X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=drivers%2Fnet%2Fvirtio%2Fvirtio_rxtx.c;h=eb891433e6b10d86c42cbdad221b1800f51fa388;hb=7f6ee6aee717e4ee5ca1d3f06af5a14f897b2168;hp=0fa635a624a0578725e83d70be0a17fae287b6a7;hpb=86d59b21468a3c7be30969c1ac5fd7212484b562;p=dpdk.git

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 0fa635a624..eb891433e6 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -1,34 +1,5 @@
-/*-
- *   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.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
  */
 
 #include <stdint.h>
@@ -39,18 +10,16 @@
 
 #include <rte_cycles.h>
 #include <rte_memory.h>
-#include <rte_memzone.h>
 #include <rte_branch_prediction.h>
 #include <rte_mempool.h>
 #include <rte_malloc.h>
 #include <rte_mbuf.h>
 #include <rte_ether.h>
-#include <rte_ethdev.h>
+#include <rte_ethdev_driver.h>
 #include <rte_prefetch.h>
 #include <rte_string_fns.h>
 #include <rte_errno.h>
 #include <rte_byteorder.h>
-#include <rte_cpuflags.h>
 #include <rte_net.h>
 #include <rte_ip.h>
 #include <rte_udp.h>
@@ -61,6 +30,7 @@
 #include "virtio_pci.h"
 #include "virtqueue.h"
 #include "virtio_rxtx.h"
+#include "virtio_rxtx_simple.h"
 
 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
@@ -68,11 +38,23 @@
 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
 #endif
 
+int
+virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
+{
+	struct virtnet_rx *rxvq = rxq;
+	struct virtqueue *vq = rxvq->vq;
 
-#define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
-	ETH_TXQ_FLAGS_NOOFFLOADS)
+	return VIRTQUEUE_NUSED(vq) >= offset;
+}
 
-static void
+void
+vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
+{
+	vq->vq_free_cnt += num;
+	vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
+}
+
+void
 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
 {
 	struct vring_desc *dp, *dp_tail;
@@ -124,7 +106,7 @@ virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 		cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 
 		if (unlikely(cookie == NULL)) {
-			PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
+			PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 				vq->vq_used_cons_idx);
 			break;
 		}
@@ -140,6 +122,44 @@ virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 	return i;
 }
 
+static uint16_t
+virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
+			struct rte_mbuf **rx_pkts,
+			uint32_t *len,
+			uint16_t num)
+{
+	struct vring_used_elem *uep;
+	struct rte_mbuf *cookie;
+	uint16_t used_idx = 0;
+	uint16_t i;
+
+	if (unlikely(num == 0))
+		return 0;
+
+	for (i = 0; i < num; i++) {
+		used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
+		/* Desc idx same as used idx */
+		uep = &vq->vq_ring.used->ring[used_idx];
+		len[i] = uep->len;
+		cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
+
+		if (unlikely(cookie == NULL)) {
+			PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
+				vq->vq_used_cons_idx);
+			break;
+		}
+
+		rte_prefetch0(cookie);
+		rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+		rx_pkts[i]  = cookie;
+		vq->vq_used_cons_idx++;
+		vq->vq_descx[used_idx].cookie = NULL;
+	}
+
+	vq_ring_free_inorder(vq, used_idx, i);
+	return i;
+}
+
 #ifndef DEFAULT_TX_FREE_THRESH
 #define DEFAULT_TX_FREE_THRESH 32
 #endif
@@ -168,6 +188,83 @@ virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
 	}
 }
 
+/* Cleanup from completed inorder transmits. */
+static void
+virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
+{
+	uint16_t i, used_idx, desc_idx = 0, last_idx;
+	int16_t free_cnt = 0;
+	struct vq_desc_extra *dxp = NULL;
+
+	if (unlikely(num == 0))
+		return;
+
+	for (i = 0; i < num; i++) {
+		struct vring_used_elem *uep;
+
+		used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
+		uep = &vq->vq_ring.used->ring[used_idx];
+		desc_idx = (uint16_t)uep->id;
+
+		dxp = &vq->vq_descx[desc_idx];
+		vq->vq_used_cons_idx++;
+
+		if (dxp->cookie != NULL) {
+			rte_pktmbuf_free(dxp->cookie);
+			dxp->cookie = NULL;
+		}
+	}
+
+	last_idx = desc_idx + dxp->ndescs - 1;
+	free_cnt = last_idx - vq->vq_desc_tail_idx;
+	if (free_cnt <= 0)
+		free_cnt += vq->vq_nentries;
+
+	vq_ring_free_inorder(vq, last_idx, free_cnt);
+}
+
+static inline int
+virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
+			struct rte_mbuf **cookies,
+			uint16_t num)
+{
+	struct vq_desc_extra *dxp;
+	struct virtio_hw *hw = vq->hw;
+	struct vring_desc *start_dp;
+	uint16_t head_idx, idx, i = 0;
+
+	if (unlikely(vq->vq_free_cnt == 0))
+		return -ENOSPC;
+	if (unlikely(vq->vq_free_cnt < num))
+		return -EMSGSIZE;
+
+	head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
+	start_dp = vq->vq_ring.desc;
+
+	while (i < num) {
+		idx = head_idx & (vq->vq_nentries - 1);
+		dxp = &vq->vq_descx[idx];
+		dxp->cookie = (void *)cookies[i];
+		dxp->ndescs = 1;
+
+		start_dp[idx].addr =
+				VIRTIO_MBUF_ADDR(cookies[i], vq) +
+				RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
+		start_dp[idx].len =
+				cookies[i]->buf_len -
+				RTE_PKTMBUF_HEADROOM +
+				hw->vtnet_hdr_size;
+		start_dp[idx].flags =  VRING_DESC_F_WRITE;
+
+		vq_update_avail_ring(vq, idx);
+		head_idx++;
+		i++;
+	}
+
+	vq->vq_desc_head_idx += num;
+	vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
+	return 0;
+}
 
 static inline int
 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
@@ -209,15 +306,160 @@ virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
 	return 0;
 }
 
-static inline int
-tx_offload_enabled(struct virtio_hw *hw)
+/* When doing TSO, the IP length is not included in the pseudo header
+ * checksum of the packet given to the PMD, but for virtio it is
+ * expected.
+ */
+static void
+virtio_tso_fix_cksum(struct rte_mbuf *m)
+{
+	/* common case: header is not fragmented */
+	if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
+			m->l4_len)) {
+		struct ipv4_hdr *iph;
+		struct ipv6_hdr *ip6h;
+		struct tcp_hdr *th;
+		uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
+		uint32_t tmp;
+
+		iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
+		th = RTE_PTR_ADD(iph, m->l3_len);
+		if ((iph->version_ihl >> 4) == 4) {
+			iph->hdr_checksum = 0;
+			iph->hdr_checksum = rte_ipv4_cksum(iph);
+			ip_len = iph->total_length;
+			ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
+				m->l3_len);
+		} else {
+			ip6h = (struct ipv6_hdr *)iph;
+			ip_paylen = ip6h->payload_len;
+		}
+
+		/* calculate the new phdr checksum not including ip_paylen */
+		prev_cksum = th->cksum;
+		tmp = prev_cksum;
+		tmp += ip_paylen;
+		tmp = (tmp & 0xffff) + (tmp >> 16);
+		new_cksum = tmp;
+
+		/* replace it in the packet */
+		th->cksum = new_cksum;
+	}
+}
+
+
+/* avoid write operation when necessary, to lessen cache issues */
+#define ASSIGN_UNLESS_EQUAL(var, val) do {	\
+	if ((var) != (val))			\
+		(var) = (val);			\
+} while (0)
+
+static inline void
+virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
+			struct rte_mbuf *cookie,
+			bool offload)
+{
+	if (offload) {
+		if (cookie->ol_flags & PKT_TX_TCP_SEG)
+			cookie->ol_flags |= PKT_TX_TCP_CKSUM;
+
+		switch (cookie->ol_flags & PKT_TX_L4_MASK) {
+		case PKT_TX_UDP_CKSUM:
+			hdr->csum_start = cookie->l2_len + cookie->l3_len;
+			hdr->csum_offset = offsetof(struct udp_hdr,
+				dgram_cksum);
+			hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+			break;
+
+		case PKT_TX_TCP_CKSUM:
+			hdr->csum_start = cookie->l2_len + cookie->l3_len;
+			hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
+			hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+			break;
+
+		default:
+			ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
+			break;
+		}
+
+		/* TCP Segmentation Offload */
+		if (cookie->ol_flags & PKT_TX_TCP_SEG) {
+			virtio_tso_fix_cksum(cookie);
+			hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
+				VIRTIO_NET_HDR_GSO_TCPV6 :
+				VIRTIO_NET_HDR_GSO_TCPV4;
+			hdr->gso_size = cookie->tso_segsz;
+			hdr->hdr_len =
+				cookie->l2_len +
+				cookie->l3_len +
+				cookie->l4_len;
+		} else {
+			ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
+		}
+	}
+}
+
+static inline void
+virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
+			struct rte_mbuf **cookies,
+			uint16_t num)
 {
-	return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM);
+	struct vq_desc_extra *dxp;
+	struct virtqueue *vq = txvq->vq;
+	struct vring_desc *start_dp;
+	struct virtio_net_hdr *hdr;
+	uint16_t idx;
+	uint16_t head_size = vq->hw->vtnet_hdr_size;
+	uint16_t i = 0;
+
+	idx = vq->vq_desc_head_idx;
+	start_dp = vq->vq_ring.desc;
+
+	while (i < num) {
+		idx = idx & (vq->vq_nentries - 1);
+		dxp = &vq->vq_descx[idx];
+		dxp->cookie = (void *)cookies[i];
+		dxp->ndescs = 1;
+
+		hdr = (struct virtio_net_hdr *)
+			rte_pktmbuf_prepend(cookies[i], head_size);
+		cookies[i]->pkt_len -= head_size;
+
+		/* if offload disabled, it is not zeroed below, do it now */
+		if (!vq->hw->has_tx_offload) {
+			ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
+		}
+
+		virtqueue_xmit_offload(hdr, cookies[i],
+				vq->hw->has_tx_offload);
+
+		start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
+		start_dp[idx].len   = cookies[i]->data_len;
+		start_dp[idx].flags = 0;
+
+		vq_update_avail_ring(vq, idx);
+
+		idx++;
+		i++;
+	};
+
+	vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
+	vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 }
 
 static inline void
 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
-		       uint16_t needed, int use_indirect, int can_push)
+			uint16_t needed, int use_indirect, int can_push,
+			int in_order)
 {
 	struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 	struct vq_desc_extra *dxp;
@@ -227,9 +469,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 	uint16_t head_idx, idx;
 	uint16_t head_size = vq->hw->vtnet_hdr_size;
 	struct virtio_net_hdr *hdr;
-	int offload;
 
-	offload = tx_offload_enabled(vq->hw);
 	head_idx = vq->vq_desc_head_idx;
 	idx = head_idx;
 	dxp = &vq->vq_descx[idx];
@@ -242,9 +482,20 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 		/* prepend cannot fail, checked by caller */
 		hdr = (struct virtio_net_hdr *)
 			rte_pktmbuf_prepend(cookie, head_size);
+		/* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
+		 * which is wrong. Below subtract restores correct pkt size.
+		 */
+		cookie->pkt_len -= head_size;
+
 		/* if offload disabled, it is not zeroed below, do it now */
-		if (offload == 0)
-			memset(hdr, 0, head_size);
+		if (!vq->hw->has_tx_offload) {
+			ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
+			ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
+		}
 	} else if (use_indirect) {
 		/* setup tx ring slot to point to indirect
 		 * descriptor list stored in reserved region.
@@ -274,33 +525,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 		idx = start_dp[idx].next;
 	}
 
-	if (offload) {
-		/* Checksum Offload */
-		switch (cookie->ol_flags & PKT_TX_L4_MASK) {
-		case PKT_TX_UDP_CKSUM:
-			hdr->csum_start = cookie->l2_len + cookie->l3_len;
-			hdr->csum_offset = offsetof(struct udp_hdr,
-				dgram_cksum);
-			hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
-			break;
-
-		case PKT_TX_TCP_CKSUM:
-			hdr->csum_start = cookie->l2_len + cookie->l3_len;
-			hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
-			hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
-			break;
-
-		default:
-			hdr->csum_start = 0;
-			hdr->csum_offset = 0;
-			hdr->flags = 0;
-			break;
-		}
-
-		hdr->gso_type = 0;
-		hdr->gso_size = 0;
-		hdr->hdr_len = 0;
-	}
+	virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 
 	do {
 		start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
@@ -312,40 +537,15 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 	if (use_indirect)
 		idx = vq->vq_ring.desc[head_idx].next;
 
-	vq->vq_desc_head_idx = idx;
-	if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
-		vq->vq_desc_tail_idx = idx;
 	vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
-	vq_update_avail_ring(vq, head_idx);
-}
-
-static void
-virtio_dev_vring_start(struct virtqueue *vq)
-{
-	int size = vq->vq_nentries;
-	struct vring *vr = &vq->vq_ring;
-	uint8_t *ring_mem = vq->vq_ring_virt_mem;
-
-	PMD_INIT_FUNC_TRACE();
 
-	/*
-	 * Reinitialise since virtio port might have been stopped and restarted
-	 */
-	memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
-	vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
-	vq->vq_used_cons_idx = 0;
-	vq->vq_desc_head_idx = 0;
-	vq->vq_avail_idx = 0;
-	vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
-	vq->vq_free_cnt = vq->vq_nentries;
-	memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
-
-	vring_desc_init(vr->desc, size);
+	vq->vq_desc_head_idx = idx;
+	vq_update_avail_ring(vq, head_idx);
 
-	/*
-	 * Disable device(host) interrupting guest
-	 */
-	virtqueue_disable_intr(vq);
+	if (!in_order) {
+		if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
+			vq->vq_desc_tail_idx = idx;
+	}
 }
 
 void
@@ -354,73 +554,109 @@ virtio_dev_cq_start(struct rte_eth_dev *dev)
 	struct virtio_hw *hw = dev->data->dev_private;
 
 	if (hw->cvq && hw->cvq->vq) {
-		virtio_dev_vring_start(hw->cvq->vq);
+		rte_spinlock_init(&hw->cvq->lock);
 		VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 	}
 }
 
-void
-virtio_dev_rxtx_start(struct rte_eth_dev *dev)
+int
+virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
+			uint16_t queue_idx,
+			uint16_t nb_desc,
+			unsigned int socket_id __rte_unused,
+			const struct rte_eth_rxconf *rx_conf __rte_unused,
+			struct rte_mempool *mp)
 {
-	/*
-	 * Start receive and transmit vrings
-	 * -	Setup vring structure for all queues
-	 * -	Initialize descriptor for the rx vring
-	 * -	Allocate blank mbufs for the each rx descriptor
-	 *
-	 */
-	uint16_t i;
-	uint16_t desc_idx;
+	uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
+	struct virtnet_rx *rxvq;
 
 	PMD_INIT_FUNC_TRACE();
 
-	/* Start rx vring. */
-	for (i = 0; i < dev->data->nb_rx_queues; i++) {
-		struct virtnet_rx *rxvq = dev->data->rx_queues[i];
-		struct virtqueue *vq = rxvq->vq;
-		int error, nbufs;
-		struct rte_mbuf *m;
-
-		virtio_dev_vring_start(vq);
-		if (rxvq->mpool == NULL) {
-			rte_exit(EXIT_FAILURE,
-				"Cannot allocate mbufs for rx virtqueue");
-		}
+	if (nb_desc == 0 || nb_desc > vq->vq_nentries)
+		nb_desc = vq->vq_nentries;
+	vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 
-		/* Allocate blank mbufs for the each rx descriptor */
-		nbufs = 0;
-		error = ENOSPC;
+	rxvq = &vq->rxq;
+	rxvq->queue_id = queue_idx;
+	rxvq->mpool = mp;
+	if (rxvq->mpool == NULL) {
+		rte_exit(EXIT_FAILURE,
+			"Cannot allocate mbufs for rx virtqueue");
+	}
 
-		if (hw->use_simple_rxtx) {
-			for (desc_idx = 0; desc_idx < vq->vq_nentries;
-			     desc_idx++) {
-				vq->vq_ring.avail->ring[desc_idx] = desc_idx;
-				vq->vq_ring.desc[desc_idx].flags =
-					VRING_DESC_F_WRITE;
-			}
-		}
+	dev->data->rx_queues[queue_idx] = rxvq;
+
+	return 0;
+}
 
-		memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
-		for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
+int
+virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
+{
+	uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
+	struct virtnet_rx *rxvq = &vq->rxq;
+	struct rte_mbuf *m;
+	uint16_t desc_idx;
+	int error, nbufs, i;
+
+	PMD_INIT_FUNC_TRACE();
+
+	/* Allocate blank mbufs for the each rx descriptor */
+	nbufs = 0;
+
+	if (hw->use_simple_rx) {
+		for (desc_idx = 0; desc_idx < vq->vq_nentries;
 		     desc_idx++) {
-			vq->sw_ring[vq->vq_nentries + desc_idx] =
-				&rxvq->fake_mbuf;
+			vq->vq_ring.avail->ring[desc_idx] = desc_idx;
+			vq->vq_ring.desc[desc_idx].flags =
+				VRING_DESC_F_WRITE;
 		}
 
+		virtio_rxq_vec_setup(rxvq);
+	}
+
+	memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
+	for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
+	     desc_idx++) {
+		vq->sw_ring[vq->vq_nentries + desc_idx] =
+			&rxvq->fake_mbuf;
+	}
+
+	if (hw->use_simple_rx) {
+		while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
+			virtio_rxq_rearm_vec(rxvq);
+			nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+		}
+	} else if (hw->use_inorder_rx) {
+		if ((!virtqueue_full(vq))) {
+			uint16_t free_cnt = vq->vq_free_cnt;
+			struct rte_mbuf *pkts[free_cnt];
+
+			if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
+				free_cnt)) {
+				error = virtqueue_enqueue_refill_inorder(vq,
+						pkts,
+						free_cnt);
+				if (unlikely(error)) {
+					for (i = 0; i < free_cnt; i++)
+						rte_pktmbuf_free(pkts[i]);
+				}
+			}
+
+			nbufs += free_cnt;
+			vq_update_avail_idx(vq);
+		}
+	} else {
 		while (!virtqueue_full(vq)) {
 			m = rte_mbuf_raw_alloc(rxvq->mpool);
 			if (m == NULL)
 				break;
 
-			/******************************************
-			*         Enqueue allocated buffers        *
-			*******************************************/
-			if (hw->use_simple_rxtx)
-				error = virtqueue_enqueue_recv_refill_simple(vq, m);
-			else
-				error = virtqueue_enqueue_recv_refill(vq, m);
-
+			/* Enqueue allocated buffers */
+			error = virtqueue_enqueue_recv_refill(vq, m);
 			if (error) {
 				rte_pktmbuf_free(m);
 				break;
@@ -429,120 +665,15 @@ virtio_dev_rxtx_start(struct rte_eth_dev *dev)
 		}
 
 		vq_update_avail_idx(vq);
-
-		PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
-
-		VIRTQUEUE_DUMP(vq);
 	}
 
-	/* Start tx vring. */
-	for (i = 0; i < dev->data->nb_tx_queues; i++) {
-		struct virtnet_tx *txvq = dev->data->tx_queues[i];
-		struct virtqueue *vq = txvq->vq;
-
-		virtio_dev_vring_start(vq);
-		if (hw->use_simple_rxtx) {
-			uint16_t mid_idx  = vq->vq_nentries >> 1;
-
-			for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
-				vq->vq_ring.avail->ring[desc_idx] =
-					desc_idx + mid_idx;
-				vq->vq_ring.desc[desc_idx + mid_idx].next =
-					desc_idx;
-				vq->vq_ring.desc[desc_idx + mid_idx].addr =
-					txvq->virtio_net_hdr_mem +
-					offsetof(struct virtio_tx_region, tx_hdr);
-				vq->vq_ring.desc[desc_idx + mid_idx].len =
-					vq->hw->vtnet_hdr_size;
-				vq->vq_ring.desc[desc_idx + mid_idx].flags =
-					VRING_DESC_F_NEXT;
-				vq->vq_ring.desc[desc_idx].flags = 0;
-			}
-			for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
-			     desc_idx++)
-				vq->vq_ring.avail->ring[desc_idx] = desc_idx;
-		}
-
-		VIRTQUEUE_DUMP(vq);
-	}
-}
+	PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 
-int
-virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
-			uint16_t queue_idx,
-			uint16_t nb_desc,
-			unsigned int socket_id,
-			__rte_unused const struct rte_eth_rxconf *rx_conf,
-			struct rte_mempool *mp)
-{
-	uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
-	struct virtnet_rx *rxvq;
-	int ret;
-
-	PMD_INIT_FUNC_TRACE();
-	ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
-			nb_desc, socket_id, (void **)&rxvq);
-	if (ret < 0) {
-		PMD_INIT_LOG(ERR, "rvq initialization failed");
-		return ret;
-	}
-
-	/* Create mempool for rx mbuf allocation */
-	rxvq->mpool = mp;
-
-	dev->data->rx_queues[queue_idx] = rxvq;
-
-	virtio_rxq_vec_setup(rxvq);
+	VIRTQUEUE_DUMP(vq);
 
 	return 0;
 }
 
-void
-virtio_dev_rx_queue_release(void *rxq)
-{
-	struct virtnet_rx *rxvq = rxq;
-	struct virtqueue *vq;
-	const struct rte_memzone *mz;
-
-	if (rxvq == NULL)
-		return;
-
-	/*
-	 * rxvq is freed when vq is freed, and as mz should be freed after the
-	 * del_queue, so we reserve the mz pointer first.
-	 */
-	vq = rxvq->vq;
-	mz = rxvq->mz;
-
-	virtio_dev_queue_release(vq);
-	rte_memzone_free(mz);
-}
-
-static void
-virtio_update_rxtx_handler(struct rte_eth_dev *dev,
-			   const struct rte_eth_txconf *tx_conf)
-{
-	uint8_t use_simple_rxtx = 0;
-	struct virtio_hw *hw = dev->data->dev_private;
-
-#if defined RTE_ARCH_X86
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3))
-		use_simple_rxtx = 1;
-#elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
-	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
-		use_simple_rxtx = 1;
-#endif
-	/* Use simple rx/tx func if single segment and no offloads */
-	if (use_simple_rxtx &&
-	    (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
-	    !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
-		PMD_INIT_LOG(INFO, "Using simple rx/tx path");
-		dev->tx_pkt_burst = virtio_xmit_pkts_simple;
-		dev->rx_pkt_burst = virtio_recv_pkts_vec;
-		hw->use_simple_rxtx = use_simple_rxtx;
-	}
-}
-
 /*
  * struct rte_eth_dev *dev: Used to update dev
  * uint16_t nb_desc: Defaults to values read from config space
@@ -554,27 +685,23 @@ int
 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 			uint16_t queue_idx,
 			uint16_t nb_desc,
-			unsigned int socket_id,
+			unsigned int socket_id __rte_unused,
 			const struct rte_eth_txconf *tx_conf)
 {
 	uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 	struct virtnet_tx *txvq;
-	struct virtqueue *vq;
 	uint16_t tx_free_thresh;
-	int ret;
 
 	PMD_INIT_FUNC_TRACE();
 
+	if (nb_desc == 0 || nb_desc > vq->vq_nentries)
+		nb_desc = vq->vq_nentries;
+	vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 
-	virtio_update_rxtx_handler(dev, tx_conf);
-
-	ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
-			nb_desc, socket_id, (void **)&txvq);
-	if (ret < 0) {
-		PMD_INIT_LOG(ERR, "tvq initialization failed");
-		return ret;
-	}
-	vq = txvq->vq;
+	txvq = &vq->txq;
+	txvq->queue_id = queue_idx;
 
 	tx_free_thresh = tx_conf->tx_free_thresh;
 	if (tx_free_thresh == 0)
@@ -596,28 +723,22 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 	return 0;
 }
 
-void
-virtio_dev_tx_queue_release(void *txq)
+int
+virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
+				uint16_t queue_idx)
 {
-	struct virtnet_tx *txvq = txq;
-	struct virtqueue *vq;
-	const struct rte_memzone *mz;
-	const struct rte_memzone *hdr_mz;
+	uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
+	struct virtio_hw *hw = dev->data->dev_private;
+	struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 
-	if (txvq == NULL)
-		return;
+	PMD_INIT_FUNC_TRACE();
 
-	/*
-	 * txvq is freed when vq is freed, and as mz should be freed after the
-	 * del_queue, so we reserve the mz pointer first.
-	 */
-	vq = txvq->vq;
-	mz = txvq->mz;
-	hdr_mz = txvq->virtio_net_hdr_mz;
+	if (hw->use_inorder_tx)
+		vq->vq_ring.desc[vq->vq_nentries - 1].next = 0;
+
+	VIRTQUEUE_DUMP(vq);
 
-	virtio_dev_queue_release(vq);
-	rte_memzone_free(mz);
-	rte_memzone_free(hdr_mz);
+	return 0;
 }
 
 static void
@@ -629,6 +750,19 @@ virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 	 * successful since it was just dequeued.
 	 */
 	error = virtqueue_enqueue_recv_refill(vq, m);
+
+	if (unlikely(error)) {
+		RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
+		rte_pktmbuf_free(m);
+	}
+}
+
+static void
+virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
+{
+	int error;
+
+	error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
 	if (unlikely(error)) {
 		RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 		rte_pktmbuf_free(m);
@@ -667,6 +801,15 @@ virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 	}
 }
 
+static inline void
+virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
+{
+	VIRTIO_DUMP_PACKET(m, m->data_len);
+
+	rxvq->stats.bytes += m->pkt_len;
+	virtio_update_packet_stats(&rxvq->stats, m);
+}
+
 /* Optionally fill offload information in structure */
 static int
 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
@@ -699,7 +842,7 @@ virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 			 * In case of SCTP, this will be wrong since it's a CRC
 			 * but there's nothing we can do.
 			 */
-			uint16_t csum, off;
+			uint16_t csum = 0, off;
 
 			rte_raw_cksum_mbuf(m, hdr->csum_start,
 				rte_pktmbuf_pkt_len(m) - hdr->csum_start,
@@ -739,14 +882,6 @@ virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 	return 0;
 }
 
-static inline int
-rx_offload_enabled(struct virtio_hw *hw)
-{
-	return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
-		vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
-		vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
-}
-
 #define VIRTIO_MBUF_BURST_SZ 64
 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 uint16_t
@@ -754,7 +889,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 {
 	struct virtnet_rx *rxvq = rx_queue;
 	struct virtqueue *vq = rxvq->vq;
-	struct virtio_hw *hw;
+	struct virtio_hw *hw = vq->hw;
 	struct rte_mbuf *rxm, *new_mbuf;
 	uint16_t nb_used, num, nb_rx;
 	uint32_t len[VIRTIO_MBUF_BURST_SZ];
@@ -762,26 +897,27 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 	int error;
 	uint32_t i, nb_enqueued;
 	uint32_t hdr_size;
-	int offload;
 	struct virtio_net_hdr *hdr;
 
+	nb_rx = 0;
+	if (unlikely(hw->started == 0))
+		return nb_rx;
+
 	nb_used = VIRTQUEUE_NUSED(vq);
 
 	virtio_rmb();
 
-	num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
-	num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
+	num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
+	if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
+		num = VIRTIO_MBUF_BURST_SZ;
 	if (likely(num > DESC_PER_CACHELINE))
 		num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 
 	num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 	PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 
-	hw = vq->hw;
-	nb_rx = 0;
 	nb_enqueued = 0;
 	hdr_size = hw->vtnet_hdr_size;
-	offload = rx_offload_enabled(hw);
 
 	for (i = 0; i < num ; i++) {
 		rxm = rcv_pkts[i];
@@ -801,8 +937,6 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 		rxm->ol_flags = 0;
 		rxm->vlan_tci = 0;
 
-		rxm->nb_segs = 1;
-		rxm->next = NULL;
 		rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 		rxm->data_len = (uint16_t)(len[i] - hdr_size);
 
@@ -812,24 +946,20 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 		if (hw->vlan_strip)
 			rte_vlan_strip(rxm);
 
-		if (offload && virtio_rx_offload(rxm, hdr) < 0) {
+		if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
 			virtio_discard_rxbuf(vq, rxm);
 			rxvq->stats.errors++;
 			continue;
 		}
 
-		VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
+		virtio_rx_stats_updated(rxvq, rxm);
 
 		rx_pkts[nb_rx++] = rxm;
-
-		rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
-		virtio_update_packet_stats(&rxvq->stats, rxm);
 	}
 
 	rxvq->stats.packets += nb_rx;
 
 	/* Allocate new mbuf for the used descriptor */
-	error = ENOSPC;
 	while (likely(!virtqueue_full(vq))) {
 		new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 		if (unlikely(new_mbuf == NULL)) {
@@ -858,6 +988,193 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 	return nb_rx;
 }
 
+uint16_t
+virtio_recv_mergeable_pkts_inorder(void *rx_queue,
+			struct rte_mbuf **rx_pkts,
+			uint16_t nb_pkts)
+{
+	struct virtnet_rx *rxvq = rx_queue;
+	struct virtqueue *vq = rxvq->vq;
+	struct virtio_hw *hw = vq->hw;
+	struct rte_mbuf *rxm;
+	struct rte_mbuf *prev;
+	uint16_t nb_used, num, nb_rx;
+	uint32_t len[VIRTIO_MBUF_BURST_SZ];
+	struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+	int error;
+	uint32_t nb_enqueued;
+	uint32_t seg_num;
+	uint32_t seg_res;
+	uint32_t hdr_size;
+	int32_t i;
+
+	nb_rx = 0;
+	if (unlikely(hw->started == 0))
+		return nb_rx;
+
+	nb_used = VIRTQUEUE_NUSED(vq);
+	nb_used = RTE_MIN(nb_used, nb_pkts);
+	nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
+
+	virtio_rmb();
+
+	PMD_RX_LOG(DEBUG, "used:%d", nb_used);
+
+	nb_enqueued = 0;
+	seg_num = 1;
+	seg_res = 0;
+	hdr_size = hw->vtnet_hdr_size;
+
+	num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
+
+	for (i = 0; i < num; i++) {
+		struct virtio_net_hdr_mrg_rxbuf *header;
+
+		PMD_RX_LOG(DEBUG, "dequeue:%d", num);
+		PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
+
+		rxm = rcv_pkts[i];
+
+		if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
+			PMD_RX_LOG(ERR, "Packet drop");
+			nb_enqueued++;
+			virtio_discard_rxbuf_inorder(vq, rxm);
+			rxvq->stats.errors++;
+			continue;
+		}
+
+		header = (struct virtio_net_hdr_mrg_rxbuf *)
+			 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
+			 - hdr_size);
+		seg_num = header->num_buffers;
+
+		if (seg_num == 0)
+			seg_num = 1;
+
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+		rxm->nb_segs = seg_num;
+		rxm->ol_flags = 0;
+		rxm->vlan_tci = 0;
+		rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
+		rxm->data_len = (uint16_t)(len[i] - hdr_size);
+
+		rxm->port = rxvq->port_id;
+
+		rx_pkts[nb_rx] = rxm;
+		prev = rxm;
+
+		if (vq->hw->has_rx_offload &&
+				virtio_rx_offload(rxm, &header->hdr) < 0) {
+			virtio_discard_rxbuf_inorder(vq, rxm);
+			rxvq->stats.errors++;
+			continue;
+		}
+
+		if (hw->vlan_strip)
+			rte_vlan_strip(rx_pkts[nb_rx]);
+
+		seg_res = seg_num - 1;
+
+		/* Merge remaining segments */
+		while (seg_res != 0 && i < (num - 1)) {
+			i++;
+
+			rxm = rcv_pkts[i];
+			rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
+			rxm->pkt_len = (uint32_t)(len[i]);
+			rxm->data_len = (uint16_t)(len[i]);
+
+			rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
+			rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
+
+			if (prev)
+				prev->next = rxm;
+
+			prev = rxm;
+			seg_res -= 1;
+		}
+
+		if (!seg_res) {
+			virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
+			nb_rx++;
+		}
+	}
+
+	/* Last packet still need merge segments */
+	while (seg_res != 0) {
+		uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
+					VIRTIO_MBUF_BURST_SZ);
+
+		prev = rcv_pkts[nb_rx];
+		if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
+			num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
+							   rcv_cnt);
+			uint16_t extra_idx = 0;
+
+			rcv_cnt = num;
+			while (extra_idx < rcv_cnt) {
+				rxm = rcv_pkts[extra_idx];
+				rxm->data_off =
+					RTE_PKTMBUF_HEADROOM - hdr_size;
+				rxm->pkt_len = (uint32_t)(len[extra_idx]);
+				rxm->data_len = (uint16_t)(len[extra_idx]);
+				prev->next = rxm;
+				prev = rxm;
+				rx_pkts[nb_rx]->pkt_len += len[extra_idx];
+				rx_pkts[nb_rx]->data_len += len[extra_idx];
+				extra_idx += 1;
+			};
+			seg_res -= rcv_cnt;
+
+			if (!seg_res) {
+				virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
+				nb_rx++;
+			}
+		} else {
+			PMD_RX_LOG(ERR,
+					"No enough segments for packet.");
+			virtio_discard_rxbuf_inorder(vq, prev);
+			rxvq->stats.errors++;
+			break;
+		}
+	}
+
+	rxvq->stats.packets += nb_rx;
+
+	/* Allocate new mbuf for the used descriptor */
+
+	if (likely(!virtqueue_full(vq))) {
+		/* free_cnt may include mrg descs */
+		uint16_t free_cnt = vq->vq_free_cnt;
+		struct rte_mbuf *new_pkts[free_cnt];
+
+		if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
+			error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
+					free_cnt);
+			if (unlikely(error)) {
+				for (i = 0; i < free_cnt; i++)
+					rte_pktmbuf_free(new_pkts[i]);
+			}
+			nb_enqueued += free_cnt;
+		} else {
+			struct rte_eth_dev *dev =
+				&rte_eth_devices[rxvq->port_id];
+			dev->data->rx_mbuf_alloc_failed += free_cnt;
+		}
+	}
+
+	if (likely(nb_enqueued)) {
+		vq_update_avail_idx(vq);
+
+		if (unlikely(virtqueue_kick_prepare(vq))) {
+			virtqueue_notify(vq);
+			PMD_RX_LOG(DEBUG, "Notified");
+		}
+	}
+
+	return nb_rx;
+}
+
 uint16_t
 virtio_recv_mergeable_pkts(void *rx_queue,
 			struct rte_mbuf **rx_pkts,
@@ -865,7 +1182,7 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 {
 	struct virtnet_rx *rxvq = rx_queue;
 	struct virtqueue *vq = rxvq->vq;
-	struct virtio_hw *hw;
+	struct virtio_hw *hw = vq->hw;
 	struct rte_mbuf *rxm, *new_mbuf;
 	uint16_t nb_used, num, nb_rx;
 	uint32_t len[VIRTIO_MBUF_BURST_SZ];
@@ -877,7 +1194,10 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 	uint16_t extra_idx;
 	uint32_t seg_res;
 	uint32_t hdr_size;
-	int offload;
+
+	nb_rx = 0;
+	if (unlikely(hw->started == 0))
+		return nb_rx;
 
 	nb_used = VIRTQUEUE_NUSED(vq);
 
@@ -885,15 +1205,12 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 
 	PMD_RX_LOG(DEBUG, "used:%d", nb_used);
 
-	hw = vq->hw;
-	nb_rx = 0;
 	i = 0;
 	nb_enqueued = 0;
 	seg_num = 0;
 	extra_idx = 0;
 	seg_res = 0;
 	hdr_size = hw->vtnet_hdr_size;
-	offload = rx_offload_enabled(hw);
 
 	while (i < nb_used) {
 		struct virtio_net_hdr_mrg_rxbuf *header;
@@ -929,7 +1246,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 
 		rxm->data_off = RTE_PKTMBUF_HEADROOM;
 		rxm->nb_segs = seg_num;
-		rxm->next = NULL;
 		rxm->ol_flags = 0;
 		rxm->vlan_tci = 0;
 		rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
@@ -939,7 +1255,8 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 		rx_pkts[nb_rx] = rxm;
 		prev = rxm;
 
-		if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
+		if (hw->has_rx_offload &&
+				virtio_rx_offload(rxm, &header->hdr) < 0) {
 			virtio_discard_rxbuf(vq, rxm);
 			rxvq->stats.errors++;
 			continue;
@@ -974,7 +1291,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 				rxm = rcv_pkts[extra_idx];
 
 				rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
-				rxm->next = NULL;
 				rxm->pkt_len = (uint32_t)(len[extra_idx]);
 				rxm->data_len = (uint16_t)(len[extra_idx]);
 
@@ -1002,7 +1318,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 	rxvq->stats.packets += nb_rx;
 
 	/* Allocate new mbuf for the used descriptor */
-	error = ENOSPC;
 	while (likely(!virtqueue_full(vq))) {
 		new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 		if (unlikely(new_mbuf == NULL)) {
@@ -1038,9 +1353,12 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 	struct virtqueue *vq = txvq->vq;
 	struct virtio_hw *hw = vq->hw;
 	uint16_t hdr_size = hw->vtnet_hdr_size;
-	uint16_t nb_used, nb_tx;
+	uint16_t nb_used, nb_tx = 0;
 	int error;
 
+	if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
+		return nb_tx;
+
 	if (unlikely(nb_pkts < 1))
 		return nb_pkts;
 
@@ -1065,7 +1383,8 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		}
 
 		/* optimize ring usage */
-		if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
+		if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
+		      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
 		    rte_mbuf_refcnt_read(txm) == 1 &&
 		    RTE_MBUF_DIRECT(txm) &&
 		    txm->nb_segs == 1 &&
@@ -1101,12 +1420,124 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		}
 
 		/* Enqueue Packet buffers */
-		virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
+		virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
+			can_push, 0);
+
+		txvq->stats.bytes += txm->pkt_len;
+		virtio_update_packet_stats(&txvq->stats, txm);
+	}
+
+	txvq->stats.packets += nb_tx;
+
+	if (likely(nb_tx)) {
+		vq_update_avail_idx(vq);
+
+		if (unlikely(virtqueue_kick_prepare(vq))) {
+			virtqueue_notify(vq);
+			PMD_TX_LOG(DEBUG, "Notified backend after xmit");
+		}
+	}
+
+	return nb_tx;
+}
+
+uint16_t
+virtio_xmit_pkts_inorder(void *tx_queue,
+			struct rte_mbuf **tx_pkts,
+			uint16_t nb_pkts)
+{
+	struct virtnet_tx *txvq = tx_queue;
+	struct virtqueue *vq = txvq->vq;
+	struct virtio_hw *hw = vq->hw;
+	uint16_t hdr_size = hw->vtnet_hdr_size;
+	uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
+	struct rte_mbuf *inorder_pkts[nb_pkts];
+	int error;
+
+	if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
+		return nb_tx;
+
+	if (unlikely(nb_pkts < 1))
+		return nb_pkts;
+
+	VIRTQUEUE_DUMP(vq);
+	PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
+	nb_used = VIRTQUEUE_NUSED(vq);
+
+	virtio_rmb();
+	if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
+		virtio_xmit_cleanup_inorder(vq, nb_used);
+
+	if (unlikely(!vq->vq_free_cnt))
+		virtio_xmit_cleanup_inorder(vq, nb_used);
+
+	nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
+
+	for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
+		struct rte_mbuf *txm = tx_pkts[nb_tx];
+		int slots, need;
+
+		/* Do VLAN tag insertion */
+		if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
+			error = rte_vlan_insert(&txm);
+			if (unlikely(error)) {
+				rte_pktmbuf_free(txm);
+				continue;
+			}
+		}
+
+		/* optimize ring usage */
+		if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
+		     vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
+		     rte_mbuf_refcnt_read(txm) == 1 &&
+		     RTE_MBUF_DIRECT(txm) &&
+		     txm->nb_segs == 1 &&
+		     rte_pktmbuf_headroom(txm) >= hdr_size &&
+		     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
+				__alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
+			inorder_pkts[nb_inorder_pkts] = txm;
+			nb_inorder_pkts++;
+
+			txvq->stats.bytes += txm->pkt_len;
+			virtio_update_packet_stats(&txvq->stats, txm);
+			continue;
+		}
+
+		if (nb_inorder_pkts) {
+			virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
+							nb_inorder_pkts);
+			nb_inorder_pkts = 0;
+		}
+
+		slots = txm->nb_segs + 1;
+		need = slots - vq->vq_free_cnt;
+		if (unlikely(need > 0)) {
+			nb_used = VIRTQUEUE_NUSED(vq);
+			virtio_rmb();
+			need = RTE_MIN(need, (int)nb_used);
+
+			virtio_xmit_cleanup_inorder(vq, need);
+
+			need = slots - vq->vq_free_cnt;
+
+			if (unlikely(need > 0)) {
+				PMD_TX_LOG(ERR,
+					"No free tx descriptors to transmit");
+				break;
+			}
+		}
+		/* Enqueue Packet buffers */
+		virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
 
 		txvq->stats.bytes += txm->pkt_len;
 		virtio_update_packet_stats(&txvq->stats, txm);
 	}
 
+	/* Transmit all inorder packets */
+	if (nb_inorder_pkts)
+		virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
+						nb_inorder_pkts);
+
 	txvq->stats.packets += nb_tx;
 
 	if (likely(nb_tx)) {
@@ -1118,5 +1549,7 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		}
 	}
 
+	VIRTQUEUE_DUMP(vq);
+
 	return nb_tx;
 }