[dpdk-dev,v4,2/5] lib/librte_vhost: re-factor vhost lib for subsequent transform
diff mbox

Message ID 1410519304-14521-3-git-send-email-huawei.xie@intel.com
State Superseded, archived
Headers show

Commit Message

Huawei Xie Sept. 12, 2014, 10:55 a.m. UTC
This patch does simple split of the original vhost example source files.
vhost rx/tx functions virtio_dev_rx/tx are copied from main.c to new file
vhost_rxtx.c.
main.c and main.h are removed. A new vhost example patchset will be submitted
later based on these two files.
Makefile for old example is removed.
virtio-net.h is renamed to rte_virtio_net.h as API header file.


Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Tommy Long <thomas.long@intel.com>
---
 lib/librte_vhost/Makefile         |   60 -
 lib/librte_vhost/main.c           | 3722 -------------------------------------
 lib/librte_vhost/main.h           |   86 -
 lib/librte_vhost/rte_virtio_net.h |  161 ++
 lib/librte_vhost/vhost_rxtx.c     |  281 +++
 lib/librte_vhost/virtio-net.h     |  161 --
 6 files changed, 442 insertions(+), 4029 deletions(-)
 delete mode 100644 lib/librte_vhost/Makefile
 delete mode 100644 lib/librte_vhost/main.c
 delete mode 100644 lib/librte_vhost/main.h
 create mode 100644 lib/librte_vhost/rte_virtio_net.h
 create mode 100644 lib/librte_vhost/vhost_rxtx.c
 delete mode 100644 lib/librte_vhost/virtio-net.h

Patch
diff mbox

diff --git a/lib/librte_vhost/Makefile b/lib/librte_vhost/Makefile
deleted file mode 100644
index f45f83f..0000000
--- a/lib/librte_vhost/Makefile
+++ /dev/null
@@ -1,60 +0,0 @@ 
-#   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.
-
-ifeq ($(RTE_SDK),)
-$(error "Please define RTE_SDK environment variable")
-endif
-
-# Default target, can be overriden by command line or environment
-RTE_TARGET ?= x86_64-native-linuxapp-gcc
-
-include $(RTE_SDK)/mk/rte.vars.mk
-
-ifneq ($(CONFIG_RTE_EXEC_ENV),"linuxapp")
-$(info This application can only operate in a linuxapp environment, \
-please change the definition of the RTE_TARGET environment variable)
-all:
-else
-
-# binary name
-APP = vhost-switch
-
-# all source are stored in SRCS-y
-#SRCS-y := cusedrv.c loopback-userspace.c
-SRCS-y := main.c virtio-net.c vhost-net-cdev.c
-
-CFLAGS += -O2 -I/usr/local/include -D_FILE_OFFSET_BITS=64 -Wno-unused-parameter
-CFLAGS += $(WERROR_FLAGS)
-LDFLAGS += -lfuse
-
-include $(RTE_SDK)/mk/rte.extapp.mk
-
-endif
diff --git a/lib/librte_vhost/main.c b/lib/librte_vhost/main.c
deleted file mode 100644
index 7d9e6a2..0000000
--- a/lib/librte_vhost/main.c
+++ /dev/null
@@ -1,3722 +0,0 @@ 
-/*-
- *   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 <arpa/inet.h>
-#include <getopt.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/virtio_net.h>
-#include <linux/virtio_ring.h>
-#include <signal.h>
-#include <stdint.h>
-#include <sys/eventfd.h>
-#include <sys/param.h>
-#include <unistd.h>
-
-#include <rte_atomic.h>
-#include <rte_cycles.h>
-#include <rte_ethdev.h>
-#include <rte_log.h>
-#include <rte_string_fns.h>
-#include <rte_malloc.h>
-
-#include "main.h"
-#include "virtio-net.h"
-#include "vhost-net-cdev.h"
-
-#define MAX_QUEUES 128
-
-/* the maximum number of external ports supported */
-#define MAX_SUP_PORTS 1
-
-/*
- * Calculate the number of buffers needed per port
- */
-#define NUM_MBUFS_PER_PORT ((MAX_QUEUES*RTE_TEST_RX_DESC_DEFAULT) +  		\
-							(num_switching_cores*MAX_PKT_BURST) +  			\
-							(num_switching_cores*RTE_TEST_TX_DESC_DEFAULT) +\
-							(num_switching_cores*MBUF_CACHE_SIZE))
-
-#define MBUF_CACHE_SIZE 128
-#define MBUF_SIZE (2048 + sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM)
-
-/*
- * No frame data buffer allocated from host are required for zero copy
- * implementation, guest will allocate the frame data buffer, and vhost
- * directly use it.
- */
-#define VIRTIO_DESCRIPTOR_LEN_ZCP 1518
-#define MBUF_SIZE_ZCP (VIRTIO_DESCRIPTOR_LEN_ZCP + sizeof(struct rte_mbuf) \
-	+ RTE_PKTMBUF_HEADROOM)
-#define MBUF_CACHE_SIZE_ZCP 0
-
-/*
- * RX and TX Prefetch, Host, and Write-back threshold values should be
- * carefully set for optimal performance. Consult the network
- * controller's datasheet and supporting DPDK documentation for guidance
- * on how these parameters should be set.
- */
-#define RX_PTHRESH 8 /* Default values of RX prefetch threshold reg. */
-#define RX_HTHRESH 8 /* Default values of RX host threshold reg. */
-#define RX_WTHRESH 4 /* Default values of RX write-back threshold reg. */
-
-/*
- * These default values are optimized for use with the Intel(R) 82599 10 GbE
- * Controller and the DPDK ixgbe PMD. Consider using other values for other
- * network controllers and/or network drivers.
- */
-#define TX_PTHRESH 36 /* Default values of TX prefetch threshold reg. */
-#define TX_HTHRESH 0  /* Default values of TX host threshold reg. */
-#define TX_WTHRESH 0  /* Default values of TX write-back threshold reg. */
-
-#define MAX_PKT_BURST 32 		/* Max burst size for RX/TX */
-#define MAX_MRG_PKT_BURST 16 	/* Max burst for merge buffers. Set to 1 due to performance issue. */
-#define BURST_TX_DRAIN_US 100 	/* TX drain every ~100us */
-
-#define BURST_RX_WAIT_US 15 	/* Defines how long we wait between retries on RX */
-#define BURST_RX_RETRIES 4		/* Number of retries on RX. */
-
-#define JUMBO_FRAME_MAX_SIZE    0x2600
-
-/* State of virtio device. */
-#define DEVICE_MAC_LEARNING 0
-#define DEVICE_RX			1
-#define DEVICE_SAFE_REMOVE	2
-
-/* Config_core_flag status definitions. */
-#define REQUEST_DEV_REMOVAL 1
-#define ACK_DEV_REMOVAL 0
-
-/* Configurable number of RX/TX ring descriptors */
-#define RTE_TEST_RX_DESC_DEFAULT 1024
-#define RTE_TEST_TX_DESC_DEFAULT 512
-
-/*
- * Need refine these 2 macros for legacy and DPDK based front end:
- * Max vring avail descriptor/entries from guest - MAX_PKT_BURST
- * And then adjust power 2.
- */
-/*
- * For legacy front end, 128 descriptors,
- * half for virtio header, another half for mbuf.
- */
-#define RTE_TEST_RX_DESC_DEFAULT_ZCP 32   /* legacy: 32, DPDK virt FE: 128. */
-#define RTE_TEST_TX_DESC_DEFAULT_ZCP 64   /* legacy: 64, DPDK virt FE: 64.  */
-
-/* Get first 4 bytes in mbuf headroom. */
-#define MBUF_HEADROOM_UINT32(mbuf) (*(uint32_t *)((uint8_t *)(mbuf) \
-		+ sizeof(struct rte_mbuf)))
-
-/* true if x is a power of 2 */
-#define POWEROF2(x) ((((x)-1) & (x)) == 0)
-
-#define INVALID_PORT_ID 0xFF
-
-/* Max number of devices. Limited by vmdq. */
-#define MAX_DEVICES 64
-
-/* Size of buffers used for snprintfs. */
-#define MAX_PRINT_BUFF 6072
-
-/* Maximum character device basename size. */
-#define MAX_BASENAME_SZ 10
-
-/* Maximum long option length for option parsing. */
-#define MAX_LONG_OPT_SZ 64
-
-/* Used to compare MAC addresses. */
-#define MAC_ADDR_CMP 0xFFFFFFFFFFFFULL
-
-/* Number of descriptors per cacheline. */
-#define DESC_PER_CACHELINE (CACHE_LINE_SIZE / sizeof(struct vring_desc))
-
-/* mask of enabled ports */
-static uint32_t enabled_port_mask = 0;
-
-/*Number of switching cores enabled*/
-static uint32_t num_switching_cores = 0;
-
-/* number of devices/queues to support*/
-static uint32_t num_queues = 0;
-uint32_t num_devices = 0;
-
-/*
- * Enable zero copy, pkts buffer will directly dma to hw descriptor,
- * disabled on default.
- */
-static uint32_t zero_copy;
-
-/* number of descriptors to apply*/
-static uint32_t num_rx_descriptor = RTE_TEST_RX_DESC_DEFAULT_ZCP;
-static uint32_t num_tx_descriptor = RTE_TEST_TX_DESC_DEFAULT_ZCP;
-
-/* max ring descriptor, ixgbe, i40e, e1000 all are 4096. */
-#define MAX_RING_DESC 4096
-
-struct vpool {
-	struct rte_mempool *pool;
-	struct rte_ring *ring;
-	uint32_t buf_size;
-} vpool_array[MAX_QUEUES+MAX_QUEUES];
-
-/* Enable VM2VM communications. If this is disabled then the MAC address compare is skipped. */
-typedef enum {
-	VM2VM_DISABLED = 0,
-	VM2VM_SOFTWARE = 1,
-	VM2VM_HARDWARE = 2,
-	VM2VM_LAST
-} vm2vm_type;
-static vm2vm_type vm2vm_mode = VM2VM_SOFTWARE;
-
-/* The type of host physical address translated from guest physical address. */
-typedef enum {
-	PHYS_ADDR_CONTINUOUS = 0,
-	PHYS_ADDR_CROSS_SUBREG = 1,
-	PHYS_ADDR_INVALID = 2,
-	PHYS_ADDR_LAST
-} hpa_type;
-
-/* Enable stats. */
-static uint32_t enable_stats = 0;
-/* Enable retries on RX. */
-static uint32_t enable_retry = 1;
-/* Specify timeout (in useconds) between retries on RX. */
-static uint32_t burst_rx_delay_time = BURST_RX_WAIT_US;
-/* Specify the number of retries on RX. */
-static uint32_t burst_rx_retry_num = BURST_RX_RETRIES;
-
-/* Character device basename. Can be set by user. */
-static char dev_basename[MAX_BASENAME_SZ] = "vhost-net";
-
-/* Charater device index. Can be set by user. */
-static uint32_t dev_index = 0;
-
-/* This can be set by the user so it is made available here. */
-extern uint64_t VHOST_FEATURES;
-
-/* Default configuration for rx and tx thresholds etc. */
-static struct rte_eth_rxconf rx_conf_default = {
-	.rx_thresh = {
-		.pthresh = RX_PTHRESH,
-		.hthresh = RX_HTHRESH,
-		.wthresh = RX_WTHRESH,
-	},
-	.rx_drop_en = 1,
-};
-
-/*
- * These default values are optimized for use with the Intel(R) 82599 10 GbE
- * Controller and the DPDK ixgbe/igb PMD. Consider using other values for other
- * network controllers and/or network drivers.
- */
-static struct rte_eth_txconf tx_conf_default = {
-	.tx_thresh = {
-		.pthresh = TX_PTHRESH,
-		.hthresh = TX_HTHRESH,
-		.wthresh = TX_WTHRESH,
-	},
-	.tx_free_thresh = 0, /* Use PMD default values */
-	.tx_rs_thresh = 0, /* Use PMD default values */
-};
-
-/* empty vmdq configuration structure. Filled in programatically */
-static struct rte_eth_conf vmdq_conf_default = {
-	.rxmode = {
-		.mq_mode        = ETH_MQ_RX_VMDQ_ONLY,
-		.split_hdr_size = 0,
-		.header_split   = 0, /**< Header Split disabled */
-		.hw_ip_checksum = 0, /**< IP checksum offload disabled */
-		.hw_vlan_filter = 0, /**< VLAN filtering disabled */
-		/*
-		 * It is necessary for 1G NIC such as I350,
-		 * this fixes bug of ipv4 forwarding in guest can't
-		 * forward pakets from one virtio dev to another virtio dev.
-		 */
-		.hw_vlan_strip  = 1, /**< VLAN strip enabled. */
-		.jumbo_frame    = 0, /**< Jumbo Frame Support disabled */
-		.hw_strip_crc   = 0, /**< CRC stripped by hardware */
-	},
-
-	.txmode = {
-		.mq_mode = ETH_MQ_TX_NONE,
-	},
-	.rx_adv_conf = {
-		/*
-		 * should be overridden separately in code with
-		 * appropriate values
-		 */
-		.vmdq_rx_conf = {
-			.nb_queue_pools = ETH_8_POOLS,
-			.enable_default_pool = 0,
-			.default_pool = 0,
-			.nb_pool_maps = 0,
-			.pool_map = {{0, 0},},
-		},
-	},
-};
-
-static unsigned lcore_ids[RTE_MAX_LCORE];
-static uint8_t ports[RTE_MAX_ETHPORTS];
-static unsigned num_ports = 0; /**< The number of ports specified in command line */
-
-static const uint16_t external_pkt_default_vlan_tag = 2000;
-const uint16_t vlan_tags[] = {
-	1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
-	1008, 1009, 1010, 1011,	1012, 1013, 1014, 1015,
-	1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023,
-	1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031,
-	1032, 1033, 1034, 1035, 1036, 1037, 1038, 1039,
-	1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047,
-	1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055,
-	1056, 1057, 1058, 1059, 1060, 1061, 1062, 1063,
-};
-
-/* ethernet addresses of ports */
-static struct ether_addr vmdq_ports_eth_addr[RTE_MAX_ETHPORTS];
-
-/* heads for the main used and free linked lists for the data path. */
-static struct virtio_net_data_ll *ll_root_used = NULL;
-static struct virtio_net_data_ll *ll_root_free = NULL;
-
-/* Array of data core structures containing information on individual core linked lists. */
-static struct lcore_info lcore_info[RTE_MAX_LCORE];
-
-/* Used for queueing bursts of TX packets. */
-struct mbuf_table {
-	unsigned len;
-	unsigned txq_id;
-	struct rte_mbuf *m_table[MAX_PKT_BURST];
-};
-
-/* TX queue for each data core. */
-struct mbuf_table lcore_tx_queue[RTE_MAX_LCORE];
-
-/* TX queue fori each virtio device for zero copy. */
-struct mbuf_table tx_queue_zcp[MAX_QUEUES];
-
-/* Vlan header struct used to insert vlan tags on TX. */
-struct vlan_ethhdr {
-	unsigned char   h_dest[ETH_ALEN];
-	unsigned char   h_source[ETH_ALEN];
-	__be16          h_vlan_proto;
-	__be16          h_vlan_TCI;
-	__be16          h_vlan_encapsulated_proto;
-};
-
-/* IPv4 Header */
-struct ipv4_hdr {
-	uint8_t  version_ihl;		/**< version and header length */
-	uint8_t  type_of_service;	/**< type of service */
-	uint16_t total_length;		/**< length of packet */
-	uint16_t packet_id;		/**< packet ID */
-	uint16_t fragment_offset;	/**< fragmentation offset */
-	uint8_t  time_to_live;		/**< time to live */
-	uint8_t  next_proto_id;		/**< protocol ID */
-	uint16_t hdr_checksum;		/**< header checksum */
-	uint32_t src_addr;		/**< source address */
-	uint32_t dst_addr;		/**< destination address */
-} __attribute__((__packed__));
-
-/* Header lengths. */
-#define VLAN_HLEN       4
-#define VLAN_ETH_HLEN   18
-
-/* Per-device statistics struct */
-struct device_statistics {
-	uint64_t tx_total;
-	rte_atomic64_t rx_total_atomic;
-	uint64_t rx_total;
-	uint64_t tx;
-	rte_atomic64_t rx_atomic;
-	uint64_t rx;
-} __rte_cache_aligned;
-struct device_statistics dev_statistics[MAX_DEVICES];
-
-/*
- * Builds up the correct configuration for VMDQ VLAN pool map
- * according to the pool & queue limits.
- */
-static inline int
-get_eth_conf(struct rte_eth_conf *eth_conf, uint32_t num_devices)
-{
-	struct rte_eth_vmdq_rx_conf conf;
-	unsigned i;
-
-	memset(&conf, 0, sizeof(conf));
-	conf.nb_queue_pools = (enum rte_eth_nb_pools)num_devices;
-	conf.nb_pool_maps = num_devices;
-	conf.enable_loop_back =
-		vmdq_conf_default.rx_adv_conf.vmdq_rx_conf.enable_loop_back;
-
-	for (i = 0; i < conf.nb_pool_maps; i++) {
-		conf.pool_map[i].vlan_id = vlan_tags[ i ];
-		conf.pool_map[i].pools = (1UL << i);
-	}
-
-	(void)(rte_memcpy(eth_conf, &vmdq_conf_default, sizeof(*eth_conf)));
-	(void)(rte_memcpy(&eth_conf->rx_adv_conf.vmdq_rx_conf, &conf,
-		   sizeof(eth_conf->rx_adv_conf.vmdq_rx_conf)));
-	return 0;
-}
-
-/*
- * Validate the device number according to the max pool number gotten form
- * dev_info. If the device number is invalid, give the error message and
- * return -1. Each device must have its own pool.
- */
-static inline int
-validate_num_devices(uint32_t max_nb_devices)
-{
-	if (num_devices > max_nb_devices) {
-		RTE_LOG(ERR, VHOST_PORT, "invalid number of devices\n");
-		return -1;
-	}
-	return 0;
-}
-
-/*
- * Initialises a given port using global settings and with the rx buffers
- * coming from the mbuf_pool passed as parameter
- */
-static inline int
-port_init(uint8_t port)
-{
-	struct rte_eth_dev_info dev_info;
-	struct rte_eth_conf port_conf;
-	uint16_t rx_rings, tx_rings;
-	uint16_t rx_ring_size, tx_ring_size;
-	int retval;
-	uint16_t q;
-
-	/* The max pool number from dev_info will be used to validate the pool number specified in cmd line */
-	rte_eth_dev_info_get (port, &dev_info);
-
-	/*configure the number of supported virtio devices based on VMDQ limits */
-	num_devices = dev_info.max_vmdq_pools;
-	num_queues = dev_info.max_rx_queues;
-
-	if (zero_copy) {
-		rx_ring_size = num_rx_descriptor;
-		tx_ring_size = num_tx_descriptor;
-		tx_rings = dev_info.max_tx_queues;
-	} else {
-		rx_ring_size = RTE_TEST_RX_DESC_DEFAULT;
-		tx_ring_size = RTE_TEST_TX_DESC_DEFAULT;
-		tx_rings = (uint16_t)rte_lcore_count();
-	}
-
-	retval = validate_num_devices(MAX_DEVICES);
-	if (retval < 0)
-		return retval;
-
-	/* Get port configuration. */
-	retval = get_eth_conf(&port_conf, num_devices);
-	if (retval < 0)
-		return retval;
-
-	if (port >= rte_eth_dev_count()) return -1;
-
-	rx_rings = (uint16_t)num_queues,
-	/* Configure ethernet device. */
-	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
-	if (retval != 0)
-		return retval;
-
-	/* Setup the queues. */
-	for (q = 0; q < rx_rings; q ++) {
-		retval = rte_eth_rx_queue_setup(port, q, rx_ring_size,
-						rte_eth_dev_socket_id(port), &rx_conf_default,
-						vpool_array[q].pool);
-		if (retval < 0)
-			return retval;
-	}
-	for (q = 0; q < tx_rings; q ++) {
-		retval = rte_eth_tx_queue_setup(port, q, tx_ring_size,
-						rte_eth_dev_socket_id(port), &tx_conf_default);
-		if (retval < 0)
-			return retval;
-	}
-
-	/* Start the device. */
-	retval  = rte_eth_dev_start(port);
-	if (retval < 0) {
-		RTE_LOG(ERR, VHOST_DATA, "Failed to start the device.\n");
-		return retval;
-	}
-
-	rte_eth_macaddr_get(port, &vmdq_ports_eth_addr[port]);
-	RTE_LOG(INFO, VHOST_PORT, "Max virtio devices supported: %u\n", num_devices);
-	RTE_LOG(INFO, VHOST_PORT, "Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
-			" %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
-			(unsigned)port,
-			vmdq_ports_eth_addr[port].addr_bytes[0],
-			vmdq_ports_eth_addr[port].addr_bytes[1],
-			vmdq_ports_eth_addr[port].addr_bytes[2],
-			vmdq_ports_eth_addr[port].addr_bytes[3],
-			vmdq_ports_eth_addr[port].addr_bytes[4],
-			vmdq_ports_eth_addr[port].addr_bytes[5]);
-
-	return 0;
-}
-
-/*
- * Set character device basename.
- */
-static int
-us_vhost_parse_basename(const char *q_arg)
-{
-	/* parse number string */
-
-	if (strnlen(q_arg, MAX_BASENAME_SZ) > MAX_BASENAME_SZ)
-		return -1;
-	else
-		snprintf((char*)&dev_basename, MAX_BASENAME_SZ, "%s", q_arg);
-
-	return 0;
-}
-
-/*
- * Parse the portmask provided at run time.
- */
-static int
-parse_portmask(const char *portmask)
-{
-	char *end = NULL;
-	unsigned long pm;
-
-	errno = 0;
-
-	/* parse hexadecimal string */
-	pm = strtoul(portmask, &end, 16);
-	if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0))
-		return -1;
-
-	if (pm == 0)
-		return -1;
-
-	return pm;
-
-}
-
-/*
- * Parse num options at run time.
- */
-static int
-parse_num_opt(const char *q_arg, uint32_t max_valid_value)
-{
-	char *end = NULL;
-	unsigned long num;
-
-	errno = 0;
-
-	/* parse unsigned int string */
-	num = strtoul(q_arg, &end, 10);
-	if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0))
-		return -1;
-
-	if (num > max_valid_value)
-		return -1;
-
-	return num;
-
-}
-
-/*
- * Display usage
- */
-static void
-us_vhost_usage(const char *prgname)
-{
-	RTE_LOG(INFO, VHOST_CONFIG, "%s [EAL options] -- -p PORTMASK\n"
-	"		--vm2vm [0|1|2]\n"
-	"		--rx_retry [0|1] --mergeable [0|1] --stats [0-N]\n"
-	"		--dev-basename <name> --dev-index [0-N]\n"
-	"		--nb-devices ND\n"
-	"		-p PORTMASK: Set mask for ports to be used by application\n"
-	"		--vm2vm [0|1|2]: disable/software(default)/hardware vm2vm comms\n"
-	"		--rx-retry [0|1]: disable/enable(default) retries on rx. Enable retry if destintation queue is full\n"
-	"		--rx-retry-delay [0-N]: timeout(in usecond) between retries on RX. This makes effect only if retries on rx enabled\n"
-	"		--rx-retry-num [0-N]: the number of retries on rx. This makes effect only if retries on rx enabled\n"
-	"		--mergeable [0|1]: disable(default)/enable RX mergeable buffers\n"
-	"		--stats [0-N]: 0: Disable stats, N: Time in seconds to print stats\n"
-	"		--dev-basename: The basename to be used for the character device.\n"
-	"		--dev-index [0-N]: Defaults to zero if not used. Index is appended to basename.\n"
-	"		--zero-copy [0|1]: disable(default)/enable rx/tx "
-			"zero copy\n"
-	"		--rx-desc-num [0-N]: the number of descriptors on rx, "
-			"used only when zero copy is enabled.\n"
-	"		--tx-desc-num [0-N]: the number of descriptors on tx, "
-			"used only when zero copy is enabled.\n",
-	       prgname);
-}
-
-/*
- * Parse the arguments given in the command line of the application.
- */
-static int
-us_vhost_parse_args(int argc, char **argv)
-{
-	int opt, ret;
-	int option_index;
-	unsigned i;
-	const char *prgname = argv[0];
-	static struct option long_option[] = {
-		{"vm2vm", required_argument, NULL, 0},
-		{"rx-retry", required_argument, NULL, 0},
-		{"rx-retry-delay", required_argument, NULL, 0},
-		{"rx-retry-num", required_argument, NULL, 0},
-		{"mergeable", required_argument, NULL, 0},
-		{"stats", required_argument, NULL, 0},
-		{"dev-basename", required_argument, NULL, 0},
-		{"dev-index", required_argument, NULL, 0},
-		{"zero-copy", required_argument, NULL, 0},
-		{"rx-desc-num", required_argument, NULL, 0},
-		{"tx-desc-num", required_argument, NULL, 0},
-		{NULL, 0, 0, 0},
-	};
-
-	/* Parse command line */
-	while ((opt = getopt_long(argc, argv, "p:",long_option, &option_index)) != EOF) {
-		switch (opt) {
-		/* Portmask */
-		case 'p':
-			enabled_port_mask = parse_portmask(optarg);
-			if (enabled_port_mask == 0) {
-				RTE_LOG(INFO, VHOST_CONFIG, "Invalid portmask\n");
-				us_vhost_usage(prgname);
-				return -1;
-			}
-			break;
-
-		case 0:
-			/* Enable/disable vm2vm comms. */
-			if (!strncmp(long_option[option_index].name, "vm2vm",
-				MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, (VM2VM_LAST - 1));
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-						"Invalid argument for "
-						"vm2vm [0|1|2]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					vm2vm_mode = (vm2vm_type)ret;
-				}
-			}
-
-			/* Enable/disable retries on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					enable_retry = ret;
-				}
-			}
-
-			/* Specify the retries delay time (in useconds) on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry-delay", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-delay [0-N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					burst_rx_delay_time = ret;
-				}
-			}
-
-			/* Specify the retries number on RX. */
-			if (!strncmp(long_option[option_index].name, "rx-retry-num", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for rx-retry-num [0-N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					burst_rx_retry_num = ret;
-				}
-			}
-
-			/* Enable/disable RX mergeable buffers. */
-			if (!strncmp(long_option[option_index].name, "mergeable", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for mergeable [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					if (ret) {
-						vmdq_conf_default.rxmode.jumbo_frame = 1;
-						vmdq_conf_default.rxmode.max_rx_pkt_len
-							= JUMBO_FRAME_MAX_SIZE;
-						VHOST_FEATURES = (1ULL << VIRTIO_NET_F_MRG_RXBUF);
-					}
-				}
-			}
-
-			/* Enable/disable stats. */
-			if (!strncmp(long_option[option_index].name, "stats", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for stats [0..N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					enable_stats = ret;
-				}
-			}
-
-			/* Set character device basename. */
-			if (!strncmp(long_option[option_index].name, "dev-basename", MAX_LONG_OPT_SZ)) {
-				if (us_vhost_parse_basename(optarg) == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for character device basename (Max %d characters)\n", MAX_BASENAME_SZ);
-					us_vhost_usage(prgname);
-					return -1;
-				}
-			}
-
-			/* Set character device index. */
-			if (!strncmp(long_option[option_index].name, "dev-index", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, INT32_MAX);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG, "Invalid argument for character device index [0..N]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else
-					dev_index = ret;
-			}
-
-			/* Enable/disable rx/tx zero copy. */
-			if (!strncmp(long_option[option_index].name,
-				"zero-copy", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, 1);
-				if (ret == -1) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-						"Invalid argument"
-						" for zero-copy [0|1]\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else
-					zero_copy = ret;
-
-				if (zero_copy) {
-#ifdef RTE_MBUF_SCATTER_GATHER
-					RTE_LOG(ERR, VHOST_CONFIG, "Before running "
-					"zero copy vhost APP, please "
-					"disable RTE_MBUF_SCATTER_GATHER\n"
-					"in config file and then rebuild DPDK "
-					"core lib!\n"
-					"Otherwise please disable zero copy "
-					"flag in command line!\n");
-					return -1;
-#endif
-				}
-			}
-
-			/* Specify the descriptor number on RX. */
-			if (!strncmp(long_option[option_index].name,
-				"rx-desc-num", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, MAX_RING_DESC);
-				if ((ret == -1) || (!POWEROF2(ret))) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-					"Invalid argument for rx-desc-num[0-N],"
-					"power of 2 required.\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					num_rx_descriptor = ret;
-				}
-			}
-
-			/* Specify the descriptor number on TX. */
-			if (!strncmp(long_option[option_index].name,
-				"tx-desc-num", MAX_LONG_OPT_SZ)) {
-				ret = parse_num_opt(optarg, MAX_RING_DESC);
-				if ((ret == -1) || (!POWEROF2(ret))) {
-					RTE_LOG(INFO, VHOST_CONFIG,
-					"Invalid argument for tx-desc-num [0-N],"
-					"power of 2 required.\n");
-					us_vhost_usage(prgname);
-					return -1;
-				} else {
-					num_tx_descriptor = ret;
-				}
-			}
-
-			break;
-
-			/* Invalid option - print options. */
-		default:
-			us_vhost_usage(prgname);
-			return -1;
-		}
-	}
-
-	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
-		if (enabled_port_mask & (1 << i))
-			ports[num_ports++] = (uint8_t)i;
-	}
-
-	if ((num_ports ==  0) || (num_ports > MAX_SUP_PORTS)) {
-		RTE_LOG(INFO, VHOST_PORT, "Current enabled port number is %u,"
-			"but only %u port can be enabled\n",num_ports, MAX_SUP_PORTS);
-		return -1;
-	}
-
-	if ((zero_copy == 1) && (vm2vm_mode == VM2VM_SOFTWARE)) {
-		RTE_LOG(INFO, VHOST_PORT,
-			"Vhost zero copy doesn't support software vm2vm,"
-			"please specify 'vm2vm 2' to use hardware vm2vm.\n");
-		return -1;
-	}
-
-	if ((zero_copy == 1) && (vmdq_conf_default.rxmode.jumbo_frame == 1)) {
-		RTE_LOG(INFO, VHOST_PORT,
-			"Vhost zero copy doesn't support jumbo frame,"
-			"please specify '--mergeable 0' to disable the "
-			"mergeable feature.\n");
-		return -1;
-	}
-
-	return 0;
-}
-
-/*
- * Update the global var NUM_PORTS and array PORTS according to system ports number
- * and return valid ports number
- */
-static unsigned check_ports_num(unsigned nb_ports)
-{
-	unsigned valid_num_ports = num_ports;
-	unsigned portid;
-
-	if (num_ports > nb_ports) {
-		RTE_LOG(INFO, VHOST_PORT, "\nSpecified port number(%u) exceeds total system port number(%u)\n",
-			num_ports, nb_ports);
-		num_ports = nb_ports;
-	}
-
-	for (portid = 0; portid < num_ports; portid ++) {
-		if (ports[portid] >= nb_ports) {
-			RTE_LOG(INFO, VHOST_PORT, "\nSpecified port ID(%u) exceeds max system port ID(%u)\n",
-				ports[portid], (nb_ports - 1));
-			ports[portid] = INVALID_PORT_ID;
-			valid_num_ports--;
-		}
-	}
-	return valid_num_ports;
-}
-
-/*
- * Macro to print out packet contents. Wrapped in debug define so that the
- * data path is not effected when debug is disabled.
- */
-#ifdef DEBUG
-#define PRINT_PACKET(device, addr, size, header) do {																\
-	char *pkt_addr = (char*)(addr);																					\
-	unsigned int index;																								\
-	char packet[MAX_PRINT_BUFF];																					\
-																													\
-	if ((header))																									\
-		snprintf(packet, MAX_PRINT_BUFF, "(%"PRIu64") Header size %d: ", (device->device_fh), (size));				\
-	else																											\
-		snprintf(packet, MAX_PRINT_BUFF, "(%"PRIu64") Packet size %d: ", (device->device_fh), (size));				\
-	for (index = 0; index < (size); index++) {																		\
-		snprintf(packet + strnlen(packet, MAX_PRINT_BUFF), MAX_PRINT_BUFF - strnlen(packet, MAX_PRINT_BUFF),	\
-			"%02hhx ", pkt_addr[index]);																			\
-	}																												\
-	snprintf(packet + strnlen(packet, MAX_PRINT_BUFF), MAX_PRINT_BUFF - strnlen(packet, MAX_PRINT_BUFF), "\n");	\
-																													\
-	LOG_DEBUG(VHOST_DATA, "%s", packet);																					\
-} while(0)
-#else
-#define PRINT_PACKET(device, addr, size, header) do{} while(0)
-#endif
-
-/*
- * Function to convert guest physical addresses to vhost virtual addresses. This
- * is used to convert virtio buffer addresses.
- */
-static inline uint64_t __attribute__((always_inline))
-gpa_to_vva(struct virtio_net *dev, uint64_t guest_pa)
-{
-	struct virtio_memory_regions *region;
-	uint32_t regionidx;
-	uint64_t vhost_va = 0;
-
-	for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
-		region = &dev->mem->regions[regionidx];
-		if ((guest_pa >= region->guest_phys_address) &&
-			(guest_pa <= region->guest_phys_address_end)) {
-			vhost_va = region->address_offset + guest_pa;
-			break;
-		}
-	}
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") GPA %p| VVA %p\n",
-		dev->device_fh, (void*)(uintptr_t)guest_pa, (void*)(uintptr_t)vhost_va);
-
-	return vhost_va;
-}
-
-/*
- * Function to convert guest physical addresses to vhost physical addresses.
- * This is used to convert virtio buffer addresses.
- */
-static inline uint64_t __attribute__((always_inline))
-gpa_to_hpa(struct virtio_net *dev, uint64_t guest_pa,
-	uint32_t buf_len, hpa_type *addr_type)
-{
-	struct virtio_memory_regions_hpa *region;
-	uint32_t regionidx;
-	uint64_t vhost_pa = 0;
-
-	*addr_type = PHYS_ADDR_INVALID;
-
-	for (regionidx = 0; regionidx < dev->mem->nregions_hpa; regionidx++) {
-		region = &dev->mem->regions_hpa[regionidx];
-		if ((guest_pa >= region->guest_phys_address) &&
-			(guest_pa <= region->guest_phys_address_end)) {
-			vhost_pa = region->host_phys_addr_offset + guest_pa;
-			if (likely((guest_pa + buf_len - 1)
-				<= region->guest_phys_address_end))
-				*addr_type = PHYS_ADDR_CONTINUOUS;
-			else
-				*addr_type = PHYS_ADDR_CROSS_SUBREG;
-			break;
-		}
-	}
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") GPA %p| HPA %p\n",
-		dev->device_fh, (void *)(uintptr_t)guest_pa,
-		(void *)(uintptr_t)vhost_pa);
-
-	return vhost_pa;
-}
-
-/*
- * This function adds buffers to the virtio devices RX virtqueue. Buffers can
- * be received from the physical port or from another virtio device. A packet
- * count is returned to indicate the number of packets that were succesfully
- * added to the RX queue. This function works when mergeable is disabled.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_rx(struct virtio_net *dev, struct rte_mbuf **pkts, uint32_t count)
-{
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	struct rte_mbuf *buff;
-	/* The virtio_hdr is initialised to 0. */
-	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0,0,0,0,0,0},0};
-	uint64_t buff_addr = 0;
-	uint64_t buff_hdr_addr = 0;
-	uint32_t head[MAX_PKT_BURST], packet_len = 0;
-	uint32_t head_idx, packet_success = 0;
-	uint32_t retry = 0;
-	uint16_t avail_idx, res_cur_idx;
-	uint16_t res_base_idx, res_end_idx;
-	uint16_t free_entries;
-	uint8_t success = 0;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
-	vq = dev->virtqueue[VIRTIO_RXQ];
-	count = (count > MAX_PKT_BURST) ? MAX_PKT_BURST : count;
-
-	/* As many data cores may want access to available buffers, they need to be reserved. */
-	do {
-		res_base_idx = vq->last_used_idx_res;
-		avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-
-		free_entries = (avail_idx - res_base_idx);
-		/* If retry is enabled and the queue is full then we wait and retry to avoid packet loss. */
-		if (enable_retry && unlikely(count > free_entries)) {
-			for (retry = 0; retry < burst_rx_retry_num; retry++) {
-				rte_delay_us(burst_rx_delay_time);
-				avail_idx =
-					*((volatile uint16_t *)&vq->avail->idx);
-				free_entries = (avail_idx - res_base_idx);
-				if (count <= free_entries)
-					break;
-			}
-		}
-
-		/*check that we have enough buffers*/
-		if (unlikely(count > free_entries))
-			count = free_entries;
-
-		if (count == 0)
-			return 0;
-
-		res_end_idx = res_base_idx + count;
-		/* vq->last_used_idx_res is atomically updated. */
-		success = rte_atomic16_cmpset(&vq->last_used_idx_res, res_base_idx,
-									res_end_idx);
-	} while (unlikely(success == 0));
-	res_cur_idx = res_base_idx;
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| End Index %d\n", dev->device_fh, res_cur_idx, res_end_idx);
-
-	/* Prefetch available ring to retrieve indexes. */
-	rte_prefetch0(&vq->avail->ring[res_cur_idx & (vq->size - 1)]);
-
-	/* Retrieve all of the head indexes first to avoid caching issues. */
-	for (head_idx = 0; head_idx < count; head_idx++)
-		head[head_idx] = vq->avail->ring[(res_cur_idx + head_idx) & (vq->size - 1)];
-
-	/*Prefetch descriptor index. */
-	rte_prefetch0(&vq->desc[head[packet_success]]);
-
-	while (res_cur_idx != res_end_idx) {
-		/* Get descriptor from available ring */
-		desc = &vq->desc[head[packet_success]];
-
-		buff = pkts[packet_success];
-
-		/* Convert from gpa to vva (guest physical addr -> vhost virtual addr) */
-		buff_addr = gpa_to_vva(dev, desc->addr);
-		/* Prefetch buffer address. */
-		rte_prefetch0((void*)(uintptr_t)buff_addr);
-
-		/* Copy virtio_hdr to packet and increment buffer address */
-		buff_hdr_addr = buff_addr;
-		packet_len = rte_pktmbuf_data_len(buff) + vq->vhost_hlen;
-
-		/*
-		 * If the descriptors are chained the header and data are
-		 * placed in separate buffers.
-		 */
-		if (desc->flags & VRING_DESC_F_NEXT) {
-			desc->len = vq->vhost_hlen;
-			desc = &vq->desc[desc->next];
-			/* Buffer address translation. */
-			buff_addr = gpa_to_vva(dev, desc->addr);
-			desc->len = rte_pktmbuf_data_len(buff);
-		} else {
-			buff_addr += vq->vhost_hlen;
-			desc->len = packet_len;
-		}
-
-		/* Update used ring with desc information */
-		vq->used->ring[res_cur_idx & (vq->size - 1)].id = head[packet_success];
-		vq->used->ring[res_cur_idx & (vq->size - 1)].len = packet_len;
-
-		/* Copy mbuf data to buffer */
-		rte_memcpy((void *)(uintptr_t)buff_addr,
-			(const void *)buff->pkt.data,
-			rte_pktmbuf_data_len(buff));
-		PRINT_PACKET(dev, (uintptr_t)buff_addr,
-			rte_pktmbuf_data_len(buff), 0);
-
-		res_cur_idx++;
-		packet_success++;
-
-		rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
-			(const void *)&virtio_hdr, vq->vhost_hlen);
-
-		PRINT_PACKET(dev, (uintptr_t)buff_hdr_addr, vq->vhost_hlen, 1);
-
-		if (res_cur_idx < res_end_idx) {
-			/* Prefetch descriptor index. */
-			rte_prefetch0(&vq->desc[head[packet_success]]);
-		}
-	}
-
-	rte_compiler_barrier();
-
-	/* Wait until it's our turn to add our buffer to the used ring. */
-	while (unlikely(vq->last_used_idx != res_base_idx))
-		rte_pause();
-
-	*(volatile uint16_t *)&vq->used->idx += count;
-	vq->last_used_idx = res_end_idx;
-
-	/* Kick the guest if necessary. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-	return count;
-}
-
-static inline uint32_t __attribute__((always_inline))
-copy_from_mbuf_to_vring(struct virtio_net *dev,
-	uint16_t res_base_idx, uint16_t res_end_idx,
-	struct rte_mbuf *pkt)
-{
-	uint32_t vec_idx = 0;
-	uint32_t entry_success = 0;
-	struct vhost_virtqueue *vq;
-	/* The virtio_hdr is initialised to 0. */
-	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {
-		{0, 0, 0, 0, 0, 0}, 0};
-	uint16_t cur_idx = res_base_idx;
-	uint64_t vb_addr = 0;
-	uint64_t vb_hdr_addr = 0;
-	uint32_t seg_offset = 0;
-	uint32_t vb_offset = 0;
-	uint32_t seg_avail;
-	uint32_t vb_avail;
-	uint32_t cpy_len, entry_len;
-
-	if (pkt == NULL)
-		return 0;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| "
-		"End Index %d\n",
-		dev->device_fh, cur_idx, res_end_idx);
-
-	/*
-	 * Convert from gpa to vva
-	 * (guest physical addr -> vhost virtual addr)
-	 */
-	vq = dev->virtqueue[VIRTIO_RXQ];
-	vb_addr =
-		gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
-	vb_hdr_addr = vb_addr;
-
-	/* Prefetch buffer address. */
-	rte_prefetch0((void *)(uintptr_t)vb_addr);
-
-	virtio_hdr.num_buffers = res_end_idx - res_base_idx;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") RX: Num merge buffers %d\n",
-		dev->device_fh, virtio_hdr.num_buffers);
-
-	rte_memcpy((void *)(uintptr_t)vb_hdr_addr,
-		(const void *)&virtio_hdr, vq->vhost_hlen);
-
-	PRINT_PACKET(dev, (uintptr_t)vb_hdr_addr, vq->vhost_hlen, 1);
-
-	seg_avail = rte_pktmbuf_data_len(pkt);
-	vb_offset = vq->vhost_hlen;
-	vb_avail =
-		vq->buf_vec[vec_idx].buf_len - vq->vhost_hlen;
-
-	entry_len = vq->vhost_hlen;
-
-	if (vb_avail == 0) {
-		uint32_t desc_idx =
-			vq->buf_vec[vec_idx].desc_idx;
-		vq->desc[desc_idx].len = vq->vhost_hlen;
-
-		if ((vq->desc[desc_idx].flags
-			& VRING_DESC_F_NEXT) == 0) {
-			/* Update used ring with desc information */
-			vq->used->ring[cur_idx & (vq->size - 1)].id
-				= vq->buf_vec[vec_idx].desc_idx;
-			vq->used->ring[cur_idx & (vq->size - 1)].len
-				= entry_len;
-
-			entry_len = 0;
-			cur_idx++;
-			entry_success++;
-		}
-
-		vec_idx++;
-		vb_addr =
-			gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
-
-		/* Prefetch buffer address. */
-		rte_prefetch0((void *)(uintptr_t)vb_addr);
-		vb_offset = 0;
-		vb_avail = vq->buf_vec[vec_idx].buf_len;
-	}
-
-	cpy_len = RTE_MIN(vb_avail, seg_avail);
-
-	while (cpy_len > 0) {
-		/* Copy mbuf data to vring buffer */
-		rte_memcpy((void *)(uintptr_t)(vb_addr + vb_offset),
-			(const void *)(rte_pktmbuf_mtod(pkt, char*) + seg_offset),
-			cpy_len);
-
-		PRINT_PACKET(dev,
-			(uintptr_t)(vb_addr + vb_offset),
-			cpy_len, 0);
-
-		seg_offset += cpy_len;
-		vb_offset += cpy_len;
-		seg_avail -= cpy_len;
-		vb_avail -= cpy_len;
-		entry_len += cpy_len;
-
-		if (seg_avail != 0) {
-			/*
-			 * The virtio buffer in this vring
-			 * entry reach to its end.
-			 * But the segment doesn't complete.
-			 */
-			if ((vq->desc[vq->buf_vec[vec_idx].desc_idx].flags &
-				VRING_DESC_F_NEXT) == 0) {
-				/* Update used ring with desc information */
-				vq->used->ring[cur_idx & (vq->size - 1)].id
-					= vq->buf_vec[vec_idx].desc_idx;
-				vq->used->ring[cur_idx & (vq->size - 1)].len
-					= entry_len;
-				entry_len = 0;
-				cur_idx++;
-				entry_success++;
-			}
-
-			vec_idx++;
-			vb_addr = gpa_to_vva(dev,
-				vq->buf_vec[vec_idx].buf_addr);
-			vb_offset = 0;
-			vb_avail = vq->buf_vec[vec_idx].buf_len;
-			cpy_len = RTE_MIN(vb_avail, seg_avail);
-		} else {
-			/*
-			 * This current segment complete, need continue to
-			 * check if the whole packet complete or not.
-			 */
-			pkt = pkt->pkt.next;
-			if (pkt != NULL) {
-				/*
-				 * There are more segments.
-				 */
-				if (vb_avail == 0) {
-					/*
-					 * This current buffer from vring is
-					 * used up, need fetch next buffer
-					 * from buf_vec.
-					 */
-					uint32_t desc_idx =
-						vq->buf_vec[vec_idx].desc_idx;
-					vq->desc[desc_idx].len = vb_offset;
-
-					if ((vq->desc[desc_idx].flags &
-						VRING_DESC_F_NEXT) == 0) {
-						uint16_t wrapped_idx =
-							cur_idx & (vq->size - 1);
-						/*
-						 * Update used ring with the
-						 * descriptor information
-						 */
-						vq->used->ring[wrapped_idx].id
-							= desc_idx;
-						vq->used->ring[wrapped_idx].len
-							= entry_len;
-						entry_success++;
-						entry_len = 0;
-						cur_idx++;
-					}
-
-					/* Get next buffer from buf_vec. */
-					vec_idx++;
-					vb_addr = gpa_to_vva(dev,
-						vq->buf_vec[vec_idx].buf_addr);
-					vb_avail =
-						vq->buf_vec[vec_idx].buf_len;
-					vb_offset = 0;
-				}
-
-				seg_offset = 0;
-				seg_avail = rte_pktmbuf_data_len(pkt);
-				cpy_len = RTE_MIN(vb_avail, seg_avail);
-			} else {
-				/*
-				 * This whole packet completes.
-				 */
-				uint32_t desc_idx =
-					vq->buf_vec[vec_idx].desc_idx;
-				vq->desc[desc_idx].len = vb_offset;
-
-				while (vq->desc[desc_idx].flags &
-					VRING_DESC_F_NEXT) {
-					desc_idx = vq->desc[desc_idx].next;
-					 vq->desc[desc_idx].len = 0;
-				}
-
-				/* Update used ring with desc information */
-				vq->used->ring[cur_idx & (vq->size - 1)].id
-					= vq->buf_vec[vec_idx].desc_idx;
-				vq->used->ring[cur_idx & (vq->size - 1)].len
-					= entry_len;
-				entry_len = 0;
-				cur_idx++;
-				entry_success++;
-				seg_avail = 0;
-				cpy_len = RTE_MIN(vb_avail, seg_avail);
-			}
-		}
-	}
-
-	return entry_success;
-}
-
-/*
- * This function adds buffers to the virtio devices RX virtqueue. Buffers can
- * be received from the physical port or from another virtio device. A packet
- * count is returned to indicate the number of packets that were succesfully
- * added to the RX queue. This function works for mergeable RX.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_merge_rx(struct virtio_net *dev, struct rte_mbuf **pkts,
-	uint32_t count)
-{
-	struct vhost_virtqueue *vq;
-	uint32_t pkt_idx = 0, entry_success = 0;
-	uint32_t retry = 0;
-	uint16_t avail_idx, res_cur_idx;
-	uint16_t res_base_idx, res_end_idx;
-	uint8_t success = 0;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_rx()\n",
-		dev->device_fh);
-	vq = dev->virtqueue[VIRTIO_RXQ];
-	count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
-
-	if (count == 0)
-		return 0;
-
-	for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
-		uint32_t secure_len = 0;
-		uint16_t need_cnt;
-		uint32_t vec_idx = 0;
-		uint32_t pkt_len = pkts[pkt_idx]->pkt.pkt_len + vq->vhost_hlen;
-		uint16_t i, id;
-
-		do {
-			/*
-			 * As many data cores may want access to available
-			 * buffers, they need to be reserved.
-			 */
-			res_base_idx = vq->last_used_idx_res;
-			res_cur_idx = res_base_idx;
-
-			do {
-				avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-				if (unlikely(res_cur_idx == avail_idx)) {
-					/*
-					 * If retry is enabled and the queue is
-					 * full then we wait and retry to avoid
-					 * packet loss.
-					 */
-					if (enable_retry) {
-						uint8_t cont = 0;
-						for (retry = 0; retry < burst_rx_retry_num; retry++) {
-							rte_delay_us(burst_rx_delay_time);
-							avail_idx =
-								*((volatile uint16_t *)&vq->avail->idx);
-							if (likely(res_cur_idx != avail_idx)) {
-								cont = 1;
-								break;
-							}
-						}
-						if (cont == 1)
-							continue;
-					}
-
-					LOG_DEBUG(VHOST_DATA,
-						"(%"PRIu64") Failed "
-						"to get enough desc from "
-						"vring\n",
-						dev->device_fh);
-					return pkt_idx;
-				} else {
-					uint16_t wrapped_idx =
-						(res_cur_idx) & (vq->size - 1);
-					uint32_t idx =
-						vq->avail->ring[wrapped_idx];
-					uint8_t next_desc;
-
-					do {
-						next_desc = 0;
-						secure_len += vq->desc[idx].len;
-						if (vq->desc[idx].flags &
-							VRING_DESC_F_NEXT) {
-							idx = vq->desc[idx].next;
-							next_desc = 1;
-						}
-					} while (next_desc);
-
-					res_cur_idx++;
-				}
-			} while (pkt_len > secure_len);
-
-			/* vq->last_used_idx_res is atomically updated. */
-			success = rte_atomic16_cmpset(&vq->last_used_idx_res,
-							res_base_idx,
-							res_cur_idx);
-		} while (success == 0);
-
-		id = res_base_idx;
-		need_cnt = res_cur_idx - res_base_idx;
-
-		for (i = 0; i < need_cnt; i++, id++) {
-			uint16_t wrapped_idx = id & (vq->size - 1);
-			uint32_t idx = vq->avail->ring[wrapped_idx];
-			uint8_t next_desc;
-			do {
-				next_desc = 0;
-				vq->buf_vec[vec_idx].buf_addr =
-					vq->desc[idx].addr;
-				vq->buf_vec[vec_idx].buf_len =
-					vq->desc[idx].len;
-				vq->buf_vec[vec_idx].desc_idx = idx;
-				vec_idx++;
-
-				if (vq->desc[idx].flags & VRING_DESC_F_NEXT) {
-					idx = vq->desc[idx].next;
-					next_desc = 1;
-				}
-			} while (next_desc);
-		}
-
-		res_end_idx = res_cur_idx;
-
-		entry_success = copy_from_mbuf_to_vring(dev, res_base_idx,
-			res_end_idx, pkts[pkt_idx]);
-
-		rte_compiler_barrier();
-
-		/*
-		 * Wait until it's our turn to add our buffer
-		 * to the used ring.
-		 */
-		while (unlikely(vq->last_used_idx != res_base_idx))
-			rte_pause();
-
-		*(volatile uint16_t *)&vq->used->idx += entry_success;
-		vq->last_used_idx = res_end_idx;
-
-		/* Kick the guest if necessary. */
-		if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-			eventfd_write((int)vq->kickfd, 1);
-	}
-
-	return count;
-}
-
-/*
- * Compares a packet destination MAC address to a device MAC address.
- */
-static inline int __attribute__((always_inline))
-ether_addr_cmp(struct ether_addr *ea, struct ether_addr *eb)
-{
-	return (((*(uint64_t *)ea ^ *(uint64_t *)eb) & MAC_ADDR_CMP) == 0);
-}
-
-/*
- * This function learns the MAC address of the device and registers this along with a
- * vlan tag to a VMDQ.
- */
-static int
-link_vmdq(struct virtio_net *dev, struct rte_mbuf *m)
-{
-	struct ether_hdr *pkt_hdr;
-	struct virtio_net_data_ll *dev_ll;
-	int i, ret;
-
-	/* Learn MAC address of guest device from packet */
-	pkt_hdr = (struct ether_hdr *)m->pkt.data;
-
-	dev_ll = ll_root_used;
-
-	while (dev_ll != NULL) {
-		if (ether_addr_cmp(&(pkt_hdr->s_addr), &dev_ll->dev->mac_address)) {
-			RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") WARNING: This device is using an existing MAC address and has not been registered.\n", dev->device_fh);
-			return -1;
-		}
-		dev_ll = dev_ll->next;
-	}
-
-	for (i = 0; i < ETHER_ADDR_LEN; i++)
-		dev->mac_address.addr_bytes[i] = pkt_hdr->s_addr.addr_bytes[i];
-
-	/* vlan_tag currently uses the device_id. */
-	dev->vlan_tag = vlan_tags[dev->device_fh];
-
-	/* Print out VMDQ registration info. */
-	RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") MAC_ADDRESS %02x:%02x:%02x:%02x:%02x:%02x and VLAN_TAG %d registered\n",
-		dev->device_fh,
-		dev->mac_address.addr_bytes[0], dev->mac_address.addr_bytes[1],
-		dev->mac_address.addr_bytes[2], dev->mac_address.addr_bytes[3],
-		dev->mac_address.addr_bytes[4], dev->mac_address.addr_bytes[5],
-		dev->vlan_tag);
-
-	/* Register the MAC address. */
-	ret = rte_eth_dev_mac_addr_add(ports[0], &dev->mac_address, (uint32_t)dev->device_fh);
-	if (ret)
-		RTE_LOG(ERR, VHOST_DATA, "(%"PRIu64") Failed to add device MAC address to VMDQ\n",
-					dev->device_fh);
-
-	/* Enable stripping of the vlan tag as we handle routing. */
-	rte_eth_dev_set_vlan_strip_on_queue(ports[0], (uint16_t)dev->vmdq_rx_q, 1);
-
-	/* Set device as ready for RX. */
-	dev->ready = DEVICE_RX;
-
-	return 0;
-}
-
-/*
- * Removes MAC address and vlan tag from VMDQ. Ensures that nothing is adding buffers to the RX
- * queue before disabling RX on the device.
- */
-static inline void
-unlink_vmdq(struct virtio_net *dev)
-{
-	unsigned i = 0;
-	unsigned rx_count;
-	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
-
-	if (dev->ready == DEVICE_RX) {
-		/*clear MAC and VLAN settings*/
-		rte_eth_dev_mac_addr_remove(ports[0], &dev->mac_address);
-		for (i = 0; i < 6; i++)
-			dev->mac_address.addr_bytes[i] = 0;
-
-		dev->vlan_tag = 0;
-
-		/*Clear out the receive buffers*/
-		rx_count = rte_eth_rx_burst(ports[0],
-					(uint16_t)dev->vmdq_rx_q, pkts_burst, MAX_PKT_BURST);
-
-		while (rx_count) {
-			for (i = 0; i < rx_count; i++)
-				rte_pktmbuf_free(pkts_burst[i]);
-
-			rx_count = rte_eth_rx_burst(ports[0],
-					(uint16_t)dev->vmdq_rx_q, pkts_burst, MAX_PKT_BURST);
-		}
-
-		dev->ready = DEVICE_MAC_LEARNING;
-	}
-}
-
-/*
- * Check if the packet destination MAC address is for a local device. If so then put
- * the packet on that devices RX queue. If not then return.
- */
-static inline unsigned __attribute__((always_inline))
-virtio_tx_local(struct virtio_net *dev, struct rte_mbuf *m)
-{
-	struct virtio_net_data_ll *dev_ll;
-	struct ether_hdr *pkt_hdr;
-	uint64_t ret = 0;
-
-	pkt_hdr = (struct ether_hdr *)m->pkt.data;
-
-	/*get the used devices list*/
-	dev_ll = ll_root_used;
-
-	while (dev_ll != NULL) {
-		if ((dev_ll->dev->ready == DEVICE_RX) && ether_addr_cmp(&(pkt_hdr->d_addr),
-				          &dev_ll->dev->mac_address)) {
-
-			/* Drop the packet if the TX packet is destined for the TX device. */
-			if (dev_ll->dev->device_fh == dev->device_fh) {
-				LOG_DEBUG(VHOST_DATA, "(%"PRIu64") TX: Source and destination MAC addresses are the same. Dropping packet.\n",
-							dev_ll->dev->device_fh);
-				return 0;
-			}
-
-
-			LOG_DEBUG(VHOST_DATA, "(%"PRIu64") TX: MAC address is local\n", dev_ll->dev->device_fh);
-
-			if (dev_ll->dev->remove) {
-				/*drop the packet if the device is marked for removal*/
-				LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Device is marked for removal\n", dev_ll->dev->device_fh);
-			} else {
-				uint32_t mergeable =
-					dev_ll->dev->features &
-					(1 << VIRTIO_NET_F_MRG_RXBUF);
-
-				/*send the packet to the local virtio device*/
-				if (likely(mergeable == 0))
-					ret = virtio_dev_rx(dev_ll->dev, &m, 1);
-				else
-					ret = virtio_dev_merge_rx(dev_ll->dev,
-						&m, 1);
-
-				if (enable_stats) {
-					rte_atomic64_add(
-					&dev_statistics[dev_ll->dev->device_fh].rx_total_atomic,
-					1);
-					rte_atomic64_add(
-					&dev_statistics[dev_ll->dev->device_fh].rx_atomic,
-					ret);
-					dev_statistics[dev->device_fh].tx_total++;
-					dev_statistics[dev->device_fh].tx += ret;
-				}
-			}
-
-			return 0;
-		}
-		dev_ll = dev_ll->next;
-	}
-
-	return -1;
-}
-
-/*
- * This function routes the TX packet to the correct interface. This may be a local device
- * or the physical port.
- */
-static inline void __attribute__((always_inline))
-virtio_tx_route(struct virtio_net* dev, struct rte_mbuf *m, struct rte_mempool *mbuf_pool, uint16_t vlan_tag)
-{
-	struct mbuf_table *tx_q;
-	struct vlan_ethhdr *vlan_hdr;
-	struct rte_mbuf **m_table;
-	struct rte_mbuf *mbuf, *prev;
-	unsigned len, ret, offset = 0;
-	const uint16_t lcore_id = rte_lcore_id();
-	struct virtio_net_data_ll *dev_ll = ll_root_used;
-	struct ether_hdr *pkt_hdr = (struct ether_hdr *)m->pkt.data;
-
-	/*check if destination is local VM*/
-	if ((vm2vm_mode == VM2VM_SOFTWARE) && (virtio_tx_local(dev, m) == 0))
-		return;
-
-	if (vm2vm_mode == VM2VM_HARDWARE) {
-		while (dev_ll != NULL) {
-			if ((dev_ll->dev->ready == DEVICE_RX)
-				&& ether_addr_cmp(&(pkt_hdr->d_addr),
-				&dev_ll->dev->mac_address)) {
-				/*
-				 * Drop the packet if the TX packet is
-				 * destined for the TX device.
-				 */
-				if (dev_ll->dev->device_fh == dev->device_fh) {
-					LOG_DEBUG(VHOST_DATA,
-					"(%"PRIu64") TX: Source and destination"
-					" MAC addresses are the same. Dropping "
-					"packet.\n",
-					dev_ll->dev->device_fh);
-					return;
-				}
-				offset = 4;
-				vlan_tag =
-				(uint16_t)
-				vlan_tags[(uint16_t)dev_ll->dev->device_fh];
-
-				LOG_DEBUG(VHOST_DATA,
-				"(%"PRIu64") TX: pkt to local VM device id:"
-				"(%"PRIu64") vlan tag: %d.\n",
-				dev->device_fh, dev_ll->dev->device_fh,
-				vlan_tag);
-
-				break;
-			}
-			dev_ll = dev_ll->next;
-		}
-	}
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") TX: MAC address is external\n", dev->device_fh);
-
-	/*Add packet to the port tx queue*/
-	tx_q = &lcore_tx_queue[lcore_id];
-	len = tx_q->len;
-
-	/* Allocate an mbuf and populate the structure. */
-	mbuf = rte_pktmbuf_alloc(mbuf_pool);
-	if (unlikely(mbuf == NULL)) {
-		RTE_LOG(ERR, VHOST_DATA,
-			"Failed to allocate memory for mbuf.\n");
-		return;
-	}
-
-	mbuf->pkt.data_len = m->pkt.data_len + VLAN_HLEN + offset;
-	mbuf->pkt.pkt_len = m->pkt.pkt_len + VLAN_HLEN + offset;
-	mbuf->pkt.nb_segs = m->pkt.nb_segs;
-
-	/* Copy ethernet header to mbuf. */
-	rte_memcpy((void*)mbuf->pkt.data, (const void*)m->pkt.data, ETH_HLEN);
-
-
-	/* Setup vlan header. Bytes need to be re-ordered for network with htons()*/
-	vlan_hdr = (struct vlan_ethhdr *) mbuf->pkt.data;
-	vlan_hdr->h_vlan_encapsulated_proto = vlan_hdr->h_vlan_proto;
-	vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
-	vlan_hdr->h_vlan_TCI = htons(vlan_tag);
-
-	/* Copy the remaining packet contents to the mbuf. */
-	rte_memcpy((void*) ((uint8_t*)mbuf->pkt.data + VLAN_ETH_HLEN),
-		(const void*) ((uint8_t*)m->pkt.data + ETH_HLEN), (m->pkt.data_len - ETH_HLEN));
-
-	/* Copy the remaining segments for the whole packet. */
-	prev = mbuf;
-	while (m->pkt.next) {
-		/* Allocate an mbuf and populate the structure. */
-		struct rte_mbuf *next_mbuf = rte_pktmbuf_alloc(mbuf_pool);
-		if (unlikely(next_mbuf == NULL)) {
-			rte_pktmbuf_free(mbuf);
-			RTE_LOG(ERR, VHOST_DATA,
-				"Failed to allocate memory for mbuf.\n");
-			return;
-		}
-
-		m = m->pkt.next;
-		prev->pkt.next = next_mbuf;
-		prev = next_mbuf;
-		next_mbuf->pkt.data_len = m->pkt.data_len;
-
-		/* Copy data to next mbuf. */
-		rte_memcpy(rte_pktmbuf_mtod(next_mbuf, void *),
-			rte_pktmbuf_mtod(m, const void *), m->pkt.data_len);
-	}
-
-	tx_q->m_table[len] = mbuf;
-	len++;
-	if (enable_stats) {
-		dev_statistics[dev->device_fh].tx_total++;
-		dev_statistics[dev->device_fh].tx++;
-	}
-
-	if (unlikely(len == MAX_PKT_BURST)) {
-		m_table = (struct rte_mbuf **)tx_q->m_table;
-		ret = rte_eth_tx_burst(ports[0], (uint16_t)tx_q->txq_id, m_table, (uint16_t) len);
-		/* Free any buffers not handled by TX and update the port stats. */
-		if (unlikely(ret < len)) {
-			do {
-				rte_pktmbuf_free(m_table[ret]);
-			} while (++ret < len);
-		}
-
-		len = 0;
-	}
-
-	tx_q->len = len;
-	return;
-}
-
-static inline void __attribute__((always_inline))
-virtio_dev_tx(struct virtio_net* dev, struct rte_mempool *mbuf_pool)
-{
-	struct rte_mbuf m;
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	uint64_t buff_addr = 0;
-	uint32_t head[MAX_PKT_BURST];
-	uint32_t used_idx;
-	uint32_t i;
-	uint16_t free_entries, packet_success = 0;
-	uint16_t avail_idx;
-
-	vq = dev->virtqueue[VIRTIO_TXQ];
-	avail_idx =  *((volatile uint16_t *)&vq->avail->idx);
-
-	/* If there are no available buffers then return. */
-	if (vq->last_used_idx == avail_idx)
-		return;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_tx()\n", dev->device_fh);
-
-	/* Prefetch available ring to retrieve head indexes. */
-	rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
-
-	/*get the number of free entries in the ring*/
-	free_entries = (avail_idx - vq->last_used_idx);
-
-	/* Limit to MAX_PKT_BURST. */
-	if (free_entries > MAX_PKT_BURST)
-		free_entries = MAX_PKT_BURST;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n", dev->device_fh, free_entries);
-	/* Retrieve all of the head indexes first to avoid caching issues. */
-	for (i = 0; i < free_entries; i++)
-		head[i] = vq->avail->ring[(vq->last_used_idx + i) & (vq->size - 1)];
-
-	/* Prefetch descriptor index. */
-	rte_prefetch0(&vq->desc[head[packet_success]]);
-	rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
-
-	while (packet_success < free_entries) {
-		desc = &vq->desc[head[packet_success]];
-
-		/* Discard first buffer as it is the virtio header */
-		desc = &vq->desc[desc->next];
-
-		/* Buffer address translation. */
-		buff_addr = gpa_to_vva(dev, desc->addr);
-		/* Prefetch buffer address. */
-		rte_prefetch0((void*)(uintptr_t)buff_addr);
-
-		used_idx = vq->last_used_idx & (vq->size - 1);
-
-		if (packet_success < (free_entries - 1)) {
-			/* Prefetch descriptor index. */
-			rte_prefetch0(&vq->desc[head[packet_success+1]]);
-			rte_prefetch0(&vq->used->ring[(used_idx + 1) & (vq->size - 1)]);
-		}
-
-		/* Update used index buffer information. */
-		vq->used->ring[used_idx].id = head[packet_success];
-		vq->used->ring[used_idx].len = 0;
-
-		/* Setup dummy mbuf. This is copied to a real mbuf if transmitted out the physical port. */
-		m.pkt.data_len = desc->len;
-		m.pkt.pkt_len = desc->len;
-		m.pkt.data = (void*)(uintptr_t)buff_addr;
-
-		PRINT_PACKET(dev, (uintptr_t)buff_addr, desc->len, 0);
-
-		/* If this is the first received packet we need to learn the MAC and setup VMDQ */
-		if (dev->ready == DEVICE_MAC_LEARNING) {
-			if (dev->remove || (link_vmdq(dev, &m) == -1)) {
-				/*discard frame if device is scheduled for removal or a duplicate MAC address is found. */
-				packet_success += free_entries;
-				vq->last_used_idx += packet_success;
-				break;
-			}
-		}
-		virtio_tx_route(dev, &m, mbuf_pool, (uint16_t)dev->device_fh);
-
-		vq->last_used_idx++;
-		packet_success++;
-	}
-
-	rte_compiler_barrier();
-	vq->used->idx += packet_success;
-	/* Kick guest if required. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-}
-
-/* This function works for TX packets with mergeable feature enabled. */
-static inline void __attribute__((always_inline))
-virtio_dev_merge_tx(struct virtio_net *dev, struct rte_mempool *mbuf_pool)
-{
-	struct rte_mbuf *m, *prev;
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	uint64_t vb_addr = 0;
-	uint32_t head[MAX_PKT_BURST];
-	uint32_t used_idx;
-	uint32_t i;
-	uint16_t free_entries, entry_success = 0;
-	uint16_t avail_idx;
-	uint32_t buf_size = MBUF_SIZE - (sizeof(struct rte_mbuf)
-			+ RTE_PKTMBUF_HEADROOM);
-
-	vq = dev->virtqueue[VIRTIO_TXQ];
-	avail_idx =  *((volatile uint16_t *)&vq->avail->idx);
-
-	/* If there are no available buffers then return. */
-	if (vq->last_used_idx == avail_idx)
-		return;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_tx()\n",
-		dev->device_fh);
-
-	/* Prefetch available ring to retrieve head indexes. */
-	rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
-
-	/*get the number of free entries in the ring*/
-	free_entries = (avail_idx - vq->last_used_idx);
-
-	/* Limit to MAX_PKT_BURST. */
-	free_entries = RTE_MIN(free_entries, MAX_PKT_BURST);
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n",
-		dev->device_fh, free_entries);
-	/* Retrieve all of the head indexes first to avoid caching issues. */
-	for (i = 0; i < free_entries; i++)
-		head[i] = vq->avail->ring[(vq->last_used_idx + i) & (vq->size - 1)];
-
-	/* Prefetch descriptor index. */
-	rte_prefetch0(&vq->desc[head[entry_success]]);
-	rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
-
-	while (entry_success < free_entries) {
-		uint32_t vb_avail, vb_offset;
-		uint32_t seg_avail, seg_offset;
-		uint32_t cpy_len;
-		uint32_t seg_num = 0;
-		struct rte_mbuf *cur;
-		uint8_t alloc_err = 0;
-
-		desc = &vq->desc[head[entry_success]];
-
-		/* Discard first buffer as it is the virtio header */
-		desc = &vq->desc[desc->next];
-
-		/* Buffer address translation. */
-		vb_addr = gpa_to_vva(dev, desc->addr);
-		/* Prefetch buffer address. */
-		rte_prefetch0((void *)(uintptr_t)vb_addr);
-
-		used_idx = vq->last_used_idx & (vq->size - 1);
-
-		if (entry_success < (free_entries - 1)) {
-			/* Prefetch descriptor index. */
-			rte_prefetch0(&vq->desc[head[entry_success+1]]);
-			rte_prefetch0(&vq->used->ring[(used_idx + 1) & (vq->size - 1)]);
-		}
-
-		/* Update used index buffer information. */
-		vq->used->ring[used_idx].id = head[entry_success];
-		vq->used->ring[used_idx].len = 0;
-
-		vb_offset = 0;
-		vb_avail = desc->len;
-		seg_offset = 0;
-		seg_avail = buf_size;
-		cpy_len = RTE_MIN(vb_avail, seg_avail);
-
-		PRINT_PACKET(dev, (uintptr_t)vb_addr, desc->len, 0);
-
-		/* Allocate an mbuf and populate the structure. */
-		m = rte_pktmbuf_alloc(mbuf_pool);
-		if (unlikely(m == NULL)) {
-			RTE_LOG(ERR, VHOST_DATA,
-				"Failed to allocate memory for mbuf.\n");
-			return;
-		}
-
-		seg_num++;
-		cur = m;
-		prev = m;
-		while (cpy_len != 0) {
-			rte_memcpy((void *)(rte_pktmbuf_mtod(cur, char *) + seg_offset),
-				(void *)((uintptr_t)(vb_addr + vb_offset)),
-				cpy_len);
-
-			seg_offset += cpy_len;
-			vb_offset += cpy_len;
-			vb_avail -= cpy_len;
-			seg_avail -= cpy_len;
-
-			if (vb_avail != 0) {
-				/*
-				 * The segment reachs to its end,
-				 * while the virtio buffer in TX vring has
-				 * more data to be copied.
-				 */
-				cur->pkt.data_len = seg_offset;
-				m->pkt.pkt_len += seg_offset;
-				/* Allocate mbuf and populate the structure. */
-				cur = rte_pktmbuf_alloc(mbuf_pool);
-				if (unlikely(cur == NULL)) {
-					RTE_LOG(ERR, VHOST_DATA, "Failed to "
-						"allocate memory for mbuf.\n");
-					rte_pktmbuf_free(m);
-					alloc_err = 1;
-					break;
-				}
-
-				seg_num++;
-				prev->pkt.next = cur;
-				prev = cur;
-				seg_offset = 0;
-				seg_avail = buf_size;
-			} else {
-				if (desc->flags & VRING_DESC_F_NEXT) {
-					/*
-					 * There are more virtio buffers in
-					 * same vring entry need to be copied.
-					 */
-					if (seg_avail == 0) {
-						/*
-						 * The current segment hasn't
-						 * room to accomodate more
-						 * data.
-						 */
-						cur->pkt.data_len = seg_offset;
-						m->pkt.pkt_len += seg_offset;
-						/*
-						 * Allocate an mbuf and
-						 * populate the structure.
-						 */
-						cur = rte_pktmbuf_alloc(mbuf_pool);
-						if (unlikely(cur == NULL)) {
-							RTE_LOG(ERR,
-								VHOST_DATA,
-								"Failed to "
-								"allocate memory "
-								"for mbuf\n");
-							rte_pktmbuf_free(m);
-							alloc_err = 1;
-							break;
-						}
-						seg_num++;
-						prev->pkt.next = cur;
-						prev = cur;
-						seg_offset = 0;
-						seg_avail = buf_size;
-					}
-
-					desc = &vq->desc[desc->next];
-
-					/* Buffer address translation. */
-					vb_addr = gpa_to_vva(dev, desc->addr);
-					/* Prefetch buffer address. */
-					rte_prefetch0((void *)(uintptr_t)vb_addr);
-					vb_offset = 0;
-					vb_avail = desc->len;
-
-					PRINT_PACKET(dev, (uintptr_t)vb_addr,
-						desc->len, 0);
-				} else {
-					/* The whole packet completes. */
-					cur->pkt.data_len = seg_offset;
-					m->pkt.pkt_len += seg_offset;
-					vb_avail = 0;
-				}
-			}
-
-			cpy_len = RTE_MIN(vb_avail, seg_avail);
-		}
-
-		if (unlikely(alloc_err == 1))
-			break;
-
-		m->pkt.nb_segs = seg_num;
-
-		/*
-		 * If this is the first received packet we need to learn
-		 * the MAC and setup VMDQ
-		 */
-		if (dev->ready == DEVICE_MAC_LEARNING) {
-			if (dev->remove || (link_vmdq(dev, m) == -1)) {
-				/*
-				 * Discard frame if device is scheduled for
-				 * removal or a duplicate MAC address is found.
-				 */
-				entry_success = free_entries;
-				vq->last_used_idx += entry_success;
-				rte_pktmbuf_free(m);
-				break;
-			}
-		}
-
-		virtio_tx_route(dev, m, mbuf_pool, (uint16_t)dev->device_fh);
-		vq->last_used_idx++;
-		entry_success++;
-		rte_pktmbuf_free(m);
-	}
-
-	rte_compiler_barrier();
-	vq->used->idx += entry_success;
-	/* Kick guest if required. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-
-}
-
-/*
- * This function is called by each data core. It handles all RX/TX registered with the
- * core. For TX the specific lcore linked list is used. For RX, MAC addresses are compared
- * with all devices in the main linked list.
- */
-static int
-switch_worker(__attribute__((unused)) void *arg)
-{
-	struct rte_mempool *mbuf_pool = arg;
-	struct virtio_net *dev = NULL;
-	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
-	struct virtio_net_data_ll *dev_ll;
-	struct mbuf_table *tx_q;
-	volatile struct lcore_ll_info *lcore_ll;
-	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;
-	uint64_t prev_tsc, diff_tsc, cur_tsc, ret_count = 0;
-	unsigned ret, i;
-	const uint16_t lcore_id = rte_lcore_id();
-	const uint16_t num_cores = (uint16_t)rte_lcore_count();
-	uint16_t rx_count = 0;
-	uint32_t mergeable = 0;
-
-	RTE_LOG(INFO, VHOST_DATA, "Procesing on Core %u started\n", lcore_id);
-	lcore_ll = lcore_info[lcore_id].lcore_ll;
-	prev_tsc = 0;
-
-	tx_q = &lcore_tx_queue[lcore_id];
-	for (i = 0; i < num_cores; i ++) {
-		if (lcore_ids[i] == lcore_id) {
-			tx_q->txq_id = i;
-			break;
-		}
-	}
-
-	while(1) {
-		cur_tsc = rte_rdtsc();
-		/*
-		 * TX burst queue drain
-		 */
-		diff_tsc = cur_tsc - prev_tsc;
-		if (unlikely(diff_tsc > drain_tsc)) {
-
-			if (tx_q->len) {
-				LOG_DEBUG(VHOST_DATA, "TX queue drained after timeout with burst size %u \n", tx_q->len);
-
-				/*Tx any packets in the queue*/
-				ret = rte_eth_tx_burst(ports[0], (uint16_t)tx_q->txq_id,
-									   (struct rte_mbuf **)tx_q->m_table,
-									   (uint16_t)tx_q->len);
-				if (unlikely(ret < tx_q->len)) {
-					do {
-						rte_pktmbuf_free(tx_q->m_table[ret]);
-					} while (++ret < tx_q->len);
-				}
-
-				tx_q->len = 0;
-			}
-
-			prev_tsc = cur_tsc;
-
-		}
-
-		rte_prefetch0(lcore_ll->ll_root_used);
-		/*
-		 * Inform the configuration core that we have exited the linked list and that no devices are
-		 * in use if requested.
-		 */
-		if (lcore_ll->dev_removal_flag == REQUEST_DEV_REMOVAL)
-			lcore_ll->dev_removal_flag = ACK_DEV_REMOVAL;
-
-		/*
-		 * Process devices
-		 */
-		dev_ll = lcore_ll->ll_root_used;
-
-		while (dev_ll != NULL) {
-			/*get virtio device ID*/
-			dev = dev_ll->dev;
-			mergeable =
-				dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF);
-
-			if (dev->remove) {
-				dev_ll = dev_ll->next;
-				unlink_vmdq(dev);
-				dev->ready = DEVICE_SAFE_REMOVE;
-				continue;
-			}
-			if (likely(dev->ready == DEVICE_RX)) {
-				/*Handle guest RX*/
-				rx_count = rte_eth_rx_burst(ports[0],
-					(uint16_t)dev->vmdq_rx_q, pkts_burst, MAX_PKT_BURST);
-
-				if (rx_count) {
-					if (likely(mergeable == 0))
-						ret_count =
-							virtio_dev_rx(dev,
-							pkts_burst, rx_count);
-					else
-						ret_count =
-							virtio_dev_merge_rx(dev,
-							pkts_burst, rx_count);
-
-					if (enable_stats) {
-						rte_atomic64_add(
-						&dev_statistics[dev_ll->dev->device_fh].rx_total_atomic,
-						rx_count);
-						rte_atomic64_add(
-						&dev_statistics[dev_ll->dev->device_fh].rx_atomic, ret_count);
-					}
-					while (likely(rx_count)) {
-						rx_count--;
-						rte_pktmbuf_free(pkts_burst[rx_count]);
-					}
-
-				}
-			}
-
-			if (!dev->remove) {
-				/*Handle guest TX*/
-				if (likely(mergeable == 0))
-					virtio_dev_tx(dev, mbuf_pool);
-				else
-					virtio_dev_merge_tx(dev, mbuf_pool);
-			}
-
-			/*move to the next device in the list*/
-			dev_ll = dev_ll->next;
-		}
-	}
-
-	return 0;
-}
-
-/*
- * This function gets available ring number for zero copy rx.
- * Only one thread will call this funciton for a paticular virtio device,
- * so, it is designed as non-thread-safe function.
- */
-static inline uint32_t __attribute__((always_inline))
-get_available_ring_num_zcp(struct virtio_net *dev)
-{
-	struct vhost_virtqueue *vq = dev->virtqueue[VIRTIO_RXQ];
-	uint16_t avail_idx;
-
-	avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-	return (uint32_t)(avail_idx - vq->last_used_idx_res);
-}
-
-/*
- * This function gets available ring index for zero copy rx,
- * it will retry 'burst_rx_retry_num' times till it get enough ring index.
- * Only one thread will call this funciton for a paticular virtio device,
- * so, it is designed as non-thread-safe function.
- */
-static inline uint32_t __attribute__((always_inline))
-get_available_ring_index_zcp(struct virtio_net *dev,
-	uint16_t *res_base_idx, uint32_t count)
-{
-	struct vhost_virtqueue *vq = dev->virtqueue[VIRTIO_RXQ];
-	uint16_t avail_idx;
-	uint32_t retry = 0;
-	uint16_t free_entries;
-
-	*res_base_idx = vq->last_used_idx_res;
-	avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-	free_entries = (avail_idx - *res_base_idx);
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") in get_available_ring_index_zcp: "
-			"avail idx: %d, "
-			"res base idx:%d, free entries:%d\n",
-			dev->device_fh, avail_idx, *res_base_idx,
-			free_entries);
-
-	/*
-	 * If retry is enabled and the queue is full then we wait
-	 * and retry to avoid packet loss.
-	 */
-	if (enable_retry && unlikely(count > free_entries)) {
-		for (retry = 0; retry < burst_rx_retry_num; retry++) {
-			rte_delay_us(burst_rx_delay_time);
-			avail_idx = *((volatile uint16_t *)&vq->avail->idx);
-			free_entries = (avail_idx - *res_base_idx);
-			if (count <= free_entries)
-				break;
-		}
-	}
-
-	/*check that we have enough buffers*/
-	if (unlikely(count > free_entries))
-		count = free_entries;
-
-	if (unlikely(count == 0)) {
-		LOG_DEBUG(VHOST_DATA,
-			"(%"PRIu64") Fail in get_available_ring_index_zcp: "
-			"avail idx: %d, res base idx:%d, free entries:%d\n",
-			dev->device_fh, avail_idx,
-			*res_base_idx, free_entries);
-		return 0;
-	}
-
-	vq->last_used_idx_res = *res_base_idx + count;
-
-	return count;
-}
-
-/*
- * This function put descriptor back to used list.
- */
-static inline void __attribute__((always_inline))
-put_desc_to_used_list_zcp(struct vhost_virtqueue *vq, uint16_t desc_idx)
-{
-	uint16_t res_cur_idx = vq->last_used_idx;
-	vq->used->ring[res_cur_idx & (vq->size - 1)].id = (uint32_t)desc_idx;
-	vq->used->ring[res_cur_idx & (vq->size - 1)].len = 0;
-	rte_compiler_barrier();
-	*(volatile uint16_t *)&vq->used->idx += 1;
-	vq->last_used_idx += 1;
-
-	/* Kick the guest if necessary. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-}
-
-/*
- * This function get available descriptor from vitio vring and un-attached mbuf
- * from vpool->ring, and then attach them together. It needs adjust the offset
- * for buff_addr and phys_addr accroding to PMD implementation, otherwise the
- * frame data may be put to wrong location in mbuf.
- */
-static inline void __attribute__((always_inline))
-attach_rxmbuf_zcp(struct virtio_net *dev)
-{
-	uint16_t res_base_idx, desc_idx;
-	uint64_t buff_addr, phys_addr;
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	struct rte_mbuf *mbuf = NULL;
-	struct vpool *vpool;
-	hpa_type addr_type;
-
-	vpool = &vpool_array[dev->vmdq_rx_q];
-	vq = dev->virtqueue[VIRTIO_RXQ];
-
-	do {
-		if (unlikely(get_available_ring_index_zcp(dev, &res_base_idx,
-				1) != 1))
-			return;
-		desc_idx = vq->avail->ring[(res_base_idx) & (vq->size - 1)];
-
-		desc = &vq->desc[desc_idx];
-		if (desc->flags & VRING_DESC_F_NEXT) {
-			desc = &vq->desc[desc->next];
-			buff_addr = gpa_to_vva(dev, desc->addr);
-			phys_addr = gpa_to_hpa(dev, desc->addr, desc->len,
-					&addr_type);
-		} else {
-			buff_addr = gpa_to_vva(dev,
-					desc->addr + vq->vhost_hlen);
-			phys_addr = gpa_to_hpa(dev,
-					desc->addr + vq->vhost_hlen,
-					desc->len, &addr_type);
-		}
-
-		if (unlikely(addr_type == PHYS_ADDR_INVALID)) {
-			RTE_LOG(ERR, VHOST_DATA, "(%"PRIu64") Invalid frame buffer"
-				" address found when attaching RX frame buffer"
-				" address!\n", dev->device_fh);
-			put_desc_to_used_list_zcp(vq, desc_idx);
-			continue;
-		}
-
-		/*
-		 * Check if the frame buffer address from guest crosses
-		 * sub-region or not.
-		 */
-		if (unlikely(addr_type == PHYS_ADDR_CROSS_SUBREG)) {
-			RTE_LOG(ERR, VHOST_DATA,
-				"(%"PRIu64") Frame buffer address cross "
-				"sub-regioin found when attaching RX frame "
-				"buffer address!\n",
-				dev->device_fh);
-			put_desc_to_used_list_zcp(vq, desc_idx);
-			continue;
-		}
-	} while (unlikely(phys_addr == 0));
-
-	rte_ring_sc_dequeue(vpool->ring, (void **)&mbuf);
-	if (unlikely(mbuf == NULL)) {
-		LOG_DEBUG(VHOST_DATA,
-			"(%"PRIu64") in attach_rxmbuf_zcp: "
-			"ring_sc_dequeue fail.\n",
-			dev->device_fh);
-		put_desc_to_used_list_zcp(vq, desc_idx);
-		return;
-	}
-
-	if (unlikely(vpool->buf_size > desc->len)) {
-		LOG_DEBUG(VHOST_DATA,
-			"(%"PRIu64") in attach_rxmbuf_zcp: frame buffer "
-			"length(%d) of descriptor idx: %d less than room "
-			"size required: %d\n",
-			dev->device_fh, desc->len, desc_idx, vpool->buf_size);
-		put_desc_to_used_list_zcp(vq, desc_idx);
-		rte_ring_sp_enqueue(vpool->ring, (void *)mbuf);
-		return;
-	}
-
-	mbuf->buf_addr = (void *)(uintptr_t)(buff_addr - RTE_PKTMBUF_HEADROOM);
-	mbuf->pkt.data = (void *)(uintptr_t)(buff_addr);
-	mbuf->buf_physaddr = phys_addr - RTE_PKTMBUF_HEADROOM;
-	mbuf->pkt.data_len = desc->len;
-	MBUF_HEADROOM_UINT32(mbuf) = (uint32_t)desc_idx;
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in attach_rxmbuf_zcp: res base idx:%d, "
-		"descriptor idx:%d\n",
-		dev->device_fh, res_base_idx, desc_idx);
-
-	__rte_mbuf_raw_free(mbuf);
-
-	return;
-}
-
-/*
- * Detach an attched packet mbuf -
- *  - restore original mbuf address and length values.
- *  - reset pktmbuf data and data_len to their default values.
- *  All other fields of the given packet mbuf will be left intact.
- *
- * @param m
- *   The attached packet mbuf.
- */
-static inline void pktmbuf_detach_zcp(struct rte_mbuf *m)
-{
-	const struct rte_mempool *mp = m->pool;
-	void *buf = RTE_MBUF_TO_BADDR(m);
-	uint32_t buf_ofs;
-	uint32_t buf_len = mp->elt_size - sizeof(*m);
-	m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof(*m);
-
-	m->buf_addr = buf;
-	m->buf_len = (uint16_t)buf_len;
-
-	buf_ofs = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
-			RTE_PKTMBUF_HEADROOM : m->buf_len;
-	m->pkt.data = (char *) m->buf_addr + buf_ofs;
-
-	m->pkt.data_len = 0;
-}
-
-/*
- * This function is called after packets have been transimited. It fetchs mbuf
- * from vpool->pool, detached it and put into vpool->ring. It also update the
- * used index and kick the guest if necessary.
- */
-static inline uint32_t __attribute__((always_inline))
-txmbuf_clean_zcp(struct virtio_net *dev, struct vpool *vpool)
-{
-	struct rte_mbuf *mbuf;
-	struct vhost_virtqueue *vq = dev->virtqueue[VIRTIO_TXQ];
-	uint32_t used_idx = vq->last_used_idx & (vq->size - 1);
-	uint32_t index = 0;
-	uint32_t mbuf_count = rte_mempool_count(vpool->pool);
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: mbuf count in mempool before "
-		"clean is: %d\n",
-		dev->device_fh, mbuf_count);
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: mbuf count in  ring before "
-		"clean  is : %d\n",
-		dev->device_fh, rte_ring_count(vpool->ring));
-
-	for (index = 0; index < mbuf_count; index++) {
-		mbuf = __rte_mbuf_raw_alloc(vpool->pool);
-		if (likely(RTE_MBUF_INDIRECT(mbuf)))
-			pktmbuf_detach_zcp(mbuf);
-		rte_ring_sp_enqueue(vpool->ring, mbuf);
-
-		/* Update used index buffer information. */
-		vq->used->ring[used_idx].id = MBUF_HEADROOM_UINT32(mbuf);
-		vq->used->ring[used_idx].len = 0;
-
-		used_idx = (used_idx + 1) & (vq->size - 1);
-	}
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: mbuf count in mempool after "
-		"clean is: %d\n",
-		dev->device_fh, rte_mempool_count(vpool->pool));
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: mbuf count in  ring after "
-		"clean  is : %d\n",
-		dev->device_fh, rte_ring_count(vpool->ring));
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: before updated "
-		"vq->last_used_idx:%d\n",
-		dev->device_fh, vq->last_used_idx);
-
-	vq->last_used_idx += mbuf_count;
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in txmbuf_clean_zcp: after updated "
-		"vq->last_used_idx:%d\n",
-		dev->device_fh, vq->last_used_idx);
-
-	rte_compiler_barrier();
-
-	*(volatile uint16_t *)&vq->used->idx += mbuf_count;
-
-	/* Kick guest if required. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-
-	return 0;
-}
-
-/*
- * This function is called when a virtio device is destroy.
- * It fetchs mbuf from vpool->pool, and detached it, and put into vpool->ring.
- */
-static void mbuf_destroy_zcp(struct vpool *vpool)
-{
-	struct rte_mbuf *mbuf = NULL;
-	uint32_t index, mbuf_count = rte_mempool_count(vpool->pool);
-
-	LOG_DEBUG(VHOST_CONFIG,
-		"in mbuf_destroy_zcp: mbuf count in mempool before "
-		"mbuf_destroy_zcp is: %d\n",
-		mbuf_count);
-	LOG_DEBUG(VHOST_CONFIG,
-		"in mbuf_destroy_zcp: mbuf count in  ring before "
-		"mbuf_destroy_zcp  is : %d\n",
-		rte_ring_count(vpool->ring));
-
-	for (index = 0; index < mbuf_count; index++) {
-		mbuf = __rte_mbuf_raw_alloc(vpool->pool);
-		if (likely(mbuf != NULL)) {
-			if (likely(RTE_MBUF_INDIRECT(mbuf)))
-				pktmbuf_detach_zcp(mbuf);
-			rte_ring_sp_enqueue(vpool->ring, (void *)mbuf);
-		}
-	}
-
-	LOG_DEBUG(VHOST_CONFIG,
-		"in mbuf_destroy_zcp: mbuf count in mempool after "
-		"mbuf_destroy_zcp is: %d\n",
-		rte_mempool_count(vpool->pool));
-	LOG_DEBUG(VHOST_CONFIG,
-		"in mbuf_destroy_zcp: mbuf count in ring after "
-		"mbuf_destroy_zcp is : %d\n",
-		rte_ring_count(vpool->ring));
-}
-
-/*
- * This function update the use flag and counter.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_rx_zcp(struct virtio_net *dev, struct rte_mbuf **pkts,
-	uint32_t count)
-{
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	struct rte_mbuf *buff;
-	/* The virtio_hdr is initialised to 0. */
-	struct virtio_net_hdr_mrg_rxbuf virtio_hdr
-		= {{0, 0, 0, 0, 0, 0}, 0};
-	uint64_t buff_hdr_addr = 0;
-	uint32_t head[MAX_PKT_BURST], packet_len = 0;
-	uint32_t head_idx, packet_success = 0;
-	uint16_t res_cur_idx;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
-
-	if (count == 0)
-		return 0;
-
-	vq = dev->virtqueue[VIRTIO_RXQ];
-	count = (count > MAX_PKT_BURST) ? MAX_PKT_BURST : count;
-
-	res_cur_idx = vq->last_used_idx;
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| End Index %d\n",
-		dev->device_fh, res_cur_idx, res_cur_idx + count);
-
-	/* Retrieve all of the head indexes first to avoid caching issues. */
-	for (head_idx = 0; head_idx < count; head_idx++)
-		head[head_idx] = MBUF_HEADROOM_UINT32(pkts[head_idx]);
-
-	/*Prefetch descriptor index. */
-	rte_prefetch0(&vq->desc[head[packet_success]]);
-
-	while (packet_success != count) {
-		/* Get descriptor from available ring */
-		desc = &vq->desc[head[packet_success]];
-
-		buff = pkts[packet_success];
-		LOG_DEBUG(VHOST_DATA,
-			"(%"PRIu64") in dev_rx_zcp: update the used idx for "
-			"pkt[%d] descriptor idx: %d\n",
-			dev->device_fh, packet_success,
-			MBUF_HEADROOM_UINT32(buff));
-
-		PRINT_PACKET(dev,
-			(uintptr_t)(((uint64_t)(uintptr_t)buff->buf_addr)
-			+ RTE_PKTMBUF_HEADROOM),
-			rte_pktmbuf_data_len(buff), 0);
-
-		/* Buffer address translation for virtio header. */
-		buff_hdr_addr = gpa_to_vva(dev, desc->addr);
-		packet_len = rte_pktmbuf_data_len(buff) + vq->vhost_hlen;
-
-		/*
-		 * If the descriptors are chained the header and data are
-		 * placed in separate buffers.
-		 */
-		if (desc->flags & VRING_DESC_F_NEXT) {
-			desc->len = vq->vhost_hlen;
-			desc = &vq->desc[desc->next];
-			desc->len = rte_pktmbuf_data_len(buff);
-		} else {
-			desc->len = packet_len;
-		}
-
-		/* Update used ring with desc information */
-		vq->used->ring[res_cur_idx & (vq->size - 1)].id
-			= head[packet_success];
-		vq->used->ring[res_cur_idx & (vq->size - 1)].len
-			= packet_len;
-		res_cur_idx++;
-		packet_success++;
-
-		/* A header is required per buffer. */
-		rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
-			(const void *)&virtio_hdr, vq->vhost_hlen);
-
-		PRINT_PACKET(dev, (uintptr_t)buff_hdr_addr, vq->vhost_hlen, 1);
-
-		if (likely(packet_success < count)) {
-			/* Prefetch descriptor index. */
-			rte_prefetch0(&vq->desc[head[packet_success]]);
-		}
-	}
-
-	rte_compiler_barrier();
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in dev_rx_zcp: before update used idx: "
-		"vq.last_used_idx: %d, vq->used->idx: %d\n",
-		dev->device_fh, vq->last_used_idx, vq->used->idx);
-
-	*(volatile uint16_t *)&vq->used->idx += count;
-	vq->last_used_idx += count;
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in dev_rx_zcp: after  update used idx: "
-		"vq.last_used_idx: %d, vq->used->idx: %d\n",
-		dev->device_fh, vq->last_used_idx, vq->used->idx);
-
-	/* Kick the guest if necessary. */
-	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
-		eventfd_write((int)vq->kickfd, 1);
-
-	return count;
-}
-
-/*
- * This function routes the TX packet to the correct interface.
- * This may be a local device or the physical port.
- */
-static inline void __attribute__((always_inline))
-virtio_tx_route_zcp(struct virtio_net *dev, struct rte_mbuf *m,
-	uint32_t desc_idx, uint8_t need_copy)
-{
-	struct mbuf_table *tx_q;
-	struct rte_mbuf **m_table;
-	struct rte_mbuf *mbuf = NULL;
-	unsigned len, ret, offset = 0;
-	struct vpool *vpool;
-	struct virtio_net_data_ll *dev_ll = ll_root_used;
-	struct ether_hdr *pkt_hdr = (struct ether_hdr *)m->pkt.data;
-	uint16_t vlan_tag = (uint16_t)vlan_tags[(uint16_t)dev->device_fh];
-
-	/*Add packet to the port tx queue*/
-	tx_q = &tx_queue_zcp[(uint16_t)dev->vmdq_rx_q];
-	len = tx_q->len;
-
-	/* Allocate an mbuf and populate the structure. */
-	vpool = &vpool_array[MAX_QUEUES + (uint16_t)dev->vmdq_rx_q];
-	rte_ring_sc_dequeue(vpool->ring, (void **)&mbuf);
-	if (unlikely(mbuf == NULL)) {
-		struct vhost_virtqueue *vq = dev->virtqueue[VIRTIO_TXQ];
-		RTE_LOG(ERR, VHOST_DATA,
-			"(%"PRIu64") Failed to allocate memory for mbuf.\n",
-			dev->device_fh);
-		put_desc_to_used_list_zcp(vq, desc_idx);
-		return;
-	}
-
-	if (vm2vm_mode == VM2VM_HARDWARE) {
-		/* Avoid using a vlan tag from any vm for external pkt, such as
-		 * vlan_tags[dev->device_fh], oterwise, it conflicts when pool
-		 * selection, MAC address determines it as an external pkt
-		 * which should go to network, while vlan tag determine it as
-		 * a vm2vm pkt should forward to another vm. Hardware confuse
-		 * such a ambiguous situation, so pkt will lost.
-		 */
-		vlan_tag = external_pkt_default_vlan_tag;
-		while (dev_ll != NULL) {
-			if (likely(dev_ll->dev->ready == DEVICE_RX) &&
-				ether_addr_cmp(&(pkt_hdr->d_addr),
-				&dev_ll->dev->mac_address)) {
-
-				/*
-				 * Drop the packet if the TX packet is destined
-				 * for the TX device.
-				 */
-				if (unlikely(dev_ll->dev->device_fh
-					== dev->device_fh)) {
-					LOG_DEBUG(VHOST_DATA,
-					"(%"PRIu64") TX: Source and destination"
-					"MAC addresses are the same. Dropping "
-					"packet.\n",
-					dev_ll->dev->device_fh);
-					MBUF_HEADROOM_UINT32(mbuf)
-						= (uint32_t)desc_idx;
-					__rte_mbuf_raw_free(mbuf);
-					return;
-				}
-
-				/*
-				 * Packet length offset 4 bytes for HW vlan
-				 * strip when L2 switch back.
-				 */
-				offset = 4;
-				vlan_tag =
-				(uint16_t)
-				vlan_tags[(uint16_t)dev_ll->dev->device_fh];
-
-				LOG_DEBUG(VHOST_DATA,
-				"(%"PRIu64") TX: pkt to local VM device id:"
-				"(%"PRIu64") vlan tag: %d.\n",
-				dev->device_fh, dev_ll->dev->device_fh,
-				vlan_tag);
-
-				break;
-			}
-			dev_ll = dev_ll->next;
-		}
-	}
-
-	mbuf->pkt.nb_segs = m->pkt.nb_segs;
-	mbuf->pkt.next = m->pkt.next;
-	mbuf->pkt.data_len = m->pkt.data_len + offset;
-	mbuf->pkt.pkt_len = mbuf->pkt.data_len;
-	if (unlikely(need_copy)) {
-		/* Copy the packet contents to the mbuf. */
-		rte_memcpy((void *)((uint8_t *)mbuf->pkt.data),
-			(const void *) ((uint8_t *)m->pkt.data),
-			m->pkt.data_len);
-	} else {
-		mbuf->pkt.data = m->pkt.data;
-		mbuf->buf_physaddr = m->buf_physaddr;
-		mbuf->buf_addr = m->buf_addr;
-	}
-	mbuf->ol_flags = PKT_TX_VLAN_PKT;
-	mbuf->pkt.vlan_macip.f.vlan_tci = vlan_tag;
-	mbuf->pkt.vlan_macip.f.l2_len = sizeof(struct ether_hdr);
-	mbuf->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
-	MBUF_HEADROOM_UINT32(mbuf) = (uint32_t)desc_idx;
-
-	tx_q->m_table[len] = mbuf;
-	len++;
-
-	LOG_DEBUG(VHOST_DATA,
-		"(%"PRIu64") in tx_route_zcp: pkt: nb_seg: %d, next:%s\n",
-		dev->device_fh,
-		mbuf->pkt.nb_segs,
-		(mbuf->pkt.next == NULL) ? "null" : "non-null");
-
-	if (enable_stats) {
-		dev_statistics[dev->device_fh].tx_total++;
-		dev_statistics[dev->device_fh].tx++;
-	}
-
-	if (unlikely(len == MAX_PKT_BURST)) {
-		m_table = (struct rte_mbuf **)tx_q->m_table;
-		ret = rte_eth_tx_burst(ports[0],
-			(uint16_t)tx_q->txq_id, m_table, (uint16_t) len);
-
-		/*
-		 * Free any buffers not handled by TX and update
-		 * the port stats.
-		 */
-		if (unlikely(ret < len)) {
-			do {
-				rte_pktmbuf_free(m_table[ret]);
-			} while (++ret < len);
-		}
-
-		len = 0;
-		txmbuf_clean_zcp(dev, vpool);
-	}
-
-	tx_q->len = len;
-
-	return;
-}
-
-/*
- * This function TX all available packets in virtio TX queue for one
- * virtio-net device. If it is first packet, it learns MAC address and
- * setup VMDQ.
- */
-static inline void __attribute__((always_inline))
-virtio_dev_tx_zcp(struct virtio_net *dev)
-{
-	struct rte_mbuf m;
-	struct vhost_virtqueue *vq;
-	struct vring_desc *desc;
-	uint64_t buff_addr = 0, phys_addr;
-	uint32_t head[MAX_PKT_BURST];
-	uint32_t i;
-	uint16_t free_entries, packet_success = 0;
-	uint16_t avail_idx;
-	uint8_t need_copy = 0;
-	hpa_type addr_type;
-
-	vq = dev->virtqueue[VIRTIO_TXQ];
-	avail_idx =  *((volatile uint16_t *)&vq->avail->idx);
-
-	/* If there are no available buffers then return. */
-	if (vq->last_used_idx_res == avail_idx)
-		return;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_tx()\n", dev->device_fh);
-
-	/* Prefetch available ring to retrieve head indexes. */
-	rte_prefetch0(&vq->avail->ring[vq->last_used_idx_res & (vq->size - 1)]);
-
-	/* Get the number of free entries in the ring */
-	free_entries = (avail_idx - vq->last_used_idx_res);
-
-	/* Limit to MAX_PKT_BURST. */
-	free_entries
-		= (free_entries > MAX_PKT_BURST) ? MAX_PKT_BURST : free_entries;
-
-	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n",
-		dev->device_fh, free_entries);
-
-	/* Retrieve all of the head indexes first to avoid caching issues. */
-	for (i = 0; i < free_entries; i++)
-		head[i]
-			= vq->avail->ring[(vq->last_used_idx_res + i)
-			& (vq->size - 1)];
-
-	vq->last_used_idx_res += free_entries;
-
-	/* Prefetch descriptor index. */
-	rte_prefetch0(&vq->desc[head[packet_success]]);
-	rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
-
-	while (packet_success < free_entries) {
-		desc = &vq->desc[head[packet_success]];
-
-		/* Discard first buffer as it is the virtio header */
-		desc = &vq->desc[desc->next];
-
-		/* Buffer address translation. */
-		buff_addr = gpa_to_vva(dev, desc->addr);
-		phys_addr = gpa_to_hpa(dev, desc->addr, desc->len, &addr_type);
-
-		if (likely(packet_success < (free_entries - 1)))
-			/* Prefetch descriptor index. */
-			rte_prefetch0(&vq->desc[head[packet_success + 1]]);
-
-		if (unlikely(addr_type == PHYS_ADDR_INVALID)) {
-			RTE_LOG(ERR, VHOST_DATA,
-				"(%"PRIu64") Invalid frame buffer address found"
-				"when TX packets!\n",
-				dev->device_fh);
-			packet_success++;
-			continue;
-		}
-
-		/* Prefetch buffer address. */
-		rte_prefetch0((void *)(uintptr_t)buff_addr);
-
-		/*
-		 * Setup dummy mbuf. This is copied to a real mbuf if
-		 * transmitted out the physical port.
-		 */
-		m.pkt.data_len = desc->len;
-		m.pkt.nb_segs = 1;
-		m.pkt.next = NULL;
-		m.pkt.data = (void *)(uintptr_t)buff_addr;
-		m.buf_addr = m.pkt.data;
-		m.buf_physaddr = phys_addr;
-
-		/*
-		 * Check if the frame buffer address from guest crosses
-		 * sub-region or not.
-		 */
-		if (unlikely(addr_type == PHYS_ADDR_CROSS_SUBREG)) {
-			RTE_LOG(ERR, VHOST_DATA,
-				"(%"PRIu64") Frame buffer address cross "
-				"sub-regioin found when attaching TX frame "
-				"buffer address!\n",
-				dev->device_fh);
-			need_copy = 1;
-		} else
-			need_copy = 0;
-
-		PRINT_PACKET(dev, (uintptr_t)buff_addr, desc->len, 0);
-
-		/*
-		 * If this is the first received packet we need to learn
-		 * the MAC and setup VMDQ
-		 */
-		if (unlikely(dev->ready == DEVICE_MAC_LEARNING)) {
-			if (dev->remove || (link_vmdq(dev, &m) == -1)) {
-				/*
-				 * Discard frame if device is scheduled for
-				 * removal or a duplicate MAC address is found.
-				 */
-				packet_success += free_entries;
-				vq->last_used_idx += packet_success;
-				break;
-			}
-		}
-
-		virtio_tx_route_zcp(dev, &m, head[packet_success], need_copy);
-		packet_success++;
-	}
-}
-
-/*
- * This function is called by each data core. It handles all RX/TX registered
- * with the core. For TX the specific lcore linked list is used. For RX, MAC
- * addresses are compared with all devices in the main linked list.
- */
-static int
-switch_worker_zcp(__attribute__((unused)) void *arg)
-{
-	struct virtio_net *dev = NULL;
-	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
-	struct virtio_net_data_ll *dev_ll;
-	struct mbuf_table *tx_q;
-	volatile struct lcore_ll_info *lcore_ll;
-	const uint64_t drain_tsc
-		= (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S
-		* BURST_TX_DRAIN_US;
-	uint64_t prev_tsc, diff_tsc, cur_tsc, ret_count = 0;
-	unsigned ret;
-	const uint16_t lcore_id = rte_lcore_id();
-	uint16_t count_in_ring, rx_count = 0;
-
-	RTE_LOG(INFO, VHOST_DATA, "Procesing on Core %u started\n", lcore_id);
-
-	lcore_ll = lcore_info[lcore_id].lcore_ll;
-	prev_tsc = 0;
-
-	while (1) {
-		cur_tsc = rte_rdtsc();
-
-		/* TX burst queue drain */
-		diff_tsc = cur_tsc - prev_tsc;
-		if (unlikely(diff_tsc > drain_tsc)) {
-			/*
-			 * Get mbuf from vpool.pool and detach mbuf and
-			 * put back into vpool.ring.
-			 */
-			dev_ll = lcore_ll->ll_root_used;
-			while ((dev_ll != NULL) && (dev_ll->dev != NULL)) {
-				/* Get virtio device ID */
-				dev = dev_ll->dev;
-
-				if (likely(!dev->remove)) {
-					tx_q = &tx_queue_zcp[(uint16_t)dev->vmdq_rx_q];
-					if (tx_q->len) {
-						LOG_DEBUG(VHOST_DATA,
-						"TX queue drained after timeout"
-						" with burst size %u\n",
-						tx_q->len);
-
-						/*
-						 * Tx any packets in the queue
-						 */
-						ret = rte_eth_tx_burst(
-							ports[0],
-							(uint16_t)tx_q->txq_id,
-							(struct rte_mbuf **)
-							tx_q->m_table,
-							(uint16_t)tx_q->len);
-						if (unlikely(ret < tx_q->len)) {
-							do {
-								rte_pktmbuf_free(
-									tx_q->m_table[ret]);
-							} while (++ret < tx_q->len);
-						}
-						tx_q->len = 0;
-
-						txmbuf_clean_zcp(dev,
-							&vpool_array[MAX_QUEUES+dev->vmdq_rx_q]);
-					}
-				}
-				dev_ll = dev_ll->next;
-			}
-			prev_tsc = cur_tsc;
-		}
-
-		rte_prefetch0(lcore_ll->ll_root_used);
-
-		/*
-		 * Inform the configuration core that we have exited the linked
-		 * list and that no devices are in use if requested.
-		 */
-		if (lcore_ll->dev_removal_flag == REQUEST_DEV_REMOVAL)
-			lcore_ll->dev_removal_flag = ACK_DEV_REMOVAL;
-
-		/* Process devices */
-		dev_ll = lcore_ll->ll_root_used;
-
-		while ((dev_ll != NULL) && (dev_ll->dev != NULL)) {
-			dev = dev_ll->dev;
-			if (unlikely(dev->remove)) {
-				dev_ll = dev_ll->next;
-				unlink_vmdq(dev);
-				dev->ready = DEVICE_SAFE_REMOVE;
-				continue;
-			}
-
-			if (likely(dev->ready == DEVICE_RX)) {
-				uint32_t index = dev->vmdq_rx_q;
-				uint16_t i;
-				count_in_ring
-				= rte_ring_count(vpool_array[index].ring);
-				uint16_t free_entries
-				= (uint16_t)get_available_ring_num_zcp(dev);
-
-				/*
-				 * Attach all mbufs in vpool.ring and put back
-				 * into vpool.pool.
-				 */
-				for (i = 0;
-				i < RTE_MIN(free_entries,
-				RTE_MIN(count_in_ring, MAX_PKT_BURST));
-				i++)
-					attach_rxmbuf_zcp(dev);
-
-				/* Handle guest RX */
-				rx_count = rte_eth_rx_burst(ports[0],
-					(uint16_t)dev->vmdq_rx_q, pkts_burst,
-					MAX_PKT_BURST);
-
-				if (rx_count) {
-					ret_count = virtio_dev_rx_zcp(dev,
-							pkts_burst, rx_count);
-					if (enable_stats) {
-						dev_statistics[dev->device_fh].rx_total
-							+= rx_count;
-						dev_statistics[dev->device_fh].rx
-							+= ret_count;
-					}
-					while (likely(rx_count)) {
-						rx_count--;
-						pktmbuf_detach_zcp(
-							pkts_burst[rx_count]);
-						rte_ring_sp_enqueue(
-							vpool_array[index].ring,
-							(void *)pkts_burst[rx_count]);
-					}
-				}
-			}
-
-			if (likely(!dev->remove))
-				/* Handle guest TX */
-				virtio_dev_tx_zcp(dev);
-
-			/* Move to the next device in the list */
-			dev_ll = dev_ll->next;
-		}
-	}
-
-	return 0;
-}
-
-
-/*
- * Add an entry to a used linked list. A free entry must first be found
- * in the free linked list using get_data_ll_free_entry();
- */
-static void
-add_data_ll_entry(struct virtio_net_data_ll **ll_root_addr,
-	struct virtio_net_data_ll *ll_dev)
-{
-	struct virtio_net_data_ll *ll = *ll_root_addr;
-
-	/* Set next as NULL and use a compiler barrier to avoid reordering. */
-	ll_dev->next = NULL;
-	rte_compiler_barrier();
-
-	/* If ll == NULL then this is the first device. */
-	if (ll) {
-		/* Increment to the tail of the linked list. */
-		while ((ll->next != NULL) )
-			ll = ll->next;
-
-		ll->next = ll_dev;
-	} else {
-		*ll_root_addr = ll_dev;
-	}
-}
-
-/*
- * Remove an entry from a used linked list. The entry must then be added to
- * the free linked list using put_data_ll_free_entry().
- */
-static void
-rm_data_ll_entry(struct virtio_net_data_ll **ll_root_addr,
-	struct virtio_net_data_ll *ll_dev,
-	struct virtio_net_data_ll *ll_dev_last)
-{
-	struct virtio_net_data_ll *ll = *ll_root_addr;
-
-	if (unlikely((ll == NULL) || (ll_dev == NULL)))
-		return;
-
-	if (ll_dev == ll)
-		*ll_root_addr = ll_dev->next;
-	else
-		if (likely(ll_dev_last != NULL))
-			ll_dev_last->next = ll_dev->next;
-		else
-			RTE_LOG(ERR, VHOST_CONFIG, "Remove entry form ll failed.\n");
-}
-
-/*
- * Find and return an entry from the free linked list.
- */
-static struct virtio_net_data_ll *
-get_data_ll_free_entry(struct virtio_net_data_ll **ll_root_addr)
-{
-	struct virtio_net_data_ll *ll_free = *ll_root_addr;
-	struct virtio_net_data_ll *ll_dev;
-
-	if (ll_free == NULL)
-		return NULL;
-
-	ll_dev = ll_free;
-	*ll_root_addr = ll_free->next;
-
-	return ll_dev;
-}
-
-/*
- * Place an entry back on to the free linked list.
- */
-static void
-put_data_ll_free_entry(struct virtio_net_data_ll **ll_root_addr,
-	struct virtio_net_data_ll *ll_dev)
-{
-	struct virtio_net_data_ll *ll_free = *ll_root_addr;
-
-	if (ll_dev == NULL)
-		return;
-
-	ll_dev->next = ll_free;
-	*ll_root_addr = ll_dev;
-}
-
-/*
- * Creates a linked list of a given size.
- */
-static struct virtio_net_data_ll *
-alloc_data_ll(uint32_t size)
-{
-	struct virtio_net_data_ll *ll_new;
-	uint32_t i;
-
-	/* Malloc and then chain the linked list. */
-	ll_new = malloc(size * sizeof(struct virtio_net_data_ll));
-	if (ll_new == NULL) {
-		RTE_LOG(ERR, VHOST_CONFIG, "Failed to allocate memory for ll_new.\n");
-		return NULL;
-	}
-
-	for (i = 0; i < size - 1; i++) {
-		ll_new[i].dev = NULL;
-		ll_new[i].next = &ll_new[i+1];
-	}
-	ll_new[i].next = NULL;
-
-	return (ll_new);
-}
-
-/*
- * Create the main linked list along with each individual cores linked list. A used and a free list
- * are created to manage entries.
- */
-static int
-init_data_ll (void)
-{
-	int lcore;
-
-	RTE_LCORE_FOREACH_SLAVE(lcore) {
-		lcore_info[lcore].lcore_ll = malloc(sizeof(struct lcore_ll_info));
-		if (lcore_info[lcore].lcore_ll == NULL) {
-			RTE_LOG(ERR, VHOST_CONFIG, "Failed to allocate memory for lcore_ll.\n");
-			return -1;
-		}
-
-		lcore_info[lcore].lcore_ll->device_num = 0;
-		lcore_info[lcore].lcore_ll->dev_removal_flag = ACK_DEV_REMOVAL;
-		lcore_info[lcore].lcore_ll->ll_root_used = NULL;
-		if (num_devices % num_switching_cores)
-			lcore_info[lcore].lcore_ll->ll_root_free = alloc_data_ll((num_devices / num_switching_cores) + 1);
-		else
-			lcore_info[lcore].lcore_ll->ll_root_free = alloc_data_ll(num_devices / num_switching_cores);
-	}
-
-	/* Allocate devices up to a maximum of MAX_DEVICES. */
-	ll_root_free = alloc_data_ll(MIN((num_devices), MAX_DEVICES));
-
-	return 0;
-}
-
-/*
- * Set virtqueue flags so that we do not receive interrupts.
- */
-static void
-set_irq_status (struct virtio_net *dev)
-{
-	dev->virtqueue[VIRTIO_RXQ]->used->flags = VRING_USED_F_NO_NOTIFY;
-	dev->virtqueue[VIRTIO_TXQ]->used->flags = VRING_USED_F_NO_NOTIFY;
-}
-
-/*
- * Remove a device from the specific data core linked list and from the main linked list. Synchonization
- * occurs through the use of the lcore dev_removal_flag. Device is made volatile here to avoid re-ordering
- * of dev->remove=1 which can cause an infinite loop in the rte_pause loop.
- */
-static void
-destroy_device (volatile struct virtio_net *dev)
-{
-	struct virtio_net_data_ll *ll_lcore_dev_cur;
-	struct virtio_net_data_ll *ll_main_dev_cur;
-	struct virtio_net_data_ll *ll_lcore_dev_last = NULL;
-	struct virtio_net_data_ll *ll_main_dev_last = NULL;
-	int lcore;
-
-	dev->flags &= ~VIRTIO_DEV_RUNNING;
-
-	/*set the remove flag. */
-	dev->remove = 1;
-
-	while(dev->ready != DEVICE_SAFE_REMOVE) {
-		rte_pause();
-	}
-
-	/* Search for entry to be removed from lcore ll */
-	ll_lcore_dev_cur = lcore_info[dev->coreid].lcore_ll->ll_root_used;
-	while (ll_lcore_dev_cur != NULL) {
-		if (ll_lcore_dev_cur->dev == dev) {
-			break;
-		} else {
-			ll_lcore_dev_last = ll_lcore_dev_cur;
-			ll_lcore_dev_cur = ll_lcore_dev_cur->next;
-		}
-	}
-
-	if (ll_lcore_dev_cur == NULL) {
-		RTE_LOG(ERR, VHOST_CONFIG,
-			"(%"PRIu64") Failed to find the dev to be destroy.\n",
-			dev->device_fh);
-		return;
-	}
-
-	/* Search for entry to be removed from main ll */
-	ll_main_dev_cur = ll_root_used;
-	ll_main_dev_last = NULL;
-	while (ll_main_dev_cur != NULL) {
-		if (ll_main_dev_cur->dev == dev) {
-			break;
-		} else {
-			ll_main_dev_last = ll_main_dev_cur;
-			ll_main_dev_cur = ll_main_dev_cur->next;
-		}
-	}
-
-	/* Remove entries from the lcore and main ll. */
-	rm_data_ll_entry(&lcore_info[ll_lcore_dev_cur->dev->coreid].lcore_ll->ll_root_used, ll_lcore_dev_cur, ll_lcore_dev_last);
-	rm_data_ll_entry(&ll_root_used, ll_main_dev_cur, ll_main_dev_last);
-
-	/* Set the dev_removal_flag on each lcore. */
-	RTE_LCORE_FOREACH_SLAVE(lcore) {
-		lcore_info[lcore].lcore_ll->dev_removal_flag = REQUEST_DEV_REMOVAL;
-	}
-
-	/*
-	 * Once each core has set the dev_removal_flag to ACK_DEV_REMOVAL we can be sure that
-	 * they can no longer access the device removed from the linked lists and that the devices
-	 * are no longer in use.
-	 */
-	RTE_LCORE_FOREACH_SLAVE(lcore) {
-		while (lcore_info[lcore].lcore_ll->dev_removal_flag != ACK_DEV_REMOVAL) {
-			rte_pause();
-		}
-	}
-
-	/* Add the entries back to the lcore and main free ll.*/
-	put_data_ll_free_entry(&lcore_info[ll_lcore_dev_cur->dev->coreid].lcore_ll->ll_root_free, ll_lcore_dev_cur);
-	put_data_ll_free_entry(&ll_root_free, ll_main_dev_cur);
-
-	/* Decrement number of device on the lcore. */
-	lcore_info[ll_lcore_dev_cur->dev->coreid].lcore_ll->device_num--;
-
-	RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") Device has been removed from data core\n", dev->device_fh);
-
-	if (zero_copy) {
-		struct vpool *vpool = &vpool_array[dev->vmdq_rx_q];
-
-		/* Stop the RX queue. */
-		if (rte_eth_dev_rx_queue_stop(ports[0], dev->vmdq_rx_q) != 0) {
-			LOG_DEBUG(VHOST_CONFIG,
-				"(%"PRIu64") In destroy_device: Failed to stop "
-				"rx queue:%d\n",
-				dev->device_fh,
-				dev->vmdq_rx_q);
-		}
-
-		LOG_DEBUG(VHOST_CONFIG,
-			"(%"PRIu64") in destroy_device: Start put mbuf in "
-			"mempool back to ring for RX queue: %d\n",
-			dev->device_fh, dev->vmdq_rx_q);
-
-		mbuf_destroy_zcp(vpool);
-
-		/* Stop the TX queue. */
-		if (rte_eth_dev_tx_queue_stop(ports[0], dev->vmdq_rx_q) != 0) {
-			LOG_DEBUG(VHOST_CONFIG,
-				"(%"PRIu64") In destroy_device: Failed to "
-				"stop tx queue:%d\n",
-				dev->device_fh, dev->vmdq_rx_q);
-		}
-
-		vpool = &vpool_array[dev->vmdq_rx_q + MAX_QUEUES];
-
-		LOG_DEBUG(VHOST_CONFIG,
-			"(%"PRIu64") destroy_device: Start put mbuf in mempool "
-			"back to ring for TX queue: %d, dev:(%"PRIu64")\n",
-			dev->device_fh, (dev->vmdq_rx_q + MAX_QUEUES),
-			dev->device_fh);
-
-		mbuf_destroy_zcp(vpool);
-	}
-
-}
-
-/*
- * A new device is added to a data core. First the device is added to the main linked list
- * and the allocated to a specific data core.
- */
-static int
-new_device (struct virtio_net *dev)
-{
-	struct virtio_net_data_ll *ll_dev;
-	int lcore, core_add = 0;
-	uint32_t device_num_min = num_devices;
-
-	/* Add device to main ll */
-	ll_dev = get_data_ll_free_entry(&ll_root_free);
-	if (ll_dev == NULL) {
-		RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") No free entry found in linked list. Device limit "
-			"of %d devices per core has been reached\n",
-			dev->device_fh, num_devices);
-		return -1;
-	}
-	ll_dev->dev = dev;
-	add_data_ll_entry(&ll_root_used, ll_dev);
-	ll_dev->dev->vmdq_rx_q
-		= ll_dev->dev->device_fh * (num_queues / num_devices);
-
-	if (zero_copy) {
-		uint32_t index = ll_dev->dev->vmdq_rx_q;
-		uint32_t count_in_ring, i;
-		struct mbuf_table *tx_q;
-
-		count_in_ring = rte_ring_count(vpool_array[index].ring);
-
-		LOG_DEBUG(VHOST_CONFIG,
-			"(%"PRIu64") in new_device: mbuf count in mempool "
-			"before attach is: %d\n",
-			dev->device_fh,
-			rte_mempool_count(vpool_array[index].pool));
-		LOG_DEBUG(VHOST_CONFIG,
-			"(%"PRIu64") in new_device: mbuf count in  ring "
-			"before attach  is : %d\n",
-			dev->device_fh, count_in_ring);
-
-		/*
-		 * Attach all mbufs in vpool.ring and put back intovpool.pool.
-		 */
-		for (i = 0; i < count_in_ring; i++)
-			attach_rxmbuf_zcp(dev);
-
-		LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") in new_device: mbuf count in "
-			"mempool after attach is: %d\n",
-			dev->device_fh,
-			rte_mempool_count(vpool_array[index].pool));
-		LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") in new_device: mbuf count in "
-			"ring after attach  is : %d\n",
-			dev->device_fh,
-			rte_ring_count(vpool_array[index].ring));
-
-		tx_q = &tx_queue_zcp[(uint16_t)dev->vmdq_rx_q];
-		tx_q->txq_id = dev->vmdq_rx_q;
-
-		if (rte_eth_dev_tx_queue_start(ports[0], dev->vmdq_rx_q) != 0) {
-			struct vpool *vpool = &vpool_array[dev->vmdq_rx_q];
-
-			LOG_DEBUG(VHOST_CONFIG,
-				"(%"PRIu64") In new_device: Failed to start "
-				"tx queue:%d\n",
-				dev->device_fh, dev->vmdq_rx_q);
-
-			mbuf_destroy_zcp(vpool);
-			return -1;
-		}
-
-		if (rte_eth_dev_rx_queue_start(ports[0], dev->vmdq_rx_q) != 0) {
-			struct vpool *vpool = &vpool_array[dev->vmdq_rx_q];
-
-			LOG_DEBUG(VHOST_CONFIG,
-				"(%"PRIu64") In new_device: Failed to start "
-				"rx queue:%d\n",
-				dev->device_fh, dev->vmdq_rx_q);
-
-			/* Stop the TX queue. */
-			if (rte_eth_dev_tx_queue_stop(ports[0],
-				dev->vmdq_rx_q) != 0) {
-				LOG_DEBUG(VHOST_CONFIG,
-					"(%"PRIu64") In new_device: Failed to "
-					"stop tx queue:%d\n",
-					dev->device_fh, dev->vmdq_rx_q);
-			}
-
-			mbuf_destroy_zcp(vpool);
-			return -1;
-		}
-
-	}
-
-	/*reset ready flag*/
-	dev->ready = DEVICE_MAC_LEARNING;
-	dev->remove = 0;
-
-	/* Find a suitable lcore to add the device. */
-	RTE_LCORE_FOREACH_SLAVE(lcore) {
-		if (lcore_info[lcore].lcore_ll->device_num < device_num_min) {
-			device_num_min = lcore_info[lcore].lcore_ll->device_num;
-			core_add = lcore;
-		}
-	}
-	/* Add device to lcore ll */
-	ll_dev->dev->coreid = core_add;
-	ll_dev = get_data_ll_free_entry(&lcore_info[ll_dev->dev->coreid].lcore_ll->ll_root_free);
-	if (ll_dev == NULL) {
-		RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") Failed to add device to data core\n", dev->device_fh);
-		dev->ready = DEVICE_SAFE_REMOVE;
-		destroy_device(dev);
-		return -1;
-	}
-	ll_dev->dev = dev;
-	add_data_ll_entry(&lcore_info[ll_dev->dev->coreid].lcore_ll->ll_root_used, ll_dev);
-
-	/* Initialize device stats */
-	memset(&dev_statistics[dev->device_fh], 0, sizeof(struct device_statistics));
-
-	/* Disable notifications. */
-	set_irq_status(dev);
-	lcore_info[ll_dev->dev->coreid].lcore_ll->device_num++;
-	dev->flags |= VIRTIO_DEV_RUNNING;
-
-	RTE_LOG(INFO, VHOST_DATA, "(%"PRIu64") Device has been added to data core %d\n", dev->device_fh, dev->coreid);
-
-	return 0;
-}
-
-/*
- * These callback allow devices to be added to the data core when configuration
- * has been fully complete.
- */
-static const struct virtio_net_device_ops virtio_net_device_ops =
-{
-	.new_device =  new_device,
-	.destroy_device = destroy_device,
-};
-
-/*
- * This is a thread will wake up after a period to print stats if the user has
- * enabled them.
- */
-static void
-print_stats(void)
-{
-	struct virtio_net_data_ll *dev_ll;
-	uint64_t tx_dropped, rx_dropped;
-	uint64_t tx, tx_total, rx, rx_total;
-	uint32_t device_fh;
-	const char clr[] = { 27, '[', '2', 'J', '\0' };
-	const char top_left[] = { 27, '[', '1', ';', '1', 'H','\0' };
-
-	while(1) {
-		sleep(enable_stats);
-
-		/* Clear screen and move to top left */
-		printf("%s%s", clr, top_left);
-
-		printf("\nDevice statistics ====================================");
-
-		dev_ll = ll_root_used;
-		while (dev_ll != NULL) {
-			device_fh = (uint32_t)dev_ll->dev->device_fh;
-			tx_total = dev_statistics[device_fh].tx_total;
-			tx = dev_statistics[device_fh].tx;
-			tx_dropped = tx_total - tx;
-			if (zero_copy == 0) {
-				rx_total = rte_atomic64_read(
-					&dev_statistics[device_fh].rx_total_atomic);
-				rx = rte_atomic64_read(
-					&dev_statistics[device_fh].rx_atomic);
-			} else {
-				rx_total = dev_statistics[device_fh].rx_total;
-				rx = dev_statistics[device_fh].rx;
-			}
-			rx_dropped = rx_total - rx;
-
-			printf("\nStatistics for device %"PRIu32" ------------------------------"
-					"\nTX total: 		%"PRIu64""
-					"\nTX dropped: 		%"PRIu64""
-					"\nTX successful: 		%"PRIu64""
-					"\nRX total: 		%"PRIu64""
-					"\nRX dropped: 		%"PRIu64""
-					"\nRX successful: 		%"PRIu64"",
-					device_fh,
-					tx_total,
-					tx_dropped,
-					tx,
-					rx_total,
-					rx_dropped,
-					rx);
-
-			dev_ll = dev_ll->next;
-		}
-		printf("\n======================================================\n");
-	}
-}
-
-static void
-setup_mempool_tbl(int socket, uint32_t index, char *pool_name,
-	char *ring_name, uint32_t nb_mbuf)
-{
-	uint16_t roomsize = VIRTIO_DESCRIPTOR_LEN_ZCP + RTE_PKTMBUF_HEADROOM;
-	vpool_array[index].pool
-		= rte_mempool_create(pool_name, nb_mbuf, MBUF_SIZE_ZCP,
-		MBUF_CACHE_SIZE_ZCP, sizeof(struct rte_pktmbuf_pool_private),
-		rte_pktmbuf_pool_init, (void *)(uintptr_t)roomsize,
-		rte_pktmbuf_init, NULL, socket, 0);
-	if (vpool_array[index].pool != NULL) {
-		vpool_array[index].ring
-			= rte_ring_create(ring_name,
-				rte_align32pow2(nb_mbuf + 1),
-				socket, RING_F_SP_ENQ | RING_F_SC_DEQ);
-		if (likely(vpool_array[index].ring != NULL)) {
-			LOG_DEBUG(VHOST_CONFIG,
-				"in setup_mempool_tbl: mbuf count in "
-				"mempool is: %d\n",
-				rte_mempool_count(vpool_array[index].pool));
-			LOG_DEBUG(VHOST_CONFIG,
-				"in setup_mempool_tbl: mbuf count in "
-				"ring   is: %d\n",
-				rte_ring_count(vpool_array[index].ring));
-		} else {
-			rte_exit(EXIT_FAILURE, "ring_create(%s) failed",
-				ring_name);
-		}
-
-		/* Need consider head room. */
-		vpool_array[index].buf_size = roomsize - RTE_PKTMBUF_HEADROOM;
-	} else {
-		rte_exit(EXIT_FAILURE, "mempool_create(%s) failed", pool_name);
-	}
-}
-
-
-/*
- * Main function, does initialisation and calls the per-lcore functions. The CUSE
- * device is also registered here to handle the IOCTLs.
- */
-int
-MAIN(int argc, char *argv[])
-{
-	struct rte_mempool *mbuf_pool = NULL;
-	unsigned lcore_id, core_id = 0;
-	unsigned nb_ports, valid_num_ports;
-	int ret;
-	uint8_t portid, queue_id = 0;
-	static pthread_t tid;
-
-	/* init EAL */
-	ret = rte_eal_init(argc, argv);
-	if (ret < 0)
-		rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
-	argc -= ret;
-	argv += ret;
-
-	/* parse app arguments */
-	ret = us_vhost_parse_args(argc, argv);
-	if (ret < 0)
-		rte_exit(EXIT_FAILURE, "Invalid argument\n");
-
-	if (rte_eal_pci_probe() != 0)
-		rte_exit(EXIT_FAILURE, "Error with NIC driver initialization\n");
-
-	for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id ++)
-		if (rte_lcore_is_enabled(lcore_id))
-			lcore_ids[core_id ++] = lcore_id;
-
-	if (rte_lcore_count() > RTE_MAX_LCORE)
-		rte_exit(EXIT_FAILURE,"Not enough cores\n");
-
-	/*set the number of swithcing cores available*/
-	num_switching_cores = rte_lcore_count()-1;
-
-	/* Get the number of physical ports. */
-	nb_ports = rte_eth_dev_count();
-	if (nb_ports > RTE_MAX_ETHPORTS)
-		nb_ports = RTE_MAX_ETHPORTS;
-
-	/*
-	 * Update the global var NUM_PORTS and global array PORTS
-	 * and get value of var VALID_NUM_PORTS according to system ports number
-	 */
-	valid_num_ports = check_ports_num(nb_ports);
-
-	if ((valid_num_ports ==  0) || (valid_num_ports > MAX_SUP_PORTS)) {
-		RTE_LOG(INFO, VHOST_PORT, "Current enabled port number is %u,"
-			"but only %u port can be enabled\n",num_ports, MAX_SUP_PORTS);
-		return -1;
-	}
-
-	if (zero_copy == 0) {
-		/* Create the mbuf pool. */
-		mbuf_pool = rte_mempool_create(
-				"MBUF_POOL",
-				NUM_MBUFS_PER_PORT
-				* valid_num_ports,
-				MBUF_SIZE, MBUF_CACHE_SIZE,
-				sizeof(struct rte_pktmbuf_pool_private),
-				rte_pktmbuf_pool_init, NULL,
-				rte_pktmbuf_init, NULL,
-				rte_socket_id(), 0);
-		if (mbuf_pool == NULL)
-			rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
-
-		for (queue_id = 0; queue_id < MAX_QUEUES + 1; queue_id++)
-			vpool_array[queue_id].pool = mbuf_pool;
-
-		if (vm2vm_mode == VM2VM_HARDWARE) {
-			/* Enable VT loop back to let L2 switch to do it. */
-			vmdq_conf_default.rx_adv_conf.vmdq_rx_conf.enable_loop_back = 1;
-			LOG_DEBUG(VHOST_CONFIG,
-				"Enable loop back for L2 switch in vmdq.\n");
-		}
-	} else {
-		uint32_t nb_mbuf;
-		char pool_name[RTE_MEMPOOL_NAMESIZE];
-		char ring_name[RTE_MEMPOOL_NAMESIZE];
-
-		rx_conf_default.start_rx_per_q = (uint8_t)zero_copy;
-		rx_conf_default.rx_drop_en = 0;
-		tx_conf_default.start_tx_per_q = (uint8_t)zero_copy;
-		nb_mbuf = num_rx_descriptor
-			+ num_switching_cores * MBUF_CACHE_SIZE_ZCP
-			+ num_switching_cores * MAX_PKT_BURST;
-
-		for (queue_id = 0; queue_id < MAX_QUEUES; queue_id++) {
-			snprintf(pool_name, sizeof(pool_name),
-				"rxmbuf_pool_%u", queue_id);
-			snprintf(ring_name, sizeof(ring_name),
-				"rxmbuf_ring_%u", queue_id);
-			setup_mempool_tbl(rte_socket_id(), queue_id,
-				pool_name, ring_name, nb_mbuf);
-		}
-
-		nb_mbuf = num_tx_descriptor
-				+ num_switching_cores * MBUF_CACHE_SIZE_ZCP
-				+ num_switching_cores * MAX_PKT_BURST;
-
-		for (queue_id = 0; queue_id < MAX_QUEUES; queue_id++) {
-			snprintf(pool_name, sizeof(pool_name),
-				"txmbuf_pool_%u", queue_id);
-			snprintf(ring_name, sizeof(ring_name),
-				"txmbuf_ring_%u", queue_id);
-			setup_mempool_tbl(rte_socket_id(),
-				(queue_id + MAX_QUEUES),
-				pool_name, ring_name, nb_mbuf);
-		}
-
-		if (vm2vm_mode == VM2VM_HARDWARE) {
-			/* Enable VT loop back to let L2 switch to do it. */
-			vmdq_conf_default.rx_adv_conf.vmdq_rx_conf.enable_loop_back = 1;
-			LOG_DEBUG(VHOST_CONFIG,
-				"Enable loop back for L2 switch in vmdq.\n");
-		}
-	}
-	/* Set log level. */
-	rte_set_log_level(LOG_LEVEL);
-
-	/* initialize all ports */
-	for (portid = 0; portid < nb_ports; portid++) {
-		/* skip ports that are not enabled */
-		if ((enabled_port_mask & (1 << portid)) == 0) {
-			RTE_LOG(INFO, VHOST_PORT,
-				"Skipping disabled port %d\n", portid);
-			continue;
-		}
-		if (port_init(portid) != 0)
-			rte_exit(EXIT_FAILURE,
-				"Cannot initialize network ports\n");
-	}
-
-	/* Initialise all linked lists. */
-	if (init_data_ll() == -1)
-		rte_exit(EXIT_FAILURE, "Failed to initialize linked list\n");
-
-	/* Initialize device stats */
-	memset(&dev_statistics, 0, sizeof(dev_statistics));
-
-	/* Enable stats if the user option is set. */
-	if (enable_stats)
-		pthread_create(&tid, NULL, (void*)print_stats, NULL );
-
-	/* Launch all data cores. */
-	if (zero_copy == 0) {
-		RTE_LCORE_FOREACH_SLAVE(lcore_id) {
-			rte_eal_remote_launch(switch_worker,
-				mbuf_pool, lcore_id);
-		}
-	} else {
-		uint32_t count_in_mempool, index, i;
-		for (index = 0; index < 2*MAX_QUEUES; index++) {
-			/* For all RX and TX queues. */
-			count_in_mempool
-				= rte_mempool_count(vpool_array[index].pool);
-
-			/*
-			 * Transfer all un-attached mbufs from vpool.pool
-			 * to vpoo.ring.
-			 */
-			for (i = 0; i < count_in_mempool; i++) {
-				struct rte_mbuf *mbuf
-					= __rte_mbuf_raw_alloc(
-						vpool_array[index].pool);
-				rte_ring_sp_enqueue(vpool_array[index].ring,
-						(void *)mbuf);
-			}
-
-			LOG_DEBUG(VHOST_CONFIG,
-				"in MAIN: mbuf count in mempool at initial "
-				"is: %d\n", count_in_mempool);
-			LOG_DEBUG(VHOST_CONFIG,
-				"in MAIN: mbuf count in  ring at initial  is :"
-				" %d\n",
-				rte_ring_count(vpool_array[index].ring));
-		}
-
-		RTE_LCORE_FOREACH_SLAVE(lcore_id)
-			rte_eal_remote_launch(switch_worker_zcp, NULL,
-				lcore_id);
-	}
-
-	/* Register CUSE device to handle IOCTLs. */
-	ret = register_cuse_device((char*)&dev_basename, dev_index, get_virtio_net_callbacks());
-	if (ret != 0)
-		rte_exit(EXIT_FAILURE,"CUSE device setup failure.\n");
-
-	init_virtio_net(&virtio_net_device_ops);
-
-	/* Start CUSE session. */
-	start_cuse_session_loop();
-	return 0;
-
-}
-
diff --git a/lib/librte_vhost/main.h b/lib/librte_vhost/main.h
deleted file mode 100644
index c15d938..0000000
--- a/lib/librte_vhost/main.h
+++ /dev/null
@@ -1,86 +0,0 @@ 
-/*-
- *   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 _MAIN_H_
-#define _MAIN_H_
-
-#ifdef RTE_EXEC_ENV_BAREMETAL
-#define MAIN _main
-#else
-#define MAIN main
-#endif
-
-//#define DEBUG
-
-#ifdef DEBUG
-#define LOG_LEVEL RTE_LOG_DEBUG
-#define LOG_DEBUG(log_type, fmt, args...) do {	\
-	RTE_LOG(DEBUG, log_type, fmt, ##args);		\
-} while (0)
-#else
-#define LOG_LEVEL RTE_LOG_INFO
-#define LOG_DEBUG(log_type, fmt, args...) do{} while(0)
-#endif
-
-/* Macros for printing using RTE_LOG */
-#define RTE_LOGTYPE_VHOST_CONFIG RTE_LOGTYPE_USER1
-#define RTE_LOGTYPE_VHOST_DATA   RTE_LOGTYPE_USER2
-#define RTE_LOGTYPE_VHOST_PORT   RTE_LOGTYPE_USER3
-
-/*
- * Device linked list structure for data path.
- */
-struct virtio_net_data_ll
-{
-	struct virtio_net			*dev;	/* Pointer to device created by configuration core. */
-	struct virtio_net_data_ll	*next;  /* Pointer to next device in linked list. */
-};
-
-/*
- * Structure containing data core specific information.
- */
-struct lcore_ll_info
-{
-	struct virtio_net_data_ll	*ll_root_free; 		/* Pointer to head in free linked list. */
-	struct virtio_net_data_ll	*ll_root_used;		/* Pointer to head of used linked list. */
-	uint32_t 					device_num;			/* Number of devices on lcore. */
-	volatile uint8_t			dev_removal_flag;	/* Flag to synchronize device removal. */
-};
-
-struct lcore_info
-{
-	struct lcore_ll_info	*lcore_ll;	/* Pointer to data core specific lcore_ll_info struct */
-};
-
-int MAIN(int argc, char **argv);
-#endif /* _MAIN_H_ */
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
new file mode 100644
index 0000000..1a2f0dc
--- /dev/null
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -0,0 +1,161 @@ 
+/*-
+ *   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_NET_H_
+#define _VIRTIO_NET_H_
+
+/* Used to indicate that the device is running on a data core */
+#define VIRTIO_DEV_RUNNING 1
+
+/* Backend value set by guest. */
+#define VIRTIO_DEV_STOPPED -1
+
+#define PAGE_SIZE   4096
+
+/* Enum for virtqueue management. */
+enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
+
+#define BUF_VECTOR_MAX 256
+
+/*
+ * Structure contains buffer address, length and descriptor index
+ * from vring to do scatter RX.
+*/
+struct buf_vector {
+uint64_t buf_addr;
+uint32_t buf_len;
+uint32_t desc_idx;
+};
+
+/*
+ * Structure contains variables relevant to TX/RX virtqueues.
+ */
+struct vhost_virtqueue
+{
+	struct vring_desc	*desc;				/* Virtqueue descriptor ring. */
+	struct vring_avail	*avail;				/* Virtqueue available ring. */
+	struct vring_used	*used;				/* Virtqueue used ring. */
+	uint32_t			size;				/* Size of descriptor ring. */
+	uint32_t			backend;			/* Backend value to determine if device should started/stopped. */
+	uint16_t			vhost_hlen;			/* Vhost header length (varies depending on RX merge buffers. */
+	volatile uint16_t	last_used_idx;		/* Last index used on the available ring */
+	volatile uint16_t	last_used_idx_res;	/* Used for multiple devices reserving buffers. */
+	eventfd_t			callfd;				/* Currently unused as polling mode is enabled. */
+	eventfd_t			kickfd;				/* Used to notify the guest (trigger interrupt). */
+	/* Used for scatter RX. */
+	struct buf_vector	buf_vec[BUF_VECTOR_MAX];
+} __rte_cache_aligned;
+
+/*
+ * Device structure contains all configuration information relating to the device.
+ */
+struct virtio_net
+{
+	struct vhost_virtqueue	*virtqueue[VIRTIO_QNUM];	/* Contains all virtqueue information. */
+	struct virtio_memory 	*mem;						/* QEMU memory and memory region information. */
+	struct ether_addr 		mac_address;				/* Device MAC address (Obtained on first TX packet). */
+	uint64_t 				features;					/* Negotiated feature set. */
+	uint64_t 				device_fh;					/* device identifier. */
+	uint32_t 				vmdq_rx_q;					/* RX VMDQ queue number. */
+	uint32_t 				flags;						/* Device flags. Only used to check if device is running on data core. */
+	uint32_t 				vlan_tag;					/* Vlan tag for device. Currently set to device_id (0-63). */
+	uint16_t 				coreid;						/* Data core that the device is added to. */
+	volatile uint8_t 		ready;						/* A device is set as ready if the MAC address has been set. */
+	volatile uint8_t		remove;						/* Device is marked for removal from the data core. */
+} __rte_cache_aligned;
+
+/*
+ * Device linked list structure for configuration.
+ */
+struct virtio_net_config_ll
+{
+	struct virtio_net		dev;	/* Virtio device. */
+	struct virtio_net_config_ll	*next; /* Next entry on linked list. */
+};
+
+/*
+ * Information relating to memory regions including offsets to addresses in QEMUs memory file.
+ */
+struct virtio_memory_regions {
+	uint64_t	guest_phys_address;		/* Base guest physical address of region. */
+	uint64_t	guest_phys_address_end;	/* End guest physical address of region. */
+	uint64_t	memory_size;			/* Size of region. */
+	uint64_t	userspace_address;		/* Base userspace address of region. */
+	uint64_t	address_offset;			/* Offset of region for address translation. */
+};
+
+/*
+ * Information relating to memory regions including offsets to
+ * addresses in host physical space.
+ */
+struct virtio_memory_regions_hpa {
+	/* Base guest physical address of region. */
+	uint64_t	guest_phys_address;
+	/* End guest physical address of region. */
+	uint64_t	guest_phys_address_end;
+	/* Size of region. */
+	uint64_t	memory_size;
+	/* Offset of region for gpa to hpa translation. */
+	uint64_t	host_phys_addr_offset;
+};
+
+/*
+ * Memory structure includes region and mapping information.
+ */
+struct virtio_memory {
+	uint64_t			base_address;			/* Base QEMU userspace address of the memory file. */
+	uint64_t			mapped_address;			/* Mapped address of memory file base in our applications memory space. */
+	uint64_t			mapped_size;			/* Total size of memory file. */
+	uint32_t			nregions;				/* Number of memory regions. */
+	 /* Number of memory regions for gpa to hpa translation. */
+	uint32_t			nregions_hpa;
+	/* Memory region information for gpa to hpa translation. */
+	struct virtio_memory_regions_hpa  *regions_hpa;
+	/* Memory region information. */
+	struct virtio_memory_regions      regions[0];
+};
+
+/*
+ * Device operations to add/remove device.
+ */
+struct virtio_net_device_ops {
+	int (* new_device) 		(struct virtio_net *);	/* Add device. */
+	void (* destroy_device)	(volatile struct virtio_net *);	/* Remove device. */
+};
+
+int init_virtio_net(struct virtio_net_device_ops const * const);
+int deinit_virtio_net(void);
+
+struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
+
+#endif /* _VIRTIO_NET_H_ */
diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
new file mode 100644
index 0000000..78fce0d
--- /dev/null
+++ b/lib/librte_vhost/vhost_rxtx.c
@@ -0,0 +1,281 @@ 
+/*-
+ *   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 <linux/virtio_net.h>
+
+#include <rte_mbuf.h>
+#include <rte_memcpy.h>
+#include <rte_virtio_net.h>
+
+#include "vhost-net-cdev.h"
+
+#define MAX_PKT_BURST 64
+#define MAX_MRG_PKT_BURST 64
+
+/*
+ * This function adds buffers to the virtio devices RX virtqueue. Buffers can
+ * be received from the physical port or from another virtio device. A packet
+ * count is returned to indicate the number of packets that were succesfully
+ * added to the RX queue. This function works when mergeable is disabled.
+ */
+static inline uint32_t __attribute__((always_inline))
+virtio_dev_rx(struct virtio_net *dev, struct rte_mbuf **pkts, uint32_t count)
+{
+	struct vhost_virtqueue *vq;
+	struct vring_desc *desc;
+	struct rte_mbuf *buff;
+	/* The virtio_hdr is initialised to 0. */
+	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0,0,0,0,0,0},0};
+	uint64_t buff_addr = 0;
+	uint64_t buff_hdr_addr = 0;
+	uint32_t head[MAX_PKT_BURST], packet_len = 0;
+	uint32_t head_idx, packet_success = 0;
+	uint32_t retry = 0;
+	uint16_t avail_idx, res_cur_idx;
+	uint16_t res_base_idx, res_end_idx;
+	uint16_t free_entries;
+	uint8_t success = 0;
+
+	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
+	vq = dev->virtqueue[VIRTIO_RXQ];
+	count = (count > MAX_PKT_BURST) ? MAX_PKT_BURST : count;
+
+	/* As many data cores may want access to available buffers, they need to be reserved. */
+	do {
+		res_base_idx = vq->last_used_idx_res;
+		avail_idx = *((volatile uint16_t *)&vq->avail->idx);
+
+		free_entries = (avail_idx - res_base_idx);
+		/* If retry is enabled and the queue is full then we wait and retry to avoid packet loss. */
+		if (enable_retry && unlikely(count > free_entries)) {
+			for (retry = 0; retry < burst_rx_retry_num; retry++) {
+				rte_delay_us(burst_rx_delay_time);
+				avail_idx =
+					*((volatile uint16_t *)&vq->avail->idx);
+				free_entries = (avail_idx - res_base_idx);
+				if (count <= free_entries)
+					break;
+			}
+		}
+
+		/*check that we have enough buffers*/
+		if (unlikely(count > free_entries))
+			count = free_entries;
+
+		if (count == 0)
+			return 0;
+
+		res_end_idx = res_base_idx + count;
+		/* vq->last_used_idx_res is atomically updated. */
+		success = rte_atomic16_cmpset(&vq->last_used_idx_res, res_base_idx,
+									res_end_idx);
+	} while (unlikely(success == 0));
+	res_cur_idx = res_base_idx;
+	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Current Index %d| End Index %d\n", dev->device_fh, res_cur_idx, res_end_idx);
+
+	/* Prefetch available ring to retrieve indexes. */
+	rte_prefetch0(&vq->avail->ring[res_cur_idx & (vq->size - 1)]);
+
+	/* Retrieve all of the head indexes first to avoid caching issues. */
+	for (head_idx = 0; head_idx < count; head_idx++)
+		head[head_idx] = vq->avail->ring[(res_cur_idx + head_idx) & (vq->size - 1)];
+
+	/*Prefetch descriptor index. */
+	rte_prefetch0(&vq->desc[head[packet_success]]);
+
+	while (res_cur_idx != res_end_idx) {
+		/* Get descriptor from available ring */
+		desc = &vq->desc[head[packet_success]];
+
+		buff = pkts[packet_success];
+
+		/* Convert from gpa to vva (guest physical addr -> vhost virtual addr) */
+		buff_addr = gpa_to_vva(dev, desc->addr);
+		/* Prefetch buffer address. */
+		rte_prefetch0((void*)(uintptr_t)buff_addr);
+
+		/* Copy virtio_hdr to packet and increment buffer address */
+		buff_hdr_addr = buff_addr;
+		packet_len = rte_pktmbuf_data_len(buff) + vq->vhost_hlen;
+
+		/*
+		 * If the descriptors are chained the header and data are
+		 * placed in separate buffers.
+		 */
+		if (desc->flags & VRING_DESC_F_NEXT) {
+			desc->len = vq->vhost_hlen;
+			desc = &vq->desc[desc->next];
+			/* Buffer address translation. */
+			buff_addr = gpa_to_vva(dev, desc->addr);
+			desc->len = rte_pktmbuf_data_len(buff);
+		} else {
+			buff_addr += vq->vhost_hlen;
+			desc->len = packet_len;
+		}
+
+		/* Update used ring with desc information */
+		vq->used->ring[res_cur_idx & (vq->size - 1)].id = head[packet_success];
+		vq->used->ring[res_cur_idx & (vq->size - 1)].len = packet_len;
+
+		/* Copy mbuf data to buffer */
+		rte_memcpy((void *)(uintptr_t)buff_addr,
+			(const void *)buff->pkt.data,
+			rte_pktmbuf_data_len(buff));
+		PRINT_PACKET(dev, (uintptr_t)buff_addr,
+			rte_pktmbuf_data_len(buff), 0);
+
+		res_cur_idx++;
+		packet_success++;
+
+		rte_memcpy((void *)(uintptr_t)buff_hdr_addr,
+			(const void *)&virtio_hdr, vq->vhost_hlen);
+
+		PRINT_PACKET(dev, (uintptr_t)buff_hdr_addr, vq->vhost_hlen, 1);
+
+		if (res_cur_idx < res_end_idx) {
+			/* Prefetch descriptor index. */
+			rte_prefetch0(&vq->desc[head[packet_success]]);
+		}
+	}
+
+	rte_compiler_barrier();
+
+	/* Wait until it's our turn to add our buffer to the used ring. */
+	while (unlikely(vq->last_used_idx != res_base_idx))
+		rte_pause();
+
+	*(volatile uint16_t *)&vq->used->idx += count;
+	vq->last_used_idx = res_end_idx;
+
+	/* Kick the guest if necessary. */
+	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
+		eventfd_write((int)vq->kickfd, 1);
+	return count;
+}
+
+
+static inline void __attribute__((always_inline))
+virtio_dev_tx(struct virtio_net* dev, struct rte_mempool *mbuf_pool)
+{
+	struct rte_mbuf m;
+	struct vhost_virtqueue *vq;
+	struct vring_desc *desc;
+	uint64_t buff_addr = 0;
+	uint32_t head[MAX_PKT_BURST];
+	uint32_t used_idx;
+	uint32_t i;
+	uint16_t free_entries, packet_success = 0;
+	uint16_t avail_idx;
+
+	vq = dev->virtqueue[VIRTIO_TXQ];
+	avail_idx =  *((volatile uint16_t *)&vq->avail->idx);
+
+	/* If there are no available buffers then return. */
+	if (vq->last_used_idx == avail_idx)
+		return;
+
+	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_tx()\n", dev->device_fh);
+
+	/* Prefetch available ring to retrieve head indexes. */
+	rte_prefetch0(&vq->avail->ring[vq->last_used_idx & (vq->size - 1)]);
+
+	/*get the number of free entries in the ring*/
+	free_entries = (avail_idx - vq->last_used_idx);
+
+	/* Limit to MAX_PKT_BURST. */
+	if (free_entries > MAX_PKT_BURST)
+		free_entries = MAX_PKT_BURST;
+
+	LOG_DEBUG(VHOST_DATA, "(%"PRIu64") Buffers available %d\n", dev->device_fh, free_entries);
+	/* Retrieve all of the head indexes first to avoid caching issues. */
+	for (i = 0; i < free_entries; i++)
+		head[i] = vq->avail->ring[(vq->last_used_idx + i) & (vq->size - 1)];
+
+	/* Prefetch descriptor index. */
+	rte_prefetch0(&vq->desc[head[packet_success]]);
+	rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
+
+	while (packet_success < free_entries) {
+		desc = &vq->desc[head[packet_success]];
+
+		/* Discard first buffer as it is the virtio header */
+		desc = &vq->desc[desc->next];
+
+		/* Buffer address translation. */
+		buff_addr = gpa_to_vva(dev, desc->addr);
+		/* Prefetch buffer address. */
+		rte_prefetch0((void*)(uintptr_t)buff_addr);
+
+		used_idx = vq->last_used_idx & (vq->size - 1);
+
+		if (packet_success < (free_entries - 1)) {
+			/* Prefetch descriptor index. */
+			rte_prefetch0(&vq->desc[head[packet_success+1]]);
+			rte_prefetch0(&vq->used->ring[(used_idx + 1) & (vq->size - 1)]);
+		}
+
+		/* Update used index buffer information. */
+		vq->used->ring[used_idx].id = head[packet_success];
+		vq->used->ring[used_idx].len = 0;
+
+		/* Setup dummy mbuf. This is copied to a real mbuf if transmitted out the physical port. */
+		m.pkt.data_len = desc->len;
+		m.pkt.pkt_len = desc->len;
+		m.pkt.data = (void*)(uintptr_t)buff_addr;
+
+		PRINT_PACKET(dev, (uintptr_t)buff_addr, desc->len, 0);
+
+		/* If this is the first received packet we need to learn the MAC and setup VMDQ */
+		if (dev->ready == DEVICE_MAC_LEARNING) {
+			if (dev->remove || (link_vmdq(dev, &m) == -1)) {
+				/*discard frame if device is scheduled for removal or a duplicate MAC address is found. */
+				packet_success += free_entries;
+				vq->last_used_idx += packet_success;
+				break;
+			}
+		}
+		virtio_tx_route(dev, &m, mbuf_pool, (uint16_t)dev->device_fh);
+
+		vq->last_used_idx++;
+		packet_success++;
+	}
+
+	rte_compiler_barrier();
+	vq->used->idx += packet_success;
+	/* Kick guest if required. */
+	if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
+		eventfd_write((int)vq->kickfd, 1);
+}
+
+
diff --git a/lib/librte_vhost/virtio-net.h b/lib/librte_vhost/virtio-net.h
deleted file mode 100644
index 1a2f0dc..0000000
--- a/lib/librte_vhost/virtio-net.h
+++ /dev/null
@@ -1,161 +0,0 @@ 
-/*-
- *   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_NET_H_
-#define _VIRTIO_NET_H_
-
-/* Used to indicate that the device is running on a data core */
-#define VIRTIO_DEV_RUNNING 1
-
-/* Backend value set by guest. */
-#define VIRTIO_DEV_STOPPED -1
-
-#define PAGE_SIZE   4096
-
-/* Enum for virtqueue management. */
-enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
-
-#define BUF_VECTOR_MAX 256
-
-/*
- * Structure contains buffer address, length and descriptor index
- * from vring to do scatter RX.
-*/
-struct buf_vector {
-uint64_t buf_addr;
-uint32_t buf_len;
-uint32_t desc_idx;
-};
-
-/*
- * Structure contains variables relevant to TX/RX virtqueues.
- */
-struct vhost_virtqueue
-{
-	struct vring_desc	*desc;				/* Virtqueue descriptor ring. */
-	struct vring_avail	*avail;				/* Virtqueue available ring. */
-	struct vring_used	*used;				/* Virtqueue used ring. */
-	uint32_t			size;				/* Size of descriptor ring. */
-	uint32_t			backend;			/* Backend value to determine if device should started/stopped. */
-	uint16_t			vhost_hlen;			/* Vhost header length (varies depending on RX merge buffers. */
-	volatile uint16_t	last_used_idx;		/* Last index used on the available ring */
-	volatile uint16_t	last_used_idx_res;	/* Used for multiple devices reserving buffers. */
-	eventfd_t			callfd;				/* Currently unused as polling mode is enabled. */
-	eventfd_t			kickfd;				/* Used to notify the guest (trigger interrupt). */
-	/* Used for scatter RX. */
-	struct buf_vector	buf_vec[BUF_VECTOR_MAX];
-} __rte_cache_aligned;
-
-/*
- * Device structure contains all configuration information relating to the device.
- */
-struct virtio_net
-{
-	struct vhost_virtqueue	*virtqueue[VIRTIO_QNUM];	/* Contains all virtqueue information. */
-	struct virtio_memory 	*mem;						/* QEMU memory and memory region information. */
-	struct ether_addr 		mac_address;				/* Device MAC address (Obtained on first TX packet). */
-	uint64_t 				features;					/* Negotiated feature set. */
-	uint64_t 				device_fh;					/* device identifier. */
-	uint32_t 				vmdq_rx_q;					/* RX VMDQ queue number. */
-	uint32_t 				flags;						/* Device flags. Only used to check if device is running on data core. */
-	uint32_t 				vlan_tag;					/* Vlan tag for device. Currently set to device_id (0-63). */
-	uint16_t 				coreid;						/* Data core that the device is added to. */
-	volatile uint8_t 		ready;						/* A device is set as ready if the MAC address has been set. */
-	volatile uint8_t		remove;						/* Device is marked for removal from the data core. */
-} __rte_cache_aligned;
-
-/*
- * Device linked list structure for configuration.
- */
-struct virtio_net_config_ll
-{
-	struct virtio_net		dev;	/* Virtio device. */
-	struct virtio_net_config_ll	*next; /* Next entry on linked list. */
-};
-
-/*
- * Information relating to memory regions including offsets to addresses in QEMUs memory file.
- */
-struct virtio_memory_regions {
-	uint64_t	guest_phys_address;		/* Base guest physical address of region. */
-	uint64_t	guest_phys_address_end;	/* End guest physical address of region. */
-	uint64_t	memory_size;			/* Size of region. */
-	uint64_t	userspace_address;		/* Base userspace address of region. */
-	uint64_t	address_offset;			/* Offset of region for address translation. */
-};
-
-/*
- * Information relating to memory regions including offsets to
- * addresses in host physical space.
- */
-struct virtio_memory_regions_hpa {
-	/* Base guest physical address of region. */
-	uint64_t	guest_phys_address;
-	/* End guest physical address of region. */
-	uint64_t	guest_phys_address_end;
-	/* Size of region. */
-	uint64_t	memory_size;
-	/* Offset of region for gpa to hpa translation. */
-	uint64_t	host_phys_addr_offset;
-};
-
-/*
- * Memory structure includes region and mapping information.
- */
-struct virtio_memory {
-	uint64_t			base_address;			/* Base QEMU userspace address of the memory file. */
-	uint64_t			mapped_address;			/* Mapped address of memory file base in our applications memory space. */
-	uint64_t			mapped_size;			/* Total size of memory file. */
-	uint32_t			nregions;				/* Number of memory regions. */
-	 /* Number of memory regions for gpa to hpa translation. */
-	uint32_t			nregions_hpa;
-	/* Memory region information for gpa to hpa translation. */
-	struct virtio_memory_regions_hpa  *regions_hpa;
-	/* Memory region information. */
-	struct virtio_memory_regions      regions[0];
-};
-
-/*
- * Device operations to add/remove device.
- */
-struct virtio_net_device_ops {
-	int (* new_device) 		(struct virtio_net *);	/* Add device. */
-	void (* destroy_device)	(volatile struct virtio_net *);	/* Remove device. */
-};
-
-int init_virtio_net(struct virtio_net_device_ops const * const);
-int deinit_virtio_net(void);
-
-struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
-
-#endif /* _VIRTIO_NET_H_ */