net_config *config;
+	struct virtio_net_config local_config;
+	struct rte_pci_device *pci_dev;
+	int ret;
+
+	RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr));
+
+	eth_dev->dev_ops = &virtio_eth_dev_ops;
+	eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
+
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+		rx_func_get(eth_dev);
+		return 0;
+	}
+
+	/* Allocate memory for storing MAC addresses */
+	eth_dev->data->mac_addrs = rte_zmalloc("virtio", VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN, 0);
+	if (eth_dev->data->mac_addrs == NULL) {
+		PMD_INIT_LOG(ERR,
+			"Failed to allocate %d bytes needed to store MAC addresses",
+			VIRTIO_MAX_MAC_ADDRS * ETHER_ADDR_LEN);
+		return -ENOMEM;
+	}
+
+	pci_dev = eth_dev->pci_dev;
+
+	ret = vtpci_init(pci_dev, hw);
+	if (ret)
+		return ret;
+
+	/* Reset the device although not necessary at startup */
+	vtpci_reset(hw);
+
+	/* Tell the host we've noticed this device. */
+	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
+
+	/* Tell the host we've known how to drive the device. */
+	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
+	if (virtio_negotiate_features(hw) < 0)
+		return -1;
+
+	/* If host does not support status then disable LSC */
+	if (!vtpci_with_feature(hw, VIRTIO_NET_F_STATUS))
+		pci_dev->driver->drv_flags &= ~RTE_PCI_DRV_INTR_LSC;
+
+	rte_eth_copy_pci_info(eth_dev, pci_dev);
+
+	rx_func_get(eth_dev);
+
+	/* Setting up rx_header size for the device */
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF) ||
+	    vtpci_with_feature(hw, VIRTIO_F_VERSION_1))
+		hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	else
+		hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
+
+	/* Copy the permanent MAC address to: virtio_hw */
+	virtio_get_hwaddr(hw);
+	ether_addr_copy((struct ether_addr *) hw->mac_addr,
+			&eth_dev->data->mac_addrs[0]);
+	PMD_INIT_LOG(DEBUG,
+		     "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
+		     hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
+		     hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
+
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
+		config = &local_config;
+
+		vtpci_read_dev_config(hw,
+			offsetof(struct virtio_net_config, mac),
+			&config->mac, sizeof(config->mac));
+
+		if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+			vtpci_read_dev_config(hw,
+				offsetof(struct virtio_net_config, status),
+				&config->status, sizeof(config->status));
+		} else {
+			PMD_INIT_LOG(DEBUG,
+				     "VIRTIO_NET_F_STATUS is not supported");
+			config->status = 0;
+		}
+
+		if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
+			vtpci_read_dev_config(hw,
+				offsetof(struct virtio_net_config, max_virtqueue_pairs),
+				&config->max_virtqueue_pairs,
+				sizeof(config->max_virtqueue_pairs));
+		} else {
+			PMD_INIT_LOG(DEBUG,
+				     "VIRTIO_NET_F_MQ is not supported");
+			config->max_virtqueue_pairs = 1;
+		}
+
+		hw->max_rx_queues =
+			(VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
+			VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
+		hw->max_tx_queues =
+			(VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
+			VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
+
+		virtio_dev_cq_queue_setup(eth_dev,
+					config->max_virtqueue_pairs * 2,
+					SOCKET_ID_ANY);
+
+		PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
+				config->max_virtqueue_pairs);
+		PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
+		PMD_INIT_LOG(DEBUG,
+				"PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
+				config->mac[0], config->mac[1],
+				config->mac[2], config->mac[3],
+				config->mac[4], config->mac[5]);
+	} else {
+		hw->max_rx_queues = 1;
+		hw->max_tx_queues = 1;
+	}
+
+	PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
+			hw->max_rx_queues, hw->max_tx_queues);
+	PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
+			eth_dev->data->port_id, pci_dev->id.vendor_id,
+			pci_dev->id.device_id);
+
+	/* Setup interrupt callback  */
+	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
+		rte_intr_callback_register(&pci_dev->intr_handle,
+				   virtio_interrupt_handler, eth_dev);
+
+	virtio_dev_cq_start(eth_dev);
+
+	return 0;
+}
+
+static int
+eth_virtio_dev_uninit(struct rte_eth_dev *eth_dev)
+{
+	struct rte_pci_device *pci_dev;
+	struct virtio_hw *hw = eth_dev->data->dev_private;
+
+	PMD_INIT_FUNC_TRACE();
+
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+		return -EPERM;
+
+	/* Close it anyway since there's no way to know if closed */
+	virtio_dev_close(eth_dev);
+
+	pci_dev = eth_dev->pci_dev;
+
+	eth_dev->dev_ops = NULL;
+	eth_dev->tx_pkt_burst = NULL;
+	eth_dev->rx_pkt_burst = NULL;
+
+	virtio_dev_queue_release(hw->cvq);
+
+	rte_free(eth_dev->data->mac_addrs);
+	eth_dev->data->mac_addrs = NULL;
+
+	/* reset interrupt callback  */
+	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
+		rte_intr_callback_unregister(&pci_dev->intr_handle,
+						virtio_interrupt_handler,
+						eth_dev);
+	rte_eal_pci_unmap_device(pci_dev);
+
+	PMD_INIT_LOG(DEBUG, "dev_uninit completed");
+
+	return 0;
+}
+
+static struct eth_driver rte_virtio_pmd = {
+	.pci_drv = {
+		.name = "rte_virtio_pmd",
+		.id_table = pci_id_virtio_map,
+		.drv_flags = RTE_PCI_DRV_DETACHABLE,
+	},
+	.eth_dev_init = eth_virtio_dev_init,
+	.eth_dev_uninit = eth_virtio_dev_uninit,
+	.dev_private_size = sizeof(struct virtio_hw),
+};
+
+/*
+ * Driver initialization routine.
+ * Invoked once at EAL init time.
+ * Register itself as the [Poll Mode] Driver of PCI virtio devices.
+ * Returns 0 on success.
+ */
+static int
+rte_virtio_pmd_init(const char *name __rte_unused,
+		    const char *param __rte_unused)
+{
+	if (rte_eal_iopl_init() != 0) {
+		PMD_INIT_LOG(ERR, "IOPL call failed - cannot use virtio PMD");
+		return -1;
+	}
+
+	rte_eth_driver_register(&rte_virtio_pmd);
+	return 0;
+}
+
+/*
+ * Configure virtio device
+ * It returns 0 on success.
+ */
+static int
+virtio_dev_configure(struct rte_eth_dev *dev)
+{
+	const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct rte_pci_device *pci_dev = dev->pci_dev;
+
+	PMD_INIT_LOG(DEBUG, "configure");
+
+	if (rxmode->hw_ip_checksum) {
+		PMD_DRV_LOG(ERR, "HW IP checksum not supported");
+		return -EINVAL;
+	}
+
+	hw->vlan_strip = rxmode->hw_vlan_strip;
+
+	if (rxmode->hw_vlan_filter
+	    && !vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VLAN)) {
+		PMD_DRV_LOG(NOTICE,
+			    "vlan filtering not available on this host");
+		return -ENOTSUP;
+	}
+
+	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
+		if (vtpci_irq_config(hw, 0) == VIRTIO_MSI_NO_VECTOR) {
+			PMD_DRV_LOG(ERR, "failed to set config vector");
+			return -EBUSY;
+		}
+
+	return 0;
+}
+
+
+static int
+virtio_dev_start(struct rte_eth_dev *dev)
+{
+	uint16_t nb_queues, i;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct rte_pci_device *pci_dev = dev->pci_dev;
+
+	/* check if lsc interrupt feature is enabled */
+	if (dev->data->dev_conf.intr_conf.lsc) {
+		if (!(pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)) {
+			PMD_DRV_LOG(ERR, "link status not supported by host");
+			return -ENOTSUP;
+		}
+
+		if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0) {
+			PMD_DRV_LOG(ERR, "interrupt enable failed");
+			return -EIO;
+		}
+	}
+
+	/* Initialize Link state */
+	virtio_dev_link_update(dev, 0);
+
+	/* On restart after stop do not touch queues */
+	if (hw->started)
+		return 0;
+
+	/* Do final configuration before rx/tx engine starts */
+	virtio_dev_rxtx_start(dev);
+	vtpci_reinit_complete(hw);
+
+	hw->started = 1;
+
+	/*Notify the backend
+	 *Otherwise the tap backend might already stop its queue due to fullness.
+	 *vhost backend will have no chance to be waked up
+	 */
+	nb_queues = dev->data->nb_rx_queues;
+	if (nb_queues > 1) {
+		if (virtio_set_multiple_queues(dev, nb_queues) != 0)
+			return -EINVAL;
+	}
+
+	PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
+
+	for (i = 0; i < nb_queues; i++)
+		virtqueue_notify(dev->data->rx_queues[i]);
+
+	PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++)
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++)
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
+
+	return 0;
+}
+
+static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
+{
+	struct rte_mbuf *buf;
+	int i, mbuf_num = 0;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		PMD_INIT_LOG(DEBUG,
+			     "Before freeing rxq[%d] used and unused buf", i);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
+
+		PMD_INIT_LOG(DEBUG, "rx_queues[%d]=%p",
+				i, dev->data->rx_queues[i]);
+		while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
+					dev->data->rx_queues[i])) != NULL) {
+			rte_pktmbuf_free(buf);
+			mbuf_num++;
+		}
+
+		PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
+		PMD_INIT_LOG(DEBUG,
+			     "After freeing rxq[%d] used and unused buf", i);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
+	}
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		PMD_INIT_LOG(DEBUG,
+			     "Before freeing txq[%d] used and unused bufs",
+			     i);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
+
+		mbuf_num = 0;
+		while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
+					dev->data->tx_queues[i])) != NULL) {
+			rte_pktmbuf_free(buf);
+
+			mbuf_num++;
+		}
+
+		PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
+		PMD_INIT_LOG(DEBUG,
+			     "After freeing txq[%d] used and unused buf", i);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
+	}
+}
+
+/*
+ * Stop device: disable interrupt and mark link down
+ */
+static void
+virtio_dev_stop(struct rte_eth_dev *dev)
+{
+	struct rte_eth_link link;
+	struct virtio_hw *hw = dev->data->dev_private;
+
+	PMD_INIT_LOG(DEBUG, "stop");
+
+	hw->started = 0;
+
+	if (dev->data->dev_conf.intr_conf.lsc)
+		rte_intr_disable(&dev->pci_dev->intr_handle);
+
+	memset(&link, 0, sizeof(link));
+	virtio_dev_atomic_write_link_status(dev, &link);
+}
+
+static int
+virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
+{
+	struct rte_eth_link link, old;
+	uint16_t status;
+	struct virtio_hw *hw = dev->data->dev_private;
+	memset(&link, 0, sizeof(link));
+	virtio_dev_atomic_read_link_status(dev, &link);
+	old = link;
+	link.link_duplex = ETH_LINK_FULL_DUPLEX;
+	link.link_speed  = SPEED_10G;
+
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+		PMD_INIT_LOG(DEBUG, "Get link status from hw");
+		vtpci_read_dev_config(hw,
+				offsetof(struct virtio_net_config, status),
+				&status, sizeof(status));
+		if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
+			link.link_status = ETH_LINK_DOWN;
+			PMD_INIT_LOG(DEBUG, "Port %d is down",
+				     dev->data->port_id);
+		} else {
+			link.link_status = ETH_LINK_UP;
+			PMD_INIT_LOG(DEBUG, "Port %d is up",
+				     dev->data->port_id);
+		}
+	} else {
+		link.link_status = ETH_LINK_UP;
+	}
+	virtio_dev_atomic_write_link_status(dev, &link);
+
+	return (old.link_status == link.link_status) ? -1 : 0;
+}
+
+static void
+virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+
+	dev_info->driver_name = dev->driver->pci_drv.name;
+	dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
+	dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
+	dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
+	dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
+	dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
+	dev_info->default_txconf = (struct rte_eth_txconf) {
+		.txq_flags = ETH_TXQ_FLAGS_NOOFFLOADS
+	};
+}
+
+/*
+ * It enables testpmd to collect per queue stats.
+ */
+static int
+virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
+__rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
+__rte_unused uint8_t is_rx)
+{
+	return 0;
+}
+
+static struct rte_driver rte_virtio_driver = {
+	.type = PMD_PDEV,
+	.init = rte_virtio_pmd_init,
+};
+
+PMD_REGISTER_DRIVER(rte_virtio_driver);
diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
new file mode 100644
index 00000000..66423a07
--- /dev/null
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -0,0 +1,125 @@
+/*-
+ *   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.
+ */
+
+#ifndef _VIRTIO_ETHDEV_H_
+#define _VIRTIO_ETHDEV_H_
+
+#include <stdint.h>
+
+#include "virtio_pci.h"
+
+#define SPEED_10	10
+#define SPEED_100	100
+#define SPEED_1000	1000
+#define SPEED_10G	10000
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+#define VIRTIO_MAX_RX_QUEUES 128
+#define VIRTIO_MAX_TX_QUEUES 128
+#define VIRTIO_MAX_MAC_ADDRS 64
+#define VIRTIO_MIN_RX_BUFSIZE 64
+#define VIRTIO_MAX_RX_PKTLEN  9728
+
+/* Features desired/implemented by this driver. */
+#define VIRTIO_PMD_GUEST_FEATURES		\
+	(1u << VIRTIO_NET_F_MAC		  |	\
+	 1u << VIRTIO_NET_F_STATUS	  |	\
+	 1u << VIRTIO_NET_F_MQ		  |	\
+	 1u << VIRTIO_NET_F_CTRL_MAC_ADDR |	\
+	 1u << VIRTIO_NET_F_CTRL_VQ	  |	\
+	 1u << VIRTIO_NET_F_CTRL_RX	  |	\
+	 1u << VIRTIO_NET_F_CTRL_VLAN	  |	\
+	 1u << VIRTIO_NET_F_MRG_RXBUF	  |	\
+	 1ULL << VIRTIO_F_VERSION_1)
+
+/*
+ * CQ function prototype
+ */
+void virtio_dev_cq_start(struct rte_eth_dev *dev);
+
+/*
+ * RX/TX function prototypes
+ */
+void virtio_dev_rxtx_start(struct rte_eth_dev *dev);
+
+int virtio_dev_queue_setup(struct rte_eth_dev *dev,
+			int queue_type,
+			uint16_t queue_idx,
+			uint16_t vtpci_queue_idx,
+			uint16_t nb_desc,
+			unsigned int socket_id,
+			struct virtqueue **pvq);
+
+void virtio_dev_queue_release(struct virtqueue *vq);
+
+int  virtio_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);
+
+void virtio_dev_rx_queue_release(void *rxq);
+
+int  virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
+		uint16_t nb_tx_desc, unsigned int socket_id,
+		const struct rte_eth_txconf *tx_conf);
+
+void virtio_dev_tx_queue_release(void *txq);
+
+uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts);
+
+uint16_t virtio_recv_mergeable_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts);
+
+uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+		uint16_t nb_pkts);
+
+uint16_t virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts);
+
+uint16_t virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
+		uint16_t nb_pkts);
+
+/*
+ * The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us
+ * frames larger than 1514 bytes. We do not yet support software LRO
+ * via tcp_lro_rx().
+ */
+#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
+			    VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
+
+
+#endif /* _VIRTIO_ETHDEV_H_ */
diff --git a/drivers/net/virtio/virtio_logs.h b/drivers/net/virtio/virtio_logs.h
new file mode 100644
index 00000000..d6c33f7b
--- /dev/null
+++ b/drivers/net/virtio/virtio_logs.h
@@ -0,0 +1,70 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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.
+ */
+
+#ifndef _VIRTIO_LOGS_H_
+#define _VIRTIO_LOGS_H_
+
+#include <rte_log.h>
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_INIT
+#define PMD_INIT_LOG(level, fmt, args...) \
+	RTE_LOG(level, PMD, "%s(): " fmt "\n", __func__, ## args)
+#define PMD_INIT_FUNC_TRACE() PMD_INIT_LOG(DEBUG, " >>")
+#else
+#define PMD_INIT_LOG(level, fmt, args...) do { } while(0)
+#define PMD_INIT_FUNC_TRACE() do { } while(0)
+#endif
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_RX
+#define PMD_RX_LOG(level, fmt, args...) \
+	RTE_LOG(level, PMD, "%s() rx: " fmt , __func__, ## args)
+#else
+#define PMD_RX_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_TX
+#define PMD_TX_LOG(level, fmt, args...) \
+	RTE_LOG(level, PMD, "%s() tx: " fmt , __func__, ## args)
+#else
+#define PMD_TX_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DRIVER
+#define PMD_DRV_LOG(level, fmt, args...) \
+	RTE_LOG(level, PMD, "%s(): " fmt , __func__, ## args)
+#else
+#define PMD_DRV_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+#endif /* _VIRTIO_LOGS_H_ */
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
new file mode 100644
index 00000000..c007959f
--- /dev/null
+++ b/drivers/net/virtio/virtio_pci.c
@@ -0,0 +1,666 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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 <stdint.h>
+
+#ifdef RTE_EXEC_ENV_LINUXAPP
+ #include <dirent.h>
+ #include <fcntl.h>
+#endif
+
+#include "virtio_pci.h"
+#include "virtio_logs.h"
+#include "virtqueue.h"
+
+/*
+ * Following macros are derived from linux/pci_regs.h, however,
+ * we can't simply include that header here, as there is no such
+ * file for non-Linux platform.
+ */
+#define PCI_CAPABILITY_LIST	0x34
+#define PCI_CAP_ID_VNDR		0x09
+
+/*
+ * The remaining space is defined by each driver as the per-driver
+ * configuration space.
+ */
+#define VIRTIO_PCI_CONFIG(hw) (((hw)->use_msix) ? 24 : 20)
+
+static void
+legacy_read_dev_config(struct virtio_hw *hw, size_t offset,
+		       void *dst, int length)
+{
+	rte_eal_pci_ioport_read(&hw->io, dst, length,
+				VIRTIO_PCI_CONFIG(hw) + offset);
+}
+
+static void
+legacy_write_dev_config(struct virtio_hw *hw, size_t offset,
+			const void *src, int length)
+{
+	rte_eal_pci_ioport_write(&hw->io, src, length,
+				 VIRTIO_PCI_CONFIG(hw) + offset);
+}
+
+static uint64_t
+legacy_get_features(struct virtio_hw *hw)
+{
+	uint32_t dst;
+
+	rte_eal_pci_ioport_read(&hw->io, &dst, 4, VIRTIO_PCI_HOST_FEATURES);
+	return dst;
+}
+
+static void
+legacy_set_features(struct virtio_hw *hw, uint64_t features)
+{
+	if ((features >> 32) != 0) {
+		PMD_DRV_LOG(ERR,
+			"only 32 bit features are allowed for legacy virtio!");
+		return;
+	}
+	rte_eal_pci_ioport_write(&hw->io, &features, 4,
+				 VIRTIO_PCI_GUEST_FEATURES);
+}
+
+static uint8_t
+legacy_get_status(struct virtio_hw *hw)
+{
+	uint8_t dst;
+
+	rte_eal_pci_ioport_read(&hw->io, &dst, 1, VIRTIO_PCI_STATUS);
+	return dst;
+}
+
+static void
+legacy_set_status(struct virtio_hw *hw, uint8_t status)
+{
+	rte_eal_pci_ioport_write(&hw->io, &status, 1, VIRTIO_PCI_STATUS);
+}
+
+static void
+legacy_reset(struct virtio_hw *hw)
+{
+	legacy_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
+}
+
+static uint8_t
+legacy_get_isr(struct virtio_hw *hw)
+{
+	uint8_t dst;
+
+	rte_eal_pci_ioport_read(&hw->io, &dst, 1, VIRTIO_PCI_ISR);
+	return dst;
+}
+
+/* Enable one vector (0) for Link State Intrerrupt */
+static uint16_t
+legacy_set_config_irq(struct virtio_hw *hw, uint16_t vec)
+{
+	uint16_t dst;
+
+	rte_eal_pci_ioport_write(&hw->io, &vec, 2, VIRTIO_MSI_CONFIG_VECTOR);
+	rte_eal_pci_ioport_read(&hw->io, &dst, 2, VIRTIO_MSI_CONFIG_VECTOR);
+	return dst;
+}
+
+static uint16_t
+legacy_get_queue_num(struct virtio_hw *hw, uint16_t queue_id)
+{
+	uint16_t dst;
+
+	rte_eal_pci_ioport_write(&hw->io, &queue_id, 2, VIRTIO_PCI_QUEUE_SEL);
+	rte_eal_pci_ioport_read(&hw->io, &dst, 2, VIRTIO_PCI_QUEUE_NUM);
+	return dst;
+}
+
+static void
+legacy_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+	uint32_t src;
+
+	rte_eal_pci_ioport_write(&hw->io, &vq->vq_queue_index, 2,
+			 VIRTIO_PCI_QUEUE_SEL);
+	src = vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
+	rte_eal_pci_ioport_write(&hw->io, &src, 4, VIRTIO_PCI_QUEUE_PFN);
+}
+
+static void
+legacy_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+	uint32_t src = 0;
+
+	rte_eal_pci_ioport_write(&hw->io, &vq->vq_queue_index, 2,
+			 VIRTIO_PCI_QUEUE_SEL);
+	rte_eal_pci_ioport_write(&hw->io, &src, 4, VIRTIO_PCI_QUEUE_PFN);
+}
+
+static void
+legacy_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+	rte_eal_pci_ioport_write(&hw->io, &vq->vq_queue_index, 2,
+			 VIRTIO_PCI_QUEUE_NOTIFY);
+}
+
+#ifdef RTE_EXEC_ENV_LINUXAPP
+static int
+legacy_virtio_has_msix(const struct rte_pci_addr *loc)
+{
+	DIR *d;
+	char dirname[PATH_MAX];
+
+	snprintf(dirname, sizeof(dirname),
+		     SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
+		     loc->domain, loc->bus, loc->devid, loc->function);
+
+	d = opendir(dirname);
+	if (d)
+		closedir(d);
+
+	return d != NULL;
+}
+#else
+static int
+legacy_virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
+{
+	/* nic_uio does not enable interrupts, return 0 (false). */
+	return 0;
+}
+#endif
+
+static int
+legacy_virtio_resource_init(struct rte_pci_device *pci_dev,
+			    struct virtio_hw *hw)
+{
+	if (rte_eal_pci_ioport_map(pci_dev, 0, &hw->io) < 0)
+		return -1;
+
+	if (pci_dev->intr_handle.type != RTE_INTR_HANDLE_UNKNOWN)
+		pci_dev->driver->drv_flags |= RTE_PCI_DRV_INTR_LSC;
+	else
+		pci_dev->driver->drv_flags &= ~RTE_PCI_DRV_INTR_LSC;
+
+	return 0;
+}
+
+static const struct virtio_pci_ops legacy_ops = {
+	.read_dev_cfg	= legacy_read_dev_config,
+	.write_dev_cfg	= legacy_write_dev_config,
+	.reset		= legacy_reset,
+	.get_status	= legacy_get_status,
+	.set_status	= legacy_set_status,
+	.get_features	= legacy_get_features,
+	.set_features	= legacy_set_features,
+	.get_isr	= legacy_get_isr,
+	.set_config_irq	= legacy_set_config_irq,
+	.get_queue_num	= legacy_get_queue_num,
+	.setup_queue	= legacy_setup_queue,
+	.del_queue	= legacy_del_queue,
+	.notify_queue	= legacy_notify_queue,
+};
+
+
+static inline uint8_t
+io_read8(uint8_t *addr)
+{
+	return *(volatile uint8_t *)addr;
+}
+
+static inline void
+io_write8(uint8_t val, uint8_t *addr)
+{
+	*(volatile uint8_t *)addr = val;
+}
+
+static inline uint16_t
+io_read16(uint16_t *addr)
+{
+	return *(volatile uint16_t *)addr;
+}
+
+static inline void
+io_write16(uint16_t val, uint16_t *addr)
+{
+	*(volatile uint16_t *)addr = val;
+}
+
+static inline uint32_t
+io_read32(uint32_t *addr)
+{
+	return *(volatile uint32_t *)addr;
+}
+
+static inline void
+io_write32(uint32_t val, uint32_t *addr)
+{
+	*(volatile uint32_t *)addr = val;
+}
+
+static inline void
+io_write64_twopart(uint64_t val, uint32_t *lo, uint32_t *hi)
+{
+	io_write32(val & ((1ULL << 32) - 1), lo);
+	io_write32(val >> 32,		     hi);
+}
+
+static void
+modern_read_dev_config(struct virtio_hw *hw, size_t offset,
+		       void *dst, int length)
+{
+	int i;
+	uint8_t *p;
+	uint8_t old_gen, new_gen;
+
+	do {
+		old_gen = io_read8(&hw->common_cfg->config_generation);
+
+		p = dst;
+		for (i = 0;  i < length; i++)
+			*p++ = io_read8((uint8_t *)hw->dev_cfg + offset + i);
+
+		new_gen = io_read8(&hw->common_cfg->config_generation);
+	} while (old_gen != new_gen);
+}
+
+static void
+modern_write_dev_config(struct virtio_hw *hw, size_t offset,
+			const void *src, int length)
+{
+	int i;
+	const uint8_t *p = src;
+
+	for (i = 0;  i < length; i++)
+		io_write8(*p++, (uint8_t *)hw->dev_cfg + offset + i);
+}
+
+static uint64_t
+modern_get_features(struct virtio_hw *hw)
+{
+	uint32_t features_lo, features_hi;
+
+	io_write32(0, &hw->common_cfg->device_feature_select);
+	features_lo = io_read32(&hw->common_cfg->device_feature);
+
+	io_write32(1, &hw->common_cfg->device_feature_select);
+	features_hi = io_read32(&hw->common_cfg->device_feature);
+
+	return ((uint64_t)features_hi << 32) | features_lo;
+}
+
+static void
+modern_set_features(struct virtio_hw *hw, uint64_t features)
+{
+	io_write32(0, &hw->common_cfg->guest_feature_select);
+	io_write32(features & ((1ULL << 32) - 1),
+		&hw->common_cfg->guest_feature);
+
+	io_write32(1, &hw->common_cfg->guest_feature_select);
+	io_write32(features >> 32,
+		&hw->common_cfg->guest_feature);
+}
+
+static uint8_t
+modern_get_status(struct virtio_hw *hw)
+{
+	return io_read8(&hw->common_cfg->device_status);
+}
+
+static void
+modern_set_status(struct virtio_hw *hw, uint8_t status)
+{
+	io_write8(status, &hw->common_cfg->device_status);
+}
+
+static void
+modern_reset(struct virtio_hw *hw)
+{
+	modern_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
+	modern_get_status(hw);
+}
+
+static uint8_t
+modern_get_isr(struct virtio_hw *hw)
+{
+	return io_read8(hw->isr);
+}
+
+static uint16_t
+modern_set_config_irq(struct virtio_hw *hw, uint16_t vec)
+{
+	io_write16(vec, &hw->common_cfg->msix_config);
+	return io_read16(&hw->common_cfg->msix_config);
+}
+
+static uint16_t
+modern_get_queue_num(struct virtio_hw *hw, uint16_t queue_id)
+{
+	io_write16(queue_id, &hw->common_cfg->queue_select);
+	return io_read16(&hw->common_cfg->queue_size);
+}
+
+static void
+modern_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+	uint64_t desc_addr, avail_addr, used_addr;
+	uint16_t notify_off;
+
+	desc_addr = vq->mz->phys_addr;
+	avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
+	used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
+							 ring[vq->vq_nentries]),
+				   VIRTIO_PCI_VRING_ALIGN);
+
+	io_write16(vq->vq_queue_index, &hw->common_cfg->queue_select);
+
+	io_write64_twopart(desc_addr, &hw->common_cfg->queue_desc_lo,
+				      &hw->common_cfg->queue_desc_hi);
+	io_write64_twopart(avail_addr, &hw->common_cfg->queue_avail_lo,
+				       &hw->common_cfg->queue_avail_hi);
+	io_write64_twopart(used_addr, &hw->common_cfg->queue_used_lo,
+				      &hw->common_cfg->queue_used_hi);
+
+	notify_off = io_read16(&hw->common_cfg->queue_notify_off);
+	vq->notify_addr = (void *)((uint8_t *)hw->notify_base +
+				notify_off * hw->notify_off_multiplier);
+
+	io_write16(1, &hw->common_cfg->queue_enable);
+
+	PMD_INIT_LOG(DEBUG, "queue %u addresses:", vq->vq_queue_index);
+	PMD_INIT_LOG(DEBUG, "\t desc_addr: %" PRIx64, desc_addr);
+	PMD_INIT_LOG(DEBUG, "\t aval_addr: %" PRIx64, avail_addr);
+	PMD_INIT_LOG(DEBUG, "\t used_addr: %" PRIx64, used_addr);
+	PMD_INIT_LOG(DEBUG, "\t notify addr: %p (notify offset: %u)",
+		vq->notify_addr, notify_off);
+}
+
+static void
+modern_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+	io_write16(vq->vq_queue_index, &hw->common_cfg->queue_select);
+
+	io_write64_twopart(0, &hw->common_cfg->queue_desc_lo,
+				  &hw->common_cfg->queue_desc_hi);
+	io_write64_twopart(0, &hw->common_cfg->queue_avail_lo,
+				  &hw->common_cfg->queue_avail_hi);
+	io_write64_twopart(0, &hw->common_cfg->queue_used_lo,
+				  &hw->common_cfg->queue_used_hi);
+
+	io_write16(0, &hw->common_cfg->queue_enable);
+}
+
+static void
+modern_notify_queue(struct virtio_hw *hw __rte_unused, struct virtqueue *vq)
+{
+	io_write16(1, vq->notify_addr);
+}
+
+static const struct virtio_pci_ops modern_ops = {
+	.read_dev_cfg	= modern_read_dev_config,
+	.write_dev_cfg	= modern_write_dev_config,
+	.reset		= modern_reset,
+	.get_status	= modern_get_status,
+	.set_status	= modern_set_status,
+	.get_features	= modern_get_features,
+	.set_features	= modern_set_features,
+	.get_isr	= modern_get_isr,
+	.set_config_irq	= modern_set_config_irq,
+	.get_queue_num	= modern_get_queue_num,
+	.setup_queue	= modern_setup_queue,
+	.del_queue	= modern_del_queue,
+	.notify_queue	= modern_notify_queue,
+};
+
+
+void
+vtpci_read_dev_config(struct virtio_hw *hw, size_t offset,
+		      void *dst, int length)
+{
+	hw->vtpci_ops->read_dev_cfg(hw, offset, dst, length);
+}
+
+void
+vtpci_write_dev_config(struct virtio_hw *hw, size_t offset,
+		       const void *src, int length)
+{
+	hw->vtpci_ops->write_dev_cfg(hw, offset, src, length);
+}
+
+uint64_t
+vtpci_negotiate_features(struct virtio_hw *hw, uint64_t host_features)
+{
+	uint64_t features;
+
+	/*
+	 * Limit negotiated features to what the driver, virtqueue, and
+	 * host all support.
+	 */
+	features = host_features & hw->guest_features;
+	hw->vtpci_ops->set_features(hw, features);
+
+	return features;
+}
+
+void
+vtpci_reset(struct virtio_hw *hw)
+{
+	hw->vtpci_ops->set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
+	/* flush status write */
+	hw->vtpci_ops->get_status(hw);
+}
+
+void
+vtpci_reinit_complete(struct virtio_hw *hw)
+{
+	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
+}
+
+void
+vtpci_set_status(struct virtio_hw *hw, uint8_t status)
+{
+	if (status != VIRTIO_CONFIG_STATUS_RESET)
+		status |= hw->vtpci_ops->get_status(hw);
+
+	hw->vtpci_ops->set_status(hw, status);
+}
+
+uint8_t
+vtpci_get_status(struct virtio_hw *hw)
+{
+	return hw->vtpci_ops->get_status(hw);
+}
+
+uint8_t
+vtpci_isr(struct virtio_hw *hw)
+{
+	return hw->vtpci_ops->get_isr(hw);
+}
+
+
+/* Enable one vector (0) for Link State Intrerrupt */
+uint16_t
+vtpci_irq_config(struct virtio_hw *hw, uint16_t vec)
+{
+	return hw->vtpci_ops->set_config_irq(hw, vec);
+}
+
+static void *
+get_cfg_addr(struct rte_pci_device *dev, struct virtio_pci_cap *cap)
+{
+	uint8_t  bar    = cap->bar;
+	uint32_t length = cap->length;
+	uint32_t offset = cap->offset;
+	uint8_t *base;
+
+	if (bar > 5) {
+		PMD_INIT_LOG(ERR, "invalid bar: %u", bar);
+		return NULL;
+	}
+
+	if (offset + length < offset) {
+		PMD_INIT_LOG(ERR, "offset(%u) + length(%u) overflows",
+			offset, length);
+		return NULL;
+	}
+
+	if (offset + length > dev->mem_resource[bar].len) {
+		PMD_INIT_LOG(ERR,
+			"invalid cap: overflows bar space: %u > %" PRIu64,
+			offset + length, dev->mem_resource[bar].len);
+		return NULL;
+	}
+
+	base = dev->mem_resource[bar].addr;
+	if (base == NULL) {
+		PMD_INIT_LOG(ERR, "bar %u base addr is NULL", bar);
+		return NULL;
+	}
+
+	return base + offset;
+}
+
+static int
+virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw)
+{
+	uint8_t pos;
+	struct virtio_pci_cap cap;
+	int ret;
+
+	if (rte_eal_pci_map_device(dev)) {
+		PMD_INIT_LOG(DEBUG, "failed to map pci device!");
+		return -1;
+	}
+
+	ret = rte_eal_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
+	if (ret < 0) {
+		PMD_INIT_LOG(DEBUG, "failed to read pci capability list");
+		return -1;
+	}
+
+	while (pos) {
+		ret = rte_eal_pci_read_config(dev, &cap, sizeof(cap), pos);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR,
+				"failed to read pci cap at pos: %x", pos);
+			break;
+		}
+
+		if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
+			PMD_INIT_LOG(DEBUG,
+				"[%2x] skipping non VNDR cap id: %02x",
+				pos, cap.cap_vndr);
+			goto next;
+		}
+
+		PMD_INIT_LOG(DEBUG,
+			"[%2x] cfg type: %u, bar: %u, offset: %04x, len: %u",
+			pos, cap.cfg_type, cap.bar, cap.offset, cap.length);
+
+		switch (cap.cfg_type) {
+		case VIRTIO_PCI_CAP_COMMON_CFG:
+			hw->common_cfg = get_cfg_addr(dev, &cap);
+			break;
+		case VIRTIO_PCI_CAP_NOTIFY_CFG:
+			rte_eal_pci_read_config(dev, &hw->notify_off_multiplier,
+						4, pos + sizeof(cap));
+			hw->notify_base = get_cfg_addr(dev, &cap);
+			break;
+		case VIRTIO_PCI_CAP_DEVICE_CFG:
+			hw->dev_cfg = get_cfg_addr(dev, &cap);
+			break;
+		case VIRTIO_PCI_CAP_ISR_CFG:
+			hw->isr = get_cfg_addr(dev, &cap);
+			break;
+		}
+
+next:
+		pos = cap.cap_next;
+	}
+
+	if (hw->common_cfg == NULL || hw->notify_base == NULL ||
+	    hw->dev_cfg == NULL    || hw->isr == NULL) {
+		PMD_INIT_LOG(INFO, "no modern virtio pci device found.");
+		return -1;
+	}
+
+	PMD_INIT_LOG(INFO, "found modern virtio pci device.");
+
+	PMD_INIT_LOG(DEBUG, "common cfg mapped at: %p", hw->common_cfg);
+	PMD_INIT_LOG(DEBUG, "device cfg mapped at: %p", hw->dev_cfg);
+	PMD_INIT_LOG(DEBUG, "isr cfg mapped at: %p", hw->isr);
+	PMD_INIT_LOG(DEBUG, "notify base: %p, notify off multiplier: %u",
+		hw->notify_base, hw->notify_off_multiplier);
+
+	return 0;
+}
+
+/*
+ * Return -1:
+ *   if there is error mapping with VFIO/UIO.
+ *   if port map error when driver type is KDRV_NONE.
+ * Return 1 if kernel driver is managing the device.
+ * Return 0 on success.
+ */
+int
+vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw)
+{
+	hw->dev = dev;
+
+	/*
+	 * Try if we can succeed reading virtio pci caps, which exists
+	 * only on modern pci device. If failed, we fallback to legacy
+	 * virtio handling.
+	 */
+	if (virtio_read_caps(dev, hw) == 0) {
+		PMD_INIT_LOG(INFO, "modern virtio pci detected.");
+		hw->vtpci_ops = &modern_ops;
+		hw->modern    = 1;
+		dev->driver->drv_flags |= RTE_PCI_DRV_INTR_LSC;
+		return 0;
+	}
+
+	PMD_INIT_LOG(INFO, "trying with legacy virtio pci.");
+	if (legacy_virtio_resource_init(dev, hw) < 0) {
+		if (dev->kdrv == RTE_KDRV_UNKNOWN &&
+		    dev->devargs->type != RTE_DEVTYPE_WHITELISTED_PCI) {
+			PMD_INIT_LOG(INFO,
+				"skip kernel managed virtio device.");
+			return 1;
+		}
+		return -1;
+	}
+
+	hw->vtpci_ops = &legacy_ops;
+	hw->use_msix = legacy_virtio_has_msix(&dev->addr);
+	hw->modern   = 0;
+
+	return 0;
+}
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
new file mode 100644
index 00000000..b69785ea
--- /dev/null
+++ b/drivers/net/virtio/virtio_pci.h
@@ -0,0 +1,314 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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.
+ */
+
+#ifndef _VIRTIO_PCI_H_
+#define _VIRTIO_PCI_H_
+
+#include <stdint.h>
+
+#include <rte_pci.h>
+#include <rte_ethdev.h>
+
+struct virtqueue;
+
+/* VirtIO PCI vendor/device ID. */
+#define VIRTIO_PCI_VENDORID     0x1AF4
+#define VIRTIO_PCI_DEVICEID_MIN 0x1000
+#define VIRTIO_PCI_DEVICEID_MAX 0x103F
+
+/* VirtIO ABI version, this must match exactly. */
+#define VIRTIO_PCI_ABI_VERSION 0
+
+/*
+ * VirtIO Header, located in BAR 0.
+ */
+#define VIRTIO_PCI_HOST_FEATURES  0  /* host's supported features (32bit, RO)*/
+#define VIRTIO_PCI_GUEST_FEATURES 4  /* guest's supported features (32, RW) */
+#define VIRTIO_PCI_QUEUE_PFN      8  /* physical address of VQ (32, RW) */
+#define VIRTIO_PCI_QUEUE_NUM      12 /* number of ring entries (16, RO) */
+#define VIRTIO_PCI_QUEUE_SEL      14 /* current VQ selection (16, RW) */
+#define VIRTIO_PCI_QUEUE_NOTIFY   16 /* notify host regarding VQ (16, RW) */
+#define VIRTIO_PCI_STATUS         18 /* device status register (8, RW) */
+#define VIRTIO_PCI_ISR		  19 /* interrupt status register, reading
+				      * also clears the register (8, RO) */
+/* Only if MSIX is enabled: */
+#define VIRTIO_MSI_CONFIG_VECTOR  20 /* configuration change vector (16, RW) */
+#define VIRTIO_MSI_QUEUE_VECTOR	  22 /* vector for selected VQ notifications
+				      (16, RW) */
+
+/* The bit of the ISR which indicates a device has an interrupt. */
+#define VIRTIO_PCI_ISR_INTR   0x1
+/* The bit of the ISR which indicates a device configuration change. */
+#define VIRTIO_PCI_ISR_CONFIG 0x2
+/* Vector value used to disable MSI for queue. */
+#define VIRTIO_MSI_NO_VECTOR 0xFFFF
+
+/* VirtIO device IDs. */
+#define VIRTIO_ID_NETWORK  0x01
+#define VIRTIO_ID_BLOCK    0x02
+#define VIRTIO_ID_CONSOLE  0x03
+#define VIRTIO_ID_ENTROPY  0x04
+#define VIRTIO_ID_BALLOON  0x05
+#define VIRTIO_ID_IOMEMORY 0x06
+#define VIRTIO_ID_9P       0x09
+
+/* Status byte for guest to report progress. */
+#define VIRTIO_CONFIG_STATUS_RESET     0x00
+#define VIRTIO_CONFIG_STATUS_ACK       0x01
+#define VIRTIO_CONFIG_STATUS_DRIVER    0x02
+#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
+#define VIRTIO_CONFIG_STATUS_FEATURES_OK 0x08
+#define VIRTIO_CONFIG_STATUS_FAILED    0x80
+
+/*
+ * Each virtqueue indirect descriptor list must be physically contiguous.
+ * To allow us to malloc(9) each list individually, limit the number
+ * supported to what will fit in one page. With 4KB pages, this is a limit
+ * of 256 descriptors. If there is ever a need for more, we can switch to
+ * contigmalloc(9) for the larger allocations, similar to what
+ * bus_dmamem_alloc(9) does.
+ *
+ * Note the sizeof(struct vring_desc) is 16 bytes.
+ */
+#define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
+
+/* The feature bitmap for virtio net */
+#define VIRTIO_NET_F_CSUM	0	/* Host handles pkts w/ partial csum */
+#define VIRTIO_NET_F_GUEST_CSUM	1	/* Guest handles pkts w/ partial csum */
+#define VIRTIO_NET_F_MAC	5	/* Host has given MAC address. */
+#define VIRTIO_NET_F_GUEST_TSO4	7	/* Guest can handle TSOv4 in. */
+#define VIRTIO_NET_F_GUEST_TSO6	8	/* Guest can handle TSOv6 in. */
+#define VIRTIO_NET_F_GUEST_ECN	9	/* Guest can handle TSO[6] w/ ECN in. */
+#define VIRTIO_NET_F_GUEST_UFO	10	/* Guest can handle UFO in. */
+#define VIRTIO_NET_F_HOST_TSO4	11	/* Host can handle TSOv4 in. */
+#define VIRTIO_NET_F_HOST_TSO6	12	/* Host can handle TSOv6 in. */
+#define VIRTIO_NET_F_HOST_ECN	13	/* Host can handle TSO[6] w/ ECN in. */
+#define VIRTIO_NET_F_HOST_UFO	14	/* Host can handle UFO in. */
+#define VIRTIO_NET_F_MRG_RXBUF	15	/* Host can merge receive buffers. */
+#define VIRTIO_NET_F_STATUS	16	/* virtio_net_config.status available */
+#define VIRTIO_NET_F_CTRL_VQ	17	/* Control channel available */
+#define VIRTIO_NET_F_CTRL_RX	18	/* Control channel RX mode support */
+#define VIRTIO_NET_F_CTRL_VLAN	19	/* Control channel VLAN filtering */
+#define VIRTIO_NET_F_CTRL_RX_EXTRA 20	/* Extra RX mode control support */
+#define VIRTIO_NET_F_GUEST_ANNOUNCE 21	/* Guest can announce device on the
+					 * network */
+#define VIRTIO_NET_F_MQ		22	/* Device supports Receive Flow
+					 * Steering */
+#define VIRTIO_NET_F_CTRL_MAC_ADDR 23	/* Set MAC address */
+
+/* Do we get callbacks when the ring is completely used, even if we've
+ * suppressed them? */
+#define VIRTIO_F_NOTIFY_ON_EMPTY	24
+
+/* Can the device handle any descriptor layout? */
+#define VIRTIO_F_ANY_LAYOUT		27
+
+/* We support indirect buffer descriptors */
+#define VIRTIO_RING_F_INDIRECT_DESC	28
+
+#define VIRTIO_F_VERSION_1		32
+
+/*
+ * Some VirtIO feature bits (currently bits 28 through 31) are
+ * reserved for the transport being used (eg. virtio_ring), the
+ * rest are per-device feature bits.
+ */
+#define VIRTIO_TRANSPORT_F_START 28
+#define VIRTIO_TRANSPORT_F_END   32
+
+/* The Guest publishes the used index for which it expects an interrupt
+ * at the end of the avail ring. Host should ignore the avail->flags field. */
+/* The Host publishes the avail index for which it expects a kick
+ * at the end of the used ring. Guest should ignore the used->flags field. */
+#define VIRTIO_RING_F_EVENT_IDX		29
+
+#define VIRTIO_NET_S_LINK_UP	1	/* Link is up */
+#define VIRTIO_NET_S_ANNOUNCE	2	/* Announcement is needed */
+
+/*
+ * Maximum number of virtqueues per device.
+ */
+#define VIRTIO_MAX_VIRTQUEUES 8
+
+/* Common configuration */
+#define VIRTIO_PCI_CAP_COMMON_CFG	1
+/* Notifications */
+#define VIRTIO_PCI_CAP_NOTIFY_CFG	2
+/* ISR Status */
+#define VIRTIO_PCI_CAP_ISR_CFG		3
+/* Device specific configuration */
+#define VIRTIO_PCI_CAP_DEVICE_CFG	4
+/* PCI configuration access */
+#define VIRTIO_PCI_CAP_PCI_CFG		5
+
+/* This is the PCI capability header: */
+struct virtio_pci_cap {
+	uint8_t cap_vndr;		/* Generic PCI field: PCI_CAP_ID_VNDR */
+	uint8_t cap_next;		/* Generic PCI field: next ptr. */
+	uint8_t cap_len;		/* Generic PCI field: capability length */
+	uint8_t cfg_type;		/* Identifies the structure. */
+	uint8_t bar;			/* Where to find it. */
+	uint8_t padding[3];		/* Pad to full dword. */
+	uint32_t offset;		/* Offset within bar. */
+	uint32_t length;		/* Length of the structure, in bytes. */
+};
+
+struct virtio_pci_notify_cap {
+	struct virtio_pci_cap cap;
+	uint32_t notify_off_multiplier;	/* Multiplier for queue_notify_off. */
+};
+
+/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
+struct virtio_pci_common_cfg {
+	/* About the whole device. */
+	uint32_t device_feature_select;	/* read-write */
+	uint32_t device_feature;	/* read-only */
+	uint32_t guest_feature_select;	/* read-write */
+	uint32_t guest_feature;		/* read-write */
+	uint16_t msix_config;		/* read-write */
+	uint16_t num_queues;		/* read-only */
+	uint8_t device_status;		/* read-write */
+	uint8_t config_generation;	/* read-only */
+
+	/* About a specific virtqueue. */
+	uint16_t queue_select;		/* read-write */
+	uint16_t queue_size;		/* read-write, power of 2. */
+	uint16_t queue_msix_vector;	/* read-write */
+	uint16_t queue_enable;		/* read-write */
+	uint16_t queue_notify_off;	/* read-only */
+	uint32_t queue_desc_lo;		/* read-write */
+	uint32_t queue_desc_hi;		/* read-write */
+	uint32_t queue_avail_lo;	/* read-write */
+	uint32_t queue_avail_hi;	/* read-write */
+	uint32_t queue_used_lo;		/* read-write */
+	uint32_t queue_used_hi;		/* read-write */
+};
+
+struct virtio_hw;
+
+struct virtio_pci_ops {
+	void (*read_dev_cfg)(struct virtio_hw *hw, size_t offset,
+			     void *dst, int len);
+	void (*write_dev_cfg)(struct virtio_hw *hw, size_t offset,
+			      const void *src, int len);
+	void (*reset)(struct virtio_hw *hw);
+
+	uint8_t (*get_status)(struct virtio_hw *hw);
+	void    (*set_status)(struct virtio_hw *hw, uint8_t status);
+
+	uint64_t (*get_features)(struct virtio_hw *hw);
+	void     (*set_features)(struct virtio_hw *hw, uint64_t features);
+
+	uint8_t (*get_isr)(struct virtio_hw *hw);
+
+	uint16_t (*set_config_irq)(struct virtio_hw *hw, uint16_t vec);
+
+	uint16_t (*get_queue_num)(struct virtio_hw *hw, uint16_t queue_id);
+	void (*setup_queue)(struct virtio_hw *hw, struct virtqueue *vq);
+	void (*del_queue)(struct virtio_hw *hw, struct virtqueue *vq);
+	void (*notify_queue)(struct virtio_hw *hw, struct virtqueue *vq);
+};
+
+struct virtio_net_config;
+
+struct virtio_hw {
+	struct virtqueue *cvq;
+	struct rte_pci_ioport io;
+	uint64_t    guest_features;
+	uint32_t    max_tx_queues;
+	uint32_t    max_rx_queues;
+	uint16_t    vtnet_hdr_size;
+	uint8_t	    vlan_strip;
+	uint8_t	    use_msix;
+	uint8_t     started;
+	uint8_t     modern;
+	uint8_t     mac_addr[ETHER_ADDR_LEN];
+	uint32_t    notify_off_multiplier;
+	uint8_t     *isr;
+	uint16_t    *notify_base;
+	struct rte_pci_device *dev;
+	struct virtio_pci_common_cfg *common_cfg;
+	struct virtio_net_config *dev_cfg;
+	const struct virtio_pci_ops *vtpci_ops;
+};
+
+/*
+ * This structure is just a reference to read
+ * net device specific config space; it just a chodu structure
+ *
+ */
+struct virtio_net_config {
+	/* The config defining mac address (if VIRTIO_NET_F_MAC) */
+	uint8_t    mac[ETHER_ADDR_LEN];
+	/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
+	uint16_t   status;
+	uint16_t   max_virtqueue_pairs;
+} __attribute__((packed));
+
+/*
+ * How many bits to shift physical queue address written to QUEUE_PFN.
+ * 12 is historical, and due to x86 page size.
+ */
+#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
+
+/* The alignment to use between consumer and producer parts of vring. */
+#define VIRTIO_PCI_VRING_ALIGN 4096
+
+static inline int
+vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
+{
+	return (hw->guest_features & (1ULL << bit)) != 0;
+}
+
+/*
+ * Function declaration from virtio_pci.c
+ */
+int vtpci_init(struct rte_pci_device *, struct virtio_hw *);
+void vtpci_reset(struct virtio_hw *);
+
+void vtpci_reinit_complete(struct virtio_hw *);
+
+uint8_t vtpci_get_status(struct virtio_hw *);
+void vtpci_set_status(struct virtio_hw *, uint8_t);
+
+uint64_t vtpci_negotiate_features(struct virtio_hw *, uint64_t);
+
+void vtpci_write_dev_config(struct virtio_hw *, size_t, const void *, int);
+
+void vtpci_read_dev_config(struct virtio_hw *, size_t, void *, int);
+
+uint8_t vtpci_isr(struct virtio_hw *);
+
+uint16_t vtpci_irq_config(struct virtio_hw *, uint16_t);
+
+#endif /* _VIRTIO_PCI_H_ */
diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
new file mode 100644
index 00000000..447760a8
--- /dev/null
+++ b/drivers/net/virtio/virtio_ring.h
@@ -0,0 +1,163 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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.
+ */
+
+#ifndef _VIRTIO_RING_H_
+#define _VIRTIO_RING_H_
+
+#include <stdint.h>
+
+#include <rte_common.h>
+
+/* This marks a buffer as continuing via the next field. */
+#define VRING_DESC_F_NEXT       1
+/* This marks a buffer as write-only (otherwise read-only). */
+#define VRING_DESC_F_WRITE      2
+/* This means the buffer contains a list of buffer descriptors. */
+#define VRING_DESC_F_INDIRECT   4
+
+/* The Host uses this in used->flags to advise the Guest: don't kick me
+ * when you add a buffer.  It's unreliable, so it's simply an
+ * optimization.  Guest will still kick if it's out of buffers. */
+#define VRING_USED_F_NO_NOTIFY  1
+/* The Guest uses this in avail->flags to advise the Host: don't
+ * interrupt me when you consume a buffer.  It's unreliable, so it's
+ * simply an optimization.  */
+#define VRING_AVAIL_F_NO_INTERRUPT  1
+
+/* VirtIO ring descriptors: 16 bytes.
+ * These can chain together via "next". */
+struct vring_desc {
+	uint64_t addr;  /*  Address (guest-physical). */
+	uint32_t len;   /* Length. */
+	uint16_t flags; /* The flags as indicated above. */
+	uint16_t next;  /* We chain unused descriptors via this. */
+};
+
+struct vring_avail {
+	uint16_t flags;
+	uint16_t idx;
+	uint16_t ring[0];
+};
+
+/* id is a 16bit index. uint32_t is used here for ids for padding reasons. */
+struct vring_used_elem {
+	/* Index of start of used descriptor chain. */
+	uint32_t id;
+	/* Total length of the descriptor chain which was written to. */
+	uint32_t len;
+};
+
+struct vring_used {
+	uint16_t flags;
+	uint16_t idx;
+	struct vring_used_elem ring[0];
+};
+
+struct vring {
+	unsigned int num;
+	struct vring_desc  *desc;
+	struct vring_avail *avail;
+	struct vring_used  *used;
+};
+
+/* The standard layout for the ring is a continuous chunk of memory which
+ * looks like this.  We assume num is a power of 2.
+ *
+ * struct vring {
+ *      // The actual descriptors (16 bytes each)
+ *      struct vring_desc desc[num];
+ *
+ *      // A ring of available descriptor heads with free-running index.
+ *      __u16 avail_flags;
+ *      __u16 avail_idx;
+ *      __u16 available[num];
+ *      __u16 used_event_idx;
+ *
+ *      // Padding to the next align boundary.
+ *      char pad[];
+ *
+ *      // A ring of used descriptor heads with free-running index.
+ *      __u16 used_flags;
+ *      __u16 used_idx;
+ *      struct vring_used_elem used[num];
+ *      __u16 avail_event_idx;
+ * };
+ *
+ * NOTE: for VirtIO PCI, align is 4096.
+ */
+
+/*
+ * We publish the used event index at the end of the available ring, and vice
+ * versa. They are at the end for backwards compatibility.
+ */
+#define vring_used_event(vr)  ((vr)->avail->ring[(vr)->num])
+#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
+
+static inline size_t
+vring_size(unsigned int num, unsigned long align)
+{
+	size_t size;
+
+	size = num * sizeof(struct vring_desc);
+	size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
+	size = RTE_ALIGN_CEIL(size, align);
+	size += sizeof(struct vring_used) +
+		(num * sizeof(struct vring_used_elem));
+	return size;
+}
+
+static inline void
+vring_init(struct vring *vr, unsigned int num, uint8_t *p,
+	unsigned long align)
+{
+	vr->num = num;
+	vr->desc = (struct vring_desc *) p;
+	vr->avail = (struct vring_avail *) (p +
+		num * sizeof(struct vring_desc));
+	vr->used = (void *)
+		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
+}
+
+/*
+ * The following is used with VIRTIO_RING_F_EVENT_IDX.
+ * Assuming a given event_idx value from the other size, if we have
+ * just incremented index from old to new_idx, should we trigger an
+ * event?
+ */
+static inline int
+vring_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
+{
+	return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
+}
+
+#endif /* _VIRTIO_RING_H_ */
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
new file mode 100644
index 00000000..ef21d8e3
--- /dev/null
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -0,0 +1,940 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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 <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rte_cycles.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_branch_prediction.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_string_fns.h>
+#include <rte_errno.h>
+#include <rte_byteorder.h>
+
+#include "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtio_pci.h"
+#include "virtqueue.h"
+#include "virtio_rxtx.h"
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
+#define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
+#else
+#define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
+#endif
+
+
+#define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
+	ETH_TXQ_FLAGS_NOOFFLOADS)
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+static int use_simple_rxtx;
+#endif
+
+static void
+vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
+{
+	struct vring_desc *dp, *dp_tail;
+	struct vq_desc_extra *dxp;
+	uint16_t desc_idx_last = desc_idx;
+
+	dp  = &vq->vq_ring.desc[desc_idx];
+	dxp = &vq->vq_descx[desc_idx];
+	vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
+	if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
+		while (dp->flags & VRING_DESC_F_NEXT) {
+			desc_idx_last = dp->next;
+			dp = &vq->vq_ring.desc[dp->next];
+		}
+	}
+	dxp->ndescs = 0;
+
+	/*
+	 * We must append the existing free chain, if any, to the end of
+	 * newly freed chain. If the virtqueue was completely used, then
+	 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
+	 */
+	if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
+		vq->vq_desc_head_idx = desc_idx;
+	} else {
+		dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
+		dp_tail->next = desc_idx;
+	}
+
+	vq->vq_desc_tail_idx = desc_idx_last;
+	dp->next = VQ_RING_DESC_CHAIN_END;
+}
+
+static uint16_t
+virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
+			   uint32_t *len, uint16_t num)
+{
+	struct vring_used_elem *uep;
+	struct rte_mbuf *cookie;
+	uint16_t used_idx, desc_idx;
+	uint16_t i;
+
+	/*  Caller does the check */
+	for (i = 0; i < num ; i++) {
+		used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
+		uep = &vq->vq_ring.used->ring[used_idx];
+		desc_idx = (uint16_t) uep->id;
+		len[i] = uep->len;
+		cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
+
+		if (unlikely(cookie == NULL)) {
+			PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
+				vq->vq_used_cons_idx);
+			break;
+		}
+
+		rte_prefetch0(cookie);
+		rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+		rx_pkts[i]  = cookie;
+		vq->vq_used_cons_idx++;
+		vq_ring_free_chain(vq, desc_idx);
+		vq->vq_descx[desc_idx].cookie = NULL;
+	}
+
+	return i;
+}
+
+#ifndef DEFAULT_TX_FREE_THRESH
+#define DEFAULT_TX_FREE_THRESH 32
+#endif
+
+/* Cleanup from completed transmits. */
+static void
+virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
+{
+	uint16_t i, used_idx, desc_idx;
+	for (i = 0; i < num; i++) {
+		struct vring_used_elem *uep;
+		struct vq_desc_extra *dxp;
+
+		used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
+		uep = &vq->vq_ring.used->ring[used_idx];
+
+		desc_idx = (uint16_t) uep->id;
+		dxp = &vq->vq_descx[desc_idx];
+		vq->vq_used_cons_idx++;
+		vq_ring_free_chain(vq, desc_idx);
+
+		if (dxp->cookie != NULL) {
+			rte_pktmbuf_free(dxp->cookie);
+			dxp->cookie = NULL;
+		}
+	}
+}
+
+
+static inline int
+virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
+{
+	struct vq_desc_extra *dxp;
+	struct virtio_hw *hw = vq->hw;
+	struct vring_desc *start_dp;
+	uint16_t needed = 1;
+	uint16_t head_idx, idx;
+
+	if (unlikely(vq->vq_free_cnt == 0))
+		return -ENOSPC;
+	if (unlikely(vq->vq_free_cnt < needed))
+		return -EMSGSIZE;
+
+	head_idx = vq->vq_desc_head_idx;
+	if (unlikely(head_idx >= vq->vq_nentries))
+		return -EFAULT;
+
+	idx = head_idx;
+	dxp = &vq->vq_descx[idx];
+	dxp->cookie = (void *)cookie;
+	dxp->ndescs = needed;
+
+	start_dp = vq->vq_ring.desc;
+	start_dp[idx].addr =
+		(uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM
+		- hw->vtnet_hdr_size);
+	start_dp[idx].len =
+		cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
+	start_dp[idx].flags =  VRING_DESC_F_WRITE;
+	idx = start_dp[idx].next;
+	vq->vq_desc_head_idx = idx;
+	if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
+		vq->vq_desc_tail_idx = idx;
+	vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
+	vq_update_avail_ring(vq, head_idx);
+
+	return 0;
+}
+
+static inline void
+virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie,
+		       uint16_t needed, int use_indirect, int can_push)
+{
+	struct vq_desc_extra *dxp;
+	struct vring_desc *start_dp;
+	uint16_t seg_num = cookie->nb_segs;
+	uint16_t head_idx, idx;
+	uint16_t head_size = txvq->hw->vtnet_hdr_size;
+	unsigned long offs;
+
+	head_idx = txvq->vq_desc_head_idx;
+	idx = head_idx;
+	dxp = &txvq->vq_descx[idx];
+	dxp->cookie = (void *)cookie;
+	dxp->ndescs = needed;
+
+	start_dp = txvq->vq_ring.desc;
+
+	if (can_push) {
+		/* put on zero'd transmit header (no offloads) */
+		void *hdr = rte_pktmbuf_prepend(cookie, head_size);
+
+		memset(hdr, 0, head_size);
+	} else if (use_indirect) {
+		/* setup tx ring slot to point to indirect
+		 * descriptor list stored in reserved region.
+		 *
+		 * the first slot in indirect ring is already preset
+		 * to point to the header in reserved region
+		 */
+		struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
+
+		offs = idx * sizeof(struct virtio_tx_region)
+			+ offsetof(struct virtio_tx_region, tx_indir);
+
+		start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
+		start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
+		start_dp[idx].flags = VRING_DESC_F_INDIRECT;
+
+		/* loop below will fill in rest of the indirect elements */
+		start_dp = txr[idx].tx_indir;
+		idx = 1;
+	} else {
+		/* setup first tx ring slot to point to header
+		 * stored in reserved region.
+		 */
+		offs = idx * sizeof(struct virtio_tx_region)
+			+ offsetof(struct virtio_tx_region, tx_hdr);
+
+		start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
+		start_dp[idx].len   = txvq->hw->vtnet_hdr_size;
+		start_dp[idx].flags = VRING_DESC_F_NEXT;
+		idx = start_dp[idx].next;
+	}
+
+	do {
+		start_dp[idx].addr  = rte_mbuf_data_dma_addr(cookie);
+		start_dp[idx].len   = cookie->data_len;
+		start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
+		idx = start_dp[idx].next;
+	} while ((cookie = cookie->next) != NULL);
+
+	start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
+
+	if (use_indirect)
+		idx = txvq->vq_ring.desc[head_idx].next;
+
+	txvq->vq_desc_head_idx = idx;
+	if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
+		txvq->vq_desc_tail_idx = idx;
+	txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
+	vq_update_avail_ring(txvq, head_idx);
+}
+
+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;
+}
+
+static void
+virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
+{
+	struct rte_mbuf *m;
+	int i, nbufs, error, size = vq->vq_nentries;
+	struct vring *vr = &vq->vq_ring;
+	uint8_t *ring_mem = vq->vq_ring_virt_mem;
+
+	PMD_INIT_FUNC_TRACE();
+
+	/*
+	 * Reinitialise since virtio port might have been stopped and restarted
+	 */
+	memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
+	vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+	vq->vq_used_cons_idx = 0;
+	vq->vq_desc_head_idx = 0;
+	vq->vq_avail_idx = 0;
+	vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
+	vq->vq_free_cnt = vq->vq_nentries;
+	memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
+
+	vring_desc_init(vr->desc, size);
+
+	/*
+	 * Disable device(host) interrupting guest
+	 */
+	virtqueue_disable_intr(vq);
+
+	/* Only rx virtqueue needs mbufs to be allocated at initialization */
+	if (queue_type == VTNET_RQ) {
+		if (vq->mpool == NULL)
+			rte_exit(EXIT_FAILURE,
+			"Cannot allocate initial mbufs for rx virtqueue");
+
+		/* Allocate blank mbufs for the each rx descriptor */
+		nbufs = 0;
+		error = ENOSPC;
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+		if (use_simple_rxtx)
+			for (i = 0; i < vq->vq_nentries; i++) {
+				vq->vq_ring.avail->ring[i] = i;
+				vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
+			}
+#endif
+		memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
+		for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
+			vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
+
+		while (!virtqueue_full(vq)) {
+			m = rte_rxmbuf_alloc(vq->mpool);
+			if (m == NULL)
+				break;
+
+			/******************************************
+			*         Enqueue allocated buffers        *
+			*******************************************/
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+			if (use_simple_rxtx)
+				error = virtqueue_enqueue_recv_refill_simple(vq, m);
+			else
+#endif
+				error = virtqueue_enqueue_recv_refill(vq, m);
+			if (error) {
+				rte_pktmbuf_free(m);
+				break;
+			}
+			nbufs++;
+		}
+
+		vq_update_avail_idx(vq);
+
+		PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
+	} else if (queue_type == VTNET_TQ) {
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+		if (use_simple_rxtx) {
+			int mid_idx  = vq->vq_nentries >> 1;
+			for (i = 0; i < mid_idx; i++) {
+				vq->vq_ring.avail->ring[i] = i + mid_idx;
+				vq->vq_ring.desc[i + mid_idx].next = i;
+				vq->vq_ring.desc[i + mid_idx].addr =
+					vq->virtio_net_hdr_mem +
+					offsetof(struct virtio_tx_region, tx_hdr);
+				vq->vq_ring.desc[i + mid_idx].len =
+					vq->hw->vtnet_hdr_size;
+				vq->vq_ring.desc[i + mid_idx].flags =
+					VRING_DESC_F_NEXT;
+				vq->vq_ring.desc[i].flags = 0;
+			}
+			for (i = mid_idx; i < vq->vq_nentries; i++)
+				vq->vq_ring.avail->ring[i] = i;
+		}
+#endif
+	}
+}
+
+void
+virtio_dev_cq_start(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw = dev->data->dev_private;
+
+	if (hw->cvq) {
+		virtio_dev_vring_start(hw->cvq, VTNET_CQ);
+		VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
+	}
+}
+
+void
+virtio_dev_rxtx_start(struct rte_eth_dev *dev)
+{
+	/*
+	 * Start receive and transmit vrings
+	 * -	Setup vring structure for all queues
+	 * -	Initialize descriptor for the rx vring
+	 * -	Allocate blank mbufs for the each rx descriptor
+	 *
+	 */
+	int i;
+
+	PMD_INIT_FUNC_TRACE();
+
+	/* Start rx vring. */
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
+	}
+
+	/* Start tx vring. */
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
+		VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
+	}
+}
+
+int
+virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
+			uint16_t queue_idx,
+			uint16_t nb_desc,
+			unsigned int socket_id,
+			__rte_unused const struct rte_eth_rxconf *rx_conf,
+			struct rte_mempool *mp)
+{
+	uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
+	struct virtqueue *vq;
+	int ret;
+
+	PMD_INIT_FUNC_TRACE();
+	ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
+			nb_desc, socket_id, &vq);
+	if (ret < 0) {
+		PMD_INIT_LOG(ERR, "rvq initialization failed");
+		return ret;
+	}
+
+	/* Create mempool for rx mbuf allocation */
+	vq->mpool = mp;
+
+	dev->data->rx_queues[queue_idx] = vq;
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+	virtio_rxq_vec_setup(vq);
+#endif
+
+	return 0;
+}
+
+void
+virtio_dev_rx_queue_release(void *rxq)
+{
+	virtio_dev_queue_release(rxq);
+}
+
+/*
+ * struct rte_eth_dev *dev: Used to update dev
+ * uint16_t nb_desc: Defaults to values read from config space
+ * unsigned int socket_id: Used to allocate memzone
+ * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
+ * uint16_t queue_idx: Just used as an index in dev txq list
+ */
+int
+virtio_dev_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)
+{
+	uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+	struct virtio_hw *hw = dev->data->dev_private;
+#endif
+	struct virtqueue *vq;
+	uint16_t tx_free_thresh;
+	int ret;
+
+	PMD_INIT_FUNC_TRACE();
+
+	if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
+	    != ETH_TXQ_FLAGS_NOXSUMS) {
+		PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
+		return -EINVAL;
+	}
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+	/* Use simple rx/tx func if single segment and no offloads */
+	if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
+	     !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+		PMD_INIT_LOG(INFO, "Using simple rx/tx path");
+		dev->tx_pkt_burst = virtio_xmit_pkts_simple;
+		dev->rx_pkt_burst = virtio_recv_pkts_vec;
+		use_simple_rxtx = 1;
+	}
+#endif
+
+	ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
+			nb_desc, socket_id, &vq);
+	if (ret < 0) {
+		PMD_INIT_LOG(ERR, "rvq initialization failed");
+		return ret;
+	}
+
+	tx_free_thresh = tx_conf->tx_free_thresh;
+	if (tx_free_thresh == 0)
+		tx_free_thresh =
+			RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
+
+	if (tx_free_thresh >= (vq->vq_nentries - 3)) {
+		RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
+			"number of TX entries minus 3 (%u)."
+			" (tx_free_thresh=%u port=%u queue=%u)\n",
+			vq->vq_nentries - 3,
+			tx_free_thresh, dev->data->port_id, queue_idx);
+		return -EINVAL;
+	}
+
+	vq->vq_free_thresh = tx_free_thresh;
+
+	dev->data->tx_queues[queue_idx] = vq;
+	return 0;
+}
+
+void
+virtio_dev_tx_queue_release(void *txq)
+{
+	virtio_dev_queue_release(txq);
+}
+
+static void
+virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
+{
+	int error;
+	/*
+	 * Requeue the discarded mbuf. This should always be
+	 * successful since it was just dequeued.
+	 */
+	error = virtqueue_enqueue_recv_refill(vq, m);
+	if (unlikely(error)) {
+		RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
+		rte_pktmbuf_free(m);
+	}
+}
+
+static void
+virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf)
+{
+	uint32_t s = mbuf->pkt_len;
+	struct ether_addr *ea;
+
+	if (s == 64) {
+		vq->size_bins[1]++;
+	} else if (s > 64 && s < 1024) {
+		uint32_t bin;
+
+		/* count zeros, and offset into correct bin */
+		bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
+		vq->size_bins[bin]++;
+	} else {
+		if (s < 64)
+			vq->size_bins[0]++;
+		else if (s < 1519)
+			vq->size_bins[6]++;
+		else if (s >= 1519)
+			vq->size_bins[7]++;
+	}
+
+	ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
+	if (is_multicast_ether_addr(ea)) {
+		if (is_broadcast_ether_addr(ea))
+			vq->broadcast++;
+		else
+			vq->multicast++;
+	}
+}
+
+#define VIRTIO_MBUF_BURST_SZ 64
+#define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
+uint16_t
+virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+	struct virtqueue *rxvq = rx_queue;
+	struct virtio_hw *hw;
+	struct rte_mbuf *rxm, *new_mbuf;
+	uint16_t nb_used, num, nb_rx;
+	uint32_t len[VIRTIO_MBUF_BURST_SZ];
+	struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+	int error;
+	uint32_t i, nb_enqueued;
+	uint32_t hdr_size;
+
+	nb_used = VIRTQUEUE_NUSED(rxvq);
+
+	virtio_rmb();
+
+	num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
+	num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
+	if (likely(num > DESC_PER_CACHELINE))
+		num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
+
+	num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
+	PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
+
+	hw = rxvq->hw;
+	nb_rx = 0;
+	nb_enqueued = 0;
+	hdr_size = hw->vtnet_hdr_size;
+
+	for (i = 0; i < num ; i++) {
+		rxm = rcv_pkts[i];
+
+		PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
+
+		if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
+			PMD_RX_LOG(ERR, "Packet drop");
+			nb_enqueued++;
+			virtio_discard_rxbuf(rxvq, rxm);
+			rxvq->errors++;
+			continue;
+		}
+
+		rxm->port = rxvq->port_id;
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+		rxm->ol_flags = 0;
+		rxm->vlan_tci = 0;
+
+		rxm->nb_segs = 1;
+		rxm->next = NULL;
+		rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
+		rxm->data_len = (uint16_t)(len[i] - hdr_size);
+
+		if (hw->vlan_strip)
+			rte_vlan_strip(rxm);
+
+		VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
+
+		rx_pkts[nb_rx++] = rxm;
+
+		rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
+		virtio_update_packet_stats(rxvq, rxm);
+	}
+
+	rxvq->packets += nb_rx;
+
+	/* Allocate new mbuf for the used descriptor */
+	error = ENOSPC;
+	while (likely(!virtqueue_full(rxvq))) {
+		new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
+		if (unlikely(new_mbuf == NULL)) {
+			struct rte_eth_dev *dev
+				= &rte_eth_devices[rxvq->port_id];
+			dev->data->rx_mbuf_alloc_failed++;
+			break;
+		}
+		error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
+		if (unlikely(error)) {
+			rte_pktmbuf_free(new_mbuf);
+			break;
+		}
+		nb_enqueued++;
+	}
+
+	if (likely(nb_enqueued)) {
+		vq_update_avail_idx(rxvq);
+
+		if (unlikely(virtqueue_kick_prepare(rxvq))) {
+			virtqueue_notify(rxvq);
+			PMD_RX_LOG(DEBUG, "Notified\n");
+		}
+	}
+
+	return nb_rx;
+}
+
+uint16_t
+virtio_recv_mergeable_pkts(void *rx_queue,
+			struct rte_mbuf **rx_pkts,
+			uint16_t nb_pkts)
+{
+	struct virtqueue *rxvq = rx_queue;
+	struct virtio_hw *hw;
+	struct rte_mbuf *rxm, *new_mbuf;
+	uint16_t nb_used, num, nb_rx;
+	uint32_t len[VIRTIO_MBUF_BURST_SZ];
+	struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+	struct rte_mbuf *prev;
+	int error;
+	uint32_t i, nb_enqueued;
+	uint32_t seg_num;
+	uint16_t extra_idx;
+	uint32_t seg_res;
+	uint32_t hdr_size;
+
+	nb_used = VIRTQUEUE_NUSED(rxvq);
+
+	virtio_rmb();
+
+	PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
+
+	hw = rxvq->hw;
+	nb_rx = 0;
+	i = 0;
+	nb_enqueued = 0;
+	seg_num = 0;
+	extra_idx = 0;
+	seg_res = 0;
+	hdr_size = hw->vtnet_hdr_size;
+
+	while (i < nb_used) {
+		struct virtio_net_hdr_mrg_rxbuf *header;
+
+		if (nb_rx == nb_pkts)
+			break;
+
+		num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
+		if (num != 1)
+			continue;
+
+		i++;
+
+		PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
+		PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
+
+		rxm = rcv_pkts[0];
+
+		if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
+			PMD_RX_LOG(ERR, "Packet drop\n");
+			nb_enqueued++;
+			virtio_discard_rxbuf(rxvq, rxm);
+			rxvq->errors++;
+			continue;
+		}
+
+		header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
+			RTE_PKTMBUF_HEADROOM - hdr_size);
+		seg_num = header->num_buffers;
+
+		if (seg_num == 0)
+			seg_num = 1;
+
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+		rxm->nb_segs = seg_num;
+		rxm->next = NULL;
+		rxm->ol_flags = 0;
+		rxm->vlan_tci = 0;
+		rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
+		rxm->data_len = (uint16_t)(len[0] - hdr_size);
+
+		rxm->port = rxvq->port_id;
+		rx_pkts[nb_rx] = rxm;
+		prev = rxm;
+
+		seg_res = seg_num - 1;
+
+		while (seg_res != 0) {
+			/*
+			 * Get extra segments for current uncompleted packet.
+			 */
+			uint16_t  rcv_cnt =
+				RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
+			if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
+				uint32_t rx_num =
+					virtqueue_dequeue_burst_rx(rxvq,
+					rcv_pkts, len, rcv_cnt);
+				i += rx_num;
+				rcv_cnt = rx_num;
+			} else {
+				PMD_RX_LOG(ERR,
+					"No enough segments for packet.\n");
+				nb_enqueued++;
+				virtio_discard_rxbuf(rxvq, rxm);
+				rxvq->errors++;
+				break;
+			}
+
+			extra_idx = 0;
+
+			while (extra_idx < rcv_cnt) {
+				rxm = rcv_pkts[extra_idx];
+
+				rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
+				rxm->next = NULL;
+				rxm->pkt_len = (uint32_t)(len[extra_idx]);
+				rxm->data_len = (uint16_t)(len[extra_idx]);
+
+				if (prev)
+					prev->next = rxm;
+
+				prev = rxm;
+				rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
+				extra_idx++;
+			};
+			seg_res -= rcv_cnt;
+		}
+
+		if (hw->vlan_strip)
+			rte_vlan_strip(rx_pkts[nb_rx]);
+
+		VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
+			rx_pkts[nb_rx]->data_len);
+
+		rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
+		virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]);
+		nb_rx++;
+	}
+
+	rxvq->packets += nb_rx;
+
+	/* Allocate new mbuf for the used descriptor */
+	error = ENOSPC;
+	while (likely(!virtqueue_full(rxvq))) {
+		new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
+		if (unlikely(new_mbuf == NULL)) {
+			struct rte_eth_dev *dev
+				= &rte_eth_devices[rxvq->port_id];
+			dev->data->rx_mbuf_alloc_failed++;
+			break;
+		}
+		error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
+		if (unlikely(error)) {
+			rte_pktmbuf_free(new_mbuf);
+			break;
+		}
+		nb_enqueued++;
+	}
+
+	if (likely(nb_enqueued)) {
+		vq_update_avail_idx(rxvq);
+
+		if (unlikely(virtqueue_kick_prepare(rxvq))) {
+			virtqueue_notify(rxvq);
+			PMD_RX_LOG(DEBUG, "Notified");
+		}
+	}
+
+	return nb_rx;
+}
+
+uint16_t
+virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+	struct virtqueue *txvq = tx_queue;
+	struct virtio_hw *hw = txvq->hw;
+	uint16_t hdr_size = hw->vtnet_hdr_size;
+	uint16_t nb_used, nb_tx;
+	int error;
+
+	if (unlikely(nb_pkts < 1))
+		return nb_pkts;
+
+	PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
+	nb_used = VIRTQUEUE_NUSED(txvq);
+
+	virtio_rmb();
+	if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh))
+		virtio_xmit_cleanup(txvq, nb_used);
+
+	for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
+		struct rte_mbuf *txm = tx_pkts[nb_tx];
+		int can_push = 0, use_indirect = 0, slots, need;
+
+		/* Do VLAN tag insertion */
+		if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
+			error = rte_vlan_insert(&txm);
+			if (unlikely(error)) {
+				rte_pktmbuf_free(txm);
+				continue;
+			}
+		}
+
+		/* optimize ring usage */
+		if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
+		    rte_mbuf_refcnt_read(txm) == 1 &&
+		    txm->nb_segs == 1 &&
+		    rte_pktmbuf_headroom(txm) >= hdr_size &&
+		    rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
+				   __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
+			can_push = 1;
+		else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
+			 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
+			use_indirect = 1;
+
+		/* How many main ring entries are needed to this Tx?
+		 * any_layout => number of segments
+		 * indirect   => 1
+		 * default    => number of segments + 1
+		 */
+		slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
+		need = slots - txvq->vq_free_cnt;
+
+		/* Positive value indicates it need free vring descriptors */
+		if (unlikely(need > 0)) {
+			nb_used = VIRTQUEUE_NUSED(txvq);
+			virtio_rmb();
+			need = RTE_MIN(need, (int)nb_used);
+
+			virtio_xmit_cleanup(txvq, need);
+			need = slots - txvq->vq_free_cnt;
+			if (unlikely(need > 0)) {
+				PMD_TX_LOG(ERR,
+					   "No free tx descriptors to transmit");
+				break;
+			}
+		}
+
+		/* Enqueue Packet buffers */
+		virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
+
+		txvq->bytes += txm->pkt_len;
+		virtio_update_packet_stats(txvq, txm);
+	}
+
+	txvq->packets += nb_tx;
+
+	if (likely(nb_tx)) {
+		vq_update_avail_idx(txvq);
+
+		if (unlikely(virtqueue_kick_prepare(txvq))) {
+			virtqueue_notify(txvq);
+			PMD_TX_LOG(DEBUG, "Notified backend after xmit");
+		}
+	}
+
+	return nb_tx;
+}
diff --git a/drivers/net/virtio/virtio_rxtx.h b/drivers/net/virtio/virtio_rxtx.h
new file mode 100644
index 00000000..a76c3e52
--- /dev/null
+++ b/drivers/net/virtio/virtio_rxtx.h
@@ -0,0 +1,41 @@
+/*-
+ *   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.
+ */
+
+#define RTE_PMD_VIRTIO_RX_MAX_BURST 64
+
+#ifdef RTE_MACHINE_CPUFLAG_SSSE3
+int virtio_rxq_vec_setup(struct virtqueue *rxq);
+
+int virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
+	struct rte_mbuf *m);
+#endif
diff --git a/drivers/net/virtio/virtio_rxtx_simple.c b/drivers/net/virtio/virtio_rxtx_simple.c
new file mode 100644
index 00000000..8f5293dd
--- /dev/null
+++ b/drivers/net/virtio/virtio_rxtx_simple.c
@@ -0,0 +1,418 @@
+/*-
+ *   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 <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <tmmintrin.h>
+
+#include <rte_cycles.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_branch_prediction.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_string_fns.h>
+#include <rte_errno.h>
+#include <rte_byteorder.h>
+
+#include "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtqueue.h"
+#include "virtio_rxtx.h"
+
+#define RTE_VIRTIO_VPMD_RX_BURST 32
+#define RTE_VIRTIO_DESC_PER_LOOP 8
+#define RTE_VIRTIO_VPMD_RX_REARM_THRESH RTE_VIRTIO_VPMD_RX_BURST
+
+#ifndef __INTEL_COMPILER
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+int __attribute__((cold))
+virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
+	struct rte_mbuf *cookie)
+{
+	struct vq_desc_extra *dxp;
+	struct vring_desc *start_dp;
+	uint16_t desc_idx;
+
+	desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1);
+	dxp = &vq->vq_descx[desc_idx];
+	dxp->cookie = (void *)cookie;
+	vq->sw_ring[desc_idx] = cookie;
+
+	start_dp = vq->vq_ring.desc;
+	start_dp[desc_idx].addr = (uint64_t)((uintptr_t)cookie->buf_physaddr +
+		RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size);
+	start_dp[desc_idx].len = cookie->buf_len -
+		RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size;
+
+	vq->vq_free_cnt--;
+	vq->vq_avail_idx++;
+
+	return 0;
+}
+
+static inline void
+virtio_rxq_rearm_vec(struct virtqueue *rxvq)
+{
+	int i;
+	uint16_t desc_idx;
+	struct rte_mbuf **sw_ring;
+	struct vring_desc *start_dp;
+	int ret;
+
+	desc_idx = rxvq->vq_avail_idx & (rxvq->vq_nentries - 1);
+	sw_ring = &rxvq->sw_ring[desc_idx];
+	start_dp = &rxvq->vq_ring.desc[desc_idx];
+
+	ret = rte_mempool_get_bulk(rxvq->mpool, (void **)sw_ring,
+		RTE_VIRTIO_VPMD_RX_REARM_THRESH);
+	if (unlikely(ret)) {
+		rte_eth_devices[rxvq->port_id].data->rx_mbuf_alloc_failed +=
+			RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+		return;
+	}
+
+	for (i = 0; i < RTE_VIRTIO_VPMD_RX_REARM_THRESH; i++) {
+		uintptr_t p;
+
+		p = (uintptr_t)&sw_ring[i]->rearm_data;
+		*(uint64_t *)p = rxvq->mbuf_initializer;
+
+		start_dp[i].addr =
+			(uint64_t)((uintptr_t)sw_ring[i]->buf_physaddr +
+			RTE_PKTMBUF_HEADROOM - rxvq->hw->vtnet_hdr_size);
+		start_dp[i].len = sw_ring[i]->buf_len -
+			RTE_PKTMBUF_HEADROOM + rxvq->hw->vtnet_hdr_size;
+	}
+
+	rxvq->vq_avail_idx += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+	rxvq->vq_free_cnt -= RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+	vq_update_avail_idx(rxvq);
+}
+
+/* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP)
+ *
+ * This routine is for non-mergeable RX, one desc for each guest buffer.
+ * This routine is based on the RX ring layout optimization. Each entry in the
+ * avail ring points to the desc with the same index in the desc ring and this
+ * will never be changed in the driver.
+ *
+ * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
+ */
+uint16_t
+virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+	uint16_t nb_pkts)
+{
+	struct virtqueue *rxvq = rx_queue;
+	uint16_t nb_used;
+	uint16_t desc_idx;
+	struct vring_used_elem *rused;
+	struct rte_mbuf **sw_ring;
+	struct rte_mbuf **sw_ring_end;
+	uint16_t nb_pkts_received;
+	__m128i shuf_msk1, shuf_msk2, len_adjust;
+
+	shuf_msk1 = _mm_set_epi8(
+		0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF,		/* vlan tci */
+		5, 4,			/* dat len */
+		0xFF, 0xFF, 5, 4,	/* pkt len */
+		0xFF, 0xFF, 0xFF, 0xFF	/* packet type */
+
+	);
+
+	shuf_msk2 = _mm_set_epi8(
+		0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF,		/* vlan tci */
+		13, 12,			/* dat len */
+		0xFF, 0xFF, 13, 12,	/* pkt len */
+		0xFF, 0xFF, 0xFF, 0xFF	/* packet type */
+	);
+
+	/* Subtract the header length.
+	*  In which case do we need the header length in used->len ?
+	*/
+	len_adjust = _mm_set_epi16(
+		0, 0,
+		0,
+		(uint16_t)-rxvq->hw->vtnet_hdr_size,
+		0, (uint16_t)-rxvq->hw->vtnet_hdr_size,
+		0, 0);
+
+	if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))
+		return 0;
+
+	nb_used = *(volatile uint16_t *)&rxvq->vq_ring.used->idx -
+		rxvq->vq_used_cons_idx;
+
+	rte_compiler_barrier();
+
+	if (unlikely(nb_used == 0))
+		return 0;
+
+	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP);
+	nb_used = RTE_MIN(nb_used, nb_pkts);
+
+	desc_idx = (uint16_t)(rxvq->vq_used_cons_idx & (rxvq->vq_nentries - 1));
+	rused = &rxvq->vq_ring.used->ring[desc_idx];
+	sw_ring  = &rxvq->sw_ring[desc_idx];
+	sw_ring_end = &rxvq->sw_ring[rxvq->vq_nentries];
+
+	_mm_prefetch((const void *)rused, _MM_HINT_T0);
+
+	if (rxvq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
+		virtio_rxq_rearm_vec(rxvq);
+		if (unlikely(virtqueue_kick_prepare(rxvq)))
+			virtqueue_notify(rxvq);
+	}
+
+	for (nb_pkts_received = 0;
+		nb_pkts_received < nb_used;) {
+		__m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
+		__m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
+		__m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
+
+		mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0));
+		desc[0] = _mm_loadu_si128((__m128i *)(rused + 0));
+		_mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]);
+
+		mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2));
+		desc[1] = _mm_loadu_si128((__m128i *)(rused + 2));
+		_mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]);
+
+		mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4));
+		desc[2] = _mm_loadu_si128((__m128i *)(rused + 4));
+		_mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]);
+
+		mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6));
+		desc[3] = _mm_loadu_si128((__m128i *)(rused + 6));
+		_mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]);
+
+		pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2);
+		pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1);
+		pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust);
+		pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1,
+			pkt_mb[1]);
+		_mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1,
+			pkt_mb[0]);
+
+		pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2);
+		pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1);
+		pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust);
+		pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1,
+			pkt_mb[3]);
+		_mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1,
+			pkt_mb[2]);
+
+		pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2);
+		pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1);
+		pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust);
+		pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1,
+			pkt_mb[5]);
+		_mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1,
+			pkt_mb[4]);
+
+		pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2);
+		pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1);
+		pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust);
+		pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1,
+			pkt_mb[7]);
+		_mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1,
+			pkt_mb[6]);
+
+		if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) {
+			if (sw_ring + nb_used <= sw_ring_end)
+				nb_pkts_received += nb_used;
+			else
+				nb_pkts_received += sw_ring_end - sw_ring;
+			break;
+		} else {
+			if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >=
+				sw_ring_end)) {
+				nb_pkts_received += sw_ring_end - sw_ring;
+				break;
+			} else {
+				nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP;
+
+				rx_pkts += RTE_VIRTIO_DESC_PER_LOOP;
+				sw_ring += RTE_VIRTIO_DESC_PER_LOOP;
+				rused   += RTE_VIRTIO_DESC_PER_LOOP;
+				nb_used -= RTE_VIRTIO_DESC_PER_LOOP;
+			}
+		}
+	}
+
+	rxvq->vq_used_cons_idx += nb_pkts_received;
+	rxvq->vq_free_cnt += nb_pkts_received;
+	rxvq->packets += nb_pkts_received;
+	return nb_pkts_received;
+}
+
+#define VIRTIO_TX_FREE_THRESH 32
+#define VIRTIO_TX_MAX_FREE_BUF_SZ 32
+#define VIRTIO_TX_FREE_NR 32
+/* TODO: vq->tx_free_cnt could mean num of free slots so we could avoid shift */
+static inline void
+virtio_xmit_cleanup(struct virtqueue *vq)
+{
+	uint16_t i, desc_idx;
+	int nb_free = 0;
+	struct rte_mbuf *m, *free[VIRTIO_TX_MAX_FREE_BUF_SZ];
+
+	desc_idx = (uint16_t)(vq->vq_used_cons_idx &
+		   ((vq->vq_nentries >> 1) - 1));
+	m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+	m = __rte_pktmbuf_prefree_seg(m);
+	if (likely(m != NULL)) {
+		free[0] = m;
+		nb_free = 1;
+		for (i = 1; i < VIRTIO_TX_FREE_NR; i++) {
+			m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+			m = __rte_pktmbuf_prefree_seg(m);
+			if (likely(m != NULL)) {
+				if (likely(m->pool == free[0]->pool))
+					free[nb_free++] = m;
+				else {
+					rte_mempool_put_bulk(free[0]->pool,
+						(void **)free, nb_free);
+					free[0] = m;
+					nb_free = 1;
+				}
+			}
+		}
+		rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
+	} else {
+		for (i = 1; i < VIRTIO_TX_FREE_NR; i++) {
+			m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+			m = __rte_pktmbuf_prefree_seg(m);
+			if (m != NULL)
+				rte_mempool_put(m->pool, m);
+		}
+	}
+
+	vq->vq_used_cons_idx += VIRTIO_TX_FREE_NR;
+	vq->vq_free_cnt += (VIRTIO_TX_FREE_NR << 1);
+}
+
+uint16_t
+virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
+	uint16_t nb_pkts)
+{
+	struct virtqueue *txvq = tx_queue;
+	uint16_t nb_used;
+	uint16_t desc_idx;
+	struct vring_desc *start_dp;
+	uint16_t nb_tail, nb_commit;
+	int i;
+	uint16_t desc_idx_max = (txvq->vq_nentries >> 1) - 1;
+
+	nb_used = VIRTQUEUE_NUSED(txvq);
+	rte_compiler_barrier();
+
+	if (nb_used >= VIRTIO_TX_FREE_THRESH)
+		virtio_xmit_cleanup(tx_queue);
+
+	nb_commit = nb_pkts = RTE_MIN((txvq->vq_free_cnt >> 1), nb_pkts);
+	desc_idx = (uint16_t) (txvq->vq_avail_idx & desc_idx_max);
+	start_dp = txvq->vq_ring.desc;
+	nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx);
+
+	if (nb_commit >= nb_tail) {
+		for (i = 0; i < nb_tail; i++)
+			txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
+		for (i = 0; i < nb_tail; i++) {
+			start_dp[desc_idx].addr =
+				rte_mbuf_data_dma_addr(*tx_pkts);
+			start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
+			tx_pkts++;
+			desc_idx++;
+		}
+		nb_commit -= nb_tail;
+		desc_idx = 0;
+	}
+	for (i = 0; i < nb_commit; i++)
+		txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
+	for (i = 0; i < nb_commit; i++) {
+		start_dp[desc_idx].addr = rte_mbuf_data_dma_addr(*tx_pkts);
+		start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
+		tx_pkts++;
+		desc_idx++;
+	}
+
+	rte_compiler_barrier();
+
+	txvq->vq_free_cnt -= (uint16_t)(nb_pkts << 1);
+	txvq->vq_avail_idx += nb_pkts;
+	txvq->vq_ring.avail->idx = txvq->vq_avail_idx;
+	txvq->packets += nb_pkts;
+
+	if (likely(nb_pkts)) {
+		if (unlikely(virtqueue_kick_prepare(txvq)))
+			virtqueue_notify(txvq);
+	}
+
+	return nb_pkts;
+}
+
+int __attribute__((cold))
+virtio_rxq_vec_setup(struct virtqueue *rxq)
+{
+	uintptr_t p;
+	struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
+
+	mb_def.nb_segs = 1;
+	mb_def.data_off = RTE_PKTMBUF_HEADROOM;
+	mb_def.port = rxq->port_id;
+	rte_mbuf_refcnt_set(&mb_def, 1);
+
+	/* prevent compiler reordering: rearm_data covers previous fields */
+	rte_compiler_barrier();
+	p = (uintptr_t)&mb_def.rearm_data;
+	rxq->mbuf_initializer = *(uint64_t *)p;
+
+	return 0;
+}
diff --git a/drivers/net/virtio/virtqueue.c b/drivers/net/virtio/virtqueue.c
new file mode 100644
index 00000000..7f60e3ef
--- /dev/null
+++ b/drivers/net/virtio/virtqueue.c
@@ -0,0 +1,72 @@
+/*-
+ *   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 <stdint.h>
+
+#include <rte_mbuf.h>
+
+#include "virtqueue.h"
+#include "virtio_logs.h"
+#include "virtio_pci.h"
+
+void
+virtqueue_disable_intr(struct virtqueue *vq)
+{
+	/*
+	 * Set VRING_AVAIL_F_NO_INTERRUPT to hint host
+	 * not to interrupt when it consumes packets
+	 * Note: this is only considered a hint to the host
+	 */
+	vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+}
+
+/*
+ * Two types of mbuf to be cleaned:
+ * 1) mbuf that has been consumed by backend but not used by virtio.
+ * 2) mbuf that hasn't been consued by backend.
+ */
+struct rte_mbuf *
+virtqueue_detatch_unused(struct virtqueue *vq)
+{
+	struct rte_mbuf *cookie;
+	int idx;
+
+	if (vq != NULL)
+		for (idx = 0; idx < vq->vq_nentries; idx++) {
+			cookie = vq->vq_descx[idx].cookie;
+			if (cookie != NULL) {
+				vq->vq_descx[idx].cookie = NULL;
+				return cookie;
+			}
+		}
+	return NULL;
+}
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
new file mode 100644
index 00000000..4e9239e0
--- /dev/null
+++ b/drivers/net/virtio/virtqueue.h
@@ -0,0 +1,344 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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.
+ */
+
+#ifndef _VIRTQUEUE_H_
+#define _VIRTQUEUE_H_
+
+#include <stdint.h>
+
+#include <rte_atomic.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_mempool.h>
+
+#include "virtio_pci.h"
+#include "virtio_ring.h"
+#include "virtio_logs.h"
+
+struct rte_mbuf;
+
+/*
+ * Per virtio_config.h in Linux.
+ *     For virtio_pci on SMP, we don't need to order with respect to MMIO
+ *     accesses through relaxed memory I/O windows, so smp_mb() et al are
+ *     sufficient.
+ *
+ */
+#define virtio_mb()	rte_smp_mb()
+#define virtio_rmb()	rte_smp_rmb()
+#define virtio_wmb()	rte_smp_wmb()
+
+#ifdef RTE_PMD_PACKET_PREFETCH
+#define rte_packet_prefetch(p)  rte_prefetch1(p)
+#else
+#define rte_packet_prefetch(p)  do {} while(0)
+#endif
+
+#define VIRTQUEUE_MAX_NAME_SZ 32
+
+#define VTNET_SQ_RQ_QUEUE_IDX 0
+#define VTNET_SQ_TQ_QUEUE_IDX 1
+#define VTNET_SQ_CQ_QUEUE_IDX 2
+
+enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
+/**
+ * The maximum virtqueue size is 2^15. Use that value as the end of
+ * descriptor chain terminator since it will never be a valid index
+ * in the descriptor table. This is used to verify we are correctly
+ * handling vq_free_cnt.
+ */
+#define VQ_RING_DESC_CHAIN_END 32768
+
+/**
+ * Control the RX mode, ie. promiscuous, allmulti, etc...
+ * All commands require an "out" sg entry containing a 1 byte
+ * state value, zero = disable, non-zero = enable.  Commands
+ * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
+ * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
+ */
+#define VIRTIO_NET_CTRL_RX              0
+#define VIRTIO_NET_CTRL_RX_PROMISC      0
+#define VIRTIO_NET_CTRL_RX_ALLMULTI     1
+#define VIRTIO_NET_CTRL_RX_ALLUNI       2
+#define VIRTIO_NET_CTRL_RX_NOMULTI      3
+#define VIRTIO_NET_CTRL_RX_NOUNI        4
+#define VIRTIO_NET_CTRL_RX_NOBCAST      5
+
+/**
+ * Control the MAC
+ *
+ * The MAC filter table is managed by the hypervisor, the guest should
+ * assume the size is infinite.  Filtering should be considered
+ * non-perfect, ie. based on hypervisor resources, the guest may
+ * received packets from sources not specified in the filter list.
+ *
+ * In addition to the class/cmd header, the TABLE_SET command requires
+ * two out scatterlists.  Each contains a 4 byte count of entries followed
+ * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
+ * first sg list contains unicast addresses, the second is for multicast.
+ * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
+ * is available.
+ *
+ * The ADDR_SET command requests one out scatterlist, it contains a
+ * 6 bytes MAC address. This functionality is present if the
+ * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
+ */
+struct virtio_net_ctrl_mac {
+	uint32_t entries;
+	uint8_t macs[][ETHER_ADDR_LEN];
+} __attribute__((__packed__));
+
+#define VIRTIO_NET_CTRL_MAC    1
+ #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
+ #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
+
+/**
+ * Control VLAN filtering
+ *
+ * The VLAN filter table is controlled via a simple ADD/DEL interface.
+ * VLAN IDs not added may be filtered by the hypervisor.  Del is the
+ * opposite of add.  Both commands expect an out entry containing a 2
+ * byte VLAN ID.  VLAN filtering is available with the
+ * VIRTIO_NET_F_CTRL_VLAN feature bit.
+ */
+#define VIRTIO_NET_CTRL_VLAN     2
+#define VIRTIO_NET_CTRL_VLAN_ADD 0
+#define VIRTIO_NET_CTRL_VLAN_DEL 1
+
+struct virtio_net_ctrl_hdr {
+	uint8_t class;
+	uint8_t cmd;
+} __attribute__((packed));
+
+typedef uint8_t virtio_net_ctrl_ack;
+
+#define VIRTIO_NET_OK     0
+#define VIRTIO_NET_ERR    1
+
+#define VIRTIO_MAX_CTRL_DATA 2048
+
+struct virtio_pmd_ctrl {
+	struct virtio_net_ctrl_hdr hdr;
+	virtio_net_ctrl_ack status;
+	uint8_t data[VIRTIO_MAX_CTRL_DATA];
+};
+
+struct virtqueue {
+	struct virtio_hw         *hw;     /**< virtio_hw structure pointer. */
+	const struct rte_memzone *mz;     /**< mem zone to populate RX ring. */
+	const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */
+	struct rte_mempool       *mpool;  /**< mempool for mbuf allocation */
+	uint16_t    queue_id;             /**< DPDK queue index. */
+	uint8_t     port_id;              /**< Device port identifier. */
+	uint16_t    vq_queue_index;       /**< PCI queue index */
+
+	void        *vq_ring_virt_mem;    /**< linear address of vring*/
+	unsigned int vq_ring_size;
+	phys_addr_t vq_ring_mem;          /**< physical address of vring */
+
+	struct vring vq_ring;    /**< vring keeping desc, used and avail */
+	uint16_t    vq_free_cnt; /**< num of desc available */
+	uint16_t    vq_nentries; /**< vring desc numbers */
+	uint16_t    vq_free_thresh; /**< free threshold */
+	/**
+	 * Head of the free chain in the descriptor table. If
+	 * there are no free descriptors, this will be set to
+	 * VQ_RING_DESC_CHAIN_END.
+	 */
+	uint16_t  vq_desc_head_idx;
+	uint16_t  vq_desc_tail_idx;
+	/**
+	 * Last consumed descriptor in the used table,
+	 * trails vq_ring.used->idx.
+	 */
+	uint16_t vq_used_cons_idx;
+	uint16_t vq_avail_idx;
+	uint64_t mbuf_initializer; /**< value to init mbufs. */
+	phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */
+
+	struct rte_mbuf **sw_ring; /**< RX software ring. */
+	/* dummy mbuf, for wraparound when processing RX ring. */
+	struct rte_mbuf fake_mbuf;
+
+	/* Statistics */
+	uint64_t	packets;
+	uint64_t	bytes;
+	uint64_t	errors;
+	uint64_t	multicast;
+	uint64_t	broadcast;
+	/* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
+	uint64_t	size_bins[8];
+
+	uint16_t	*notify_addr;
+
+	struct vq_desc_extra {
+		void              *cookie;
+		uint16_t          ndescs;
+	} vq_descx[0];
+};
+
+/* If multiqueue is provided by host, then we suppport it. */
+#define VIRTIO_NET_CTRL_MQ   4
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
+
+#define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
+
+/**
+ * This is the first element of the scatter-gather list.  If you don't
+ * specify GSO or CSUM features, you can simply ignore the header.
+ */
+struct virtio_net_hdr {
+#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1    /**< Use csum_start,csum_offset*/
+	uint8_t flags;
+#define VIRTIO_NET_HDR_GSO_NONE     0    /**< Not a GSO frame */
+#define VIRTIO_NET_HDR_GSO_TCPV4    1    /**< GSO frame, IPv4 TCP (TSO) */
+#define VIRTIO_NET_HDR_GSO_UDP      3    /**< GSO frame, IPv4 UDP (UFO) */
+#define VIRTIO_NET_HDR_GSO_TCPV6    4    /**< GSO frame, IPv6 TCP */
+#define VIRTIO_NET_HDR_GSO_ECN      0x80 /**< TCP has ECN set */
+	uint8_t gso_type;
+	uint16_t hdr_len;     /**< Ethernet + IP + tcp/udp hdrs */
+	uint16_t gso_size;    /**< Bytes to append to hdr_len per frame */
+	uint16_t csum_start;  /**< Position to start checksumming from */
+	uint16_t csum_offset; /**< Offset after that to place checksum */
+};
+
+/**
+ * This is the version of the header to use when the MRG_RXBUF
+ * feature has been negotiated.
+ */
+struct virtio_net_hdr_mrg_rxbuf {
+	struct   virtio_net_hdr hdr;
+	uint16_t num_buffers; /**< Number of merged rx buffers */
+};
+
+/* Region reserved to allow for transmit header and indirect ring */
+#define VIRTIO_MAX_TX_INDIRECT 8
+struct virtio_tx_region {
+	struct virtio_net_hdr_mrg_rxbuf tx_hdr;
+	struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
+			   __attribute__((__aligned__(16)));
+};
+
+/* Chain all the descriptors in the ring with an END */
+static inline void
+vring_desc_init(struct vring_desc *dp, uint16_t n)
+{
+	uint16_t i;
+
+	for (i = 0; i < n - 1; i++)
+		dp[i].next = (uint16_t)(i + 1);
+	dp[i].next = VQ_RING_DESC_CHAIN_END;
+}
+
+/**
+ * Tell the backend not to interrupt us.
+ */
+void virtqueue_disable_intr(struct virtqueue *vq);
+/**
+ *  Dump virtqueue internal structures, for debug purpose only.
+ */
+void virtqueue_dump(struct virtqueue *vq);
+/**
+ *  Get all mbufs to be freed.
+ */
+struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq);
+
+static inline int
+virtqueue_full(const struct virtqueue *vq)
+{
+	return vq->vq_free_cnt == 0;
+}
+
+#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
+
+static inline void
+vq_update_avail_idx(struct virtqueue *vq)
+{
+	virtio_wmb();
+	vq->vq_ring.avail->idx = vq->vq_avail_idx;
+}
+
+static inline void
+vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
+{
+	uint16_t avail_idx;
+	/*
+	 * Place the head of the descriptor chain into the next slot and make
+	 * it usable to the host. The chain is made available now rather than
+	 * deferring to virtqueue_notify() in the hopes that if the host is
+	 * currently running on another CPU, we can keep it processing the new
+	 * descriptor.
+	 */
+	avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
+	vq->vq_ring.avail->ring[avail_idx] = desc_idx;
+	vq->vq_avail_idx++;
+}
+
+static inline int
+virtqueue_kick_prepare(struct virtqueue *vq)
+{
+	return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
+}
+
+static inline void
+virtqueue_notify(struct virtqueue *vq)
+{
+	/*
+	 * Ensure updated avail->idx is visible to host.
+	 * For virtio on IA, the notificaiton is through io port operation
+	 * which is a serialization instruction itself.
+	 */
+	vq->hw->vtpci_ops->notify_queue(vq->hw, vq);
+}
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
+#define VIRTQUEUE_DUMP(vq) do { \
+	uint16_t used_idx, nused; \
+	used_idx = (vq)->vq_ring.used->idx; \
+	nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
+	PMD_INIT_LOG(DEBUG, \
+	  "VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
+	  " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
+	  " avail.flags=0x%x; used.flags=0x%x", \
+	  (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
+	  (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
+	  (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
+	  (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
+} while (0)
+#else
+#define VIRTQUEUE_DUMP(vq) do { } while (0)
+#endif
+
+#endif /* _VIRTQUEUE_H_ */