kbuild: document howto build external modules using several directories

[linux-2.6/verdex.git] / drivers / net / 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. It's neither supported nor endorsed
 *      by NVIDIA Corp. Use at your own risk.
 *
 * 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 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Changelog:
 *      0.01: 05 Oct 2003: First release that compiles without warnings.
 *      0.02: 05 Oct 2003: Fix bug for nv_drain_tx: do not try to free NULL skbs.
 *                         Check all PCI BARs for the register window.
 *                         udelay added to mii_rw.
 *      0.03: 06 Oct 2003: Initialize dev->irq.
 *      0.04: 07 Oct 2003: Initialize np->lock, reduce handled irqs, add printks.
 *      0.05: 09 Oct 2003: printk removed again, irq status print tx_timeout.
 *      0.06: 10 Oct 2003: MAC Address read updated, pff flag generation updated,
 *                         irq mask updated
 *      0.07: 14 Oct 2003: Further irq mask updates.
 *      0.08: 20 Oct 2003: rx_desc.Length initialization added, nv_alloc_rx refill
 *                         added into irq handler, NULL check for drain_ring.
 *      0.09: 20 Oct 2003: Basic link speed irq implementation. Only handle the
 *                         requested interrupt sources.
 *      0.10: 20 Oct 2003: First cleanup for release.
 *      0.11: 21 Oct 2003: hexdump for tx added, rx buffer sizes increased.
 *                         MAC Address init fix, set_multicast cleanup.
 *      0.12: 23 Oct 2003: Cleanups for release.
 *      0.13: 25 Oct 2003: Limit for concurrent tx packets increased to 10.
 *                         Set link speed correctly. start rx before starting
 *                         tx (nv_start_rx sets the link speed).
 *      0.14: 25 Oct 2003: Nic dependant irq mask.
 *      0.15: 08 Nov 2003: fix smp deadlock with set_multicast_list during
 *                         open.
 *      0.16: 15 Nov 2003: include file cleanup for ppc64, rx buffer size
 *                         increased to 1628 bytes.
 *      0.17: 16 Nov 2003: undo rx buffer size increase. Substract 1 from
 *                         the tx length.
 *      0.18: 17 Nov 2003: fix oops due to late initialization of dev_stats
 *      0.19: 29 Nov 2003: Handle RxNoBuf, detect & handle invalid mac
 *                         addresses, really stop rx if already running
 *                         in nv_start_rx, clean up a bit.
 *      0.20: 07 Dec 2003: alloc fixes
 *      0.21: 12 Jan 2004: additional alloc fix, nic polling fix.
 *      0.22: 19 Jan 2004: reprogram timer to a sane rate, avoid lockup
 *                         on close.
 *      0.23: 26 Jan 2004: various small cleanups
 *      0.24: 27 Feb 2004: make driver even less anonymous in backtraces
 *      0.25: 09 Mar 2004: wol support
 *      0.26: 03 Jun 2004: netdriver specific annotation, sparse-related fixes
 *      0.27: 19 Jun 2004: Gigabit support, new descriptor rings,
 *                         added CK804/MCP04 device IDs, code fixes
 *                         for registers, link status and other minor fixes.
 *      0.28: 21 Jun 2004: Big cleanup, making driver mostly endian safe
 *      0.29: 31 Aug 2004: Add backup timer for link change notification.
 *      0.30: 25 Sep 2004: rx checksum support for nf 250 Gb. Add rx reset
 *                         into nv_close, otherwise reenabling for wol can
 *                         cause DMA to kfree'd memory.
 *      0.31: 14 Nov 2004: ethtool support for getting/setting link
 *                         capabilities.
 *      0.32: 16 Apr 2005: RX_ERROR4 handling added.
 *      0.33: 16 May 2005: Support for MCP51 added.
 *      0.34: 18 Jun 2005: Add DEV_NEED_LINKTIMER to all nForce nics.
 *      0.35: 26 Jun 2005: Support for MCP55 added.
 *      0.36: 28 Jun 2005: Add jumbo frame support.
 *      0.37: 10 Jul 2005: Additional ethtool support, cleanup of pci id list
 *      0.38: 16 Jul 2005: tx irq rewrite: Use global flags instead of
 *                         per-packet flags.
 *      0.39: 18 Jul 2005: Add 64bit descriptor support.
 *      0.40: 19 Jul 2005: Add support for mac address change.
 *      0.41: 30 Jul 2005: Write back original MAC in nv_close instead
 *                         of nv_remove
 *      0.42: 06 Aug 2005: Fix lack of link speed initialization
 *                         in the second (and later) nv_open call
 *      0.43: 10 Aug 2005: Add support for tx checksum.
 *      0.44: 20 Aug 2005: Add support for scatter gather and segmentation.
 *      0.45: 18 Sep 2005: Remove nv_stop/start_rx from every link check
 *      0.46: 20 Oct 2005: Add irq optimization modes.
 *      0.47: 26 Oct 2005: Add phyaddr 0 in phy scan.
 *      0.48: 24 Dec 2005: Disable TSO, bugfix for pci_map_single
 *
 * 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 FORCEDETH_VERSION               "0.48"
#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/spinlock.h>
#include <linux/ethtool.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/mii.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/if_vlan.h>

#include <asm/irq.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#if 0
#define dprintk                 printk
#else
#define dprintk(x...)           do { } while (0)
#endif


/*
 * Hardware access:
 */

#define DEV_NEED_TIMERIRQ       0x0001  /* set the timer irq flag in the irq mask */
#define DEV_NEED_LINKTIMER      0x0002  /* poll link settings. Relies on the timer irq */
#define DEV_HAS_LARGEDESC       0x0004  /* device supports jumbo frames and needs packet format 2 */
#define DEV_HAS_HIGH_DMA        0x0008  /* device supports 64bit dma */
#define DEV_HAS_CHECKSUM        0x0010  /* device supports tx and rx checksum offloads */

enum {
        NvRegIrqStatus = 0x000,
#define NVREG_IRQSTAT_MIIEVENT  0x040
#define NVREG_IRQSTAT_MASK              0x1ff
        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_TX_ERROR              0x0080
#define NVREG_IRQ_TX1                   0x0100
#define NVREG_IRQMASK_THROUGHPUT        0x00df
#define NVREG_IRQMASK_CPU               0x0040

#define NVREG_IRQ_UNKNOWN       (~(NVREG_IRQ_RX_ERROR|NVREG_IRQ_RX|NVREG_IRQ_RX_NOBUF|NVREG_IRQ_TX_ERR| \
                                        NVREG_IRQ_TX_OK|NVREG_IRQ_TIMER|NVREG_IRQ_LINK|NVREG_IRQ_TX_ERROR| \
                                        NVREG_IRQ_TX1))

        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   970
#define NVREG_POLL_DEFAULT_CPU  13
        NvRegMisc1 = 0x080,
#define NVREG_MISC1_HD          0x02
#define NVREG_MISC1_FORCE       0x3b0f3c

        NvRegTransmitterControl = 0x084,
#define NVREG_XMITCTL_START     0x01
        NvRegTransmitterStatus = 0x088,
#define NVREG_XMITSTAT_BUSY     0x01

        NvRegPacketFilterFlags = 0x8c,
#define NVREG_PFF_ALWAYS        0x7F0008
#define NVREG_PFF_PROMISC       0x80
#define NVREG_PFF_MYADDR        0x20

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

        NvRegRandomSeed = 0x9c,
#define NVREG_RNDSEED_MASK      0x00ff
#define NVREG_RNDSEED_FORCE     0x7f00
#define NVREG_RNDSEED_FORCE2    0x2d00
#define NVREG_RNDSEED_FORCE3    0x7400

        NvRegUnknownSetupReg1 = 0xA0,
#define NVREG_UNKSETUP1_VAL     0x16070f
        NvRegUnknownSetupReg2 = 0xA4,
#define NVREG_UNKSETUP2_VAL     0x16
        NvRegMacAddrA = 0xA8,
        NvRegMacAddrB = 0xAC,
        NvRegMulticastAddrA = 0xB0,
#define NVREG_MCASTADDRA_FORCE  0x01
        NvRegMulticastAddrB = 0xB4,
        NvRegMulticastMaskA = 0xB8,
        NvRegMulticastMaskB = 0xBC,

        NvRegPhyInterface = 0xC0,
#define PHY_RGMII               0x10000000

        NvRegTxRingPhysAddr = 0x100,
        NvRegRxRingPhysAddr = 0x104,
        NvRegRingSizes = 0x108,
#define NVREG_RINGSZ_TXSHIFT 0
#define NVREG_RINGSZ_RXSHIFT 16
        NvRegUnknownTransmitterReg = 0x10c,
        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)
        NvRegUnknownSetupReg3 = 0x13c,
#define NVREG_UNKSETUP3_VAL1    0x200010
        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    0x02100
#define NVREG_TXRXCTL_DESC_3    0x02200
        NvRegMIIStatus = 0x180,
#define NVREG_MIISTAT_ERROR             0x0001
#define NVREG_MIISTAT_LINKCHANGE        0x0008
#define NVREG_MIISTAT_MASK              0x000f
#define NVREG_MIISTAT_MASK2             0x000f
        NvRegUnknownSetupReg4 = 0x184,
#define NVREG_UNKSETUP4_VAL     8

        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,
        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

        NvRegPatternCRC = 0x204,
        NvRegPatternMask = 0x208,
        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
};

/* Big endian: should work, but is untested */
struct ring_desc {
        u32 PacketBuffer;
        u32 FlagLen;
};

struct ring_desc_ex {
        u32 PacketBufferHigh;
        u32 PacketBufferLow;
        u32 Reserved;
        u32 FlagLen;
};

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

#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_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_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_CHECKSUM_L3      (1<<27)
#define NV_TX2_CHECKSUM_L4      (1<<26)

#define NV_RX_DESCRIPTORVALID   (1<<16)
#define NV_RX_MISSEDFRAME       (1<<17)
#define NV_RX_SUBSTRACT1        (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_RX2_CHECKSUMMASK     (0x1C000000)
#define NV_RX2_CHECKSUMOK1      (0x10000000)
#define NV_RX2_CHECKSUMOK2      (0x14000000)
#define NV_RX2_CHECKSUMOK3      (0x18000000)
#define NV_RX2_DESCRIPTORVALID  (1<<29)
#define NV_RX2_SUBSTRACT1       (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)

/* Miscelaneous hardware related defines: */
#define NV_PCI_REGSZ            0x270

/* 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_WAKEUPPATTERNS       5
#define NV_WAKEUPMASKENTRIES    4

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

#define RX_RING         128
#define TX_RING         64
/* 
 * If your nic mysteriously hangs then try to reduce the limits
 * to 1/0: It might be required to set NV_TX_LASTPACKET in the
 * last valid ring entry. But this would be impossible to
 * implement - probably a disassembly error.
 */
#define TX_LIMIT_STOP   63
#define TX_LIMIT_START  62

/* 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)

/* 
 * 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 PHYID1_OUI_MASK 0x03ff
#define PHYID1_OUI_SHFT 6
#define PHYID2_OUI_MASK 0xfc00
#define PHYID2_OUI_SHFT 10
#define PHY_INIT1       0x0f000
#define PHY_INIT2       0x0e00
#define PHY_INIT3       0x01000
#define PHY_INIT4       0x0200
#define PHY_INIT5       0x0004
#define PHY_INIT6       0x02000
#define PHY_GIGABIT     0x0100

#define PHY_TIMEOUT     0x1
#define PHY_ERROR       0x2

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

/* FIXME: MII defines that should be added to <linux/mii.h> */
#define MII_1000BT_CR   0x09
#define MII_1000BT_SR   0x0a
#define ADVERTISE_1000FULL      0x0200
#define ADVERTISE_1000HALF      0x0100
#define LPA_1000FULL    0x0800
#define LPA_1000HALF    0x0400


/*
 * SMP locking:
 * All hardware access under dev->priv->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 dev->xmit_lock. Actual submission
 *      needs dev->priv->lock :-(
 * - set_multicast_list: preparation lockless, relies on dev->xmit_lock.
 */

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

        /* General data:
         * Locking: spin_lock(&np->lock); */
        struct net_device_stats stats;
        int in_shutdown;
        u32 linkspeed;
        int duplex;
        int autoneg;
        int fixed_mode;
        int phyaddr;
        int wolenabled;
        unsigned int phy_oui;
        u16 gigabit;

        /* General data: RO fields */
        dma_addr_t ring_addr;
        struct pci_dev *pci_dev;
        u32 orig_mac[2];
        u32 irqmask;
        u32 desc_ver;
        u32 txrxctl_bits;

        void __iomem *base;

        /* rx specific fields.
         * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
         */
        ring_type rx_ring;
        unsigned int cur_rx, refill_rx;
        struct sk_buff *rx_skbuff[RX_RING];
        dma_addr_t rx_dma[RX_RING];
        unsigned int rx_buf_sz;
        unsigned int pkt_limit;
        struct timer_list oom_kick;
        struct timer_list nic_poll;

        /* media detection workaround.
         * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
         */
        int need_linktimer;
        unsigned long link_timeout;
        /*
         * tx specific fields.
         */
        ring_type tx_ring;
        unsigned int next_tx, nic_tx;
        struct sk_buff *tx_skbuff[TX_RING];
        dma_addr_t tx_dma[TX_RING];
        u32 tx_flags;
};

/*
 * 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 = 5;

/*
 * 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.
 */
#define NV_OPTIMIZATION_MODE_THROUGHPUT 0
#define NV_OPTIMIZATION_MODE_CPU        1
static int optimization_mode = NV_OPTIMIZATION_MODE_THROUGHPUT;

/*
 * 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;

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

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

#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, 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, NULL)) {
                dprintk(KERN_DEBUG "%s: mii_rw of reg %d at PHY %d timed out.\n",
                                dev->name, miireg, addr);
                retval = -1;
        } else if (value != MII_READ) {
                /* it was a write operation - fewer failures are detectable */
                dprintk(KERN_DEBUG "%s: mii_rw wrote 0x%x to reg %d at PHY %d\n",
                                dev->name, value, miireg, addr);
                retval = 0;
        } else if (readl(base + NvRegMIIStatus) & NVREG_MIISTAT_ERROR) {
                dprintk(KERN_DEBUG "%s: mii_rw of reg %d at PHY %d failed.\n",
                                dev->name, miireg, addr);
                retval = -1;
        } else {
                retval = readl(base + NvRegMIIData);
                dprintk(KERN_DEBUG "%s: mii_rw read from reg %d at PHY %d: 0x%x.\n",
                                dev->name, miireg, addr, retval);
        }

        return retval;
}

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

        miicontrol = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
        miicontrol |= BMCR_RESET;
        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) {
                msleep(10);
                miicontrol = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
                /* FIXME: 100 tries seem excessive */
                if (tries++ > 100)
                        return -1;
        }
        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, phy_reserved, mii_status, mii_control, mii_control_1000,reg;

        /* set advertise register */
        reg = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
        reg |= (ADVERTISE_10HALF|ADVERTISE_10FULL|ADVERTISE_100HALF|ADVERTISE_100FULL|0x800|0x400);
        if (mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg)) {
                printk(KERN_INFO "%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_1000BT_CR, 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_1000BT_CR, mii_control_1000)) {
                        printk(KERN_INFO "%s: phy init failed.\n", pci_name(np->pci_dev));
                        return PHY_ERROR;
                }
        }
        else
                np->gigabit = 0;

        /* reset the phy */
        if (phy_reset(dev)) {
                printk(KERN_INFO "%s: phy reset failed\n", pci_name(np->pci_dev));
                return PHY_ERROR;
        }

        /* phy vendor specific configuration */
        if ((np->phy_oui == PHY_OUI_CICADA) && (phyinterface & PHY_RGMII) ) {
                phy_reserved = mii_rw(dev, np->phyaddr, MII_RESV1, MII_READ);
                phy_reserved &= ~(PHY_INIT1 | PHY_INIT2);
                phy_reserved |= (PHY_INIT3 | PHY_INIT4);
                if (mii_rw(dev, np->phyaddr, MII_RESV1, phy_reserved)) {
                        printk(KERN_INFO "%s: phy init failed.\n", pci_name(np->pci_dev));
                        return PHY_ERROR;
                }
                phy_reserved = mii_rw(dev, np->phyaddr, MII_NCONFIG, MII_READ);
                phy_reserved |= PHY_INIT5;
                if (mii_rw(dev, np->phyaddr, MII_NCONFIG, phy_reserved)) {
                        printk(KERN_INFO "%s: phy init failed.\n", pci_name(np->pci_dev));
                        return PHY_ERROR;
                }
        }
        if (np->phy_oui == PHY_OUI_CICADA) {
                phy_reserved = mii_rw(dev, np->phyaddr, MII_SREVISION, MII_READ);
                phy_reserved |= PHY_INIT6;
                if (mii_rw(dev, np->phyaddr, MII_SREVISION, phy_reserved)) {
                        printk(KERN_INFO "%s: phy init failed.\n", pci_name(np->pci_dev));
                        return PHY_ERROR;
                }
        }

        /* restart auto negotiation */
        mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
        mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE);
        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);

        dprintk(KERN_DEBUG "%s: nv_start_rx\n", dev->name);
        /* Already running? Stop it. */
        if (readl(base + NvRegReceiverControl) & NVREG_RCVCTL_START) {
                writel(0, base + NvRegReceiverControl);
                pci_push(base);
        }
        writel(np->linkspeed, base + NvRegLinkSpeed);
        pci_push(base);
        writel(NVREG_RCVCTL_START, base + NvRegReceiverControl);
        dprintk(KERN_DEBUG "%s: nv_start_rx to duplex %d, speed 0x%08x.\n",
                                dev->name, np->duplex, np->linkspeed);
        pci_push(base);
}

static void nv_stop_rx(struct net_device *dev)
{
        u8 __iomem *base = get_hwbase(dev);

        dprintk(KERN_DEBUG "%s: nv_stop_rx\n", dev->name);
        writel(0, base + NvRegReceiverControl);
        reg_delay(dev, NvRegReceiverStatus, NVREG_RCVSTAT_BUSY, 0,
                        NV_RXSTOP_DELAY1, NV_RXSTOP_DELAY1MAX,
                        KERN_INFO "nv_stop_rx: ReceiverStatus remained busy");

        udelay(NV_RXSTOP_DELAY2);
        writel(0, base + NvRegLinkSpeed);
}

static void nv_start_tx(struct net_device *dev)
{
        u8 __iomem *base = get_hwbase(dev);

        dprintk(KERN_DEBUG "%s: nv_start_tx\n", dev->name);
        writel(NVREG_XMITCTL_START, base + NvRegTransmitterControl);
        pci_push(base);
}

static void nv_stop_tx(struct net_device *dev)
{
        u8 __iomem *base = get_hwbase(dev);

        dprintk(KERN_DEBUG "%s: nv_stop_tx\n", dev->name);
        writel(0, base + NvRegTransmitterControl);
        reg_delay(dev, NvRegTransmitterStatus, NVREG_XMITSTAT_BUSY, 0,
                        NV_TXSTOP_DELAY1, NV_TXSTOP_DELAY1MAX,
                        KERN_INFO "nv_stop_tx: TransmitterStatus remained busy");

        udelay(NV_TXSTOP_DELAY2);
        writel(0, base + NvRegUnknownTransmitterReg);
}

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

        dprintk(KERN_DEBUG "%s: nv_txrx_reset\n", dev->name);
        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);
}

/*
 * nv_get_stats: dev->get_stats function
 * Get latest stats value from the nic.
 * Called with read_lock(&dev_base_lock) held for read -
 * only synchronized against unregister_netdevice.
 */
static struct net_device_stats *nv_get_stats(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);

        /* It seems that the nic always generates interrupts and doesn't
         * accumulate errors internally. Thus the current values in np->stats
         * are already up to date.
         */
        return &np->stats;
}

/*
 * 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);
        unsigned int refill_rx = np->refill_rx;
        int nr;

        while (np->cur_rx != refill_rx) {
                struct sk_buff *skb;

                nr = refill_rx % RX_RING;
                if (np->rx_skbuff[nr] == NULL) {

                        skb = dev_alloc_skb(np->rx_buf_sz + NV_RX_ALLOC_PAD);
                        if (!skb)
                                break;

                        skb->dev = dev;
                        np->rx_skbuff[nr] = skb;
                } else {
                        skb = np->rx_skbuff[nr];
                }
                np->rx_dma[nr] = pci_map_single(np->pci_dev, skb->data,
                                        skb->end-skb->data, PCI_DMA_FROMDEVICE);
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                        np->rx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->rx_dma[nr]);
                        wmb();
                        np->rx_ring.orig[nr].FlagLen = cpu_to_le32(np->rx_buf_sz | NV_RX_AVAIL);
                } else {
                        np->rx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->rx_dma[nr]) >> 32;
                        np->rx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->rx_dma[nr]) & 0x0FFFFFFFF;
                        wmb();
                        np->rx_ring.ex[nr].FlagLen = cpu_to_le32(np->rx_buf_sz | NV_RX2_AVAIL);
                }
                dprintk(KERN_DEBUG "%s: nv_alloc_rx: Packet %d marked as Available\n",
                                        dev->name, refill_rx);
                refill_rx++;
        }
        np->refill_rx = refill_rx;
        if (np->cur_rx - refill_rx == RX_RING)
                return 1;
        return 0;
}

static void nv_do_rx_refill(unsigned long data)
{
        struct net_device *dev = (struct net_device *) data;
        struct fe_priv *np = netdev_priv(dev);

        disable_irq(dev->irq);
        if (nv_alloc_rx(dev)) {
                spin_lock(&np->lock);
                if (!np->in_shutdown)
                        mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
                spin_unlock(&np->lock);
        }
        enable_irq(dev->irq);
}

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

        np->cur_rx = RX_RING;
        np->refill_rx = 0;
        for (i = 0; i < RX_RING; i++)
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        np->rx_ring.orig[i].FlagLen = 0;
                else
                        np->rx_ring.ex[i].FlagLen = 0;
}

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

        np->next_tx = np->nic_tx = 0;
        for (i = 0; i < TX_RING; i++) {
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        np->tx_ring.orig[i].FlagLen = 0;
                else
                        np->tx_ring.ex[i].FlagLen = 0;
                np->tx_skbuff[i] = NULL;
        }
}

static int nv_init_ring(struct net_device *dev)
{
        nv_init_tx(dev);
        nv_init_rx(dev);
        return nv_alloc_rx(dev);
}

static void nv_release_txskb(struct net_device *dev, unsigned int skbnr)
{
        struct fe_priv *np = netdev_priv(dev);
        struct sk_buff *skb = np->tx_skbuff[skbnr];
        unsigned int j, entry, fragments;
                        
        dprintk(KERN_INFO "%s: nv_release_txskb for skbnr %d, skb %p\n",
                dev->name, skbnr, np->tx_skbuff[skbnr]);
        
        entry = skbnr;
        if ((fragments = skb_shinfo(skb)->nr_frags) != 0) {
                for (j = fragments; j >= 1; j--) {
                        skb_frag_t *frag = &skb_shinfo(skb)->frags[j-1];
                        pci_unmap_page(np->pci_dev, np->tx_dma[entry],
                                       frag->size,
                                       PCI_DMA_TODEVICE);
                        entry = (entry - 1) % TX_RING;
                }
        }
        pci_unmap_single(np->pci_dev, np->tx_dma[entry],
                         skb->len - skb->data_len,
                         PCI_DMA_TODEVICE);
        dev_kfree_skb_irq(skb);
        np->tx_skbuff[skbnr] = NULL;
}

static void nv_drain_tx(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        unsigned int i;
        
        for (i = 0; i < TX_RING; i++) {
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        np->tx_ring.orig[i].FlagLen = 0;
                else
                        np->tx_ring.ex[i].FlagLen = 0;
                if (np->tx_skbuff[i]) {
                        nv_release_txskb(dev, i);
                        np->stats.tx_dropped++;
                }
        }
}

static void nv_drain_rx(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        int i;
        for (i = 0; i < RX_RING; i++) {
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        np->rx_ring.orig[i].FlagLen = 0;
                else
                        np->rx_ring.ex[i].FlagLen = 0;
                wmb();
                if (np->rx_skbuff[i]) {
                        pci_unmap_single(np->pci_dev, np->rx_dma[i],
                                                np->rx_skbuff[i]->end-np->rx_skbuff[i]->data,
                                                PCI_DMA_FROMDEVICE);
                        dev_kfree_skb(np->rx_skbuff[i]);
                        np->rx_skbuff[i] = NULL;
                }
        }
}

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

/*
 * nv_start_xmit: dev->hard_start_xmit function
 * Called with dev->xmit_lock held.
 */
static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        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 nr = (np->next_tx + fragments) % TX_RING;
        unsigned int i;

        spin_lock_irq(&np->lock);

        if ((np->next_tx - np->nic_tx + fragments) > TX_LIMIT_STOP) {
                spin_unlock_irq(&np->lock);
                netif_stop_queue(dev);
                return NETDEV_TX_BUSY;
        }

        np->tx_skbuff[nr] = skb;
        
        if (fragments) {
                dprintk(KERN_DEBUG "%s: nv_start_xmit: buffer contains %d fragments\n", dev->name, fragments);
                /* setup descriptors in reverse order */
                for (i = fragments; i >= 1; i--) {
                        skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1];
                        np->tx_dma[nr] = pci_map_page(np->pci_dev, frag->page, frag->page_offset, frag->size,
                                                        PCI_DMA_TODEVICE);

                        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                                np->tx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->tx_dma[nr]);
                                np->tx_ring.orig[nr].FlagLen = cpu_to_le32( (frag->size-1) | np->tx_flags | tx_flags_extra);
                        } else {
                                np->tx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->tx_dma[nr]) >> 32;
                                np->tx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->tx_dma[nr]) & 0x0FFFFFFFF;
                                np->tx_ring.ex[nr].FlagLen = cpu_to_le32( (frag->size-1) | np->tx_flags | tx_flags_extra);
                        }
                        
                        nr = (nr - 1) % TX_RING;

                        if (np->desc_ver == DESC_VER_1)
                                tx_flags_extra &= ~NV_TX_LASTPACKET;
                        else
                                tx_flags_extra &= ~NV_TX2_LASTPACKET;           
                }
        }

#ifdef NETIF_F_TSO
        if (skb_shinfo(skb)->tso_size)
                tx_flags_extra |= NV_TX2_TSO | (skb_shinfo(skb)->tso_size << NV_TX2_TSO_SHIFT);
        else
#endif
        tx_flags_extra |= (skb->ip_summed == CHECKSUM_HW ? (NV_TX2_CHECKSUM_L3|NV_TX2_CHECKSUM_L4) : 0);

        np->tx_dma[nr] = pci_map_single(np->pci_dev, skb->data, skb->len-skb->data_len,
                                        PCI_DMA_TODEVICE);
        
        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                np->tx_ring.orig[nr].PacketBuffer = cpu_to_le32(np->tx_dma[nr]);
                np->tx_ring.orig[nr].FlagLen = cpu_to_le32( (skb->len-skb->data_len-1) | np->tx_flags | tx_flags_extra);
        } else {
                np->tx_ring.ex[nr].PacketBufferHigh = cpu_to_le64(np->tx_dma[nr]) >> 32;
                np->tx_ring.ex[nr].PacketBufferLow = cpu_to_le64(np->tx_dma[nr]) & 0x0FFFFFFFF;
                np->tx_ring.ex[nr].FlagLen = cpu_to_le32( (skb->len-skb->data_len-1) | np->tx_flags | tx_flags_extra);
        }       

        dprintk(KERN_DEBUG "%s: nv_start_xmit: packet packet %d queued for transmission. tx_flags_extra: %x\n",
                                dev->name, np->next_tx, tx_flags_extra);
        {
                int j;
                for (j=0; j<64; j++) {
                        if ((j%16) == 0)
                                dprintk("\n%03x:", j);
                        dprintk(" %02x", ((unsigned char*)skb->data)[j]);
                }
                dprintk("\n");
        }

        np->next_tx += 1 + fragments;

        dev->trans_start = jiffies;
        spin_unlock_irq(&np->lock);
        writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
        pci_push(get_hwbase(dev));
        return NETDEV_TX_OK;
}

/*
 * nv_tx_done: check for completed packets, release the skbs.
 *
 * Caller must own np->lock.
 */
static void nv_tx_done(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u32 Flags;
        unsigned int i;
        struct sk_buff *skb;

        while (np->nic_tx != np->next_tx) {
                i = np->nic_tx % TX_RING;

                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        Flags = le32_to_cpu(np->tx_ring.orig[i].FlagLen);
                else
                        Flags = le32_to_cpu(np->tx_ring.ex[i].FlagLen);

                dprintk(KERN_DEBUG "%s: nv_tx_done: looking at packet %d, Flags 0x%x.\n",
                                        dev->name, np->nic_tx, Flags);
                if (Flags & NV_TX_VALID)
                        break;
                if (np->desc_ver == DESC_VER_1) {
                        if (Flags & NV_TX_LASTPACKET) {
                                skb = np->tx_skbuff[i];
                                if (Flags & (NV_TX_RETRYERROR|NV_TX_CARRIERLOST|NV_TX_LATECOLLISION|
                                             NV_TX_UNDERFLOW|NV_TX_ERROR)) {
                                        if (Flags & NV_TX_UNDERFLOW)
                                                np->stats.tx_fifo_errors++;
                                        if (Flags & NV_TX_CARRIERLOST)
                                                np->stats.tx_carrier_errors++;
                                        np->stats.tx_errors++;
                                } else {
                                        np->stats.tx_packets++;
                                        np->stats.tx_bytes += skb->len;
                                }
                                nv_release_txskb(dev, i);
                        }
                } else {
                        if (Flags & NV_TX2_LASTPACKET) {
                                skb = np->tx_skbuff[i];
                                if (Flags & (NV_TX2_RETRYERROR|NV_TX2_CARRIERLOST|NV_TX2_LATECOLLISION|
                                             NV_TX2_UNDERFLOW|NV_TX2_ERROR)) {
                                        if (Flags & NV_TX2_UNDERFLOW)
                                                np->stats.tx_fifo_errors++;
                                        if (Flags & NV_TX2_CARRIERLOST)
                                                np->stats.tx_carrier_errors++;
                                        np->stats.tx_errors++;
                                } else {
                                        np->stats.tx_packets++;
                                        np->stats.tx_bytes += skb->len;
                                }                               
                                nv_release_txskb(dev, i);
                        }
                }
                np->nic_tx++;
        }
        if (np->next_tx - np->nic_tx < TX_LIMIT_START)
                netif_wake_queue(dev);
}

/*
 * nv_tx_timeout: dev->tx_timeout function
 * Called with dev->xmit_lock held.
 */
static void nv_tx_timeout(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);

        printk(KERN_INFO "%s: Got tx_timeout. irq: %08x\n", dev->name,
                        readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK);

        {
                int i;

                printk(KERN_INFO "%s: Ring at %lx: next %d nic %d\n",
                                dev->name, (unsigned long)np->ring_addr,
                                np->next_tx, np->nic_tx);
                printk(KERN_INFO "%s: Dumping tx registers\n", dev->name);
                for (i=0;i<0x400;i+= 32) {
                        printk(KERN_INFO "%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));
                }
                printk(KERN_INFO "%s: Dumping tx ring\n", dev->name);
                for (i=0;i<TX_RING;i+= 4) {
                        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                                printk(KERN_INFO "%03x: %08x %08x // %08x %08x // %08x %08x // %08x %08x\n",
                                       i, 
                                       le32_to_cpu(np->tx_ring.orig[i].PacketBuffer),
                                       le32_to_cpu(np->tx_ring.orig[i].FlagLen),
                                       le32_to_cpu(np->tx_ring.orig[i+1].PacketBuffer),
                                       le32_to_cpu(np->tx_ring.orig[i+1].FlagLen),
                                       le32_to_cpu(np->tx_ring.orig[i+2].PacketBuffer),
                                       le32_to_cpu(np->tx_ring.orig[i+2].FlagLen),
                                       le32_to_cpu(np->tx_ring.orig[i+3].PacketBuffer),
                                       le32_to_cpu(np->tx_ring.orig[i+3].FlagLen));
                        } else {
                                printk(KERN_INFO "%03x: %08x %08x %08x // %08x %08x %08x // %08x %08x %08x // %08x %08x %08x\n",
                                       i, 
                                       le32_to_cpu(np->tx_ring.ex[i].PacketBufferHigh),
                                       le32_to_cpu(np->tx_ring.ex[i].PacketBufferLow),
                                       le32_to_cpu(np->tx_ring.ex[i].FlagLen),
                                       le32_to_cpu(np->tx_ring.ex[i+1].PacketBufferHigh),
                                       le32_to_cpu(np->tx_ring.ex[i+1].PacketBufferLow),
                                       le32_to_cpu(np->tx_ring.ex[i+1].FlagLen),
                                       le32_to_cpu(np->tx_ring.ex[i+2].PacketBufferHigh),
                                       le32_to_cpu(np->tx_ring.ex[i+2].PacketBufferLow),
                                       le32_to_cpu(np->tx_ring.ex[i+2].FlagLen),
                                       le32_to_cpu(np->tx_ring.ex[i+3].PacketBufferHigh),
                                       le32_to_cpu(np->tx_ring.ex[i+3].PacketBufferLow),
                                       le32_to_cpu(np->tx_ring.ex[i+3].FlagLen));
                        }
                }
        }

        spin_lock_irq(&np->lock);

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

        /* 2) check that the packets were not sent already: */
        nv_tx_done(dev);

        /* 3) if there are dead entries: clear everything */
        if (np->next_tx != np->nic_tx) {
                printk(KERN_DEBUG "%s: tx_timeout: dead entries!\n", dev->name);
                nv_drain_tx(dev);
                np->next_tx = np->nic_tx = 0;
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc)), base + NvRegTxRingPhysAddr);
                else
                        writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc_ex)), base + NvRegTxRingPhysAddr);
                netif_wake_queue(dev);
        }

        /* 4) restart tx engine */
        nv_start_tx(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 == __constant_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;
        }
        dprintk(KERN_DEBUG "%s: nv_getlen: datalen %d, protolen %d, hdrlen %d\n",
                                dev->name, datalen, protolen, hdrlen);
        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.
                         */
                        dprintk(KERN_DEBUG "%s: nv_getlen: accepting %d bytes.\n",
                                        dev->name, protolen);
                        return protolen;
                } else {
                        /* less data on wire than mentioned in header.
                         * Discard the packet.
                         */
                        dprintk(KERN_DEBUG "%s: nv_getlen: discarding long packet.\n",
                                        dev->name);
                        return -1;
                }
        } else {
                /* short packet. Accept only if 802 values are also short */
                if (protolen > ETH_ZLEN) {
                        dprintk(KERN_DEBUG "%s: nv_getlen: discarding short packet.\n",
                                        dev->name);
                        return -1;
                }
                dprintk(KERN_DEBUG "%s: nv_getlen: accepting %d bytes.\n",
                                dev->name, datalen);
                return datalen;
        }
}

static void nv_rx_process(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u32 Flags;

        for (;;) {
                struct sk_buff *skb;
                int len;
                int i;
                if (np->cur_rx - np->refill_rx >= RX_RING)
                        break;  /* we scanned the whole ring - do not continue */

                i = np->cur_rx % RX_RING;
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                        Flags = le32_to_cpu(np->rx_ring.orig[i].FlagLen);
                        len = nv_descr_getlength(&np->rx_ring.orig[i], np->desc_ver);
                } else {
                        Flags = le32_to_cpu(np->rx_ring.ex[i].FlagLen);
                        len = nv_descr_getlength_ex(&np->rx_ring.ex[i], np->desc_ver);
                }

                dprintk(KERN_DEBUG "%s: nv_rx_process: looking at packet %d, Flags 0x%x.\n",
                                        dev->name, np->cur_rx, Flags);

                if (Flags & NV_RX_AVAIL)
                        break;  /* still owned by hardware, */

                /*
                 * 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->rx_dma[i],
                                np->rx_skbuff[i]->end-np->rx_skbuff[i]->data,
                                PCI_DMA_FROMDEVICE);

                {
                        int j;
                        dprintk(KERN_DEBUG "Dumping packet (flags 0x%x).",Flags);
                        for (j=0; j<64; j++) {
                                if ((j%16) == 0)
                                        dprintk("\n%03x:", j);
                                dprintk(" %02x", ((unsigned char*)np->rx_skbuff[i]->data)[j]);
                        }
                        dprintk("\n");
                }
                /* look at what we actually got: */
                if (np->desc_ver == DESC_VER_1) {
                        if (!(Flags & NV_RX_DESCRIPTORVALID))
                                goto next_pkt;

                        if (Flags & NV_RX_ERROR) {
                                if (Flags & NV_RX_MISSEDFRAME) {
                                        np->stats.rx_missed_errors++;
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & (NV_RX_ERROR1|NV_RX_ERROR2|NV_RX_ERROR3)) {
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX_CRCERR) {
                                        np->stats.rx_crc_errors++;
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX_OVERFLOW) {
                                        np->stats.rx_over_errors++;
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX_ERROR4) {
                                        len = nv_getlen(dev, np->rx_skbuff[i]->data, len);
                                        if (len < 0) {
                                                np->stats.rx_errors++;
                                                goto next_pkt;
                                        }
                                }
                                /* framing errors are soft errors. */
                                if (Flags & NV_RX_FRAMINGERR) {
                                        if (Flags & NV_RX_SUBSTRACT1) {
                                                len--;
                                        }
                                }
                        }
                } else {
                        if (!(Flags & NV_RX2_DESCRIPTORVALID))
                                goto next_pkt;

                        if (Flags & NV_RX2_ERROR) {
                                if (Flags & (NV_RX2_ERROR1|NV_RX2_ERROR2|NV_RX2_ERROR3)) {
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX2_CRCERR) {
                                        np->stats.rx_crc_errors++;
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX2_OVERFLOW) {
                                        np->stats.rx_over_errors++;
                                        np->stats.rx_errors++;
                                        goto next_pkt;
                                }
                                if (Flags & NV_RX2_ERROR4) {
                                        len = nv_getlen(dev, np->rx_skbuff[i]->data, len);
                                        if (len < 0) {
                                                np->stats.rx_errors++;
                                                goto next_pkt;
                                        }
                                }
                                /* framing errors are soft errors */
                                if (Flags & NV_RX2_FRAMINGERR) {
                                        if (Flags & NV_RX2_SUBSTRACT1) {
                                                len--;
                                        }
                                }
                        }
                        Flags &= NV_RX2_CHECKSUMMASK;
                        if (Flags == NV_RX2_CHECKSUMOK1 ||
                                        Flags == NV_RX2_CHECKSUMOK2 ||
                                        Flags == NV_RX2_CHECKSUMOK3) {
                                dprintk(KERN_DEBUG "%s: hw checksum hit!.\n", dev->name);
                                np->rx_skbuff[i]->ip_summed = CHECKSUM_UNNECESSARY;
                        } else {
                                dprintk(KERN_DEBUG "%s: hwchecksum miss!.\n", dev->name);
                        }
                }
                /* got a valid packet - forward it to the network core */
                skb = np->rx_skbuff[i];
                np->rx_skbuff[i] = NULL;

                skb_put(skb, len);
                skb->protocol = eth_type_trans(skb, dev);
                dprintk(KERN_DEBUG "%s: nv_rx_process: packet %d with %d bytes, proto %d accepted.\n",
                                        dev->name, np->cur_rx, len, skb->protocol);
                netif_rx(skb);
                dev->last_rx = jiffies;
                np->stats.rx_packets++;
                np->stats.rx_bytes += len;
next_pkt:
                np->cur_rx++;
        }
}

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

        if (dev->mtu <= ETH_DATA_LEN)
                np->rx_buf_sz = ETH_DATA_LEN + NV_RX_HEADERS;
        else
                np->rx_buf_sz = dev->mtu + NV_RX_HEADERS;
}

/*
 * nv_change_mtu: dev->change_mtu function
 * Called with dev_base_lock held for read.
 */
static int nv_change_mtu(struct net_device *dev, int new_mtu)
{
        struct fe_priv *np = netdev_priv(dev);
        int old_mtu;

        if (new_mtu < 64 || new_mtu > np->pkt_limit)
                return -EINVAL;

        old_mtu = dev->mtu;
        dev->mtu = new_mtu;

        /* return early if the buffer sizes will not change */
        if (old_mtu <= ETH_DATA_LEN && new_mtu <= ETH_DATA_LEN)
                return 0;
        if (old_mtu == new_mtu)
                return 0;

        /* synchronized against open : rtnl_lock() held by caller */
        if (netif_running(dev)) {
                u8 __iomem *base = get_hwbase(dev);
                /*
                 * It seems that the nic preloads valid ring entries into an
                 * internal buffer. The procedure for flushing everything is
                 * guessed, there is probably a simpler approach.
                 * Changing the MTU is a rare event, it shouldn't matter.
                 */
                disable_irq(dev->irq);
                spin_lock_bh(&dev->xmit_lock);
                spin_lock(&np->lock);
                /* stop engines */
                nv_stop_rx(dev);
                nv_stop_tx(dev);
                nv_txrx_reset(dev);
                /* drain rx queue */
                nv_drain_rx(dev);
                nv_drain_tx(dev);
                /* reinit driver view of the rx queue */
                nv_init_rx(dev);
                nv_init_tx(dev);
                /* alloc new rx buffers */
                set_bufsize(dev);
                if (nv_alloc_rx(dev)) {
                        if (!np->in_shutdown)
                                mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
                }
                /* reinit nic view of the rx queue */
                writel(np->rx_buf_sz, base + NvRegOffloadConfig);
                writel((u32) np->ring_addr, base + NvRegRxRingPhysAddr);
                if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                        writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc)), base + NvRegTxRingPhysAddr);
                else
                        writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc_ex)), base + NvRegTxRingPhysAddr);
                writel( ((RX_RING-1) << NVREG_RINGSZ_RXSHIFT) + ((TX_RING-1) << NVREG_RINGSZ_TXSHIFT),
                        base + NvRegRingSizes);
                pci_push(base);
                writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
                pci_push(base);

                /* restart rx engine */
                nv_start_rx(dev);
                nv_start_tx(dev);
                spin_unlock(&np->lock);
                spin_unlock_bh(&dev->xmit_lock);
                enable_irq(dev->irq);
        }
        return 0;
}

static void nv_copy_mac_to_hw(struct net_device *dev)
{
        u8 __iomem *base = get_hwbase(dev);
        u32 mac[2];

        mac[0] = (dev->dev_addr[0] << 0) + (dev->dev_addr[1] << 8) +
                        (dev->dev_addr[2] << 16) + (dev->dev_addr[3] << 24);
        mac[1] = (dev->dev_addr[4] << 0) + (dev->dev_addr[5] << 8);

        writel(mac[0], base + NvRegMacAddrA);
        writel(mac[1], base + NvRegMacAddrB);
}

/*
 * nv_set_mac_address: dev->set_mac_address function
 * Called with rtnl_lock() held.
 */
static int nv_set_mac_address(struct net_device *dev, void *addr)
{
        struct fe_priv *np = netdev_priv(dev);
        struct sockaddr *macaddr = (struct sockaddr*)addr;

        if(!is_valid_ether_addr(macaddr->sa_data))
                return -EADDRNOTAVAIL;

        /* synchronized against open : rtnl_lock() held by caller */
        memcpy(dev->dev_addr, macaddr->sa_data, ETH_ALEN);

        if (netif_running(dev)) {
                spin_lock_bh(&dev->xmit_lock);
                spin_lock_irq(&np->lock);

                /* stop rx engine */
                nv_stop_rx(dev);

                /* set mac address */
                nv_copy_mac_to_hw(dev);

                /* restart rx engine */
                nv_start_rx(dev);
                spin_unlock_irq(&np->lock);
                spin_unlock_bh(&dev->xmit_lock);
        } else {
                nv_copy_mac_to_hw(dev);
        }
        return 0;
}

/*
 * nv_set_multicast: dev->set_multicast function
 * Called with dev->xmit_lock held.
 */
static void nv_set_multicast(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        u32 addr[2];
        u32 mask[2];
        u32 pff;

        memset(addr, 0, sizeof(addr));
        memset(mask, 0, sizeof(mask));

        if (dev->flags & IFF_PROMISC) {
                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
                pff = NVREG_PFF_PROMISC;
        } else {
                pff = NVREG_PFF_MYADDR;

                if (dev->flags & IFF_ALLMULTI || dev->mc_list) {
                        u32 alwaysOff[2];
                        u32 alwaysOn[2];

                        alwaysOn[0] = alwaysOn[1] = alwaysOff[0] = alwaysOff[1] = 0xffffffff;
                        if (dev->flags & IFF_ALLMULTI) {
                                alwaysOn[0] = alwaysOn[1] = alwaysOff[0] = alwaysOff[1] = 0;
                        } else {
                                struct dev_mc_list *walk;

                                walk = dev->mc_list;
                                while (walk != NULL) {
                                        u32 a, b;
                                        a = le32_to_cpu(*(u32 *) walk->dmi_addr);
                                        b = le16_to_cpu(*(u16 *) (&walk->dmi_addr[4]));
                                        alwaysOn[0] &= a;
                                        alwaysOff[0] &= ~a;
                                        alwaysOn[1] &= b;
                                        alwaysOff[1] &= ~b;
                                        walk = walk->next;
                                }
                        }
                        addr[0] = alwaysOn[0];
                        addr[1] = alwaysOn[1];
                        mask[0] = alwaysOn[0] | alwaysOff[0];
                        mask[1] = alwaysOn[1] | alwaysOff[1];
                }
        }
        addr[0] |= NVREG_MCASTADDRA_FORCE;
        pff |= NVREG_PFF_ALWAYS;
        spin_lock_irq(&np->lock);
        nv_stop_rx(dev);
        writel(addr[0], base + NvRegMulticastAddrA);
        writel(addr[1], base + NvRegMulticastAddrB);
        writel(mask[0], base + NvRegMulticastMaskA);
        writel(mask[1], base + NvRegMulticastMaskB);
        writel(pff, base + NvRegPacketFilterFlags);
        dprintk(KERN_INFO "%s: reconfiguration for multicast lists.\n",
                dev->name);
        nv_start_rx(dev);
        spin_unlock_irq(&np->lock);
}

/**
 * nv_update_linkspeed: Setup the MAC according to the link partner
 * @dev: Network device to be configured
 *
 * The function queries the PHY and checks if there is a link partner.
 * If yes, then it sets up the MAC accordingly. Otherwise, the MAC is
 * set to 10 MBit HD.
 *
 * The function returns 0 if there is no link partner and 1 if there is
 * a good link partner.
 */
static int nv_update_linkspeed(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        int adv, lpa;
        int newls = np->linkspeed;
        int newdup = np->duplex;
        int mii_status;
        int retval = 0;
        u32 control_1000, status_1000, phyreg;

        /* BMSR_LSTATUS is latched, read it twice:
         * we want the current value.
         */
        mii_rw(dev, np->phyaddr, MII_BMSR, MII_READ);
        mii_status = mii_rw(dev, np->phyaddr, MII_BMSR, MII_READ);

        if (!(mii_status & BMSR_LSTATUS)) {
                dprintk(KERN_DEBUG "%s: no link detected by phy - falling back to 10HD.\n",
                                dev->name);
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                newdup = 0;
                retval = 0;
                goto set_speed;
        }

        if (np->autoneg == 0) {
                dprintk(KERN_DEBUG "%s: nv_update_linkspeed: autoneg off, PHY set to 0x%04x.\n",
                                dev->name, np->fixed_mode);
                if (np->fixed_mode & LPA_100FULL) {
                        newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_100;
                        newdup = 1;
                } else if (np->fixed_mode & LPA_100HALF) {
                        newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_100;
                        newdup = 0;
                } else if (np->fixed_mode & LPA_10FULL) {
                        newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                        newdup = 1;
                } else {
                        newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                        newdup = 0;
                }
                retval = 1;
                goto set_speed;
        }
        /* check auto negotiation is complete */
        if (!(mii_status & BMSR_ANEGCOMPLETE)) {
                /* still in autonegotiation - configure nic for 10 MBit HD and wait. */
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                newdup = 0;
                retval = 0;
                dprintk(KERN_DEBUG "%s: autoneg not completed - falling back to 10HD.\n", dev->name);
                goto set_speed;
        }

        retval = 1;
        if (np->gigabit == PHY_GIGABIT) {
                control_1000 = mii_rw(dev, np->phyaddr, MII_1000BT_CR, MII_READ);
                status_1000 = mii_rw(dev, np->phyaddr, MII_1000BT_SR, MII_READ);

                if ((control_1000 & ADVERTISE_1000FULL) &&
                        (status_1000 & LPA_1000FULL)) {
                        dprintk(KERN_DEBUG "%s: nv_update_linkspeed: GBit ethernet detected.\n",
                                dev->name);
                        newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_1000;
                        newdup = 1;
                        goto set_speed;
                }
        }

        adv = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
        lpa = mii_rw(dev, np->phyaddr, MII_LPA, MII_READ);
        dprintk(KERN_DEBUG "%s: nv_update_linkspeed: PHY advertises 0x%04x, lpa 0x%04x.\n",
                                dev->name, adv, lpa);

        /* FIXME: handle parallel detection properly */
        lpa = lpa & adv;
        if (lpa & LPA_100FULL) {
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_100;
                newdup = 1;
        } else if (lpa & LPA_100HALF) {
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_100;
                newdup = 0;
        } else if (lpa & LPA_10FULL) {
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                newdup = 1;
        } else if (lpa & LPA_10HALF) {
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                newdup = 0;
        } else {
                dprintk(KERN_DEBUG "%s: bad ability %04x - falling back to 10HD.\n", dev->name, lpa);
                newls = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
                newdup = 0;
        }

set_speed:
        if (np->duplex == newdup && np->linkspeed == newls)
                return retval;

        dprintk(KERN_INFO "%s: changing link setting from %d/%d to %d/%d.\n",
                        dev->name, np->linkspeed, np->duplex, newls, newdup);

        np->duplex = newdup;
        np->linkspeed = newls;

        if (np->gigabit == PHY_GIGABIT) {
                phyreg = readl(base + NvRegRandomSeed);
                phyreg &= ~(0x3FF00);
                if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_10)
                        phyreg |= NVREG_RNDSEED_FORCE3;
                else if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_100)
                        phyreg |= NVREG_RNDSEED_FORCE2;
                else if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_1000)
                        phyreg |= NVREG_RNDSEED_FORCE;
                writel(phyreg, base + NvRegRandomSeed);
        }

        phyreg = readl(base + NvRegPhyInterface);
        phyreg &= ~(PHY_HALF|PHY_100|PHY_1000);
        if (np->duplex == 0)
                phyreg |= PHY_HALF;
        if ((np->linkspeed & NVREG_LINKSPEED_MASK) == NVREG_LINKSPEED_100)
                phyreg |= PHY_100;
        else if ((np->linkspeed & NVREG_LINKSPEED_MASK) == NVREG_LINKSPEED_1000)
                phyreg |= PHY_1000;
        writel(phyreg, base + NvRegPhyInterface);

        writel(NVREG_MISC1_FORCE | ( np->duplex ? 0 : NVREG_MISC1_HD),
                base + NvRegMisc1);
        pci_push(base);
        writel(np->linkspeed, base + NvRegLinkSpeed);
        pci_push(base);

        return retval;
}

static void nv_linkchange(struct net_device *dev)
{
        if (nv_update_linkspeed(dev)) {
                if (!netif_carrier_ok(dev)) {
                        netif_carrier_on(dev);
                        printk(KERN_INFO "%s: link up.\n", dev->name);
                        nv_start_rx(dev);
                }
        } else {
                if (netif_carrier_ok(dev)) {
                        netif_carrier_off(dev);
                        printk(KERN_INFO "%s: link down.\n", dev->name);
                        nv_stop_rx(dev);
                }
        }
}

static void nv_link_irq(struct net_device *dev)
{
        u8 __iomem *base = get_hwbase(dev);
        u32 miistat;

        miistat = readl(base + NvRegMIIStatus);
        writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
        dprintk(KERN_INFO "%s: link change irq, status 0x%x.\n", dev->name, miistat);

        if (miistat & (NVREG_MIISTAT_LINKCHANGE))
                nv_linkchange(dev);
        dprintk(KERN_DEBUG "%s: link change notification done.\n", dev->name);
}

static irqreturn_t nv_nic_irq(int foo, void *data, struct pt_regs *regs)
{
        struct net_device *dev = (struct net_device *) data;
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        u32 events;
        int i;

        dprintk(KERN_DEBUG "%s: nv_nic_irq\n", dev->name);

        for (i=0; ; i++) {
                events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
                writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
                pci_push(base);
                dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, events);
                if (!(events & np->irqmask))
                        break;

                spin_lock(&np->lock);
                nv_tx_done(dev);
                spin_unlock(&np->lock);
                
                nv_rx_process(dev);
                if (nv_alloc_rx(dev)) {
                        spin_lock(&np->lock);
                        if (!np->in_shutdown)
                                mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
                        spin_unlock(&np->lock);
                }
                
                if (events & NVREG_IRQ_LINK) {
                        spin_lock(&np->lock);
                        nv_link_irq(dev);
                        spin_unlock(&np->lock);
                }
                if (np->need_linktimer && time_after(jiffies, np->link_timeout)) {
                        spin_lock(&np->lock);
                        nv_linkchange(dev);
                        spin_unlock(&np->lock);
                        np->link_timeout = jiffies + LINK_TIMEOUT;
                }
                if (events & (NVREG_IRQ_TX_ERR)) {
                        dprintk(KERN_DEBUG "%s: received irq with events 0x%x. Probably TX fail.\n",
                                                dev->name, events);
                }
                if (events & (NVREG_IRQ_UNKNOWN)) {
                        printk(KERN_DEBUG "%s: received irq with unknown events 0x%x. Please report\n",
                                                dev->name, events);
                }
                if (i > max_interrupt_work) {
                        spin_lock(&np->lock);
                        /* disable interrupts on the nic */
                        writel(0, base + NvRegIrqMask);
                        pci_push(base);

                        if (!np->in_shutdown)
                                mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
                        printk(KERN_DEBUG "%s: too many iterations (%d) in nv_nic_irq.\n", dev->name, i);
                        spin_unlock(&np->lock);
                        break;
                }

        }
        dprintk(KERN_DEBUG "%s: nv_nic_irq completed\n", dev->name);

        return IRQ_RETVAL(i);
}

static void nv_do_nic_poll(unsigned long data)
{
        struct net_device *dev = (struct net_device *) data;
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);

        disable_irq(dev->irq);
        /* FIXME: Do we need synchronize_irq(dev->irq) here? */
        /*
         * reenable interrupts on the nic, we have to do this before calling
         * nv_nic_irq because that may decide to do otherwise
         */
        writel(np->irqmask, base + NvRegIrqMask);
        pci_push(base);
        nv_nic_irq((int) 0, (void *) data, (struct pt_regs *) NULL);
        enable_irq(dev->irq);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void nv_poll_controller(struct net_device *dev)
{
        nv_do_nic_poll((unsigned long) dev);
}
#endif

static void nv_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
        struct fe_priv *np = netdev_priv(dev);
        strcpy(info->driver, "forcedeth");
        strcpy(info->version, FORCEDETH_VERSION);
        strcpy(info->bus_info, pci_name(np->pci_dev));
}

static void nv_get_wol(struct net_device *dev, struct ethtool_wolinfo *wolinfo)
{
        struct fe_priv *np = netdev_priv(dev);
        wolinfo->supported = WAKE_MAGIC;

        spin_lock_irq(&np->lock);
        if (np->wolenabled)
                wolinfo->wolopts = WAKE_MAGIC;
        spin_unlock_irq(&np->lock);
}

static int nv_set_wol(struct net_device *dev, struct ethtool_wolinfo *wolinfo)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);

        spin_lock_irq(&np->lock);
        if (wolinfo->wolopts == 0) {
                writel(0, base + NvRegWakeUpFlags);
                np->wolenabled = 0;
        }
        if (wolinfo->wolopts & WAKE_MAGIC) {
                writel(NVREG_WAKEUPFLAGS_ENABLE, base + NvRegWakeUpFlags);
                np->wolenabled = 1;
        }
        spin_unlock_irq(&np->lock);
        return 0;
}

static int nv_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct fe_priv *np = netdev_priv(dev);
        int adv;

        spin_lock_irq(&np->lock);
        ecmd->port = PORT_MII;
        if (!netif_running(dev)) {
                /* We do not track link speed / duplex setting if the
                 * interface is disabled. Force a link check */
                nv_update_linkspeed(dev);
        }
        switch(np->linkspeed & (NVREG_LINKSPEED_MASK)) {
                case NVREG_LINKSPEED_10:
                        ecmd->speed = SPEED_10;
                        break;
                case NVREG_LINKSPEED_100:
                        ecmd->speed = SPEED_100;
                        break;
                case NVREG_LINKSPEED_1000:
                        ecmd->speed = SPEED_1000;
                        break;
        }
        ecmd->duplex = DUPLEX_HALF;
        if (np->duplex)
                ecmd->duplex = DUPLEX_FULL;

        ecmd->autoneg = np->autoneg;

        ecmd->advertising = ADVERTISED_MII;
        if (np->autoneg) {
                ecmd->advertising |= ADVERTISED_Autoneg;
                adv = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
        } else {
                adv = np->fixed_mode;
        }
        if (adv & ADVERTISE_10HALF)
                ecmd->advertising |= ADVERTISED_10baseT_Half;
        if (adv & ADVERTISE_10FULL)
                ecmd->advertising |= ADVERTISED_10baseT_Full;
        if (adv & ADVERTISE_100HALF)
                ecmd->advertising |= ADVERTISED_100baseT_Half;
        if (adv & ADVERTISE_100FULL)
                ecmd->advertising |= ADVERTISED_100baseT_Full;
        if (np->autoneg && np->gigabit == PHY_GIGABIT) {
                adv = mii_rw(dev, np->phyaddr, MII_1000BT_CR, MII_READ);
                if (adv & ADVERTISE_1000FULL)
                        ecmd->advertising |= ADVERTISED_1000baseT_Full;
        }

        ecmd->supported = (SUPPORTED_Autoneg |
                SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
                SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
                SUPPORTED_MII);
        if (np->gigabit == PHY_GIGABIT)
                ecmd->supported |= SUPPORTED_1000baseT_Full;

        ecmd->phy_address = np->phyaddr;
        ecmd->transceiver = XCVR_EXTERNAL;

        /* ignore maxtxpkt, maxrxpkt for now */
        spin_unlock_irq(&np->lock);
        return 0;
}

static int nv_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct fe_priv *np = netdev_priv(dev);

        if (ecmd->port != PORT_MII)
                return -EINVAL;
        if (ecmd->transceiver != XCVR_EXTERNAL)
                return -EINVAL;
        if (ecmd->phy_address != np->phyaddr) {
                /* TODO: support switching between multiple phys. Should be
                 * trivial, but not enabled due to lack of test hardware. */
                return -EINVAL;
        }
        if (ecmd->autoneg == AUTONEG_ENABLE) {
                u32 mask;

                mask = ADVERTISED_10baseT_Half | ADVERTISED_10baseT_Full |
                          ADVERTISED_100baseT_Half | ADVERTISED_100baseT_Full;
                if (np->gigabit == PHY_GIGABIT)
                        mask |= ADVERTISED_1000baseT_Full;

                if ((ecmd->advertising & mask) == 0)
                        return -EINVAL;

        } else if (ecmd->autoneg == AUTONEG_DISABLE) {
                /* Note: autonegotiation disable, speed 1000 intentionally
                 * forbidden - noone should need that. */

                if (ecmd->speed != SPEED_10 && ecmd->speed != SPEED_100)
                        return -EINVAL;
                if (ecmd->duplex != DUPLEX_HALF && ecmd->duplex != DUPLEX_FULL)
                        return -EINVAL;
        } else {
                return -EINVAL;
        }

        spin_lock_irq(&np->lock);
        if (ecmd->autoneg == AUTONEG_ENABLE) {
                int adv, bmcr;

                np->autoneg = 1;

                /* advertise only what has been requested */
                adv = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
                adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
                if (ecmd->advertising & ADVERTISED_10baseT_Half)
                        adv |= ADVERTISE_10HALF;
                if (ecmd->advertising & ADVERTISED_10baseT_Full)
                        adv |= ADVERTISE_10FULL;
                if (ecmd->advertising & ADVERTISED_100baseT_Half)
                        adv |= ADVERTISE_100HALF;
                if (ecmd->advertising & ADVERTISED_100baseT_Full)
                        adv |= ADVERTISE_100FULL;
                mii_rw(dev, np->phyaddr, MII_ADVERTISE, adv);

                if (np->gigabit == PHY_GIGABIT) {
                        adv = mii_rw(dev, np->phyaddr, MII_1000BT_CR, MII_READ);
                        adv &= ~ADVERTISE_1000FULL;
                        if (ecmd->advertising & ADVERTISED_1000baseT_Full)
                                adv |= ADVERTISE_1000FULL;
                        mii_rw(dev, np->phyaddr, MII_1000BT_CR, adv);
                }

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

        } else {
                int adv, bmcr;

                np->autoneg = 0;

                adv = mii_rw(dev, np->phyaddr, MII_ADVERTISE, MII_READ);
                adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
                if (ecmd->speed == SPEED_10 && ecmd->duplex == DUPLEX_HALF)
                        adv |= ADVERTISE_10HALF;
                if (ecmd->speed == SPEED_10 && ecmd->duplex == DUPLEX_FULL)
                        adv |= ADVERTISE_10FULL;
                if (ecmd->speed == SPEED_100 && ecmd->duplex == DUPLEX_HALF)
                        adv |= ADVERTISE_100HALF;
                if (ecmd->speed == SPEED_100 && ecmd->duplex == DUPLEX_FULL)
                        adv |= ADVERTISE_100FULL;
                mii_rw(dev, np->phyaddr, MII_ADVERTISE, adv);
                np->fixed_mode = adv;

                if (np->gigabit == PHY_GIGABIT) {
                        adv = mii_rw(dev, np->phyaddr, MII_1000BT_CR, MII_READ);
                        adv &= ~ADVERTISE_1000FULL;
                        mii_rw(dev, np->phyaddr, MII_1000BT_CR, adv);
                }

                bmcr = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
                bmcr |= ~(BMCR_ANENABLE|BMCR_SPEED100|BMCR_FULLDPLX);
                if (adv & (ADVERTISE_10FULL|ADVERTISE_100FULL))
                        bmcr |= BMCR_FULLDPLX;
                if (adv & (ADVERTISE_100HALF|ADVERTISE_100FULL))
                        bmcr |= BMCR_SPEED100;
                mii_rw(dev, np->phyaddr, MII_BMCR, bmcr);

                if (netif_running(dev)) {
                        /* Wait a bit and then reconfigure the nic. */
                        udelay(10);
                        nv_linkchange(dev);
                }
        }
        spin_unlock_irq(&np->lock);

        return 0;
}

#define FORCEDETH_REGS_VER      1
#define FORCEDETH_REGS_SIZE     0x400 /* 256 32-bit registers */

static int nv_get_regs_len(struct net_device *dev)
{
        return FORCEDETH_REGS_SIZE;
}

static void nv_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *buf)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        u32 *rbuf = buf;
        int i;

        regs->version = FORCEDETH_REGS_VER;
        spin_lock_irq(&np->lock);
        for (i=0;i<FORCEDETH_REGS_SIZE/sizeof(u32);i++)
                rbuf[i] = readl(base + i*sizeof(u32));
        spin_unlock_irq(&np->lock);
}

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

        spin_lock_irq(&np->lock);
        if (np->autoneg) {
                int bmcr;

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

                ret = 0;
        } else {
                ret = -EINVAL;
        }
        spin_unlock_irq(&np->lock);

        return ret;
}

static struct ethtool_ops ops = {
        .get_drvinfo = nv_get_drvinfo,
        .get_link = ethtool_op_get_link,
        .get_wol = nv_get_wol,
        .set_wol = nv_set_wol,
        .get_settings = nv_get_settings,
        .set_settings = nv_set_settings,
        .get_regs_len = nv_get_regs_len,
        .get_regs = nv_get_regs,
        .nway_reset = nv_nway_reset,
        .get_perm_addr = ethtool_op_get_perm_addr,
};

static int nv_open(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        int ret, oom, i;

        dprintk(KERN_DEBUG "nv_open: begin\n");

        /* 1) erase previous misconfiguration */
        /* 4.1-1: stop adapter: ignored, 4.3 seems to be overkill */
        writel(NVREG_MCASTADDRA_FORCE, base + NvRegMulticastAddrA);
        writel(0, base + NvRegMulticastAddrB);
        writel(0, base + NvRegMulticastMaskA);
        writel(0, base + NvRegMulticastMaskB);
        writel(0, base + NvRegPacketFilterFlags);

        writel(0, base + NvRegTransmitterControl);
        writel(0, base + NvRegReceiverControl);

        writel(0, base + NvRegAdapterControl);

        /* 2) initialize descriptor rings */
        set_bufsize(dev);
        oom = nv_init_ring(dev);

        writel(0, base + NvRegLinkSpeed);
        writel(0, base + NvRegUnknownTransmitterReg);
        nv_txrx_reset(dev);
        writel(0, base + NvRegUnknownSetupReg6);

        np->in_shutdown = 0;

        /* 3) set mac address */
        nv_copy_mac_to_hw(dev);

        /* 4) give hw rings */
        writel((u32) np->ring_addr, base + NvRegRxRingPhysAddr);
        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc)), base + NvRegTxRingPhysAddr);
        else
                writel((u32) (np->ring_addr + RX_RING*sizeof(struct ring_desc_ex)), base + NvRegTxRingPhysAddr);
        writel( ((RX_RING-1) << NVREG_RINGSZ_RXSHIFT) + ((TX_RING-1) << NVREG_RINGSZ_TXSHIFT),
                base + NvRegRingSizes);

        /* 5) continue setup */
        writel(np->linkspeed, base + NvRegLinkSpeed);
        writel(NVREG_UNKSETUP3_VAL1, base + NvRegUnknownSetupReg3);
        writel(np->txrxctl_bits, base + NvRegTxRxControl);
        pci_push(base);
        writel(NVREG_TXRXCTL_BIT1|np->txrxctl_bits, base + NvRegTxRxControl);
        reg_delay(dev, NvRegUnknownSetupReg5, NVREG_UNKSETUP5_BIT31, NVREG_UNKSETUP5_BIT31,
                        NV_SETUP5_DELAY, NV_SETUP5_DELAYMAX,
                        KERN_INFO "open: SetupReg5, Bit 31 remained off\n");

        writel(0, base + NvRegUnknownSetupReg4);
        writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
        writel(NVREG_MIISTAT_MASK2, base + NvRegMIIStatus);

        /* 6) continue setup */
        writel(NVREG_MISC1_FORCE | NVREG_MISC1_HD, base + NvRegMisc1);
        writel(readl(base + NvRegTransmitterStatus), base + NvRegTransmitterStatus);
        writel(NVREG_PFF_ALWAYS, base + NvRegPacketFilterFlags);
        writel(np->rx_buf_sz, base + NvRegOffloadConfig);

        writel(readl(base + NvRegReceiverStatus), base + NvRegReceiverStatus);
        get_random_bytes(&i, sizeof(i));
        writel(NVREG_RNDSEED_FORCE | (i&NVREG_RNDSEED_MASK), base + NvRegRandomSeed);
        writel(NVREG_UNKSETUP1_VAL, base + NvRegUnknownSetupReg1);
        writel(NVREG_UNKSETUP2_VAL, base + NvRegUnknownSetupReg2);
        if (poll_interval == -1) {
                if (optimization_mode == NV_OPTIMIZATION_MODE_THROUGHPUT)
                        writel(NVREG_POLL_DEFAULT_THROUGHPUT, base + NvRegPollingInterval);
                else
                        writel(NVREG_POLL_DEFAULT_CPU, base + NvRegPollingInterval);
        }
        else
                writel(poll_interval & 0xFFFF, base + NvRegPollingInterval);
        writel(NVREG_UNKSETUP6_VAL, base + NvRegUnknownSetupReg6);
        writel((np->phyaddr << NVREG_ADAPTCTL_PHYSHIFT)|NVREG_ADAPTCTL_PHYVALID|NVREG_ADAPTCTL_RUNNING,
                        base + NvRegAdapterControl);
        writel(NVREG_MIISPEED_BIT8|NVREG_MIIDELAY, base + NvRegMIISpeed);
        writel(NVREG_UNKSETUP4_VAL, base + NvRegUnknownSetupReg4);
        writel(NVREG_WAKEUPFLAGS_VAL, base + NvRegWakeUpFlags);

        i = readl(base + NvRegPowerState);
        if ( (i & NVREG_POWERSTATE_POWEREDUP) == 0)
                writel(NVREG_POWERSTATE_POWEREDUP|i, base + NvRegPowerState);

        pci_push(base);
        udelay(10);
        writel(readl(base + NvRegPowerState) | NVREG_POWERSTATE_VALID, base + NvRegPowerState);

        writel(0, base + NvRegIrqMask);
        pci_push(base);
        writel(NVREG_MIISTAT_MASK2, base + NvRegMIIStatus);
        writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
        pci_push(base);

        ret = request_irq(dev->irq, &nv_nic_irq, SA_SHIRQ, dev->name, dev);
        if (ret)
                goto out_drain;

        /* ask for interrupts */
        writel(np->irqmask, base + NvRegIrqMask);

        spin_lock_irq(&np->lock);
        writel(NVREG_MCASTADDRA_FORCE, base + NvRegMulticastAddrA);
        writel(0, base + NvRegMulticastAddrB);
        writel(0, base + NvRegMulticastMaskA);
        writel(0, base + NvRegMulticastMaskB);
        writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags);
        /* One manual link speed update: Interrupts are enabled, future link
         * speed changes cause interrupts and are handled by nv_link_irq().
         */
        {
                u32 miistat;
                miistat = readl(base + NvRegMIIStatus);
                writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
                dprintk(KERN_INFO "startup: got 0x%08x.\n", miistat);
        }
        /* set linkspeed to invalid value, thus force nv_update_linkspeed
         * to init hw */
        np->linkspeed = 0;
        ret = nv_update_linkspeed(dev);
        nv_start_rx(dev);
        nv_start_tx(dev);
        netif_start_queue(dev);
        if (ret) {
                netif_carrier_on(dev);
        } else {
                printk("%s: no link during initialization.\n", dev->name);
                netif_carrier_off(dev);
        }
        if (oom)
                mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
        spin_unlock_irq(&np->lock);

        return 0;
out_drain:
        drain_ring(dev);
        return ret;
}

static int nv_close(struct net_device *dev)
{
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base;

        spin_lock_irq(&np->lock);
        np->in_shutdown = 1;
        spin_unlock_irq(&np->lock);
        synchronize_irq(dev->irq);

        del_timer_sync(&np->oom_kick);
        del_timer_sync(&np->nic_poll);

        netif_stop_queue(dev);
        spin_lock_irq(&np->lock);
        nv_stop_tx(dev);
        nv_stop_rx(dev);
        nv_txrx_reset(dev);

        /* disable interrupts on the nic or we will lock up */
        base = get_hwbase(dev);
        writel(0, base + NvRegIrqMask);
        pci_push(base);
        dprintk(KERN_INFO "%s: Irqmask is zero again\n", dev->name);

        spin_unlock_irq(&np->lock);

        free_irq(dev->irq, dev);

        drain_ring(dev);

        if (np->wolenabled)
                nv_start_rx(dev);

        /* special op: write back the misordered MAC address - otherwise
         * the next nv_probe would see a wrong address.
         */
        writel(np->orig_mac[0], base + NvRegMacAddrA);
        writel(np->orig_mac[1], base + NvRegMacAddrB);

        /* FIXME: power down nic */

        return 0;
}

static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
{
        struct net_device *dev;
        struct fe_priv *np;
        unsigned long addr;
        u8 __iomem *base;
        int err, i;

        dev = alloc_etherdev(sizeof(struct fe_priv));
        err = -ENOMEM;
        if (!dev)
                goto out;

        np = netdev_priv(dev);
        np->pci_dev = pci_dev;
        spin_lock_init(&np->lock);
        SET_MODULE_OWNER(dev);
        SET_NETDEV_DEV(dev, &pci_dev->dev);

        init_timer(&np->oom_kick);
        np->oom_kick.data = (unsigned long) dev;
        np->oom_kick.function = &nv_do_rx_refill;       /* timer handler */
        init_timer(&np->nic_poll);
        np->nic_poll.data = (unsigned long) dev;
        np->nic_poll.function = &nv_do_nic_poll;        /* timer handler */

        err = pci_enable_device(pci_dev);
        if (err) {
                printk(KERN_INFO "forcedeth: pci_enable_dev failed (%d) for device %s\n",
                                err, pci_name(pci_dev));
                goto out_free;
        }

        pci_set_master(pci_dev);

        err = pci_request_regions(pci_dev, DRV_NAME);
        if (err < 0)
                goto out_disable;

        err = -EINVAL;
        addr = 0;
        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                dprintk(KERN_DEBUG "%s: resource %d start %p len %ld flags 0x%08lx.\n",
                                pci_name(pci_dev), i, (void*)pci_resource_start(pci_dev, i),
                                pci_resource_len(pci_dev, i),
                                pci_resource_flags(pci_dev, i));
                if (pci_resource_flags(pci_dev, i) & IORESOURCE_MEM &&
                                pci_resource_len(pci_dev, i) >= NV_PCI_REGSZ) {
                        addr = pci_resource_start(pci_dev, i);
                        break;
                }
        }
        if (i == DEVICE_COUNT_RESOURCE) {
                printk(KERN_INFO "forcedeth: Couldn't find register window for device %s.\n",
                                        pci_name(pci_dev));
                goto out_relreg;
        }

        /* handle different descriptor versions */
        if (id->driver_data & DEV_HAS_HIGH_DMA) {
                /* packet format 3: supports 40-bit addressing */
                np->desc_ver = DESC_VER_3;
                if (pci_set_dma_mask(pci_dev, 0x0000007fffffffffULL)) {
                        printk(KERN_INFO "forcedeth: 64-bit DMA failed, using 32-bit addressing for device %s.\n",
                                        pci_name(pci_dev));
                } else {
                        dev->features |= NETIF_F_HIGHDMA;
                }
                np->txrxctl_bits = NVREG_TXRXCTL_DESC_3;
        } else if (id->driver_data & DEV_HAS_LARGEDESC) {
                /* packet format 2: supports jumbo frames */
                np->desc_ver = DESC_VER_2;
                np->txrxctl_bits = NVREG_TXRXCTL_DESC_2;
        } else {
                /* original packet format */
                np->desc_ver = DESC_VER_1;
                np->txrxctl_bits = NVREG_TXRXCTL_DESC_1;
        }

        np->pkt_limit = NV_PKTLIMIT_1;
        if (id->driver_data & DEV_HAS_LARGEDESC)
                np->pkt_limit = NV_PKTLIMIT_2;

        if (id->driver_data & DEV_HAS_CHECKSUM) {
                np->txrxctl_bits |= NVREG_TXRXCTL_RXCHECK;
                dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
#ifdef NETIF_F_TSO
                /* disabled dev->features |= NETIF_F_TSO; */
#endif
        }

        err = -ENOMEM;
        np->base = ioremap(addr, NV_PCI_REGSZ);
        if (!np->base)
                goto out_relreg;
        dev->base_addr = (unsigned long)np->base;

        dev->irq = pci_dev->irq;

        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                np->rx_ring.orig = pci_alloc_consistent(pci_dev,
                                        sizeof(struct ring_desc) * (RX_RING + TX_RING),
                                        &np->ring_addr);
                if (!np->rx_ring.orig)
                        goto out_unmap;
                np->tx_ring.orig = &np->rx_ring.orig[RX_RING];
        } else {
                np->rx_ring.ex = pci_alloc_consistent(pci_dev,
                                        sizeof(struct ring_desc_ex) * (RX_RING + TX_RING),
                                        &np->ring_addr);
                if (!np->rx_ring.ex)
                        goto out_unmap;
                np->tx_ring.ex = &np->rx_ring.ex[RX_RING];
        }

        dev->open = nv_open;
        dev->stop = nv_close;
        dev->hard_start_xmit = nv_start_xmit;
        dev->get_stats = nv_get_stats;
        dev->change_mtu = nv_change_mtu;
        dev->set_mac_address = nv_set_mac_address;
        dev->set_multicast_list = nv_set_multicast;
#ifdef CONFIG_NET_POLL_CONTROLLER
        dev->poll_controller = nv_poll_controller;
#endif
        SET_ETHTOOL_OPS(dev, &ops);
        dev->tx_timeout = nv_tx_timeout;
        dev->watchdog_timeo = NV_WATCHDOG_TIMEO;

        pci_set_drvdata(pci_dev, dev);

        /* read the mac address */
        base = get_hwbase(dev);
        np->orig_mac[0] = readl(base + NvRegMacAddrA);
        np->orig_mac[1] = readl(base + NvRegMacAddrB);

        dev->dev_addr[0] = (np->orig_mac[1] >>  8) & 0xff;
        dev->dev_addr[1] = (np->orig_mac[1] >>  0) & 0xff;
        dev->dev_addr[2] = (np->orig_mac[0] >> 24) & 0xff;
        dev->dev_addr[3] = (np->orig_mac[0] >> 16) & 0xff;
        dev->dev_addr[4] = (np->orig_mac[0] >>  8) & 0xff;
        dev->dev_addr[5] = (np->orig_mac[0] >>  0) & 0xff;
        memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);

        if (!is_valid_ether_addr(dev->perm_addr)) {
                /*
                 * Bad mac address. At least one bios sets the mac address
                 * to 01:23:45:67:89:ab
                 */
                printk(KERN_ERR "%s: Invalid Mac address detected: %02x:%02x:%02x:%02x:%02x:%02x\n",
                        pci_name(pci_dev),
                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
                printk(KERN_ERR "Please complain to your hardware vendor. Switching to a random MAC.\n");
                dev->dev_addr[0] = 0x00;
                dev->dev_addr[1] = 0x00;
                dev->dev_addr[2] = 0x6c;
                get_random_bytes(&dev->dev_addr[3], 3);
        }

        dprintk(KERN_DEBUG "%s: MAC Address %02x:%02x:%02x:%02x:%02x:%02x\n", pci_name(pci_dev),
                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);

        /* disable WOL */
        writel(0, base + NvRegWakeUpFlags);
        np->wolenabled = 0;

        if (np->desc_ver == DESC_VER_1) {
                np->tx_flags = NV_TX_VALID;
        } else {
                np->tx_flags = NV_TX2_VALID;
        }
        if (optimization_mode == NV_OPTIMIZATION_MODE_THROUGHPUT)
                np->irqmask = NVREG_IRQMASK_THROUGHPUT;
        else
                np->irqmask = NVREG_IRQMASK_CPU;

        if (id->driver_data & DEV_NEED_TIMERIRQ)
                np->irqmask |= NVREG_IRQ_TIMER;
        if (id->driver_data & DEV_NEED_LINKTIMER) {
                dprintk(KERN_INFO "%s: link timer on.\n", pci_name(pci_dev));
                np->need_linktimer = 1;
                np->link_timeout = jiffies + LINK_TIMEOUT;
        } else {
                dprintk(KERN_INFO "%s: link timer off.\n", pci_name(pci_dev));
                np->need_linktimer = 0;
        }

        /* find a suitable phy */
        for (i = 1; i <= 32; i++) {
                int id1, id2;
                int phyaddr = i & 0x1F;

                spin_lock_irq(&np->lock);
                id1 = mii_rw(dev, phyaddr, MII_PHYSID1, MII_READ);
                spin_unlock_irq(&np->lock);
                if (id1 < 0 || id1 == 0xffff)
                        continue;
                spin_lock_irq(&np->lock);
                id2 = mii_rw(dev, phyaddr, MII_PHYSID2, MII_READ);
                spin_unlock_irq(&np->lock);
                if (id2 < 0 || id2 == 0xffff)
                        continue;

                id1 = (id1 & PHYID1_OUI_MASK) << PHYID1_OUI_SHFT;
                id2 = (id2 & PHYID2_OUI_MASK) >> PHYID2_OUI_SHFT;
                dprintk(KERN_DEBUG "%s: open: Found PHY %04x:%04x at address %d.\n",
                        pci_name(pci_dev), id1, id2, phyaddr);
                np->phyaddr = phyaddr;
                np->phy_oui = id1 | id2;
                break;
        }
        if (i == 33) {
                printk(KERN_INFO "%s: open: Could not find a valid PHY.\n",
                       pci_name(pci_dev));
                goto out_freering;
        }
        
        /* reset it */
        phy_init(dev);

        /* set default link speed settings */
        np->linkspeed = NVREG_LINKSPEED_FORCE|NVREG_LINKSPEED_10;
        np->duplex = 0;
        np->autoneg = 1;

        err = register_netdev(dev);
        if (err) {
                printk(KERN_INFO "forcedeth: unable to register netdev: %d\n", err);
                goto out_freering;
        }
        printk(KERN_INFO "%s: forcedeth.c: subsystem: %05x:%04x bound to %s\n",
                        dev->name, pci_dev->subsystem_vendor, pci_dev->subsystem_device,
                        pci_name(pci_dev));

        return 0;

out_freering:
        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                pci_free_consistent(np->pci_dev, sizeof(struct ring_desc) * (RX_RING + TX_RING),
                                    np->rx_ring.orig, np->ring_addr);
        else
                pci_free_consistent(np->pci_dev, sizeof(struct ring_desc_ex) * (RX_RING + TX_RING),
                                    np->rx_ring.ex, np->ring_addr);
        pci_set_drvdata(pci_dev, NULL);
out_unmap:
        iounmap(get_hwbase(dev));
out_relreg:
        pci_release_regions(pci_dev);
out_disable:
        pci_disable_device(pci_dev);
out_free:
        free_netdev(dev);
out:
        return err;
}

static void __devexit nv_remove(struct pci_dev *pci_dev)
{
        struct net_device *dev = pci_get_drvdata(pci_dev);
        struct fe_priv *np = netdev_priv(dev);

        unregister_netdev(dev);

        /* free all structures */
        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2)
                pci_free_consistent(np->pci_dev, sizeof(struct ring_desc) * (RX_RING + TX_RING), np->rx_ring.orig, np->ring_addr);
        else
                pci_free_consistent(np->pci_dev, sizeof(struct ring_desc_ex) * (RX_RING + TX_RING), np->rx_ring.ex, np->ring_addr);
        iounmap(get_hwbase(dev));
        pci_release_regions(pci_dev);
        pci_disable_device(pci_dev);
        free_netdev(dev);
        pci_set_drvdata(pci_dev, NULL);
}

static struct pci_device_id pci_tbl[] = {
        {       /* nForce Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_1),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER,
        },
        {       /* nForce2 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_2),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER,
        },
        {       /* nForce3 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_3),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER,
        },
        {       /* nForce3 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_4),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM,
        },
        {       /* nForce3 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_5),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM,
        },
        {       /* nForce3 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_6),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM,
        },
        {       /* nForce3 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_7),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM,
        },
        {       /* CK804 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_8),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {       /* CK804 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_9),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP04 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_10),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP04 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_11),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP51 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_12),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP51 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_13),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP55 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_14),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {       /* MCP55 Ethernet Controller */
                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_15),
                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
        },
        {0,},
};

static struct pci_driver driver = {
        .name = "forcedeth",
        .id_table = pci_tbl,
        .probe = nv_probe,
        .remove = __devexit_p(nv_remove),
};


static int __init init_nic(void)
{
        printk(KERN_INFO "forcedeth.c: Reverse Engineered nForce ethernet driver. Version %s.\n", FORCEDETH_VERSION);
        return pci_module_init(&driver);
}

static void __exit exit_nic(void)
{
        pci_unregister_driver(&driver);
}

module_param(max_interrupt_work, int, 0);
MODULE_PARM_DESC(max_interrupt_work, "forcedeth maximum events handled per interrupt");
module_param(optimization_mode, int, 0);
MODULE_PARM_DESC(optimization_mode, "In throughput mode (0), every tx & rx packet will generate an interrupt. In CPU mode (1), interrupts are controlled by a timer.");
module_param(poll_interval, int, 0);
MODULE_PARM_DESC(poll_interval, "Interval determines how frequent timer interrupt is generated by [(time_in_micro_secs * 100) / (2^10)]. Min is 0 and Max is 65535.");

MODULE_AUTHOR("Manfred Spraul <manfred@colorfullife.com>");
MODULE_DESCRIPTION("Reverse Engineered nForce ethernet driver");
MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(pci, pci_tbl);

module_init(init_nic);
module_exit(exit_nic);