drivers/net/ethernet/nvidia/forcedeth.c

/*
 * forcedeth: Ethernet driver for NVIDIA nForce media access controllers.
 *
 * Note: This driver is a cleanroom reimplementation based on reverse
 *      engineered documentation written by Carl-Daniel Hailfinger
 *      and Andrew de Quincey.
 *
 * NVIDIA, nForce and other NVIDIA marks are trademarks or registered
 * trademarks of NVIDIA Corporation in the United States and other
 * countries.
 *
 * Copyright (C) 2003,4,5 Manfred Spraul
 * Copyright (C) 2004 Andrew de Quincey (wol support)
 * Copyright (C) 2004 Carl-Daniel Hailfinger (invalid MAC handling, insane
 *		IRQ rate fixes, bigendian fixes, cleanups, verification)
 * Copyright (c) 2004,2005,2006,2007,2008,2009 NVIDIA Corporation
 *
 * 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; either version 2 of the License, or
 * (at your option) any 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.  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, see <http://www.gnu.org/licenses/>.
 *
 * Known bugs:
 * We suspect that on some hardware no TX done interrupts are generated.
 * This means recovery from netif_stop_queue only happens if the hw timer
 * interrupt fires (100 times/second, configurable with NVREG_POLL_DEFAULT)
 * and the timer is active in the IRQMask, or if a rx packet arrives by chance.
 * If your hardware reliably generates tx done interrupts, then you can remove
 * DEV_NEED_TIMERIRQ from the driver_data flags.
 * DEV_NEED_TIMERIRQ will not harm you on sane hardware, only generating a few
 * superfluous timer interrupts from the nic.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define FORCEDETH_VERSION		"0.64"
#define DRV_NAME			"forcedeth"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/mii.h>
#include <linux/random.h>
#include <linux/if_vlan.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/prefetch.h>
#include <linux/u64_stats_sync.h>
#include <linux/io.h>

#include <asm/irq.h>

#define TX_WORK_PER_LOOP  64
#define RX_WORK_PER_LOOP  64

/*
 * Hardware access:
 */

#define DEV_NEED_TIMERIRQ          0x0000001  /* set the timer irq flag in the irq mask */
#define DEV_NEED_LINKTIMER         0x0000002  /* poll link settings. Relies on the timer irq */
#define DEV_HAS_LARGEDESC          0x0000004  /* device supports jumbo frames and needs packet format 2 */
#define DEV_HAS_HIGH_DMA           0x0000008  /* device supports 64bit dma */
#define DEV_HAS_CHECKSUM           0x0000010  /* device supports tx and rx checksum offloads */
#define DEV_HAS_VLAN               0x0000020  /* device supports vlan tagging and striping */
#define DEV_HAS_MSI                0x0000040  /* device supports MSI */
#define DEV_HAS_MSI_X              0x0000080  /* device supports MSI-X */
#define DEV_HAS_POWER_CNTRL        0x0000100  /* device supports power savings */
#define DEV_HAS_STATISTICS_V1      0x0000200  /* device supports hw statistics version 1 */
#define DEV_HAS_STATISTICS_V2      0x0000400  /* device supports hw statistics version 2 */
#define DEV_HAS_STATISTICS_V3      0x0000800  /* device supports hw statistics version 3 */
#define DEV_HAS_STATISTICS_V12     0x0000600  /* device supports hw statistics version 1 and 2 */
#define DEV_HAS_STATISTICS_V123    0x0000e00  /* device supports hw statistics version 1, 2, and 3 */
#define DEV_HAS_TEST_EXTENDED      0x0001000  /* device supports extended diagnostic test */
#define DEV_HAS_MGMT_UNIT          0x0002000  /* device supports management unit */
#define DEV_HAS_CORRECT_MACADDR    0x0004000  /* device supports correct mac address order */
#define DEV_HAS_COLLISION_FIX      0x0008000  /* device supports tx collision fix */
#define DEV_HAS_PAUSEFRAME_TX_V1   0x0010000  /* device supports tx pause frames version 1 */
#define DEV_HAS_PAUSEFRAME_TX_V2   0x0020000  /* device supports tx pause frames version 2 */
#define DEV_HAS_PAUSEFRAME_TX_V3   0x0040000  /* device supports tx pause frames version 3 */
#define DEV_NEED_TX_LIMIT          0x0080000  /* device needs to limit tx */
#define DEV_NEED_TX_LIMIT2         0x0180000  /* device needs to limit tx, expect for some revs */
#define DEV_HAS_GEAR_MODE          0x0200000  /* device supports gear mode */
#define DEV_NEED_PHY_INIT_FIX      0x0400000  /* device needs specific phy workaround */
#define DEV_NEED_LOW_POWER_FIX     0x0800000  /* device needs special power up workaround */
#define DEV_NEED_MSI_FIX           0x1000000  /* device needs msi workaround */

enum {
	NvRegIrqStatus = 0x000,
#define NVREG_IRQSTAT_MIIEVENT	0x040
#define NVREG_IRQSTAT_MASK		0x83ff
	NvRegIrqMask = 0x004,
#define NVREG_IRQ_RX_ERROR		0x0001
#define NVREG_IRQ_RX			0x0002
#define NVREG_IRQ_RX_NOBUF		0x0004
#define NVREG_IRQ_TX_ERR		0x0008
#define NVREG_IRQ_TX_OK			0x0010
#define NVREG_IRQ_TIMER			0x0020
#define NVREG_IRQ_LINK			0x0040
#define NVREG_IRQ_RX_FORCED		0x0080
#define NVREG_IRQ_TX_FORCED		0x0100
#define NVREG_IRQ_RECOVER_ERROR		0x8200
#define NVREG_IRQMASK_THROUGHPUT	0x00df
#define NVREG_IRQMASK_CPU		0x0060
#define NVREG_IRQ_TX_ALL		(NVREG_IRQ_TX_ERR|NVREG_IRQ_TX_OK|NVREG_IRQ_TX_FORCED)
#define NVREG_IRQ_RX_ALL		(NVREG_IRQ_RX_ERROR|NVREG_IRQ_RX|NVREG_IRQ_RX_NOBUF|NVREG_IRQ_RX_FORCED)
#define NVREG_IRQ_OTHER			(NVREG_IRQ_TIMER|NVREG_IRQ_LINK|NVREG_IRQ_RECOVER_ERROR)

	NvRegUnknownSetupReg6 = 0x008,
#define NVREG_UNKSETUP6_VAL		3

/*
 * NVREG_POLL_DEFAULT is the interval length of the timer source on the nic
 * NVREG_POLL_DEFAULT=97 would result in an interval length of 1 ms
 */
	NvRegPollingInterval = 0x00c,
#define NVREG_POLL_DEFAULT_THROUGHPUT	65535 /* backup tx cleanup if loop max reached */
#define NVREG_POLL_DEFAULT_CPU	13
	NvRegMSIMap0 = 0x020,
	NvRegMSIMap1 = 0x024,
	NvRegMSIIrqMask = 0x030,
#define NVREG_MSI_VECTOR_0_ENABLED 0x01
	NvRegMisc1 = 0x080,
#define NVREG_MISC1_PAUSE_TX	0x01
#define NVREG_MISC1_HD		0x02
#define NVREG_MISC1_FORCE	0x3b0f3c

	NvRegMacReset = 0x34,
#define NVREG_MAC_RESET_ASSERT	0x0F3
	NvRegTransmitterControl = 0x084,
#define NVREG_XMITCTL_START	0x01
#define NVREG_XMITCTL_MGMT_ST	0x40000000
#define NVREG_XMITCTL_SYNC_MASK		0x000f0000
#define NVREG_XMITCTL_SYNC_NOT_READY	0x0
#define NVREG_XMITCTL_SYNC_PHY_INIT	0x00040000
#define NVREG_XMITCTL_MGMT_SEMA_MASK	0x00000f00
#define NVREG_XMITCTL_MGMT_SEMA_FREE	0x0
#define NVREG_XMITCTL_HOST_SEMA_MASK	0x0000f000
#define NVREG_XMITCTL_HOST_SEMA_ACQ	0x0000f000
#define NVREG_XMITCTL_HOST_LOADED	0x00004000
#define NVREG_XMITCTL_TX_PATH_EN	0x01000000
#define NVREG_XMITCTL_DATA_START	0x00100000
#define NVREG_XMITCTL_DATA_READY	0x00010000
#define NVREG_XMITCTL_DATA_ERROR	0x00020000
	NvRegTransmitterStatus = 0x088,
#define NVREG_XMITSTAT_BUSY	0x01

	NvRegPacketFilterFlags = 0x8c,
#define NVREG_PFF_PAUSE_RX	0x08
#define NVREG_PFF_ALWAYS	0x7F0000
#define NVREG_PFF_PROMISC	0x80
#define NVREG_PFF_MYADDR	0x20
#define NVREG_PFF_LOOPBACK	0x10

	NvRegOffloadConfig = 0x90,
#define NVREG_OFFLOAD_HOMEPHY	0x601
#define NVREG_OFFLOAD_NORMAL	RX_NIC_BUFSIZE
	NvRegReceiverControl = 0x094,
#define NVREG_RCVCTL_START	0x01
#define NVREG_RCVCTL_RX_PATH_EN	0x01000000
	NvRegReceiverStatus = 0x98,
#define NVREG_RCVSTAT_BUSY	0x01

	NvRegSlotTime = 0x9c,
#define NVREG_SLOTTIME_LEGBF_ENABLED	0x80000000
#define NVREG_SLOTTIME_10_100_FULL	0x00007f00
#define NVREG_SLOTTIME_1000_FULL	0x0003ff00
#define NVREG_SLOTTIME_HALF		0x0000ff00
#define NVREG_SLOTTIME_DEFAULT		0x00007f00
#define NVREG_SLOTTIME_MASK		0x000000ff

	NvRegTxDeferral = 0xA0,
#define NVREG_TX_DEFERRAL_DEFAULT		0x15050f
#define NVREG_TX_DEFERRAL_RGMII_10_100		0x16070f
#define NVREG_TX_DEFERRAL_RGMII_1000		0x14050f
#define NVREG_TX_DEFERRAL_RGMII_STRETCH_10	0x16190f
#define NVREG_TX_DEFERRAL_RGMII_STRETCH_100	0x16300f
#define NVREG_TX_DEFERRAL_MII_STRETCH		0x152000
	NvRegRxDeferral = 0xA4,
#define NVREG_RX_DEFERRAL_DEFAULT	0x16
	NvRegMacAddrA = 0xA8,
	NvRegMacAddrB = 0xAC,
	NvRegMulticastAddrA = 0xB0,
#define NVREG_MCASTADDRA_FORCE	0x01
	NvRegMulticastAddrB = 0xB4,
	NvRegMulticastMaskA = 0xB8,
#define NVREG_MCASTMASKA_NONE		0xffffffff
	NvRegMulticastMaskB = 0xBC,
#define NVREG_MCASTMASKB_NONE		0xffff

	NvRegPhyInterface = 0xC0,
#define PHY_RGMII		0x10000000
	NvRegBackOffControl = 0xC4,
#define NVREG_BKOFFCTRL_DEFAULT			0x70000000
#define NVREG_BKOFFCTRL_SEED_MASK		0x000003ff
#define NVREG_BKOFFCTRL_SELECT			24
#define NVREG_BKOFFCTRL_GEAR			12

	NvRegTxRingPhysAddr = 0x100,
	NvRegRxRingPhysAddr = 0x104,
	NvRegRingSizes = 0x108,
#define NVREG_RINGSZ_TXSHIFT 0
#define NVREG_RINGSZ_RXSHIFT 16
	NvRegTransmitPoll = 0x10c,
#define NVREG_TRANSMITPOLL_MAC_ADDR_REV	0x00008000
	NvRegLinkSpeed = 0x110,
#define NVREG_LINKSPEED_FORCE 0x10000
#define NVREG_LINKSPEED_10	1000
#define NVREG_LINKSPEED_100	100
#define NVREG_LINKSPEED_1000	50
#define NVREG_LINKSPEED_MASK	(0xFFF)
	NvRegUnknownSetupReg5 = 0x130,
#define NVREG_UNKSETUP5_BIT31	(1<<31)
	NvRegTxWatermark = 0x13c,
#define NVREG_TX_WM_DESC1_DEFAULT	0x0200010
#define NVREG_TX_WM_DESC2_3_DEFAULT	0x1e08000
#define NVREG_TX_WM_DESC2_3_1000	0xfe08000
	NvRegTxRxControl = 0x144,
#define NVREG_TXRXCTL_KICK	0x0001
#define NVREG_TXRXCTL_BIT1	0x0002
#define NVREG_TXRXCTL_BIT2	0x0004
#define NVREG_TXRXCTL_IDLE	0x0008
#define NVREG_TXRXCTL_RESET	0x0010
#define NVREG_TXRXCTL_RXCHECK	0x0400
#define NVREG_TXRXCTL_DESC_1	0
#define NVREG_TXRXCTL_DESC_2	0x002100
#define NVREG_TXRXCTL_DESC_3	0xc02200
#define NVREG_TXRXCTL_VLANSTRIP 0x00040
#define NVREG_TXRXCTL_VLANINS	0x00080
	NvRegTxRingPhysAddrHigh = 0x148,
	NvRegRxRingPhysAddrHigh = 0x14C,
	NvRegTxPauseFrame = 0x170,
#define NVREG_TX_PAUSEFRAME_DISABLE	0x0fff0080
#define NVREG_TX_PAUSEFRAME_ENABLE_V1	0x01800010
#define NVREG_TX_PAUSEFRAME_ENABLE_V2	0x056003f0
#define NVREG_TX_PAUSEFRAME_ENABLE_V3	0x09f00880
	NvRegTxPauseFrameLimit = 0x174,
#define NVREG_TX_PAUSEFRAMELIMIT_ENABLE	0x00010000
	NvRegMIIStatus = 0x180,
#define NVREG_MIISTAT_ERROR		0x0001
#define NVREG_MIISTAT_LINKCHANGE	0x0008
#define NVREG_MIISTAT_MASK_RW		0x0007
#define NVREG_MIISTAT_MASK_ALL		0x000f
	NvRegMIIMask = 0x184,
#define NVREG_MII_LINKCHANGE		0x0008

	NvRegAdapterControl = 0x188,
#define NVREG_ADAPTCTL_START	0x02
#define NVREG_ADAPTCTL_LINKUP	0x04
#define NVREG_ADAPTCTL_PHYVALID	0x40000
#define NVREG_ADAPTCTL_RUNNING	0x100000
#define NVREG_ADAPTCTL_PHYSHIFT	24
	NvRegMIISpeed = 0x18c,
#define NVREG_MIISPEED_BIT8	(1<<8)
#define NVREG_MIIDELAY	5
	NvRegMIIControl = 0x190,
#define NVREG_MIICTL_INUSE	0x08000
#define NVREG_MIICTL_WRITE	0x00400
#define NVREG_MIICTL_ADDRSHIFT	5
	NvRegMIIData = 0x194,
	NvRegTxUnicast = 0x1a0,
	NvRegTxMulticast = 0x1a4,
	NvRegTxBroadcast = 0x1a8,
	NvRegWakeUpFlags = 0x200,
#define NVREG_WAKEUPFLAGS_VAL		0x7770
#define NVREG_WAKEUPFLAGS_BUSYSHIFT	24
#define NVREG_WAKEUPFLAGS_ENABLESHIFT	16
#define NVREG_WAKEUPFLAGS_D3SHIFT	12
#define NVREG_WAKEUPFLAGS_D2SHIFT	8
#define NVREG_WAKEUPFLAGS_D1SHIFT	4
#define NVREG_WAKEUPFLAGS_D0SHIFT	0
#define NVREG_WAKEUPFLAGS_ACCEPT_MAGPAT		0x01
#define NVREG_WAKEUPFLAGS_ACCEPT_WAKEUPPAT	0x02
#define NVREG_WAKEUPFLAGS_ACCEPT_LINKCHANGE	0x04
#define NVREG_WAKEUPFLAGS_ENABLE	0x1111

	NvRegMgmtUnitGetVersion = 0x204,
#define NVREG_MGMTUNITGETVERSION	0x01
	NvRegMgmtUnitVersion = 0x208,
#define NVREG_MGMTUNITVERSION		0x08
	NvRegPowerCap = 0x268,
#define NVREG_POWERCAP_D3SUPP	(1<<30)
#define NVREG_POWERCAP_D2SUPP	(1<<26)
#define NVREG_POWERCAP_D1SUPP	(1<<25)
	NvRegPowerState = 0x26c,
#define NVREG_POWERSTATE_POWEREDUP	0x8000
#define NVREG_POWERSTATE_VALID		0x0100
#define NVREG_POWERSTATE_MASK		0x0003
#define NVREG_POWERSTATE_D0		0x0000
#define NVREG_POWERSTATE_D1		0x0001
#define NVREG_POWERSTATE_D2		0x0002
#define NVREG_POWERSTATE_D3		0x0003
	NvRegMgmtUnitControl = 0x278,
#define NVREG_MGMTUNITCONTROL_INUSE	0x20000
	NvRegTxCnt = 0x280,
	NvRegTxZeroReXmt = 0x284,
	NvRegTxOneReXmt = 0x288,
	NvRegTxManyReXmt = 0x28c,
	NvRegTxLateCol = 0x290,
	NvRegTxUnderflow = 0x294,
	NvRegTxLossCarrier = 0x298,
	NvRegTxExcessDef = 0x29c,
	NvRegTxRetryErr = 0x2a0,
	NvRegRxFrameErr = 0x2a4,
	NvRegRxExtraByte = 0x2a8,
	NvRegRxLateCol = 0x2ac,
	NvRegRxRunt = 0x2b0,
	NvRegRxFrameTooLong = 0x2b4,
	NvRegRxOverflow = 0x2b8,
	NvRegRxFCSErr = 0x2bc,
	NvRegRxFrameAlignErr = 0x2c0,
	NvRegRxLenErr = 0x2c4,
	NvRegRxUnicast = 0x2c8,
	NvRegRxMulticast = 0x2cc,
	NvRegRxBroadcast = 0x2d0,
	NvRegTxDef = 0x2d4,
	NvRegTxFrame = 0x2d8,
	NvRegRxCnt = 0x2dc,
	NvRegTxPause = 0x2e0,
	NvRegRxPause = 0x2e4,
	NvRegRxDropFrame = 0x2e8,
	NvRegVlanControl = 0x300,
#define NVREG_VLANCONTROL_ENABLE	0x2000
	NvRegMSIXMap0 = 0x3e0,
	NvRegMSIXMap1 = 0x3e4,
	NvRegMSIXIrqStatus = 0x3f0,

	NvRegPowerState2 = 0x600,
#define NVREG_POWERSTATE2_POWERUP_MASK		0x0F15
#define NVREG_POWERSTATE2_POWERUP_REV_A3	0x0001
#define NVREG_POWERSTATE2_PHY_RESET		0x0004
#define NVREG_POWERSTATE2_GATE_CLOCKS		0x0F00
};

/* Big endian: should work, but is untested */
struct ring_desc {
	__le32 buf;
	__le32 flaglen;
};

struct ring_desc_ex {
	__le32 bufhigh;
	__le32 buflow;
	__le32 txvlan;
	__le32 flaglen;
};

union ring_type {
	struct ring_desc *orig;
	struct ring_desc_ex *ex;
};

#define FLAG_MASK_V1 0xffff0000
#define FLAG_MASK_V2 0xffffc000
#define LEN_MASK_V1 (0xffffffff ^ FLAG_MASK_V1)
#define LEN_MASK_V2 (0xffffffff ^ FLAG_MASK_V2)

#define NV_TX_LASTPACKET	(1<<16)
#define NV_TX_RETRYERROR	(1<<19)
#define NV_TX_RETRYCOUNT_MASK	(0xF<<20)
#define NV_TX_FORCED_INTERRUPT	(1<<24)
#define NV_TX_DEFERRED		(1<<26)
#define NV_TX_CARRIERLOST	(1<<27)
#define NV_TX_LATECOLLISION	(1<<28)
#define NV_TX_UNDERFLOW		(1<<29)
#define NV_TX_ERROR		(1<<30)
#define NV_TX_VALID		(1<<31)

#define NV_TX2_LASTPACKET	(1<<29)
#define NV_TX2_RETRYERROR	(1<<18)
#define NV_TX2_RETRYCOUNT_MASK	(0xF<<19)
#define NV_TX2_FORCED_INTERRUPT	(1<<30)
#define NV_TX2_DEFERRED		(1<<25)
#define NV_TX2_CARRIERLOST	(1<<26)
#define NV_TX2_LATECOLLISION	(1<<27)
#define NV_TX2_UNDERFLOW	(1<<28)
/* error and valid are the same for both */
#define NV_TX2_ERROR		(1<<30)
#define NV_TX2_VALID		(1<<31)
#define NV_TX2_TSO		(1<<28)
#define NV_TX2_TSO_SHIFT	14
#define NV_TX2_TSO_MAX_SHIFT	14
#define NV_TX2_TSO_MAX_SIZE	(1<<NV_TX2_TSO_MAX_SHIFT)
#define NV_TX2_CHECKSUM_L3	(1<<27)
#define NV_TX2_CHECKSUM_L4	(1<<26)

#define NV_TX3_VLAN_TAG_PRESENT (1<<18)

#define NV_RX_DESCRIPTORVALID	(1<<16)
#define NV_RX_MISSEDFRAME	(1<<17)
#define NV_RX_SUBTRACT1		(1<<18)
#define NV_RX_ERROR1		(1<<23)
#define NV_RX_ERROR2		(1<<24)
#define NV_RX_ERROR3		(1<<25)
#define NV_RX_ERROR4		(1<<26)
#define NV_RX_CRCERR		(1<<27)
#define NV_RX_OVERFLOW		(1<<28)
#define NV_RX_FRAMINGERR	(1<<29)
#define NV_RX_ERROR		(1<<30)
#define NV_RX_AVAIL		(1<<31)
#define NV_RX_ERROR_MASK	(NV_RX_ERROR1|NV_RX_ERROR2|NV_RX_ERROR3|NV_RX_ERROR4|NV_RX_CRCERR|NV_RX_OVERFLOW|NV_RX_FRAMINGERR)

#define NV_RX2_CHECKSUMMASK	(0x1C000000)
#define NV_RX2_CHECKSUM_IP	(0x10000000)
#define NV_RX2_CHECKSUM_IP_TCP	(0x14000000)
#define NV_RX2_CHECKSUM_IP_UDP	(0x18000000)
#define NV_RX2_DESCRIPTORVALID	(1<<29)
#define NV_RX2_SUBTRACT1	(1<<25)
#define NV_RX2_ERROR1		(1<<18)
#define NV_RX2_ERROR2		(1<<19)
#define NV_RX2_ERROR3		(1<<20)
#define NV_RX2_ERROR4		(1<<21)
#define NV_RX2_CRCERR		(1<<22)
#define NV_RX2_OVERFLOW		(1<<23)
#define NV_RX2_FRAMINGERR	(1<<24)
/* error and avail are the same for both */
#define NV_RX2_ERROR		(1<<30)
#define NV_RX2_AVAIL		(1<<31)
#define NV_RX2_ERROR_MASK	(NV_RX2_ERROR1|NV_RX2_ERROR2|NV_RX2_ERROR3|NV_RX2_ERROR4|NV_RX2_CRCERR|NV_RX2_OVERFLOW|NV_RX2_FRAMINGERR)

#define NV_RX3_VLAN_TAG_PRESENT (1<<16)
#define NV_RX3_VLAN_TAG_MASK	(0x0000FFFF)

/* Miscellaneous hardware related defines: */
#define NV_PCI_REGSZ_VER1	0x270
#define NV_PCI_REGSZ_VER2	0x2d4
#define NV_PCI_REGSZ_VER3	0x604
#define NV_PCI_REGSZ_MAX	0x604

/* various timeout delays: all in usec */
#define NV_TXRX_RESET_DELAY	4
#define NV_TXSTOP_DELAY1	10
#define NV_TXSTOP_DELAY1MAX	500000
#define NV_TXSTOP_DELAY2	100
#define NV_RXSTOP_DELAY1	10
#define NV_RXSTOP_DELAY1MAX	500000
#define NV_RXSTOP_DELAY2	100
#define NV_SETUP5_DELAY		5
#define NV_SETUP5_DELAYMAX	50000
#define NV_POWERUP_DELAY	5
#define NV_POWERUP_DELAYMAX	5000
#define NV_MIIBUSY_DELAY	50
#define NV_MIIPHY_DELAY	10
#define NV_MIIPHY_DELAYMAX	10000
#define NV_MAC_RESET_DELAY	64

#define NV_WAKEUPPATTERNS	5
#define NV_WAKEUPMASKENTRIES	4

/* General driver defaults */
#define NV_WATCHDOG_TIMEO	(5*HZ)

#define RX_RING_DEFAULT		512
#define TX_RING_DEFAULT		256
#define RX_RING_MIN		128
#define TX_RING_MIN		64
#define RING_MAX_DESC_VER_1	1024
#define RING_MAX_DESC_VER_2_3	16384

/* rx/tx mac addr + type + vlan + align + slack*/
#define NV_RX_HEADERS		(64)
/* even more slack. */
#define NV_RX_ALLOC_PAD		(64)

/* maximum mtu size */
#define NV_PKTLIMIT_1	ETH_DATA_LEN	/* hard limit not known */
#define NV_PKTLIMIT_2	9100	/* Actual limit according to NVidia: 9202 */

#define OOM_REFILL	(1+HZ/20)
#define POLL_WAIT	(1+HZ/100)
#define LINK_TIMEOUT	(3*HZ)
#define STATS_INTERVAL	(10*HZ)

/*
 * desc_ver values:
 * The nic supports three different descriptor types:
 * - DESC_VER_1: Original
 * - DESC_VER_2: support for jumbo frames.
 * - DESC_VER_3: 64-bit format.
 */
#define DESC_VER_1	1
#define DESC_VER_2	2
#define DESC_VER_3	3

/* PHY defines */
#define PHY_OUI_MARVELL		0x5043
#define PHY_OUI_CICADA		0x03f1
#define PHY_OUI_VITESSE		0x01c1
#define PHY_OUI_REALTEK		0x0732
#define PHY_OUI_REALTEK2	0x0020
#define PHYID1_OUI_MASK	0x03ff
#define PHYID1_OUI_SHFT	6
#define PHYID2_OUI_MASK	0xfc00
#define PHYID2_OUI_SHFT	10
#define PHYID2_MODEL_MASK		0x03f0
#define PHY_MODEL_REALTEK_8211		0x0110
#define PHY_REV_MASK			0x0001
#define PHY_REV_REALTEK_8211B		0x0000
#define PHY_REV_REALTEK_8211C		0x0001
#define PHY_MODEL_REALTEK_8201		0x0200
#define PHY_MODEL_MARVELL_E3016		0x0220
#define PHY_MARVELL_E3016_INITMASK	0x0300
#define PHY_CICADA_INIT1	0x0f000
#define PHY_CICADA_INIT2	0x0e00
#define PHY_CICADA_INIT3	0x01000
#define PHY_CICADA_INIT4	0x0200
#define PHY_CICADA_INIT5	0x0004
#define PHY_CICADA_INIT6	0x02000
#define PHY_VITESSE_INIT_REG1	0x1f
#define PHY_VITESSE_INIT_REG2	0x10
#define PHY_VITESSE_INIT_REG3	0x11
#define PHY_VITESSE_INIT_REG4	0x12
#define PHY_VITESSE_INIT_MSK1	0xc
#define PHY_VITESSE_INIT_MSK2	0x0180
#define PHY_VITESSE_INIT1	0x52b5
#define PHY_VITESSE_INIT2	0xaf8a
#define PHY_VITESSE_INIT3	0x8
#define PHY_VITESSE_INIT4	0x8f8a
#define PHY_VITESSE_INIT5	0xaf86
#define PHY_VITESSE_INIT6	0x8f86
#define PHY_VITESSE_INIT7	0xaf82
#define PHY_VITESSE_INIT8	0x0100
#define PHY_VITESSE_INIT9	0x8f82
#define PHY_VITESSE_INIT10	0x0
#define PHY_REALTEK_INIT_REG1	0x1f
#define PHY_REALTEK_INIT_REG2	0x19
#define PHY_REALTEK_INIT_REG3	0x13
#define PHY_REALTEK_INIT_REG4	0x14
#define PHY_REALTEK_INIT_REG5	0x18
#define PHY_REALTEK_INIT_REG6	0x11
#define PHY_REALTEK_INIT_REG7	0x01
#define PHY_REALTEK_INIT1	0x0000
#define PHY_REALTEK_INIT2	0x8e00
#define PHY_REALTEK_INIT3	0x0001
#define PHY_REALTEK_INIT4	0xad17
#define PHY_REALTEK_INIT5	0xfb54
#define PHY_REALTEK_INIT6	0xf5c7
#define PHY_REALTEK_INIT7	0x1000
#define PHY_REALTEK_INIT8	0x0003
#define PHY_REALTEK_INIT9	0x0008
#define PHY_REALTEK_INIT10	0x0005
#define PHY_REALTEK_INIT11	0x0200
#define PHY_REALTEK_INIT_MSK1	0x0003

#define PHY_GIGABIT	0x0100

#define PHY_TIMEOUT	0x1
#define PHY_ERROR	0x2

#define PHY_100	0x1
#define PHY_1000	0x2
#define PHY_HALF	0x100

#define NV_PAUSEFRAME_RX_CAPABLE 0x0001
#define NV_PAUSEFRAME_TX_CAPABLE 0x0002
#define NV_PAUSEFRAME_RX_ENABLE  0x0004
#define NV_PAUSEFRAME_TX_ENABLE  0x0008
#define NV_PAUSEFRAME_RX_REQ     0x0010
#define NV_PAUSEFRAME_TX_REQ     0x0020
#define NV_PAUSEFRAME_AUTONEG    0x0040

/* MSI/MSI-X defines */
#define NV_MSI_X_MAX_VECTORS  8
#define NV_MSI_X_VECTORS_MASK 0x000f
#define NV_MSI_CAPABLE        0x0010
#define NV_MSI_X_CAPABLE      0x0020
#define NV_MSI_ENABLED        0x0040
#define NV_MSI_X_ENABLED      0x0080

#define NV_MSI_X_VECTOR_ALL   0x0
#define NV_MSI_X_VECTOR_RX    0x0
#define NV_MSI_X_VECTOR_TX    0x1
#define NV_MSI_X_VECTOR_OTHER 0x2

#define NV_MSI_PRIV_OFFSET 0x68
#define NV_MSI_PRIV_VALUE  0xffffffff

#define NV_RESTART_TX         0x1
#define NV_RESTART_RX         0x2

#define NV_TX_LIMIT_COUNT     16

#define NV_DYNAMIC_THRESHOLD        4
#define NV_DYNAMIC_MAX_QUIET_COUNT  2048

/* statistics */
struct nv_ethtool_str {
	char name[ETH_GSTRING_LEN];
};

static const struct nv_ethtool_str nv_estats_str[] = {
	{ "tx_bytes" }, /* includes Ethernet FCS CRC */
	{ "tx_zero_rexmt" },
	{ "tx_one_rexmt" },
	{ "tx_many_rexmt" },
	{ "tx_late_collision" },
	{ "tx_fifo_errors" },
	{ "tx_carrier_errors" },
	{ "tx_excess_deferral" },
	{ "tx_retry_error" },
	{ "rx_frame_error" },
	{ "rx_extra_byte" },
	{ "rx_late_collision" },
	{ "rx_runt" },
	{ "rx_frame_too_long" },
	{ "rx_over_errors" },
	{ "rx_crc_errors" },
	{ "rx_frame_align_error" },
	{ "rx_length_error" },
	{ "rx_unicast" },
	{ "rx_multicast" },
	{ "rx_broadcast" },
	{ "rx_packets" },
	{ "rx_errors_total" },
	{ "tx_errors_total" },

	/* version 2 stats */
	{ "tx_deferral" },
	{ "tx_packets" },
	{ "rx_bytes" }, /* includes Ethernet FCS CRC */
	{ "tx_pause" },
	{ "rx_pause" },
	{ "rx_drop_frame" },

	/* version 3 stats */
	{ "tx_unicast" },
	{ "tx_multicast" },
	{ "tx_broadcast" }
};

struct nv_ethtool_stats {
	u64 tx_bytes; /* should be ifconfig->tx_bytes + 4*tx_packets */
	u64 tx_zero_rexmt;
	u64 tx_one_rexmt;
	u64 tx_many_rexmt;
	u64 tx_late_collision;
	u64 tx_fifo_errors;
	u64 tx_carrier_errors;
	u64 tx_excess_deferral;
	u64 tx_retry_error;
	u64 rx_frame_error;
	u64 rx_extra_byte;
	u64 rx_late_collision;
	u64 rx_runt;
	u64 rx_frame_too_long;
	u64 rx_over_errors;
	u64 rx_crc_errors;
	u64 rx_frame_align_error;
	u64 rx_length_error;
	u64 rx_unicast;
	u64 rx_multicast;
	u64 rx_broadcast;
	u64 rx_packets; /* should be ifconfig->rx_packets */
	u64 rx_errors_total;
	u64 tx_errors_total;

	/* version 2 stats */
	u64 tx_deferral;
	u64 tx_packets; /* should be ifconfig->tx_packets */
	u64 rx_bytes;   /* should be ifconfig->rx_bytes + 4*rx_packets */
	u64 tx_pause;
	u64 rx_pause;
	u64 rx_drop_frame;

	/* version 3 stats */
	u64 tx_unicast;
	u64 tx_multicast;
	u64 tx_broadcast;
};

#define NV_DEV_STATISTICS_V3_COUNT (sizeof(struct nv_ethtool_stats)/sizeof(u64))
#define NV_DEV_STATISTICS_V2_COUNT (NV_DEV_STATISTICS_V3_COUNT - 3)
#define NV_DEV_STATISTICS_V1_COUNT (NV_DEV_STATISTICS_V2_COUNT - 6)

/* diagnostics */
#define NV_TEST_COUNT_BASE 3
#define NV_TEST_COUNT_EXTENDED 4

static const struct nv_ethtool_str nv_etests_str[] = {
	{ "link      (online/offline)" },
	{ "register  (offline)       " },
	{ "interrupt (offline)       " },
	{ "loopback  (offline)       " }
};

struct register_test {
	__u32 reg;
	__u32 mask;
};

static const struct register_test nv_registers_test[] = {
	{ NvRegUnknownSetupReg6, 0x01 },
	{ NvRegMisc1, 0x03c },
	{ NvRegOffloadConfig, 0x03ff },
	{ NvRegMulticastAddrA, 0xffffffff },
	{ NvRegTxWatermark, 0x0ff },
	{ NvRegWakeUpFlags, 0x07777 },
	{ 0, 0 }
};

struct nv_skb_map {
	struct sk_buff *skb;
	dma_addr_t dma;
	unsigned int dma_len:31;
	unsigned int dma_single:1;
	struct ring_desc_ex *first_tx_desc;
	struct nv_skb_map *next_tx_ctx;
};

/*
 * SMP locking:
 * All hardware access under netdev_priv(dev)->lock, except the performance
 * critical parts:
 * - rx is (pseudo-) lockless: it relies on the single-threading provided
 *	by the arch code for interrupts.
 * - tx setup is lockless: it relies on netif_tx_lock. Actual submission
 *	needs netdev_priv(dev)->lock :-(
 * - set_multicast_list: preparation lockless, relies on netif_tx_lock.
 *
 * Hardware stats updates are protected by hwstats_lock:
 * - updated by nv_do_stats_poll (timer). This is meant to avoid
 *   integer wraparound in the NIC stats registers, at low frequency
 *   (0.1 Hz)
 * - updated by nv_get_ethtool_stats + nv_get_stats64
 *
 * Software stats are accessed only through 64b synchronization points
 * and are not subject to other synchronization techniques (single
 * update thread on the TX or RX paths).
 */

/* in dev: base, irq */
struct fe_priv {
	spinlock_t lock;

	struct net_device *dev;
	struct napi_struct napi;

	/* hardware stats are updated in syscall and timer */
	spinlock_t hwstats_lock;
	struct nv_ethtool_stats estats;

	int in_shutdown;
	u32 linkspeed;
	int duplex;
	int autoneg;
	int fixed_mode;
	int phyaddr;
	int wolenabled;
	unsigned int phy_oui;
	unsigned int phy_model;
	unsigned int phy_rev;
	u16 gigabit;
	int intr_test;
	int recover_error;
	int quiet_count;

	/* General data: RO fields */
	dma_addr_t ring_addr;
	struct pci_dev *pci_dev;
	u32 orig_mac[2];
	u32 events;
	u32 irqmask;
	u32 desc_ver;
	u32 txrxctl_bits;
	u32 vlanctl_bits;
	u32 driver_data;
	u32 device_id;
	u32 register_size;
	u32 mac_in_use;
	int mgmt_version;
	int mgmt_sema;

	void __iomem *base;

	/* rx specific fields.
	 * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
	 */
	union ring_type get_rx, put_rx, first_rx, last_rx;
	struct nv_skb_map *get_rx_ctx, *put_rx_ctx;
	struct nv_skb_map *first_rx_ctx, *last_rx_ctx;
	struct nv_skb_map *rx_skb;

	union ring_type rx_ring;
	unsigned int rx_buf_sz;
	unsigned int pkt_limit;
	struct timer_list oom_kick;
	struct timer_list nic_poll;
	struct timer_list stats_poll;
	u32 nic_poll_irq;
	int rx_ring_size;

	/* RX software stats */
	struct u64_stats_sync swstats_rx_syncp;
	u64 stat_rx_packets;
	u64 stat_rx_bytes; /* not always available in HW */
	u64 stat_rx_missed_errors;
	u64 stat_rx_dropped;

	/* media detection workaround.
	 * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
	 */
	int need_linktimer;
	unsigned long link_timeout;
	/*
	 * tx specific fields.
	 */
	union ring_type get_tx, put_tx, first_tx, last_tx;
	struct nv_skb_map *get_tx_ctx, *put_tx_ctx;
	struct nv_skb_map *first_tx_ctx, *last_tx_ctx;
	struct nv_skb_map *tx_skb;

	union ring_type tx_ring;
	u32 tx_flags;
	int tx_ring_size;
	int tx_limit;
	u32 tx_pkts_in_progress;
	struct nv_skb_map *tx_change_owner;
	struct nv_skb_map *tx_end_flip;
	int tx_stop;

	/* TX software stats */
	struct u64_stats_sync swstats_tx_syncp;
	u64 stat_tx_packets; /* not always available in HW */
	u64 stat_tx_bytes;
	u64 stat_tx_dropped;

	/* msi/msi-x fields */
	u32 msi_flags;
	struct msix_entry msi_x_entry[NV_MSI_X_MAX_VECTORS];

	/* flow control */
	u32 pause_flags;

	/* power saved state */
	u32 saved_config_space[NV_PCI_REGSZ_MAX/4];

	/* for different msi-x irq type */
	char name_rx[IFNAMSIZ + 3];       /* -rx    */
	char name_tx[IFNAMSIZ + 3];       /* -tx    */
	char name_other[IFNAMSIZ + 6];    /* -other */
};

/*
 * Maximum number of loops until we assume that a bit in the irq mask
 * is stuck. Overridable with module param.
 */
static int max_interrupt_work = 4;

/*
 * Optimization can be either throuput mode or cpu mode
 *
 * Throughput Mode: Every tx and rx packet will generate an interrupt.
 * CPU Mode: Interrupts are controlled by a timer.
 */
enum {
	NV_OPTIMIZATION_MODE_THROUGHPUT,
	NV_OPTIMIZATION_MODE_CPU,
	NV_OPTIMIZATION_MODE_DYNAMIC
};
static int optimization_mode = NV_OPTIMIZATION_MODE_DYNAMIC;

/*
 * Poll interval for timer irq
 *
 * This interval determines how frequent an interrupt is generated.
 * The is value is determined by [(time_in_micro_secs * 100) / (2^10)]
 * Min = 0, and Max = 65535
 */
static int poll_interval = -1;

/*
 * MSI interrupts
 */
enum {
	NV_MSI_INT_DISABLED,
	NV_MSI_INT_ENABLED
};
static int msi = NV_MSI_INT_ENABLED;

/*
 * MSIX interrupts
 */
enum {
	NV_MSIX_INT_DISABLED,
	NV_MSIX_INT_ENABLED
};
static int msix = NV_MSIX_INT_ENABLED;

/*
 * DMA 64bit
 */
enum {
	NV_DMA_64BIT_DISABLED,
	NV_DMA_64BIT_ENABLED
};
static int dma_64bit = NV_DMA_64BIT_ENABLED;

/*
 * Debug output control for tx_timeout
 */
static bool debug_tx_timeout = false;

/*
 * Crossover Detection
 * Realtek 8201 phy + some OEM boards do not work properly.
 */
enum {
	NV_CROSSOVER_DETECTION_DISABLED,
	NV_CROSSOVER_DETECTION_ENABLED
};
static int phy_cross = NV_CROSSOVER_DETECTION_DISABLED;

/*
 * Power down phy when interface is down (persists through reboot;
 * older Linux and other OSes may not power it up again)
 */
static int phy_power_down;

static inline struct fe_priv *get_nvpriv(struct net_device *dev)
{
	return netdev_priv(dev);
}

static inline u8 __iomem *get_hwbase(struct net_device *dev)
{
	return ((struct fe_priv *)netdev_priv(dev))->base;
}

static inline void pci_push(u8 __iomem *base)
{
	/* force out pending posted writes */
	readl(base);
}

static inline u32 nv_descr_getlength(struct ring_desc *prd, u32 v)
{
	return le32_to_cpu(prd->flaglen)
		& ((v == DESC_VER_1) ? LEN_MASK_V1 : LEN_MASK_V2);
}

static inline u32 nv_descr_getlength_ex(struct ring_desc_ex *prd, u32 v)
{
	return le32_to_cpu(prd->flaglen) & LEN_MASK_V2;
}

static bool nv_optimized(struct fe_priv *np)
{
	if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
		return false;
	return true;
}

static int reg_delay(struct net_device *dev, int offset, u32 mask, u32 target,
		     int delay, int delaymax)
{
	u8 __iomem *base = get_hwbase(dev);

	pci_push(base);
	do {
		udelay(delay);
		delaymax -= delay;
		if (delaymax < 0)
			return 1;
	} while ((readl(base + offset) & mask) != target);
	return 0;
}

#define NV_SETUP_RX_RING 0x01
#define NV_SETUP_TX_RING 0x02

static inline u32 dma_low(dma_addr_t addr)
{
	return addr;
}

static inline u32 dma_high(dma_addr_t addr)
{
	return addr>>31>>1;	/* 0 if 32bit, shift down by 32 if 64bit */
}

static void setup_hw_rings(struct net_device *dev, int rxtx_flags)
{
	struct fe_priv *np = get_nvpriv(dev);
	u8 __iomem *base = get_hwbase(dev);

	if (!nv_optimized(np)) {
		if (rxtx_flags & NV_SETUP_RX_RING)
			writel(dma_low(np->ring_addr), base + NvRegRxRingPhysAddr);
		if (rxtx_flags & NV_SETUP_TX_RING)
			writel(dma_low(np->ring_addr + np->rx_ring_size*sizeof(struct ring_desc)), base + NvRegTxRingPhysAddr);
	} else {
		if (rxtx_flags & NV_SETUP_RX_RING) {
			writel(dma_low(np->ring_addr), base + NvRegRxRingPhysAddr);
			writel(dma_high(np->ring_addr), base + NvRegRxRingPhysAddrHigh);
		}
		if (rxtx_flags & NV_SETUP_TX_RING) {
			writel(dma_low(np->ring_addr + np->rx_ring_size*sizeof(struct ring_desc_ex)), base + NvRegTxRingPhysAddr);
			writel(dma_high(np->ring_addr + np->rx_ring_size*sizeof(struct ring_desc_ex)), base + NvRegTxRingPhysAddrHigh);
		}
	}
}

static void free_rings(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	if (!nv_optimized(np)) {
		if (np->rx_ring.orig)
			pci_free_consistent(np->pci_dev, sizeof(struct ring_desc) * (np->rx_ring_size + np->tx_ring_size),
					    np->rx_ring.orig, np->ring_addr);
	} else {
		if (np->rx_ring.ex)
			pci_free_consistent(np->pci_dev, sizeof(struct ring_desc_ex) * (np->rx_ring_size + np->tx_ring_size),
					    np->rx_ring.ex, np->ring_addr);
	}
	kfree(np->rx_skb);
	kfree(np->tx_skb);
}

static int using_multi_irqs(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	if (!(np->msi_flags & NV_MSI_X_ENABLED) ||
	    ((np->msi_flags & NV_MSI_X_ENABLED) &&
	     ((np->msi_flags & NV_MSI_X_VECTORS_MASK) == 0x1)))
		return 0;
	else
		return 1;
}

static void nv_txrx_gate(struct net_device *dev, bool gate)
{
	struct fe_priv *np = get_nvpriv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 powerstate;

	if (!np->mac_in_use &&
	    (np->driver_data & DEV_HAS_POWER_CNTRL)) {
		powerstate = readl(base + NvRegPowerState2);
		if (gate)
			powerstate |= NVREG_POWERSTATE2_GATE_CLOCKS;
		else
			powerstate &= ~NVREG_POWERSTATE2_GATE_CLOCKS;
		writel(powerstate, base + NvRegPowerState2);
	}
}

static void nv_enable_irq(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	if (!using_multi_irqs(dev)) {
		if (np->msi_flags & NV_MSI_X_ENABLED)
			enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
		else
			enable_irq(np->pci_dev->irq);
	} else {
		enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
		enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
		enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_OTHER].vector);
	}
}

static void nv_disable_irq(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	if (!using_multi_irqs(dev)) {
		if (np->msi_flags & NV_MSI_X_ENABLED)
			disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
		else
			disable_irq(np->pci_dev->irq);
	} else {
		disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
		disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
		disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_OTHER].vector);
	}
}

/* In MSIX mode, a write to irqmask behaves as XOR */
static void nv_enable_hw_interrupts(struct net_device *dev, u32 mask)
{
	u8 __iomem *base = get_hwbase(dev);

	writel(mask, base + NvRegIrqMask);
}

static void nv_disable_hw_interrupts(struct net_device *dev, u32 mask)
{
	struct fe_priv *np = get_nvpriv(dev);
	u8 __iomem *base = get_hwbase(dev);

	if (np->msi_flags & NV_MSI_X_ENABLED) {
		writel(mask, base + NvRegIrqMask);
	} else {
		if (np->msi_flags & NV_MSI_ENABLED)
			writel(0, base + NvRegMSIIrqMask);
		writel(0, base + NvRegIrqMask);
	}
}

static void nv_napi_enable(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	napi_enable(&np->napi);
}

static void nv_napi_disable(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);

	napi_disable(&np->napi);
}

#define MII_READ	(-1)
/* mii_rw: read/write a register on the PHY.
 *
 * Caller must guarantee serialization
 */
static int mii_rw(struct net_device *dev, int addr, int miireg, int value)
{
	u8 __iomem *base = get_hwbase(dev);
	u32 reg;
	int retval;

	writel(NVREG_MIISTAT_MASK_RW, base + NvRegMIIStatus);

	reg = readl(base + NvRegMIIControl);
	if (reg & NVREG_MIICTL_INUSE) {
		writel(NVREG_MIICTL_INUSE, base + NvRegMIIControl);
		udelay(NV_MIIBUSY_DELAY);
	}

	reg = (addr << NVREG_MIICTL_ADDRSHIFT) | miireg;
	if (value != MII_READ) {
		writel(value, base + NvRegMIIData);
		reg |= NVREG_MIICTL_WRITE;
	}
	writel(reg, base + NvRegMIIControl);

	if (reg_delay(dev, NvRegMIIControl, NVREG_MIICTL_INUSE, 0,
			NV_MIIPHY_DELAY, NV_MIIPHY_DELAYMAX)) {
		retval = -1;
	} else if (value != MII_READ) {
		/* it was a write operation - fewer failures are detectable */
		retval = 0;
	} else if (readl(base + NvRegMIIStatus) & NVREG_MIISTAT_ERROR) {
		retval = -1;
	} else {
		retval = readl(base + NvRegMIIData);
	}

	return retval;
}

static int phy_reset(struct net_device *dev, u32 bmcr_setup)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 miicontrol;
	unsigned int tries = 0;

	miicontrol = BMCR_RESET | bmcr_setup;
	if (mii_rw(dev, np->phyaddr, MII_BMCR, miicontrol))
		return -1;

	/* wait for 500ms */
	msleep(500);

	/* must wait till reset is deasserted */
	while (miicontrol & BMCR_RESET) {
		usleep_range(10000, 20000);
		miicontrol = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
		/* FIXME: 100 tries seem excessive */
		if (tries++ > 100)
			return -1;
	}
	return 0;
}

static int init_realtek_8211b(struct net_device *dev, struct fe_priv *np)
{
	static const struct {
		int reg;
		int init;
	} ri[] = {
		{ PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT1 },
		{ PHY_REALTEK_INIT_REG2, PHY_REALTEK_INIT2 },
		{ PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT3 },
		{ PHY_REALTEK_INIT_REG3, PHY_REALTEK_INIT4 },
		{ PHY_REALTEK_INIT_REG4, PHY_REALTEK_INIT5 },
		{ PHY_REALTEK_INIT_REG5, PHY_REALTEK_INIT6 },
		{ PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT1 },
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(ri); i++) {
		if (mii_rw(dev, np->phyaddr, ri[i].reg, ri[i].init))
			return PHY_ERROR;
	}

	return 0;
}

static int init_realtek_8211c(struct net_device *dev, struct fe_priv *np)
{
	u32 reg;
	u8 __iomem *base = get_hwbase(dev);
	u32 powerstate = readl(base + NvRegPowerState2);

	/* need to perform hw phy reset */
	powerstate |= NVREG_POWERSTATE2_PHY_RESET;
	writel(powerstate, base + NvRegPowerState2);
	msleep(25);

	powerstate &= ~NVREG_POWERSTATE2_PHY_RESET;
	writel(powerstate, base + NvRegPowerState2);
	msleep(25);

	reg = mii_rw(dev, np->phyaddr, PHY_REALTEK_INIT_REG6, MII_READ);
	reg |= PHY_REALTEK_INIT9;
	if (mii_rw(dev, np->phyaddr, PHY_REALTEK_INIT_REG6, reg))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT10))
		return PHY_ERROR;
	reg = mii_rw(dev, np->phyaddr, PHY_REALTEK_INIT_REG7, MII_READ);
	if (!(reg & PHY_REALTEK_INIT11)) {
		reg |= PHY_REALTEK_INIT11;
		if (mii_rw(dev, np->phyaddr, PHY_REALTEK_INIT_REG7, reg))
			return PHY_ERROR;
	}
	if (mii_rw(dev, np->phyaddr,
		   PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT1))
		return PHY_ERROR;

	return 0;
}

static int init_realtek_8201(struct net_device *dev, struct fe_priv *np)
{
	u32 phy_reserved;

	if (np->driver_data & DEV_NEED_PHY_INIT_FIX) {
		phy_reserved = mii_rw(dev, np->phyaddr,
				      PHY_REALTEK_INIT_REG6, MII_READ);
		phy_reserved |= PHY_REALTEK_INIT7;
		if (mii_rw(dev, np->phyaddr,
			   PHY_REALTEK_INIT_REG6, phy_reserved))
			return PHY_ERROR;
	}

	return 0;
}

static int init_realtek_8201_cross(struct net_device *dev, struct fe_priv *np)
{
	u32 phy_reserved;

	if (phy_cross == NV_CROSSOVER_DETECTION_DISABLED) {
		if (mii_rw(dev, np->phyaddr,
			   PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT3))
			return PHY_ERROR;
		phy_reserved = mii_rw(dev, np->phyaddr,
				      PHY_REALTEK_INIT_REG2, MII_READ);
		phy_reserved &= ~PHY_REALTEK_INIT_MSK1;
		phy_reserved |= PHY_REALTEK_INIT3;
		if (mii_rw(dev, np->phyaddr,
			   PHY_REALTEK_INIT_REG2, phy_reserved))
			return PHY_ERROR;
		if (mii_rw(dev, np->phyaddr,
			   PHY_REALTEK_INIT_REG1, PHY_REALTEK_INIT1))
			return PHY_ERROR;
	}

	return 0;
}

static int init_cicada(struct net_device *dev, struct fe_priv *np,
		       u32 phyinterface)
{
	u32 phy_reserved;

	if (phyinterface & PHY_RGMII) {
		phy_reserved = mii_rw(dev, np->phyaddr, MII_RESV1, MII_READ);
		phy_reserved &= ~(PHY_CICADA_INIT1 | PHY_CICADA_INIT2);
		phy_reserved |= (PHY_CICADA_INIT3 | PHY_CICADA_INIT4);
		if (mii_rw(dev, np->phyaddr, MII_RESV1, phy_reserved))
			return PHY_ERROR;
		phy_reserved = mii_rw(dev, np->phyaddr, MII_NCONFIG, MII_READ);
		phy_reserved |= PHY_CICADA_INIT5;
		if (mii_rw(dev, np->phyaddr, MII_NCONFIG, phy_reserved))
			return PHY_ERROR;
	}
	phy_reserved = mii_rw(dev, np->phyaddr, MII_SREVISION, MII_READ);
	phy_reserved |= PHY_CICADA_INIT6;
	if (mii_rw(dev, np->phyaddr, MII_SREVISION, phy_reserved))
		return PHY_ERROR;

	return 0;
}

static int init_vitesse(struct net_device *dev, struct fe_priv *np)
{
	u32 phy_reserved;

	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG1, PHY_VITESSE_INIT1))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT2))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG4, MII_READ);
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG4, phy_reserved))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG3, MII_READ);
	phy_reserved &= ~PHY_VITESSE_INIT_MSK1;
	phy_reserved |= PHY_VITESSE_INIT3;
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG3, phy_reserved))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT4))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT5))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG4, MII_READ);
	phy_reserved &= ~PHY_VITESSE_INIT_MSK1;
	phy_reserved |= PHY_VITESSE_INIT3;
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG4, phy_reserved))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG3, MII_READ);
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG3, phy_reserved))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT6))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT7))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG4, MII_READ);
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG4, phy_reserved))
		return PHY_ERROR;
	phy_reserved = mii_rw(dev, np->phyaddr,
			      PHY_VITESSE_INIT_REG3, MII_READ);
	phy_reserved &= ~PHY_VITESSE_INIT_MSK2;
	phy_reserved |= PHY_VITESSE_INIT8;
	if (mii_rw(dev, np->phyaddr, PHY_VITESSE_INIT_REG3, phy_reserved))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG2, PHY_VITESSE_INIT9))
		return PHY_ERROR;
	if (mii_rw(dev, np->phyaddr,
		   PHY_VITESSE_INIT_REG1, PHY_VITESSE_INIT10))
		return PHY_ERROR;

	return 0;
}

static int phy_init(struct net_device *dev)
{
	struct fe_priv *np = get_nvpriv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 phyinterface;
	u32 mii_status, mii_control, mii_control_1000, reg;

	/* phy errata for E3016 phy */
	if (np->phy_model == PHY_MODEL_MARVELL_E3016) {
		reg = mii_rw(dev, np->phyaddr, MII_NCONFIG, MII_READ);
		reg &= ~PHY_MARVELL_E3016_INITMASK;
		if (mii_rw(dev, np->phyaddr, MII_NCONFIG, reg)) {
			netdev_info(dev, "%s: phy write to errata reg failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	}
	if (np->phy_oui == PHY_OUI_REALTEK) {
		if (np->phy_model == PHY_MODEL_REALTEK_8211 &&
		    np->phy_rev == PHY_REV_REALTEK_8211B) {
			if (init_realtek_8211b(dev, np)) {
				netdev_info(dev, "%s: phy init failed\n",
					    pci_name(np->pci_dev));
				return PHY_ERROR;
			}
		} else if (np->phy_model == PHY_MODEL_REALTEK_8211 &&
			   np->phy_rev == PHY_REV_REALTEK_8211C) {
			if (init_realtek_8211c(dev, np)) {
				netdev_info(dev, "%s: phy init failed\n",
					    pci_name(np->pci_dev));
				return PHY_ERROR;
			}
		} else if (np->phy_model == PHY_MODEL_REALTEK_8201) {
			if (init_realtek_8201(dev, np)) {
				netdev_info(dev, "%s: phy init failed\n",
					    pci_name(np->pci_dev));
				return PHY_ERROR;
			}
		}
	}

	/* set advertise register */
	reg = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
	reg |= (ADVERTISE_10HALF | ADVERTISE_10FULL |
		ADVERTISE_100HALF | ADVERTISE_100FULL |
		ADVERTISE_PAUSE_ASYM | ADVERTISE_PAUSE_CAP);
	if (mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg)) {
		netdev_info(dev, "%s: phy write to advertise failed\n",
			    pci_name(np->pci_dev));
		return PHY_ERROR;
	}

	/* get phy interface type */
	phyinterface = readl(base + NvRegPhyInterface);

	/* see if gigabit phy */
	mii_status = mii_rw(dev, np->phyaddr, MII_BMSR, MII_READ);
	if (mii_status & PHY_GIGABIT) {
		np->gigabit = PHY_GIGABIT;
		mii_control_1000 = mii_rw(dev, np->phyaddr,
					  MII_CTRL1000, MII_READ);
		mii_control_1000 &= ~ADVERTISE_1000HALF;
		if (phyinterface & PHY_RGMII)
			mii_control_1000 |= ADVERTISE_1000FULL;
		else
			mii_control_1000 &= ~ADVERTISE_1000FULL;

		if (mii_rw(dev, np->phyaddr, MII_CTRL1000, mii_control_1000)) {
			netdev_info(dev, "%s: phy init failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	} else
		np->gigabit = 0;

	mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
	mii_control |= BMCR_ANENABLE;

	if (np->phy_oui == PHY_OUI_REALTEK &&
	    np->phy_model == PHY_MODEL_REALTEK_8211 &&
	    np->phy_rev == PHY_REV_REALTEK_8211C) {
		/* start autoneg since we already performed hw reset above */
		mii_control |= BMCR_ANRESTART;
		if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control)) {
			netdev_info(dev, "%s: phy init failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	} else {
		/* reset the phy
		 * (certain phys need bmcr to be setup with reset)
		 */
		if (phy_reset(dev, mii_control)) {
			netdev_info(dev, "%s: phy reset failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	}

	/* phy vendor specific configuration */
	if (np->phy_oui == PHY_OUI_CICADA) {
		if (init_cicada(dev, np, phyinterface)) {
			netdev_info(dev, "%s: phy init failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	} else if (np->phy_oui == PHY_OUI_VITESSE) {
		if (init_vitesse(dev, np)) {
			netdev_info(dev, "%s: phy init failed\n",
				    pci_name(np->pci_dev));
			return PHY_ERROR;
		}
	} else if (np->phy_oui == PHY_OUI_REALTEK) {
		if (np->phy_model == PHY_MODEL_REALTEK_8211 &&
		    np->phy_rev == PHY_REV_REALTEK_8211B) {
			/* reset could have cleared these out, set them back */
			if (init_realtek_8211b(dev, np)) {
				netdev_info(dev, "%s: phy init failed\n",
					    pci_name(np->pci_dev));
				return PHY_ERROR;
			}
		} else if (np->phy_model == PHY_MODEL_REALTEK_8201) {
			if (init_realtek_8201(dev, np) ||
			    init_realtek_8201_cross(dev, np)) {
				netdev_info(dev, "%s: phy init failed\n",
					    pci_name(np->pci_dev));
				return PHY_ERROR;
			}
		}
	}

	/* some phys clear out pause advertisement on reset, set it back */
	mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg);

	/* restart auto negotiation, power down phy */
	mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
	mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE);
	if (phy_power_down)
		mii_control |= BMCR_PDOWN;
	if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control))
		return PHY_ERROR;

	return 0;
}

static void nv_start_rx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 rx_ctrl = readl(base + NvRegReceiverControl);

	/* Already running? Stop it. */
	if ((readl(base + NvRegReceiverControl) & NVREG_RCVCTL_START) && !np->mac_in_use) {
		rx_ctrl &= ~NVREG_RCVCTL_START;
		writel(rx_ctrl, base + NvRegReceiverControl);
		pci_push(base);
	}
	writel(np->linkspeed, base + NvRegLinkSpeed);
	pci_push(base);
	rx_ctrl |= NVREG_RCVCTL_START;
	if (np->mac_in_use)
		rx_ctrl &= ~NVREG_RCVCTL_RX_PATH_EN;
	writel(rx_ctrl, base + NvRegReceiverControl);
	pci_push(base);
}

static void nv_stop_rx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 rx_ctrl = readl(base + NvRegReceiverControl);

	if (!np->mac_in_use)
		rx_ctrl &= ~NVREG_RCVCTL_START;
	else
		rx_ctrl |= NVREG_RCVCTL_RX_PATH_EN;
	writel(rx_ctrl, base + NvRegReceiverControl);
	if (reg_delay(dev, NvRegReceiverStatus, NVREG_RCVSTAT_BUSY, 0,
		      NV_RXSTOP_DELAY1, NV_RXSTOP_DELAY1MAX))
		netdev_info(dev, "%s: ReceiverStatus remained busy\n",
			    __func__);

	udelay(NV_RXSTOP_DELAY2);
	if (!np->mac_in_use)
		writel(0, base + NvRegLinkSpeed);
}

static void nv_start_tx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 tx_ctrl = readl(base + NvRegTransmitterControl);

	tx_ctrl |= NVREG_XMITCTL_START;
	if (np->mac_in_use)
		tx_ctrl &= ~NVREG_XMITCTL_TX_PATH_EN;
	writel(tx_ctrl, base + NvRegTransmitterControl);
	pci_push(base);
}

static void nv_stop_tx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 tx_ctrl = readl(base + NvRegTransmitterControl);

	if (!np->mac_in_use)
		tx_ctrl &= ~NVREG_XMITCTL_START;
	else
		tx_ctrl |= NVREG_XMITCTL_TX_PATH_EN;
	writel(tx_ctrl, base + NvRegTransmitterControl);
	if (reg_delay(dev, NvRegTransmitterStatus, NVREG_XMITSTAT_BUSY, 0,
		      NV_TXSTOP_DELAY1, NV_TXSTOP_DELAY1MAX))
		netdev_info(dev, "%s: TransmitterStatus remained busy\n",
			    __func__);

	udelay(NV_TXSTOP_DELAY2);
	if (!np->mac_in_use)
		writel(readl(base + NvRegTransmitPoll) & NVREG_TRANSMITPOLL_MAC_ADDR_REV,
		       base + NvRegTransmitPoll);
}

static void nv_start_rxtx(struct net_device *dev)
{
	nv_start_rx(dev);
	nv_start_tx(dev);
}

static void nv_stop_rxtx(struct net_device *dev)
{
	nv_stop_rx(dev);
	nv_stop_tx(dev);
}

static void nv_txrx_reset(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);

	writel(NVREG_TXRXCTL_BIT2 | NVREG_TXRXCTL_RESET | np->txrxctl_bits, base + NvRegTxRxControl);
	pci_push(base);
	udelay(NV_TXRX_RESET_DELAY);
	writel(NVREG_TXRXCTL_BIT2 | np->txrxctl_bits, base + NvRegTxRxControl);
	pci_push(base);
}

static void nv_mac_reset(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 temp1, temp2, temp3;

	writel(NVREG_TXRXCTL_BIT2 | NVREG_TXRXCTL_RESET | np->txrxctl_bits, base + NvRegTxRxControl);
	pci_push(base);

	/* save registers since they will be cleared on reset */
	temp1 = readl(base + NvRegMacAddrA);
	temp2 = readl(base + NvRegMacAddrB);
	temp3 = readl(base + NvRegTransmitPoll);

	writel(NVREG_MAC_RESET_ASSERT, base + NvRegMacReset);
	pci_push(base);
	udelay(NV_MAC_RESET_DELAY);
	writel(0, base + NvRegMacReset);
	pci_push(base);
	udelay(NV_MAC_RESET_DELAY);

	/* restore saved registers */
	writel(temp1, base + NvRegMacAddrA);
	writel(temp2, base + NvRegMacAddrB);
	writel(temp3, base + NvRegTransmitPoll);

	writel(NVREG_TXRXCTL_BIT2 | np->txrxctl_bits, base + NvRegTxRxControl);
	pci_push(base);
}

/* Caller must appropriately lock netdev_priv(dev)->hwstats_lock */
static void nv_update_stats(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);

	/* If it happens that this is run in top-half context, then
	 * replace the spin_lock of hwstats_lock with
	 * spin_lock_irqsave() in calling functions. */
	WARN_ONCE(in_irq(), "forcedeth: estats spin_lock(_bh) from top-half");
	assert_spin_locked(&np->hwstats_lock);

	/* query hardware */
	np->estats.tx_bytes += readl(base + NvRegTxCnt);
	np->estats.tx_zero_rexmt += readl(base + NvRegTxZeroReXmt);
	np->estats.tx_one_rexmt += readl(base + NvRegTxOneReXmt);
	np->estats.tx_many_rexmt += readl(base + NvRegTxManyReXmt);
	np->estats.tx_late_collision += readl(base + NvRegTxLateCol);
	np->estats.tx_fifo_errors += readl(base + NvRegTxUnderflow);
	np->estats.tx_carrier_errors += readl(base + NvRegTxLossCarrier);
	np->estats.tx_excess_deferral += readl(base + NvRegTxExcessDef);
	np->estats.tx_retry_error += readl(base + NvRegTxRetryErr);
	np->estats.rx_frame_error += readl(base + NvRegRxFrameErr);
	np->estats.rx_extra_byte += readl(base + NvRegRxExtraByte);
	np->estats.rx_late_collision += readl(base + NvRegRxLateCol);
	np->estats.rx_runt += readl(base + NvRegRxRunt);
	np->estats.rx_frame_too_long += readl(base + NvRegRxFrameTooLong);
	np->estats.rx_over_errors += readl(base + NvRegRxOverflow);
	np->estats.rx_crc_errors += readl(base + NvRegRxFCSErr);
	np->estats.rx_frame_align_error += readl(base + NvRegRxFrameAlignErr);
	np->estats.rx_length_error += readl(base + NvRegRxLenErr);
	np->estats.rx_unicast += readl(base + NvRegRxUnicast);
	np->estats.rx_multicast += readl(base + NvRegRxMulticast);
	np->estats.rx_broadcast += readl(base + NvRegRxBroadcast);
	np->estats.rx_packets =
		np->estats.rx_unicast +
		np->estats.rx_multicast +
		np->estats.rx_broadcast;
	np->estats.rx_errors_total =
		np->estats.rx_crc_errors +
		np->estats.rx_over_errors +
		np->estats.rx_frame_error +
		(np->estats.rx_frame_align_error - np->estats.rx_extra_byte) +
		np->estats.rx_late_collision +
		np->estats.rx_runt +
		np->estats.rx_frame_too_long;
	np->estats.tx_errors_total =
		np->estats.tx_late_collision +
		np->estats.tx_fifo_errors +
		np->estats.tx_carrier_errors +
		np->estats.tx_excess_deferral +
		np->estats.tx_retry_error;

	if (np->driver_data & DEV_HAS_STATISTICS_V2) {
		np->estats.tx_deferral += readl(base + NvRegTxDef);
		np->estats.tx_packets += readl(base + NvRegTxFrame);
		np->estats.rx_bytes += readl(base + NvRegRxCnt);
		np->estats.tx_pause += readl(base + NvRegTxPause);
		np->estats.rx_pause += readl(base + NvRegRxPause);
		np->estats.rx_drop_frame += readl(base + NvRegRxDropFrame);
		np->estats.rx_errors_total += np->estats.rx_drop_frame;
	}

	if (np->driver_data & DEV_HAS_STATISTICS_V3) {
		np->estats.tx_unicast += readl(base + NvRegTxUnicast);
		np->estats.tx_multicast += readl(base + NvRegTxMulticast);
		np->estats.tx_broadcast += readl(base + NvRegTxBroadcast);
	}
}

/*
 * nv_get_stats64: dev->ndo_get_stats64 function
 * Get latest stats value from the nic.
 * Called with read_lock(&dev_base_lock) held for read -
 * only synchronized against unregister_netdevice.
 */
static void
nv_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *storage)
	__acquires(&netdev_priv(dev)->hwstats_lock)
	__releases(&netdev_priv(dev)->hwstats_lock)
{
	struct fe_priv *np = netdev_priv(dev);
	unsigned int syncp_start;

	/*
	 * Note: because HW stats are not always available and for
	 * consistency reasons, the following ifconfig stats are
	 * managed by software: rx_bytes, tx_bytes, rx_packets and
	 * tx_packets. The related hardware stats reported by ethtool
	 * should be equivalent to these ifconfig stats, with 4
	 * additional bytes per packet (Ethernet FCS CRC), except for
	 * tx_packets when TSO kicks in.
	 */

	/* software stats */
	do {
		syncp_start = u64_stats_fetch_begin_irq(&np->swstats_rx_syncp);
		storage->rx_packets       = np->stat_rx_packets;
		storage->rx_bytes         = np->stat_rx_bytes;
		storage->rx_dropped       = np->stat_rx_dropped;
		storage->rx_missed_errors = np->stat_rx_missed_errors;
	} while (u64_stats_fetch_retry_irq(&np->swstats_rx_syncp, syncp_start));

	do {
		syncp_start = u64_stats_fetch_begin_irq(&np->swstats_tx_syncp);
		storage->tx_packets = np->stat_tx_packets;
		storage->tx_bytes   = np->stat_tx_bytes;
		storage->tx_dropped = np->stat_tx_dropped;
	} while (u64_stats_fetch_retry_irq(&np->swstats_tx_syncp, syncp_start));

	/* If the nic supports hw counters then retrieve latest values */
	if (np->driver_data & DEV_HAS_STATISTICS_V123) {
		spin_lock_bh(&np->hwstats_lock);

		nv_update_stats(dev);

		/* generic stats */
		storage->rx_errors = np->estats.rx_errors_total;
		storage->tx_errors = np->estats.tx_errors_total;

		/* meaningful only when NIC supports stats v3 */
		storage->multicast = np->estats.rx_multicast;

		/* detailed rx_errors */
		storage->rx_length_errors = np->estats.rx_length_error;
		storage->rx_over_errors   = np->estats.rx_over_errors;
		storage->rx_crc_errors    = np->estats.rx_crc_errors;
		storage->rx_frame_errors  = np->estats.rx_frame_align_error;
		storage->rx_fifo_errors   = np->estats.rx_drop_frame;

		/* detailed tx_errors */
		storage->tx_carrier_errors = np->estats.tx_carrier_errors;
		storage->tx_fifo_errors    = np->estats.tx_fifo_errors;

		spin_unlock_bh(&np->hwstats_lock);
	}
}

/*
 * nv_alloc_rx: fill rx ring entries.
 * Return 1 if the allocations for the skbs failed and the
 * rx engine is without Available descriptors
 */
static int nv_alloc_rx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	struct ring_desc *less_rx;

	less_rx = np->get_rx.orig;
	if (less_rx-- == np->first_rx.orig)
		less_rx = np->last_rx.orig;

	while (np->put_rx.orig != less_rx) {
		struct sk_buff *skb = netdev_alloc_skb(dev, np->rx_buf_sz + NV_RX_ALLOC_PAD);
		if (skb) {
			np->put_rx_ctx->skb = skb;
			np->put_rx_ctx->dma = pci_map_single(np->pci_dev,
							     skb->data,
							     skb_tailroom(skb),
							     PCI_DMA_FROMDEVICE);
			if (pci_dma_mapping_error(np->pci_dev,
						  np->put_rx_ctx->dma)) {
				kfree_skb(skb);
				goto packet_dropped;
			}
			np->put_rx_ctx->dma_len = skb_tailroom(skb);
			np->put_rx.orig->buf = cpu_to_le32(np->put_rx_ctx->dma);
			wmb();
			np->put_rx.orig->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX_AVAIL);
			if (unlikely(np->put_rx.orig++ == np->last_rx.orig))
				np->put_rx.orig = np->first_rx.orig;
			if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
				np->put_rx_ctx = np->first_rx_ctx;
		} else {
packet_dropped:
			u64_stats_update_begin(&np->swstats_rx_syncp);
			np->stat_rx_dropped++;
			u64_stats_update_end(&np->swstats_rx_syncp);
			return 1;
		}
	}
	return 0;
}

static int nv_alloc_rx_optimized(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	struct ring_desc_ex *less_rx;

	less_rx = np->get_rx.ex;
	if (less_rx-- == np->first_rx.ex)
		less_rx = np->last_rx.ex;

	while (np->put_rx.ex != less_rx) {
		struct sk_buff *skb = netdev_alloc_skb(dev, np->rx_buf_sz + NV_RX_ALLOC_PAD);
		if (skb) {
			np->put_rx_ctx->skb = skb;
			np->put_rx_ctx->dma = pci_map_single(np->pci_dev,
							     skb->data,
							     skb_tailroom(skb),
							     PCI_DMA_FROMDEVICE);
			if (pci_dma_mapping_error(np->pci_dev,
						  np->put_rx_ctx->dma)) {
				kfree_skb(skb);
				goto packet_dropped;
			}
			np->put_rx_ctx->dma_len = skb_tailroom(skb);
			np->put_rx.ex->bufhigh = cpu_to_le32(dma_high(np->put_rx_ctx->dma));
			np->put_rx.ex->buflow = cpu_to_le32(dma_low(np->put_rx_ctx->dma));
			wmb();
			np->put_rx.ex->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX2_AVAIL);
			if (unlikely(np->put_rx.ex++ == np->last_rx.ex))
				np->put_rx.ex = np->first_rx.ex;
			if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
				np->put_rx_ctx = np->first_rx_ctx;
		} else {
packet_dropped:
			u64_stats_update_begin(&np->swstats_rx_syncp);
			np->stat_rx_dropped++;
			u64_stats_update_end(&np->swstats_rx_syncp);
			return 1;
		}
	}
	return 0;
}

/* If rx bufs are exhausted called after 50ms to attempt to refresh */
static void nv_do_rx_refill(unsigned long data)
{
	struct net_device *dev = (struct net_device *) data;
	struct fe_priv *np = netdev_priv(dev);

	/* Just reschedule NAPI rx processing */
	napi_schedule(&np->napi);
}

static void nv_init_rx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	int i;

	np->get_rx = np->put_rx = np->first_rx = np->rx_ring;

	if (!nv_optimized(np))
		np->last_rx.orig = &np->rx_ring.orig[np->rx_ring_size-1];
	else
		np->last_rx.ex = &np->rx_ring.ex[np->rx_ring_size-1];
	np->get_rx_ctx = np->put_rx_ctx = np->first_rx_ctx = np->rx_skb;
	np->last_rx_ctx = &np->rx_skb[np->rx_ring_size-1];

	for (i = 0; i < np->rx_ring_size; i++) {
		if (!nv_optimized(np)) {
			np->rx_ring.orig[i].flaglen = 0;
			np->rx_ring.orig[i].buf = 0;
		} else {
			np->rx_ring.ex[i].flaglen = 0;
			np->rx_ring.ex[i].txvlan = 0;
			np->rx_ring.ex[i].bufhigh = 0;
			np->rx_ring.ex[i].buflow = 0;
		}
		np->rx_skb[i].skb = NULL;
		np->rx_skb[i].dma = 0;
	}
}

static void nv_init_tx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	int i;

	np->get_tx = np->put_tx = np->first_tx = np->tx_ring;

	if (!nv_optimized(np))
		np->last_tx.orig = &np->tx_ring.orig[np->tx_ring_size-1];
	else
		np->last_tx.ex = &np->tx_ring.ex[np->tx_ring_size-1];
	np->get_tx_ctx = np->put_tx_ctx = np->first_tx_ctx = np->tx_skb;
	np->last_tx_ctx = &np->tx_skb[np->tx_ring_size-1];
	netdev_reset_queue(np->dev);
	np->tx_pkts_in_progress = 0;
	np->tx_change_owner = NULL;
	np->tx_end_flip = NULL;
	np->tx_stop = 0;

	for (i = 0; i < np->tx_ring_size; i++) {
		if (!nv_optimized(np)) {
			np->tx_ring.orig[i].flaglen = 0;
			np->tx_ring.orig[i].buf = 0;
		} else {
			np->tx_ring.ex[i].flaglen = 0;
			np->tx_ring.ex[i].txvlan = 0;
			np->tx_ring.ex[i].bufhigh = 0;
			np->tx_ring.ex[i].buflow = 0;
		}
		np->tx_skb[i].skb = NULL;
		np->tx_skb[i].dma = 0;
		np->tx_skb[i].dma_len = 0;
		np->tx_skb[i].dma_single = 0;
		np->tx_skb[i].first_tx_desc = NULL;
		np->tx_skb[i].next_tx_ctx = NULL;
	}
}

static int nv_init_ring(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);

	nv_init_tx(dev);
	nv_init_rx(dev);

	if (!nv_optimized(np))
		return nv_alloc_rx(dev);
	else
		return nv_alloc_rx_optimized(dev);
}

static void nv_unmap_txskb(struct fe_priv *np, struct nv_skb_map *tx_skb)
{
	if (tx_skb->dma) {
		if (tx_skb->dma_single)
			pci_unmap_single(np->pci_dev, tx_skb->dma,
					 tx_skb->dma_len,
					 PCI_DMA_TODEVICE);
		else
			pci_unmap_page(np->pci_dev, tx_skb->dma,
				       tx_skb->dma_len,
				       PCI_DMA_TODEVICE);
		tx_skb->dma = 0;
	}
}

static int nv_release_txskb(struct fe_priv *np, struct nv_skb_map *tx_skb)
{
	nv_unmap_txskb(np, tx_skb);
	if (tx_skb->skb) {
		dev_kfree_skb_any(tx_skb->skb);
		tx_skb->skb = NULL;
		return 1;
	}
	return 0;
}

static void nv_drain_tx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	unsigned int i;

	for (i = 0; i < np->tx_ring_size; i++) {
		if (!nv_optimized(np)) {
			np->tx_ring.orig[i].flaglen = 0;
			np->tx_ring.orig[i].buf = 0;
		} else {
			np->tx_ring.ex[i].flaglen = 0;
			np->tx_ring.ex[i].txvlan = 0;
			np->tx_ring.ex[i].bufhigh = 0;
			np->tx_ring.ex[i].buflow = 0;
		}
		if (nv_release_txskb(np, &np->tx_skb[i])) {
			u64_stats_update_begin(&np->swstats_tx_syncp);
			np->stat_tx_dropped++;
			u64_stats_update_end(&np->swstats_tx_syncp);
		}
		np->tx_skb[i].dma = 0;
		np->tx_skb[i].dma_len = 0;
		np->tx_skb[i].dma_single = 0;
		np->tx_skb[i].first_tx_desc = NULL;
		np->tx_skb[i].next_tx_ctx = NULL;
	}
	np->tx_pkts_in_progress = 0;
	np->tx_change_owner = NULL;
	np->tx_end_flip = NULL;
}

static void nv_drain_rx(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	int i;

	for (i = 0; i < np->rx_ring_size; i++) {
		if (!nv_optimized(np)) {
			np->rx_ring.orig[i].flaglen = 0;
			np->rx_ring.orig[i].buf = 0;
		} else {
			np->rx_ring.ex[i].flaglen = 0;
			np->rx_ring.ex[i].txvlan = 0;
			np->rx_ring.ex[i].bufhigh = 0;
			np->rx_ring.ex[i].buflow = 0;
		}
		wmb();
		if (np->rx_skb[i].skb) {
			pci_unmap_single(np->pci_dev, np->rx_skb[i].dma,
					 (skb_end_pointer(np->rx_skb[i].skb) -
					  np->rx_skb[i].skb->data),
					 PCI_DMA_FROMDEVICE);
			dev_kfree_skb(np->rx_skb[i].skb);
			np->rx_skb[i].skb = NULL;
		}
	}
}

static void nv_drain_rxtx(struct net_device *dev)
{
	nv_drain_tx(dev);
	nv_drain_rx(dev);
}

static inline u32 nv_get_empty_tx_slots(struct fe_priv *np)
{
	return (u32)(np->tx_ring_size - ((np->tx_ring_size + (np->put_tx_ctx - np->get_tx_ctx)) % np->tx_ring_size));
}

static void nv_legacybackoff_reseed(struct net_device *dev)
{
	u8 __iomem *base = get_hwbase(dev);
	u32 reg;
	u32 low;
	int tx_status = 0;

	reg = readl(base + NvRegSlotTime) & ~NVREG_SLOTTIME_MASK;
	get_random_bytes(&low, sizeof(low));
	reg |= low & NVREG_SLOTTIME_MASK;

	/* Need to stop tx before change takes effect.
	 * Caller has already gained np->lock.
	 */
	tx_status = readl(base + NvRegTransmitterControl) & NVREG_XMITCTL_START;
	if (tx_status)
		nv_stop_tx(dev);
	nv_stop_rx(dev);
	writel(reg, base + NvRegSlotTime);
	if (tx_status)
		nv_start_tx(dev);
	nv_start_rx(dev);
}

/* Gear Backoff Seeds */
#define BACKOFF_SEEDSET_ROWS	8
#define BACKOFF_SEEDSET_LFSRS	15

/* Known Good seed sets */
static const u32 main_seedset[BACKOFF_SEEDSET_ROWS][BACKOFF_SEEDSET_LFSRS] = {
	{145, 155, 165, 175, 185, 196, 235, 245, 255, 265, 275, 285, 660, 690, 874},
	{245, 255, 265, 575, 385, 298, 335, 345, 355, 366, 375, 385, 761, 790, 974},
	{145, 155, 165, 175, 185, 196, 235, 245, 255, 265, 275, 285, 660, 690, 874},
	{245, 255, 265, 575, 385, 298, 335, 345, 355, 366, 375, 386, 761, 790, 974},
	{266, 265, 276, 585, 397, 208, 345, 355, 365, 376, 385, 396, 771, 700, 984},
	{266, 265, 276, 586, 397, 208, 346, 355, 365, 376, 285, 396, 771, 700, 984},
	{366, 365, 376, 686, 497, 308, 447, 455, 466, 476, 485, 496, 871, 800,  84},
	{466, 465, 476, 786, 597, 408, 547, 555, 566, 576, 585, 597, 971, 900, 184} };

static const u32 gear_seedset[BACKOFF_SEEDSET_ROWS][BACKOFF_SEEDSET_LFSRS] = {
	{251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375,  30, 295},
	{351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
	{351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 397},
	{251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375,  30, 295},
	{251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375,  30, 295},
	{351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
	{351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
	{351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395} };

static void nv_gear_backoff_reseed(struct net_device *dev)
{
	u8 __iomem *base = get_hwbase(dev);
	u32 miniseed1, miniseed2, miniseed2_reversed, miniseed3, miniseed3_reversed;
	u32 temp, seedset, combinedSeed;
	int i;

	/* Setup seed for free running LFSR */
	/* We are going to read the time stamp counter 3 times
	   and swizzle bits around to increase randomness */
	get_random_bytes(&miniseed1, sizeof(miniseed1));
	miniseed1 &= 0x0fff;
	if (miniseed1 == 0)
		miniseed1 = 0xabc;

	get_random_bytes(&miniseed2, sizeof(miniseed2));
	miniseed2 &= 0x0fff;
	if (miniseed2 == 0)
		miniseed2 = 0xabc;
	miniseed2_reversed =
		((miniseed2 & 0xF00) >> 8) |
		 (miniseed2 & 0x0F0) |
		 ((miniseed2 & 0x00F) << 8);

	get_random_bytes(&miniseed3, sizeof(miniseed3));
	miniseed3 &= 0x0fff;
	if (miniseed3 == 0)
		miniseed3 = 0xabc;
	miniseed3_reversed =
		((miniseed3 & 0xF00) >> 8) |
		 (miniseed3 & 0x0F0) |
		 ((miniseed3 & 0x00F) << 8);

	combinedSeed = ((miniseed1 ^ miniseed2_reversed) << 12) |
		       (miniseed2 ^ miniseed3_reversed);

	/* Seeds can not be zero */
	if ((combinedSeed & NVREG_BKOFFCTRL_SEED_MASK) == 0)
		combinedSeed |= 0x08;
	if ((combinedSeed & (NVREG_BKOFFCTRL_SEED_MASK << NVREG_BKOFFCTRL_GEAR)) == 0)
		combinedSeed |= 0x8000;

	/* No need to disable tx here */
	temp = NVREG_BKOFFCTRL_DEFAULT | (0 << NVREG_BKOFFCTRL_SELECT);
	temp |= combinedSeed & NVREG_BKOFFCTRL_SEED_MASK;
	temp |= combinedSeed >> NVREG_BKOFFCTRL_GEAR;
	writel(temp, base + NvRegBackOffControl);

	/* Setup seeds for all gear LFSRs. */
	get_random_bytes(&seedset, sizeof(seedset));
	seedset = seedset % BACKOFF_SEEDSET_ROWS;
	for (i = 1; i <= BACKOFF_SEEDSET_LFSRS; i++) {
		temp = NVREG_BKOFFCTRL_DEFAULT | (i << NVREG_BKOFFCTRL_SELECT);
		temp |= main_seedset[seedset][i-1] & 0x3ff;
		temp |= ((gear_seedset[seedset][i-1] & 0x3ff) << NVREG_BKOFFCTRL_GEAR);
		writel(temp, base + NvRegBackOffControl);
	}
}

/*
 * nv_start_xmit: dev->hard_start_xmit function
 * Called with netif_tx_lock held.
 */
static netdev_tx_t nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 tx_flags = 0;
	u32 tx_flags_extra = (np->desc_ver == DESC_VER_1 ? NV_TX_LASTPACKET : NV_TX2_LASTPACKET);
	unsigned int fragments = skb_shinfo(skb)->nr_frags;
	unsigned int i;
	u32 offset = 0;
	u32 bcnt;
	u32 size = skb_headlen(skb);
	u32 entries = (size >> NV_TX2_TSO_MAX_SHIFT) + ((size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
	u32 empty_slots;
	struct ring_desc *put_tx;
	struct ring_desc *start_tx;
	struct ring_desc *prev_tx;
	struct nv_skb_map *prev_tx_ctx;
	struct nv_skb_map *tmp_tx_ctx = NULL, *start_tx_ctx = NULL;
	unsigned long flags;

	/* add fragments to entries count */
	for (i = 0; i < fragments; i++) {
		u32 frag_size = skb_frag_size(&skb_shinfo(skb)->frags[i]);

		entries += (frag_size >> NV_TX2_TSO_MAX_SHIFT) +
			   ((frag_size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
	}

	spin_lock_irqsave(&np->lock, flags);
	empty_slots = nv_get_empty_tx_slots(np);
	if (unlikely(empty_slots <= entries)) {
		netif_stop_queue(dev);
		np->tx_stop = 1;
		spin_unlock_irqrestore(&np->lock, flags);
		return NETDEV_TX_BUSY;
	}
	spin_unlock_irqrestore(&np->lock, flags);

	start_tx = put_tx = np->put_tx.orig;

	/* setup the header buffer */
	do {
		prev_tx = put_tx;
		prev_tx_ctx = np->put_tx_ctx;
		bcnt = (size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : size;
		np->put_tx_ctx->dma = pci_map_single(np->pci_dev, skb->data + offset, bcnt,
						PCI_DMA_TODEVICE);
		if (pci_dma_mapping_error(np->pci_dev,
					  np->put_tx_ctx->dma)) {
			/* on DMA mapping error - drop the packet */
			dev_kfree_skb_any(skb);
			u64_stats_update_begin(&np->swstats_tx_syncp);
			np->stat_tx_dropped++;
			u64_stats_update_end(&np->swstats_tx_syncp);
			return NETDEV_TX_OK;
		}
		np->put_tx_ctx->dma_len = bcnt;
		np->put_tx_ctx->dma_single = 1;
		put_tx->buf = cpu_to_le32(np->put_tx_ctx->dma);
		put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

		tx_flags = np->tx_flags;
		offset += bcnt;
		size -= bcnt;
		if (unlikely(put_tx++ == np->last_tx.orig))
			put_tx = np->first_tx.orig;
		if (unlikely(np->put_tx_ctx++ == np->last_tx_ctx))
			np->put_tx_ctx = np->first_tx_ctx;
	} while (size);

	/* setup the fragments */
	for (i = 0; i < fragments; i++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		u32 frag_size = skb_frag_size(frag);
		offset = 0;

		do {
			prev_tx = put_tx;
			prev_tx_ctx = np->put_tx_ctx;
			if (!start_tx_ctx)
				start_tx_ctx = tmp_tx_ctx = np->put_tx_ctx;

			bcnt = (frag_size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : frag_size;
			np->put_tx_ctx->dma = skb_frag_dma_map(
							&np->pci_dev->dev,
							frag, offset,
							bcnt,
							DMA_TO_DEVICE);
			if (dma_mapping_error(&np->pci_dev->dev, np->put_tx_ctx->dma)) {

				/* Unwind the mapped fragments */
				do {
					nv_unmap_txskb(np, start_tx_ctx);
					if (unlikely(tmp_tx_ctx++ == np->last_tx_ctx))
						tmp_tx_ctx = np->first_tx_ctx;
				} while (tmp_tx_ctx != np->put_tx_ctx);
				dev_kfree_skb_any(skb);
				np->put_tx_ctx = start_tx_ctx;
				u64_stats_update_begin(&np->swstats_tx_syncp);
				np->stat_tx_dropped++;
				u64_stats_update_end(&np->swstats_tx_syncp);
				return NETDEV_TX_OK;
			}

			np->put_tx_ctx->dma_len = bcnt;
			np->put_tx_ctx->dma_single = 0;
			put_tx->buf = cpu_to_le32(np->put_tx_ctx->dma);
			put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

			offset += bcnt;
			frag_size -= bcnt;
			if (unlikely(put_tx++ == np->last_tx.orig))
				put_tx = np->first_tx.orig;
			if (unlikely(np->put_tx_ctx++ == np->last_tx_ctx))
				np->put_tx_ctx = np->first_tx_ctx;
		} while (frag_size);
	}

	/* set last fragment flag  */
	prev_tx->flaglen |= cpu_to_le32(tx_flags_extra);

	/* save skb in this slot's context area */
	prev_tx_ctx->skb = skb;

	if (skb_is_gso(skb))
		tx_flags_extra = NV_TX2_TSO | (skb_shinfo(skb)->gso_size << NV_TX2_TSO_SHIFT);
	else
		tx_flags_extra = skb->ip_summed == CHECKSUM_PARTIAL ?
			 NV_TX2_CHECKSUM_L3 | NV_TX2_CHECKSUM_L4 : 0;

	spin_lock_irqsave(&np->lock, flags);

	/* set tx flags */
	start_tx->flaglen |= cpu_to_le32(tx_flags | tx_flags_extra);

	netdev_sent_queue(np->dev, skb->len);

	skb_tx_timestamp(skb);

	np->put_tx.orig = put_tx;

	spin_unlock_irqrestore(&np->lock, flags);

	writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
	return NETDEV_TX_OK;
}

static netdev_tx_t nv_start_xmit_optimized(struct sk_buff *skb,
					   struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 tx_flags = 0;
	u32 tx_flags_extra;
	unsigned int fragments = skb_shinfo(skb)->nr_frags;
	unsigned int i;
	u32 offset = 0;
	u32 bcnt;
	u32 size = skb_headlen(skb);
	u32 entries = (size >> NV_TX2_TSO_MAX_SHIFT) + ((size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
	u32 empty_slots;
	struct ring_desc_ex *put_tx;
	struct ring_desc_ex *start_tx;
	struct ring_desc_ex *prev_tx;
	struct nv_skb_map *prev_tx_ctx;
	struct nv_skb_map *start_tx_ctx = NULL;
	struct nv_skb_map *tmp_tx_ctx = NULL;
	unsigned long flags;

	/* add fragments to entries count */
	for (i = 0; i < fragments; i++) {
		u32 frag_size = skb_frag_size(&skb_shinfo(skb)->frags[i]);

		entries += (frag_size >> NV_TX2_TSO_MAX_SHIFT) +
			   ((frag_size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
	}

	spin_lock_irqsave(&np->lock, flags);
	empty_slots = nv_get_empty_tx_slots(np);
	if (unlikely(empty_slots <= entries)) {
		netif_stop_queue(dev);
		np->tx_stop = 1;
		spin_unlock_irqrestore(&np->lock, flags);
		return NETDEV_TX_BUSY;
	}
	spin_unlock_irqrestore(&np->lock, flags);

	start_tx = put_tx = np->put_tx.ex;
	start_tx_ctx = np->put_tx_ctx;

	/* setup the header buffer */
	do {
		prev_tx = put_tx;
		prev_tx_ctx = np->put_tx_ctx;
		bcnt = (size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : size;
		np->put_tx_ctx->dma = pci_map_single(np->pci_dev, skb->data + offset, bcnt,
						PCI_DMA_TODEVICE);
		if (pci_dma_mapping_error(np->pci_dev,
					  np->put_tx_ctx->dma)) {
			/* on DMA mapping error - drop the packet */
			dev_kfree_skb_any(skb);
			u64_stats_update_begin(&np->swstats_tx_syncp);
			np->stat_tx_dropped++;
			u64_stats_update_end(&np->swstats_tx_syncp);
			return NETDEV_TX_OK;
		}
		np->put_tx_ctx->dma_len = bcnt;
		np->put_tx_ctx->dma_single = 1;
		put_tx->bufhigh = cpu_to_le32(dma_high(np->put_tx_ctx->dma));
		put_tx->buflow = cpu_to_le32(dma_low(np->put_tx_ctx->dma));
		put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

		tx_flags = NV_TX2_VALID;
		offset += bcnt;
		size -= bcnt;
		if (unlikely(put_tx++ == np->last_tx.ex))
			put_tx = np->first_tx.ex;
		if (unlikely(np->put_tx_ctx++ == np->last_tx_ctx))
			np->put_tx_ctx = np->first_tx_ctx;
	} while (size);

	/* setup the fragments */
	for (i = 0; i < fragments; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		u32 frag_size = skb_frag_size(frag);
		offset = 0;

		do {
			prev_tx = put_tx;
			prev_tx_ctx = np->put_tx_ctx;
			bcnt = (frag_size > NV_TX2_TSO_MAX_SIZE) ? NV_TX2_TSO_MAX_SIZE : frag_size;
			if (!start_tx_ctx)
				start_tx_ctx = tmp_tx_ctx = np->put_tx_ctx;
			np->put_tx_ctx->dma = skb_frag_dma_map(
							&np->pci_dev->dev,
							frag, offset,
							bcnt,
							DMA_TO_DEVICE);

			if (dma_mapping_error(&np->pci_dev->dev, np->put_tx_ctx->dma)) {

				/* Unwind the mapped fragments */
				do {
					nv_unmap_txskb(np, start_tx_ctx);
					if (unlikely(tmp_tx_ctx++ == np->last_tx_ctx))
						tmp_tx_ctx = np->first_tx_ctx;
				} while (tmp_tx_ctx != np->put_tx_ctx);
				dev_kfree_skb_any(skb);
				np->put_tx_ctx = start_tx_ctx;
				u64_stats_update_begin(&np->swstats_tx_syncp);
				np->stat_tx_dropped++;
				u64_stats_update_end(&np->swstats_tx_syncp);
				return NETDEV_TX_OK;
			}
			np->put_tx_ctx->dma_len = bcnt;
			np->put_tx_ctx->dma_single = 0;
			put_tx->bufhigh = cpu_to_le32(dma_high(np->put_tx_ctx->dma));
			put_tx->buflow = cpu_to_le32(dma_low(np->put_tx_ctx->dma));
			put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

			offset += bcnt;
			frag_size -= bcnt;
			if (unlikely(put_tx++ == np->last_tx.ex))
				put_tx = np->first_tx.ex;
			if (unlikely(np->put_tx_ctx++ == np->last_tx_ctx))
				np->put_tx_ctx = np->first_tx_ctx;
		} while (frag_size);
	}

	/* set last fragment flag  */
	prev_tx->flaglen |= cpu_to_le32(NV_TX2_LASTPACKET);

	/* save skb in this slot's context area */
	prev_tx_ctx->skb = skb;

	if (skb_is_gso(skb))
		tx_flags_extra = NV_TX2_TSO | (skb_shinfo(skb)->gso_size << NV_TX2_TSO_SHIFT);
	else
		tx_flags_extra = skb->ip_summed == CHECKSUM_PARTIAL ?
			 NV_TX2_CHECKSUM_L3 | NV_TX2_CHECKSUM_L4 : 0;

	/* vlan tag */
	if (skb_vlan_tag_present(skb))
		start_tx->txvlan = cpu_to_le32(NV_TX3_VLAN_TAG_PRESENT |
					skb_vlan_tag_get(skb));
	else
		start_tx->txvlan = 0;

	spin_lock_irqsave(&np->lock, flags);

	if (np->tx_limit) {
		/* Limit the number of outstanding tx. Setup all fragments, but
		 * do not set the VALID bit on the first descriptor. Save a pointer
		 * to that descriptor and also for next skb_map element.
		 */

		if (np->tx_pkts_in_progress == NV_TX_LIMIT_COUNT) {
			if (!np->tx_change_owner)
				np->tx_change_owner = start_tx_ctx;

			/* remove VALID bit */
			tx_flags &= ~NV_TX2_VALID;
			start_tx_ctx->first_tx_desc = start_tx;
			start_tx_ctx->next_tx_ctx = np->put_tx_ctx;
			np->tx_end_flip = np->put_tx_ctx;
		} else {
			np->tx_pkts_in_progress++;
		}
	}

	/* set tx flags */
	start_tx->flaglen |= cpu_to_le32(tx_flags | tx_flags_extra);

	netdev_sent_queue(np->dev, skb->len);

	skb_tx_timestamp(skb);

	np->put_tx.ex = put_tx;

	spin_unlock_irqrestore(&np->lock, flags);

	writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
	return NETDEV_TX_OK;
}

static inline void nv_tx_flip_ownership(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);

	np->tx_pkts_in_progress--;
	if (np->tx_change_owner) {
		np->tx_change_owner->first_tx_desc->flaglen |=
			cpu_to_le32(NV_TX2_VALID);
		np->tx_pkts_in_progress++;

		np->tx_change_owner = np->tx_change_owner->next_tx_ctx;
		if (np->tx_change_owner == np->tx_end_flip)
			np->tx_change_owner = NULL;

		writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
	}
}

/*
 * nv_tx_done: check for completed packets, release the skbs.
 *
 * Caller must own np->lock.
 */
static int nv_tx_done(struct net_device *dev, int limit)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 flags;
	int tx_work = 0;
	struct ring_desc *orig_get_tx = np->get_tx.orig;
	unsigned int bytes_compl = 0;

	while ((np->get_tx.orig != np->put_tx.orig) &&
	       !((flags = le32_to_cpu(np->get_tx.orig->flaglen)) & NV_TX_VALID) &&
	       (tx_work < limit)) {

		nv_unmap_txskb(np, np->get_tx_ctx);

		if (np->desc_ver == DESC_VER_1) {
			if (flags & NV_TX_LASTPACKET) {
				if (flags & NV_TX_ERROR) {
					if ((flags & NV_TX_RETRYERROR)
					    && !(flags & NV_TX_RETRYCOUNT_MASK))
						nv_legacybackoff_reseed(dev);
				} else {
					u64_stats_update_begin(&np->swstats_tx_syncp);
					np->stat_tx_packets++;
					np->stat_tx_bytes += np->get_tx_ctx->skb->len;
					u64_stats_update_end(&np->swstats_tx_syncp);
				}
				bytes_compl += np->get_tx_ctx->skb->len;
				dev_kfree_skb_any(np->get_tx_ctx->skb);
				np->get_tx_ctx->skb = NULL;
				tx_work++;
			}
		} else {
			if (flags & NV_TX2_LASTPACKET) {
				if (flags & NV_TX2_ERROR) {
					if ((flags & NV_TX2_RETRYERROR)
					    && !(flags & NV_TX2_RETRYCOUNT_MASK))
						nv_legacybackoff_reseed(dev);
				} else {
					u64_stats_update_begin(&np->swstats_tx_syncp);
					np->stat_tx_packets++;
					np->stat_tx_bytes += np->get_tx_ctx->skb->len;
					u64_stats_update_end(&np->swstats_tx_syncp);
				}
				bytes_compl += np->get_tx_ctx->skb->len;
				dev_kfree_skb_any(np->get_tx_ctx->skb);
				np->get_tx_ctx->skb = NULL;
				tx_work++;
			}
		}
		if (unlikely(np->get_tx.orig++ == np->last_tx.orig))
			np->get_tx.orig = np->first_tx.orig;
		if (unlikely(np->get_tx_ctx++ == np->last_tx_ctx))
			np->get_tx_ctx = np->first_tx_ctx;
	}

	netdev_completed_queue(np->dev, tx_work, bytes_compl);

	if (unlikely((np->tx_stop == 1) && (np->get_tx.orig != orig_get_tx))) {
		np->tx_stop = 0;
		netif_wake_queue(dev);
	}
	return tx_work;
}

static int nv_tx_done_optimized(struct net_device *dev, int limit)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 flags;
	int tx_work = 0;
	struct ring_desc_ex *orig_get_tx = np->get_tx.ex;
	unsigned long bytes_cleaned = 0;

	while ((np->get_tx.ex != np->put_tx.ex) &&
	       !((flags = le32_to_cpu(np->get_tx.ex->flaglen)) & NV_TX2_VALID) &&
	       (tx_work < limit)) {

		nv_unmap_txskb(np, np->get_tx_ctx);

		if (flags & NV_TX2_LASTPACKET) {
			if (flags & NV_TX2_ERROR) {
				if ((flags & NV_TX2_RETRYERROR)
				    && !(flags & NV_TX2_RETRYCOUNT_MASK)) {
					if (np->driver_data & DEV_HAS_GEAR_MODE)
						nv_gear_backoff_reseed(dev);
					else
						nv_legacybackoff_reseed(dev);
				}
			} else {
				u64_stats_update_begin(&np->swstats_tx_syncp);
				np->stat_tx_packets++;
				np->stat_tx_bytes += np->get_tx_ctx->skb->len;
				u64_stats_update_end(&np->swstats_tx_syncp);
			}

			bytes_cleaned += np->get_tx_ctx->skb->len;
			dev_kfree_skb_any(np->get_tx_ctx->skb);
			np->get_tx_ctx->skb = NULL;
			tx_work++;

			if (np->tx_limit)
				nv_tx_flip_ownership(dev);
		}

		if (unlikely(np->get_tx.ex++ == np->last_tx.ex))
			np->get_tx.ex = np->first_tx.ex;
		if (unlikely(np->get_tx_ctx++ == np->last_tx_ctx))
			np->get_tx_ctx = np->first_tx_ctx;
	}

	netdev_completed_queue(np->dev, tx_work, bytes_cleaned);

	if (unlikely((np->tx_stop == 1) && (np->get_tx.ex != orig_get_tx))) {
		np->tx_stop = 0;
		netif_wake_queue(dev);
	}
	return tx_work;
}

/*
 * nv_tx_timeout: dev->tx_timeout function
 * Called with netif_tx_lock held.
 */
static void nv_tx_timeout(struct net_device *dev)
{
	struct fe_priv *np = netdev_priv(dev);
	u8 __iomem *base = get_hwbase(dev);
	u32 status;
	union ring_type put_tx;
	int saved_tx_limit;

	if (np->msi_flags & NV_MSI_X_ENABLED)
		status = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
	else
		status = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;

	netdev_warn(dev, "Got tx_timeout. irq status: %08x\n", status);

	if (unlikely(debug_tx_timeout)) {
		int i;

		netdev_info(dev, "Ring at %lx\n", (unsigned long)np->ring_addr);
		netdev_info(dev, "Dumping tx registers\n");
		for (i = 0; i <= np->register_size; i += 32) {
			netdev_info(dev,
				    "%3x: %08x %08x %08x %08x "
				    "%08x %08x %08x %08x\n",
				    i,
				    readl(base + i + 0), readl(base + i + 4),
				    readl(base + i + 8), readl(base + i + 12),
				    readl(base + i + 16), readl(base + i + 20),
				    readl(base + i + 24), readl(base + i + 28));
		}
		netdev_info(dev, "Dumping tx ring\n");
		for (i = 0; i < np->tx_ring_size; i += 4) {
			if (!nv_optimized(np)) {
				netdev_info(dev,
					    "%03x: %08x %08x // %08x %08x "
					    "// %08x %08x // %08x %08x\n",
					    i,
					    le32_to_cpu(np->tx_ring.orig[i].buf),
					    le32_to_cpu(np->tx_ring.orig[i].flaglen),
					    le32_to_cpu(np->tx_ring.orig[i+1].buf),
					    le32_to_cpu(np->tx_ring.orig[i+1].flaglen),
					    le32_to_cpu(np->tx_ring.orig[i+2].buf),
					    le32_to_cpu(np->tx_ring.orig[i+2].flaglen),
					    le32_to_cpu(np->tx_ring.orig[i+3].buf),
					    le32_to_cpu(np->tx_ring.orig[i+3].flaglen));
			} else {
				netdev_info(dev,
					    "%03x: %08x %08x %08x "
					    "// %08x %08x %08x "
					    "// %08x %08x %08x "
					    "// %08x %08x %08x\n",
					    i,
					    le32_to_cpu(np->tx_ring.ex[i].bufhigh),
					    le32_to_cpu(np->tx_ring.ex[i].buflow),
					    le32_to_cpu(np->tx_ring.ex[i].flaglen),
					    le32_to_cpu(np->tx_ring.ex[i+1].bufhigh),
					    le32_to_cpu(np->tx_ring.ex[i+1].buflow),
					    le32_to_cpu(np->tx_ring.ex[i+1].flaglen),
					    le32_to_cpu(np->tx_ring.ex[i+2].bufhigh),
					    le32_to_cpu(np->tx_ring.ex[i+2].buflow),
					    le32_to_cpu(np->tx_ring.ex[i+2].flaglen),
					    le32_to_cpu(np->tx_ring.ex[i+3].bufhigh),
					    le32_to_cpu(np->tx_ring.ex[i+3].buflow),
					    le32_to_cpu(np->tx_ring.ex[i+3].flaglen));
			}
		}
	}

	spin_lock_irq(&np->lock);

	/* 1) stop tx engine */
	nv_stop_tx(dev);

	/* 2) complete any outstanding tx and do not give HW any limited tx pkts */
	saved_tx_limit = np->tx_limit;
	np->tx_limit = 0; /* prevent giving HW any limited pkts */
	np->tx_stop = 0;  /* prevent waking tx queue */
	if (!nv_optimized(np))
		nv_tx_done(dev, np->tx_ring_size);
	else
		nv_tx_done_optimized(dev, np->tx_ring_size);

	/* save current HW position */
	if (np->tx_change_owner)
		put_tx.ex = np->tx_change_owner->first_tx_desc;
	else
		put_tx = np->put_tx;

	/* 3) clear all tx state */
	nv_drain_tx(dev);
	nv_init_tx(dev);

	/* 4) restore state to current HW position */
	np->get_tx = np->put_tx = put_tx;
	np->tx_limit = saved_tx_limit;

	/* 5) restart tx engine */
	nv_start_tx(dev);
	netif_wake_queue(dev);
	spin_unlock_irq(&np->lock);
}

/*
 * Called when the nic notices a mismatch between the actual data len on the
 * wire and the len indicated in the 802 header
 */
static int nv_getlen(struct net_device *dev, void *packet, int datalen)
{
	int hdrlen;	/* length of the 802 header */
	int protolen;	/* length as stored in the proto field */

	/* 1) calculate len according to header */
	if (((struct vlan_ethhdr *)packet)->h_vlan_proto == htons(ETH_P_8021Q)) {
		protolen = ntohs(((struct vlan_ethhdr *)packet)->h_vlan_encapsulated_proto);
		hdrlen = VLAN_HLEN;
	} else {
		protolen = ntohs(((struct ethhdr *)packet)->h_proto);
		hdrlen = ETH_HLEN;
	}
	if (protolen > ETH_DATA_LEN)
		return datalen; /* Value in proto field not a len, no checks possible */

	protolen += hdrlen;
	/* consistency checks: */
	if (datalen > ETH_ZLEN) {
		if (datalen >= protolen) {
			/* more data on wire than in 802 header, trim of
			 * additional data.
			 */
			return protolen;
		} else {
			/* less data on wire than mentioned in header.
			 * Discard the packet.
			 */
			return -1;
		}
	} else {
		/* short packet. Accept only if 802 values are also short */
		if (protolen > ETH_ZLEN) {
			return -1;
		}
		return datalen;
	}
}

static int nv_rx_process(struct net_device *dev, int limit)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 flags;
	int rx_work = 0;
	struct sk_buff *skb;
	int len;

	while ((np->get_rx.orig != np->put_rx.orig) &&
	      !((flags = le32_to_cpu(np->get_rx.orig->flaglen)) & NV_RX_AVAIL) &&
		(rx_work < limit)) {

		/*
		 * the packet is for us - immediately tear down the pci mapping.
		 * TODO: check if a prefetch of the first cacheline improves
		 * the performance.
		 */
		pci_unmap_single(np->pci_dev, np->get_rx_ctx->dma,
				np->get_rx_ctx->dma_len,
				PCI_DMA_FROMDEVICE);
		skb = np->get_rx_ctx->skb;
		np->get_rx_ctx->skb = NULL;

		/* look at what we actually got: */
		if (np->desc_ver == DESC_VER_1) {
			if (likely(flags & NV_RX_DESCRIPTORVALID)) {
				len = flags & LEN_MASK_V1;
				if (unlikely(flags & NV_RX_ERROR)) {
					if ((flags & NV_RX_ERROR_MASK) == NV_RX_ERROR4) {
						len = nv_getlen(dev, skb->data, len);
						if (len < 0) {
							dev_kfree_skb(skb);
							goto next_pkt;
						}
					}
					/* framing errors are soft errors */
					else if ((flags & NV_RX_ERROR_MASK) == NV_RX_FRAMINGERR) {
						if (flags & NV_RX_SUBTRACT1)
							len--;
					}
					/* the rest are hard errors */
					else {
						if (flags & NV_RX_MISSEDFRAME) {
							u64_stats_update_begin(&np->swstats_rx_syncp);
							np->stat_rx_missed_errors++;
							u64_stats_update_end(&np->swstats_rx_syncp);
						}
						dev_kfree_skb(skb);
						goto next_pkt;
					}
				}
			} else {
				dev_kfree_skb(skb);
				goto next_pkt;
			}
		} else {
			if (likely(flags & NV_RX2_DESCRIPTORVALID)) {
				len = flags & LEN_MASK_V2;
				if (unlikely(flags & NV_RX2_ERROR)) {
					if ((flags & NV_RX2_ERROR_MASK) == NV_RX2_ERROR4) {
						len = nv_getlen(dev, skb->data, len);
						if (len < 0) {
							dev_kfree_skb(skb);
							goto next_pkt;
						}
					}
					/* framing errors are soft errors */
					else if ((flags & NV_RX2_ERROR_MASK) == NV_RX2_FRAMINGERR) {
						if (flags & NV_RX2_SUBTRACT1)
							len--;
					}
					/* the rest are hard errors */
					else {
						dev_kfree_skb(skb);
						goto next_pkt;
					}
				}
				if (((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_TCP) || /*ip and tcp */
				    ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_UDP))   /*ip and udp */
					skb->ip_summed = CHECKSUM_UNNECESSARY;
			} else {
				dev_kfree_skb(skb);
				goto next_pkt;
			}
		}
		/* got a valid packet - forward it to the network core */
		skb_put(skb, len);
		skb->protocol = eth_type_trans(skb, dev);
		napi_gro_receive(&np->napi, skb);
		u64_stats_update_begin(&np->swstats_rx_syncp);
		np->stat_rx_packets++;
		np->stat_rx_bytes += len;
		u64_stats_update_end(&np->swstats_rx_syncp);
next_pkt:
		if (unlikely(np->get_rx.orig++ == np->last_rx.orig))
			np->get_rx.orig = np->first_rx.orig;
		if (unlikely(np->get_rx_ctx++ == np->last_rx_ctx))
			np->get_rx_ctx = np->first_rx_ctx;

		rx_work++;
	}

	return rx_work;
}

static int nv_rx_process_optimized(struct net_device *dev, int limit)
{
	struct fe_priv *np = netdev_priv(dev);
	u32 flags;
	u32 vlanflags = 0;
	int rx_work = 0;
	struct sk_buff *skb;
	int len;

	while ((np->get_rx.ex != np->put_rx.ex) &&
	      !((flags = le32_to_cpu(np->get_rx.ex->flaglen)) & NV_RX2_AVAIL) &&
	      (rx_work < limit)) {

		/*
		 * the packet is for us - immediately tear down the pci mapping.
		 * TODO: check if a prefetch of the first cacheline improves