Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2537 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
new file mode 100644
index 000000000..8c5f6096b
--- /dev/null
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -0,0 +1,2537 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2013 - 2018 Intel Corporation. */
+
+#include <linux/prefetch.h>
+
+#include "iavf.h"
+#include "iavf_trace.h"
+#include "iavf_prototype.h"
+
+static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size,
+				u32 td_tag)
+{
+	return cpu_to_le64(IAVF_TX_DESC_DTYPE_DATA |
+			   ((u64)td_cmd  << IAVF_TXD_QW1_CMD_SHIFT) |
+			   ((u64)td_offset << IAVF_TXD_QW1_OFFSET_SHIFT) |
+			   ((u64)size  << IAVF_TXD_QW1_TX_BUF_SZ_SHIFT) |
+			   ((u64)td_tag  << IAVF_TXD_QW1_L2TAG1_SHIFT));
+}
+
+#define IAVF_TXD_CMD (IAVF_TX_DESC_CMD_EOP | IAVF_TX_DESC_CMD_RS)
+
+/**
+ * iavf_unmap_and_free_tx_resource - Release a Tx buffer
+ * @ring:      the ring that owns the buffer
+ * @tx_buffer: the buffer to free
+ **/
+static void iavf_unmap_and_free_tx_resource(struct iavf_ring *ring,
+					    struct iavf_tx_buffer *tx_buffer)
+{
+	if (tx_buffer->skb) {
+		if (tx_buffer->tx_flags & IAVF_TX_FLAGS_FD_SB)
+			kfree(tx_buffer->raw_buf);
+		else
+			dev_kfree_skb_any(tx_buffer->skb);
+		if (dma_unmap_len(tx_buffer, len))
+			dma_unmap_single(ring->dev,
+					 dma_unmap_addr(tx_buffer, dma),
+					 dma_unmap_len(tx_buffer, len),
+					 DMA_TO_DEVICE);
+	} else if (dma_unmap_len(tx_buffer, len)) {
+		dma_unmap_page(ring->dev,
+			       dma_unmap_addr(tx_buffer, dma),
+			       dma_unmap_len(tx_buffer, len),
+			       DMA_TO_DEVICE);
+	}
+
+	tx_buffer->next_to_watch = NULL;
+	tx_buffer->skb = NULL;
+	dma_unmap_len_set(tx_buffer, len, 0);
+	/* tx_buffer must be completely set up in the transmit path */
+}
+
+/**
+ * iavf_clean_tx_ring - Free any empty Tx buffers
+ * @tx_ring: ring to be cleaned
+ **/
+static void iavf_clean_tx_ring(struct iavf_ring *tx_ring)
+{
+	unsigned long bi_size;
+	u16 i;
+
+	/* ring already cleared, nothing to do */
+	if (!tx_ring->tx_bi)
+		return;
+
+	/* Free all the Tx ring sk_buffs */
+	for (i = 0; i < tx_ring->count; i++)
+		iavf_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]);
+
+	bi_size = sizeof(struct iavf_tx_buffer) * tx_ring->count;
+	memset(tx_ring->tx_bi, 0, bi_size);
+
+	/* Zero out the descriptor ring */
+	memset(tx_ring->desc, 0, tx_ring->size);
+
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+
+	if (!tx_ring->netdev)
+		return;
+
+	/* cleanup Tx queue statistics */
+	netdev_tx_reset_queue(txring_txq(tx_ring));
+}
+
+/**
+ * iavf_free_tx_resources - Free Tx resources per queue
+ * @tx_ring: Tx descriptor ring for a specific queue
+ *
+ * Free all transmit software resources
+ **/
+void iavf_free_tx_resources(struct iavf_ring *tx_ring)
+{
+	iavf_clean_tx_ring(tx_ring);
+	kfree(tx_ring->tx_bi);
+	tx_ring->tx_bi = NULL;
+
+	if (tx_ring->desc) {
+		dma_free_coherent(tx_ring->dev, tx_ring->size,
+				  tx_ring->desc, tx_ring->dma);
+		tx_ring->desc = NULL;
+	}
+}
+
+/**
+ * iavf_get_tx_pending - how many Tx descriptors not processed
+ * @ring: the ring of descriptors
+ * @in_sw: is tx_pending being checked in SW or HW
+ *
+ * Since there is no access to the ring head register
+ * in XL710, we need to use our local copies
+ **/
+static u32 iavf_get_tx_pending(struct iavf_ring *ring, bool in_sw)
+{
+	u32 head, tail;
+
+	/* underlying hardware might not allow access and/or always return
+	 * 0 for the head/tail registers so just use the cached values
+	 */
+	head = ring->next_to_clean;
+	tail = ring->next_to_use;
+
+	if (head != tail)
+		return (head < tail) ?
+			tail - head : (tail + ring->count - head);
+
+	return 0;
+}
+
+/**
+ * iavf_force_wb - Issue SW Interrupt so HW does a wb
+ * @vsi: the VSI we care about
+ * @q_vector: the vector on which to force writeback
+ **/
+static void iavf_force_wb(struct iavf_vsi *vsi, struct iavf_q_vector *q_vector)
+{
+	u32 val = IAVF_VFINT_DYN_CTLN1_INTENA_MASK |
+		  IAVF_VFINT_DYN_CTLN1_ITR_INDX_MASK | /* set noitr */
+		  IAVF_VFINT_DYN_CTLN1_SWINT_TRIG_MASK |
+		  IAVF_VFINT_DYN_CTLN1_SW_ITR_INDX_ENA_MASK
+		  /* allow 00 to be written to the index */;
+
+	wr32(&vsi->back->hw,
+	     IAVF_VFINT_DYN_CTLN1(q_vector->reg_idx),
+	     val);
+}
+
+/**
+ * iavf_detect_recover_hung - Function to detect and recover hung_queues
+ * @vsi:  pointer to vsi struct with tx queues
+ *
+ * VSI has netdev and netdev has TX queues. This function is to check each of
+ * those TX queues if they are hung, trigger recovery by issuing SW interrupt.
+ **/
+void iavf_detect_recover_hung(struct iavf_vsi *vsi)
+{
+	struct iavf_ring *tx_ring = NULL;
+	struct net_device *netdev;
+	unsigned int i;
+	int packets;
+
+	if (!vsi)
+		return;
+
+	if (test_bit(__IAVF_VSI_DOWN, vsi->state))
+		return;
+
+	netdev = vsi->netdev;
+	if (!netdev)
+		return;
+
+	if (!netif_carrier_ok(netdev))
+		return;
+
+	for (i = 0; i < vsi->back->num_active_queues; i++) {
+		tx_ring = &vsi->back->tx_rings[i];
+		if (tx_ring && tx_ring->desc) {
+			/* If packet counter has not changed the queue is
+			 * likely stalled, so force an interrupt for this
+			 * queue.
+			 *
+			 * prev_pkt_ctr would be negative if there was no
+			 * pending work.
+			 */
+			packets = tx_ring->stats.packets & INT_MAX;
+			if (tx_ring->tx_stats.prev_pkt_ctr == packets) {
+				iavf_force_wb(vsi, tx_ring->q_vector);
+				continue;
+			}
+
+			/* Memory barrier between read of packet count and call
+			 * to iavf_get_tx_pending()
+			 */
+			smp_rmb();
+			tx_ring->tx_stats.prev_pkt_ctr =
+			  iavf_get_tx_pending(tx_ring, true) ? packets : -1;
+		}
+	}
+}
+
+#define WB_STRIDE 4
+
+/**
+ * iavf_clean_tx_irq - Reclaim resources after transmit completes
+ * @vsi: the VSI we care about
+ * @tx_ring: Tx ring to clean
+ * @napi_budget: Used to determine if we are in netpoll
+ *
+ * Returns true if there's any budget left (e.g. the clean is finished)
+ **/
+static bool iavf_clean_tx_irq(struct iavf_vsi *vsi,
+			      struct iavf_ring *tx_ring, int napi_budget)
+{
+	int i = tx_ring->next_to_clean;
+	struct iavf_tx_buffer *tx_buf;
+	struct iavf_tx_desc *tx_desc;
+	unsigned int total_bytes = 0, total_packets = 0;
+	unsigned int budget = IAVF_DEFAULT_IRQ_WORK;
+
+	tx_buf = &tx_ring->tx_bi[i];
+	tx_desc = IAVF_TX_DESC(tx_ring, i);
+	i -= tx_ring->count;
+
+	do {
+		struct iavf_tx_desc *eop_desc = tx_buf->next_to_watch;
+
+		/* if next_to_watch is not set then there is no work pending */
+		if (!eop_desc)
+			break;
+
+		/* prevent any other reads prior to eop_desc */
+		smp_rmb();
+
+		iavf_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
+		/* if the descriptor isn't done, no work yet to do */
+		if (!(eop_desc->cmd_type_offset_bsz &
+		      cpu_to_le64(IAVF_TX_DESC_DTYPE_DESC_DONE)))
+			break;
+
+		/* clear next_to_watch to prevent false hangs */
+		tx_buf->next_to_watch = NULL;
+
+		/* update the statistics for this packet */
+		total_bytes += tx_buf->bytecount;
+		total_packets += tx_buf->gso_segs;
+
+		/* free the skb */
+		napi_consume_skb(tx_buf->skb, napi_budget);
+
+		/* unmap skb header data */
+		dma_unmap_single(tx_ring->dev,
+				 dma_unmap_addr(tx_buf, dma),
+				 dma_unmap_len(tx_buf, len),
+				 DMA_TO_DEVICE);
+
+		/* clear tx_buffer data */
+		tx_buf->skb = NULL;
+		dma_unmap_len_set(tx_buf, len, 0);
+
+		/* unmap remaining buffers */
+		while (tx_desc != eop_desc) {
+			iavf_trace(clean_tx_irq_unmap,
+				   tx_ring, tx_desc, tx_buf);
+
+			tx_buf++;
+			tx_desc++;
+			i++;
+			if (unlikely(!i)) {
+				i -= tx_ring->count;
+				tx_buf = tx_ring->tx_bi;
+				tx_desc = IAVF_TX_DESC(tx_ring, 0);
+			}
+
+			/* unmap any remaining paged data */
+			if (dma_unmap_len(tx_buf, len)) {
+				dma_unmap_page(tx_ring->dev,
+					       dma_unmap_addr(tx_buf, dma),
+					       dma_unmap_len(tx_buf, len),
+					       DMA_TO_DEVICE);
+				dma_unmap_len_set(tx_buf, len, 0);
+			}
+		}
+
+		/* move us one more past the eop_desc for start of next pkt */
+		tx_buf++;
+		tx_desc++;
+		i++;
+		if (unlikely(!i)) {
+			i -= tx_ring->count;
+			tx_buf = tx_ring->tx_bi;
+			tx_desc = IAVF_TX_DESC(tx_ring, 0);
+		}
+
+		prefetch(tx_desc);
+
+		/* update budget accounting */
+		budget--;
+	} while (likely(budget));
+
+	i += tx_ring->count;
+	tx_ring->next_to_clean = i;
+	u64_stats_update_begin(&tx_ring->syncp);
+	tx_ring->stats.bytes += total_bytes;
+	tx_ring->stats.packets += total_packets;
+	u64_stats_update_end(&tx_ring->syncp);
+	tx_ring->q_vector->tx.total_bytes += total_bytes;
+	tx_ring->q_vector->tx.total_packets += total_packets;
+
+	if (tx_ring->flags & IAVF_TXR_FLAGS_WB_ON_ITR) {
+		/* check to see if there are < 4 descriptors
+		 * waiting to be written back, then kick the hardware to force
+		 * them to be written back in case we stay in NAPI.
+		 * In this mode on X722 we do not enable Interrupt.
+		 */
+		unsigned int j = iavf_get_tx_pending(tx_ring, false);
+
+		if (budget &&
+		    ((j / WB_STRIDE) == 0) && (j > 0) &&
+		    !test_bit(__IAVF_VSI_DOWN, vsi->state) &&
+		    (IAVF_DESC_UNUSED(tx_ring) != tx_ring->count))
+			tx_ring->arm_wb = true;
+	}
+
+	/* notify netdev of completed buffers */
+	netdev_tx_completed_queue(txring_txq(tx_ring),
+				  total_packets, total_bytes);
+
+#define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2))
+	if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
+		     (IAVF_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
+		/* Make sure that anybody stopping the queue after this
+		 * sees the new next_to_clean.
+		 */
+		smp_mb();
+		if (__netif_subqueue_stopped(tx_ring->netdev,
+					     tx_ring->queue_index) &&
+		   !test_bit(__IAVF_VSI_DOWN, vsi->state)) {
+			netif_wake_subqueue(tx_ring->netdev,
+					    tx_ring->queue_index);
+			++tx_ring->tx_stats.restart_queue;
+		}
+	}
+
+	return !!budget;
+}
+
+/**
+ * iavf_enable_wb_on_itr - Arm hardware to do a wb, interrupts are not enabled
+ * @vsi: the VSI we care about
+ * @q_vector: the vector on which to enable writeback
+ *
+ **/
+static void iavf_enable_wb_on_itr(struct iavf_vsi *vsi,
+				  struct iavf_q_vector *q_vector)
+{
+	u16 flags = q_vector->tx.ring[0].flags;
+	u32 val;
+
+	if (!(flags & IAVF_TXR_FLAGS_WB_ON_ITR))
+		return;
+
+	if (q_vector->arm_wb_state)
+		return;
+
+	val = IAVF_VFINT_DYN_CTLN1_WB_ON_ITR_MASK |
+	      IAVF_VFINT_DYN_CTLN1_ITR_INDX_MASK; /* set noitr */
+
+	wr32(&vsi->back->hw,
+	     IAVF_VFINT_DYN_CTLN1(q_vector->reg_idx), val);
+	q_vector->arm_wb_state = true;
+}
+
+static inline bool iavf_container_is_rx(struct iavf_q_vector *q_vector,
+					struct iavf_ring_container *rc)
+{
+	return &q_vector->rx == rc;
+}
+
+#define IAVF_AIM_MULTIPLIER_100G	2560
+#define IAVF_AIM_MULTIPLIER_50G		1280
+#define IAVF_AIM_MULTIPLIER_40G		1024
+#define IAVF_AIM_MULTIPLIER_20G		512
+#define IAVF_AIM_MULTIPLIER_10G		256
+#define IAVF_AIM_MULTIPLIER_1G		32
+
+static unsigned int iavf_mbps_itr_multiplier(u32 speed_mbps)
+{
+	switch (speed_mbps) {
+	case SPEED_100000:
+		return IAVF_AIM_MULTIPLIER_100G;
+	case SPEED_50000:
+		return IAVF_AIM_MULTIPLIER_50G;
+	case SPEED_40000:
+		return IAVF_AIM_MULTIPLIER_40G;
+	case SPEED_25000:
+	case SPEED_20000:
+		return IAVF_AIM_MULTIPLIER_20G;
+	case SPEED_10000:
+	default:
+		return IAVF_AIM_MULTIPLIER_10G;
+	case SPEED_1000:
+	case SPEED_100:
+		return IAVF_AIM_MULTIPLIER_1G;
+	}
+}
+
+static unsigned int
+iavf_virtchnl_itr_multiplier(enum virtchnl_link_speed speed_virtchnl)
+{
+	switch (speed_virtchnl) {
+	case VIRTCHNL_LINK_SPEED_40GB:
+		return IAVF_AIM_MULTIPLIER_40G;
+	case VIRTCHNL_LINK_SPEED_25GB:
+	case VIRTCHNL_LINK_SPEED_20GB:
+		return IAVF_AIM_MULTIPLIER_20G;
+	case VIRTCHNL_LINK_SPEED_10GB:
+	default:
+		return IAVF_AIM_MULTIPLIER_10G;
+	case VIRTCHNL_LINK_SPEED_1GB:
+	case VIRTCHNL_LINK_SPEED_100MB:
+		return IAVF_AIM_MULTIPLIER_1G;
+	}
+}
+
+static unsigned int iavf_itr_divisor(struct iavf_adapter *adapter)
+{
+	if (ADV_LINK_SUPPORT(adapter))
+		return IAVF_ITR_ADAPTIVE_MIN_INC *
+			iavf_mbps_itr_multiplier(adapter->link_speed_mbps);
+	else
+		return IAVF_ITR_ADAPTIVE_MIN_INC *
+			iavf_virtchnl_itr_multiplier(adapter->link_speed);
+}
+
+/**
+ * iavf_update_itr - update the dynamic ITR value based on statistics
+ * @q_vector: structure containing interrupt and ring information
+ * @rc: structure containing ring performance data
+ *
+ * Stores a new ITR value based on packets and byte
+ * counts during the last interrupt.  The advantage of per interrupt
+ * computation is faster updates and more accurate ITR for the current
+ * traffic pattern.  Constants in this function were computed
+ * based on theoretical maximum wire speed and thresholds were set based
+ * on testing data as well as attempting to minimize response time
+ * while increasing bulk throughput.
+ **/
+static void iavf_update_itr(struct iavf_q_vector *q_vector,
+			    struct iavf_ring_container *rc)
+{
+	unsigned int avg_wire_size, packets, bytes, itr;
+	unsigned long next_update = jiffies;
+
+	/* If we don't have any rings just leave ourselves set for maximum
+	 * possible latency so we take ourselves out of the equation.
+	 */
+	if (!rc->ring || !ITR_IS_DYNAMIC(rc->ring->itr_setting))
+		return;
+
+	/* For Rx we want to push the delay up and default to low latency.
+	 * for Tx we want to pull the delay down and default to high latency.
+	 */
+	itr = iavf_container_is_rx(q_vector, rc) ?
+	      IAVF_ITR_ADAPTIVE_MIN_USECS | IAVF_ITR_ADAPTIVE_LATENCY :
+	      IAVF_ITR_ADAPTIVE_MAX_USECS | IAVF_ITR_ADAPTIVE_LATENCY;
+
+	/* If we didn't update within up to 1 - 2 jiffies we can assume
+	 * that either packets are coming in so slow there hasn't been
+	 * any work, or that there is so much work that NAPI is dealing
+	 * with interrupt moderation and we don't need to do anything.
+	 */
+	if (time_after(next_update, rc->next_update))
+		goto clear_counts;
+
+	/* If itr_countdown is set it means we programmed an ITR within
+	 * the last 4 interrupt cycles. This has a side effect of us
+	 * potentially firing an early interrupt. In order to work around
+	 * this we need to throw out any data received for a few
+	 * interrupts following the update.
+	 */
+	if (q_vector->itr_countdown) {
+		itr = rc->target_itr;
+		goto clear_counts;
+	}
+
+	packets = rc->total_packets;
+	bytes = rc->total_bytes;
+
+	if (iavf_container_is_rx(q_vector, rc)) {
+		/* If Rx there are 1 to 4 packets and bytes are less than
+		 * 9000 assume insufficient data to use bulk rate limiting
+		 * approach unless Tx is already in bulk rate limiting. We
+		 * are likely latency driven.
+		 */
+		if (packets && packets < 4 && bytes < 9000 &&
+		    (q_vector->tx.target_itr & IAVF_ITR_ADAPTIVE_LATENCY)) {
+			itr = IAVF_ITR_ADAPTIVE_LATENCY;
+			goto adjust_by_size;
+		}
+	} else if (packets < 4) {
+		/* If we have Tx and Rx ITR maxed and Tx ITR is running in
+		 * bulk mode and we are receiving 4 or fewer packets just
+		 * reset the ITR_ADAPTIVE_LATENCY bit for latency mode so
+		 * that the Rx can relax.
+		 */
+		if (rc->target_itr == IAVF_ITR_ADAPTIVE_MAX_USECS &&
+		    (q_vector->rx.target_itr & IAVF_ITR_MASK) ==
+		     IAVF_ITR_ADAPTIVE_MAX_USECS)
+			goto clear_counts;
+	} else if (packets > 32) {
+		/* If we have processed over 32 packets in a single interrupt
+		 * for Tx assume we need to switch over to "bulk" mode.
+		 */
+		rc->target_itr &= ~IAVF_ITR_ADAPTIVE_LATENCY;
+	}
+
+	/* We have no packets to actually measure against. This means
+	 * either one of the other queues on this vector is active or
+	 * we are a Tx queue doing TSO with too high of an interrupt rate.
+	 *
+	 * Between 4 and 56 we can assume that our current interrupt delay
+	 * is only slightly too low. As such we should increase it by a small
+	 * fixed amount.
+	 */
+	if (packets < 56) {
+		itr = rc->target_itr + IAVF_ITR_ADAPTIVE_MIN_INC;
+		if ((itr & IAVF_ITR_MASK) > IAVF_ITR_ADAPTIVE_MAX_USECS) {
+			itr &= IAVF_ITR_ADAPTIVE_LATENCY;
+			itr += IAVF_ITR_ADAPTIVE_MAX_USECS;
+		}
+		goto clear_counts;
+	}
+
+	if (packets <= 256) {
+		itr = min(q_vector->tx.current_itr, q_vector->rx.current_itr);
+		itr &= IAVF_ITR_MASK;
+
+		/* Between 56 and 112 is our "goldilocks" zone where we are
+		 * working out "just right". Just report that our current
+		 * ITR is good for us.
+		 */
+		if (packets <= 112)
+			goto clear_counts;
+
+		/* If packet count is 128 or greater we are likely looking
+		 * at a slight overrun of the delay we want. Try halving
+		 * our delay to see if that will cut the number of packets
+		 * in half per interrupt.
+		 */
+		itr /= 2;
+		itr &= IAVF_ITR_MASK;
+		if (itr < IAVF_ITR_ADAPTIVE_MIN_USECS)
+			itr = IAVF_ITR_ADAPTIVE_MIN_USECS;
+
+		goto clear_counts;
+	}
+
+	/* The paths below assume we are dealing with a bulk ITR since
+	 * number of packets is greater than 256. We are just going to have
+	 * to compute a value and try to bring the count under control,
+	 * though for smaller packet sizes there isn't much we can do as
+	 * NAPI polling will likely be kicking in sooner rather than later.
+	 */
+	itr = IAVF_ITR_ADAPTIVE_BULK;
+
+adjust_by_size:
+	/* If packet counts are 256 or greater we can assume we have a gross
+	 * overestimation of what the rate should be. Instead of trying to fine
+	 * tune it just use the formula below to try and dial in an exact value
+	 * give the current packet size of the frame.
+	 */
+	avg_wire_size = bytes / packets;
+
+	/* The following is a crude approximation of:
+	 *  wmem_default / (size + overhead) = desired_pkts_per_int
+	 *  rate / bits_per_byte / (size + ethernet overhead) = pkt_rate
+	 *  (desired_pkt_rate / pkt_rate) * usecs_per_sec = ITR value
+	 *
+	 * Assuming wmem_default is 212992 and overhead is 640 bytes per
+	 * packet, (256 skb, 64 headroom, 320 shared info), we can reduce the
+	 * formula down to
+	 *
+	 *  (170 * (size + 24)) / (size + 640) = ITR
+	 *
+	 * We first do some math on the packet size and then finally bitshift
+	 * by 8 after rounding up. We also have to account for PCIe link speed
+	 * difference as ITR scales based on this.
+	 */
+	if (avg_wire_size <= 60) {
+		/* Start at 250k ints/sec */
+		avg_wire_size = 4096;
+	} else if (avg_wire_size <= 380) {
+		/* 250K ints/sec to 60K ints/sec */
+		avg_wire_size *= 40;
+		avg_wire_size += 1696;
+	} else if (avg_wire_size <= 1084) {
+		/* 60K ints/sec to 36K ints/sec */
+		avg_wire_size *= 15;
+		avg_wire_size += 11452;
+	} else if (avg_wire_size <= 1980) {
+		/* 36K ints/sec to 30K ints/sec */
+		avg_wire_size *= 5;
+		avg_wire_size += 22420;
+	} else {
+		/* plateau at a limit of 30K ints/sec */
+		avg_wire_size = 32256;
+	}
+
+	/* If we are in low latency mode halve our delay which doubles the
+	 * rate to somewhere between 100K to 16K ints/sec
+	 */
+	if (itr & IAVF_ITR_ADAPTIVE_LATENCY)
+		avg_wire_size /= 2;
+
+	/* Resultant value is 256 times larger than it needs to be. This
+	 * gives us room to adjust the value as needed to either increase
+	 * or decrease the value based on link speeds of 10G, 2.5G, 1G, etc.
+	 *
+	 * Use addition as we have already recorded the new latency flag
+	 * for the ITR value.
+	 */
+	itr += DIV_ROUND_UP(avg_wire_size,
+			    iavf_itr_divisor(q_vector->adapter)) *
+		IAVF_ITR_ADAPTIVE_MIN_INC;
+
+	if ((itr & IAVF_ITR_MASK) > IAVF_ITR_ADAPTIVE_MAX_USECS) {
+		itr &= IAVF_ITR_ADAPTIVE_LATENCY;
+		itr += IAVF_ITR_ADAPTIVE_MAX_USECS;
+	}
+
+clear_counts:
+	/* write back value */
+	rc->target_itr = itr;
+
+	/* next update should occur within next jiffy */
+	rc->next_update = next_update + 1;
+
+	rc->total_bytes = 0;
+	rc->total_packets = 0;
+}
+
+/**
+ * iavf_setup_tx_descriptors - Allocate the Tx descriptors
+ * @tx_ring: the tx ring to set up
+ *
+ * Return 0 on success, negative on error
+ **/
+int iavf_setup_tx_descriptors(struct iavf_ring *tx_ring)
+{
+	struct device *dev = tx_ring->dev;
+	int bi_size;
+
+	if (!dev)
+		return -ENOMEM;
+
+	/* warn if we are about to overwrite the pointer */
+	WARN_ON(tx_ring->tx_bi);
+	bi_size = sizeof(struct iavf_tx_buffer) * tx_ring->count;
+	tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL);
+	if (!tx_ring->tx_bi)
+		goto err;
+
+	/* round up to nearest 4K */
+	tx_ring->size = tx_ring->count * sizeof(struct iavf_tx_desc);
+	tx_ring->size = ALIGN(tx_ring->size, 4096);
+	tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
+					   &tx_ring->dma, GFP_KERNEL);
+	if (!tx_ring->desc) {
+		dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n",
+			 tx_ring->size);
+		goto err;
+	}
+
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+	tx_ring->tx_stats.prev_pkt_ctr = -1;
+	return 0;
+
+err:
+	kfree(tx_ring->tx_bi);
+	tx_ring->tx_bi = NULL;
+	return -ENOMEM;
+}
+
+/**
+ * iavf_clean_rx_ring - Free Rx buffers
+ * @rx_ring: ring to be cleaned
+ **/
+static void iavf_clean_rx_ring(struct iavf_ring *rx_ring)
+{
+	unsigned long bi_size;
+	u16 i;
+
+	/* ring already cleared, nothing to do */
+	if (!rx_ring->rx_bi)
+		return;
+
+	if (rx_ring->skb) {
+		dev_kfree_skb(rx_ring->skb);
+		rx_ring->skb = NULL;
+	}
+
+	/* Free all the Rx ring sk_buffs */
+	for (i = 0; i < rx_ring->count; i++) {
+		struct iavf_rx_buffer *rx_bi = &rx_ring->rx_bi[i];
+
+		if (!rx_bi->page)
+			continue;
+
+		/* Invalidate cache lines that may have been written to by
+		 * device so that we avoid corrupting memory.
+		 */
+		dma_sync_single_range_for_cpu(rx_ring->dev,
+					      rx_bi->dma,
+					      rx_bi->page_offset,
+					      rx_ring->rx_buf_len,
+					      DMA_FROM_DEVICE);
+
+		/* free resources associated with mapping */
+		dma_unmap_page_attrs(rx_ring->dev, rx_bi->dma,
+				     iavf_rx_pg_size(rx_ring),
+				     DMA_FROM_DEVICE,
+				     IAVF_RX_DMA_ATTR);
+
+		__page_frag_cache_drain(rx_bi->page, rx_bi->pagecnt_bias);
+
+		rx_bi->page = NULL;
+		rx_bi->page_offset = 0;
+	}
+
+	bi_size = sizeof(struct iavf_rx_buffer) * rx_ring->count;
+	memset(rx_ring->rx_bi, 0, bi_size);
+
+	/* Zero out the descriptor ring */
+	memset(rx_ring->desc, 0, rx_ring->size);
+
+	rx_ring->next_to_alloc = 0;
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+}
+
+/**
+ * iavf_free_rx_resources - Free Rx resources
+ * @rx_ring: ring to clean the resources from
+ *
+ * Free all receive software resources
+ **/
+void iavf_free_rx_resources(struct iavf_ring *rx_ring)
+{
+	iavf_clean_rx_ring(rx_ring);
+	kfree(rx_ring->rx_bi);
+	rx_ring->rx_bi = NULL;
+
+	if (rx_ring->desc) {
+		dma_free_coherent(rx_ring->dev, rx_ring->size,
+				  rx_ring->desc, rx_ring->dma);
+		rx_ring->desc = NULL;
+	}
+}
+
+/**
+ * iavf_setup_rx_descriptors - Allocate Rx descriptors
+ * @rx_ring: Rx descriptor ring (for a specific queue) to setup
+ *
+ * Returns 0 on success, negative on failure
+ **/
+int iavf_setup_rx_descriptors(struct iavf_ring *rx_ring)
+{
+	struct device *dev = rx_ring->dev;
+	int bi_size;
+
+	/* warn if we are about to overwrite the pointer */
+	WARN_ON(rx_ring->rx_bi);
+	bi_size = sizeof(struct iavf_rx_buffer) * rx_ring->count;
+	rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL);
+	if (!rx_ring->rx_bi)
+		goto err;
+
+	u64_stats_init(&rx_ring->syncp);
+
+	/* Round up to nearest 4K */
+	rx_ring->size = rx_ring->count * sizeof(union iavf_32byte_rx_desc);
+	rx_ring->size = ALIGN(rx_ring->size, 4096);
+	rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
+					   &rx_ring->dma, GFP_KERNEL);
+
+	if (!rx_ring->desc) {
+		dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n",
+			 rx_ring->size);
+		goto err;
+	}
+
+	rx_ring->next_to_alloc = 0;
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+
+	return 0;
+err:
+	kfree(rx_ring->rx_bi);
+	rx_ring->rx_bi = NULL;
+	return -ENOMEM;
+}
+
+/**
+ * iavf_release_rx_desc - Store the new tail and head values
+ * @rx_ring: ring to bump
+ * @val: new head index
+ **/
+static inline void iavf_release_rx_desc(struct iavf_ring *rx_ring, u32 val)
+{
+	rx_ring->next_to_use = val;
+
+	/* update next to alloc since we have filled the ring */
+	rx_ring->next_to_alloc = val;
+
+	/* Force memory writes to complete before letting h/w
+	 * know there are new descriptors to fetch.  (Only
+	 * applicable for weak-ordered memory model archs,
+	 * such as IA-64).
+	 */
+	wmb();
+	writel(val, rx_ring->tail);
+}
+
+/**
+ * iavf_rx_offset - Return expected offset into page to access data
+ * @rx_ring: Ring we are requesting offset of
+ *
+ * Returns the offset value for ring into the data buffer.
+ */
+static inline unsigned int iavf_rx_offset(struct iavf_ring *rx_ring)
+{
+	return ring_uses_build_skb(rx_ring) ? IAVF_SKB_PAD : 0;
+}
+
+/**
+ * iavf_alloc_mapped_page - recycle or make a new page
+ * @rx_ring: ring to use
+ * @bi: rx_buffer struct to modify
+ *
+ * Returns true if the page was successfully allocated or
+ * reused.
+ **/
+static bool iavf_alloc_mapped_page(struct iavf_ring *rx_ring,
+				   struct iavf_rx_buffer *bi)
+{
+	struct page *page = bi->page;
+	dma_addr_t dma;
+
+	/* since we are recycling buffers we should seldom need to alloc */
+	if (likely(page)) {
+		rx_ring->rx_stats.page_reuse_count++;
+		return true;
+	}
+
+	/* alloc new page for storage */
+	page = dev_alloc_pages(iavf_rx_pg_order(rx_ring));
+	if (unlikely(!page)) {
+		rx_ring->rx_stats.alloc_page_failed++;
+		return false;
+	}
+
+	/* map page for use */
+	dma = dma_map_page_attrs(rx_ring->dev, page, 0,
+				 iavf_rx_pg_size(rx_ring),
+				 DMA_FROM_DEVICE,
+				 IAVF_RX_DMA_ATTR);
+
+	/* if mapping failed free memory back to system since
+	 * there isn't much point in holding memory we can't use
+	 */
+	if (dma_mapping_error(rx_ring->dev, dma)) {
+		__free_pages(page, iavf_rx_pg_order(rx_ring));
+		rx_ring->rx_stats.alloc_page_failed++;
+		return false;
+	}
+
+	bi->dma = dma;
+	bi->page = page;
+	bi->page_offset = iavf_rx_offset(rx_ring);
+
+	/* initialize pagecnt_bias to 1 representing we fully own page */
+	bi->pagecnt_bias = 1;
+
+	return true;
+}
+
+/**
+ * iavf_receive_skb - Send a completed packet up the stack
+ * @rx_ring:  rx ring in play
+ * @skb: packet to send up
+ * @vlan_tag: vlan tag for packet
+ **/
+static void iavf_receive_skb(struct iavf_ring *rx_ring,
+			     struct sk_buff *skb, u16 vlan_tag)
+{
+	struct iavf_q_vector *q_vector = rx_ring->q_vector;
+
+	if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
+	    (vlan_tag & VLAN_VID_MASK))
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
+	else if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_STAG_RX) &&
+		 vlan_tag & VLAN_VID_MASK)
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), vlan_tag);
+
+	napi_gro_receive(&q_vector->napi, skb);
+}
+
+/**
+ * iavf_alloc_rx_buffers - Replace used receive buffers
+ * @rx_ring: ring to place buffers on
+ * @cleaned_count: number of buffers to replace
+ *
+ * Returns false if all allocations were successful, true if any fail
+ **/
+bool iavf_alloc_rx_buffers(struct iavf_ring *rx_ring, u16 cleaned_count)
+{
+	u16 ntu = rx_ring->next_to_use;
+	union iavf_rx_desc *rx_desc;
+	struct iavf_rx_buffer *bi;
+
+	/* do nothing if no valid netdev defined */
+	if (!rx_ring->netdev || !cleaned_count)
+		return false;
+
+	rx_desc = IAVF_RX_DESC(rx_ring, ntu);
+	bi = &rx_ring->rx_bi[ntu];
+
+	do {
+		if (!iavf_alloc_mapped_page(rx_ring, bi))
+			goto no_buffers;
+
+		/* sync the buffer for use by the device */
+		dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
+						 bi->page_offset,
+						 rx_ring->rx_buf_len,
+						 DMA_FROM_DEVICE);
+
+		/* Refresh the desc even if buffer_addrs didn't change
+		 * because each write-back erases this info.
+		 */
+		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
+
+		rx_desc++;
+		bi++;
+		ntu++;
+		if (unlikely(ntu == rx_ring->count)) {
+			rx_desc = IAVF_RX_DESC(rx_ring, 0);
+			bi = rx_ring->rx_bi;
+			ntu = 0;
+		}
+
+		/* clear the status bits for the next_to_use descriptor */
+		rx_desc->wb.qword1.status_error_len = 0;
+
+		cleaned_count--;
+	} while (cleaned_count);
+
+	if (rx_ring->next_to_use != ntu)
+		iavf_release_rx_desc(rx_ring, ntu);
+
+	return false;
+
+no_buffers:
+	if (rx_ring->next_to_use != ntu)
+		iavf_release_rx_desc(rx_ring, ntu);
+
+	/* make sure to come back via polling to try again after
+	 * allocation failure
+	 */
+	return true;
+}
+
+/**
+ * iavf_rx_checksum - Indicate in skb if hw indicated a good cksum
+ * @vsi: the VSI we care about
+ * @skb: skb currently being received and modified
+ * @rx_desc: the receive descriptor
+ **/
+static inline void iavf_rx_checksum(struct iavf_vsi *vsi,
+				    struct sk_buff *skb,
+				    union iavf_rx_desc *rx_desc)
+{
+	struct iavf_rx_ptype_decoded decoded;
+	u32 rx_error, rx_status;
+	bool ipv4, ipv6;
+	u8 ptype;
+	u64 qword;
+
+	qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+	ptype = (qword & IAVF_RXD_QW1_PTYPE_MASK) >> IAVF_RXD_QW1_PTYPE_SHIFT;
+	rx_error = (qword & IAVF_RXD_QW1_ERROR_MASK) >>
+		   IAVF_RXD_QW1_ERROR_SHIFT;
+	rx_status = (qword & IAVF_RXD_QW1_STATUS_MASK) >>
+		    IAVF_RXD_QW1_STATUS_SHIFT;
+	decoded = decode_rx_desc_ptype(ptype);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	skb_checksum_none_assert(skb);
+
+	/* Rx csum enabled and ip headers found? */
+	if (!(vsi->netdev->features & NETIF_F_RXCSUM))
+		return;
+
+	/* did the hardware decode the packet and checksum? */
+	if (!(rx_status & BIT(IAVF_RX_DESC_STATUS_L3L4P_SHIFT)))
+		return;
+
+	/* both known and outer_ip must be set for the below code to work */
+	if (!(decoded.known && decoded.outer_ip))
+		return;
+
+	ipv4 = (decoded.outer_ip == IAVF_RX_PTYPE_OUTER_IP) &&
+	       (decoded.outer_ip_ver == IAVF_RX_PTYPE_OUTER_IPV4);
+	ipv6 = (decoded.outer_ip == IAVF_RX_PTYPE_OUTER_IP) &&
+	       (decoded.outer_ip_ver == IAVF_RX_PTYPE_OUTER_IPV6);
+
+	if (ipv4 &&
+	    (rx_error & (BIT(IAVF_RX_DESC_ERROR_IPE_SHIFT) |
+			 BIT(IAVF_RX_DESC_ERROR_EIPE_SHIFT))))
+		goto checksum_fail;
+
+	/* likely incorrect csum if alternate IP extension headers found */
+	if (ipv6 &&
+	    rx_status & BIT(IAVF_RX_DESC_STATUS_IPV6EXADD_SHIFT))
+		/* don't increment checksum err here, non-fatal err */
+		return;
+
+	/* there was some L4 error, count error and punt packet to the stack */
+	if (rx_error & BIT(IAVF_RX_DESC_ERROR_L4E_SHIFT))
+		goto checksum_fail;
+
+	/* handle packets that were not able to be checksummed due
+	 * to arrival speed, in this case the stack can compute
+	 * the csum.
+	 */
+	if (rx_error & BIT(IAVF_RX_DESC_ERROR_PPRS_SHIFT))
+		return;
+
+	/* Only report checksum unnecessary for TCP, UDP, or SCTP */
+	switch (decoded.inner_prot) {
+	case IAVF_RX_PTYPE_INNER_PROT_TCP:
+	case IAVF_RX_PTYPE_INNER_PROT_UDP:
+	case IAVF_RX_PTYPE_INNER_PROT_SCTP:
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+		fallthrough;
+	default:
+		break;
+	}
+
+	return;
+
+checksum_fail:
+	vsi->back->hw_csum_rx_error++;
+}
+
+/**
+ * iavf_ptype_to_htype - get a hash type
+ * @ptype: the ptype value from the descriptor
+ *
+ * Returns a hash type to be used by skb_set_hash
+ **/
+static inline int iavf_ptype_to_htype(u8 ptype)
+{
+	struct iavf_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype);
+
+	if (!decoded.known)
+		return PKT_HASH_TYPE_NONE;
+
+	if (decoded.outer_ip == IAVF_RX_PTYPE_OUTER_IP &&
+	    decoded.payload_layer == IAVF_RX_PTYPE_PAYLOAD_LAYER_PAY4)
+		return PKT_HASH_TYPE_L4;
+	else if (decoded.outer_ip == IAVF_RX_PTYPE_OUTER_IP &&
+		 decoded.payload_layer == IAVF_RX_PTYPE_PAYLOAD_LAYER_PAY3)
+		return PKT_HASH_TYPE_L3;
+	else
+		return PKT_HASH_TYPE_L2;
+}
+
+/**
+ * iavf_rx_hash - set the hash value in the skb
+ * @ring: descriptor ring
+ * @rx_desc: specific descriptor
+ * @skb: skb currently being received and modified
+ * @rx_ptype: Rx packet type
+ **/
+static inline void iavf_rx_hash(struct iavf_ring *ring,
+				union iavf_rx_desc *rx_desc,
+				struct sk_buff *skb,
+				u8 rx_ptype)
+{
+	u32 hash;
+	const __le64 rss_mask =
+		cpu_to_le64((u64)IAVF_RX_DESC_FLTSTAT_RSS_HASH <<
+			    IAVF_RX_DESC_STATUS_FLTSTAT_SHIFT);
+
+	if (!(ring->netdev->features & NETIF_F_RXHASH))
+		return;
+
+	if ((rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) {
+		hash = le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss);
+		skb_set_hash(skb, hash, iavf_ptype_to_htype(rx_ptype));
+	}
+}
+
+/**
+ * iavf_process_skb_fields - Populate skb header fields from Rx descriptor
+ * @rx_ring: rx descriptor ring packet is being transacted on
+ * @rx_desc: pointer to the EOP Rx descriptor
+ * @skb: pointer to current skb being populated
+ * @rx_ptype: the packet type decoded by hardware
+ *
+ * This function checks the ring, descriptor, and packet information in
+ * order to populate the hash, checksum, VLAN, protocol, and
+ * other fields within the skb.
+ **/
+static inline
+void iavf_process_skb_fields(struct iavf_ring *rx_ring,
+			     union iavf_rx_desc *rx_desc, struct sk_buff *skb,
+			     u8 rx_ptype)
+{
+	iavf_rx_hash(rx_ring, rx_desc, skb, rx_ptype);
+
+	iavf_rx_checksum(rx_ring->vsi, skb, rx_desc);
+
+	skb_record_rx_queue(skb, rx_ring->queue_index);
+
+	/* modifies the skb - consumes the enet header */
+	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
+}
+
+/**
+ * iavf_cleanup_headers - Correct empty headers
+ * @rx_ring: rx descriptor ring packet is being transacted on
+ * @skb: pointer to current skb being fixed
+ *
+ * Also address the case where we are pulling data in on pages only
+ * and as such no data is present in the skb header.
+ *
+ * In addition if skb is not at least 60 bytes we need to pad it so that
+ * it is large enough to qualify as a valid Ethernet frame.
+ *
+ * Returns true if an error was encountered and skb was freed.
+ **/
+static bool iavf_cleanup_headers(struct iavf_ring *rx_ring, struct sk_buff *skb)
+{
+	/* if eth_skb_pad returns an error the skb was freed */
+	if (eth_skb_pad(skb))
+		return true;
+
+	return false;
+}
+
+/**
+ * iavf_reuse_rx_page - page flip buffer and store it back on the ring
+ * @rx_ring: rx descriptor ring to store buffers on
+ * @old_buff: donor buffer to have page reused
+ *
+ * Synchronizes page for reuse by the adapter
+ **/
+static void iavf_reuse_rx_page(struct iavf_ring *rx_ring,
+			       struct iavf_rx_buffer *old_buff)
+{
+	struct iavf_rx_buffer *new_buff;
+	u16 nta = rx_ring->next_to_alloc;
+
+	new_buff = &rx_ring->rx_bi[nta];
+
+	/* update, and store next to alloc */
+	nta++;
+	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
+
+	/* transfer page from old buffer to new buffer */
+	new_buff->dma		= old_buff->dma;
+	new_buff->page		= old_buff->page;
+	new_buff->page_offset	= old_buff->page_offset;
+	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
+}
+
+/**
+ * iavf_can_reuse_rx_page - Determine if this page can be reused by
+ * the adapter for another receive
+ *
+ * @rx_buffer: buffer containing the page
+ *
+ * If page is reusable, rx_buffer->page_offset is adjusted to point to
+ * an unused region in the page.
+ *
+ * For small pages, @truesize will be a constant value, half the size
+ * of the memory at page.  We'll attempt to alternate between high and
+ * low halves of the page, with one half ready for use by the hardware
+ * and the other half being consumed by the stack.  We use the page
+ * ref count to determine whether the stack has finished consuming the
+ * portion of this page that was passed up with a previous packet.  If
+ * the page ref count is >1, we'll assume the "other" half page is
+ * still busy, and this page cannot be reused.
+ *
+ * For larger pages, @truesize will be the actual space used by the
+ * received packet (adjusted upward to an even multiple of the cache
+ * line size).  This will advance through the page by the amount
+ * actually consumed by the received packets while there is still
+ * space for a buffer.  Each region of larger pages will be used at
+ * most once, after which the page will not be reused.
+ *
+ * In either case, if the page is reusable its refcount is increased.
+ **/
+static bool iavf_can_reuse_rx_page(struct iavf_rx_buffer *rx_buffer)
+{
+	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
+	struct page *page = rx_buffer->page;
+
+	/* Is any reuse possible? */
+	if (!dev_page_is_reusable(page))
+		return false;
+
+#if (PAGE_SIZE < 8192)
+	/* if we are only owner of page we can reuse it */
+	if (unlikely((page_count(page) - pagecnt_bias) > 1))
+		return false;
+#else
+#define IAVF_LAST_OFFSET \
+	(SKB_WITH_OVERHEAD(PAGE_SIZE) - IAVF_RXBUFFER_2048)
+	if (rx_buffer->page_offset > IAVF_LAST_OFFSET)
+		return false;
+#endif
+
+	/* If we have drained the page fragment pool we need to update
+	 * the pagecnt_bias and page count so that we fully restock the
+	 * number of references the driver holds.
+	 */
+	if (unlikely(!pagecnt_bias)) {
+		page_ref_add(page, USHRT_MAX);
+		rx_buffer->pagecnt_bias = USHRT_MAX;
+	}
+
+	return true;
+}
+
+/**
+ * iavf_add_rx_frag - Add contents of Rx buffer to sk_buff
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @rx_buffer: buffer containing page to add
+ * @skb: sk_buff to place the data into
+ * @size: packet length from rx_desc
+ *
+ * This function will add the data contained in rx_buffer->page to the skb.
+ * It will just attach the page as a frag to the skb.
+ *
+ * The function will then update the page offset.
+ **/
+static void iavf_add_rx_frag(struct iavf_ring *rx_ring,
+			     struct iavf_rx_buffer *rx_buffer,
+			     struct sk_buff *skb,
+			     unsigned int size)
+{
+#if (PAGE_SIZE < 8192)
+	unsigned int truesize = iavf_rx_pg_size(rx_ring) / 2;
+#else
+	unsigned int truesize = SKB_DATA_ALIGN(size + iavf_rx_offset(rx_ring));
+#endif
+
+	if (!size)
+		return;
+
+	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
+			rx_buffer->page_offset, size, truesize);
+
+	/* page is being used so we must update the page offset */
+#if (PAGE_SIZE < 8192)
+	rx_buffer->page_offset ^= truesize;
+#else
+	rx_buffer->page_offset += truesize;
+#endif
+}
+
+/**
+ * iavf_get_rx_buffer - Fetch Rx buffer and synchronize data for use
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @size: size of buffer to add to skb
+ *
+ * This function will pull an Rx buffer from the ring and synchronize it
+ * for use by the CPU.
+ */
+static struct iavf_rx_buffer *iavf_get_rx_buffer(struct iavf_ring *rx_ring,
+						 const unsigned int size)
+{
+	struct iavf_rx_buffer *rx_buffer;
+
+	rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean];
+	prefetchw(rx_buffer->page);
+	if (!size)
+		return rx_buffer;
+
+	/* we are reusing so sync this buffer for CPU use */
+	dma_sync_single_range_for_cpu(rx_ring->dev,
+				      rx_buffer->dma,
+				      rx_buffer->page_offset,
+				      size,
+				      DMA_FROM_DEVICE);
+
+	/* We have pulled a buffer for use, so decrement pagecnt_bias */
+	rx_buffer->pagecnt_bias--;
+
+	return rx_buffer;
+}
+
+/**
+ * iavf_construct_skb - Allocate skb and populate it
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @rx_buffer: rx buffer to pull data from
+ * @size: size of buffer to add to skb
+ *
+ * This function allocates an skb.  It then populates it with the page
+ * data from the current receive descriptor, taking care to set up the
+ * skb correctly.
+ */
+static struct sk_buff *iavf_construct_skb(struct iavf_ring *rx_ring,
+					  struct iavf_rx_buffer *rx_buffer,
+					  unsigned int size)
+{
+	void *va;
+#if (PAGE_SIZE < 8192)
+	unsigned int truesize = iavf_rx_pg_size(rx_ring) / 2;
+#else
+	unsigned int truesize = SKB_DATA_ALIGN(size);
+#endif
+	unsigned int headlen;
+	struct sk_buff *skb;
+
+	if (!rx_buffer)
+		return NULL;
+	/* prefetch first cache line of first page */
+	va = page_address(rx_buffer->page) + rx_buffer->page_offset;
+	net_prefetch(va);
+
+	/* allocate a skb to store the frags */
+	skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
+			       IAVF_RX_HDR_SIZE,
+			       GFP_ATOMIC | __GFP_NOWARN);
+	if (unlikely(!skb))
+		return NULL;
+
+	/* Determine available headroom for copy */
+	headlen = size;
+	if (headlen > IAVF_RX_HDR_SIZE)
+		headlen = eth_get_headlen(skb->dev, va, IAVF_RX_HDR_SIZE);
+
+	/* align pull length to size of long to optimize memcpy performance */
+	memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
+
+	/* update all of the pointers */
+	size -= headlen;
+	if (size) {
+		skb_add_rx_frag(skb, 0, rx_buffer->page,
+				rx_buffer->page_offset + headlen,
+				size, truesize);
+
+		/* buffer is used by skb, update page_offset */
+#if (PAGE_SIZE < 8192)
+		rx_buffer->page_offset ^= truesize;
+#else
+		rx_buffer->page_offset += truesize;
+#endif
+	} else {
+		/* buffer is unused, reset bias back to rx_buffer */
+		rx_buffer->pagecnt_bias++;
+	}
+
+	return skb;
+}
+
+/**
+ * iavf_build_skb - Build skb around an existing buffer
+ * @rx_ring: Rx descriptor ring to transact packets on
+ * @rx_buffer: Rx buffer to pull data from
+ * @size: size of buffer to add to skb
+ *
+ * This function builds an skb around an existing Rx buffer, taking care
+ * to set up the skb correctly and avoid any memcpy overhead.
+ */
+static struct sk_buff *iavf_build_skb(struct iavf_ring *rx_ring,
+				      struct iavf_rx_buffer *rx_buffer,
+				      unsigned int size)
+{
+	void *va;
+#if (PAGE_SIZE < 8192)
+	unsigned int truesize = iavf_rx_pg_size(rx_ring) / 2;
+#else
+	unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
+				SKB_DATA_ALIGN(IAVF_SKB_PAD + size);
+#endif
+	struct sk_buff *skb;
+
+	if (!rx_buffer || !size)
+		return NULL;
+	/* prefetch first cache line of first page */
+	va = page_address(rx_buffer->page) + rx_buffer->page_offset;
+	net_prefetch(va);
+
+	/* build an skb around the page buffer */
+	skb = napi_build_skb(va - IAVF_SKB_PAD, truesize);
+	if (unlikely(!skb))
+		return NULL;
+
+	/* update pointers within the skb to store the data */
+	skb_reserve(skb, IAVF_SKB_PAD);
+	__skb_put(skb, size);
+
+	/* buffer is used by skb, update page_offset */
+#if (PAGE_SIZE < 8192)
+	rx_buffer->page_offset ^= truesize;
+#else
+	rx_buffer->page_offset += truesize;
+#endif
+
+	return skb;
+}
+
+/**
+ * iavf_put_rx_buffer - Clean up used buffer and either recycle or free
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @rx_buffer: rx buffer to pull data from
+ *
+ * This function will clean up the contents of the rx_buffer.  It will
+ * either recycle the buffer or unmap it and free the associated resources.
+ */
+static void iavf_put_rx_buffer(struct iavf_ring *rx_ring,
+			       struct iavf_rx_buffer *rx_buffer)
+{
+	if (!rx_buffer)
+		return;
+
+	if (iavf_can_reuse_rx_page(rx_buffer)) {
+		/* hand second half of page back to the ring */
+		iavf_reuse_rx_page(rx_ring, rx_buffer);
+		rx_ring->rx_stats.page_reuse_count++;
+	} else {
+		/* we are not reusing the buffer so unmap it */
+		dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
+				     iavf_rx_pg_size(rx_ring),
+				     DMA_FROM_DEVICE, IAVF_RX_DMA_ATTR);
+		__page_frag_cache_drain(rx_buffer->page,
+					rx_buffer->pagecnt_bias);
+	}
+
+	/* clear contents of buffer_info */
+	rx_buffer->page = NULL;
+}
+
+/**
+ * iavf_is_non_eop - process handling of non-EOP buffers
+ * @rx_ring: Rx ring being processed
+ * @rx_desc: Rx descriptor for current buffer
+ * @skb: Current socket buffer containing buffer in progress
+ *
+ * This function updates next to clean.  If the buffer is an EOP buffer
+ * this function exits returning false, otherwise it will place the
+ * sk_buff in the next buffer to be chained and return true indicating
+ * that this is in fact a non-EOP buffer.
+ **/
+static bool iavf_is_non_eop(struct iavf_ring *rx_ring,
+			    union iavf_rx_desc *rx_desc,
+			    struct sk_buff *skb)
+{
+	u32 ntc = rx_ring->next_to_clean + 1;
+
+	/* fetch, update, and store next to clean */
+	ntc = (ntc < rx_ring->count) ? ntc : 0;
+	rx_ring->next_to_clean = ntc;
+
+	prefetch(IAVF_RX_DESC(rx_ring, ntc));
+
+	/* if we are the last buffer then there is nothing else to do */
+#define IAVF_RXD_EOF BIT(IAVF_RX_DESC_STATUS_EOF_SHIFT)
+	if (likely(iavf_test_staterr(rx_desc, IAVF_RXD_EOF)))
+		return false;
+
+	rx_ring->rx_stats.non_eop_descs++;
+
+	return true;
+}
+
+/**
+ * iavf_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @budget: Total limit on number of packets to process
+ *
+ * This function provides a "bounce buffer" approach to Rx interrupt
+ * processing.  The advantage to this is that on systems that have
+ * expensive overhead for IOMMU access this provides a means of avoiding
+ * it by maintaining the mapping of the page to the system.
+ *
+ * Returns amount of work completed
+ **/
+static int iavf_clean_rx_irq(struct iavf_ring *rx_ring, int budget)
+{
+	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
+	struct sk_buff *skb = rx_ring->skb;
+	u16 cleaned_count = IAVF_DESC_UNUSED(rx_ring);
+	bool failure = false;
+
+	while (likely(total_rx_packets < (unsigned int)budget)) {
+		struct iavf_rx_buffer *rx_buffer;
+		union iavf_rx_desc *rx_desc;
+		unsigned int size;
+		u16 vlan_tag = 0;
+		u8 rx_ptype;
+		u64 qword;
+
+		/* return some buffers to hardware, one at a time is too slow */
+		if (cleaned_count >= IAVF_RX_BUFFER_WRITE) {
+			failure = failure ||
+				  iavf_alloc_rx_buffers(rx_ring, cleaned_count);
+			cleaned_count = 0;
+		}
+
+		rx_desc = IAVF_RX_DESC(rx_ring, rx_ring->next_to_clean);
+
+		/* status_error_len will always be zero for unused descriptors
+		 * because it's cleared in cleanup, and overlaps with hdr_addr
+		 * which is always zero because packet split isn't used, if the
+		 * hardware wrote DD then the length will be non-zero
+		 */
+		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+
+		/* This memory barrier is needed to keep us from reading
+		 * any other fields out of the rx_desc until we have
+		 * verified the descriptor has been written back.
+		 */
+		dma_rmb();
+#define IAVF_RXD_DD BIT(IAVF_RX_DESC_STATUS_DD_SHIFT)
+		if (!iavf_test_staterr(rx_desc, IAVF_RXD_DD))
+			break;
+
+		size = (qword & IAVF_RXD_QW1_LENGTH_PBUF_MASK) >>
+		       IAVF_RXD_QW1_LENGTH_PBUF_SHIFT;
+
+		iavf_trace(clean_rx_irq, rx_ring, rx_desc, skb);
+		rx_buffer = iavf_get_rx_buffer(rx_ring, size);
+
+		/* retrieve a buffer from the ring */
+		if (skb)
+			iavf_add_rx_frag(rx_ring, rx_buffer, skb, size);
+		else if (ring_uses_build_skb(rx_ring))
+			skb = iavf_build_skb(rx_ring, rx_buffer, size);
+		else
+			skb = iavf_construct_skb(rx_ring, rx_buffer, size);
+
+		/* exit if we failed to retrieve a buffer */
+		if (!skb) {
+			rx_ring->rx_stats.alloc_buff_failed++;
+			if (rx_buffer && size)
+				rx_buffer->pagecnt_bias++;
+			break;
+		}
+
+		iavf_put_rx_buffer(rx_ring, rx_buffer);
+		cleaned_count++;
+
+		if (iavf_is_non_eop(rx_ring, rx_desc, skb))
+			continue;
+
+		/* ERR_MASK will only have valid bits if EOP set, and
+		 * what we are doing here is actually checking
+		 * IAVF_RX_DESC_ERROR_RXE_SHIFT, since it is the zeroth bit in
+		 * the error field
+		 */
+		if (unlikely(iavf_test_staterr(rx_desc, BIT(IAVF_RXD_QW1_ERROR_SHIFT)))) {
+			dev_kfree_skb_any(skb);
+			skb = NULL;
+			continue;
+		}
+
+		if (iavf_cleanup_headers(rx_ring, skb)) {
+			skb = NULL;
+			continue;
+		}
+
+		/* probably a little skewed due to removing CRC */
+		total_rx_bytes += skb->len;
+
+		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+		rx_ptype = (qword & IAVF_RXD_QW1_PTYPE_MASK) >>
+			   IAVF_RXD_QW1_PTYPE_SHIFT;
+
+		/* populate checksum, VLAN, and protocol */
+		iavf_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
+
+		if (qword & BIT(IAVF_RX_DESC_STATUS_L2TAG1P_SHIFT) &&
+		    rx_ring->flags & IAVF_TXRX_FLAGS_VLAN_TAG_LOC_L2TAG1)
+			vlan_tag = le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1);
+		if (rx_desc->wb.qword2.ext_status &
+		    cpu_to_le16(BIT(IAVF_RX_DESC_EXT_STATUS_L2TAG2P_SHIFT)) &&
+		    rx_ring->flags & IAVF_RXR_FLAGS_VLAN_TAG_LOC_L2TAG2_2)
+			vlan_tag = le16_to_cpu(rx_desc->wb.qword2.l2tag2_2);
+
+		iavf_trace(clean_rx_irq_rx, rx_ring, rx_desc, skb);
+		iavf_receive_skb(rx_ring, skb, vlan_tag);
+		skb = NULL;
+
+		/* update budget accounting */
+		total_rx_packets++;
+	}
+
+	rx_ring->skb = skb;
+
+	u64_stats_update_begin(&rx_ring->syncp);
+	rx_ring->stats.packets += total_rx_packets;
+	rx_ring->stats.bytes += total_rx_bytes;
+	u64_stats_update_end(&rx_ring->syncp);
+	rx_ring->q_vector->rx.total_packets += total_rx_packets;
+	rx_ring->q_vector->rx.total_bytes += total_rx_bytes;
+
+	/* guarantee a trip back through this routine if there was a failure */
+	return failure ? budget : (int)total_rx_packets;
+}
+
+static inline u32 iavf_buildreg_itr(const int type, u16 itr)
+{
+	u32 val;
+
+	/* We don't bother with setting the CLEARPBA bit as the data sheet
+	 * points out doing so is "meaningless since it was already
+	 * auto-cleared". The auto-clearing happens when the interrupt is
+	 * asserted.
+	 *
+	 * Hardware errata 28 for also indicates that writing to a
+	 * xxINT_DYN_CTLx CSR with INTENA_MSK (bit 31) set to 0 will clear
+	 * an event in the PBA anyway so we need to rely on the automask
+	 * to hold pending events for us until the interrupt is re-enabled
+	 *
+	 * The itr value is reported in microseconds, and the register
+	 * value is recorded in 2 microsecond units. For this reason we
+	 * only need to shift by the interval shift - 1 instead of the
+	 * full value.
+	 */
+	itr &= IAVF_ITR_MASK;
+
+	val = IAVF_VFINT_DYN_CTLN1_INTENA_MASK |
+	      (type << IAVF_VFINT_DYN_CTLN1_ITR_INDX_SHIFT) |
+	      (itr << (IAVF_VFINT_DYN_CTLN1_INTERVAL_SHIFT - 1));
+
+	return val;
+}
+
+/* a small macro to shorten up some long lines */
+#define INTREG IAVF_VFINT_DYN_CTLN1
+
+/* The act of updating the ITR will cause it to immediately trigger. In order
+ * to prevent this from throwing off adaptive update statistics we defer the
+ * update so that it can only happen so often. So after either Tx or Rx are
+ * updated we make the adaptive scheme wait until either the ITR completely
+ * expires via the next_update expiration or we have been through at least
+ * 3 interrupts.
+ */
+#define ITR_COUNTDOWN_START 3
+
+/**
+ * iavf_update_enable_itr - Update itr and re-enable MSIX interrupt
+ * @vsi: the VSI we care about
+ * @q_vector: q_vector for which itr is being updated and interrupt enabled
+ *
+ **/
+static inline void iavf_update_enable_itr(struct iavf_vsi *vsi,
+					  struct iavf_q_vector *q_vector)
+{
+	struct iavf_hw *hw = &vsi->back->hw;
+	u32 intval;
+
+	/* These will do nothing if dynamic updates are not enabled */
+	iavf_update_itr(q_vector, &q_vector->tx);
+	iavf_update_itr(q_vector, &q_vector->rx);
+
+	/* This block of logic allows us to get away with only updating
+	 * one ITR value with each interrupt. The idea is to perform a
+	 * pseudo-lazy update with the following criteria.
+	 *
+	 * 1. Rx is given higher priority than Tx if both are in same state
+	 * 2. If we must reduce an ITR that is given highest priority.
+	 * 3. We then give priority to increasing ITR based on amount.
+	 */
+	if (q_vector->rx.target_itr < q_vector->rx.current_itr) {
+		/* Rx ITR needs to be reduced, this is highest priority */
+		intval = iavf_buildreg_itr(IAVF_RX_ITR,
+					   q_vector->rx.target_itr);
+		q_vector->rx.current_itr = q_vector->rx.target_itr;
+		q_vector->itr_countdown = ITR_COUNTDOWN_START;
+	} else if ((q_vector->tx.target_itr < q_vector->tx.current_itr) ||
+		   ((q_vector->rx.target_itr - q_vector->rx.current_itr) <
+		    (q_vector->tx.target_itr - q_vector->tx.current_itr))) {
+		/* Tx ITR needs to be reduced, this is second priority
+		 * Tx ITR needs to be increased more than Rx, fourth priority
+		 */
+		intval = iavf_buildreg_itr(IAVF_TX_ITR,
+					   q_vector->tx.target_itr);
+		q_vector->tx.current_itr = q_vector->tx.target_itr;
+		q_vector->itr_countdown = ITR_COUNTDOWN_START;
+	} else if (q_vector->rx.current_itr != q_vector->rx.target_itr) {
+		/* Rx ITR needs to be increased, third priority */
+		intval = iavf_buildreg_itr(IAVF_RX_ITR,
+					   q_vector->rx.target_itr);
+		q_vector->rx.current_itr = q_vector->rx.target_itr;
+		q_vector->itr_countdown = ITR_COUNTDOWN_START;
+	} else {
+		/* No ITR update, lowest priority */
+		intval = iavf_buildreg_itr(IAVF_ITR_NONE, 0);
+		if (q_vector->itr_countdown)
+			q_vector->itr_countdown--;
+	}
+
+	if (!test_bit(__IAVF_VSI_DOWN, vsi->state))
+		wr32(hw, INTREG(q_vector->reg_idx), intval);
+}
+
+/**
+ * iavf_napi_poll - NAPI polling Rx/Tx cleanup routine
+ * @napi: napi struct with our devices info in it
+ * @budget: amount of work driver is allowed to do this pass, in packets
+ *
+ * This function will clean all queues associated with a q_vector.
+ *
+ * Returns the amount of work done
+ **/
+int iavf_napi_poll(struct napi_struct *napi, int budget)
+{
+	struct iavf_q_vector *q_vector =
+			       container_of(napi, struct iavf_q_vector, napi);
+	struct iavf_vsi *vsi = q_vector->vsi;
+	struct iavf_ring *ring;
+	bool clean_complete = true;
+	bool arm_wb = false;
+	int budget_per_ring;
+	int work_done = 0;
+
+	if (test_bit(__IAVF_VSI_DOWN, vsi->state)) {
+		napi_complete(napi);
+		return 0;
+	}
+
+	/* Since the actual Tx work is minimal, we can give the Tx a larger
+	 * budget and be more aggressive about cleaning up the Tx descriptors.
+	 */
+	iavf_for_each_ring(ring, q_vector->tx) {
+		if (!iavf_clean_tx_irq(vsi, ring, budget)) {
+			clean_complete = false;
+			continue;
+		}
+		arm_wb |= ring->arm_wb;
+		ring->arm_wb = false;
+	}
+
+	/* Handle case where we are called by netpoll with a budget of 0 */
+	if (budget <= 0)
+		goto tx_only;
+
+	/* We attempt to distribute budget to each Rx queue fairly, but don't
+	 * allow the budget to go below 1 because that would exit polling early.
+	 */
+	budget_per_ring = max(budget/q_vector->num_ringpairs, 1);
+
+	iavf_for_each_ring(ring, q_vector->rx) {
+		int cleaned = iavf_clean_rx_irq(ring, budget_per_ring);
+
+		work_done += cleaned;
+		/* if we clean as many as budgeted, we must not be done */
+		if (cleaned >= budget_per_ring)
+			clean_complete = false;
+	}
+
+	/* If work not completed, return budget and polling will return */
+	if (!clean_complete) {
+		int cpu_id = smp_processor_id();
+
+		/* It is possible that the interrupt affinity has changed but,
+		 * if the cpu is pegged at 100%, polling will never exit while
+		 * traffic continues and the interrupt will be stuck on this
+		 * cpu.  We check to make sure affinity is correct before we
+		 * continue to poll, otherwise we must stop polling so the
+		 * interrupt can move to the correct cpu.
+		 */
+		if (!cpumask_test_cpu(cpu_id, &q_vector->affinity_mask)) {
+			/* Tell napi that we are done polling */
+			napi_complete_done(napi, work_done);
+
+			/* Force an interrupt */
+			iavf_force_wb(vsi, q_vector);
+
+			/* Return budget-1 so that polling stops */
+			return budget - 1;
+		}
+tx_only:
+		if (arm_wb) {
+			q_vector->tx.ring[0].tx_stats.tx_force_wb++;
+			iavf_enable_wb_on_itr(vsi, q_vector);
+		}
+		return budget;
+	}
+
+	if (vsi->back->flags & IAVF_TXR_FLAGS_WB_ON_ITR)
+		q_vector->arm_wb_state = false;
+
+	/* Exit the polling mode, but don't re-enable interrupts if stack might
+	 * poll us due to busy-polling
+	 */
+	if (likely(napi_complete_done(napi, work_done)))
+		iavf_update_enable_itr(vsi, q_vector);
+
+	return min_t(int, work_done, budget - 1);
+}
+
+/**
+ * iavf_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW
+ * @skb:     send buffer
+ * @tx_ring: ring to send buffer on
+ * @flags:   the tx flags to be set
+ *
+ * Checks the skb and set up correspondingly several generic transmit flags
+ * related to VLAN tagging for the HW, such as VLAN, DCB, etc.
+ *
+ * Returns error code indicate the frame should be dropped upon error and the
+ * otherwise  returns 0 to indicate the flags has been set properly.
+ **/
+static void iavf_tx_prepare_vlan_flags(struct sk_buff *skb,
+				       struct iavf_ring *tx_ring, u32 *flags)
+{
+	u32  tx_flags = 0;
+
+
+	/* stack will only request hardware VLAN insertion offload for protocols
+	 * that the driver supports and has enabled
+	 */
+	if (!skb_vlan_tag_present(skb))
+		return;
+
+	tx_flags |= skb_vlan_tag_get(skb) << IAVF_TX_FLAGS_VLAN_SHIFT;
+	if (tx_ring->flags & IAVF_TXR_FLAGS_VLAN_TAG_LOC_L2TAG2) {
+		tx_flags |= IAVF_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
+	} else if (tx_ring->flags & IAVF_TXRX_FLAGS_VLAN_TAG_LOC_L2TAG1) {
+		tx_flags |= IAVF_TX_FLAGS_HW_VLAN;
+	} else {
+		dev_dbg(tx_ring->dev, "Unsupported Tx VLAN tag location requested\n");
+		return;
+	}
+
+	*flags = tx_flags;
+}
+
+/**
+ * iavf_tso - set up the tso context descriptor
+ * @first:    pointer to first Tx buffer for xmit
+ * @hdr_len:  ptr to the size of the packet header
+ * @cd_type_cmd_tso_mss: Quad Word 1
+ *
+ * Returns 0 if no TSO can happen, 1 if tso is going, or error
+ **/
+static int iavf_tso(struct iavf_tx_buffer *first, u8 *hdr_len,
+		    u64 *cd_type_cmd_tso_mss)
+{
+	struct sk_buff *skb = first->skb;
+	u64 cd_cmd, cd_tso_len, cd_mss;
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		struct udphdr *udp;
+		unsigned char *hdr;
+	} l4;
+	u32 paylen, l4_offset;
+	u16 gso_segs, gso_size;
+	int err;
+
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		return 0;
+
+	if (!skb_is_gso(skb))
+		return 0;
+
+	err = skb_cow_head(skb, 0);
+	if (err < 0)
+		return err;
+
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_transport_header(skb);
+
+	/* initialize outer IP header fields */
+	if (ip.v4->version == 4) {
+		ip.v4->tot_len = 0;
+		ip.v4->check = 0;
+	} else {
+		ip.v6->payload_len = 0;
+	}
+
+	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
+					 SKB_GSO_GRE_CSUM |
+					 SKB_GSO_IPXIP4 |
+					 SKB_GSO_IPXIP6 |
+					 SKB_GSO_UDP_TUNNEL |
+					 SKB_GSO_UDP_TUNNEL_CSUM)) {
+		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
+			l4.udp->len = 0;
+
+			/* determine offset of outer transport header */
+			l4_offset = l4.hdr - skb->data;
+
+			/* remove payload length from outer checksum */
+			paylen = skb->len - l4_offset;
+			csum_replace_by_diff(&l4.udp->check,
+					     (__force __wsum)htonl(paylen));
+		}
+
+		/* reset pointers to inner headers */
+		ip.hdr = skb_inner_network_header(skb);
+		l4.hdr = skb_inner_transport_header(skb);
+
+		/* initialize inner IP header fields */
+		if (ip.v4->version == 4) {
+			ip.v4->tot_len = 0;
+			ip.v4->check = 0;
+		} else {
+			ip.v6->payload_len = 0;
+		}
+	}
+
+	/* determine offset of inner transport header */
+	l4_offset = l4.hdr - skb->data;
+	/* remove payload length from inner checksum */
+	paylen = skb->len - l4_offset;
+
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
+		csum_replace_by_diff(&l4.udp->check,
+				     (__force __wsum)htonl(paylen));
+		/* compute length of UDP segmentation header */
+		*hdr_len = (u8)sizeof(l4.udp) + l4_offset;
+	} else {
+		csum_replace_by_diff(&l4.tcp->check,
+				     (__force __wsum)htonl(paylen));
+		/* compute length of TCP segmentation header */
+		*hdr_len = (u8)((l4.tcp->doff * 4) + l4_offset);
+	}
+
+	/* pull values out of skb_shinfo */
+	gso_size = skb_shinfo(skb)->gso_size;
+	gso_segs = skb_shinfo(skb)->gso_segs;
+
+	/* update GSO size and bytecount with header size */
+	first->gso_segs = gso_segs;
+	first->bytecount += (first->gso_segs - 1) * *hdr_len;
+
+	/* find the field values */
+	cd_cmd = IAVF_TX_CTX_DESC_TSO;
+	cd_tso_len = skb->len - *hdr_len;
+	cd_mss = gso_size;
+	*cd_type_cmd_tso_mss |= (cd_cmd << IAVF_TXD_CTX_QW1_CMD_SHIFT) |
+				(cd_tso_len << IAVF_TXD_CTX_QW1_TSO_LEN_SHIFT) |
+				(cd_mss << IAVF_TXD_CTX_QW1_MSS_SHIFT);
+	return 1;
+}
+
+/**
+ * iavf_tx_enable_csum - Enable Tx checksum offloads
+ * @skb: send buffer
+ * @tx_flags: pointer to Tx flags currently set
+ * @td_cmd: Tx descriptor command bits to set
+ * @td_offset: Tx descriptor header offsets to set
+ * @tx_ring: Tx descriptor ring
+ * @cd_tunneling: ptr to context desc bits
+ **/
+static int iavf_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
+			       u32 *td_cmd, u32 *td_offset,
+			       struct iavf_ring *tx_ring,
+			       u32 *cd_tunneling)
+{
+	union {
+		struct iphdr *v4;
+		struct ipv6hdr *v6;
+		unsigned char *hdr;
+	} ip;
+	union {
+		struct tcphdr *tcp;
+		struct udphdr *udp;
+		unsigned char *hdr;
+	} l4;
+	unsigned char *exthdr;
+	u32 offset, cmd = 0;
+	__be16 frag_off;
+	u8 l4_proto = 0;
+
+	if (skb->ip_summed != CHECKSUM_PARTIAL)
+		return 0;
+
+	ip.hdr = skb_network_header(skb);
+	l4.hdr = skb_transport_header(skb);
+
+	/* compute outer L2 header size */
+	offset = ((ip.hdr - skb->data) / 2) << IAVF_TX_DESC_LENGTH_MACLEN_SHIFT;
+
+	if (skb->encapsulation) {
+		u32 tunnel = 0;
+		/* define outer network header type */
+		if (*tx_flags & IAVF_TX_FLAGS_IPV4) {
+			tunnel |= (*tx_flags & IAVF_TX_FLAGS_TSO) ?
+				  IAVF_TX_CTX_EXT_IP_IPV4 :
+				  IAVF_TX_CTX_EXT_IP_IPV4_NO_CSUM;
+
+			l4_proto = ip.v4->protocol;
+		} else if (*tx_flags & IAVF_TX_FLAGS_IPV6) {
+			tunnel |= IAVF_TX_CTX_EXT_IP_IPV6;
+
+			exthdr = ip.hdr + sizeof(*ip.v6);
+			l4_proto = ip.v6->nexthdr;
+			if (l4.hdr != exthdr)
+				ipv6_skip_exthdr(skb, exthdr - skb->data,
+						 &l4_proto, &frag_off);
+		}
+
+		/* define outer transport */
+		switch (l4_proto) {
+		case IPPROTO_UDP:
+			tunnel |= IAVF_TXD_CTX_UDP_TUNNELING;
+			*tx_flags |= IAVF_TX_FLAGS_VXLAN_TUNNEL;
+			break;
+		case IPPROTO_GRE:
+			tunnel |= IAVF_TXD_CTX_GRE_TUNNELING;
+			*tx_flags |= IAVF_TX_FLAGS_VXLAN_TUNNEL;
+			break;
+		case IPPROTO_IPIP:
+		case IPPROTO_IPV6:
+			*tx_flags |= IAVF_TX_FLAGS_VXLAN_TUNNEL;
+			l4.hdr = skb_inner_network_header(skb);
+			break;
+		default:
+			if (*tx_flags & IAVF_TX_FLAGS_TSO)
+				return -1;
+
+			skb_checksum_help(skb);
+			return 0;
+		}
+
+		/* compute outer L3 header size */
+		tunnel |= ((l4.hdr - ip.hdr) / 4) <<
+			  IAVF_TXD_CTX_QW0_EXT_IPLEN_SHIFT;
+
+		/* switch IP header pointer from outer to inner header */
+		ip.hdr = skb_inner_network_header(skb);
+
+		/* compute tunnel header size */
+		tunnel |= ((ip.hdr - l4.hdr) / 2) <<
+			  IAVF_TXD_CTX_QW0_NATLEN_SHIFT;
+
+		/* indicate if we need to offload outer UDP header */
+		if ((*tx_flags & IAVF_TX_FLAGS_TSO) &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
+		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
+			tunnel |= IAVF_TXD_CTX_QW0_L4T_CS_MASK;
+
+		/* record tunnel offload values */
+		*cd_tunneling |= tunnel;
+
+		/* switch L4 header pointer from outer to inner */
+		l4.hdr = skb_inner_transport_header(skb);
+		l4_proto = 0;
+
+		/* reset type as we transition from outer to inner headers */
+		*tx_flags &= ~(IAVF_TX_FLAGS_IPV4 | IAVF_TX_FLAGS_IPV6);
+		if (ip.v4->version == 4)
+			*tx_flags |= IAVF_TX_FLAGS_IPV4;
+		if (ip.v6->version == 6)
+			*tx_flags |= IAVF_TX_FLAGS_IPV6;
+	}
+
+	/* Enable IP checksum offloads */
+	if (*tx_flags & IAVF_TX_FLAGS_IPV4) {
+		l4_proto = ip.v4->protocol;
+		/* the stack computes the IP header already, the only time we
+		 * need the hardware to recompute it is in the case of TSO.
+		 */
+		cmd |= (*tx_flags & IAVF_TX_FLAGS_TSO) ?
+		       IAVF_TX_DESC_CMD_IIPT_IPV4_CSUM :
+		       IAVF_TX_DESC_CMD_IIPT_IPV4;
+	} else if (*tx_flags & IAVF_TX_FLAGS_IPV6) {
+		cmd |= IAVF_TX_DESC_CMD_IIPT_IPV6;
+
+		exthdr = ip.hdr + sizeof(*ip.v6);
+		l4_proto = ip.v6->nexthdr;
+		if (l4.hdr != exthdr)
+			ipv6_skip_exthdr(skb, exthdr - skb->data,
+					 &l4_proto, &frag_off);
+	}
+
+	/* compute inner L3 header size */
+	offset |= ((l4.hdr - ip.hdr) / 4) << IAVF_TX_DESC_LENGTH_IPLEN_SHIFT;
+
+	/* Enable L4 checksum offloads */
+	switch (l4_proto) {
+	case IPPROTO_TCP:
+		/* enable checksum offloads */
+		cmd |= IAVF_TX_DESC_CMD_L4T_EOFT_TCP;
+		offset |= l4.tcp->doff << IAVF_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
+		break;
+	case IPPROTO_SCTP:
+		/* enable SCTP checksum offload */
+		cmd |= IAVF_TX_DESC_CMD_L4T_EOFT_SCTP;
+		offset |= (sizeof(struct sctphdr) >> 2) <<
+			  IAVF_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
+		break;
+	case IPPROTO_UDP:
+		/* enable UDP checksum offload */
+		cmd |= IAVF_TX_DESC_CMD_L4T_EOFT_UDP;
+		offset |= (sizeof(struct udphdr) >> 2) <<
+			  IAVF_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
+		break;
+	default:
+		if (*tx_flags & IAVF_TX_FLAGS_TSO)
+			return -1;
+		skb_checksum_help(skb);
+		return 0;
+	}
+
+	*td_cmd |= cmd;
+	*td_offset |= offset;
+
+	return 1;
+}
+
+/**
+ * iavf_create_tx_ctx - Build the Tx context descriptor
+ * @tx_ring:  ring to create the descriptor on
+ * @cd_type_cmd_tso_mss: Quad Word 1
+ * @cd_tunneling: Quad Word 0 - bits 0-31
+ * @cd_l2tag2: Quad Word 0 - bits 32-63
+ **/
+static void iavf_create_tx_ctx(struct iavf_ring *tx_ring,
+			       const u64 cd_type_cmd_tso_mss,
+			       const u32 cd_tunneling, const u32 cd_l2tag2)
+{
+	struct iavf_tx_context_desc *context_desc;
+	int i = tx_ring->next_to_use;
+
+	if ((cd_type_cmd_tso_mss == IAVF_TX_DESC_DTYPE_CONTEXT) &&
+	    !cd_tunneling && !cd_l2tag2)
+		return;
+
+	/* grab the next descriptor */
+	context_desc = IAVF_TX_CTXTDESC(tx_ring, i);
+
+	i++;
+	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
+
+	/* cpu_to_le32 and assign to struct fields */
+	context_desc->tunneling_params = cpu_to_le32(cd_tunneling);
+	context_desc->l2tag2 = cpu_to_le16(cd_l2tag2);
+	context_desc->rsvd = cpu_to_le16(0);
+	context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
+}
+
+/**
+ * __iavf_chk_linearize - Check if there are more than 8 buffers per packet
+ * @skb:      send buffer
+ *
+ * Note: Our HW can't DMA more than 8 buffers to build a packet on the wire
+ * and so we need to figure out the cases where we need to linearize the skb.
+ *
+ * For TSO we need to count the TSO header and segment payload separately.
+ * As such we need to check cases where we have 7 fragments or more as we
+ * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for
+ * the segment payload in the first descriptor, and another 7 for the
+ * fragments.
+ **/
+bool __iavf_chk_linearize(struct sk_buff *skb)
+{
+	const skb_frag_t *frag, *stale;
+	int nr_frags, sum;
+
+	/* no need to check if number of frags is less than 7 */
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	if (nr_frags < (IAVF_MAX_BUFFER_TXD - 1))
+		return false;
+
+	/* We need to walk through the list and validate that each group
+	 * of 6 fragments totals at least gso_size.
+	 */
+	nr_frags -= IAVF_MAX_BUFFER_TXD - 2;
+	frag = &skb_shinfo(skb)->frags[0];
+
+	/* Initialize size to the negative value of gso_size minus 1.  We
+	 * use this as the worst case scenerio in which the frag ahead
+	 * of us only provides one byte which is why we are limited to 6
+	 * descriptors for a single transmit as the header and previous
+	 * fragment are already consuming 2 descriptors.
+	 */
+	sum = 1 - skb_shinfo(skb)->gso_size;
+
+	/* Add size of frags 0 through 4 to create our initial sum */
+	sum += skb_frag_size(frag++);
+	sum += skb_frag_size(frag++);
+	sum += skb_frag_size(frag++);
+	sum += skb_frag_size(frag++);
+	sum += skb_frag_size(frag++);
+
+	/* Walk through fragments adding latest fragment, testing it, and
+	 * then removing stale fragments from the sum.
+	 */
+	for (stale = &skb_shinfo(skb)->frags[0];; stale++) {
+		int stale_size = skb_frag_size(stale);
+
+		sum += skb_frag_size(frag++);
+
+		/* The stale fragment may present us with a smaller
+		 * descriptor than the actual fragment size. To account
+		 * for that we need to remove all the data on the front and
+		 * figure out what the remainder would be in the last
+		 * descriptor associated with the fragment.
+		 */
+		if (stale_size > IAVF_MAX_DATA_PER_TXD) {
+			int align_pad = -(skb_frag_off(stale)) &
+					(IAVF_MAX_READ_REQ_SIZE - 1);
+
+			sum -= align_pad;
+			stale_size -= align_pad;
+
+			do {
+				sum -= IAVF_MAX_DATA_PER_TXD_ALIGNED;
+				stale_size -= IAVF_MAX_DATA_PER_TXD_ALIGNED;
+			} while (stale_size > IAVF_MAX_DATA_PER_TXD);
+		}
+
+		/* if sum is negative we failed to make sufficient progress */
+		if (sum < 0)
+			return true;
+
+		if (!nr_frags--)
+			break;
+
+		sum -= stale_size;
+	}
+
+	return false;
+}
+
+/**
+ * __iavf_maybe_stop_tx - 2nd level check for tx stop conditions
+ * @tx_ring: the ring to be checked
+ * @size:    the size buffer we want to assure is available
+ *
+ * Returns -EBUSY if a stop is needed, else 0
+ **/
+int __iavf_maybe_stop_tx(struct iavf_ring *tx_ring, int size)
+{
+	netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
+	/* Memory barrier before checking head and tail */
+	smp_mb();
+
+	/* Check again in a case another CPU has just made room available. */
+	if (likely(IAVF_DESC_UNUSED(tx_ring) < size))
+		return -EBUSY;
+
+	/* A reprieve! - use start_queue because it doesn't call schedule */
+	netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
+	++tx_ring->tx_stats.restart_queue;
+	return 0;
+}
+
+/**
+ * iavf_tx_map - Build the Tx descriptor
+ * @tx_ring:  ring to send buffer on
+ * @skb:      send buffer
+ * @first:    first buffer info buffer to use
+ * @tx_flags: collected send information
+ * @hdr_len:  size of the packet header
+ * @td_cmd:   the command field in the descriptor
+ * @td_offset: offset for checksum or crc
+ **/
+static inline void iavf_tx_map(struct iavf_ring *tx_ring, struct sk_buff *skb,
+			       struct iavf_tx_buffer *first, u32 tx_flags,
+			       const u8 hdr_len, u32 td_cmd, u32 td_offset)
+{
+	unsigned int data_len = skb->data_len;
+	unsigned int size = skb_headlen(skb);
+	skb_frag_t *frag;
+	struct iavf_tx_buffer *tx_bi;
+	struct iavf_tx_desc *tx_desc;
+	u16 i = tx_ring->next_to_use;
+	u32 td_tag = 0;
+	dma_addr_t dma;
+
+	if (tx_flags & IAVF_TX_FLAGS_HW_VLAN) {
+		td_cmd |= IAVF_TX_DESC_CMD_IL2TAG1;
+		td_tag = (tx_flags & IAVF_TX_FLAGS_VLAN_MASK) >>
+			 IAVF_TX_FLAGS_VLAN_SHIFT;
+	}
+
+	first->tx_flags = tx_flags;
+
+	dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
+
+	tx_desc = IAVF_TX_DESC(tx_ring, i);
+	tx_bi = first;
+
+	for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
+		unsigned int max_data = IAVF_MAX_DATA_PER_TXD_ALIGNED;
+
+		if (dma_mapping_error(tx_ring->dev, dma))
+			goto dma_error;
+
+		/* record length, and DMA address */
+		dma_unmap_len_set(tx_bi, len, size);
+		dma_unmap_addr_set(tx_bi, dma, dma);
+
+		/* align size to end of page */
+		max_data += -dma & (IAVF_MAX_READ_REQ_SIZE - 1);
+		tx_desc->buffer_addr = cpu_to_le64(dma);
+
+		while (unlikely(size > IAVF_MAX_DATA_PER_TXD)) {
+			tx_desc->cmd_type_offset_bsz =
+				build_ctob(td_cmd, td_offset,
+					   max_data, td_tag);
+
+			tx_desc++;
+			i++;
+
+			if (i == tx_ring->count) {
+				tx_desc = IAVF_TX_DESC(tx_ring, 0);
+				i = 0;
+			}
+
+			dma += max_data;
+			size -= max_data;
+
+			max_data = IAVF_MAX_DATA_PER_TXD_ALIGNED;
+			tx_desc->buffer_addr = cpu_to_le64(dma);
+		}
+
+		if (likely(!data_len))
+			break;
+
+		tx_desc->cmd_type_offset_bsz = build_ctob(td_cmd, td_offset,
+							  size, td_tag);
+
+		tx_desc++;
+		i++;
+
+		if (i == tx_ring->count) {
+			tx_desc = IAVF_TX_DESC(tx_ring, 0);
+			i = 0;
+		}
+
+		size = skb_frag_size(frag);
+		data_len -= size;
+
+		dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
+				       DMA_TO_DEVICE);
+
+		tx_bi = &tx_ring->tx_bi[i];
+	}
+
+	netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);
+
+	i++;
+	if (i == tx_ring->count)
+		i = 0;
+
+	tx_ring->next_to_use = i;
+
+	iavf_maybe_stop_tx(tx_ring, DESC_NEEDED);
+
+	/* write last descriptor with RS and EOP bits */
+	td_cmd |= IAVF_TXD_CMD;
+	tx_desc->cmd_type_offset_bsz =
+			build_ctob(td_cmd, td_offset, size, td_tag);
+
+	skb_tx_timestamp(skb);
+
+	/* Force memory writes to complete before letting h/w know there
+	 * are new descriptors to fetch.
+	 *
+	 * We also use this memory barrier to make certain all of the
+	 * status bits have been updated before next_to_watch is written.
+	 */
+	wmb();
+
+	/* set next_to_watch value indicating a packet is present */
+	first->next_to_watch = tx_desc;
+
+	/* notify HW of packet */
+	if (netif_xmit_stopped(txring_txq(tx_ring)) || !netdev_xmit_more()) {
+		writel(i, tx_ring->tail);
+	}
+
+	return;
+
+dma_error:
+	dev_info(tx_ring->dev, "TX DMA map failed\n");
+
+	/* clear dma mappings for failed tx_bi map */
+	for (;;) {
+		tx_bi = &tx_ring->tx_bi[i];
+		iavf_unmap_and_free_tx_resource(tx_ring, tx_bi);
+		if (tx_bi == first)
+			break;
+		if (i == 0)
+			i = tx_ring->count;
+		i--;
+	}
+
+	tx_ring->next_to_use = i;
+}
+
+/**
+ * iavf_xmit_frame_ring - Sends buffer on Tx ring
+ * @skb:     send buffer
+ * @tx_ring: ring to send buffer on
+ *
+ * Returns NETDEV_TX_OK if sent, else an error code
+ **/
+static netdev_tx_t iavf_xmit_frame_ring(struct sk_buff *skb,
+					struct iavf_ring *tx_ring)
+{
+	u64 cd_type_cmd_tso_mss = IAVF_TX_DESC_DTYPE_CONTEXT;
+	u32 cd_tunneling = 0, cd_l2tag2 = 0;
+	struct iavf_tx_buffer *first;
+	u32 td_offset = 0;
+	u32 tx_flags = 0;
+	__be16 protocol;
+	u32 td_cmd = 0;
+	u8 hdr_len = 0;
+	int tso, count;
+
+	/* prefetch the data, we'll need it later */
+	prefetch(skb->data);
+
+	iavf_trace(xmit_frame_ring, skb, tx_ring);
+
+	count = iavf_xmit_descriptor_count(skb);
+	if (iavf_chk_linearize(skb, count)) {
+		if (__skb_linearize(skb)) {
+			dev_kfree_skb_any(skb);
+			return NETDEV_TX_OK;
+		}
+		count = iavf_txd_use_count(skb->len);
+		tx_ring->tx_stats.tx_linearize++;
+	}
+
+	/* need: 1 descriptor per page * PAGE_SIZE/IAVF_MAX_DATA_PER_TXD,
+	 *       + 1 desc for skb_head_len/IAVF_MAX_DATA_PER_TXD,
+	 *       + 4 desc gap to avoid the cache line where head is,
+	 *       + 1 desc for context descriptor,
+	 * otherwise try next time
+	 */
+	if (iavf_maybe_stop_tx(tx_ring, count + 4 + 1)) {
+		tx_ring->tx_stats.tx_busy++;
+		return NETDEV_TX_BUSY;
+	}
+
+	/* record the location of the first descriptor for this packet */
+	first = &tx_ring->tx_bi[tx_ring->next_to_use];
+	first->skb = skb;
+	first->bytecount = skb->len;
+	first->gso_segs = 1;
+
+	/* prepare the xmit flags */
+	iavf_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags);
+	if (tx_flags & IAVF_TX_FLAGS_HW_OUTER_SINGLE_VLAN) {
+		cd_type_cmd_tso_mss |= IAVF_TX_CTX_DESC_IL2TAG2 <<
+			IAVF_TXD_CTX_QW1_CMD_SHIFT;
+		cd_l2tag2 = (tx_flags & IAVF_TX_FLAGS_VLAN_MASK) >>
+			IAVF_TX_FLAGS_VLAN_SHIFT;
+	}
+
+	/* obtain protocol of skb */
+	protocol = vlan_get_protocol(skb);
+
+	/* setup IPv4/IPv6 offloads */
+	if (protocol == htons(ETH_P_IP))
+		tx_flags |= IAVF_TX_FLAGS_IPV4;
+	else if (protocol == htons(ETH_P_IPV6))
+		tx_flags |= IAVF_TX_FLAGS_IPV6;
+
+	tso = iavf_tso(first, &hdr_len, &cd_type_cmd_tso_mss);
+
+	if (tso < 0)
+		goto out_drop;
+	else if (tso)
+		tx_flags |= IAVF_TX_FLAGS_TSO;
+
+	/* Always offload the checksum, since it's in the data descriptor */
+	tso = iavf_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset,
+				  tx_ring, &cd_tunneling);
+	if (tso < 0)
+		goto out_drop;
+
+	/* always enable CRC insertion offload */
+	td_cmd |= IAVF_TX_DESC_CMD_ICRC;
+
+	iavf_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss,
+			   cd_tunneling, cd_l2tag2);
+
+	iavf_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
+		    td_cmd, td_offset);
+
+	return NETDEV_TX_OK;
+
+out_drop:
+	iavf_trace(xmit_frame_ring_drop, first->skb, tx_ring);
+	dev_kfree_skb_any(first->skb);
+	first->skb = NULL;
+	return NETDEV_TX_OK;
+}
+
+/**
+ * iavf_xmit_frame - Selects the correct VSI and Tx queue to send buffer
+ * @skb:    send buffer
+ * @netdev: network interface device structure
+ *
+ * Returns NETDEV_TX_OK if sent, else an error code
+ **/
+netdev_tx_t iavf_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct iavf_adapter *adapter = netdev_priv(netdev);
+	struct iavf_ring *tx_ring = &adapter->tx_rings[skb->queue_mapping];
+
+	/* hardware can't handle really short frames, hardware padding works
+	 * beyond this point
+	 */
+	if (unlikely(skb->len < IAVF_MIN_TX_LEN)) {
+		if (skb_pad(skb, IAVF_MIN_TX_LEN - skb->len))
+			return NETDEV_TX_OK;
+		skb->len = IAVF_MIN_TX_LEN;
+		skb_set_tail_pointer(skb, IAVF_MIN_TX_LEN);
+	}
+
+	return iavf_xmit_frame_ring(skb, tx_ring);
+}