New upstream version 18.08upstream/18.08

Change-Id: I32fdf5e5016556d9c0a6d88ddaf1fc468961790a
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>

1 files changed, 674 insertions, 0 deletions

diff --git a/drivers/net/axgbe/axgbe_rxtx.c b/drivers/net/axgbe/axgbe_rxtx.c
new file mode 100644
index 00000000..c5fd5f41
--- /dev/null
+++ b/drivers/net/axgbe/axgbe_rxtx.c
@@ -0,0 +1,674 @@
+/*   SPDX-License-Identifier: BSD-3-Clause
+ *   Copyright(c) 2018 Advanced Micro Devices, Inc. All rights reserved.
+ *   Copyright(c) 2018 Synopsys, Inc. All rights reserved.
+ */
+
+#include "axgbe_ethdev.h"
+#include "axgbe_rxtx.h"
+#include "axgbe_phy.h"
+
+#include <rte_time.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+
+static void
+axgbe_rx_queue_release(struct axgbe_rx_queue *rx_queue)
+{
+	uint16_t i;
+	struct rte_mbuf **sw_ring;
+
+	if (rx_queue) {
+		sw_ring = rx_queue->sw_ring;
+		if (sw_ring) {
+			for (i = 0; i < rx_queue->nb_desc; i++) {
+				if (sw_ring[i])
+					rte_pktmbuf_free(sw_ring[i]);
+			}
+			rte_free(sw_ring);
+		}
+		rte_free(rx_queue);
+	}
+}
+
+void axgbe_dev_rx_queue_release(void *rxq)
+{
+	axgbe_rx_queue_release(rxq);
+}
+
+int axgbe_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
+			     uint16_t nb_desc, unsigned int socket_id,
+			     const struct rte_eth_rxconf *rx_conf,
+			     struct rte_mempool *mp)
+{
+	PMD_INIT_FUNC_TRACE();
+	uint32_t size;
+	const struct rte_memzone *dma;
+	struct axgbe_rx_queue *rxq;
+	uint32_t rx_desc = nb_desc;
+	struct axgbe_port *pdata =  dev->data->dev_private;
+
+	/*
+	 * validate Rx descriptors count
+	 * should be power of 2 and less than h/w supported
+	 */
+	if ((!rte_is_power_of_2(rx_desc)) ||
+	    rx_desc > pdata->rx_desc_count)
+		return -EINVAL;
+	/* First allocate the rx queue data structure */
+	rxq = rte_zmalloc_socket("ethdev RX queue",
+				 sizeof(struct axgbe_rx_queue),
+				 RTE_CACHE_LINE_SIZE, socket_id);
+	if (!rxq) {
+		PMD_INIT_LOG(ERR, "rte_zmalloc for rxq failed!");
+		return -ENOMEM;
+	}
+
+	rxq->cur = 0;
+	rxq->dirty = 0;
+	rxq->pdata = pdata;
+	rxq->mb_pool = mp;
+	rxq->queue_id = queue_idx;
+	rxq->port_id = dev->data->port_id;
+	rxq->nb_desc = rx_desc;
+	rxq->dma_regs = (void *)((uint8_t *)pdata->xgmac_regs + DMA_CH_BASE +
+		(DMA_CH_INC * rxq->queue_id));
+	rxq->dma_tail_reg = (volatile uint32_t *)((uint8_t *)rxq->dma_regs +
+						  DMA_CH_RDTR_LO);
+	if (rte_eth_dev_must_keep_crc(dev->data->dev_conf.rxmode.offloads))
+		rxq->crc_len = ETHER_CRC_LEN;
+	else
+		rxq->crc_len = 0;
+
+	/* CRC strip in AXGBE supports per port not per queue */
+	pdata->crc_strip_enable = (rxq->crc_len == 0) ? 1 : 0;
+	rxq->free_thresh = rx_conf->rx_free_thresh ?
+		rx_conf->rx_free_thresh : AXGBE_RX_FREE_THRESH;
+	if (rxq->free_thresh >  rxq->nb_desc)
+		rxq->free_thresh = rxq->nb_desc >> 3;
+
+	/* Allocate RX ring hardware descriptors */
+	size = rxq->nb_desc * sizeof(union axgbe_rx_desc);
+	dma = rte_eth_dma_zone_reserve(dev, "rx_ring", queue_idx, size, 128,
+				       socket_id);
+	if (!dma) {
+		PMD_DRV_LOG(ERR, "ring_dma_zone_reserve for rx_ring failed\n");
+		axgbe_rx_queue_release(rxq);
+		return -ENOMEM;
+	}
+	rxq->ring_phys_addr = (uint64_t)dma->phys_addr;
+	rxq->desc = (volatile union axgbe_rx_desc *)dma->addr;
+	memset((void *)rxq->desc, 0, size);
+	/* Allocate software ring */
+	size = rxq->nb_desc * sizeof(struct rte_mbuf *);
+	rxq->sw_ring = rte_zmalloc_socket("sw_ring", size,
+					  RTE_CACHE_LINE_SIZE,
+					  socket_id);
+	if (!rxq->sw_ring) {
+		PMD_DRV_LOG(ERR, "rte_zmalloc for sw_ring failed\n");
+		axgbe_rx_queue_release(rxq);
+		return -ENOMEM;
+	}
+	dev->data->rx_queues[queue_idx] = rxq;
+	if (!pdata->rx_queues)
+		pdata->rx_queues = dev->data->rx_queues;
+
+	return 0;
+}
+
+static void axgbe_prepare_rx_stop(struct axgbe_port *pdata,
+				  unsigned int queue)
+{
+	unsigned int rx_status;
+	unsigned long rx_timeout;
+
+	/* The Rx engine cannot be stopped if it is actively processing
+	 * packets. Wait for the Rx queue to empty the Rx fifo.  Don't
+	 * wait forever though...
+	 */
+	rx_timeout = rte_get_timer_cycles() + (AXGBE_DMA_STOP_TIMEOUT *
+					       rte_get_timer_hz());
+
+	while (time_before(rte_get_timer_cycles(), rx_timeout)) {
+		rx_status = AXGMAC_MTL_IOREAD(pdata, queue, MTL_Q_RQDR);
+		if ((AXGMAC_GET_BITS(rx_status, MTL_Q_RQDR, PRXQ) == 0) &&
+		    (AXGMAC_GET_BITS(rx_status, MTL_Q_RQDR, RXQSTS) == 0))
+			break;
+
+		rte_delay_us(900);
+	}
+
+	if (!time_before(rte_get_timer_cycles(), rx_timeout))
+		PMD_DRV_LOG(ERR,
+			    "timed out waiting for Rx queue %u to empty\n",
+			    queue);
+}
+
+void axgbe_dev_disable_rx(struct rte_eth_dev *dev)
+{
+	struct axgbe_rx_queue *rxq;
+	struct axgbe_port *pdata = dev->data->dev_private;
+	unsigned int i;
+
+	/* Disable MAC Rx */
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, DCRCC, 0);
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, CST, 0);
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, ACS, 0);
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, RE, 0);
+
+	/* Prepare for Rx DMA channel stop */
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+		axgbe_prepare_rx_stop(pdata, i);
+	}
+	/* Disable each Rx queue */
+	AXGMAC_IOWRITE(pdata, MAC_RQC0R, 0);
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+		/* Disable Rx DMA channel */
+		AXGMAC_DMA_IOWRITE_BITS(rxq, DMA_CH_RCR, SR, 0);
+	}
+}
+
+void axgbe_dev_enable_rx(struct rte_eth_dev *dev)
+{
+	struct axgbe_rx_queue *rxq;
+	struct axgbe_port *pdata = dev->data->dev_private;
+	unsigned int i;
+	unsigned int reg_val = 0;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+		/* Enable Rx DMA channel */
+		AXGMAC_DMA_IOWRITE_BITS(rxq, DMA_CH_RCR, SR, 1);
+	}
+
+	reg_val = 0;
+	for (i = 0; i < pdata->rx_q_count; i++)
+		reg_val |= (0x02 << (i << 1));
+	AXGMAC_IOWRITE(pdata, MAC_RQC0R, reg_val);
+
+	/* Enable MAC Rx */
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, DCRCC, 1);
+	/* Frame is forwarded after stripping CRC to application*/
+	if (pdata->crc_strip_enable) {
+		AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, CST, 1);
+		AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, ACS, 1);
+	}
+	AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, RE, 1);
+}
+
+/* Rx function one to one refresh */
+uint16_t
+axgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts)
+{
+	PMD_INIT_FUNC_TRACE();
+	uint16_t nb_rx = 0;
+	struct axgbe_rx_queue *rxq = rx_queue;
+	volatile union axgbe_rx_desc *desc;
+	uint64_t old_dirty = rxq->dirty;
+	struct rte_mbuf *mbuf, *tmbuf;
+	unsigned int err;
+	uint32_t error_status;
+	uint16_t idx, pidx, pkt_len;
+
+	idx = AXGBE_GET_DESC_IDX(rxq, rxq->cur);
+	while (nb_rx < nb_pkts) {
+		if (unlikely(idx == rxq->nb_desc))
+			idx = 0;
+
+		desc = &rxq->desc[idx];
+
+		if (AXGMAC_GET_BITS_LE(desc->write.desc3, RX_NORMAL_DESC3, OWN))
+			break;
+		tmbuf = rte_mbuf_raw_alloc(rxq->mb_pool);
+		if (unlikely(!tmbuf)) {
+			PMD_DRV_LOG(ERR, "RX mbuf alloc failed port_id = %u"
+				    " queue_id = %u\n",
+				    (unsigned int)rxq->port_id,
+				    (unsigned int)rxq->queue_id);
+			rte_eth_devices[
+				rxq->port_id].data->rx_mbuf_alloc_failed++;
+			break;
+		}
+		pidx = idx + 1;
+		if (unlikely(pidx == rxq->nb_desc))
+			pidx = 0;
+
+		rte_prefetch0(rxq->sw_ring[pidx]);
+		if ((pidx & 0x3) == 0) {
+			rte_prefetch0(&rxq->desc[pidx]);
+			rte_prefetch0(&rxq->sw_ring[pidx]);
+		}
+
+		mbuf = rxq->sw_ring[idx];
+		/* Check for any errors and free mbuf*/
+		err = AXGMAC_GET_BITS_LE(desc->write.desc3,
+					 RX_NORMAL_DESC3, ES);
+		error_status = 0;
+		if (unlikely(err)) {
+			error_status = desc->write.desc3 & AXGBE_ERR_STATUS;
+			if ((error_status != AXGBE_L3_CSUM_ERR) &&
+			    (error_status != AXGBE_L4_CSUM_ERR)) {
+				rxq->errors++;
+				rte_pktmbuf_free(mbuf);
+				goto err_set;
+			}
+		}
+		if (rxq->pdata->rx_csum_enable) {
+			mbuf->ol_flags = 0;
+			mbuf->ol_flags |= PKT_RX_IP_CKSUM_GOOD;
+			mbuf->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
+			if (unlikely(error_status == AXGBE_L3_CSUM_ERR)) {
+				mbuf->ol_flags &= ~PKT_RX_IP_CKSUM_GOOD;
+				mbuf->ol_flags |= PKT_RX_IP_CKSUM_BAD;
+				mbuf->ol_flags &= ~PKT_RX_L4_CKSUM_GOOD;
+				mbuf->ol_flags |= PKT_RX_L4_CKSUM_UNKNOWN;
+			} else if (
+				unlikely(error_status == AXGBE_L4_CSUM_ERR)) {
+				mbuf->ol_flags &= ~PKT_RX_L4_CKSUM_GOOD;
+				mbuf->ol_flags |= PKT_RX_L4_CKSUM_BAD;
+			}
+		}
+		rte_prefetch1(rte_pktmbuf_mtod(mbuf, void *));
+		/* Get the RSS hash */
+		if (AXGMAC_GET_BITS_LE(desc->write.desc3, RX_NORMAL_DESC3, RSV))
+			mbuf->hash.rss = rte_le_to_cpu_32(desc->write.desc1);
+		pkt_len = AXGMAC_GET_BITS_LE(desc->write.desc3, RX_NORMAL_DESC3,
+					     PL) - rxq->crc_len;
+		/* Mbuf populate */
+		mbuf->next = NULL;
+		mbuf->data_off = RTE_PKTMBUF_HEADROOM;
+		mbuf->nb_segs = 1;
+		mbuf->port = rxq->port_id;
+		mbuf->pkt_len = pkt_len;
+		mbuf->data_len = pkt_len;
+		rxq->bytes += pkt_len;
+		rx_pkts[nb_rx++] = mbuf;
+err_set:
+		rxq->cur++;
+		rxq->sw_ring[idx++] = tmbuf;
+		desc->read.baddr =
+			rte_cpu_to_le_64(rte_mbuf_data_iova_default(tmbuf));
+		memset((void *)(&desc->read.desc2), 0, 8);
+		AXGMAC_SET_BITS_LE(desc->read.desc3, RX_NORMAL_DESC3, OWN, 1);
+		rxq->dirty++;
+	}
+	rxq->pkts += nb_rx;
+	if (rxq->dirty != old_dirty) {
+		rte_wmb();
+		idx = AXGBE_GET_DESC_IDX(rxq, rxq->dirty - 1);
+		AXGMAC_DMA_IOWRITE(rxq, DMA_CH_RDTR_LO,
+				   low32_value(rxq->ring_phys_addr +
+				   (idx * sizeof(union axgbe_rx_desc))));
+	}
+
+	return nb_rx;
+}
+
+/* Tx Apis */
+static void axgbe_tx_queue_release(struct axgbe_tx_queue *tx_queue)
+{
+	uint16_t i;
+	struct rte_mbuf **sw_ring;
+
+	if (tx_queue) {
+		sw_ring = tx_queue->sw_ring;
+		if (sw_ring) {
+			for (i = 0; i < tx_queue->nb_desc; i++) {
+				if (sw_ring[i])
+					rte_pktmbuf_free(sw_ring[i]);
+			}
+			rte_free(sw_ring);
+		}
+		rte_free(tx_queue);
+	}
+}
+
+void axgbe_dev_tx_queue_release(void *txq)
+{
+	axgbe_tx_queue_release(txq);
+}
+
+int axgbe_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
+			     uint16_t nb_desc, unsigned int socket_id,
+			     const struct rte_eth_txconf *tx_conf)
+{
+	PMD_INIT_FUNC_TRACE();
+	uint32_t tx_desc;
+	struct axgbe_port *pdata;
+	struct axgbe_tx_queue *txq;
+	unsigned int tsize;
+	const struct rte_memzone *tz;
+
+	tx_desc = nb_desc;
+	pdata = (struct axgbe_port *)dev->data->dev_private;
+
+	/*
+	 * validate tx descriptors count
+	 * should be power of 2 and less than h/w supported
+	 */
+	if ((!rte_is_power_of_2(tx_desc)) ||
+	    tx_desc > pdata->tx_desc_count ||
+	    tx_desc < AXGBE_MIN_RING_DESC)
+		return -EINVAL;
+
+	/* First allocate the tx queue data structure */
+	txq = rte_zmalloc("ethdev TX queue", sizeof(struct axgbe_tx_queue),
+			  RTE_CACHE_LINE_SIZE);
+	if (!txq)
+		return -ENOMEM;
+	txq->pdata = pdata;
+
+	txq->nb_desc = tx_desc;
+	txq->free_thresh = tx_conf->tx_free_thresh ?
+		tx_conf->tx_free_thresh : AXGBE_TX_FREE_THRESH;
+	if (txq->free_thresh > txq->nb_desc)
+		txq->free_thresh = (txq->nb_desc >> 1);
+	txq->free_batch_cnt = txq->free_thresh;
+
+	/* In vector_tx path threshold should be multiple of queue_size*/
+	if (txq->nb_desc % txq->free_thresh != 0)
+		txq->vector_disable = 1;
+
+	if (tx_conf->offloads != 0)
+		txq->vector_disable = 1;
+
+	/* Allocate TX ring hardware descriptors */
+	tsize = txq->nb_desc * sizeof(struct axgbe_tx_desc);
+	tz = rte_eth_dma_zone_reserve(dev, "tx_ring", queue_idx,
+				      tsize, AXGBE_DESC_ALIGN, socket_id);
+	if (!tz) {
+		axgbe_tx_queue_release(txq);
+		return -ENOMEM;
+	}
+	memset(tz->addr, 0, tsize);
+	txq->ring_phys_addr = (uint64_t)tz->phys_addr;
+	txq->desc = tz->addr;
+	txq->queue_id = queue_idx;
+	txq->port_id = dev->data->port_id;
+	txq->dma_regs = (void *)((uint8_t *)pdata->xgmac_regs + DMA_CH_BASE +
+		(DMA_CH_INC * txq->queue_id));
+	txq->dma_tail_reg = (volatile uint32_t *)((uint8_t *)txq->dma_regs +
+						  DMA_CH_TDTR_LO);
+	txq->cur = 0;
+	txq->dirty = 0;
+	txq->nb_desc_free = txq->nb_desc;
+	/* Allocate software ring */
+	tsize = txq->nb_desc * sizeof(struct rte_mbuf *);
+	txq->sw_ring = rte_zmalloc("tx_sw_ring", tsize,
+				   RTE_CACHE_LINE_SIZE);
+	if (!txq->sw_ring) {
+		axgbe_tx_queue_release(txq);
+		return -ENOMEM;
+	}
+	dev->data->tx_queues[queue_idx] = txq;
+	if (!pdata->tx_queues)
+		pdata->tx_queues = dev->data->tx_queues;
+
+	if (txq->vector_disable)
+		dev->tx_pkt_burst = &axgbe_xmit_pkts;
+	else
+#ifdef RTE_ARCH_X86
+		dev->tx_pkt_burst = &axgbe_xmit_pkts_vec;
+#else
+		dev->tx_pkt_burst = &axgbe_xmit_pkts;
+#endif
+
+	return 0;
+}
+
+static void axgbe_txq_prepare_tx_stop(struct axgbe_port *pdata,
+				      unsigned int queue)
+{
+	unsigned int tx_status;
+	unsigned long tx_timeout;
+
+	/* The Tx engine cannot be stopped if it is actively processing
+	 * packets. Wait for the Tx queue to empty the Tx fifo.  Don't
+	 * wait forever though...
+	 */
+	tx_timeout = rte_get_timer_cycles() + (AXGBE_DMA_STOP_TIMEOUT *
+					       rte_get_timer_hz());
+	while (time_before(rte_get_timer_cycles(), tx_timeout)) {
+		tx_status = AXGMAC_MTL_IOREAD(pdata, queue, MTL_Q_TQDR);
+		if ((AXGMAC_GET_BITS(tx_status, MTL_Q_TQDR, TRCSTS) != 1) &&
+		    (AXGMAC_GET_BITS(tx_status, MTL_Q_TQDR, TXQSTS) == 0))
+			break;
+
+		rte_delay_us(900);
+	}
+
+	if (!time_before(rte_get_timer_cycles(), tx_timeout))
+		PMD_DRV_LOG(ERR,
+			    "timed out waiting for Tx queue %u to empty\n",
+			    queue);
+}
+
+static void axgbe_prepare_tx_stop(struct axgbe_port *pdata,
+				  unsigned int queue)
+{
+	unsigned int tx_dsr, tx_pos, tx_qidx;
+	unsigned int tx_status;
+	unsigned long tx_timeout;
+
+	if (AXGMAC_GET_BITS(pdata->hw_feat.version, MAC_VR, SNPSVER) > 0x20)
+		return axgbe_txq_prepare_tx_stop(pdata, queue);
+
+	/* Calculate the status register to read and the position within */
+	if (queue < DMA_DSRX_FIRST_QUEUE) {
+		tx_dsr = DMA_DSR0;
+		tx_pos = (queue * DMA_DSR_Q_WIDTH) + DMA_DSR0_TPS_START;
+	} else {
+		tx_qidx = queue - DMA_DSRX_FIRST_QUEUE;
+
+		tx_dsr = DMA_DSR1 + ((tx_qidx / DMA_DSRX_QPR) * DMA_DSRX_INC);
+		tx_pos = ((tx_qidx % DMA_DSRX_QPR) * DMA_DSR_Q_WIDTH) +
+			DMA_DSRX_TPS_START;
+	}
+
+	/* The Tx engine cannot be stopped if it is actively processing
+	 * descriptors. Wait for the Tx engine to enter the stopped or
+	 * suspended state.  Don't wait forever though...
+	 */
+	tx_timeout = rte_get_timer_cycles() + (AXGBE_DMA_STOP_TIMEOUT *
+					       rte_get_timer_hz());
+	while (time_before(rte_get_timer_cycles(), tx_timeout)) {
+		tx_status = AXGMAC_IOREAD(pdata, tx_dsr);
+		tx_status = GET_BITS(tx_status, tx_pos, DMA_DSR_TPS_WIDTH);
+		if ((tx_status == DMA_TPS_STOPPED) ||
+		    (tx_status == DMA_TPS_SUSPENDED))
+			break;
+
+		rte_delay_us(900);
+	}
+
+	if (!time_before(rte_get_timer_cycles(), tx_timeout))
+		PMD_DRV_LOG(ERR,
+			    "timed out waiting for Tx DMA channel %u to stop\n",
+			    queue);
+}
+
+void axgbe_dev_disable_tx(struct rte_eth_dev *dev)
+{
+	struct axgbe_tx_queue *txq;
+	struct axgbe_port *pdata = dev->data->dev_private;
+	unsigned int i;
+
+	/* Prepare for stopping DMA channel */
+	for (i = 0; i < pdata->tx_q_count; i++) {
+		txq = dev->data->tx_queues[i];
+		axgbe_prepare_tx_stop(pdata, i);
+	}
+	/* Disable MAC Tx */
+	AXGMAC_IOWRITE_BITS(pdata, MAC_TCR, TE, 0);
+	/* Disable each Tx queue*/
+	for (i = 0; i < pdata->tx_q_count; i++)
+		AXGMAC_MTL_IOWRITE_BITS(pdata, i, MTL_Q_TQOMR, TXQEN,
+					0);
+	/* Disable each  Tx DMA channel */
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		txq = dev->data->tx_queues[i];
+		AXGMAC_DMA_IOWRITE_BITS(txq, DMA_CH_TCR, ST, 0);
+	}
+}
+
+void axgbe_dev_enable_tx(struct rte_eth_dev *dev)
+{
+	struct axgbe_tx_queue *txq;
+	struct axgbe_port *pdata = dev->data->dev_private;
+	unsigned int i;
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		txq = dev->data->tx_queues[i];
+		/* Enable Tx DMA channel */
+		AXGMAC_DMA_IOWRITE_BITS(txq, DMA_CH_TCR, ST, 1);
+	}
+	/* Enable Tx queue*/
+	for (i = 0; i < pdata->tx_q_count; i++)
+		AXGMAC_MTL_IOWRITE_BITS(pdata, i, MTL_Q_TQOMR, TXQEN,
+					MTL_Q_ENABLED);
+	/* Enable MAC Tx */
+	AXGMAC_IOWRITE_BITS(pdata, MAC_TCR, TE, 1);
+}
+
+/* Free Tx conformed mbufs */
+static void axgbe_xmit_cleanup(struct axgbe_tx_queue *txq)
+{
+	volatile struct axgbe_tx_desc *desc;
+	uint16_t idx;
+
+	idx = AXGBE_GET_DESC_IDX(txq, txq->dirty);
+	while (txq->cur != txq->dirty) {
+		if (unlikely(idx == txq->nb_desc))
+			idx = 0;
+		desc = &txq->desc[idx];
+		/* Check for ownership */
+		if (AXGMAC_GET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, OWN))
+			return;
+		memset((void *)&desc->desc2, 0, 8);
+		/* Free mbuf */
+		rte_pktmbuf_free(txq->sw_ring[idx]);
+		txq->sw_ring[idx++] = NULL;
+		txq->dirty++;
+	}
+}
+
+/* Tx Descriptor formation
+ * Considering each mbuf requires one desc
+ * mbuf is linear
+ */
+static int axgbe_xmit_hw(struct axgbe_tx_queue *txq,
+			 struct rte_mbuf *mbuf)
+{
+	volatile struct axgbe_tx_desc *desc;
+	uint16_t idx;
+	uint64_t mask;
+
+	idx = AXGBE_GET_DESC_IDX(txq, txq->cur);
+	desc = &txq->desc[idx];
+
+	/* Update buffer address  and length */
+	desc->baddr = rte_mbuf_data_iova(mbuf);
+	AXGMAC_SET_BITS_LE(desc->desc2, TX_NORMAL_DESC2, HL_B1L,
+			   mbuf->pkt_len);
+	/* Total msg length to transmit */
+	AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, FL,
+			   mbuf->pkt_len);
+	/* Mark it as First and Last Descriptor */
+	AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, FD, 1);
+	AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, LD, 1);
+	/* Mark it as a NORMAL descriptor */
+	AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, CTXT, 0);
+	/* configure h/w Offload */
+	mask = mbuf->ol_flags & PKT_TX_L4_MASK;
+	if ((mask == PKT_TX_TCP_CKSUM) || (mask == PKT_TX_UDP_CKSUM))
+		AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, CIC, 0x3);
+	else if (mbuf->ol_flags & PKT_TX_IP_CKSUM)
+		AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, CIC, 0x1);
+	rte_wmb();
+
+	/* Set OWN bit */
+	AXGMAC_SET_BITS_LE(desc->desc3, TX_NORMAL_DESC3, OWN, 1);
+	rte_wmb();
+
+	/* Save mbuf */
+	txq->sw_ring[idx] = mbuf;
+	/* Update current index*/
+	txq->cur++;
+	/* Update stats */
+	txq->bytes += mbuf->pkt_len;
+
+	return 0;
+}
+
+/* Eal supported tx wrapper*/
+uint16_t
+axgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+		uint16_t nb_pkts)
+{
+	PMD_INIT_FUNC_TRACE();
+
+	if (unlikely(nb_pkts == 0))
+		return nb_pkts;
+
+	struct axgbe_tx_queue *txq;
+	uint16_t nb_desc_free;
+	uint16_t nb_pkt_sent = 0;
+	uint16_t idx;
+	uint32_t tail_addr;
+	struct rte_mbuf *mbuf;
+
+	txq  = (struct axgbe_tx_queue *)tx_queue;
+	nb_desc_free = txq->nb_desc - (txq->cur - txq->dirty);
+
+	if (unlikely(nb_desc_free <= txq->free_thresh)) {
+		axgbe_xmit_cleanup(txq);
+		nb_desc_free = txq->nb_desc - (txq->cur - txq->dirty);
+		if (unlikely(nb_desc_free == 0))
+			return 0;
+	}
+	nb_pkts = RTE_MIN(nb_desc_free, nb_pkts);
+	while (nb_pkts--) {
+		mbuf = *tx_pkts++;
+		if (axgbe_xmit_hw(txq, mbuf))
+			goto out;
+		nb_pkt_sent++;
+	}
+out:
+	/* Sync read and write */
+	rte_mb();
+	idx = AXGBE_GET_DESC_IDX(txq, txq->cur);
+	tail_addr = low32_value(txq->ring_phys_addr +
+				idx * sizeof(struct axgbe_tx_desc));
+	/* Update tail reg with next immediate address to kick Tx DMA channel*/
+	AXGMAC_DMA_IOWRITE(txq, DMA_CH_TDTR_LO, tail_addr);
+	txq->pkts += nb_pkt_sent;
+	return nb_pkt_sent;
+}
+
+void axgbe_dev_clear_queues(struct rte_eth_dev *dev)
+{
+	PMD_INIT_FUNC_TRACE();
+	uint8_t i;
+	struct axgbe_rx_queue *rxq;
+	struct axgbe_tx_queue *txq;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+
+		if (rxq) {
+			axgbe_rx_queue_release(rxq);
+			dev->data->rx_queues[i] = NULL;
+		}
+	}
+
+	for (i = 0; i < dev->data->nb_tx_queues; i++) {
+		txq = dev->data->tx_queues[i];
+
+		if (txq) {
+			axgbe_tx_queue_release(txq);
+			dev->data->tx_queues[i] = NULL;
+		}
+	}
+}