Imported Upstream version 16.04

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

1 files changed, 1105 insertions, 0 deletions

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
new file mode 100644
index 00000000..4ac0456c
--- /dev/null
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -0,0 +1,1105 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/queue.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <rte_byteorder.h>
+#include <rte_common.h>
+#include <rte_cycles.h>
+#include <rte_log.h>
+#include <rte_debug.h>
+#include <rte_interrupts.h>
+#include <rte_pci.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_ring.h>
+#include <rte_mempool.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_prefetch.h>
+#include <rte_ip.h>
+#include <rte_udp.h>
+#include <rte_tcp.h>
+#include <rte_sctp.h>
+#include <rte_string_fns.h>
+#include <rte_errno.h>
+
+#include "base/vmxnet3_defs.h"
+#include "vmxnet3_ring.h"
+
+#include "vmxnet3_logs.h"
+#include "vmxnet3_ethdev.h"
+
+static const uint32_t rxprod_reg[2] = {VMXNET3_REG_RXPROD, VMXNET3_REG_RXPROD2};
+
+static int vmxnet3_post_rx_bufs(vmxnet3_rx_queue_t*, uint8_t);
+static void vmxnet3_tq_tx_complete(vmxnet3_tx_queue_t *);
+#ifdef RTE_LIBRTE_VMXNET3_DEBUG_DRIVER_NOT_USED
+static void vmxnet3_rxq_dump(struct vmxnet3_rx_queue *);
+static void vmxnet3_txq_dump(struct vmxnet3_tx_queue *);
+#endif
+
+static struct rte_mbuf *
+rte_rxmbuf_alloc(struct rte_mempool *mp)
+{
+	struct rte_mbuf *m;
+
+	m = __rte_mbuf_raw_alloc(mp);
+	__rte_mbuf_sanity_check_raw(m, 0);
+	return m;
+}
+
+#ifdef RTE_LIBRTE_VMXNET3_DEBUG_DRIVER_NOT_USED
+static void
+vmxnet3_rxq_dump(struct vmxnet3_rx_queue *rxq)
+{
+	uint32_t avail = 0;
+
+	if (rxq == NULL)
+		return;
+
+	PMD_RX_LOG(DEBUG,
+		   "RXQ: cmd0 base : 0x%p cmd1 base : 0x%p comp ring base : 0x%p.",
+		   rxq->cmd_ring[0].base, rxq->cmd_ring[1].base, rxq->comp_ring.base);
+	PMD_RX_LOG(DEBUG,
+		   "RXQ: cmd0 basePA : 0x%lx cmd1 basePA : 0x%lx comp ring basePA : 0x%lx.",
+		   (unsigned long)rxq->cmd_ring[0].basePA,
+		   (unsigned long)rxq->cmd_ring[1].basePA,
+		   (unsigned long)rxq->comp_ring.basePA);
+
+	avail = vmxnet3_cmd_ring_desc_avail(&rxq->cmd_ring[0]);
+	PMD_RX_LOG(DEBUG,
+		   "RXQ:cmd0: size=%u; free=%u; next2proc=%u; queued=%u",
+		   (uint32_t)rxq->cmd_ring[0].size, avail,
+		   rxq->comp_ring.next2proc,
+		   rxq->cmd_ring[0].size - avail);
+
+	avail = vmxnet3_cmd_ring_desc_avail(&rxq->cmd_ring[1]);
+	PMD_RX_LOG(DEBUG, "RXQ:cmd1 size=%u; free=%u; next2proc=%u; queued=%u",
+		   (uint32_t)rxq->cmd_ring[1].size, avail, rxq->comp_ring.next2proc,
+		   rxq->cmd_ring[1].size - avail);
+
+}
+
+static void
+vmxnet3_txq_dump(struct vmxnet3_tx_queue *txq)
+{
+	uint32_t avail = 0;
+
+	if (txq == NULL)
+		return;
+
+	PMD_TX_LOG(DEBUG, "TXQ: cmd base : 0x%p comp ring base : 0x%p data ring base : 0x%p.",
+		   txq->cmd_ring.base, txq->comp_ring.base, txq->data_ring.base);
+	PMD_TX_LOG(DEBUG, "TXQ: cmd basePA : 0x%lx comp ring basePA : 0x%lx data ring basePA : 0x%lx.",
+		   (unsigned long)txq->cmd_ring.basePA,
+		   (unsigned long)txq->comp_ring.basePA,
+		   (unsigned long)txq->data_ring.basePA);
+
+	avail = vmxnet3_cmd_ring_desc_avail(&txq->cmd_ring);
+	PMD_TX_LOG(DEBUG, "TXQ: size=%u; free=%u; next2proc=%u; queued=%u",
+		   (uint32_t)txq->cmd_ring.size, avail,
+		   txq->comp_ring.next2proc, txq->cmd_ring.size - avail);
+}
+#endif
+
+static void
+vmxnet3_cmd_ring_release_mbufs(vmxnet3_cmd_ring_t *ring)
+{
+	while (ring->next2comp != ring->next2fill) {
+		/* No need to worry about tx desc ownership, device is quiesced by now. */
+		vmxnet3_buf_info_t *buf_info = ring->buf_info + ring->next2comp;
+
+		if (buf_info->m) {
+			rte_pktmbuf_free(buf_info->m);
+			buf_info->m = NULL;
+			buf_info->bufPA = 0;
+			buf_info->len = 0;
+		}
+		vmxnet3_cmd_ring_adv_next2comp(ring);
+	}
+}
+
+static void
+vmxnet3_cmd_ring_release(vmxnet3_cmd_ring_t *ring)
+{
+	vmxnet3_cmd_ring_release_mbufs(ring);
+	rte_free(ring->buf_info);
+	ring->buf_info = NULL;
+}
+
+
+void
+vmxnet3_dev_tx_queue_release(void *txq)
+{
+	vmxnet3_tx_queue_t *tq = txq;
+
+	if (tq != NULL) {
+		/* Release the cmd_ring */
+		vmxnet3_cmd_ring_release(&tq->cmd_ring);
+	}
+}
+
+void
+vmxnet3_dev_rx_queue_release(void *rxq)
+{
+	int i;
+	vmxnet3_rx_queue_t *rq = rxq;
+
+	if (rq != NULL) {
+		/* Release both the cmd_rings */
+		for (i = 0; i < VMXNET3_RX_CMDRING_SIZE; i++)
+			vmxnet3_cmd_ring_release(&rq->cmd_ring[i]);
+	}
+}
+
+static void
+vmxnet3_dev_tx_queue_reset(void *txq)
+{
+	vmxnet3_tx_queue_t *tq = txq;
+	struct vmxnet3_cmd_ring *ring = &tq->cmd_ring;
+	struct vmxnet3_comp_ring *comp_ring = &tq->comp_ring;
+	struct vmxnet3_data_ring *data_ring = &tq->data_ring;
+	int size;
+
+	if (tq != NULL) {
+		/* Release the cmd_ring mbufs */
+		vmxnet3_cmd_ring_release_mbufs(&tq->cmd_ring);
+	}
+
+	/* Tx vmxnet rings structure initialization*/
+	ring->next2fill = 0;
+	ring->next2comp = 0;
+	ring->gen = VMXNET3_INIT_GEN;
+	comp_ring->next2proc = 0;
+	comp_ring->gen = VMXNET3_INIT_GEN;
+
+	size = sizeof(struct Vmxnet3_TxDesc) * ring->size;
+	size += sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size;
+	size += sizeof(struct Vmxnet3_TxDataDesc) * data_ring->size;
+
+	memset(ring->base, 0, size);
+}
+
+static void
+vmxnet3_dev_rx_queue_reset(void *rxq)
+{
+	int i;
+	vmxnet3_rx_queue_t *rq = rxq;
+	struct vmxnet3_cmd_ring *ring0, *ring1;
+	struct vmxnet3_comp_ring *comp_ring;
+	int size;
+
+	if (rq != NULL) {
+		/* Release both the cmd_rings mbufs */
+		for (i = 0; i < VMXNET3_RX_CMDRING_SIZE; i++)
+			vmxnet3_cmd_ring_release_mbufs(&rq->cmd_ring[i]);
+	}
+
+	ring0 = &rq->cmd_ring[0];
+	ring1 = &rq->cmd_ring[1];
+	comp_ring = &rq->comp_ring;
+
+	/* Rx vmxnet rings structure initialization */
+	ring0->next2fill = 0;
+	ring1->next2fill = 0;
+	ring0->next2comp = 0;
+	ring1->next2comp = 0;
+	ring0->gen = VMXNET3_INIT_GEN;
+	ring1->gen = VMXNET3_INIT_GEN;
+	comp_ring->next2proc = 0;
+	comp_ring->gen = VMXNET3_INIT_GEN;
+
+	size = sizeof(struct Vmxnet3_RxDesc) * (ring0->size + ring1->size);
+	size += sizeof(struct Vmxnet3_RxCompDesc) * comp_ring->size;
+
+	memset(ring0->base, 0, size);
+}
+
+void
+vmxnet3_dev_clear_queues(struct rte_eth_dev *dev)
+{
+	unsigned i;
+
+	PMD_INIT_FUNC_TRACE();
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		struct vmxnet3_tx_queue *txq = dev->data->tx_queues[i];
+
+		if (txq != NULL) {
+			txq->stopped = TRUE;
+			vmxnet3_dev_tx_queue_reset(txq);
+		}
+	}
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		struct vmxnet3_rx_queue *rxq = dev->data->rx_queues[i];
+
+		if (rxq != NULL) {
+			rxq->stopped = TRUE;
+			vmxnet3_dev_rx_queue_reset(rxq);
+		}
+	}
+}
+
+static int
+vmxnet3_unmap_pkt(uint16_t eop_idx, vmxnet3_tx_queue_t *txq)
+{
+	int completed = 0;
+	struct rte_mbuf *mbuf;
+
+	/* Release cmd_ring descriptor and free mbuf */
+	VMXNET3_ASSERT(txq->cmd_ring.base[eop_idx].txd.eop == 1);
+
+	mbuf = txq->cmd_ring.buf_info[eop_idx].m;
+	if (mbuf == NULL)
+		rte_panic("EOP desc does not point to a valid mbuf");
+	rte_pktmbuf_free(mbuf);
+
+	txq->cmd_ring.buf_info[eop_idx].m = NULL;
+
+	while (txq->cmd_ring.next2comp != eop_idx) {
+		/* no out-of-order completion */
+		VMXNET3_ASSERT(txq->cmd_ring.base[txq->cmd_ring.next2comp].txd.cq == 0);
+		vmxnet3_cmd_ring_adv_next2comp(&txq->cmd_ring);
+		completed++;
+	}
+
+	/* Mark the txd for which tcd was generated as completed */
+	vmxnet3_cmd_ring_adv_next2comp(&txq->cmd_ring);
+
+	return completed + 1;
+}
+
+static void
+vmxnet3_tq_tx_complete(vmxnet3_tx_queue_t *txq)
+{
+	int completed = 0;
+	vmxnet3_comp_ring_t *comp_ring = &txq->comp_ring;
+	struct Vmxnet3_TxCompDesc *tcd = (struct Vmxnet3_TxCompDesc *)
+		(comp_ring->base + comp_ring->next2proc);
+
+	while (tcd->gen == comp_ring->gen) {
+		completed += vmxnet3_unmap_pkt(tcd->txdIdx, txq);
+
+		vmxnet3_comp_ring_adv_next2proc(comp_ring);
+		tcd = (struct Vmxnet3_TxCompDesc *)(comp_ring->base +
+						    comp_ring->next2proc);
+	}
+
+	PMD_TX_LOG(DEBUG, "Processed %d tx comps & command descs.", completed);
+}
+
+uint16_t
+vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+		  uint16_t nb_pkts)
+{
+	uint16_t nb_tx;
+	vmxnet3_tx_queue_t *txq = tx_queue;
+	struct vmxnet3_hw *hw = txq->hw;
+	Vmxnet3_TxQueueCtrl *txq_ctrl = &txq->shared->ctrl;
+	uint32_t deferred = rte_le_to_cpu_32(txq_ctrl->txNumDeferred);
+
+	if (unlikely(txq->stopped)) {
+		PMD_TX_LOG(DEBUG, "Tx queue is stopped.");
+		return 0;
+	}
+
+	/* Free up the comp_descriptors aggressively */
+	vmxnet3_tq_tx_complete(txq);
+
+	nb_tx = 0;
+	while (nb_tx < nb_pkts) {
+		Vmxnet3_GenericDesc *gdesc;
+		vmxnet3_buf_info_t *tbi;
+		uint32_t first2fill, avail, dw2;
+		struct rte_mbuf *txm = tx_pkts[nb_tx];
+		struct rte_mbuf *m_seg = txm;
+		int copy_size = 0;
+		bool tso = (txm->ol_flags & PKT_TX_TCP_SEG) != 0;
+		/* # of descriptors needed for a packet. */
+		unsigned count = txm->nb_segs;
+
+		avail = vmxnet3_cmd_ring_desc_avail(&txq->cmd_ring);
+		if (count > avail) {
+			/* Is command ring full? */
+			if (unlikely(avail == 0)) {
+				PMD_TX_LOG(DEBUG, "No free ring descriptors");
+				txq->stats.tx_ring_full++;
+				txq->stats.drop_total += (nb_pkts - nb_tx);
+				break;
+			}
+
+			/* Command ring is not full but cannot handle the
+			 * multi-segmented packet. Let's try the next packet
+			 * in this case.
+			 */
+			PMD_TX_LOG(DEBUG, "Running out of ring descriptors "
+				   "(avail %d needed %d)", avail, count);
+			txq->stats.drop_total++;
+			if (tso)
+				txq->stats.drop_tso++;
+			rte_pktmbuf_free(txm);
+			nb_tx++;
+			continue;
+		}
+
+		/* Drop non-TSO packet that is excessively fragmented */
+		if (unlikely(!tso && count > VMXNET3_MAX_TXD_PER_PKT)) {
+			PMD_TX_LOG(ERR, "Non-TSO packet cannot occupy more than %d tx "
+				   "descriptors. Packet dropped.", VMXNET3_MAX_TXD_PER_PKT);
+			txq->stats.drop_too_many_segs++;
+			txq->stats.drop_total++;
+			rte_pktmbuf_free(txm);
+			nb_tx++;
+			continue;
+		}
+
+		if (txm->nb_segs == 1 && rte_pktmbuf_pkt_len(txm) <= VMXNET3_HDR_COPY_SIZE) {
+			struct Vmxnet3_TxDataDesc *tdd;
+
+			tdd = txq->data_ring.base + txq->cmd_ring.next2fill;
+			copy_size = rte_pktmbuf_pkt_len(txm);
+			rte_memcpy(tdd->data, rte_pktmbuf_mtod(txm, char *), copy_size);
+		}
+
+		/* use the previous gen bit for the SOP desc */
+		dw2 = (txq->cmd_ring.gen ^ 0x1) << VMXNET3_TXD_GEN_SHIFT;
+		first2fill = txq->cmd_ring.next2fill;
+		do {
+			/* Remember the transmit buffer for cleanup */
+			tbi = txq->cmd_ring.buf_info + txq->cmd_ring.next2fill;
+
+			/* NB: the following assumes that VMXNET3 maximum
+			 * transmit buffer size (16K) is greater than
+			 * maximum size of mbuf segment size.
+			 */
+			gdesc = txq->cmd_ring.base + txq->cmd_ring.next2fill;
+			if (copy_size)
+				gdesc->txd.addr = rte_cpu_to_le_64(txq->data_ring.basePA +
+								txq->cmd_ring.next2fill *
+								sizeof(struct Vmxnet3_TxDataDesc));
+			else
+				gdesc->txd.addr = rte_mbuf_data_dma_addr(m_seg);
+
+			gdesc->dword[2] = dw2 | m_seg->data_len;
+			gdesc->dword[3] = 0;
+
+			/* move to the next2fill descriptor */
+			vmxnet3_cmd_ring_adv_next2fill(&txq->cmd_ring);
+
+			/* use the right gen for non-SOP desc */
+			dw2 = txq->cmd_ring.gen << VMXNET3_TXD_GEN_SHIFT;
+		} while ((m_seg = m_seg->next) != NULL);
+
+		/* set the last buf_info for the pkt */
+		tbi->m = txm;
+		/* Update the EOP descriptor */
+		gdesc->dword[3] |= VMXNET3_TXD_EOP | VMXNET3_TXD_CQ;
+
+		/* Add VLAN tag if present */
+		gdesc = txq->cmd_ring.base + first2fill;
+		if (txm->ol_flags & PKT_TX_VLAN_PKT) {
+			gdesc->txd.ti = 1;
+			gdesc->txd.tci = txm->vlan_tci;
+		}
+
+		if (tso) {
+			uint16_t mss = txm->tso_segsz;
+
+			VMXNET3_ASSERT(mss > 0);
+
+			gdesc->txd.hlen = txm->l2_len + txm->l3_len + txm->l4_len;
+			gdesc->txd.om = VMXNET3_OM_TSO;
+			gdesc->txd.msscof = mss;
+
+			deferred += (rte_pktmbuf_pkt_len(txm) - gdesc->txd.hlen + mss - 1) / mss;
+		} else if (txm->ol_flags & PKT_TX_L4_MASK) {
+			gdesc->txd.om = VMXNET3_OM_CSUM;
+			gdesc->txd.hlen = txm->l2_len + txm->l3_len;
+
+			switch (txm->ol_flags & PKT_TX_L4_MASK) {
+			case PKT_TX_TCP_CKSUM:
+				gdesc->txd.msscof = gdesc->txd.hlen + offsetof(struct tcp_hdr, cksum);
+				break;
+			case PKT_TX_UDP_CKSUM:
+				gdesc->txd.msscof = gdesc->txd.hlen + offsetof(struct udp_hdr, dgram_cksum);
+				break;
+			default:
+				PMD_TX_LOG(WARNING, "requested cksum offload not supported %#llx",
+					   txm->ol_flags & PKT_TX_L4_MASK);
+				abort();
+			}
+			deferred++;
+		} else {
+			gdesc->txd.hlen = 0;
+			gdesc->txd.om = VMXNET3_OM_NONE;
+			gdesc->txd.msscof = 0;
+			deferred++;
+		}
+
+		/* flip the GEN bit on the SOP */
+		rte_compiler_barrier();
+		gdesc->dword[2] ^= VMXNET3_TXD_GEN;
+
+		txq_ctrl->txNumDeferred = rte_cpu_to_le_32(deferred);
+		nb_tx++;
+	}
+
+	PMD_TX_LOG(DEBUG, "vmxnet3 txThreshold: %u", rte_le_to_cpu_32(txq_ctrl->txThreshold));
+
+	if (deferred >= rte_le_to_cpu_32(txq_ctrl->txThreshold)) {
+		txq_ctrl->txNumDeferred = 0;
+		/* Notify vSwitch that packets are available. */
+		VMXNET3_WRITE_BAR0_REG(hw, (VMXNET3_REG_TXPROD + txq->queue_id * VMXNET3_REG_ALIGN),
+				       txq->cmd_ring.next2fill);
+	}
+
+	return nb_tx;
+}
+
+/*
+ *  Allocates mbufs and clusters. Post rx descriptors with buffer details
+ *  so that device can receive packets in those buffers.
+ *	Ring layout:
+ *      Among the two rings, 1st ring contains buffers of type 0 and type1.
+ *      bufs_per_pkt is set such that for non-LRO cases all the buffers required
+ *      by a frame will fit in 1st ring (1st buf of type0 and rest of type1).
+ *      2nd ring contains buffers of type 1 alone. Second ring mostly be used
+ *      only for LRO.
+ *
+ */
+static int
+vmxnet3_post_rx_bufs(vmxnet3_rx_queue_t *rxq, uint8_t ring_id)
+{
+	int err = 0;
+	uint32_t i = 0, val = 0;
+	struct vmxnet3_cmd_ring *ring = &rxq->cmd_ring[ring_id];
+
+	if (ring_id == 0) {
+		/* Usually: One HEAD type buf per packet
+		 * val = (ring->next2fill % rxq->hw->bufs_per_pkt) ?
+		 * VMXNET3_RXD_BTYPE_BODY : VMXNET3_RXD_BTYPE_HEAD;
+		 */
+
+		/* We use single packet buffer so all heads here */
+		val = VMXNET3_RXD_BTYPE_HEAD;
+	} else {
+		/* All BODY type buffers for 2nd ring */
+		val = VMXNET3_RXD_BTYPE_BODY;
+	}
+
+	while (vmxnet3_cmd_ring_desc_avail(ring) > 0) {
+		struct Vmxnet3_RxDesc *rxd;
+		struct rte_mbuf *mbuf;
+		vmxnet3_buf_info_t *buf_info = &ring->buf_info[ring->next2fill];
+
+		rxd = (struct Vmxnet3_RxDesc *)(ring->base + ring->next2fill);
+
+		/* Allocate blank mbuf for the current Rx Descriptor */
+		mbuf = rte_rxmbuf_alloc(rxq->mp);
+		if (unlikely(mbuf == NULL)) {
+			PMD_RX_LOG(ERR, "Error allocating mbuf");
+			rxq->stats.rx_buf_alloc_failure++;
+			err = ENOMEM;
+			break;
+		}
+
+		/*
+		 * Load mbuf pointer into buf_info[ring_size]
+		 * buf_info structure is equivalent to cookie for virtio-virtqueue
+		 */
+		buf_info->m = mbuf;
+		buf_info->len = (uint16_t)(mbuf->buf_len -
+					   RTE_PKTMBUF_HEADROOM);
+		buf_info->bufPA =
+			rte_mbuf_data_dma_addr_default(mbuf);
+
+		/* Load Rx Descriptor with the buffer's GPA */
+		rxd->addr = buf_info->bufPA;
+
+		/* After this point rxd->addr MUST not be NULL */
+		rxd->btype = val;
+		rxd->len = buf_info->len;
+		/* Flip gen bit at the end to change ownership */
+		rxd->gen = ring->gen;
+
+		vmxnet3_cmd_ring_adv_next2fill(ring);
+		i++;
+	}
+
+	/* Return error only if no buffers are posted at present */
+	if (vmxnet3_cmd_ring_desc_avail(ring) >= (ring->size - 1))
+		return -err;
+	else
+		return i;
+}
+
+
+/* Receive side checksum and other offloads */
+static void
+vmxnet3_rx_offload(const Vmxnet3_RxCompDesc *rcd, struct rte_mbuf *rxm)
+{
+	/* Check for hardware stripped VLAN tag */
+	if (rcd->ts) {
+		rxm->ol_flags |= PKT_RX_VLAN_PKT;
+		rxm->vlan_tci = rte_le_to_cpu_16((uint16_t)rcd->tci);
+	}
+
+	/* Check for RSS */
+	if (rcd->rssType != VMXNET3_RCD_RSS_TYPE_NONE) {
+		rxm->ol_flags |= PKT_RX_RSS_HASH;
+		rxm->hash.rss = rcd->rssHash;
+	}
+
+	/* Check packet type, checksum errors, etc. Only support IPv4 for now. */
+	if (rcd->v4) {
+		struct ether_hdr *eth = rte_pktmbuf_mtod(rxm, struct ether_hdr *);
+		struct ipv4_hdr *ip = (struct ipv4_hdr *)(eth + 1);
+
+		if (((ip->version_ihl & 0xf) << 2) > (int)sizeof(struct ipv4_hdr))
+			rxm->packet_type = RTE_PTYPE_L3_IPV4_EXT;
+		else
+			rxm->packet_type = RTE_PTYPE_L3_IPV4;
+
+		if (!rcd->cnc) {
+			if (!rcd->ipc)
+				rxm->ol_flags |= PKT_RX_IP_CKSUM_BAD;
+
+			if ((rcd->tcp || rcd->udp) && !rcd->tuc)
+				rxm->ol_flags |= PKT_RX_L4_CKSUM_BAD;
+		}
+	}
+}
+
+/*
+ * Process the Rx Completion Ring of given vmxnet3_rx_queue
+ * for nb_pkts burst and return the number of packets received
+ */
+uint16_t
+vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+	uint16_t nb_rx;
+	uint32_t nb_rxd, idx;
+	uint8_t ring_idx;
+	vmxnet3_rx_queue_t *rxq;
+	Vmxnet3_RxCompDesc *rcd;
+	vmxnet3_buf_info_t *rbi;
+	Vmxnet3_RxDesc *rxd;
+	struct rte_mbuf *rxm = NULL;
+	struct vmxnet3_hw *hw;
+
+	nb_rx = 0;
+	ring_idx = 0;
+	nb_rxd = 0;
+	idx = 0;
+
+	rxq = rx_queue;
+	hw = rxq->hw;
+
+	rcd = &rxq->comp_ring.base[rxq->comp_ring.next2proc].rcd;
+
+	if (unlikely(rxq->stopped)) {
+		PMD_RX_LOG(DEBUG, "Rx queue is stopped.");
+		return 0;
+	}
+
+	while (rcd->gen == rxq->comp_ring.gen) {
+		if (nb_rx >= nb_pkts)
+			break;
+
+		idx = rcd->rxdIdx;
+		ring_idx = (uint8_t)((rcd->rqID == rxq->qid1) ? 0 : 1);
+		rxd = (Vmxnet3_RxDesc *)rxq->cmd_ring[ring_idx].base + idx;
+		rbi = rxq->cmd_ring[ring_idx].buf_info + idx;
+
+		PMD_RX_LOG(DEBUG, "rxd idx: %d ring idx: %d.", idx, ring_idx);
+
+		VMXNET3_ASSERT(rcd->len <= rxd->len);
+		VMXNET3_ASSERT(rbi->m);
+
+		/* Get the packet buffer pointer from buf_info */
+		rxm = rbi->m;
+
+		/* Clear descriptor associated buf_info to be reused */
+		rbi->m = NULL;
+		rbi->bufPA = 0;
+
+		/* Update the index that we received a packet */
+		rxq->cmd_ring[ring_idx].next2comp = idx;
+
+		/* For RCD with EOP set, check if there is frame error */
+		if (unlikely(rcd->eop && rcd->err)) {
+			rxq->stats.drop_total++;
+			rxq->stats.drop_err++;
+
+			if (!rcd->fcs) {
+				rxq->stats.drop_fcs++;
+				PMD_RX_LOG(ERR, "Recv packet dropped due to frame err.");
+			}
+			PMD_RX_LOG(ERR, "Error in received packet rcd#:%d rxd:%d",
+				   (int)(rcd - (struct Vmxnet3_RxCompDesc *)
+					 rxq->comp_ring.base), rcd->rxdIdx);
+			rte_pktmbuf_free_seg(rxm);
+			goto rcd_done;
+		}
+
+
+		/* Initialize newly received packet buffer */
+		rxm->port = rxq->port_id;
+		rxm->nb_segs = 1;
+		rxm->next = NULL;
+		rxm->pkt_len = (uint16_t)rcd->len;
+		rxm->data_len = (uint16_t)rcd->len;
+		rxm->data_off = RTE_PKTMBUF_HEADROOM;
+		rxm->ol_flags = 0;
+		rxm->vlan_tci = 0;
+
+		/*
+		 * If this is the first buffer of the received packet,
+		 * set the pointer to the first mbuf of the packet
+		 * Otherwise, update the total length and the number of segments
+		 * of the current scattered packet, and update the pointer to
+		 * the last mbuf of the current packet.
+		 */
+		if (rcd->sop) {
+			VMXNET3_ASSERT(rxd->btype == VMXNET3_RXD_BTYPE_HEAD);
+
+			if (unlikely(rcd->len == 0)) {
+				VMXNET3_ASSERT(rcd->eop);
+
+				PMD_RX_LOG(DEBUG,
+					   "Rx buf was skipped. rxring[%d][%d])",
+					   ring_idx, idx);
+				rte_pktmbuf_free_seg(rxm);
+				goto rcd_done;
+			}
+
+			rxq->start_seg = rxm;
+			vmxnet3_rx_offload(rcd, rxm);
+		} else {
+			struct rte_mbuf *start = rxq->start_seg;
+
+			VMXNET3_ASSERT(rxd->btype == VMXNET3_RXD_BTYPE_BODY);
+
+			start->pkt_len += rxm->data_len;
+			start->nb_segs++;
+
+			rxq->last_seg->next = rxm;
+		}
+		rxq->last_seg = rxm;
+
+		if (rcd->eop) {
+			rx_pkts[nb_rx++] = rxq->start_seg;
+			rxq->start_seg = NULL;
+		}
+
+rcd_done:
+		rxq->cmd_ring[ring_idx].next2comp = idx;
+		VMXNET3_INC_RING_IDX_ONLY(rxq->cmd_ring[ring_idx].next2comp, rxq->cmd_ring[ring_idx].size);
+
+		/* It's time to allocate some new buf and renew descriptors */
+		vmxnet3_post_rx_bufs(rxq, ring_idx);
+		if (unlikely(rxq->shared->ctrl.updateRxProd)) {
+			VMXNET3_WRITE_BAR0_REG(hw, rxprod_reg[ring_idx] + (rxq->queue_id * VMXNET3_REG_ALIGN),
+					       rxq->cmd_ring[ring_idx].next2fill);
+		}
+
+		/* Advance to the next descriptor in comp_ring */
+		vmxnet3_comp_ring_adv_next2proc(&rxq->comp_ring);
+
+		rcd = &rxq->comp_ring.base[rxq->comp_ring.next2proc].rcd;
+		nb_rxd++;
+		if (nb_rxd > rxq->cmd_ring[0].size) {
+			PMD_RX_LOG(ERR,
+				   "Used up quota of receiving packets,"
+				   " relinquish control.");
+			break;
+		}
+	}
+
+	return nb_rx;
+}
+
+/*
+ * Create memzone for device rings. malloc can't be used as the physical address is
+ * needed. If the memzone is already created, then this function returns a ptr
+ * to the old one.
+ */
+static const struct rte_memzone *
+ring_dma_zone_reserve(struct rte_eth_dev *dev, const char *ring_name,
+		      uint16_t queue_id, uint32_t ring_size, int socket_id)
+{
+	char z_name[RTE_MEMZONE_NAMESIZE];
+	const struct rte_memzone *mz;
+
+	snprintf(z_name, sizeof(z_name), "%s_%s_%d_%d",
+			dev->driver->pci_drv.name, ring_name,
+			dev->data->port_id, queue_id);
+
+	mz = rte_memzone_lookup(z_name);
+	if (mz)
+		return mz;
+
+	return rte_memzone_reserve_aligned(z_name, ring_size,
+			socket_id, 0, VMXNET3_RING_BA_ALIGN);
+}
+
+int
+vmxnet3_dev_tx_queue_setup(struct rte_eth_dev *dev,
+			   uint16_t queue_idx,
+			   uint16_t nb_desc,
+			   unsigned int socket_id,
+			   __attribute__((unused)) const struct rte_eth_txconf *tx_conf)
+{
+	struct vmxnet3_hw *hw = dev->data->dev_private;
+	const struct rte_memzone *mz;
+	struct vmxnet3_tx_queue *txq;
+	struct vmxnet3_cmd_ring *ring;
+	struct vmxnet3_comp_ring *comp_ring;
+	struct vmxnet3_data_ring *data_ring;
+	int size;
+
+	PMD_INIT_FUNC_TRACE();
+
+	if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMSCTP) !=
+	    ETH_TXQ_FLAGS_NOXSUMSCTP) {
+		PMD_INIT_LOG(ERR, "SCTP checksum offload not supported");
+		return -EINVAL;
+	}
+
+	txq = rte_zmalloc("ethdev_tx_queue", sizeof(struct vmxnet3_tx_queue), RTE_CACHE_LINE_SIZE);
+	if (txq == NULL) {
+		PMD_INIT_LOG(ERR, "Can not allocate tx queue structure");
+		return -ENOMEM;
+	}
+
+	txq->queue_id = queue_idx;
+	txq->port_id = dev->data->port_id;
+	txq->shared = &hw->tqd_start[queue_idx];
+	txq->hw = hw;
+	txq->qid = queue_idx;
+	txq->stopped = TRUE;
+
+	ring = &txq->cmd_ring;
+	comp_ring = &txq->comp_ring;
+	data_ring = &txq->data_ring;
+
+	/* Tx vmxnet ring length should be between 512-4096 */
+	if (nb_desc < VMXNET3_DEF_TX_RING_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Tx Ring Size Min: %u",
+			     VMXNET3_DEF_TX_RING_SIZE);
+		return -EINVAL;
+	} else if (nb_desc > VMXNET3_TX_RING_MAX_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Tx Ring Size Max: %u",
+			     VMXNET3_TX_RING_MAX_SIZE);
+		return -EINVAL;
+	} else {
+		ring->size = nb_desc;
+		ring->size &= ~VMXNET3_RING_SIZE_MASK;
+	}
+	comp_ring->size = data_ring->size = ring->size;
+
+	/* Tx vmxnet rings structure initialization*/
+	ring->next2fill = 0;
+	ring->next2comp = 0;
+	ring->gen = VMXNET3_INIT_GEN;
+	comp_ring->next2proc = 0;
+	comp_ring->gen = VMXNET3_INIT_GEN;
+
+	size = sizeof(struct Vmxnet3_TxDesc) * ring->size;
+	size += sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size;
+	size += sizeof(struct Vmxnet3_TxDataDesc) * data_ring->size;
+
+	mz = ring_dma_zone_reserve(dev, "txdesc", queue_idx, size, socket_id);
+	if (mz == NULL) {
+		PMD_INIT_LOG(ERR, "ERROR: Creating queue descriptors zone");
+		return -ENOMEM;
+	}
+	memset(mz->addr, 0, mz->len);
+
+	/* cmd_ring initialization */
+	ring->base = mz->addr;
+	ring->basePA = mz->phys_addr;
+
+	/* comp_ring initialization */
+	comp_ring->base = ring->base + ring->size;
+	comp_ring->basePA = ring->basePA +
+		(sizeof(struct Vmxnet3_TxDesc) * ring->size);
+
+	/* data_ring initialization */
+	data_ring->base = (Vmxnet3_TxDataDesc *)(comp_ring->base + comp_ring->size);
+	data_ring->basePA = comp_ring->basePA +
+			(sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size);
+
+	/* cmd_ring0 buf_info allocation */
+	ring->buf_info = rte_zmalloc("tx_ring_buf_info",
+				     ring->size * sizeof(vmxnet3_buf_info_t), RTE_CACHE_LINE_SIZE);
+	if (ring->buf_info == NULL) {
+		PMD_INIT_LOG(ERR, "ERROR: Creating tx_buf_info structure");
+		return -ENOMEM;
+	}
+
+	/* Update the data portion with txq */
+	dev->data->tx_queues[queue_idx] = txq;
+
+	return 0;
+}
+
+int
+vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
+			   uint16_t queue_idx,
+			   uint16_t nb_desc,
+			   unsigned int socket_id,
+			   __attribute__((unused)) const struct rte_eth_rxconf *rx_conf,
+			   struct rte_mempool *mp)
+{
+	const struct rte_memzone *mz;
+	struct vmxnet3_rx_queue *rxq;
+	struct vmxnet3_hw     *hw = dev->data->dev_private;
+	struct vmxnet3_cmd_ring *ring0, *ring1, *ring;
+	struct vmxnet3_comp_ring *comp_ring;
+	int size;
+	uint8_t i;
+	char mem_name[32];
+
+	PMD_INIT_FUNC_TRACE();
+
+	rxq = rte_zmalloc("ethdev_rx_queue", sizeof(struct vmxnet3_rx_queue), RTE_CACHE_LINE_SIZE);
+	if (rxq == NULL) {
+		PMD_INIT_LOG(ERR, "Can not allocate rx queue structure");
+		return -ENOMEM;
+	}
+
+	rxq->mp = mp;
+	rxq->queue_id = queue_idx;
+	rxq->port_id = dev->data->port_id;
+	rxq->shared = &hw->rqd_start[queue_idx];
+	rxq->hw = hw;
+	rxq->qid1 = queue_idx;
+	rxq->qid2 = queue_idx + hw->num_rx_queues;
+	rxq->stopped = TRUE;
+
+	ring0 = &rxq->cmd_ring[0];
+	ring1 = &rxq->cmd_ring[1];
+	comp_ring = &rxq->comp_ring;
+
+	/* Rx vmxnet rings length should be between 256-4096 */
+	if (nb_desc < VMXNET3_DEF_RX_RING_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Min: 256");
+		return -EINVAL;
+	} else if (nb_desc > VMXNET3_RX_RING_MAX_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Max: 4096");
+		return -EINVAL;
+	} else {
+		ring0->size = nb_desc;
+		ring0->size &= ~VMXNET3_RING_SIZE_MASK;
+		ring1->size = ring0->size;
+	}
+
+	comp_ring->size = ring0->size + ring1->size;
+
+	/* Rx vmxnet rings structure initialization */
+	ring0->next2fill = 0;
+	ring1->next2fill = 0;
+	ring0->next2comp = 0;
+	ring1->next2comp = 0;
+	ring0->gen = VMXNET3_INIT_GEN;
+	ring1->gen = VMXNET3_INIT_GEN;
+	comp_ring->next2proc = 0;
+	comp_ring->gen = VMXNET3_INIT_GEN;
+
+	size = sizeof(struct Vmxnet3_RxDesc) * (ring0->size + ring1->size);
+	size += sizeof(struct Vmxnet3_RxCompDesc) * comp_ring->size;
+
+	mz = ring_dma_zone_reserve(dev, "rxdesc", queue_idx, size, socket_id);
+	if (mz == NULL) {
+		PMD_INIT_LOG(ERR, "ERROR: Creating queue descriptors zone");
+		return -ENOMEM;
+	}
+	memset(mz->addr, 0, mz->len);
+
+	/* cmd_ring0 initialization */
+	ring0->base = mz->addr;
+	ring0->basePA = mz->phys_addr;
+
+	/* cmd_ring1 initialization */
+	ring1->base = ring0->base + ring0->size;
+	ring1->basePA = ring0->basePA + sizeof(struct Vmxnet3_RxDesc) * ring0->size;
+
+	/* comp_ring initialization */
+	comp_ring->base = ring1->base + ring1->size;
+	comp_ring->basePA = ring1->basePA + sizeof(struct Vmxnet3_RxDesc) *
+		ring1->size;
+
+	/* cmd_ring0-cmd_ring1 buf_info allocation */
+	for (i = 0; i < VMXNET3_RX_CMDRING_SIZE; i++) {
+
+		ring = &rxq->cmd_ring[i];
+		ring->rid = i;
+		snprintf(mem_name, sizeof(mem_name), "rx_ring_%d_buf_info", i);
+
+		ring->buf_info = rte_zmalloc(mem_name, ring->size * sizeof(vmxnet3_buf_info_t), RTE_CACHE_LINE_SIZE);
+		if (ring->buf_info == NULL) {
+			PMD_INIT_LOG(ERR, "ERROR: Creating rx_buf_info structure");
+			return -ENOMEM;
+		}
+	}
+
+	/* Update the data portion with rxq */
+	dev->data->rx_queues[queue_idx] = rxq;
+
+	return 0;
+}
+
+/*
+ * Initializes Receive Unit
+ * Load mbufs in rx queue in advance
+ */
+int
+vmxnet3_dev_rxtx_init(struct rte_eth_dev *dev)
+{
+	struct vmxnet3_hw *hw = dev->data->dev_private;
+
+	int i, ret;
+	uint8_t j;
+
+	PMD_INIT_FUNC_TRACE();
+
+	for (i = 0; i < hw->num_rx_queues; i++) {
+		vmxnet3_rx_queue_t *rxq = dev->data->rx_queues[i];
+
+		for (j = 0; j < VMXNET3_RX_CMDRING_SIZE; j++) {
+			/* Passing 0 as alloc_num will allocate full ring */
+			ret = vmxnet3_post_rx_bufs(rxq, j);
+			if (ret <= 0) {
+				PMD_INIT_LOG(ERR, "ERROR: Posting Rxq: %d buffers ring: %d", i, j);
+				return -ret;
+			}
+			/* Updating device with the index:next2fill to fill the mbufs for coming packets */
+			if (unlikely(rxq->shared->ctrl.updateRxProd)) {
+				VMXNET3_WRITE_BAR0_REG(hw, rxprod_reg[j] + (rxq->queue_id * VMXNET3_REG_ALIGN),
+						       rxq->cmd_ring[j].next2fill);
+			}
+		}
+		rxq->stopped = FALSE;
+		rxq->start_seg = NULL;
+	}
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		struct vmxnet3_tx_queue *txq = dev->data->tx_queues[i];
+
+		txq->stopped = FALSE;
+	}
+
+	return 0;
+}
+
+static uint8_t rss_intel_key[40] = {
+	0x6D, 0x5A, 0x56, 0xDA, 0x25, 0x5B, 0x0E, 0xC2,
+	0x41, 0x67, 0x25, 0x3D, 0x43, 0xA3, 0x8F, 0xB0,
+	0xD0, 0xCA, 0x2B, 0xCB, 0xAE, 0x7B, 0x30, 0xB4,
+	0x77, 0xCB, 0x2D, 0xA3, 0x80, 0x30, 0xF2, 0x0C,
+	0x6A, 0x42, 0xB7, 0x3B, 0xBE, 0xAC, 0x01, 0xFA,
+};
+
+/*
+ * Configure RSS feature
+ */
+int
+vmxnet3_rss_configure(struct rte_eth_dev *dev)
+{
+	struct vmxnet3_hw *hw = dev->data->dev_private;
+	struct VMXNET3_RSSConf *dev_rss_conf;
+	struct rte_eth_rss_conf *port_rss_conf;
+	uint64_t rss_hf;
+	uint8_t i, j;
+
+	PMD_INIT_FUNC_TRACE();
+
+	dev_rss_conf = hw->rss_conf;
+	port_rss_conf = &dev->data->dev_conf.rx_adv_conf.rss_conf;
+
+	/* loading hashFunc */
+	dev_rss_conf->hashFunc = VMXNET3_RSS_HASH_FUNC_TOEPLITZ;
+	/* loading hashKeySize */
+	dev_rss_conf->hashKeySize = VMXNET3_RSS_MAX_KEY_SIZE;
+	/* loading indTableSize : Must not exceed VMXNET3_RSS_MAX_IND_TABLE_SIZE (128)*/
+	dev_rss_conf->indTableSize = (uint16_t)(hw->num_rx_queues * 4);
+
+	if (port_rss_conf->rss_key == NULL) {
+		/* Default hash key */
+		port_rss_conf->rss_key = rss_intel_key;
+	}
+
+	/* loading hashKey */
+	memcpy(&dev_rss_conf->hashKey[0], port_rss_conf->rss_key, dev_rss_conf->hashKeySize);
+
+	/* loading indTable */
+	for (i = 0, j = 0; i < dev_rss_conf->indTableSize; i++, j++) {
+		if (j == dev->data->nb_rx_queues)
+			j = 0;
+		dev_rss_conf->indTable[i] = j;
+	}
+
+	/* loading hashType */
+	dev_rss_conf->hashType = 0;
+	rss_hf = port_rss_conf->rss_hf & VMXNET3_RSS_OFFLOAD_ALL;
+	if (rss_hf & ETH_RSS_IPV4)
+		dev_rss_conf->hashType |= VMXNET3_RSS_HASH_TYPE_IPV4;
+	if (rss_hf & ETH_RSS_NONFRAG_IPV4_TCP)
+		dev_rss_conf->hashType |= VMXNET3_RSS_HASH_TYPE_TCP_IPV4;
+	if (rss_hf & ETH_RSS_IPV6)
+		dev_rss_conf->hashType |= VMXNET3_RSS_HASH_TYPE_IPV6;
+	if (rss_hf & ETH_RSS_NONFRAG_IPV6_TCP)
+		dev_rss_conf->hashType |= VMXNET3_RSS_HASH_TYPE_TCP_IPV6;
+
+	return VMXNET3_SUCCESS;
+}