first version

10 files changed, 3126 insertions, 0 deletions

diff --git a/src/dpdk_lib18/librte_pmd_virtio/Makefile b/src/dpdk_lib18/librte_pmd_virtio/Makefile
new file mode 100755
index 00000000..456095b3
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/Makefile
@@ -0,0 +1,57 @@
+#   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_uio.a
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-$(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-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
+
+
+# this lib depends upon:
+DEPDIRS-$(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 lib/librte_malloc
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.c b/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.c
new file mode 100755
index 00000000..b3b5bb6a
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.c
@@ -0,0 +1,1209 @@
+/*-
+ *   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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#ifdef RTE_EXEC_ENV_LINUXAPP
+#include <dirent.h>
+#endif
+
+#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_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"
+
+
+static int eth_virtio_dev_init(struct eth_driver *eth_drv,
+		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_rx_queue_release(__rte_unused void *rxq);
+static void virtio_dev_tx_queue_release(__rte_unused void *txq);
+
+static void virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats);
+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_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 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 */ },
+};
+
+static int
+virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
+		int *dlen, int pkt_num)
+{
+	uint32_t head = vq->vq_desc_head_idx, i;
+	int k, sum = 0;
+	virtio_net_ctrl_ack status = ~0;
+	struct virtio_pmd_ctrl result;
+
+	ctrl->status = status;
+
+	if (!vq->hw->cvq) {
+		PMD_INIT_LOG(ERR,
+			     "%s(): Control queue is not supported.",
+			     __func__);
+		return -1;
+	}
+
+	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);
+
+	while (vq->vq_used_cons_idx == vq->vq_ring.used->idx)
+		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;
+
+		rmb();
+
+		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
+		= VIRTIO_DEV_PRIVATE_TO_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;
+}
+
+int virtio_dev_queue_setup(struct rte_eth_dev *dev,
+			int queue_type,
+			uint16_t queue_idx,
+			uint8_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;
+	uint16_t vq_size;
+	int size;
+	struct virtio_hw *hw =
+		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtqueue  *vq = NULL;
+
+	/* Write the virtqueue index to the Queue Select Field */
+	VIRTIO_WRITE_REG_2(hw, VIRTIO_PCI_QUEUE_SEL, vtpci_queue_idx);
+	PMD_INIT_LOG(DEBUG, "selecting queue: %d", 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 = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM);
+	PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d", vq_size, nb_desc);
+	if (nb_desc == 0)
+		nb_desc = vq_size;
+	if (vq_size == 0) {
+		PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__);
+		return -EINVAL;
+	} else if (!rte_is_power_of_2(vq_size)) {
+		PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2", __func__);
+		return -EINVAL;
+	} else if (nb_desc != vq_size) {
+		PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size",
+			nb_desc, vq_size);
+		nb_desc = vq_size;
+	}
+
+	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);
+	} 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, "%s: Can not allocate virtqueue", __func__);
+		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_alignment = VIRTIO_PCI_VRING_ALIGN;
+	vq->vq_nentries = vq_size;
+	vq->vq_free_cnt = vq_size;
+
+	/*
+	 * 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) {
+		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)mz->addr);
+	vq->virtio_net_hdr_mz  = NULL;
+	vq->virtio_net_hdr_mem = 0;
+
+	if (queue_type == VTNET_TQ) {
+		/*
+		 * For each xmit packet, allocate a virtio_net_hdr
+		 */
+		snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
+			dev->data->port_id, queue_idx);
+		vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
+			vq_size * hw->vtnet_hdr_size,
+			socket_id, 0, RTE_CACHE_LINE_SIZE);
+		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,
+			vq_size * hw->vtnet_hdr_size);
+	} 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) {
+			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);
+	}
+
+	/*
+	 * Set guest physical address of the virtqueue
+	 * in VIRTIO_PCI_QUEUE_PFN config register of device
+	 */
+	VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
+			mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+	*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;
+	uint16_t nb_desc = 0;
+	int ret;
+	struct virtio_hw *hw =
+		VIRTIO_DEV_PRIVATE_TO_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, nb_desc, socket_id, &vq);
+
+	if (ret < 0) {
+		PMD_INIT_LOG(ERR, "control vq initialization failed");
+		return ret;
+	}
+
+	hw->cvq = vq;
+	return 0;
+}
+
+static void
+virtio_dev_close(struct rte_eth_dev *dev)
+{
+	PMD_INIT_LOG(DEBUG, "virtio_dev_close");
+
+	virtio_dev_stop(dev);
+}
+
+static void
+virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw
+		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	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
+		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	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
+		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	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
+		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_pmd_ctrl ctrl;
+	int dlen[1];
+	int ret;
+
+	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 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,
+	.stats_reset             = virtio_dev_stats_reset,
+	.link_update             = virtio_dev_link_update,
+	.mac_addr_add            = NULL,
+	.mac_addr_remove         = NULL,
+	.rx_queue_setup          = virtio_dev_rx_queue_setup,
+	/* meaningfull only to multiple queue */
+	.rx_queue_release        = virtio_dev_rx_queue_release,
+	.tx_queue_setup          = virtio_dev_tx_queue_setup,
+	/* meaningfull only to multiple queue */
+	.tx_queue_release        = virtio_dev_tx_queue_release,
+	/* collect stats per queue */
+	.queue_stats_mapping_set = virtio_dev_queue_stats_mapping_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_dev_stats_get(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 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;
+	}
+
+	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;
+	}
+
+	dev->data->rx_mbuf_alloc_failed = 0;
+}
+
+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_negotiate_features(struct virtio_hw *hw)
+{
+	uint32_t host_features, mask;
+
+	mask = VIRTIO_NET_F_CTRL_VLAN;
+	mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
+
+	/* TSO and LRO are only available when their corresponding
+	 * checksum offload feature is also negotiated.
+	 */
+	mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
+	mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
+	mask |= VTNET_LRO_FEATURES;
+
+	/* not negotiating INDIRECT descriptor table support */
+	mask |= VIRTIO_RING_F_INDIRECT_DESC;
+
+	/* Prepare guest_features: feature that driver wants to support */
+	hw->guest_features = VTNET_FEATURES & ~mask;
+	PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
+		hw->guest_features);
+
+	/* Read device(host) feature bits */
+	host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
+	PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
+		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 = %x",
+		hw->guest_features);
+}
+
+#ifdef RTE_EXEC_ENV_LINUXAPP
+static int
+parse_sysfs_value(const char *filename, unsigned long *val)
+{
+	FILE *f;
+	char buf[BUFSIZ];
+	char *end = NULL;
+
+	f = fopen(filename, "r");
+	if (f == NULL) {
+		PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
+			     __func__, filename);
+		return -1;
+	}
+
+	if (fgets(buf, sizeof(buf), f) == NULL) {
+		PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
+			     __func__, filename);
+		fclose(f);
+		return -1;
+	}
+	*val = strtoul(buf, &end, 0);
+	if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
+		PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
+			     __func__, filename);
+		fclose(f);
+		return -1;
+	}
+	fclose(f);
+	return 0;
+}
+
+static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
+{
+	unsigned int uio_num;
+	struct dirent *e;
+	DIR *dir;
+	char dirname[PATH_MAX];
+
+	/* depending on kernel version, uio can be located in uio/uioX
+	 * or uio:uioX */
+	snprintf(dirname, sizeof(dirname),
+		     SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
+		     loc->domain, loc->bus, loc->devid, loc->function);
+	dir = opendir(dirname);
+	if (dir == NULL) {
+		/* retry with the parent directory */
+		snprintf(dirname, sizeof(dirname),
+			     SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
+			     loc->domain, loc->bus, loc->devid, loc->function);
+		dir = opendir(dirname);
+
+		if (dir == NULL) {
+			PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
+			return -1;
+		}
+	}
+
+	/* take the first file starting with "uio" */
+	while ((e = readdir(dir)) != NULL) {
+		/* format could be uio%d ...*/
+		int shortprefix_len = sizeof("uio") - 1;
+		/* ... or uio:uio%d */
+		int longprefix_len = sizeof("uio:uio") - 1;
+		char *endptr;
+
+		if (strncmp(e->d_name, "uio", 3) != 0)
+			continue;
+
+		/* first try uio%d */
+		errno = 0;
+		uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
+		if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
+			snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
+			break;
+		}
+
+		/* then try uio:uio%d */
+		errno = 0;
+		uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
+		if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
+			snprintf(buf, buflen, "%s/uio:uio%u", dirname,
+				     uio_num);
+			break;
+		}
+	}
+	closedir(dir);
+
+	/* No uio resource found */
+	if (e == NULL) {
+		PMD_INIT_LOG(ERR, "Could not find uio resource");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+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
+virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
+{
+	/* nic_uio does not enable interrupts, return 0 (false). */
+	return 0;
+}
+#endif
+
+/*
+ * This function is based on probe() function in virtio_pci.c
+ * It returns 0 on success.
+ */
+static int
+eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
+		struct rte_eth_dev *eth_dev)
+{
+	struct virtio_net_config *config;
+	struct virtio_net_config local_config;
+	uint32_t offset_conf = sizeof(config->mac);
+	struct rte_pci_device *pci_dev;
+	struct virtio_hw *hw =
+		VIRTIO_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
+
+	if (RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr)) {
+		PMD_INIT_LOG(ERR,
+			"MBUF HEADROOM should be enough to hold virtio net hdr\n");
+		return -1;
+	}
+
+	eth_dev->dev_ops = &virtio_eth_dev_ops;
+	eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
+
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+		return 0;
+
+	pci_dev = eth_dev->pci_dev;
+
+#ifdef RTE_EXEC_ENV_LINUXAPP
+	{
+		char dirname[PATH_MAX];
+		char filename[PATH_MAX];
+		unsigned long start, size;
+
+		if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
+			return -1;
+
+		/* get portio size */
+		snprintf(filename, sizeof(filename),
+			     "%s/portio/port0/size", dirname);
+		if (parse_sysfs_value(filename, &size) < 0) {
+			PMD_INIT_LOG(ERR, "%s(): cannot parse size",
+				     __func__);
+			return -1;
+		}
+
+		/* get portio start */
+		snprintf(filename, sizeof(filename),
+			     "%s/portio/port0/start", dirname);
+		if (parse_sysfs_value(filename, &start) < 0) {
+			PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
+				     __func__);
+			return -1;
+		}
+		pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
+		pci_dev->mem_resource[0].len =  (uint64_t)size;
+		PMD_INIT_LOG(DEBUG,
+			     "PCI Port IO found start=0x%lx with size=0x%lx",
+			     start, size);
+	}
+#endif
+	hw->use_msix = virtio_has_msix(&pci_dev->addr);
+	hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
+
+	/* 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);
+	virtio_negotiate_features(hw);
+
+	/* Setting up rx_header size for the device */
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+		eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
+		hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	} else {
+		eth_dev->rx_pkt_burst = &virtio_recv_pkts;
+		hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
+	}
+
+	/* Allocate memory for storing MAC addresses */
+	eth_dev->data->mac_addrs = rte_zmalloc("virtio", 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",
+			ETHER_ADDR_LEN);
+		return -ENOMEM;
+	}
+
+	/* 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;
+
+		if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+			offset_conf += 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)) {
+			offset_conf += sizeof(config->max_virtqueue_pairs);
+		} else {
+			PMD_INIT_LOG(DEBUG,
+				     "VIRTIO_NET_F_MQ is not supported");
+			config->max_virtqueue_pairs = 1;
+		}
+
+		vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
+
+		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;
+	}
+
+	eth_dev->data->nb_rx_queues = hw->max_rx_queues;
+	eth_dev->data->nb_tx_queues = hw->max_tx_queues;
+
+	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);
+	return 0;
+}
+
+static struct eth_driver rte_virtio_pmd = {
+	{
+		.name = "rte_virtio_pmd",
+		.id_table = pci_id_virtio_map,
+		.drv_flags = RTE_PCI_DRV_NEED_MAPPING,
+	},
+	.eth_dev_init = eth_virtio_dev_init,
+	.dev_private_size = sizeof(struct virtio_adapter),
+};
+
+/*
+ * 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;
+}
+
+/*
+ * Only 1 queue is supported, no queue release related operation
+ */
+static void
+virtio_dev_rx_queue_release(__rte_unused void *rxq)
+{
+}
+
+static void
+virtio_dev_tx_queue_release(__rte_unused void *txq)
+{
+}
+
+/*
+ * 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;
+
+	PMD_INIT_LOG(DEBUG, "configure");
+
+	if (rxmode->hw_ip_checksum) {
+		PMD_DRV_LOG(ERR, "HW IP checksum not supported");
+		return (-EINVAL);
+	}
+
+	return 0;
+}
+
+
+static int
+virtio_dev_start(struct rte_eth_dev *dev)
+{
+	uint16_t nb_queues, i;
+	uint16_t status;
+	struct virtio_hw *hw =
+		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/* 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);
+
+	virtio_dev_cq_start(dev);
+
+	/* Do final configuration before rx/tx engine starts */
+	virtio_dev_rxtx_start(dev);
+
+	/* Check VIRTIO_NET_F_STATUS for link status*/
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+		vtpci_read_dev_config(hw,
+				offsetof(struct virtio_net_config, status),
+				&status, sizeof(status));
+		if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
+			PMD_INIT_LOG(ERR, "Port: %d Link is DOWN",
+				     dev->data->port_id);
+			return -EIO;
+		} else {
+			PMD_INIT_LOG(DEBUG, "Port: %d Link is UP",
+				     dev->data->port_id);
+		}
+	}
+	vtpci_reinit_complete(hw);
+
+	/*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]);
+
+		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 rx and tx functions to allow for reconfiguring.
+ */
+static void
+virtio_dev_stop(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw =
+		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/* reset the NIC */
+	vtpci_reset(hw);
+	virtio_dev_free_mbufs(dev);
+}
+
+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 =
+		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	memset(&link, 0, sizeof(link));
+	virtio_dev_atomic_read_link_status(dev, &link);
+	old = link;
+	link.link_duplex = 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 = 0;
+			PMD_INIT_LOG(DEBUG, "Port %d is down",
+				     dev->data->port_id);
+		} else {
+			link.link_status = 1;
+			PMD_INIT_LOG(DEBUG, "Port %d is up",
+				     dev->data->port_id);
+		}
+	} else {
+		link.link_status = 1;   /* Link up */
+	}
+	virtio_dev_atomic_write_link_status(dev, &link);
+	if (old.link_status == link.link_status)
+		return -1;
+	/*changed*/
+	return 0;
+}
+
+static void
+virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+{
+	struct virtio_hw *hw = VIRTIO_DEV_PRIVATE_TO_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;
+}
+
+/*
+ * 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/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.h b/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.h
new file mode 100755
index 00000000..1da3c625
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtio_ethdev.h
@@ -0,0 +1,132 @@
+/*-
+ *   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_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
+#define HALF_DUPLEX	1
+#define FULL_DUPLEX	2
+
+#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 1
+#define VIRTIO_MIN_RX_BUFSIZE 64
+#define VIRTIO_MAX_RX_PKTLEN  9728
+
+/* Features desired/implemented by this driver. */
+#define VTNET_FEATURES \
+	(VIRTIO_NET_F_MAC       | \
+	VIRTIO_NET_F_STATUS     | \
+	VIRTIO_NET_F_MQ         | \
+	VIRTIO_NET_F_CTRL_VQ    | \
+	VIRTIO_NET_F_CTRL_RX    | \
+	VIRTIO_NET_F_CTRL_VLAN  | \
+	VIRTIO_NET_F_CSUM       | \
+	VIRTIO_NET_F_HOST_TSO4  | \
+	VIRTIO_NET_F_HOST_TSO6  | \
+	VIRTIO_NET_F_HOST_ECN   | \
+	VIRTIO_NET_F_GUEST_CSUM | \
+	VIRTIO_NET_F_GUEST_TSO4 | \
+	VIRTIO_NET_F_GUEST_TSO6 | \
+	VIRTIO_NET_F_GUEST_ECN  | \
+	VIRTIO_NET_F_MRG_RXBUF  | \
+	VIRTIO_RING_F_INDIRECT_DESC)
+
+/*
+ * 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,
+			uint8_t  vtpci_queue_idx,
+			uint16_t nb_desc,
+			unsigned int socket_id,
+			struct virtqueue **pvq);
+
+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);
+
+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);
+
+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);
+
+/*
+ * Structure to store private data for each driver instance (for each port).
+ */
+struct virtio_adapter {
+	struct virtio_hw hw;
+};
+
+#define VIRTIO_DEV_PRIVATE_TO_HW(adapter)\
+	(&((struct virtio_adapter *)adapter)->hw)
+
+/*
+ * 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/src/dpdk_lib18/librte_pmd_virtio/virtio_logs.h b/src/dpdk_lib18/librte_pmd_virtio/virtio_logs.h
new file mode 100755
index 00000000..d6c33f7b
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_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/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.c b/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.c
new file mode 100755
index 00000000..ca9c7482
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.c
@@ -0,0 +1,129 @@
+/*-
+ *   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 "virtio_pci.h"
+#include "virtio_logs.h"
+
+void
+vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
+		void *dst, int length)
+{
+	uint64_t off;
+	uint8_t *d;
+	int size;
+
+	off = VIRTIO_PCI_CONFIG(hw) + offset;
+	for (d = dst; length > 0; d += size, off += size, length -= size) {
+		if (length >= 4) {
+			size = 4;
+			*(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
+		} else if (length >= 2) {
+			size = 2;
+			*(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
+		} else {
+			size = 1;
+			*d = VIRTIO_READ_REG_1(hw, off);
+		}
+	}
+}
+
+void
+vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
+		void *src, int length)
+{
+	uint64_t off;
+	uint8_t *s;
+	int size;
+
+	off = VIRTIO_PCI_CONFIG(hw) + offset;
+	for (s = src; length > 0; s += size, off += size, length -= size) {
+		if (length >= 4) {
+			size = 4;
+			VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
+		} else if (length >= 2) {
+			size = 2;
+			VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
+		} else {
+			size = 1;
+			VIRTIO_WRITE_REG_1(hw, off, *s);
+		}
+	}
+}
+
+uint32_t
+vtpci_negotiate_features(struct virtio_hw *hw, uint32_t host_features)
+{
+	uint32_t features;
+	/*
+	 * Limit negotiated features to what the driver, virtqueue, and
+	 * host all support.
+	 */
+	features = host_features & hw->guest_features;
+
+	VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
+	return features;
+}
+
+
+void
+vtpci_reset(struct virtio_hw *hw)
+{
+	/*
+	 * Setting the status to RESET sets the host device to
+	 * the original, uninitialized state.
+	 */
+	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
+	vtpci_get_status(hw);
+}
+
+void
+vtpci_reinit_complete(struct virtio_hw *hw)
+{
+	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
+}
+
+uint8_t
+vtpci_get_status(struct virtio_hw *hw)
+{
+	return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS);
+}
+
+void
+vtpci_set_status(struct virtio_hw *hw, uint8_t status)
+{
+	if (status != VIRTIO_CONFIG_STATUS_RESET)
+		status = (uint8_t)(status | vtpci_get_status(hw));
+
+	VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
+}
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.h b/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.h
new file mode 100755
index 00000000..373f9dcb
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtio_pci.h
@@ -0,0 +1,266 @@
+/*-
+ *   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>
+
+#ifdef __FreeBSD__
+#include <sys/types.h>
+#include <machine/cpufunc.h>
+#else
+#include <sys/io.h>
+#endif
+
+#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_FAILED    0x80
+
+/*
+ * Generate interrupt when the virtqueue ring is
+ * completely used, even if we've suppressed them.
+ */
+#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
+
+/*
+ * The guest should never negotiate this feature; it
+ * is used to detect faulty drivers.
+ */
+#define VIRTIO_F_BAD_FEATURE (1 << 30)
+
+/*
+ * 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
+
+/*
+ * 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       0x00001 /* Host handles pkts w/ partial csum */
+#define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/
+#define VIRTIO_NET_F_MAC        0x00020 /* Host has given MAC address. */
+#define VIRTIO_NET_F_GSO        0x00040 /* Host handles pkts w/ any GSO type */
+#define VIRTIO_NET_F_GUEST_TSO4 0x00080 /* Guest can handle TSOv4 in. */
+#define VIRTIO_NET_F_GUEST_TSO6 0x00100 /* Guest can handle TSOv6 in. */
+#define VIRTIO_NET_F_GUEST_ECN  0x00200 /* Guest can handle TSO[6] w/ ECN in.*/
+#define VIRTIO_NET_F_GUEST_UFO  0x00400 /* Guest can handle UFO in. */
+#define VIRTIO_NET_F_HOST_TSO4  0x00800 /* Host can handle TSOv4 in. */
+#define VIRTIO_NET_F_HOST_TSO6  0x01000 /* Host can handle TSOv6 in. */
+#define VIRTIO_NET_F_HOST_ECN   0x02000 /* Host can handle TSO[6] w/ ECN in. */
+#define VIRTIO_NET_F_HOST_UFO   0x04000 /* Host can handle UFO in. */
+#define VIRTIO_NET_F_MRG_RXBUF  0x08000 /* Host can merge receive buffers. */
+#define VIRTIO_NET_F_STATUS     0x10000 /* virtio_net_config.status available*/
+#define VIRTIO_NET_F_CTRL_VQ    0x20000 /* Control channel available */
+#define VIRTIO_NET_F_CTRL_RX    0x40000 /* Control channel RX mode support */
+#define VIRTIO_NET_F_CTRL_VLAN  0x80000 /* Control channel VLAN filtering */
+#define VIRTIO_NET_F_CTRL_RX_EXTRA  0x100000 /* Extra RX mode control support */
+#define VIRTIO_RING_F_INDIRECT_DESC 0x10000000 /* Support for indirect buffer descriptors. */
+/* 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 0x20000000
+
+#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
+
+/*
+ * Maximum number of virtqueues per device.
+ */
+#define VIRTIO_MAX_VIRTQUEUES 8
+
+struct virtio_hw {
+	struct virtqueue *cvq;
+	uint32_t    io_base;
+	uint32_t    guest_features;
+	uint32_t    max_tx_queues;
+	uint32_t    max_rx_queues;
+	uint16_t    vtnet_hdr_size;
+	uint8_t	    use_msix;
+	uint8_t     mac_addr[ETHER_ADDR_LEN];
+};
+
+/*
+ * 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));
+
+/*
+ * The remaining space is defined by each driver as the per-driver
+ * configuration space.
+ */
+#define VIRTIO_PCI_CONFIG(hw) (((hw)->use_msix) ? 24 : 20)
+
+/*
+ * 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
+
+#ifdef __FreeBSD__
+
+static inline void
+outb_p(unsigned char data, unsigned int port)
+{
+
+	outb(port, (u_char)data);
+}
+
+static inline void
+outw_p(unsigned short data, unsigned int port)
+{
+	outw(port, (u_short)data);
+}
+
+static inline void
+outl_p(unsigned int data, unsigned int port)
+{
+	outl(port, (u_int)data);
+}
+#endif
+
+#define VIRTIO_PCI_REG_ADDR(hw, reg) \
+	(unsigned short)((hw)->io_base + (reg))
+
+#define VIRTIO_READ_REG_1(hw, reg) \
+	inb((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_1(hw, reg, value) \
+	outb_p((unsigned char)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+#define VIRTIO_READ_REG_2(hw, reg) \
+	inw((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_2(hw, reg, value) \
+	outw_p((unsigned short)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+#define VIRTIO_READ_REG_4(hw, reg) \
+	inl((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_4(hw, reg, value) \
+	outl_p((unsigned int)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+static inline int
+vtpci_with_feature(struct virtio_hw *hw, uint32_t feature)
+{
+	return (hw->guest_features & feature) != 0;
+}
+
+/*
+ * Function declaration from virtio_pci.c
+ */
+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);
+
+uint32_t vtpci_negotiate_features(struct virtio_hw *, uint32_t);
+
+void vtpci_write_dev_config(struct virtio_hw *, uint64_t, void *, int);
+
+void vtpci_read_dev_config(struct virtio_hw *, uint64_t, void *, int);
+
+#endif /* _VIRTIO_PCI_H_ */
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h b/src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h
new file mode 100755
index 00000000..a16c4991
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_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 int
+vring_size(unsigned int num, unsigned long align)
+{
+	int 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/src/dpdk_lib18/librte_pmd_virtio/virtio_rxtx.c b/src/dpdk_lib18/librte_pmd_virtio/virtio_rxtx.c
new file mode 100755
index 00000000..c013f976
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtio_rxtx.c
@@ -0,0 +1,747 @@
+/*-
+ *   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 "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtqueue.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
+
+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;
+}
+
+static void
+virtqueue_dequeue_pkt_tx(struct virtqueue *vq)
+{
+	struct vring_used_elem *uep;
+	uint16_t used_idx, desc_idx;
+
+	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;
+	vq->vq_used_cons_idx++;
+	vq_ring_free_chain(vq, desc_idx);
+}
+
+
+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 int
+virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie)
+{
+	struct vq_desc_extra *dxp;
+	struct vring_desc *start_dp;
+	uint16_t seg_num = cookie->nb_segs;
+	uint16_t needed = 1 + seg_num;
+	uint16_t head_idx, idx;
+	uint16_t head_size = txvq->hw->vtnet_hdr_size;
+
+	if (unlikely(txvq->vq_free_cnt == 0))
+		return -ENOSPC;
+	if (unlikely(txvq->vq_free_cnt < needed))
+		return -EMSGSIZE;
+	head_idx = txvq->vq_desc_head_idx;
+	if (unlikely(head_idx >= txvq->vq_nentries))
+		return -EFAULT;
+
+	idx = head_idx;
+	dxp = &txvq->vq_descx[idx];
+	if (dxp->cookie != NULL)
+		rte_pktmbuf_free(dxp->cookie);
+	dxp->cookie = (void *)cookie;
+	dxp->ndescs = needed;
+
+	start_dp = txvq->vq_ring.desc;
+	start_dp[idx].addr =
+		txvq->virtio_net_hdr_mem + idx * head_size;
+	start_dp[idx].len = (uint32_t)head_size;
+	start_dp[idx].flags = VRING_DESC_F_NEXT;
+
+	for (; ((seg_num > 0) && (cookie != NULL)); seg_num--) {
+		idx = start_dp[idx].next;
+		start_dp[idx].addr  = RTE_MBUF_DATA_DMA_ADDR(cookie);
+		start_dp[idx].len   = cookie->data_len;
+		start_dp[idx].flags = VRING_DESC_F_NEXT;
+		cookie = cookie->next;
+	}
+
+	start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
+	idx = start_dp[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);
+
+	return 0;
+}
+
+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, vq->vq_alignment);
+	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);
+
+	/* Chain all the descriptors in the ring with an END */
+	for (i = 0; i < size - 1; i++)
+		vr->desc[i].next = (uint16_t)(i + 1);
+	vr->desc[i].next = VQ_RING_DESC_CHAIN_END;
+
+	/*
+	 * 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;
+		while (!virtqueue_full(vq)) {
+			m = rte_rxmbuf_alloc(vq->mpool);
+			if (m == NULL)
+				break;
+
+			/******************************************
+			*         Enqueue allocated buffers        *
+			*******************************************/
+			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);
+
+		VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
+			vq->vq_queue_index);
+		VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
+			vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+	} else if (queue_type == VTNET_TQ) {
+		VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
+			vq->vq_queue_index);
+		VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
+			vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+	} else {
+		VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
+			vq->vq_queue_index);
+		VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
+			vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+	}
+}
+
+void
+virtio_dev_cq_start(struct rte_eth_dev *dev)
+{
+	struct virtio_hw *hw
+		= VIRTIO_DEV_PRIVATE_TO_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)
+{
+	uint8_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, "tvq initialization failed");
+		return ret;
+	}
+
+	/* Create mempool for rx mbuf allocation */
+	vq->mpool = mp;
+
+	dev->data->rx_queues[queue_idx] = vq;
+	return 0;
+}
+
+/*
+ * 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;
+	struct virtqueue *vq;
+	int ret;
+
+	PMD_INIT_FUNC_TRACE();
+
+	if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOOFFLOADS)
+	    != ETH_TXQ_FLAGS_NOOFFLOADS) {
+		PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
+		return -EINVAL;
+	}
+
+	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;
+	}
+
+	dev->data->tx_queues[queue_idx] = vq;
+	return 0;
+}
+
+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);
+	}
+}
+
+#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 rte_mbuf *rxm, *new_mbuf;
+	uint16_t nb_used, num, nb_rx = 0;
+	uint32_t len[VIRTIO_MBUF_BURST_SZ];
+	struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+	int error;
+	uint32_t i, nb_enqueued = 0;
+	const uint32_t hdr_size = sizeof(struct virtio_net_hdr);
+
+	nb_used = VIRTQUEUE_NUSED(rxvq);
+
+	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);
+
+	if (num == 0)
+		return 0;
+
+	num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
+	PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
+	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->nb_segs = 1;
+		rxm->next = NULL;
+		rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
+		rxm->data_len = (uint16_t)(len[i] - hdr_size);
+
+		VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
+
+		rx_pkts[nb_rx++] = rxm;
+		rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
+	}
+
+	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)) {
+		if (unlikely(virtqueue_kick_prepare(rxvq))) {
+			virtqueue_notify(rxvq);
+			PMD_RX_LOG(DEBUG, "Notified\n");
+		}
+	}
+
+	vq_update_avail_idx(rxvq);
+
+	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 rte_mbuf *rxm, *new_mbuf;
+	uint16_t nb_used, num, nb_rx = 0;
+	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 = 0, nb_enqueued = 0;
+	uint32_t seg_num = 0;
+	uint16_t extra_idx = 0;
+	uint32_t seg_res = 0;
+	const uint32_t hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+
+	nb_used = VIRTQUEUE_NUSED(rxvq);
+
+	rmb();
+
+	if (nb_used == 0)
+		return 0;
+
+	PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
+
+	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->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.
+			 */
+			uint32_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;
+		}
+
+		VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
+			rx_pkts[nb_rx]->data_len);
+
+		rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
+		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)) {
+		if (unlikely(virtqueue_kick_prepare(rxvq))) {
+			virtqueue_notify(rxvq);
+			PMD_RX_LOG(DEBUG, "Notified");
+		}
+	}
+
+	vq_update_avail_idx(rxvq);
+
+	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 rte_mbuf *txm;
+	uint16_t nb_used, nb_tx, num;
+	int error;
+
+	nb_tx = 0;
+
+	if (unlikely(nb_pkts < 1))
+		return nb_pkts;
+
+	PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
+	nb_used = VIRTQUEUE_NUSED(txvq);
+
+	rmb();
+
+	num = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);
+
+	while (nb_tx < nb_pkts) {
+		/* Need one more descriptor for virtio header. */
+		int need = tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
+		int deq_cnt = RTE_MIN(need, (int)num);
+
+		num -= (deq_cnt > 0) ? deq_cnt : 0;
+		while (deq_cnt > 0) {
+			virtqueue_dequeue_pkt_tx(txvq);
+			deq_cnt--;
+		}
+
+		need = (int)tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
+		/*
+		 * Zero or negative value indicates it has enough free
+		 * descriptors to use for transmitting.
+		 */
+		if (likely(need <= 0)) {
+			txm = tx_pkts[nb_tx];
+			/* Enqueue Packet buffers */
+			error = virtqueue_enqueue_xmit(txvq, txm);
+			if (unlikely(error)) {
+				if (error == ENOSPC)
+					PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0");
+				else if (error == EMSGSIZE)
+					PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1");
+				else
+					PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d", error);
+				break;
+			}
+			nb_tx++;
+			txvq->bytes += txm->pkt_len;
+		} else {
+			PMD_TX_LOG(ERR, "No free tx descriptors to transmit");
+			break;
+		}
+	}
+	vq_update_avail_idx(txvq);
+
+	txvq->packets += nb_tx;
+
+	if (unlikely(virtqueue_kick_prepare(txvq))) {
+		virtqueue_notify(txvq);
+		PMD_TX_LOG(DEBUG, "Notified backend after xmit");
+	}
+
+	return nb_tx;
+}
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtqueue.c b/src/dpdk_lib18/librte_pmd_virtio/virtqueue.c
new file mode 100755
index 00000000..8a3005fb
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtqueue.c
@@ -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.
+ */
+#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;
+
+	for (idx = 0; idx < vq->vq_nentries; idx++) {
+		if ((cookie = vq->vq_descx[idx].cookie) != NULL) {
+			vq->vq_descx[idx].cookie = NULL;
+			return cookie;
+		}
+	}
+	return NULL;
+}
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtqueue.h b/src/dpdk_lib18/librte_pmd_virtio/virtqueue.h
new file mode 100755
index 00000000..fdee0547
--- /dev/null
+++ b/src/dpdk_lib18/librte_pmd_virtio/virtqueue.h
@@ -0,0 +1,283 @@
+/*-
+ *   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_mbuf.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"
+
+#define mb()  rte_mb()
+#define wmb() rte_wmb()
+#define rmb() rte_rmb()
+
+#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 RTE_MBUF_DATA_DMA_ADDR(mb) \
+	(uint64_t) ((mb)->buf_physaddr + (mb)->data_off)
+
+#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 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 128
+
+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. */
+
+	void        *vq_ring_virt_mem;    /**< linear address of vring*/
+	int         vq_alignment;
+	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_queue_index;       /**< PCI queue index */
+	/**
+	 * 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;
+	phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */
+
+	/* Statistics */
+	uint64_t	packets;
+	uint64_t	bytes;
+	uint64_t	errors;
+
+	struct vq_desc_extra {
+		void              *cookie;
+		uint16_t          ndescs;
+	} vq_descx[0];
+};
+
+/* If multiqueue is provided by host, then we suppport it. */
+#ifndef VIRTIO_NET_F_MQ
+/* Device supports Receive Flow Steering */
+#define VIRTIO_NET_F_MQ 0x400000
+#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
+#endif
+
+/**
+ * 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 */
+};
+
+/**
+ * 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)
+{
+	rte_compiler_barrier();
+	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. mb() necessary?
+	 * For virtio on IA, the notificaiton is through io port operation
+	 * which is a serialization instruction itself.
+	 */
+	VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_NOTIFY, vq->vq_queue_index);
+}
+
+#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_ */