marvell/linux/drivers/net/vmxnet3/vmxnet3_drv.c

/*
 * Linux driver for VMware's vmxnet3 ethernet NIC.
 *
 * Copyright (C) 2008-2016, VMware, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; version 2 of the License and no later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Maintained by: pv-drivers@vmware.com
 *
 */

#include <linux/module.h>
#include <net/ip6_checksum.h>

#include "vmxnet3_int.h"

char vmxnet3_driver_name[] = "vmxnet3";
#define VMXNET3_DRIVER_DESC "VMware vmxnet3 virtual NIC driver"

/*
 * PCI Device ID Table
 * Last entry must be all 0s
 */
static const struct pci_device_id vmxnet3_pciid_table[] = {
	{PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_VMXNET3)},
	{0}
};

MODULE_DEVICE_TABLE(pci, vmxnet3_pciid_table);

static int enable_mq = 1;

static void
vmxnet3_write_mac_addr(struct vmxnet3_adapter *adapter, u8 *mac);

/*
 *    Enable/Disable the given intr
 */
static void
vmxnet3_enable_intr(struct vmxnet3_adapter *adapter, unsigned intr_idx)
{
	VMXNET3_WRITE_BAR0_REG(adapter, VMXNET3_REG_IMR + intr_idx * 8, 0);
}


static void
vmxnet3_disable_intr(struct vmxnet3_adapter *adapter, unsigned intr_idx)
{
	VMXNET3_WRITE_BAR0_REG(adapter, VMXNET3_REG_IMR + intr_idx * 8, 1);
}


/*
 *    Enable/Disable all intrs used by the device
 */
static void
vmxnet3_enable_all_intrs(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->intr.num_intrs; i++)
		vmxnet3_enable_intr(adapter, i);
	adapter->shared->devRead.intrConf.intrCtrl &=
					cpu_to_le32(~VMXNET3_IC_DISABLE_ALL);
}


static void
vmxnet3_disable_all_intrs(struct vmxnet3_adapter *adapter)
{
	int i;

	adapter->shared->devRead.intrConf.intrCtrl |=
					cpu_to_le32(VMXNET3_IC_DISABLE_ALL);
	for (i = 0; i < adapter->intr.num_intrs; i++)
		vmxnet3_disable_intr(adapter, i);
}


static void
vmxnet3_ack_events(struct vmxnet3_adapter *adapter, u32 events)
{
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_ECR, events);
}


static bool
vmxnet3_tq_stopped(struct vmxnet3_tx_queue *tq, struct vmxnet3_adapter *adapter)
{
	return tq->stopped;
}


static void
vmxnet3_tq_start(struct vmxnet3_tx_queue *tq, struct vmxnet3_adapter *adapter)
{
	tq->stopped = false;
	netif_start_subqueue(adapter->netdev, tq - adapter->tx_queue);
}


static void
vmxnet3_tq_wake(struct vmxnet3_tx_queue *tq, struct vmxnet3_adapter *adapter)
{
	tq->stopped = false;
	netif_wake_subqueue(adapter->netdev, (tq - adapter->tx_queue));
}


static void
vmxnet3_tq_stop(struct vmxnet3_tx_queue *tq, struct vmxnet3_adapter *adapter)
{
	tq->stopped = true;
	tq->num_stop++;
	netif_stop_subqueue(adapter->netdev, (tq - adapter->tx_queue));
}


/*
 * Check the link state. This may start or stop the tx queue.
 */
static void
vmxnet3_check_link(struct vmxnet3_adapter *adapter, bool affectTxQueue)
{
	u32 ret;
	int i;
	unsigned long flags;

	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD, VMXNET3_CMD_GET_LINK);
	ret = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);

	adapter->link_speed = ret >> 16;
	if (ret & 1) { /* Link is up. */
		netdev_info(adapter->netdev, "NIC Link is Up %d Mbps\n",
			    adapter->link_speed);
		netif_carrier_on(adapter->netdev);

		if (affectTxQueue) {
			for (i = 0; i < adapter->num_tx_queues; i++)
				vmxnet3_tq_start(&adapter->tx_queue[i],
						 adapter);
		}
	} else {
		netdev_info(adapter->netdev, "NIC Link is Down\n");
		netif_carrier_off(adapter->netdev);

		if (affectTxQueue) {
			for (i = 0; i < adapter->num_tx_queues; i++)
				vmxnet3_tq_stop(&adapter->tx_queue[i], adapter);
		}
	}
}

static void
vmxnet3_process_events(struct vmxnet3_adapter *adapter)
{
	int i;
	unsigned long flags;
	u32 events = le32_to_cpu(adapter->shared->ecr);
	if (!events)
		return;

	vmxnet3_ack_events(adapter, events);

	/* Check if link state has changed */
	if (events & VMXNET3_ECR_LINK)
		vmxnet3_check_link(adapter, true);

	/* Check if there is an error on xmit/recv queues */
	if (events & (VMXNET3_ECR_TQERR | VMXNET3_ECR_RQERR)) {
		spin_lock_irqsave(&adapter->cmd_lock, flags);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_GET_QUEUE_STATUS);
		spin_unlock_irqrestore(&adapter->cmd_lock, flags);

		for (i = 0; i < adapter->num_tx_queues; i++)
			if (adapter->tqd_start[i].status.stopped)
				dev_err(&adapter->netdev->dev,
					"%s: tq[%d] error 0x%x\n",
					adapter->netdev->name, i, le32_to_cpu(
					adapter->tqd_start[i].status.error));
		for (i = 0; i < adapter->num_rx_queues; i++)
			if (adapter->rqd_start[i].status.stopped)
				dev_err(&adapter->netdev->dev,
					"%s: rq[%d] error 0x%x\n",
					adapter->netdev->name, i,
					adapter->rqd_start[i].status.error);

		schedule_work(&adapter->work);
	}
}

#ifdef __BIG_ENDIAN_BITFIELD
/*
 * The device expects the bitfields in shared structures to be written in
 * little endian. When CPU is big endian, the following routines are used to
 * correctly read and write into ABI.
 * The general technique used here is : double word bitfields are defined in
 * opposite order for big endian architecture. Then before reading them in
 * driver the complete double word is translated using le32_to_cpu. Similarly
 * After the driver writes into bitfields, cpu_to_le32 is used to translate the
 * double words into required format.
 * In order to avoid touching bits in shared structure more than once, temporary
 * descriptors are used. These are passed as srcDesc to following functions.
 */
static void vmxnet3_RxDescToCPU(const struct Vmxnet3_RxDesc *srcDesc,
				struct Vmxnet3_RxDesc *dstDesc)
{
	u32 *src = (u32 *)srcDesc + 2;
	u32 *dst = (u32 *)dstDesc + 2;
	dstDesc->addr = le64_to_cpu(srcDesc->addr);
	*dst = le32_to_cpu(*src);
	dstDesc->ext1 = le32_to_cpu(srcDesc->ext1);
}

static void vmxnet3_TxDescToLe(const struct Vmxnet3_TxDesc *srcDesc,
			       struct Vmxnet3_TxDesc *dstDesc)
{
	int i;
	u32 *src = (u32 *)(srcDesc + 1);
	u32 *dst = (u32 *)(dstDesc + 1);

	/* Working backwards so that the gen bit is set at the end. */
	for (i = 2; i > 0; i--) {
		src--;
		dst--;
		*dst = cpu_to_le32(*src);
	}
}


static void vmxnet3_RxCompToCPU(const struct Vmxnet3_RxCompDesc *srcDesc,
				struct Vmxnet3_RxCompDesc *dstDesc)
{
	int i = 0;
	u32 *src = (u32 *)srcDesc;
	u32 *dst = (u32 *)dstDesc;
	for (i = 0; i < sizeof(struct Vmxnet3_RxCompDesc) / sizeof(u32); i++) {
		*dst = le32_to_cpu(*src);
		src++;
		dst++;
	}
}


/* Used to read bitfield values from double words. */
static u32 get_bitfield32(const __le32 *bitfield, u32 pos, u32 size)
{
	u32 temp = le32_to_cpu(*bitfield);
	u32 mask = ((1 << size) - 1) << pos;
	temp &= mask;
	temp >>= pos;
	return temp;
}



#endif  /* __BIG_ENDIAN_BITFIELD */

#ifdef __BIG_ENDIAN_BITFIELD

#   define VMXNET3_TXDESC_GET_GEN(txdesc) get_bitfield32(((const __le32 *) \
			txdesc) + VMXNET3_TXD_GEN_DWORD_SHIFT, \
			VMXNET3_TXD_GEN_SHIFT, VMXNET3_TXD_GEN_SIZE)
#   define VMXNET3_TXDESC_GET_EOP(txdesc) get_bitfield32(((const __le32 *) \
			txdesc) + VMXNET3_TXD_EOP_DWORD_SHIFT, \
			VMXNET3_TXD_EOP_SHIFT, VMXNET3_TXD_EOP_SIZE)
#   define VMXNET3_TCD_GET_GEN(tcd) get_bitfield32(((const __le32 *)tcd) + \
			VMXNET3_TCD_GEN_DWORD_SHIFT, VMXNET3_TCD_GEN_SHIFT, \
			VMXNET3_TCD_GEN_SIZE)
#   define VMXNET3_TCD_GET_TXIDX(tcd) get_bitfield32((const __le32 *)tcd, \
			VMXNET3_TCD_TXIDX_SHIFT, VMXNET3_TCD_TXIDX_SIZE)
#   define vmxnet3_getRxComp(dstrcd, rcd, tmp) do { \
			(dstrcd) = (tmp); \
			vmxnet3_RxCompToCPU((rcd), (tmp)); \
		} while (0)
#   define vmxnet3_getRxDesc(dstrxd, rxd, tmp) do { \
			(dstrxd) = (tmp); \
			vmxnet3_RxDescToCPU((rxd), (tmp)); \
		} while (0)

#else

#   define VMXNET3_TXDESC_GET_GEN(txdesc) ((txdesc)->gen)
#   define VMXNET3_TXDESC_GET_EOP(txdesc) ((txdesc)->eop)
#   define VMXNET3_TCD_GET_GEN(tcd) ((tcd)->gen)
#   define VMXNET3_TCD_GET_TXIDX(tcd) ((tcd)->txdIdx)
#   define vmxnet3_getRxComp(dstrcd, rcd, tmp) (dstrcd) = (rcd)
#   define vmxnet3_getRxDesc(dstrxd, rxd, tmp) (dstrxd) = (rxd)

#endif /* __BIG_ENDIAN_BITFIELD  */


static void
vmxnet3_unmap_tx_buf(struct vmxnet3_tx_buf_info *tbi,
		     struct pci_dev *pdev)
{
	if (tbi->map_type == VMXNET3_MAP_SINGLE)
		dma_unmap_single(&pdev->dev, tbi->dma_addr, tbi->len,
				 PCI_DMA_TODEVICE);
	else if (tbi->map_type == VMXNET3_MAP_PAGE)
		dma_unmap_page(&pdev->dev, tbi->dma_addr, tbi->len,
			       PCI_DMA_TODEVICE);
	else
		BUG_ON(tbi->map_type != VMXNET3_MAP_NONE);

	tbi->map_type = VMXNET3_MAP_NONE; /* to help debugging */
}


static int
vmxnet3_unmap_pkt(u32 eop_idx, struct vmxnet3_tx_queue *tq,
		  struct pci_dev *pdev,	struct vmxnet3_adapter *adapter)
{
	struct sk_buff *skb;
	int entries = 0;

	/* no out of order completion */
	BUG_ON(tq->buf_info[eop_idx].sop_idx != tq->tx_ring.next2comp);
	BUG_ON(VMXNET3_TXDESC_GET_EOP(&(tq->tx_ring.base[eop_idx].txd)) != 1);

	skb = tq->buf_info[eop_idx].skb;
	BUG_ON(skb == NULL);
	tq->buf_info[eop_idx].skb = NULL;

	VMXNET3_INC_RING_IDX_ONLY(eop_idx, tq->tx_ring.size);

	while (tq->tx_ring.next2comp != eop_idx) {
		vmxnet3_unmap_tx_buf(tq->buf_info + tq->tx_ring.next2comp,
				     pdev);

		/* update next2comp w/o tx_lock. Since we are marking more,
		 * instead of less, tx ring entries avail, the worst case is
		 * that the tx routine incorrectly re-queues a pkt due to
		 * insufficient tx ring entries.
		 */
		vmxnet3_cmd_ring_adv_next2comp(&tq->tx_ring);
		entries++;
	}

	dev_kfree_skb_any(skb);
	return entries;
}


static int
vmxnet3_tq_tx_complete(struct vmxnet3_tx_queue *tq,
			struct vmxnet3_adapter *adapter)
{
	int completed = 0;
	union Vmxnet3_GenericDesc *gdesc;

	gdesc = tq->comp_ring.base + tq->comp_ring.next2proc;
	while (VMXNET3_TCD_GET_GEN(&gdesc->tcd) == tq->comp_ring.gen) {
		/* Prevent any &gdesc->tcd field from being (speculatively)
		 * read before (&gdesc->tcd)->gen is read.
		 */
		dma_rmb();

		completed += vmxnet3_unmap_pkt(VMXNET3_TCD_GET_TXIDX(
					       &gdesc->tcd), tq, adapter->pdev,
					       adapter);

		vmxnet3_comp_ring_adv_next2proc(&tq->comp_ring);
		gdesc = tq->comp_ring.base + tq->comp_ring.next2proc;
	}

	if (completed) {
		spin_lock(&tq->tx_lock);
		if (unlikely(vmxnet3_tq_stopped(tq, adapter) &&
			     vmxnet3_cmd_ring_desc_avail(&tq->tx_ring) >
			     VMXNET3_WAKE_QUEUE_THRESHOLD(tq) &&
			     netif_carrier_ok(adapter->netdev))) {
			vmxnet3_tq_wake(tq, adapter);
		}
		spin_unlock(&tq->tx_lock);
	}
	return completed;
}


static void
vmxnet3_tq_cleanup(struct vmxnet3_tx_queue *tq,
		   struct vmxnet3_adapter *adapter)
{
	int i;

	while (tq->tx_ring.next2comp != tq->tx_ring.next2fill) {
		struct vmxnet3_tx_buf_info *tbi;

		tbi = tq->buf_info + tq->tx_ring.next2comp;

		vmxnet3_unmap_tx_buf(tbi, adapter->pdev);
		if (tbi->skb) {
			dev_kfree_skb_any(tbi->skb);
			tbi->skb = NULL;
		}
		vmxnet3_cmd_ring_adv_next2comp(&tq->tx_ring);
	}

	/* sanity check, verify all buffers are indeed unmapped and freed */
	for (i = 0; i < tq->tx_ring.size; i++) {
		BUG_ON(tq->buf_info[i].skb != NULL ||
		       tq->buf_info[i].map_type != VMXNET3_MAP_NONE);
	}

	tq->tx_ring.gen = VMXNET3_INIT_GEN;
	tq->tx_ring.next2fill = tq->tx_ring.next2comp = 0;

	tq->comp_ring.gen = VMXNET3_INIT_GEN;
	tq->comp_ring.next2proc = 0;
}


static void
vmxnet3_tq_destroy(struct vmxnet3_tx_queue *tq,
		   struct vmxnet3_adapter *adapter)
{
	if (tq->tx_ring.base) {
		dma_free_coherent(&adapter->pdev->dev, tq->tx_ring.size *
				  sizeof(struct Vmxnet3_TxDesc),
				  tq->tx_ring.base, tq->tx_ring.basePA);
		tq->tx_ring.base = NULL;
	}
	if (tq->data_ring.base) {
		dma_free_coherent(&adapter->pdev->dev,
				  tq->data_ring.size * tq->txdata_desc_size,
				  tq->data_ring.base, tq->data_ring.basePA);
		tq->data_ring.base = NULL;
	}
	if (tq->comp_ring.base) {
		dma_free_coherent(&adapter->pdev->dev, tq->comp_ring.size *
				  sizeof(struct Vmxnet3_TxCompDesc),
				  tq->comp_ring.base, tq->comp_ring.basePA);
		tq->comp_ring.base = NULL;
	}
	if (tq->buf_info) {
		dma_free_coherent(&adapter->pdev->dev,
				  tq->tx_ring.size * sizeof(tq->buf_info[0]),
				  tq->buf_info, tq->buf_info_pa);
		tq->buf_info = NULL;
	}
}


/* Destroy all tx queues */
void
vmxnet3_tq_destroy_all(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_tx_queues; i++)
		vmxnet3_tq_destroy(&adapter->tx_queue[i], adapter);
}


static void
vmxnet3_tq_init(struct vmxnet3_tx_queue *tq,
		struct vmxnet3_adapter *adapter)
{
	int i;

	/* reset the tx ring contents to 0 and reset the tx ring states */
	memset(tq->tx_ring.base, 0, tq->tx_ring.size *
	       sizeof(struct Vmxnet3_TxDesc));
	tq->tx_ring.next2fill = tq->tx_ring.next2comp = 0;
	tq->tx_ring.gen = VMXNET3_INIT_GEN;

	memset(tq->data_ring.base, 0,
	       tq->data_ring.size * tq->txdata_desc_size);

	/* reset the tx comp ring contents to 0 and reset comp ring states */
	memset(tq->comp_ring.base, 0, tq->comp_ring.size *
	       sizeof(struct Vmxnet3_TxCompDesc));
	tq->comp_ring.next2proc = 0;
	tq->comp_ring.gen = VMXNET3_INIT_GEN;

	/* reset the bookkeeping data */
	memset(tq->buf_info, 0, sizeof(tq->buf_info[0]) * tq->tx_ring.size);
	for (i = 0; i < tq->tx_ring.size; i++)
		tq->buf_info[i].map_type = VMXNET3_MAP_NONE;

	/* stats are not reset */
}


static int
vmxnet3_tq_create(struct vmxnet3_tx_queue *tq,
		  struct vmxnet3_adapter *adapter)
{
	size_t sz;

	BUG_ON(tq->tx_ring.base || tq->data_ring.base ||
	       tq->comp_ring.base || tq->buf_info);

	tq->tx_ring.base = dma_alloc_coherent(&adapter->pdev->dev,
			tq->tx_ring.size * sizeof(struct Vmxnet3_TxDesc),
			&tq->tx_ring.basePA, GFP_KERNEL);
	if (!tq->tx_ring.base) {
		netdev_err(adapter->netdev, "failed to allocate tx ring\n");
		goto err;
	}

	tq->data_ring.base = dma_alloc_coherent(&adapter->pdev->dev,
			tq->data_ring.size * tq->txdata_desc_size,
			&tq->data_ring.basePA, GFP_KERNEL);
	if (!tq->data_ring.base) {
		netdev_err(adapter->netdev, "failed to allocate tx data ring\n");
		goto err;
	}

	tq->comp_ring.base = dma_alloc_coherent(&adapter->pdev->dev,
			tq->comp_ring.size * sizeof(struct Vmxnet3_TxCompDesc),
			&tq->comp_ring.basePA, GFP_KERNEL);
	if (!tq->comp_ring.base) {
		netdev_err(adapter->netdev, "failed to allocate tx comp ring\n");
		goto err;
	}

	sz = tq->tx_ring.size * sizeof(tq->buf_info[0]);
	tq->buf_info = dma_alloc_coherent(&adapter->pdev->dev, sz,
					  &tq->buf_info_pa, GFP_KERNEL);
	if (!tq->buf_info)
		goto err;

	return 0;

err:
	vmxnet3_tq_destroy(tq, adapter);
	return -ENOMEM;
}

static void
vmxnet3_tq_cleanup_all(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_tx_queues; i++)
		vmxnet3_tq_cleanup(&adapter->tx_queue[i], adapter);
}

/*
 *    starting from ring->next2fill, allocate rx buffers for the given ring
 *    of the rx queue and update the rx desc. stop after @num_to_alloc buffers
 *    are allocated or allocation fails
 */

static int
vmxnet3_rq_alloc_rx_buf(struct vmxnet3_rx_queue *rq, u32 ring_idx,
			int num_to_alloc, struct vmxnet3_adapter *adapter)
{
	int num_allocated = 0;
	struct vmxnet3_rx_buf_info *rbi_base = rq->buf_info[ring_idx];
	struct vmxnet3_cmd_ring *ring = &rq->rx_ring[ring_idx];
	u32 val;

	while (num_allocated <= num_to_alloc) {
		struct vmxnet3_rx_buf_info *rbi;
		union Vmxnet3_GenericDesc *gd;

		rbi = rbi_base + ring->next2fill;
		gd = ring->base + ring->next2fill;

		if (rbi->buf_type == VMXNET3_RX_BUF_SKB) {
			if (rbi->skb == NULL) {
				rbi->skb = __netdev_alloc_skb_ip_align(adapter->netdev,
								       rbi->len,
								       GFP_KERNEL);
				if (unlikely(rbi->skb == NULL)) {
					rq->stats.rx_buf_alloc_failure++;
					break;
				}

				rbi->dma_addr = dma_map_single(
						&adapter->pdev->dev,
						rbi->skb->data, rbi->len,
						PCI_DMA_FROMDEVICE);
				if (dma_mapping_error(&adapter->pdev->dev,
						      rbi->dma_addr)) {
					dev_kfree_skb_any(rbi->skb);
					rbi->skb = NULL;
					rq->stats.rx_buf_alloc_failure++;
					break;
				}
			} else {
				/* rx buffer skipped by the device */
			}
			val = VMXNET3_RXD_BTYPE_HEAD << VMXNET3_RXD_BTYPE_SHIFT;
		} else {
			BUG_ON(rbi->buf_type != VMXNET3_RX_BUF_PAGE ||
			       rbi->len  != PAGE_SIZE);

			if (rbi->page == NULL) {
				rbi->page = alloc_page(GFP_ATOMIC);
				if (unlikely(rbi->page == NULL)) {
					rq->stats.rx_buf_alloc_failure++;
					break;
				}
				rbi->dma_addr = dma_map_page(
						&adapter->pdev->dev,
						rbi->page, 0, PAGE_SIZE,
						PCI_DMA_FROMDEVICE);
				if (dma_mapping_error(&adapter->pdev->dev,
						      rbi->dma_addr)) {
					put_page(rbi->page);
					rbi->page = NULL;
					rq->stats.rx_buf_alloc_failure++;
					break;
				}
			} else {
				/* rx buffers skipped by the device */
			}
			val = VMXNET3_RXD_BTYPE_BODY << VMXNET3_RXD_BTYPE_SHIFT;
		}

		gd->rxd.addr = cpu_to_le64(rbi->dma_addr);
		gd->dword[2] = cpu_to_le32((!ring->gen << VMXNET3_RXD_GEN_SHIFT)
					   | val | rbi->len);

		/* Fill the last buffer but dont mark it ready, or else the
		 * device will think that the queue is full */
		if (num_allocated == num_to_alloc)
			break;

		gd->dword[2] |= cpu_to_le32(ring->gen << VMXNET3_RXD_GEN_SHIFT);
		num_allocated++;
		vmxnet3_cmd_ring_adv_next2fill(ring);
	}

	netdev_dbg(adapter->netdev,
		"alloc_rx_buf: %d allocated, next2fill %u, next2comp %u\n",
		num_allocated, ring->next2fill, ring->next2comp);

	/* so that the device can distinguish a full ring and an empty ring */
	BUG_ON(num_allocated != 0 && ring->next2fill == ring->next2comp);

	return num_allocated;
}


static void
vmxnet3_append_frag(struct sk_buff *skb, struct Vmxnet3_RxCompDesc *rcd,
		    struct vmxnet3_rx_buf_info *rbi)
{
	skb_frag_t *frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;

	BUG_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS);

	__skb_frag_set_page(frag, rbi->page);
	skb_frag_off_set(frag, 0);
	skb_frag_size_set(frag, rcd->len);
	skb->data_len += rcd->len;
	skb->truesize += PAGE_SIZE;
	skb_shinfo(skb)->nr_frags++;
}


static int
vmxnet3_map_pkt(struct sk_buff *skb, struct vmxnet3_tx_ctx *ctx,
		struct vmxnet3_tx_queue *tq, struct pci_dev *pdev,
		struct vmxnet3_adapter *adapter)
{
	u32 dw2, len;
	unsigned long buf_offset;
	int i;
	union Vmxnet3_GenericDesc *gdesc;
	struct vmxnet3_tx_buf_info *tbi = NULL;

	BUG_ON(ctx->copy_size > skb_headlen(skb));

	/* use the previous gen bit for the SOP desc */
	dw2 = (tq->tx_ring.gen ^ 0x1) << VMXNET3_TXD_GEN_SHIFT;

	ctx->sop_txd = tq->tx_ring.base + tq->tx_ring.next2fill;
	gdesc = ctx->sop_txd; /* both loops below can be skipped */

	/* no need to map the buffer if headers are copied */
	if (ctx->copy_size) {
		ctx->sop_txd->txd.addr = cpu_to_le64(tq->data_ring.basePA +
					tq->tx_ring.next2fill *
					tq->txdata_desc_size);
		ctx->sop_txd->dword[2] = cpu_to_le32(dw2 | ctx->copy_size);
		ctx->sop_txd->dword[3] = 0;

		tbi = tq->buf_info + tq->tx_ring.next2fill;
		tbi->map_type = VMXNET3_MAP_NONE;

		netdev_dbg(adapter->netdev,
			"txd[%u]: 0x%Lx 0x%x 0x%x\n",
			tq->tx_ring.next2fill,
			le64_to_cpu(ctx->sop_txd->txd.addr),
			ctx->sop_txd->dword[2], ctx->sop_txd->dword[3]);
		vmxnet3_cmd_ring_adv_next2fill(&tq->tx_ring);

		/* use the right gen for non-SOP desc */
		dw2 = tq->tx_ring.gen << VMXNET3_TXD_GEN_SHIFT;
	}

	/* linear part can use multiple tx desc if it's big */
	len = skb_headlen(skb) - ctx->copy_size;
	buf_offset = ctx->copy_size;
	while (len) {
		u32 buf_size;

		if (len < VMXNET3_MAX_TX_BUF_SIZE) {
			buf_size = len;
			dw2 |= len;
		} else {
			buf_size = VMXNET3_MAX_TX_BUF_SIZE;
			/* spec says that for TxDesc.len, 0 == 2^14 */
		}

		tbi = tq->buf_info + tq->tx_ring.next2fill;
		tbi->map_type = VMXNET3_MAP_SINGLE;
		tbi->dma_addr = dma_map_single(&adapter->pdev->dev,
				skb->data + buf_offset, buf_size,
				PCI_DMA_TODEVICE);
		if (dma_mapping_error(&adapter->pdev->dev, tbi->dma_addr))
			return -EFAULT;

		tbi->len = buf_size;

		gdesc = tq->tx_ring.base + tq->tx_ring.next2fill;
		BUG_ON(gdesc->txd.gen == tq->tx_ring.gen);

		gdesc->txd.addr = cpu_to_le64(tbi->dma_addr);
		gdesc->dword[2] = cpu_to_le32(dw2);
		gdesc->dword[3] = 0;

		netdev_dbg(adapter->netdev,
			"txd[%u]: 0x%Lx 0x%x 0x%x\n",
			tq->tx_ring.next2fill, le64_to_cpu(gdesc->txd.addr),
			le32_to_cpu(gdesc->dword[2]), gdesc->dword[3]);
		vmxnet3_cmd_ring_adv_next2fill(&tq->tx_ring);
		dw2 = tq->tx_ring.gen << VMXNET3_TXD_GEN_SHIFT;

		len -= buf_size;
		buf_offset += buf_size;
	}

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		u32 buf_size;

		buf_offset = 0;
		len = skb_frag_size(frag);
		while (len) {
			tbi = tq->buf_info + tq->tx_ring.next2fill;
			if (len < VMXNET3_MAX_TX_BUF_SIZE) {
				buf_size = len;
				dw2 |= len;
			} else {
				buf_size = VMXNET3_MAX_TX_BUF_SIZE;
				/* spec says that for TxDesc.len, 0 == 2^14 */
			}
			tbi->map_type = VMXNET3_MAP_PAGE;
			tbi->dma_addr = skb_frag_dma_map(&adapter->pdev->dev, frag,
							 buf_offset, buf_size,
							 DMA_TO_DEVICE);
			if (dma_mapping_error(&adapter->pdev->dev, tbi->dma_addr))
				return -EFAULT;

			tbi->len = buf_size;

			gdesc = tq->tx_ring.base + tq->tx_ring.next2fill;
			BUG_ON(gdesc->txd.gen == tq->tx_ring.gen);

			gdesc->txd.addr = cpu_to_le64(tbi->dma_addr);
			gdesc->dword[2] = cpu_to_le32(dw2);
			gdesc->dword[3] = 0;

			netdev_dbg(adapter->netdev,
				"txd[%u]: 0x%llx %u %u\n",
				tq->tx_ring.next2fill, le64_to_cpu(gdesc->txd.addr),
				le32_to_cpu(gdesc->dword[2]), gdesc->dword[3]);
			vmxnet3_cmd_ring_adv_next2fill(&tq->tx_ring);
			dw2 = tq->tx_ring.gen << VMXNET3_TXD_GEN_SHIFT;

			len -= buf_size;
			buf_offset += buf_size;
		}
	}

	ctx->eop_txd = gdesc;

	/* set the last buf_info for the pkt */
	tbi->skb = skb;
	tbi->sop_idx = ctx->sop_txd - tq->tx_ring.base;

	return 0;
}


/* Init all tx queues */
static void
vmxnet3_tq_init_all(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_tx_queues; i++)
		vmxnet3_tq_init(&adapter->tx_queue[i], adapter);
}


/*
 *    parse relevant protocol headers:
 *      For a tso pkt, relevant headers are L2/3/4 including options
 *      For a pkt requesting csum offloading, they are L2/3 and may include L4
 *      if it's a TCP/UDP pkt
 *
 * Returns:
 *    -1:  error happens during parsing
 *     0:  protocol headers parsed, but too big to be copied
 *     1:  protocol headers parsed and copied
 *
 * Other effects:
 *    1. related *ctx fields are updated.
 *    2. ctx->copy_size is # of bytes copied
 *    3. the portion to be copied is guaranteed to be in the linear part
 *
 */
static int
vmxnet3_parse_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
		  struct vmxnet3_tx_ctx *ctx,
		  struct vmxnet3_adapter *adapter)
{
	u8 protocol = 0;

	if (ctx->mss) {	/* TSO */
		ctx->eth_ip_hdr_size = skb_transport_offset(skb);
		ctx->l4_hdr_size = tcp_hdrlen(skb);
		ctx->copy_size = ctx->eth_ip_hdr_size + ctx->l4_hdr_size;
	} else {
		if (skb->ip_summed == CHECKSUM_PARTIAL) {
			ctx->eth_ip_hdr_size = skb_checksum_start_offset(skb);

			if (ctx->ipv4) {
				const struct iphdr *iph = ip_hdr(skb);

				protocol = iph->protocol;
			} else if (ctx->ipv6) {
				const struct ipv6hdr *ipv6h = ipv6_hdr(skb);

				protocol = ipv6h->nexthdr;
			}

			switch (protocol) {
			case IPPROTO_TCP:
				ctx->l4_hdr_size = skb->encapsulation ? inner_tcp_hdrlen(skb) :
						   tcp_hdrlen(skb);
				break;
			case IPPROTO_UDP:
				ctx->l4_hdr_size = sizeof(struct udphdr);
				break;
			default:
				ctx->l4_hdr_size = 0;
				break;
			}

			ctx->copy_size = min(ctx->eth_ip_hdr_size +
					 ctx->l4_hdr_size, skb->len);
		} else {
			ctx->eth_ip_hdr_size = 0;
			ctx->l4_hdr_size = 0;
			/* copy as much as allowed */
			ctx->copy_size = min_t(unsigned int,
					       tq->txdata_desc_size,
					       skb_headlen(skb));
		}

		if (skb->len <= VMXNET3_HDR_COPY_SIZE)
			ctx->copy_size = skb->len;

		/* make sure headers are accessible directly */
		if (unlikely(!pskb_may_pull(skb, ctx->copy_size)))
			goto err;
	}

	if (unlikely(ctx->copy_size > tq->txdata_desc_size)) {
		tq->stats.oversized_hdr++;
		ctx->copy_size = 0;
		return 0;
	}

	return 1;
err:
	return -1;
}

/*
 *    copy relevant protocol headers to the transmit ring:
 *      For a tso pkt, relevant headers are L2/3/4 including options
 *      For a pkt requesting csum offloading, they are L2/3 and may include L4
 *      if it's a TCP/UDP pkt
 *
 *
 *    Note that this requires that vmxnet3_parse_hdr be called first to set the
 *      appropriate bits in ctx first
 */
static void
vmxnet3_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
		 struct vmxnet3_tx_ctx *ctx,
		 struct vmxnet3_adapter *adapter)
{
	struct Vmxnet3_TxDataDesc *tdd;

	tdd = (struct Vmxnet3_TxDataDesc *)((u8 *)tq->data_ring.base +
					    tq->tx_ring.next2fill *
					    tq->txdata_desc_size);

	memcpy(tdd->data, skb->data, ctx->copy_size);
	netdev_dbg(adapter->netdev,
		"copy %u bytes to dataRing[%u]\n",
		ctx->copy_size, tq->tx_ring.next2fill);
}


static void
vmxnet3_prepare_tso(struct sk_buff *skb,
		    struct vmxnet3_tx_ctx *ctx)
{
	struct tcphdr *tcph = tcp_hdr(skb);

	if (ctx->ipv4) {
		struct iphdr *iph = ip_hdr(skb);

		iph->check = 0;
		tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, 0,
						 IPPROTO_TCP, 0);
	} else if (ctx->ipv6) {
		struct ipv6hdr *iph = ipv6_hdr(skb);

		tcph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, 0,
					       IPPROTO_TCP, 0);
	}
}

static int txd_estimate(const struct sk_buff *skb)
{
	int count = VMXNET3_TXD_NEEDED(skb_headlen(skb)) + 1;
	int i;

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

		count += VMXNET3_TXD_NEEDED(skb_frag_size(frag));
	}
	return count;
}

/*
 * Transmits a pkt thru a given tq
 * Returns:
 *    NETDEV_TX_OK:      descriptors are setup successfully
 *    NETDEV_TX_OK:      error occurred, the pkt is dropped
 *    NETDEV_TX_BUSY:    tx ring is full, queue is stopped
 *
 * Side-effects:
 *    1. tx ring may be changed
 *    2. tq stats may be updated accordingly
 *    3. shared->txNumDeferred may be updated
 */

static int
vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
		struct vmxnet3_adapter *adapter, struct net_device *netdev)
{
	int ret;
	u32 count;
	int num_pkts;
	int tx_num_deferred;
	unsigned long flags;
	struct vmxnet3_tx_ctx ctx;
	union Vmxnet3_GenericDesc *gdesc;
#ifdef __BIG_ENDIAN_BITFIELD
	/* Use temporary descriptor to avoid touching bits multiple times */
	union Vmxnet3_GenericDesc tempTxDesc;
#endif

	count = txd_estimate(skb);

	ctx.ipv4 = (vlan_get_protocol(skb) == cpu_to_be16(ETH_P_IP));
	ctx.ipv6 = (vlan_get_protocol(skb) == cpu_to_be16(ETH_P_IPV6));

	ctx.mss = skb_shinfo(skb)->gso_size;
	if (ctx.mss) {
		if (skb_header_cloned(skb)) {
			if (unlikely(pskb_expand_head(skb, 0, 0,
						      GFP_ATOMIC) != 0)) {
				tq->stats.drop_tso++;
				goto drop_pkt;
			}
			tq->stats.copy_skb_header++;
		}
		vmxnet3_prepare_tso(skb, &ctx);
	} else {
		if (unlikely(count > VMXNET3_MAX_TXD_PER_PKT)) {

			/* non-tso pkts must not use more than
			 * VMXNET3_MAX_TXD_PER_PKT entries
			 */
			if (skb_linearize(skb) != 0) {
				tq->stats.drop_too_many_frags++;
				goto drop_pkt;
			}
			tq->stats.linearized++;

			/* recalculate the # of descriptors to use */
			count = VMXNET3_TXD_NEEDED(skb_headlen(skb)) + 1;
		}
	}

	ret = vmxnet3_parse_hdr(skb, tq, &ctx, adapter);
	if (ret >= 0) {
		BUG_ON(ret <= 0 && ctx.copy_size != 0);
		/* hdrs parsed, check against other limits */
		if (ctx.mss) {
			if (unlikely(ctx.eth_ip_hdr_size + ctx.l4_hdr_size >
				     VMXNET3_MAX_TX_BUF_SIZE)) {
				tq->stats.drop_oversized_hdr++;
				goto drop_pkt;
			}
		} else {
			if (skb->ip_summed == CHECKSUM_PARTIAL) {
				if (unlikely(ctx.eth_ip_hdr_size +
					     skb->csum_offset >
					     VMXNET3_MAX_CSUM_OFFSET)) {
					tq->stats.drop_oversized_hdr++;
					goto drop_pkt;
				}
			}
		}
	} else {
		tq->stats.drop_hdr_inspect_err++;
		goto drop_pkt;
	}

	spin_lock_irqsave(&tq->tx_lock, flags);

	if (count > vmxnet3_cmd_ring_desc_avail(&tq->tx_ring)) {
		tq->stats.tx_ring_full++;
		netdev_dbg(adapter->netdev,
			"tx queue stopped on %s, next2comp %u"
			" next2fill %u\n", adapter->netdev->name,
			tq->tx_ring.next2comp, tq->tx_ring.next2fill);

		vmxnet3_tq_stop(tq, adapter);
		spin_unlock_irqrestore(&tq->tx_lock, flags);
		return NETDEV_TX_BUSY;
	}


	vmxnet3_copy_hdr(skb, tq, &ctx, adapter);

	/* fill tx descs related to addr & len */
	if (vmxnet3_map_pkt(skb, &ctx, tq, adapter->pdev, adapter))
		goto unlock_drop_pkt;

	/* setup the EOP desc */
	ctx.eop_txd->dword[3] = cpu_to_le32(VMXNET3_TXD_CQ | VMXNET3_TXD_EOP);

	/* setup the SOP desc */
#ifdef __BIG_ENDIAN_BITFIELD
	gdesc = &tempTxDesc;
	gdesc->dword[2] = ctx.sop_txd->dword[2];
	gdesc->dword[3] = ctx.sop_txd->dword[3];
#else
	gdesc = ctx.sop_txd;
#endif
	tx_num_deferred = le32_to_cpu(tq->shared->txNumDeferred);
	if (ctx.mss) {
		gdesc->txd.hlen = ctx.eth_ip_hdr_size + ctx.l4_hdr_size;
		gdesc->txd.om = VMXNET3_OM_TSO;
		gdesc->txd.msscof = ctx.mss;
		num_pkts = (skb->len - gdesc->txd.hlen + ctx.mss - 1) / ctx.mss;
	} else {
		if (skb->ip_summed == CHECKSUM_PARTIAL) {
			gdesc->txd.hlen = ctx.eth_ip_hdr_size;
			gdesc->txd.om = VMXNET3_OM_CSUM;
			gdesc->txd.msscof = ctx.eth_ip_hdr_size +
					    skb->csum_offset;
		} else {
			gdesc->txd.om = 0;
			gdesc->txd.msscof = 0;
		}
		num_pkts = 1;
	}
	le32_add_cpu(&tq->shared->txNumDeferred, num_pkts);
	tx_num_deferred += num_pkts;

	if (skb_vlan_tag_present(skb)) {
		gdesc->txd.ti = 1;
		gdesc->txd.tci = skb_vlan_tag_get(skb);
	}

	/* Ensure that the write to (&gdesc->txd)->gen will be observed after
	 * all other writes to &gdesc->txd.
	 */
	dma_wmb();

	/* finally flips the GEN bit of the SOP desc. */
	gdesc->dword[2] = cpu_to_le32(le32_to_cpu(gdesc->dword[2]) ^
						  VMXNET3_TXD_GEN);
#ifdef __BIG_ENDIAN_BITFIELD
	/* Finished updating in bitfields of Tx Desc, so write them in original
	 * place.
	 */
	vmxnet3_TxDescToLe((struct Vmxnet3_TxDesc *)gdesc,
			   (struct Vmxnet3_TxDesc *)ctx.sop_txd);
	gdesc = ctx.sop_txd;
#endif
	netdev_dbg(adapter->netdev,
		"txd[%u]: SOP 0x%Lx 0x%x 0x%x\n",
		(u32)(ctx.sop_txd -
		tq->tx_ring.base), le64_to_cpu(gdesc->txd.addr),
		le32_to_cpu(gdesc->dword[2]), le32_to_cpu(gdesc->dword[3]));

	spin_unlock_irqrestore(&tq->tx_lock, flags);

	if (tx_num_deferred >= le32_to_cpu(tq->shared->txThreshold)) {
		tq->shared->txNumDeferred = 0;
		VMXNET3_WRITE_BAR0_REG(adapter,
				       VMXNET3_REG_TXPROD + tq->qid * 8,
				       tq->tx_ring.next2fill);
	}

	return NETDEV_TX_OK;

unlock_drop_pkt:
	spin_unlock_irqrestore(&tq->tx_lock, flags);
drop_pkt:
	tq->stats.drop_total++;
	dev_kfree_skb_any(skb);
	return NETDEV_TX_OK;
}


static netdev_tx_t
vmxnet3_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	BUG_ON(skb->queue_mapping > adapter->num_tx_queues);
	return vmxnet3_tq_xmit(skb,
			       &adapter->tx_queue[skb->queue_mapping],
			       adapter, netdev);
}


static void
vmxnet3_rx_csum(struct vmxnet3_adapter *adapter,
		struct sk_buff *skb,
		union Vmxnet3_GenericDesc *gdesc)
{
	if (!gdesc->rcd.cnc && adapter->netdev->features & NETIF_F_RXCSUM) {
		if (gdesc->rcd.v4 &&
		    (le32_to_cpu(gdesc->dword[3]) &
		     VMXNET3_RCD_CSUM_OK) == VMXNET3_RCD_CSUM_OK) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			BUG_ON(!(gdesc->rcd.tcp || gdesc->rcd.udp));
			BUG_ON(gdesc->rcd.frg);
		} else if (gdesc->rcd.v6 && (le32_to_cpu(gdesc->dword[3]) &
					     (1 << VMXNET3_RCD_TUC_SHIFT))) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			BUG_ON(!(gdesc->rcd.tcp || gdesc->rcd.udp));
			BUG_ON(gdesc->rcd.frg);
		} else {
			if (gdesc->rcd.csum) {
				skb->csum = htons(gdesc->rcd.csum);
				skb->ip_summed = CHECKSUM_PARTIAL;
			} else {
				skb_checksum_none_assert(skb);
			}
		}
	} else {
		skb_checksum_none_assert(skb);
	}
}


static void
vmxnet3_rx_error(struct vmxnet3_rx_queue *rq, struct Vmxnet3_RxCompDesc *rcd,
		 struct vmxnet3_rx_ctx *ctx,  struct vmxnet3_adapter *adapter)
{
	rq->stats.drop_err++;
	if (!rcd->fcs)
		rq->stats.drop_fcs++;

	rq->stats.drop_total++;

	/*
	 * We do not unmap and chain the rx buffer to the skb.
	 * We basically pretend this buffer is not used and will be recycled
	 * by vmxnet3_rq_alloc_rx_buf()
	 */

	/*
	 * ctx->skb may be NULL if this is the first and the only one
	 * desc for the pkt
	 */
	if (ctx->skb)
		dev_kfree_skb_irq(ctx->skb);

	ctx->skb = NULL;
}


static u32
vmxnet3_get_hdr_len(struct vmxnet3_adapter *adapter, struct sk_buff *skb,
		    union Vmxnet3_GenericDesc *gdesc)
{
	u32 hlen, maplen;
	union {
		void *ptr;
		struct ethhdr *eth;
		struct vlan_ethhdr *veth;
		struct iphdr *ipv4;
		struct ipv6hdr *ipv6;
		struct tcphdr *tcp;
	} hdr;
	BUG_ON(gdesc->rcd.tcp == 0);

	maplen = skb_headlen(skb);
	if (unlikely(sizeof(struct iphdr) + sizeof(struct tcphdr) > maplen))
		return 0;

	if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
	    skb->protocol == cpu_to_be16(ETH_P_8021AD))
		hlen = sizeof(struct vlan_ethhdr);
	else
		hlen = sizeof(struct ethhdr);

	hdr.eth = eth_hdr(skb);
	if (gdesc->rcd.v4) {
		BUG_ON(hdr.eth->h_proto != htons(ETH_P_IP) &&
		       hdr.veth->h_vlan_encapsulated_proto != htons(ETH_P_IP));
		hdr.ptr += hlen;
		BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP);
		hlen = hdr.ipv4->ihl << 2;
		hdr.ptr += hdr.ipv4->ihl << 2;
	} else if (gdesc->rcd.v6) {
		BUG_ON(hdr.eth->h_proto != htons(ETH_P_IPV6) &&
		       hdr.veth->h_vlan_encapsulated_proto != htons(ETH_P_IPV6));
		hdr.ptr += hlen;
		/* Use an estimated value, since we also need to handle
		 * TSO case.
		 */
		if (hdr.ipv6->nexthdr != IPPROTO_TCP)
			return sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
		hlen = sizeof(struct ipv6hdr);
		hdr.ptr += sizeof(struct ipv6hdr);
	} else {
		/* Non-IP pkt, dont estimate header length */
		return 0;
	}

	if (hlen + sizeof(struct tcphdr) > maplen)
		return 0;

	return (hlen + (hdr.tcp->doff << 2));
}

static int
vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
		       struct vmxnet3_adapter *adapter, int quota)
{
	static const u32 rxprod_reg[2] = {
		VMXNET3_REG_RXPROD, VMXNET3_REG_RXPROD2
	};
	u32 num_pkts = 0;
	bool skip_page_frags = false;
	struct Vmxnet3_RxCompDesc *rcd;
	struct vmxnet3_rx_ctx *ctx = &rq->rx_ctx;
	u16 segCnt = 0, mss = 0;
#ifdef __BIG_ENDIAN_BITFIELD
	struct Vmxnet3_RxDesc rxCmdDesc;
	struct Vmxnet3_RxCompDesc rxComp;
#endif
	vmxnet3_getRxComp(rcd, &rq->comp_ring.base[rq->comp_ring.next2proc].rcd,
			  &rxComp);
	while (rcd->gen == rq->comp_ring.gen) {
		struct vmxnet3_rx_buf_info *rbi;
		struct sk_buff *skb, *new_skb = NULL;
		struct page *new_page = NULL;
		dma_addr_t new_dma_addr;
		int num_to_alloc;
		struct Vmxnet3_RxDesc *rxd;
		u32 idx, ring_idx;
		struct vmxnet3_cmd_ring	*ring = NULL;
		if (num_pkts >= quota) {
			/* we may stop even before we see the EOP desc of
			 * the current pkt
			 */
			break;
		}

		/* Prevent any rcd field from being (speculatively) read before
		 * rcd->gen is read.
		 */
		dma_rmb();

		BUG_ON(rcd->rqID != rq->qid && rcd->rqID != rq->qid2 &&
		       rcd->rqID != rq->dataRingQid);
		idx = rcd->rxdIdx;
		ring_idx = VMXNET3_GET_RING_IDX(adapter, rcd->rqID);
		ring = rq->rx_ring + ring_idx;
		vmxnet3_getRxDesc(rxd, &rq->rx_ring[ring_idx].base[idx].rxd,
				  &rxCmdDesc);
		rbi = rq->buf_info[ring_idx] + idx;

		BUG_ON(rxd->addr != rbi->dma_addr ||
		       rxd->len != rbi->len);

		if (unlikely(rcd->eop && rcd->err)) {
			vmxnet3_rx_error(rq, rcd, ctx, adapter);
			goto rcd_done;
		}

		if (rcd->sop) { /* first buf of the pkt */
			bool rxDataRingUsed;
			u16 len;

			BUG_ON(rxd->btype != VMXNET3_RXD_BTYPE_HEAD ||
			       (rcd->rqID != rq->qid &&
				rcd->rqID != rq->dataRingQid));

			BUG_ON(rbi->buf_type != VMXNET3_RX_BUF_SKB);
			BUG_ON(ctx->skb != NULL || rbi->skb == NULL);

			if (unlikely(rcd->len == 0)) {
				/* Pretend the rx buffer is skipped. */
				BUG_ON(!(rcd->sop && rcd->eop));
				netdev_dbg(adapter->netdev,
					"rxRing[%u][%u] 0 length\n",
					ring_idx, idx);
				goto rcd_done;
			}

			skip_page_frags = false;
			ctx->skb = rbi->skb;

			rxDataRingUsed =
				VMXNET3_RX_DATA_RING(adapter, rcd->rqID);
			len = rxDataRingUsed ? rcd->len : rbi->len;
			new_skb = netdev_alloc_skb_ip_align(adapter->netdev,
							    len);
			if (new_skb == NULL) {
				/* Skb allocation failed, do not handover this
				 * skb to stack. Reuse it. Drop the existing pkt
				 */
				rq->stats.rx_buf_alloc_failure++;
				ctx->skb = NULL;
				rq->stats.drop_total++;
				skip_page_frags = true;
				goto rcd_done;
			}

			if (rxDataRingUsed) {
				size_t sz;

				BUG_ON(rcd->len > rq->data_ring.desc_size);

				ctx->skb = new_skb;
				sz = rcd->rxdIdx * rq->data_ring.desc_size;
				memcpy(new_skb->data,
				       &rq->data_ring.base[sz], rcd->len);
			} else {
				ctx->skb = rbi->skb;

				new_dma_addr =
					dma_map_single(&adapter->pdev->dev,
						       new_skb->data, rbi->len,
						       PCI_DMA_FROMDEVICE);
				if (dma_mapping_error(&adapter->pdev->dev,
						      new_dma_addr)) {
					dev_kfree_skb(new_skb);
					/* Skb allocation failed, do not
					 * handover this skb to stack. Reuse
					 * it. Drop the existing pkt.
					 */
					rq->stats.rx_buf_alloc_failure++;
					ctx->skb = NULL;
					rq->stats.drop_total++;
					skip_page_frags = true;
					goto rcd_done;
				}

				dma_unmap_single(&adapter->pdev->dev,
						 rbi->dma_addr,
						 rbi->len,
						 PCI_DMA_FROMDEVICE);

				/* Immediate refill */
				rbi->skb = new_skb;
				rbi->dma_addr = new_dma_addr;
				rxd->addr = cpu_to_le64(rbi->dma_addr);
				rxd->len = rbi->len;
			}

#ifdef VMXNET3_RSS
			if (rcd->rssType != VMXNET3_RCD_RSS_TYPE_NONE &&
			    (adapter->netdev->features & NETIF_F_RXHASH))
				skb_set_hash(ctx->skb,
					     le32_to_cpu(rcd->rssHash),
					     PKT_HASH_TYPE_L3);
#endif
			skb_put(ctx->skb, rcd->len);

			if (VMXNET3_VERSION_GE_2(adapter) &&
			    rcd->type == VMXNET3_CDTYPE_RXCOMP_LRO) {
				struct Vmxnet3_RxCompDescExt *rcdlro;
				rcdlro = (struct Vmxnet3_RxCompDescExt *)rcd;

				segCnt = rcdlro->segCnt;
				WARN_ON_ONCE(segCnt == 0);
				mss = rcdlro->mss;
				if (unlikely(segCnt <= 1))
					segCnt = 0;
			} else {
				segCnt = 0;
			}
		} else {
			BUG_ON(ctx->skb == NULL && !skip_page_frags);

			/* non SOP buffer must be type 1 in most cases */
			BUG_ON(rbi->buf_type != VMXNET3_RX_BUF_PAGE);
			BUG_ON(rxd->btype != VMXNET3_RXD_BTYPE_BODY);

			/* If an sop buffer was dropped, skip all
			 * following non-sop fragments. They will be reused.
			 */
			if (skip_page_frags)
				goto rcd_done;

			if (rcd->len) {
				new_page = alloc_page(GFP_ATOMIC);
				/* Replacement page frag could not be allocated.
				 * Reuse this page. Drop the pkt and free the
				 * skb which contained this page as a frag. Skip
				 * processing all the following non-sop frags.
				 */
				if (unlikely(!new_page)) {
					rq->stats.rx_buf_alloc_failure++;
					dev_kfree_skb(ctx->skb);
					ctx->skb = NULL;
					skip_page_frags = true;
					goto rcd_done;
				}
				new_dma_addr = dma_map_page(&adapter->pdev->dev,
							    new_page,
							    0, PAGE_SIZE,
							    PCI_DMA_FROMDEVICE);
				if (dma_mapping_error(&adapter->pdev->dev,
						      new_dma_addr)) {
					put_page(new_page);
					rq->stats.rx_buf_alloc_failure++;
					dev_kfree_skb(ctx->skb);
					ctx->skb = NULL;
					skip_page_frags = true;
					goto rcd_done;
				}

				dma_unmap_page(&adapter->pdev->dev,
					       rbi->dma_addr, rbi->len,
					       PCI_DMA_FROMDEVICE);

				vmxnet3_append_frag(ctx->skb, rcd, rbi);

				/* Immediate refill */
				rbi->page = new_page;
				rbi->dma_addr = new_dma_addr;
				rxd->addr = cpu_to_le64(rbi->dma_addr);
				rxd->len = rbi->len;
			}
		}


		skb = ctx->skb;
		if (rcd->eop) {
			u32 mtu = adapter->netdev->mtu;
			skb->len += skb->data_len;

			vmxnet3_rx_csum(adapter, skb,
					(union Vmxnet3_GenericDesc *)rcd);
			skb->protocol = eth_type_trans(skb, adapter->netdev);
			if (!rcd->tcp ||
			    !(adapter->netdev->features & NETIF_F_LRO))
				goto not_lro;

			if (segCnt != 0 && mss != 0) {
				skb_shinfo(skb)->gso_type = rcd->v4 ?
					SKB_GSO_TCPV4 : SKB_GSO_TCPV6;
				skb_shinfo(skb)->gso_size = mss;
				skb_shinfo(skb)->gso_segs = segCnt;
			} else if (segCnt != 0 || skb->len > mtu) {
				u32 hlen;

				hlen = vmxnet3_get_hdr_len(adapter, skb,
					(union Vmxnet3_GenericDesc *)rcd);
				if (hlen == 0)
					goto not_lro;

				skb_shinfo(skb)->gso_type =
					rcd->v4 ? SKB_GSO_TCPV4 : SKB_GSO_TCPV6;
				if (segCnt != 0) {
					skb_shinfo(skb)->gso_segs = segCnt;
					skb_shinfo(skb)->gso_size =
						DIV_ROUND_UP(skb->len -
							hlen, segCnt);
				} else {
					skb_shinfo(skb)->gso_size = mtu - hlen;
				}
			}
not_lro:
			if (unlikely(rcd->ts))
				__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), rcd->tci);

			if (adapter->netdev->features & NETIF_F_LRO)
				netif_receive_skb(skb);
			else
				napi_gro_receive(&rq->napi, skb);

			ctx->skb = NULL;
			num_pkts++;
		}

rcd_done:
		/* device may have skipped some rx descs */
		ring->next2comp = idx;
		num_to_alloc = vmxnet3_cmd_ring_desc_avail(ring);
		ring = rq->rx_ring + ring_idx;

		/* Ensure that the writes to rxd->gen bits will be observed
		 * after all other writes to rxd objects.
		 */
		dma_wmb();

		while (num_to_alloc) {
			vmxnet3_getRxDesc(rxd, &ring->base[ring->next2fill].rxd,
					  &rxCmdDesc);
			BUG_ON(!rxd->addr);

			/* Recv desc is ready to be used by the device */
			rxd->gen = ring->gen;
			vmxnet3_cmd_ring_adv_next2fill(ring);
			num_to_alloc--;
		}

		/* if needed, update the register */
		if (unlikely(rq->shared->updateRxProd)) {
			VMXNET3_WRITE_BAR0_REG(adapter,
					       rxprod_reg[ring_idx] + rq->qid * 8,
					       ring->next2fill);
		}

		vmxnet3_comp_ring_adv_next2proc(&rq->comp_ring);
		vmxnet3_getRxComp(rcd,
				  &rq->comp_ring.base[rq->comp_ring.next2proc].rcd, &rxComp);
	}

	return num_pkts;
}


static void
vmxnet3_rq_cleanup(struct vmxnet3_rx_queue *rq,
		   struct vmxnet3_adapter *adapter)
{
	u32 i, ring_idx;
	struct Vmxnet3_RxDesc *rxd;

	/* ring has already been cleaned up */
	if (!rq->rx_ring[0].base)
		return;

	for (ring_idx = 0; ring_idx < 2; ring_idx++) {
		for (i = 0; i < rq->rx_ring[ring_idx].size; i++) {
#ifdef __BIG_ENDIAN_BITFIELD
			struct Vmxnet3_RxDesc rxDesc;
#endif
			vmxnet3_getRxDesc(rxd,
				&rq->rx_ring[ring_idx].base[i].rxd, &rxDesc);

			if (rxd->btype == VMXNET3_RXD_BTYPE_HEAD &&
					rq->buf_info[ring_idx][i].skb) {
				dma_unmap_single(&adapter->pdev->dev, rxd->addr,
						 rxd->len, PCI_DMA_FROMDEVICE);
				dev_kfree_skb(rq->buf_info[ring_idx][i].skb);
				rq->buf_info[ring_idx][i].skb = NULL;
			} else if (rxd->btype == VMXNET3_RXD_BTYPE_BODY &&
					rq->buf_info[ring_idx][i].page) {
				dma_unmap_page(&adapter->pdev->dev, rxd->addr,
					       rxd->len, PCI_DMA_FROMDEVICE);
				put_page(rq->buf_info[ring_idx][i].page);
				rq->buf_info[ring_idx][i].page = NULL;
			}
		}

		rq->rx_ring[ring_idx].gen = VMXNET3_INIT_GEN;
		rq->rx_ring[ring_idx].next2fill =
					rq->rx_ring[ring_idx].next2comp = 0;
	}

	rq->comp_ring.gen = VMXNET3_INIT_GEN;
	rq->comp_ring.next2proc = 0;
}


static void
vmxnet3_rq_cleanup_all(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_rx_queues; i++)
		vmxnet3_rq_cleanup(&adapter->rx_queue[i], adapter);
}


static void vmxnet3_rq_destroy(struct vmxnet3_rx_queue *rq,
			       struct vmxnet3_adapter *adapter)
{
	int i;
	int j;

	/* all rx buffers must have already been freed */
	for (i = 0; i < 2; i++) {
		if (rq->buf_info[i]) {
			for (j = 0; j < rq->rx_ring[i].size; j++)
				BUG_ON(rq->buf_info[i][j].page != NULL);
		}
	}


	for (i = 0; i < 2; i++) {
		if (rq->rx_ring[i].base) {
			dma_free_coherent(&adapter->pdev->dev,
					  rq->rx_ring[i].size
					  * sizeof(struct Vmxnet3_RxDesc),
					  rq->rx_ring[i].base,
					  rq->rx_ring[i].basePA);
			rq->rx_ring[i].base = NULL;
		}
	}

	if (rq->data_ring.base) {
		dma_free_coherent(&adapter->pdev->dev,
				  rq->rx_ring[0].size * rq->data_ring.desc_size,
				  rq->data_ring.base, rq->data_ring.basePA);
		rq->data_ring.base = NULL;
	}

	if (rq->comp_ring.base) {
		dma_free_coherent(&adapter->pdev->dev, rq->comp_ring.size
				  * sizeof(struct Vmxnet3_RxCompDesc),
				  rq->comp_ring.base, rq->comp_ring.basePA);
		rq->comp_ring.base = NULL;
	}

	if (rq->buf_info[0]) {
		size_t sz = sizeof(struct vmxnet3_rx_buf_info) *
			(rq->rx_ring[0].size + rq->rx_ring[1].size);
		dma_free_coherent(&adapter->pdev->dev, sz, rq->buf_info[0],
				  rq->buf_info_pa);
		rq->buf_info[0] = rq->buf_info[1] = NULL;
	}
}

static void
vmxnet3_rq_destroy_all_rxdataring(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_rx_queues; i++) {
		struct vmxnet3_rx_queue *rq = &adapter->rx_queue[i];

		if (rq->data_ring.base) {
			dma_free_coherent(&adapter->pdev->dev,
					  (rq->rx_ring[0].size *
					  rq->data_ring.desc_size),
					  rq->data_ring.base,
					  rq->data_ring.basePA);
			rq->data_ring.base = NULL;
			rq->data_ring.desc_size = 0;
		}
	}
}

static int
vmxnet3_rq_init(struct vmxnet3_rx_queue *rq,
		struct vmxnet3_adapter  *adapter)
{
	int i;

	/* initialize buf_info */
	for (i = 0; i < rq->rx_ring[0].size; i++) {

		/* 1st buf for a pkt is skbuff */
		if (i % adapter->rx_buf_per_pkt == 0) {
			rq->buf_info[0][i].buf_type = VMXNET3_RX_BUF_SKB;
			rq->buf_info[0][i].len = adapter->skb_buf_size;
		} else { /* subsequent bufs for a pkt is frag */
			rq->buf_info[0][i].buf_type = VMXNET3_RX_BUF_PAGE;
			rq->buf_info[0][i].len = PAGE_SIZE;
		}
	}
	for (i = 0; i < rq->rx_ring[1].size; i++) {
		rq->buf_info[1][i].buf_type = VMXNET3_RX_BUF_PAGE;
		rq->buf_info[1][i].len = PAGE_SIZE;
	}

	/* reset internal state and allocate buffers for both rings */
	for (i = 0; i < 2; i++) {
		rq->rx_ring[i].next2fill = rq->rx_ring[i].next2comp = 0;

		memset(rq->rx_ring[i].base, 0, rq->rx_ring[i].size *
		       sizeof(struct Vmxnet3_RxDesc));
		rq->rx_ring[i].gen = VMXNET3_INIT_GEN;
	}
	if (vmxnet3_rq_alloc_rx_buf(rq, 0, rq->rx_ring[0].size - 1,
				    adapter) == 0) {
		/* at least has 1 rx buffer for the 1st ring */
		return -ENOMEM;
	}
	vmxnet3_rq_alloc_rx_buf(rq, 1, rq->rx_ring[1].size - 1, adapter);

	/* reset the comp ring */
	rq->comp_ring.next2proc = 0;
	memset(rq->comp_ring.base, 0, rq->comp_ring.size *
	       sizeof(struct Vmxnet3_RxCompDesc));
	rq->comp_ring.gen = VMXNET3_INIT_GEN;

	/* reset rxctx */
	rq->rx_ctx.skb = NULL;

	/* stats are not reset */
	return 0;
}


static int
vmxnet3_rq_init_all(struct vmxnet3_adapter *adapter)
{
	int i, err = 0;

	for (i = 0; i < adapter->num_rx_queues; i++) {
		err = vmxnet3_rq_init(&adapter->rx_queue[i], adapter);
		if (unlikely(err)) {
			dev_err(&adapter->netdev->dev, "%s: failed to "
				"initialize rx queue%i\n",
				adapter->netdev->name, i);
			break;
		}
	}
	return err;

}


static int
vmxnet3_rq_create(struct vmxnet3_rx_queue *rq, struct vmxnet3_adapter *adapter)
{
	int i;
	size_t sz;
	struct vmxnet3_rx_buf_info *bi;

	for (i = 0; i < 2; i++) {

		sz = rq->rx_ring[i].size * sizeof(struct Vmxnet3_RxDesc);
		rq->rx_ring[i].base = dma_alloc_coherent(
						&adapter->pdev->dev, sz,
						&rq->rx_ring[i].basePA,
						GFP_KERNEL);
		if (!rq->rx_ring[i].base) {
			netdev_err(adapter->netdev,
				   "failed to allocate rx ring %d\n", i);
			goto err;
		}
	}

	if ((adapter->rxdataring_enabled) && (rq->data_ring.desc_size != 0)) {
		sz = rq->rx_ring[0].size * rq->data_ring.desc_size;
		rq->data_ring.base =
			dma_alloc_coherent(&adapter->pdev->dev, sz,
					   &rq->data_ring.basePA,
					   GFP_KERNEL);
		if (!rq->data_ring.base) {
			netdev_err(adapter->netdev,
				   "rx data ring will be disabled\n");
			adapter->rxdataring_enabled = false;
		}
	} else {
		rq->data_ring.base = NULL;
		rq->data_ring.desc_size = 0;
	}

	sz = rq->comp_ring.size * sizeof(struct Vmxnet3_RxCompDesc);
	rq->comp_ring.base = dma_alloc_coherent(&adapter->pdev->dev, sz,
						&rq->comp_ring.basePA,
						GFP_KERNEL);
	if (!rq->comp_ring.base) {
		netdev_err(adapter->netdev, "failed to allocate rx comp ring\n");
		goto err;
	}

	sz = sizeof(struct vmxnet3_rx_buf_info) * (rq->rx_ring[0].size +
						   rq->rx_ring[1].size);
	bi = dma_alloc_coherent(&adapter->pdev->dev, sz, &rq->buf_info_pa,
				GFP_KERNEL);
	if (!bi)
		goto err;

	rq->buf_info[0] = bi;
	rq->buf_info[1] = bi + rq->rx_ring[0].size;

	return 0;

err:
	vmxnet3_rq_destroy(rq, adapter);
	return -ENOMEM;
}


static int
vmxnet3_rq_create_all(struct vmxnet3_adapter *adapter)
{
	int i, err = 0;

	adapter->rxdataring_enabled = VMXNET3_VERSION_GE_3(adapter);

	for (i = 0; i < adapter->num_rx_queues; i++) {
		err = vmxnet3_rq_create(&adapter->rx_queue[i], adapter);
		if (unlikely(err)) {
			dev_err(&adapter->netdev->dev,
				"%s: failed to create rx queue%i\n",
				adapter->netdev->name, i);
			goto err_out;
		}
	}

	if (!adapter->rxdataring_enabled)
		vmxnet3_rq_destroy_all_rxdataring(adapter);

	return err;
err_out:
	vmxnet3_rq_destroy_all(adapter);
	return err;

}

/* Multiple queue aware polling function for tx and rx */

static int
vmxnet3_do_poll(struct vmxnet3_adapter *adapter, int budget)
{
	int rcd_done = 0, i;
	if (unlikely(adapter->shared->ecr))
		vmxnet3_process_events(adapter);
	for (i = 0; i < adapter->num_tx_queues; i++)
		vmxnet3_tq_tx_complete(&adapter->tx_queue[i], adapter);

	for (i = 0; i < adapter->num_rx_queues; i++)
		rcd_done += vmxnet3_rq_rx_complete(&adapter->rx_queue[i],
						   adapter, budget);
	return rcd_done;
}


static int
vmxnet3_poll(struct napi_struct *napi, int budget)
{
	struct vmxnet3_rx_queue *rx_queue = container_of(napi,
					  struct vmxnet3_rx_queue, napi);
	int rxd_done;

	rxd_done = vmxnet3_do_poll(rx_queue->adapter, budget);

	if (rxd_done < budget) {
		napi_complete_done(napi, rxd_done);
		vmxnet3_enable_all_intrs(rx_queue->adapter);
	}
	return rxd_done;
}

/*
 * NAPI polling function for MSI-X mode with multiple Rx queues
 * Returns the # of the NAPI credit consumed (# of rx descriptors processed)
 */

static int
vmxnet3_poll_rx_only(struct napi_struct *napi, int budget)
{
	struct vmxnet3_rx_queue *rq = container_of(napi,
						struct vmxnet3_rx_queue, napi);
	struct vmxnet3_adapter *adapter = rq->adapter;
	int rxd_done;

	/* When sharing interrupt with corresponding tx queue, process
	 * tx completions in that queue as well
	 */
	if (adapter->share_intr == VMXNET3_INTR_BUDDYSHARE) {
		struct vmxnet3_tx_queue *tq =
				&adapter->tx_queue[rq - adapter->rx_queue];
		vmxnet3_tq_tx_complete(tq, adapter);
	}

	rxd_done = vmxnet3_rq_rx_complete(rq, adapter, budget);

	if (rxd_done < budget) {
		napi_complete_done(napi, rxd_done);
		vmxnet3_enable_intr(adapter, rq->comp_ring.intr_idx);
	}
	return rxd_done;
}


#ifdef CONFIG_PCI_MSI

/*
 * Handle completion interrupts on tx queues
 * Returns whether or not the intr is handled
 */

static irqreturn_t
vmxnet3_msix_tx(int irq, void *data)
{
	struct vmxnet3_tx_queue *tq = data;
	struct vmxnet3_adapter *adapter = tq->adapter;

	if (adapter->intr.mask_mode == VMXNET3_IMM_ACTIVE)
		vmxnet3_disable_intr(adapter, tq->comp_ring.intr_idx);

	/* Handle the case where only one irq is allocate for all tx queues */
	if (adapter->share_intr == VMXNET3_INTR_TXSHARE) {
		int i;
		for (i = 0; i < adapter->num_tx_queues; i++) {
			struct vmxnet3_tx_queue *txq = &adapter->tx_queue[i];
			vmxnet3_tq_tx_complete(txq, adapter);
		}
	} else {
		vmxnet3_tq_tx_complete(tq, adapter);
	}
	vmxnet3_enable_intr(adapter, tq->comp_ring.intr_idx);

	return IRQ_HANDLED;
}


/*
 * Handle completion interrupts on rx queues. Returns whether or not the
 * intr is handled
 */

static irqreturn_t
vmxnet3_msix_rx(int irq, void *data)
{
	struct vmxnet3_rx_queue *rq = data;
	struct vmxnet3_adapter *adapter = rq->adapter;

	/* disable intr if needed */
	if (adapter->intr.mask_mode == VMXNET3_IMM_ACTIVE)
		vmxnet3_disable_intr(adapter, rq->comp_ring.intr_idx);
	napi_schedule(&rq->napi);

	return IRQ_HANDLED;
}

/*
 *----------------------------------------------------------------------------
 *
 * vmxnet3_msix_event --
 *
 *    vmxnet3 msix event intr handler
 *
 * Result:
 *    whether or not the intr is handled
 *
 *----------------------------------------------------------------------------
 */

static irqreturn_t
vmxnet3_msix_event(int irq, void *data)
{
	struct net_device *dev = data;
	struct vmxnet3_adapter *adapter = netdev_priv(dev);

	/* disable intr if needed */
	if (adapter->intr.mask_mode == VMXNET3_IMM_ACTIVE)
		vmxnet3_disable_intr(adapter, adapter->intr.event_intr_idx);

	if (adapter->shared->ecr)
		vmxnet3_process_events(adapter);

	vmxnet3_enable_intr(adapter, adapter->intr.event_intr_idx);

	return IRQ_HANDLED;
}

#endif /* CONFIG_PCI_MSI  */


/* Interrupt handler for vmxnet3  */
static irqreturn_t
vmxnet3_intr(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct vmxnet3_adapter *adapter = netdev_priv(dev);

	if (adapter->intr.type == VMXNET3_IT_INTX) {
		u32 icr = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_ICR);
		if (unlikely(icr == 0))
			/* not ours */
			return IRQ_NONE;
	}


	/* disable intr if needed */
	if (adapter->intr.mask_mode == VMXNET3_IMM_ACTIVE)
		vmxnet3_disable_all_intrs(adapter);

	napi_schedule(&adapter->rx_queue[0].napi);

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER

/* netpoll callback. */
static void
vmxnet3_netpoll(struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	switch (adapter->intr.type) {
#ifdef CONFIG_PCI_MSI
	case VMXNET3_IT_MSIX: {
		int i;
		for (i = 0; i < adapter->num_rx_queues; i++)
			vmxnet3_msix_rx(0, &adapter->rx_queue[i]);
		break;
	}
#endif
	case VMXNET3_IT_MSI:
	default:
		vmxnet3_intr(0, adapter->netdev);
		break;
	}

}
#endif	/* CONFIG_NET_POLL_CONTROLLER */

static int
vmxnet3_request_irqs(struct vmxnet3_adapter *adapter)
{
	struct vmxnet3_intr *intr = &adapter->intr;
	int err = 0, i;
	int vector = 0;

#ifdef CONFIG_PCI_MSI
	if (adapter->intr.type == VMXNET3_IT_MSIX) {
		for (i = 0; i < adapter->num_tx_queues; i++) {
			if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE) {
				sprintf(adapter->tx_queue[i].name, "%s-tx-%d",
					adapter->netdev->name, vector);
				err = request_irq(
					      intr->msix_entries[vector].vector,
					      vmxnet3_msix_tx, 0,
					      adapter->tx_queue[i].name,
					      &adapter->tx_queue[i]);
			} else {
				sprintf(adapter->tx_queue[i].name, "%s-rxtx-%d",
					adapter->netdev->name, vector);
			}
			if (err) {
				dev_err(&adapter->netdev->dev,
					"Failed to request irq for MSIX, %s, "
					"error %d\n",
					adapter->tx_queue[i].name, err);
				return err;
			}

			/* Handle the case where only 1 MSIx was allocated for
			 * all tx queues */
			if (adapter->share_intr == VMXNET3_INTR_TXSHARE) {
				for (; i < adapter->num_tx_queues; i++)
					adapter->tx_queue[i].comp_ring.intr_idx
								= vector;
				vector++;
				break;
			} else {
				adapter->tx_queue[i].comp_ring.intr_idx
								= vector++;
			}
		}
		if (adapter->share_intr == VMXNET3_INTR_BUDDYSHARE)
			vector = 0;

		for (i = 0; i < adapter->num_rx_queues; i++) {
			if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE)
				sprintf(adapter->rx_queue[i].name, "%s-rx-%d",
					adapter->netdev->name, vector);
			else
				sprintf(adapter->rx_queue[i].name, "%s-rxtx-%d",
					adapter->netdev->name, vector);
			err = request_irq(intr->msix_entries[vector].vector,
					  vmxnet3_msix_rx, 0,
					  adapter->rx_queue[i].name,
					  &(adapter->rx_queue[i]));
			if (err) {
				netdev_err(adapter->netdev,
					   "Failed to request irq for MSIX, "
					   "%s, error %d\n",
					   adapter->rx_queue[i].name, err);
				return err;
			}

			adapter->rx_queue[i].comp_ring.intr_idx = vector++;
		}

		sprintf(intr->event_msi_vector_name, "%s-event-%d",
			adapter->netdev->name, vector);
		err = request_irq(intr->msix_entries[vector].vector,
				  vmxnet3_msix_event, 0,
				  intr->event_msi_vector_name, adapter->netdev);
		intr->event_intr_idx = vector;

	} else if (intr->type == VMXNET3_IT_MSI) {
		adapter->num_rx_queues = 1;
		err = request_irq(adapter->pdev->irq, vmxnet3_intr, 0,
				  adapter->netdev->name, adapter->netdev);
	} else {
#endif
		adapter->num_rx_queues = 1;
		err = request_irq(adapter->pdev->irq, vmxnet3_intr,
				  IRQF_SHARED, adapter->netdev->name,
				  adapter->netdev);
#ifdef CONFIG_PCI_MSI
	}
#endif
	intr->num_intrs = vector + 1;
	if (err) {
		netdev_err(adapter->netdev,
			   "Failed to request irq (intr type:%d), error %d\n",
			   intr->type, err);
	} else {
		/* Number of rx queues will not change after this */
		for (i = 0; i < adapter->num_rx_queues; i++) {
			struct vmxnet3_rx_queue *rq = &adapter->rx_queue[i];
			rq->qid = i;
			rq->qid2 = i + adapter->num_rx_queues;
			rq->dataRingQid = i + 2 * adapter->num_rx_queues;
		}

		/* init our intr settings */
		for (i = 0; i < intr->num_intrs; i++)
			intr->mod_levels[i] = UPT1_IML_ADAPTIVE;
		if (adapter->intr.type != VMXNET3_IT_MSIX) {
			adapter->intr.event_intr_idx = 0;
			for (i = 0; i < adapter->num_tx_queues; i++)
				adapter->tx_queue[i].comp_ring.intr_idx = 0;
			adapter->rx_queue[0].comp_ring.intr_idx = 0;
		}

		netdev_info(adapter->netdev,
			    "intr type %u, mode %u, %u vectors allocated\n",
			    intr->type, intr->mask_mode, intr->num_intrs);
	}

	return err;
}


static void
vmxnet3_free_irqs(struct vmxnet3_adapter *adapter)
{
	struct vmxnet3_intr *intr = &adapter->intr;
	BUG_ON(intr->type == VMXNET3_IT_AUTO || intr->num_intrs <= 0);

	switch (intr->type) {
#ifdef CONFIG_PCI_MSI
	case VMXNET3_IT_MSIX:
	{
		int i, vector = 0;

		if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE) {
			for (i = 0; i < adapter->num_tx_queues; i++) {
				free_irq(intr->msix_entries[vector++].vector,
					 &(adapter->tx_queue[i]));
				if (adapter->share_intr == VMXNET3_INTR_TXSHARE)
					break;
			}
		}

		for (i = 0; i < adapter->num_rx_queues; i++) {
			free_irq(intr->msix_entries[vector++].vector,
				 &(adapter->rx_queue[i]));
		}

		free_irq(intr->msix_entries[vector].vector,
			 adapter->netdev);
		BUG_ON(vector >= intr->num_intrs);
		break;
	}
#endif
	case VMXNET3_IT_MSI:
		free_irq(adapter->pdev->irq, adapter->netdev);
		break;
	case VMXNET3_IT_INTX:
		free_irq(adapter->pdev->irq, adapter->netdev);
		break;
	default:
		BUG();
	}
}


static void
vmxnet3_restore_vlan(struct vmxnet3_adapter *adapter)
{
	u32 *vfTable = adapter->shared->devRead.rxFilterConf.vfTable;
	u16 vid;

	/* allow untagged pkts */
	VMXNET3_SET_VFTABLE_ENTRY(vfTable, 0);

	for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
		VMXNET3_SET_VFTABLE_ENTRY(vfTable, vid);
}


static int
vmxnet3_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	if (!(netdev->flags & IFF_PROMISC)) {
		u32 *vfTable = adapter->shared->devRead.rxFilterConf.vfTable;
		unsigned long flags;

		VMXNET3_SET_VFTABLE_ENTRY(vfTable, vid);
		spin_lock_irqsave(&adapter->cmd_lock, flags);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_UPDATE_VLAN_FILTERS);
		spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	}

	set_bit(vid, adapter->active_vlans);

	return 0;
}


static int
vmxnet3_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	if (!(netdev->flags & IFF_PROMISC)) {
		u32 *vfTable = adapter->shared->devRead.rxFilterConf.vfTable;
		unsigned long flags;

		VMXNET3_CLEAR_VFTABLE_ENTRY(vfTable, vid);
		spin_lock_irqsave(&adapter->cmd_lock, flags);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_UPDATE_VLAN_FILTERS);
		spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	}

	clear_bit(vid, adapter->active_vlans);

	return 0;
}


static u8 *
vmxnet3_copy_mc(struct net_device *netdev)
{
	u8 *buf = NULL;
	u32 sz = netdev_mc_count(netdev) * ETH_ALEN;

	/* struct Vmxnet3_RxFilterConf.mfTableLen is u16. */
	if (sz <= 0xffff) {
		/* We may be called with BH disabled */
		buf = kmalloc(sz, GFP_ATOMIC);
		if (buf) {
			struct netdev_hw_addr *ha;
			int i = 0;

			netdev_for_each_mc_addr(ha, netdev)
				memcpy(buf + i++ * ETH_ALEN, ha->addr,
				       ETH_ALEN);
		}
	}
	return buf;
}


static void
vmxnet3_set_mc(struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;
	struct Vmxnet3_RxFilterConf *rxConf =
					&adapter->shared->devRead.rxFilterConf;
	u8 *new_table = NULL;
	dma_addr_t new_table_pa = 0;
	bool new_table_pa_valid = false;
	u32 new_mode = VMXNET3_RXM_UCAST;

	if (netdev->flags & IFF_PROMISC) {
		u32 *vfTable = adapter->shared->devRead.rxFilterConf.vfTable;
		memset(vfTable, 0, VMXNET3_VFT_SIZE * sizeof(*vfTable));

		new_mode |= VMXNET3_RXM_PROMISC;
	} else {
		vmxnet3_restore_vlan(adapter);
	}

	if (netdev->flags & IFF_BROADCAST)
		new_mode |= VMXNET3_RXM_BCAST;

	if (netdev->flags & IFF_ALLMULTI)
		new_mode |= VMXNET3_RXM_ALL_MULTI;
	else
		if (!netdev_mc_empty(netdev)) {
			new_table = vmxnet3_copy_mc(netdev);
			if (new_table) {
				size_t sz = netdev_mc_count(netdev) * ETH_ALEN;

				rxConf->mfTableLen = cpu_to_le16(sz);
				new_table_pa = dma_map_single(
							&adapter->pdev->dev,
							new_table,
							sz,
							PCI_DMA_TODEVICE);
				if (!dma_mapping_error(&adapter->pdev->dev,
						       new_table_pa)) {
					new_mode |= VMXNET3_RXM_MCAST;
					new_table_pa_valid = true;
					rxConf->mfTablePA = cpu_to_le64(
								new_table_pa);
				}
			}
			if (!new_table_pa_valid) {
				netdev_info(netdev,
					    "failed to copy mcast list, setting ALL_MULTI\n");
				new_mode |= VMXNET3_RXM_ALL_MULTI;
			}
		}

	if (!(new_mode & VMXNET3_RXM_MCAST)) {
		rxConf->mfTableLen = 0;
		rxConf->mfTablePA = 0;
	}

	spin_lock_irqsave(&adapter->cmd_lock, flags);
	if (new_mode != rxConf->rxMode) {
		rxConf->rxMode = cpu_to_le32(new_mode);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_UPDATE_RX_MODE);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_UPDATE_VLAN_FILTERS);
	}

	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_UPDATE_MAC_FILTERS);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);

	if (new_table_pa_valid)
		dma_unmap_single(&adapter->pdev->dev, new_table_pa,
				 rxConf->mfTableLen, PCI_DMA_TODEVICE);
	kfree(new_table);
}

void
vmxnet3_rq_destroy_all(struct vmxnet3_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_rx_queues; i++)
		vmxnet3_rq_destroy(&adapter->rx_queue[i], adapter);
}


/*
 *   Set up driver_shared based on settings in adapter.
 */

static void
vmxnet3_setup_driver_shared(struct vmxnet3_adapter *adapter)
{
	struct Vmxnet3_DriverShared *shared = adapter->shared;
	struct Vmxnet3_DSDevRead *devRead = &shared->devRead;
	struct Vmxnet3_TxQueueConf *tqc;
	struct Vmxnet3_RxQueueConf *rqc;
	int i;

	memset(shared, 0, sizeof(*shared));

	/* driver settings */
	shared->magic = cpu_to_le32(VMXNET3_REV1_MAGIC);
	devRead->misc.driverInfo.version = cpu_to_le32(
						VMXNET3_DRIVER_VERSION_NUM);
	devRead->misc.driverInfo.gos.gosBits = (sizeof(void *) == 4 ?
				VMXNET3_GOS_BITS_32 : VMXNET3_GOS_BITS_64);
	devRead->misc.driverInfo.gos.gosType = VMXNET3_GOS_TYPE_LINUX;
	*((u32 *)&devRead->misc.driverInfo.gos) = cpu_to_le32(
				*((u32 *)&devRead->misc.driverInfo.gos));
	devRead->misc.driverInfo.vmxnet3RevSpt = cpu_to_le32(1);
	devRead->misc.driverInfo.uptVerSpt = cpu_to_le32(1);

	devRead->misc.ddPA = cpu_to_le64(adapter->adapter_pa);
	devRead->misc.ddLen = cpu_to_le32(sizeof(struct vmxnet3_adapter));

	/* set up feature flags */
	if (adapter->netdev->features & NETIF_F_RXCSUM)
		devRead->misc.uptFeatures |= UPT1_F_RXCSUM;

	if (adapter->netdev->features & NETIF_F_LRO) {
		devRead->misc.uptFeatures |= UPT1_F_LRO;
		devRead->misc.maxNumRxSG = cpu_to_le16(1 + MAX_SKB_FRAGS);
	}
	if (adapter->netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
		devRead->misc.uptFeatures |= UPT1_F_RXVLAN;

	devRead->misc.mtu = cpu_to_le32(adapter->netdev->mtu);
	devRead->misc.queueDescPA = cpu_to_le64(adapter->queue_desc_pa);
	devRead->misc.queueDescLen = cpu_to_le32(
		adapter->num_tx_queues * sizeof(struct Vmxnet3_TxQueueDesc) +
		adapter->num_rx_queues * sizeof(struct Vmxnet3_RxQueueDesc));

	/* tx queue settings */
	devRead->misc.numTxQueues =  adapter->num_tx_queues;
	for (i = 0; i < adapter->num_tx_queues; i++) {
		struct vmxnet3_tx_queue	*tq = &adapter->tx_queue[i];
		BUG_ON(adapter->tx_queue[i].tx_ring.base == NULL);
		tqc = &adapter->tqd_start[i].conf;
		tqc->txRingBasePA   = cpu_to_le64(tq->tx_ring.basePA);
		tqc->dataRingBasePA = cpu_to_le64(tq->data_ring.basePA);
		tqc->compRingBasePA = cpu_to_le64(tq->comp_ring.basePA);
		tqc->ddPA           = cpu_to_le64(tq->buf_info_pa);
		tqc->txRingSize     = cpu_to_le32(tq->tx_ring.size);
		tqc->dataRingSize   = cpu_to_le32(tq->data_ring.size);
		tqc->txDataRingDescSize = cpu_to_le32(tq->txdata_desc_size);
		tqc->compRingSize   = cpu_to_le32(tq->comp_ring.size);
		tqc->ddLen          = cpu_to_le32(
					sizeof(struct vmxnet3_tx_buf_info) *
					tqc->txRingSize);
		tqc->intrIdx        = tq->comp_ring.intr_idx;
	}

	/* rx queue settings */
	devRead->misc.numRxQueues = adapter->num_rx_queues;
	for (i = 0; i < adapter->num_rx_queues; i++) {
		struct vmxnet3_rx_queue	*rq = &adapter->rx_queue[i];
		rqc = &adapter->rqd_start[i].conf;
		rqc->rxRingBasePA[0] = cpu_to_le64(rq->rx_ring[0].basePA);
		rqc->rxRingBasePA[1] = cpu_to_le64(rq->rx_ring[1].basePA);
		rqc->compRingBasePA  = cpu_to_le64(rq->comp_ring.basePA);
		rqc->ddPA            = cpu_to_le64(rq->buf_info_pa);
		rqc->rxRingSize[0]   = cpu_to_le32(rq->rx_ring[0].size);
		rqc->rxRingSize[1]   = cpu_to_le32(rq->rx_ring[1].size);
		rqc->compRingSize    = cpu_to_le32(rq->comp_ring.size);
		rqc->ddLen           = cpu_to_le32(
					sizeof(struct vmxnet3_rx_buf_info) *
					(rqc->rxRingSize[0] +
					 rqc->rxRingSize[1]));
		rqc->intrIdx         = rq->comp_ring.intr_idx;
		if (VMXNET3_VERSION_GE_3(adapter)) {
			rqc->rxDataRingBasePA =
				cpu_to_le64(rq->data_ring.basePA);
			rqc->rxDataRingDescSize =
				cpu_to_le16(rq->data_ring.desc_size);
		}
	}

#ifdef VMXNET3_RSS
	memset(adapter->rss_conf, 0, sizeof(*adapter->rss_conf));

	if (adapter->rss) {
		struct UPT1_RSSConf *rssConf = adapter->rss_conf;

		devRead->misc.uptFeatures |= UPT1_F_RSS;
		devRead->misc.numRxQueues = adapter->num_rx_queues;
		rssConf->hashType = UPT1_RSS_HASH_TYPE_TCP_IPV4 |
				    UPT1_RSS_HASH_TYPE_IPV4 |
				    UPT1_RSS_HASH_TYPE_TCP_IPV6 |
				    UPT1_RSS_HASH_TYPE_IPV6;
		rssConf->hashFunc = UPT1_RSS_HASH_FUNC_TOEPLITZ;
		rssConf->hashKeySize = UPT1_RSS_MAX_KEY_SIZE;
		rssConf->indTableSize = VMXNET3_RSS_IND_TABLE_SIZE;
		netdev_rss_key_fill(rssConf->hashKey, sizeof(rssConf->hashKey));

		for (i = 0; i < rssConf->indTableSize; i++)
			rssConf->indTable[i] = ethtool_rxfh_indir_default(
				i, adapter->num_rx_queues);

		devRead->rssConfDesc.confVer = 1;
		devRead->rssConfDesc.confLen = cpu_to_le32(sizeof(*rssConf));
		devRead->rssConfDesc.confPA =
			cpu_to_le64(adapter->rss_conf_pa);
	}

#endif /* VMXNET3_RSS */

	/* intr settings */
	devRead->intrConf.autoMask = adapter->intr.mask_mode ==
				     VMXNET3_IMM_AUTO;
	devRead->intrConf.numIntrs = adapter->intr.num_intrs;
	for (i = 0; i < adapter->intr.num_intrs; i++)
		devRead->intrConf.modLevels[i] = adapter->intr.mod_levels[i];

	devRead->intrConf.eventIntrIdx = adapter->intr.event_intr_idx;
	devRead->intrConf.intrCtrl |= cpu_to_le32(VMXNET3_IC_DISABLE_ALL);

	/* rx filter settings */
	devRead->rxFilterConf.rxMode = 0;
	vmxnet3_restore_vlan(adapter);
	vmxnet3_write_mac_addr(adapter, adapter->netdev->dev_addr);

	/* the rest are already zeroed */
}

static void
vmxnet3_init_coalesce(struct vmxnet3_adapter *adapter)
{
	struct Vmxnet3_DriverShared *shared = adapter->shared;
	union Vmxnet3_CmdInfo *cmdInfo = &shared->cu.cmdInfo;
	unsigned long flags;

	if (!VMXNET3_VERSION_GE_3(adapter))
		return;

	spin_lock_irqsave(&adapter->cmd_lock, flags);
	cmdInfo->varConf.confVer = 1;
	cmdInfo->varConf.confLen =
		cpu_to_le32(sizeof(*adapter->coal_conf));
	cmdInfo->varConf.confPA  = cpu_to_le64(adapter->coal_conf_pa);

	if (adapter->default_coal_mode) {
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_GET_COALESCE);
	} else {
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_SET_COALESCE);
	}

	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
}

int
vmxnet3_activate_dev(struct vmxnet3_adapter *adapter)
{
	int err, i;
	u32 ret;
	unsigned long flags;

	netdev_dbg(adapter->netdev, "%s: skb_buf_size %d, rx_buf_per_pkt %d,"
		" ring sizes %u %u %u\n", adapter->netdev->name,
		adapter->skb_buf_size, adapter->rx_buf_per_pkt,
		adapter->tx_queue[0].tx_ring.size,
		adapter->rx_queue[0].rx_ring[0].size,
		adapter->rx_queue[0].rx_ring[1].size);

	vmxnet3_tq_init_all(adapter);
	err = vmxnet3_rq_init_all(adapter);
	if (err) {
		netdev_err(adapter->netdev,
			   "Failed to init rx queue error %d\n", err);
		goto rq_err;
	}

	err = vmxnet3_request_irqs(adapter);
	if (err) {
		netdev_err(adapter->netdev,
			   "Failed to setup irq for error %d\n", err);
		goto irq_err;
	}

	vmxnet3_setup_driver_shared(adapter);

	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_DSAL, VMXNET3_GET_ADDR_LO(
			       adapter->shared_pa));
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_DSAH, VMXNET3_GET_ADDR_HI(
			       adapter->shared_pa));
	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_ACTIVATE_DEV);
	ret = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);

	if (ret != 0) {
		netdev_err(adapter->netdev,
			   "Failed to activate dev: error %u\n", ret);
		err = -EINVAL;
		goto activate_err;
	}

	vmxnet3_init_coalesce(adapter);

	for (i = 0; i < adapter->num_rx_queues; i++) {
		VMXNET3_WRITE_BAR0_REG(adapter,
				VMXNET3_REG_RXPROD + i * VMXNET3_REG_ALIGN,
				adapter->rx_queue[i].rx_ring[0].next2fill);
		VMXNET3_WRITE_BAR0_REG(adapter, (VMXNET3_REG_RXPROD2 +
				(i * VMXNET3_REG_ALIGN)),
				adapter->rx_queue[i].rx_ring[1].next2fill);
	}

	/* Apply the rx filter settins last. */
	vmxnet3_set_mc(adapter->netdev);

	/*
	 * Check link state when first activating device. It will start the
	 * tx queue if the link is up.
	 */
	vmxnet3_check_link(adapter, true);
	for (i = 0; i < adapter->num_rx_queues; i++)
		napi_enable(&adapter->rx_queue[i].napi);
	vmxnet3_enable_all_intrs(adapter);
	clear_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state);
	return 0;

activate_err:
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_DSAL, 0);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_DSAH, 0);
	vmxnet3_free_irqs(adapter);
irq_err:
rq_err:
	/* free up buffers we allocated */
	vmxnet3_rq_cleanup_all(adapter);
	return err;
}


void
vmxnet3_reset_dev(struct vmxnet3_adapter *adapter)
{
	unsigned long flags;
	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD, VMXNET3_CMD_RESET_DEV);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
}


int
vmxnet3_quiesce_dev(struct vmxnet3_adapter *adapter)
{
	int i;
	unsigned long flags;
	if (test_and_set_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state))
		return 0;


	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_QUIESCE_DEV);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	vmxnet3_disable_all_intrs(adapter);

	for (i = 0; i < adapter->num_rx_queues; i++)
		napi_disable(&adapter->rx_queue[i].napi);
	netif_tx_disable(adapter->netdev);
	adapter->link_speed = 0;
	netif_carrier_off(adapter->netdev);

	vmxnet3_tq_cleanup_all(adapter);
	vmxnet3_rq_cleanup_all(adapter);
	vmxnet3_free_irqs(adapter);
	return 0;
}


static void
vmxnet3_write_mac_addr(struct vmxnet3_adapter *adapter, u8 *mac)
{
	u32 tmp;

	tmp = *(u32 *)mac;
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_MACL, tmp);

	tmp = (mac[5] << 8) | mac[4];
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_MACH, tmp);
}


static int
vmxnet3_set_mac_addr(struct net_device *netdev, void *p)
{
	struct sockaddr *addr = p;
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	vmxnet3_write_mac_addr(adapter, addr->sa_data);

	return 0;
}


/* ==================== initialization and cleanup routines ============ */

static int
vmxnet3_alloc_pci_resources(struct vmxnet3_adapter *adapter)
{
	int err;
	unsigned long mmio_start, mmio_len;
	struct pci_dev *pdev = adapter->pdev;

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "Failed to enable adapter: error %d\n", err);
		return err;
	}

	err = pci_request_selected_regions(pdev, (1 << 2) - 1,
					   vmxnet3_driver_name);
	if (err) {
		dev_err(&pdev->dev,
			"Failed to request region for adapter: error %d\n", err);
		goto err_enable_device;
	}

	pci_set_master(pdev);

	mmio_start = pci_resource_start(pdev, 0);
	mmio_len = pci_resource_len(pdev, 0);
	adapter->hw_addr0 = ioremap(mmio_start, mmio_len);
	if (!adapter->hw_addr0) {
		dev_err(&pdev->dev, "Failed to map bar0\n");
		err = -EIO;
		goto err_ioremap;
	}

	mmio_start = pci_resource_start(pdev, 1);
	mmio_len = pci_resource_len(pdev, 1);
	adapter->hw_addr1 = ioremap(mmio_start, mmio_len);
	if (!adapter->hw_addr1) {
		dev_err(&pdev->dev, "Failed to map bar1\n");
		err = -EIO;
		goto err_bar1;
	}
	return 0;

err_bar1:
	iounmap(adapter->hw_addr0);
err_ioremap:
	pci_release_selected_regions(pdev, (1 << 2) - 1);
err_enable_device:
	pci_disable_device(pdev);
	return err;
}


static void
vmxnet3_free_pci_resources(struct vmxnet3_adapter *adapter)
{
	BUG_ON(!adapter->pdev);

	iounmap(adapter->hw_addr0);
	iounmap(adapter->hw_addr1);
	pci_release_selected_regions(adapter->pdev, (1 << 2) - 1);
	pci_disable_device(adapter->pdev);
}


static void
vmxnet3_adjust_rx_ring_size(struct vmxnet3_adapter *adapter)
{
	size_t sz, i, ring0_size, ring1_size, comp_size;
	if (adapter->netdev->mtu <= VMXNET3_MAX_SKB_BUF_SIZE -
				    VMXNET3_MAX_ETH_HDR_SIZE) {
		adapter->skb_buf_size = adapter->netdev->mtu +
					VMXNET3_MAX_ETH_HDR_SIZE;
		if (adapter->skb_buf_size < VMXNET3_MIN_T0_BUF_SIZE)
			adapter->skb_buf_size = VMXNET3_MIN_T0_BUF_SIZE;

		adapter->rx_buf_per_pkt = 1;
	} else {
		adapter->skb_buf_size = VMXNET3_MAX_SKB_BUF_SIZE;
		sz = adapter->netdev->mtu - VMXNET3_MAX_SKB_BUF_SIZE +
					    VMXNET3_MAX_ETH_HDR_SIZE;
		adapter->rx_buf_per_pkt = 1 + (sz + PAGE_SIZE - 1) / PAGE_SIZE;
	}

	/*
	 * for simplicity, force the ring0 size to be a multiple of
	 * rx_buf_per_pkt * VMXNET3_RING_SIZE_ALIGN
	 */
	sz = adapter->rx_buf_per_pkt * VMXNET3_RING_SIZE_ALIGN;
	ring0_size = adapter->rx_queue[0].rx_ring[0].size;
	ring0_size = (ring0_size + sz - 1) / sz * sz;
	ring0_size = min_t(u32, ring0_size, VMXNET3_RX_RING_MAX_SIZE /
			   sz * sz);
	ring1_size = adapter->rx_queue[0].rx_ring[1].size;
	ring1_size = (ring1_size + sz - 1) / sz * sz;
	ring1_size = min_t(u32, ring1_size, VMXNET3_RX_RING2_MAX_SIZE /
			   sz * sz);
	comp_size = ring0_size + ring1_size;

	for (i = 0; i < adapter->num_rx_queues; i++) {
		struct vmxnet3_rx_queue	*rq = &adapter->rx_queue[i];

		rq->rx_ring[0].size = ring0_size;
		rq->rx_ring[1].size = ring1_size;
		rq->comp_ring.size = comp_size;
	}
}


int
vmxnet3_create_queues(struct vmxnet3_adapter *adapter, u32 tx_ring_size,
		      u32 rx_ring_size, u32 rx_ring2_size,
		      u16 txdata_desc_size, u16 rxdata_desc_size)
{
	int err = 0, i;

	for (i = 0; i < adapter->num_tx_queues; i++) {
		struct vmxnet3_tx_queue	*tq = &adapter->tx_queue[i];
		tq->tx_ring.size   = tx_ring_size;
		tq->data_ring.size = tx_ring_size;
		tq->comp_ring.size = tx_ring_size;
		tq->txdata_desc_size = txdata_desc_size;
		tq->shared = &adapter->tqd_start[i].ctrl;
		tq->stopped = true;
		tq->adapter = adapter;
		tq->qid = i;
		err = vmxnet3_tq_create(tq, adapter);
		/*
		 * Too late to change num_tx_queues. We cannot do away with
		 * lesser number of queues than what we asked for
		 */
		if (err)
			goto queue_err;
	}

	adapter->rx_queue[0].rx_ring[0].size = rx_ring_size;
	adapter->rx_queue[0].rx_ring[1].size = rx_ring2_size;
	vmxnet3_adjust_rx_ring_size(adapter);

	adapter->rxdataring_enabled = VMXNET3_VERSION_GE_3(adapter);
	for (i = 0; i < adapter->num_rx_queues; i++) {
		struct vmxnet3_rx_queue *rq = &adapter->rx_queue[i];
		/* qid and qid2 for rx queues will be assigned later when num
		 * of rx queues is finalized after allocating intrs */
		rq->shared = &adapter->rqd_start[i].ctrl;
		rq->adapter = adapter;
		rq->data_ring.desc_size = rxdata_desc_size;
		err = vmxnet3_rq_create(rq, adapter);
		if (err) {
			if (i == 0) {
				netdev_err(adapter->netdev,
					   "Could not allocate any rx queues. "
					   "Aborting.\n");
				goto queue_err;
			} else {
				netdev_info(adapter->netdev,
					    "Number of rx queues changed "
					    "to : %d.\n", i);
				adapter->num_rx_queues = i;
				err = 0;
				break;
			}
		}
	}

	if (!adapter->rxdataring_enabled)
		vmxnet3_rq_destroy_all_rxdataring(adapter);

	return err;
queue_err:
	vmxnet3_tq_destroy_all(adapter);
	return err;
}

static int
vmxnet3_open(struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter;
	int err, i;

	adapter = netdev_priv(netdev);

	for (i = 0; i < adapter->num_tx_queues; i++)
		spin_lock_init(&adapter->tx_queue[i].tx_lock);

	if (VMXNET3_VERSION_GE_3(adapter)) {
		unsigned long flags;
		u16 txdata_desc_size;

		spin_lock_irqsave(&adapter->cmd_lock, flags);
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
				       VMXNET3_CMD_GET_TXDATA_DESC_SIZE);
		txdata_desc_size = VMXNET3_READ_BAR1_REG(adapter,
							 VMXNET3_REG_CMD);
		spin_unlock_irqrestore(&adapter->cmd_lock, flags);

		if ((txdata_desc_size < VMXNET3_TXDATA_DESC_MIN_SIZE) ||
		    (txdata_desc_size > VMXNET3_TXDATA_DESC_MAX_SIZE) ||
		    (txdata_desc_size & VMXNET3_TXDATA_DESC_SIZE_MASK)) {
			adapter->txdata_desc_size =
				sizeof(struct Vmxnet3_TxDataDesc);
		} else {
			adapter->txdata_desc_size = txdata_desc_size;
		}
	} else {
		adapter->txdata_desc_size = sizeof(struct Vmxnet3_TxDataDesc);
	}

	err = vmxnet3_create_queues(adapter,
				    adapter->tx_ring_size,
				    adapter->rx_ring_size,
				    adapter->rx_ring2_size,
				    adapter->txdata_desc_size,
				    adapter->rxdata_desc_size);
	if (err)
		goto queue_err;

	err = vmxnet3_activate_dev(adapter);
	if (err)
		goto activate_err;

	return 0;

activate_err:
	vmxnet3_rq_destroy_all(adapter);
	vmxnet3_tq_destroy_all(adapter);
queue_err:
	return err;
}


static int
vmxnet3_close(struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	/*
	 * Reset_work may be in the middle of resetting the device, wait for its
	 * completion.
	 */
	while (test_and_set_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state))
		usleep_range(1000, 2000);

	vmxnet3_quiesce_dev(adapter);

	vmxnet3_rq_destroy_all(adapter);
	vmxnet3_tq_destroy_all(adapter);

	clear_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state);


	return 0;
}


void
vmxnet3_force_close(struct vmxnet3_adapter *adapter)
{
	int i;

	/*
	 * we must clear VMXNET3_STATE_BIT_RESETTING, otherwise
	 * vmxnet3_close() will deadlock.
	 */
	BUG_ON(test_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state));

	/* we need to enable NAPI, otherwise dev_close will deadlock */
	for (i = 0; i < adapter->num_rx_queues; i++)
		napi_enable(&adapter->rx_queue[i].napi);
	/*
	 * Need to clear the quiesce bit to ensure that vmxnet3_close
	 * can quiesce the device properly
	 */
	clear_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state);
	dev_close(adapter->netdev);
}


static int
vmxnet3_change_mtu(struct net_device *netdev, int new_mtu)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	int err = 0;

	netdev->mtu = new_mtu;

	/*
	 * Reset_work may be in the middle of resetting the device, wait for its
	 * completion.
	 */
	while (test_and_set_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state))
		usleep_range(1000, 2000);

	if (netif_running(netdev)) {
		vmxnet3_quiesce_dev(adapter);
		vmxnet3_reset_dev(adapter);

		/* we need to re-create the rx queue based on the new mtu */
		vmxnet3_rq_destroy_all(adapter);
		vmxnet3_adjust_rx_ring_size(adapter);
		err = vmxnet3_rq_create_all(adapter);
		if (err) {
			netdev_err(netdev,
				   "failed to re-create rx queues, "
				   " error %d. Closing it.\n", err);
			goto out;
		}

		err = vmxnet3_activate_dev(adapter);
		if (err) {
			netdev_err(netdev,
				   "failed to re-activate, error %d. "
				   "Closing it\n", err);
			goto out;
		}
	}

out:
	clear_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state);
	if (err)
		vmxnet3_force_close(adapter);

	return err;
}


static void
vmxnet3_declare_features(struct vmxnet3_adapter *adapter, bool dma64)
{
	struct net_device *netdev = adapter->netdev;

	netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
		NETIF_F_HW_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
		NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_TSO | NETIF_F_TSO6 |
		NETIF_F_LRO;
	if (dma64)
		netdev->hw_features |= NETIF_F_HIGHDMA;
	netdev->vlan_features = netdev->hw_features &
				~(NETIF_F_HW_VLAN_CTAG_TX |
				  NETIF_F_HW_VLAN_CTAG_RX);
	netdev->features = netdev->hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
}


static void
vmxnet3_read_mac_addr(struct vmxnet3_adapter *adapter, u8 *mac)
{
	u32 tmp;

	tmp = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_MACL);
	*(u32 *)mac = tmp;

	tmp = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_MACH);
	mac[4] = tmp & 0xff;
	mac[5] = (tmp >> 8) & 0xff;
}

#ifdef CONFIG_PCI_MSI

/*
 * Enable MSIx vectors.
 * Returns :
 *	VMXNET3_LINUX_MIN_MSIX_VECT when only minimum number of vectors required
 *	 were enabled.
 *	number of vectors which were enabled otherwise (this number is greater
 *	 than VMXNET3_LINUX_MIN_MSIX_VECT)
 */

static int
vmxnet3_acquire_msix_vectors(struct vmxnet3_adapter *adapter, int nvec)
{
	int ret = pci_enable_msix_range(adapter->pdev,
					adapter->intr.msix_entries, nvec, nvec);

	if (ret == -ENOSPC && nvec > VMXNET3_LINUX_MIN_MSIX_VECT) {
		dev_err(&adapter->netdev->dev,
			"Failed to enable %d MSI-X, trying %d\n",
			nvec, VMXNET3_LINUX_MIN_MSIX_VECT);

		ret = pci_enable_msix_range(adapter->pdev,
					    adapter->intr.msix_entries,
					    VMXNET3_LINUX_MIN_MSIX_VECT,
					    VMXNET3_LINUX_MIN_MSIX_VECT);
	}

	if (ret < 0) {
		dev_err(&adapter->netdev->dev,
			"Failed to enable MSI-X, error: %d\n", ret);
	}

	return ret;
}


#endif /* CONFIG_PCI_MSI */

static void
vmxnet3_alloc_intr_resources(struct vmxnet3_adapter *adapter)
{
	u32 cfg;
	unsigned long flags;

	/* intr settings */
	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_GET_CONF_INTR);
	cfg = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	adapter->intr.type = cfg & 0x3;
	adapter->intr.mask_mode = (cfg >> 2) & 0x3;

	if (adapter->intr.type == VMXNET3_IT_AUTO) {
		adapter->intr.type = VMXNET3_IT_MSIX;
	}

#ifdef CONFIG_PCI_MSI
	if (adapter->intr.type == VMXNET3_IT_MSIX) {
		int i, nvec;

		nvec  = adapter->share_intr == VMXNET3_INTR_TXSHARE ?
			1 : adapter->num_tx_queues;
		nvec += adapter->share_intr == VMXNET3_INTR_BUDDYSHARE ?
			0 : adapter->num_rx_queues;
		nvec += 1;	/* for link event */
		nvec = nvec > VMXNET3_LINUX_MIN_MSIX_VECT ?
		       nvec : VMXNET3_LINUX_MIN_MSIX_VECT;

		for (i = 0; i < nvec; i++)
			adapter->intr.msix_entries[i].entry = i;

		nvec = vmxnet3_acquire_msix_vectors(adapter, nvec);
		if (nvec < 0)
			goto msix_err;

		/* If we cannot allocate one MSIx vector per queue
		 * then limit the number of rx queues to 1
		 */
		if (nvec == VMXNET3_LINUX_MIN_MSIX_VECT) {
			if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE
			    || adapter->num_rx_queues != 1) {
				adapter->share_intr = VMXNET3_INTR_TXSHARE;
				netdev_err(adapter->netdev,
					   "Number of rx queues : 1\n");
				adapter->num_rx_queues = 1;
			}
		}

		adapter->intr.num_intrs = nvec;
		return;

msix_err:
		/* If we cannot allocate MSIx vectors use only one rx queue */
		dev_info(&adapter->pdev->dev,
			 "Failed to enable MSI-X, error %d. "
			 "Limiting #rx queues to 1, try MSI.\n", nvec);

		adapter->intr.type = VMXNET3_IT_MSI;
	}

	if (adapter->intr.type == VMXNET3_IT_MSI) {
		if (!pci_enable_msi(adapter->pdev)) {
			adapter->num_rx_queues = 1;
			adapter->intr.num_intrs = 1;
			return;
		}
	}
#endif /* CONFIG_PCI_MSI */

	adapter->num_rx_queues = 1;
	dev_info(&adapter->netdev->dev,
		 "Using INTx interrupt, #Rx queues: 1.\n");
	adapter->intr.type = VMXNET3_IT_INTX;

	/* INT-X related setting */
	adapter->intr.num_intrs = 1;
}


static void
vmxnet3_free_intr_resources(struct vmxnet3_adapter *adapter)
{
	if (adapter->intr.type == VMXNET3_IT_MSIX)
		pci_disable_msix(adapter->pdev);
	else if (adapter->intr.type == VMXNET3_IT_MSI)
		pci_disable_msi(adapter->pdev);
	else
		BUG_ON(adapter->intr.type != VMXNET3_IT_INTX);
}


static void
vmxnet3_tx_timeout(struct net_device *netdev)
{
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	adapter->tx_timeout_count++;

	netdev_err(adapter->netdev, "tx hang\n");
	schedule_work(&adapter->work);
}


static void
vmxnet3_reset_work(struct work_struct *data)
{
	struct vmxnet3_adapter *adapter;

	adapter = container_of(data, struct vmxnet3_adapter, work);

	/* if another thread is resetting the device, no need to proceed */
	if (test_and_set_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state))
		return;

	/* if the device is closed, we must leave it alone */
	rtnl_lock();
	if (netif_running(adapter->netdev)) {
		netdev_notice(adapter->netdev, "resetting\n");
		vmxnet3_quiesce_dev(adapter);
		vmxnet3_reset_dev(adapter);
		vmxnet3_activate_dev(adapter);
	} else {
		netdev_info(adapter->netdev, "already closed\n");
	}
	rtnl_unlock();

	netif_wake_queue(adapter->netdev);
	clear_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state);
}


static int
vmxnet3_probe_device(struct pci_dev *pdev,
		     const struct pci_device_id *id)
{
	static const struct net_device_ops vmxnet3_netdev_ops = {
		.ndo_open = vmxnet3_open,
		.ndo_stop = vmxnet3_close,
		.ndo_start_xmit = vmxnet3_xmit_frame,
		.ndo_set_mac_address = vmxnet3_set_mac_addr,
		.ndo_change_mtu = vmxnet3_change_mtu,
		.ndo_fix_features = vmxnet3_fix_features,
		.ndo_set_features = vmxnet3_set_features,
		.ndo_get_stats64 = vmxnet3_get_stats64,
		.ndo_tx_timeout = vmxnet3_tx_timeout,
		.ndo_set_rx_mode = vmxnet3_set_mc,
		.ndo_vlan_rx_add_vid = vmxnet3_vlan_rx_add_vid,
		.ndo_vlan_rx_kill_vid = vmxnet3_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
		.ndo_poll_controller = vmxnet3_netpoll,
#endif
	};
	int err;
	bool dma64;
	u32 ver;
	struct net_device *netdev;
	struct vmxnet3_adapter *adapter;
	u8 mac[ETH_ALEN];
	int size;
	int num_tx_queues;
	int num_rx_queues;

	if (!pci_msi_enabled())
		enable_mq = 0;

#ifdef VMXNET3_RSS
	if (enable_mq)
		num_rx_queues = min(VMXNET3_DEVICE_MAX_RX_QUEUES,
				    (int)num_online_cpus());
	else
#endif
		num_rx_queues = 1;
	num_rx_queues = rounddown_pow_of_two(num_rx_queues);

	if (enable_mq)
		num_tx_queues = min(VMXNET3_DEVICE_MAX_TX_QUEUES,
				    (int)num_online_cpus());
	else
		num_tx_queues = 1;

	num_tx_queues = rounddown_pow_of_two(num_tx_queues);
	netdev = alloc_etherdev_mq(sizeof(struct vmxnet3_adapter),
				   max(num_tx_queues, num_rx_queues));
	dev_info(&pdev->dev,
		 "# of Tx queues : %d, # of Rx queues : %d\n",
		 num_tx_queues, num_rx_queues);

	if (!netdev)
		return -ENOMEM;

	pci_set_drvdata(pdev, netdev);
	adapter = netdev_priv(netdev);
	adapter->netdev = netdev;
	adapter->pdev = pdev;

	adapter->tx_ring_size = VMXNET3_DEF_TX_RING_SIZE;
	adapter->rx_ring_size = VMXNET3_DEF_RX_RING_SIZE;
	adapter->rx_ring2_size = VMXNET3_DEF_RX_RING2_SIZE;

	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
		if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) {
			dev_err(&pdev->dev,
				"pci_set_consistent_dma_mask failed\n");
			err = -EIO;
			goto err_set_mask;
		}
		dma64 = true;
	} else {
		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) {
			dev_err(&pdev->dev,
				"pci_set_dma_mask failed\n");
			err = -EIO;
			goto err_set_mask;
		}
		dma64 = false;
	}

	spin_lock_init(&adapter->cmd_lock);
	adapter->adapter_pa = dma_map_single(&adapter->pdev->dev, adapter,
					     sizeof(struct vmxnet3_adapter),
					     PCI_DMA_TODEVICE);
	if (dma_mapping_error(&adapter->pdev->dev, adapter->adapter_pa)) {
		dev_err(&pdev->dev, "Failed to map dma\n");
		err = -EFAULT;
		goto err_set_mask;
	}
	adapter->shared = dma_alloc_coherent(
				&adapter->pdev->dev,
				sizeof(struct Vmxnet3_DriverShared),
				&adapter->shared_pa, GFP_KERNEL);
	if (!adapter->shared) {
		dev_err(&pdev->dev, "Failed to allocate memory\n");
		err = -ENOMEM;
		goto err_alloc_shared;
	}

	adapter->num_rx_queues = num_rx_queues;
	adapter->num_tx_queues = num_tx_queues;
	adapter->rx_buf_per_pkt = 1;

	size = sizeof(struct Vmxnet3_TxQueueDesc) * adapter->num_tx_queues;
	size += sizeof(struct Vmxnet3_RxQueueDesc) * adapter->num_rx_queues;
	adapter->tqd_start = dma_alloc_coherent(&adapter->pdev->dev, size,
						&adapter->queue_desc_pa,
						GFP_KERNEL);

	if (!adapter->tqd_start) {
		dev_err(&pdev->dev, "Failed to allocate memory\n");
		err = -ENOMEM;
		goto err_alloc_queue_desc;
	}
	adapter->rqd_start = (struct Vmxnet3_RxQueueDesc *)(adapter->tqd_start +
							    adapter->num_tx_queues);

	adapter->pm_conf = dma_alloc_coherent(&adapter->pdev->dev,
					      sizeof(struct Vmxnet3_PMConf),
					      &adapter->pm_conf_pa,
					      GFP_KERNEL);
	if (adapter->pm_conf == NULL) {
		err = -ENOMEM;
		goto err_alloc_pm;
	}

#ifdef VMXNET3_RSS

	adapter->rss_conf = dma_alloc_coherent(&adapter->pdev->dev,
					       sizeof(struct UPT1_RSSConf),
					       &adapter->rss_conf_pa,
					       GFP_KERNEL);
	if (adapter->rss_conf == NULL) {
		err = -ENOMEM;
		goto err_alloc_rss;
	}
#endif /* VMXNET3_RSS */

	err = vmxnet3_alloc_pci_resources(adapter);
	if (err < 0)
		goto err_alloc_pci;

	ver = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_VRRS);
	if (ver & (1 << VMXNET3_REV_3)) {
		VMXNET3_WRITE_BAR1_REG(adapter,
				       VMXNET3_REG_VRRS,
				       1 << VMXNET3_REV_3);
		adapter->version = VMXNET3_REV_3 + 1;
	} else if (ver & (1 << VMXNET3_REV_2)) {
		VMXNET3_WRITE_BAR1_REG(adapter,
				       VMXNET3_REG_VRRS,
				       1 << VMXNET3_REV_2);
		adapter->version = VMXNET3_REV_2 + 1;
	} else if (ver & (1 << VMXNET3_REV_1)) {
		VMXNET3_WRITE_BAR1_REG(adapter,
				       VMXNET3_REG_VRRS,
				       1 << VMXNET3_REV_1);
		adapter->version = VMXNET3_REV_1 + 1;
	} else {
		dev_err(&pdev->dev,
			"Incompatible h/w version (0x%x) for adapter\n", ver);
		err = -EBUSY;
		goto err_ver;
	}
	dev_dbg(&pdev->dev, "Using device version %d\n", adapter->version);

	ver = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_UVRS);
	if (ver & 1) {
		VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_UVRS, 1);
	} else {
		dev_err(&pdev->dev,
			"Incompatible upt version (0x%x) for adapter\n", ver);
		err = -EBUSY;
		goto err_ver;
	}

	if (VMXNET3_VERSION_GE_3(adapter)) {
		adapter->coal_conf =
			dma_alloc_coherent(&adapter->pdev->dev,
					   sizeof(struct Vmxnet3_CoalesceScheme)
					   ,
					   &adapter->coal_conf_pa,
					   GFP_KERNEL);
		if (!adapter->coal_conf) {
			err = -ENOMEM;
			goto err_ver;
		}
		adapter->coal_conf->coalMode = VMXNET3_COALESCE_DISABLED;
		adapter->default_coal_mode = true;
	}

	SET_NETDEV_DEV(netdev, &pdev->dev);
	vmxnet3_declare_features(adapter, dma64);

	adapter->rxdata_desc_size = VMXNET3_VERSION_GE_3(adapter) ?
		VMXNET3_DEF_RXDATA_DESC_SIZE : 0;

	if (adapter->num_tx_queues == adapter->num_rx_queues)
		adapter->share_intr = VMXNET3_INTR_BUDDYSHARE;
	else
		adapter->share_intr = VMXNET3_INTR_DONTSHARE;

	vmxnet3_alloc_intr_resources(adapter);

#ifdef VMXNET3_RSS
	if (adapter->num_rx_queues > 1 &&
	    adapter->intr.type == VMXNET3_IT_MSIX) {
		adapter->rss = true;
		netdev->hw_features |= NETIF_F_RXHASH;
		netdev->features |= NETIF_F_RXHASH;
		dev_dbg(&pdev->dev, "RSS is enabled.\n");
	} else {
		adapter->rss = false;
	}
#endif

	vmxnet3_read_mac_addr(adapter, mac);
	memcpy(netdev->dev_addr,  mac, netdev->addr_len);

	netdev->netdev_ops = &vmxnet3_netdev_ops;
	vmxnet3_set_ethtool_ops(netdev);
	netdev->watchdog_timeo = 5 * HZ;

	/* MTU range: 60 - 9000 */
	netdev->min_mtu = VMXNET3_MIN_MTU;
	netdev->max_mtu = VMXNET3_MAX_MTU;

	INIT_WORK(&adapter->work, vmxnet3_reset_work);
	set_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state);

	if (adapter->intr.type == VMXNET3_IT_MSIX) {
		int i;
		for (i = 0; i < adapter->num_rx_queues; i++) {
			netif_napi_add(adapter->netdev,
				       &adapter->rx_queue[i].napi,
				       vmxnet3_poll_rx_only, 64);
		}
	} else {
		netif_napi_add(adapter->netdev, &adapter->rx_queue[0].napi,
			       vmxnet3_poll, 64);
	}

	netif_set_real_num_tx_queues(adapter->netdev, adapter->num_tx_queues);
	netif_set_real_num_rx_queues(adapter->netdev, adapter->num_rx_queues);

	netif_carrier_off(netdev);
	err = register_netdev(netdev);

	if (err) {
		dev_err(&pdev->dev, "Failed to register adapter\n");
		goto err_register;
	}

	vmxnet3_check_link(adapter, false);
	return 0;

err_register:
	if (VMXNET3_VERSION_GE_3(adapter)) {
		dma_free_coherent(&adapter->pdev->dev,
				  sizeof(struct Vmxnet3_CoalesceScheme),
				  adapter->coal_conf, adapter->coal_conf_pa);
	}
	vmxnet3_free_intr_resources(adapter);
err_ver:
	vmxnet3_free_pci_resources(adapter);
err_alloc_pci:
#ifdef VMXNET3_RSS
	dma_free_coherent(&adapter->pdev->dev, sizeof(struct UPT1_RSSConf),
			  adapter->rss_conf, adapter->rss_conf_pa);
err_alloc_rss:
#endif
	dma_free_coherent(&adapter->pdev->dev, sizeof(struct Vmxnet3_PMConf),
			  adapter->pm_conf, adapter->pm_conf_pa);
err_alloc_pm:
	dma_free_coherent(&adapter->pdev->dev, size, adapter->tqd_start,
			  adapter->queue_desc_pa);
err_alloc_queue_desc:
	dma_free_coherent(&adapter->pdev->dev,
			  sizeof(struct Vmxnet3_DriverShared),
			  adapter->shared, adapter->shared_pa);
err_alloc_shared:
	dma_unmap_single(&adapter->pdev->dev, adapter->adapter_pa,
			 sizeof(struct vmxnet3_adapter), PCI_DMA_TODEVICE);
err_set_mask:
	free_netdev(netdev);
	return err;
}


static void
vmxnet3_remove_device(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	int size = 0;
	int num_rx_queues;

#ifdef VMXNET3_RSS
	if (enable_mq)
		num_rx_queues = min(VMXNET3_DEVICE_MAX_RX_QUEUES,
				    (int)num_online_cpus());
	else
#endif
		num_rx_queues = 1;
	num_rx_queues = rounddown_pow_of_two(num_rx_queues);

	cancel_work_sync(&adapter->work);

	unregister_netdev(netdev);

	vmxnet3_free_intr_resources(adapter);
	vmxnet3_free_pci_resources(adapter);
	if (VMXNET3_VERSION_GE_3(adapter)) {
		dma_free_coherent(&adapter->pdev->dev,
				  sizeof(struct Vmxnet3_CoalesceScheme),
				  adapter->coal_conf, adapter->coal_conf_pa);
	}
#ifdef VMXNET3_RSS
	dma_free_coherent(&adapter->pdev->dev, sizeof(struct UPT1_RSSConf),
			  adapter->rss_conf, adapter->rss_conf_pa);
#endif
	dma_free_coherent(&adapter->pdev->dev, sizeof(struct Vmxnet3_PMConf),
			  adapter->pm_conf, adapter->pm_conf_pa);

	size = sizeof(struct Vmxnet3_TxQueueDesc) * adapter->num_tx_queues;
	size += sizeof(struct Vmxnet3_RxQueueDesc) * num_rx_queues;
	dma_free_coherent(&adapter->pdev->dev, size, adapter->tqd_start,
			  adapter->queue_desc_pa);
	dma_free_coherent(&adapter->pdev->dev,
			  sizeof(struct Vmxnet3_DriverShared),
			  adapter->shared, adapter->shared_pa);
	dma_unmap_single(&adapter->pdev->dev, adapter->adapter_pa,
			 sizeof(struct vmxnet3_adapter), PCI_DMA_TODEVICE);
	free_netdev(netdev);
}

static void vmxnet3_shutdown_device(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;

	/* Reset_work may be in the middle of resetting the device, wait for its
	 * completion.
	 */
	while (test_and_set_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state))
		usleep_range(1000, 2000);

	if (test_and_set_bit(VMXNET3_STATE_BIT_QUIESCED,
			     &adapter->state)) {
		clear_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state);
		return;
	}
	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_QUIESCE_DEV);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	vmxnet3_disable_all_intrs(adapter);

	clear_bit(VMXNET3_STATE_BIT_RESETTING, &adapter->state);
}


#ifdef CONFIG_PM

static int
vmxnet3_suspend(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
	struct Vmxnet3_PMConf *pmConf;
	struct ethhdr *ehdr;
	struct arphdr *ahdr;
	u8 *arpreq;
	struct in_device *in_dev;
	struct in_ifaddr *ifa;
	unsigned long flags;
	int i = 0;

	if (!netif_running(netdev))
		return 0;

	for (i = 0; i < adapter->num_rx_queues; i++)
		napi_disable(&adapter->rx_queue[i].napi);

	vmxnet3_disable_all_intrs(adapter);
	vmxnet3_free_irqs(adapter);
	vmxnet3_free_intr_resources(adapter);

	netif_device_detach(netdev);

	/* Create wake-up filters. */
	pmConf = adapter->pm_conf;
	memset(pmConf, 0, sizeof(*pmConf));

	if (adapter->wol & WAKE_UCAST) {
		pmConf->filters[i].patternSize = ETH_ALEN;
		pmConf->filters[i].maskSize = 1;
		memcpy(pmConf->filters[i].pattern, netdev->dev_addr, ETH_ALEN);
		pmConf->filters[i].mask[0] = 0x3F; /* LSB ETH_ALEN bits */

		pmConf->wakeUpEvents |= VMXNET3_PM_WAKEUP_FILTER;
		i++;
	}

	if (adapter->wol & WAKE_ARP) {
		rcu_read_lock();

		in_dev = __in_dev_get_rcu(netdev);
		if (!in_dev) {
			rcu_read_unlock();
			goto skip_arp;
		}

		ifa = rcu_dereference(in_dev->ifa_list);
		if (!ifa) {
			rcu_read_unlock();
			goto skip_arp;
		}

		pmConf->filters[i].patternSize = ETH_HLEN + /* Ethernet header*/
			sizeof(struct arphdr) +		/* ARP header */
			2 * ETH_ALEN +		/* 2 Ethernet addresses*/
			2 * sizeof(u32);	/*2 IPv4 addresses */
		pmConf->filters[i].maskSize =
			(pmConf->filters[i].patternSize - 1) / 8 + 1;

		/* ETH_P_ARP in Ethernet header. */
		ehdr = (struct ethhdr *)pmConf->filters[i].pattern;
		ehdr->h_proto = htons(ETH_P_ARP);

		/* ARPOP_REQUEST in ARP header. */
		ahdr = (struct arphdr *)&pmConf->filters[i].pattern[ETH_HLEN];
		ahdr->ar_op = htons(ARPOP_REQUEST);
		arpreq = (u8 *)(ahdr + 1);

		/* The Unicast IPv4 address in 'tip' field. */
		arpreq += 2 * ETH_ALEN + sizeof(u32);
		*(__be32 *)arpreq = ifa->ifa_address;

		rcu_read_unlock();

		/* The mask for the relevant bits. */
		pmConf->filters[i].mask[0] = 0x00;
		pmConf->filters[i].mask[1] = 0x30; /* ETH_P_ARP */
		pmConf->filters[i].mask[2] = 0x30; /* ARPOP_REQUEST */
		pmConf->filters[i].mask[3] = 0x00;
		pmConf->filters[i].mask[4] = 0xC0; /* IPv4 TIP */
		pmConf->filters[i].mask[5] = 0x03; /* IPv4 TIP */

		pmConf->wakeUpEvents |= VMXNET3_PM_WAKEUP_FILTER;
		i++;
	}

skip_arp:
	if (adapter->wol & WAKE_MAGIC)
		pmConf->wakeUpEvents |= VMXNET3_PM_WAKEUP_MAGIC;

	pmConf->numFilters = i;

	adapter->shared->devRead.pmConfDesc.confVer = cpu_to_le32(1);
	adapter->shared->devRead.pmConfDesc.confLen = cpu_to_le32(sizeof(
								  *pmConf));
	adapter->shared->devRead.pmConfDesc.confPA =
		cpu_to_le64(adapter->pm_conf_pa);

	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_UPDATE_PMCFG);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);

	pci_save_state(pdev);
	pci_enable_wake(pdev, pci_choose_state(pdev, PMSG_SUSPEND),
			adapter->wol);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, PMSG_SUSPEND));

	return 0;
}


static int
vmxnet3_resume(struct device *device)
{
	int err;
	unsigned long flags;
	struct pci_dev *pdev = to_pci_dev(device);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct vmxnet3_adapter *adapter = netdev_priv(netdev);

	if (!netif_running(netdev))
		return 0;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	err = pci_enable_device_mem(pdev);
	if (err != 0)
		return err;

	pci_enable_wake(pdev, PCI_D0, 0);

	vmxnet3_alloc_intr_resources(adapter);

	/* During hibernate and suspend, device has to be reinitialized as the
	 * device state need not be preserved.
	 */

	/* Need not check adapter state as other reset tasks cannot run during
	 * device resume.
	 */
	spin_lock_irqsave(&adapter->cmd_lock, flags);
	VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
			       VMXNET3_CMD_QUIESCE_DEV);
	spin_unlock_irqrestore(&adapter->cmd_lock, flags);
	vmxnet3_tq_cleanup_all(adapter);
	vmxnet3_rq_cleanup_all(adapter);

	vmxnet3_reset_dev(adapter);
	err = vmxnet3_activate_dev(adapter);
	if (err != 0) {
		netdev_err(netdev,
			   "failed to re-activate on resume, error: %d", err);
		vmxnet3_force_close(adapter);
		return err;
	}
	netif_device_attach(netdev);

	return 0;
}

static const struct dev_pm_ops vmxnet3_pm_ops = {
	.suspend = vmxnet3_suspend,
	.resume = vmxnet3_resume,
	.freeze = vmxnet3_suspend,
	.restore = vmxnet3_resume,
};
#endif

static struct pci_driver vmxnet3_driver = {
	.name		= vmxnet3_driver_name,
	.id_table	= vmxnet3_pciid_table,
	.probe		= vmxnet3_probe_device,
	.remove		= vmxnet3_remove_device,
	.shutdown	= vmxnet3_shutdown_device,
#ifdef CONFIG_PM
	.driver.pm	= &vmxnet3_pm_ops,
#endif
};


static int __init
vmxnet3_init_module(void)
{
	pr_info("%s - version %s\n", VMXNET3_DRIVER_DESC,
		VMXNET3_DRIVER_VERSION_REPORT);
	return pci_register_driver(&vmxnet3_driver);
}

module_init(vmxnet3_init_module);


static void
vmxnet3_exit_module(void)
{
	pci_unregister_driver(&vmxnet3_driver);
}

module_exit(vmxnet3_exit_module);

MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION(VMXNET3_DRIVER_DESC);
MODULE_LICENSE("GPL v2");
MODULE_VERSION(VMXNET3_DRIVER_VERSION_STRING);