hamachi/yellowfin: Move the packet engine drivers

Move the packet engine drivers to drivers/net/ethernet/packetengines/
and the necessary Kconfig and Makefile changes.

CC: Donald Becker <becker@scyld.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

6 files changed, 3436 insertions, 0 deletions

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 3983e702b97a..140dd73420d6 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -39,6 +39,7 @@ source "drivers/net/ethernet/natsemi/Kconfig"
 source "drivers/net/ethernet/8390/Kconfig"
 source "drivers/net/ethernet/nuvoton/Kconfig"
 source "drivers/net/ethernet/oki-semi/Kconfig"
+source "drivers/net/ethernet/packetengines/Kconfig"
 source "drivers/net/ethernet/pasemi/Kconfig"
 source "drivers/net/ethernet/qlogic/Kconfig"
 source "drivers/net/ethernet/racal/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 873d27591466..8a97b193f6ef 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_NET_VENDOR_MYRI) += myricom/
 obj-$(CONFIG_NET_VENDOR_NATSEMI) += natsemi/
 obj-$(CONFIG_NET_VENDOR_NUVOTON) += nuvoton/
 obj-$(CONFIG_NET_VENDOR_OKI) += oki-semi/
+obj-$(CONFIG_NET_PACKET_ENGINE) += packetengines/
 obj-$(CONFIG_NET_VENDOR_PASEMI) += pasemi/
 obj-$(CONFIG_NET_VENDOR_QLOGIC) += qlogic/
 obj-$(CONFIG_NET_VENDOR_RACAL) += racal/
diff --git a/drivers/net/ethernet/packetengines/Kconfig b/drivers/net/ethernet/packetengines/Kconfig
new file mode 100644
index 000000000000..4add1db20f1e
--- /dev/null
+++ b/drivers/net/ethernet/packetengines/Kconfig
@@ -0,0 +1,46 @@
+#
+# Packet engine device configuration
+#
+
+config NET_PACKET_ENGINE
+	bool "Packet Engine devices"
+	depends on PCI
+	---help---
+	  If you have a network (Ethernet) card belonging to this class, say Y
+	  and read the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about packet engine devices. If you say Y, you will
+	  be asked for your specific card in the following questions.
+
+if NET_PACKET_ENGINE
+
+config HAMACHI
+	tristate "Packet Engines Hamachi GNIC-II support"
+	depends on PCI
+	select MII
+	---help---
+	  If you have a Gigabit Ethernet card of this type, say Y and read
+	  the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called hamachi.
+
+config YELLOWFIN
+	tristate "Packet Engines Yellowfin Gigabit-NIC support (EXPERIMENTAL)"
+	depends on PCI && EXPERIMENTAL
+	select CRC32
+	---help---
+	  Say Y here if you have a Packet Engines G-NIC PCI Gigabit Ethernet
+	  adapter or the SYM53C885 Ethernet controller. The Gigabit adapter is
+	  used by the Beowulf Linux cluster project.  See
+	  <http://cesdis.gsfc.nasa.gov/linux/drivers/yellowfin.html> for more
+	  information about this driver in particular and Beowulf in general.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called yellowfin.  This is recommended.
+
+endif # NET_PACKET_ENGINE
diff --git a/drivers/net/ethernet/packetengines/Makefile b/drivers/net/ethernet/packetengines/Makefile
new file mode 100644
index 000000000000..995ccd077d0c
--- /dev/null
+++ b/drivers/net/ethernet/packetengines/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the Packet Engine network device drivers.
+#
+
+obj-$(CONFIG_HAMACHI) += hamachi.o
+obj-$(CONFIG_YELLOWFIN) += yellowfin.o
diff --git a/drivers/net/ethernet/packetengines/hamachi.c b/drivers/net/ethernet/packetengines/hamachi.c
new file mode 100644
index 000000000000..c274b3d77eb5
--- /dev/null
+++ b/drivers/net/ethernet/packetengines/hamachi.c
@@ -0,0 +1,1952 @@
+/* hamachi.c: A Packet Engines GNIC-II Gigabit Ethernet driver for Linux. */
+/*
+	Written 1998-2000 by Donald Becker.
+	Updates 2000 by Keith Underwood.
+
+	This software may be used and distributed according to the terms of
+	the GNU General Public License (GPL), incorporated herein by reference.
+	Drivers based on or derived from this code fall under the GPL and must
+	retain the authorship, copyright and license notice.  This file is not
+	a complete program and may only be used when the entire operating
+	system is licensed under the GPL.
+
+	The author may be reached as becker@scyld.com, or C/O
+	Scyld Computing Corporation
+	410 Severn Ave., Suite 210
+	Annapolis MD 21403
+
+	This driver is for the Packet Engines GNIC-II PCI Gigabit Ethernet
+	adapter.
+
+	Support and updates available at
+	http://www.scyld.com/network/hamachi.html
+	[link no longer provides useful info -jgarzik]
+	or
+	http://www.parl.clemson.edu/~keithu/hamachi.html
+
+*/
+
+#define DRV_NAME	"hamachi"
+#define DRV_VERSION	"2.1"
+#define DRV_RELDATE	"Sept 11, 2006"
+
+
+/* A few user-configurable values. */
+
+static int debug = 1;		/* 1 normal messages, 0 quiet .. 7 verbose.  */
+#define final_version
+#define hamachi_debug debug
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 40;
+static int mtu;
+/* Default values selected by testing on a dual processor PIII-450 */
+/* These six interrupt control parameters may be set directly when loading the
+ * module, or through the rx_params and tx_params variables
+ */
+static int max_rx_latency = 0x11;
+static int max_rx_gap = 0x05;
+static int min_rx_pkt = 0x18;
+static int max_tx_latency = 0x00;
+static int max_tx_gap = 0x00;
+static int min_tx_pkt = 0x30;
+
+/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
+   -Setting to > 1518 causes all frames to be copied
+	-Setting to 0 disables copies
+*/
+static int rx_copybreak;
+
+/* An override for the hardware detection of bus width.
+	Set to 1 to force 32 bit PCI bus detection.  Set to 4 to force 64 bit.
+	Add 2 to disable parity detection.
+*/
+static int force32;
+
+
+/* Used to pass the media type, etc.
+   These exist for driver interoperability.
+   No media types are currently defined.
+		- The lower 4 bits are reserved for the media type.
+		- The next three bits may be set to one of the following:
+			0x00000000 : Autodetect PCI bus
+			0x00000010 : Force 32 bit PCI bus
+			0x00000020 : Disable parity detection
+			0x00000040 : Force 64 bit PCI bus
+			Default is autodetect
+		- The next bit can be used to force half-duplex.  This is a bad
+		  idea since no known implementations implement half-duplex, and,
+		  in general, half-duplex for gigabit ethernet is a bad idea.
+			0x00000080 : Force half-duplex
+			Default is full-duplex.
+		- In the original driver, the ninth bit could be used to force
+		  full-duplex.  Maintain that for compatibility
+		   0x00000200 : Force full-duplex
+*/
+#define MAX_UNITS 8				/* More are supported, limit only on options */
+static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+/* The Hamachi chipset supports 3 parameters each for Rx and Tx
+ * interruput management.  Parameters will be loaded as specified into
+ * the TxIntControl and RxIntControl registers.
+ *
+ * The registers are arranged as follows:
+ *     23 - 16   15 -  8   7    -    0
+ *    _________________________________
+ *   | min_pkt | max_gap | max_latency |
+ *    ---------------------------------
+ *   min_pkt      : The minimum number of packets processed between
+ *                  interrupts.
+ *   max_gap      : The maximum inter-packet gap in units of 8.192 us
+ *   max_latency  : The absolute time between interrupts in units of 8.192 us
+ *
+ */
+static int rx_params[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int tx_params[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+/* Operational parameters that are set at compile time. */
+
+/* Keep the ring sizes a power of two for compile efficiency.
+	The compiler will convert <unsigned>'%'<2^N> into a bit mask.
+   Making the Tx ring too large decreases the effectiveness of channel
+   bonding and packet priority.
+   There are no ill effects from too-large receive rings, except for
+	excessive memory usage */
+/* Empirically it appears that the Tx ring needs to be a little bigger
+   for these Gbit adapters or you get into an overrun condition really
+   easily.  Also, things appear to work a bit better in back-to-back
+   configurations if the Rx ring is 8 times the size of the Tx ring
+*/
+#define TX_RING_SIZE	64
+#define RX_RING_SIZE	512
+#define TX_TOTAL_SIZE	TX_RING_SIZE*sizeof(struct hamachi_desc)
+#define RX_TOTAL_SIZE	RX_RING_SIZE*sizeof(struct hamachi_desc)
+
+/*
+ * Enable netdev_ioctl.  Added interrupt coalescing parameter adjustment.
+ * 2/19/99 Pete Wyckoff <wyckoff@ca.sandia.gov>
+ */
+
+/* play with 64-bit addrlen; seems to be a teensy bit slower  --pw */
+/* #define ADDRLEN 64 */
+
+/*
+ * RX_CHECKSUM turns on card-generated receive checksum generation for
+ *   TCP and UDP packets.  Otherwise the upper layers do the calculation.
+ * 3/10/1999 Pete Wyckoff <wyckoff@ca.sandia.gov>
+ */
+#define RX_CHECKSUM
+
+/* Operational parameters that usually are not changed. */
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (5*HZ)
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/processor.h>	/* Processor type for cache alignment. */
+#include <asm/io.h>
+#include <asm/unaligned.h>
+#include <asm/cache.h>
+
+static const char version[] __devinitconst =
+KERN_INFO DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE "  Written by Donald Becker\n"
+"   Some modifications by Eric kasten <kasten@nscl.msu.edu>\n"
+"   Further modifications by Keith Underwood <keithu@parl.clemson.edu>\n";
+
+
+/* IP_MF appears to be only defined in <netinet/ip.h>, however,
+   we need it for hardware checksumming support.  FYI... some of
+   the definitions in <netinet/ip.h> conflict/duplicate those in
+   other linux headers causing many compiler warnings.
+*/
+#ifndef IP_MF
+  #define IP_MF 0x2000   /* IP more frags from <netinet/ip.h> */
+#endif
+
+/* Define IP_OFFSET to be IPOPT_OFFSET */
+#ifndef IP_OFFSET
+  #ifdef IPOPT_OFFSET
+    #define IP_OFFSET IPOPT_OFFSET
+  #else
+    #define IP_OFFSET 2
+  #endif
+#endif
+
+#define RUN_AT(x) (jiffies + (x))
+
+#ifndef ADDRLEN
+#define ADDRLEN 32
+#endif
+
+/* Condensed bus+endian portability operations. */
+#if ADDRLEN == 64
+#define cpu_to_leXX(addr)	cpu_to_le64(addr)
+#define leXX_to_cpu(addr)	le64_to_cpu(addr)
+#else
+#define cpu_to_leXX(addr)	cpu_to_le32(addr)
+#define leXX_to_cpu(addr)	le32_to_cpu(addr)
+#endif
+
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the Packet Engines "Hamachi"
+Gigabit Ethernet chip.  The only PCA currently supported is the GNIC-II 64-bit
+66Mhz PCI card.
+
+II. Board-specific settings
+
+No jumpers exist on the board.  The chip supports software correction of
+various motherboard wiring errors, however this driver does not support
+that feature.
+
+III. Driver operation
+
+IIIa. Ring buffers
+
+The Hamachi uses a typical descriptor based bus-master architecture.
+The descriptor list is similar to that used by the Digital Tulip.
+This driver uses two statically allocated fixed-size descriptor lists
+formed into rings by a branch from the final descriptor to the beginning of
+the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
+
+This driver uses a zero-copy receive and transmit scheme similar my other
+network drivers.
+The driver allocates full frame size skbuffs for the Rx ring buffers at
+open() time and passes the skb->data field to the Hamachi as receive data
+buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
+a fresh skbuff is allocated and the frame is copied to the new skbuff.
+When the incoming frame is larger, the skbuff is passed directly up the
+protocol stack and replaced by a newly allocated skbuff.
+
+The RX_COPYBREAK value is chosen to trade-off the memory wasted by
+using a full-sized skbuff for small frames vs. the copying costs of larger
+frames.  Gigabit cards are typically used on generously configured machines
+and the underfilled buffers have negligible impact compared to the benefit of
+a single allocation size, so the default value of zero results in never
+copying packets.
+
+IIIb/c. Transmit/Receive Structure
+
+The Rx and Tx descriptor structure are straight-forward, with no historical
+baggage that must be explained.  Unlike the awkward DBDMA structure, there
+are no unused fields or option bits that had only one allowable setting.
+
+Two details should be noted about the descriptors: The chip supports both 32
+bit and 64 bit address structures, and the length field is overwritten on
+the receive descriptors.  The descriptor length is set in the control word
+for each channel. The development driver uses 32 bit addresses only, however
+64 bit addresses may be enabled for 64 bit architectures e.g. the Alpha.
+
+IIId. Synchronization
+
+This driver is very similar to my other network drivers.
+The driver runs as two independent, single-threaded flows of control.  One
+is the send-packet routine, which enforces single-threaded use by the
+dev->tbusy flag.  The other thread is the interrupt handler, which is single
+threaded by the hardware and other software.
+
+The send packet thread has partial control over the Tx ring and 'dev->tbusy'
+flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
+queue slot is empty, it clears the tbusy flag when finished otherwise it sets
+the 'hmp->tx_full' flag.
+
+The interrupt handler has exclusive control over the Rx ring and records stats
+from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
+empty by incrementing the dirty_tx mark. Iff the 'hmp->tx_full' flag is set, it
+clears both the tx_full and tbusy flags.
+
+IV. Notes
+
+Thanks to Kim Stearns of Packet Engines for providing a pair of GNIC-II boards.
+
+IVb. References
+
+Hamachi Engineering Design Specification, 5/15/97
+(Note: This version was marked "Confidential".)
+
+IVc. Errata
+
+None noted.
+
+V.  Recent Changes
+
+01/15/1999 EPK  Enlargement of the TX and RX ring sizes.  This appears
+    to help avoid some stall conditions -- this needs further research.
+
+01/15/1999 EPK  Creation of the hamachi_tx function.  This function cleans
+    the Tx ring and is called from hamachi_start_xmit (this used to be
+    called from hamachi_interrupt but it tends to delay execution of the
+    interrupt handler and thus reduce bandwidth by reducing the latency
+    between hamachi_rx()'s).  Notably, some modification has been made so
+    that the cleaning loop checks only to make sure that the DescOwn bit
+    isn't set in the status flag since the card is not required
+    to set the entire flag to zero after processing.
+
+01/15/1999 EPK In the hamachi_start_tx function, the Tx ring full flag is
+    checked before attempting to add a buffer to the ring.  If the ring is full
+    an attempt is made to free any dirty buffers and thus find space for
+    the new buffer or the function returns non-zero which should case the
+    scheduler to reschedule the buffer later.
+
+01/15/1999 EPK Some adjustments were made to the chip initialization.
+    End-to-end flow control should now be fully active and the interrupt
+    algorithm vars have been changed.  These could probably use further tuning.
+
+01/15/1999 EPK Added the max_{rx,tx}_latency options.  These are used to
+    set the rx and tx latencies for the Hamachi interrupts. If you're having
+    problems with network stalls, try setting these to higher values.
+    Valid values are 0x00 through 0xff.
+
+01/15/1999 EPK In general, the overall bandwidth has increased and
+    latencies are better (sometimes by a factor of 2).  Stalls are rare at
+    this point, however there still appears to be a bug somewhere between the
+    hardware and driver.  TCP checksum errors under load also appear to be
+    eliminated at this point.
+
+01/18/1999 EPK Ensured that the DescEndRing bit was being set on both the
+    Rx and Tx rings.  This appears to have been affecting whether a particular
+    peer-to-peer connection would hang under high load.  I believe the Rx
+    rings was typically getting set correctly, but the Tx ring wasn't getting
+    the DescEndRing bit set during initialization. ??? Does this mean the
+    hamachi card is using the DescEndRing in processing even if a particular
+    slot isn't in use -- hypothetically, the card might be searching the
+    entire Tx ring for slots with the DescOwn bit set and then processing
+    them.  If the DescEndRing bit isn't set, then it might just wander off
+    through memory until it hits a chunk of data with that bit set
+    and then looping back.
+
+02/09/1999 EPK Added Michel Mueller's TxDMA Interrupt and Tx-timeout
+    problem (TxCmd and RxCmd need only to be set when idle or stopped.
+
+02/09/1999 EPK Added code to check/reset dev->tbusy in hamachi_interrupt.
+    (Michel Mueller pointed out the ``permanently busy'' potential
+    problem here).
+
+02/22/1999 EPK Added Pete Wyckoff's ioctl to control the Tx/Rx latencies.
+
+02/23/1999 EPK Verified that the interrupt status field bits for Tx were
+    incorrectly defined and corrected (as per Michel Mueller).
+
+02/23/1999 EPK Corrected the Tx full check to check that at least 4 slots
+    were available before reseting the tbusy and tx_full flags
+    (as per Michel Mueller).
+
+03/11/1999 EPK Added Pete Wyckoff's hardware checksumming support.
+
+12/31/1999 KDU Cleaned up assorted things and added Don's code to force
+32 bit.
+
+02/20/2000 KDU Some of the control was just plain odd.  Cleaned up the
+hamachi_start_xmit() and hamachi_interrupt() code.  There is still some
+re-structuring I would like to do.
+
+03/01/2000 KDU Experimenting with a WIDE range of interrupt mitigation
+parameters on a dual P3-450 setup yielded the new default interrupt
+mitigation parameters.  Tx should interrupt VERY infrequently due to
+Eric's scheme.  Rx should be more often...
+
+03/13/2000 KDU Added a patch to make the Rx Checksum code interact
+nicely with non-linux machines.
+
+03/13/2000 KDU Experimented with some of the configuration values:
+
+	-It seems that enabling PCI performance commands for descriptors
+	(changing RxDMACtrl and TxDMACtrl lower nibble from 5 to D) has minimal
+	performance impact for any of my tests. (ttcp, netpipe, netperf)  I will
+	leave them that way until I hear further feedback.
+
+	-Increasing the PCI_LATENCY_TIMER to 130
+	(2 + (burst size of 128 * (0 wait states + 1))) seems to slightly
+	degrade performance.  Leaving default at 64 pending further information.
+
+03/14/2000 KDU Further tuning:
+
+	-adjusted boguscnt in hamachi_rx() to depend on interrupt
+	mitigation parameters chosen.
+
+	-Selected a set of interrupt parameters based on some extensive testing.
+	These may change with more testing.
+
+TO DO:
+
+-Consider borrowing from the acenic driver code to check PCI_COMMAND for
+PCI_COMMAND_INVALIDATE.  Set maximum burst size to cache line size in
+that case.
+
+-fix the reset procedure.  It doesn't quite work.
+*/
+
+/* A few values that may be tweaked. */
+/* Size of each temporary Rx buffer, calculated as:
+ * 1518 bytes (ethernet packet) + 2 bytes (to get 8 byte alignment for
+ * the card) + 8 bytes of status info + 8 bytes for the Rx Checksum
+ */
+#define PKT_BUF_SZ		1536
+
+/* For now, this is going to be set to the maximum size of an ethernet
+ * packet.  Eventually, we may want to make it a variable that is
+ * related to the MTU
+ */
+#define MAX_FRAME_SIZE  1518
+
+/* The rest of these values should never change. */
+
+static void hamachi_timer(unsigned long data);
+
+enum capability_flags {CanHaveMII=1, };
+static const struct chip_info {
+	u16	vendor_id, device_id, device_id_mask, pad;
+	const char *name;
+	void (*media_timer)(unsigned long data);
+	int flags;
+} chip_tbl[] = {
+	{0x1318, 0x0911, 0xffff, 0, "Hamachi GNIC-II", hamachi_timer, 0},
+	{0,},
+};
+
+/* Offsets to the Hamachi registers.  Various sizes. */
+enum hamachi_offsets {
+	TxDMACtrl=0x00, TxCmd=0x04, TxStatus=0x06, TxPtr=0x08, TxCurPtr=0x10,
+	RxDMACtrl=0x20, RxCmd=0x24, RxStatus=0x26, RxPtr=0x28, RxCurPtr=0x30,
+	PCIClkMeas=0x060, MiscStatus=0x066, ChipRev=0x68, ChipReset=0x06B,
+	LEDCtrl=0x06C, VirtualJumpers=0x06D, GPIO=0x6E,
+	TxChecksum=0x074, RxChecksum=0x076,
+	TxIntrCtrl=0x078, RxIntrCtrl=0x07C,
+	InterruptEnable=0x080, InterruptClear=0x084, IntrStatus=0x088,
+	EventStatus=0x08C,
+	MACCnfg=0x0A0, FrameGap0=0x0A2, FrameGap1=0x0A4,
+	/* See enum MII_offsets below. */
+	MACCnfg2=0x0B0, RxDepth=0x0B8, FlowCtrl=0x0BC, MaxFrameSize=0x0CE,
+	AddrMode=0x0D0, StationAddr=0x0D2,
+	/* Gigabit AutoNegotiation. */
+	ANCtrl=0x0E0, ANStatus=0x0E2, ANXchngCtrl=0x0E4, ANAdvertise=0x0E8,
+	ANLinkPartnerAbility=0x0EA,
+	EECmdStatus=0x0F0, EEData=0x0F1, EEAddr=0x0F2,
+	FIFOcfg=0x0F8,
+};
+
+/* Offsets to the MII-mode registers. */
+enum MII_offsets {
+	MII_Cmd=0xA6, MII_Addr=0xA8, MII_Wr_Data=0xAA, MII_Rd_Data=0xAC,
+	MII_Status=0xAE,
+};
+
+/* Bits in the interrupt status/mask registers. */
+enum intr_status_bits {
+	IntrRxDone=0x01, IntrRxPCIFault=0x02, IntrRxPCIErr=0x04,
+	IntrTxDone=0x100, IntrTxPCIFault=0x200, IntrTxPCIErr=0x400,
+	LinkChange=0x10000, NegotiationChange=0x20000, StatsMax=0x40000, };
+
+/* The Hamachi Rx and Tx buffer descriptors. */
+struct hamachi_desc {
+	__le32 status_n_length;
+#if ADDRLEN == 64
+	u32 pad;
+	__le64 addr;
+#else
+	__le32 addr;
+#endif
+};
+
+/* Bits in hamachi_desc.status_n_length */
+enum desc_status_bits {
+	DescOwn=0x80000000, DescEndPacket=0x40000000, DescEndRing=0x20000000,
+	DescIntr=0x10000000,
+};
+
+#define PRIV_ALIGN	15  			/* Required alignment mask */
+#define MII_CNT		4
+struct hamachi_private {
+	/* Descriptor rings first for alignment.  Tx requires a second descriptor
+	   for status. */
+	struct hamachi_desc *rx_ring;
+	struct hamachi_desc *tx_ring;
+	struct sk_buff* rx_skbuff[RX_RING_SIZE];
+	struct sk_buff* tx_skbuff[TX_RING_SIZE];
+	dma_addr_t tx_ring_dma;
+	dma_addr_t rx_ring_dma;
+	struct timer_list timer;		/* Media selection timer. */
+	/* Frequently used and paired value: keep adjacent for cache effect. */
+	spinlock_t lock;
+	int chip_id;
+	unsigned int cur_rx, dirty_rx;		/* Producer/consumer ring indices */
+	unsigned int cur_tx, dirty_tx;
+	unsigned int rx_buf_sz;			/* Based on MTU+slack. */
+	unsigned int tx_full:1;			/* The Tx queue is full. */
+	unsigned int duplex_lock:1;
+	unsigned int default_port:4;		/* Last dev->if_port value. */
+	/* MII transceiver section. */
+	int mii_cnt;								/* MII device addresses. */
+	struct mii_if_info mii_if;		/* MII lib hooks/info */
+	unsigned char phys[MII_CNT];		/* MII device addresses, only first one used. */
+	u32 rx_int_var, tx_int_var;	/* interrupt control variables */
+	u32 option;							/* Hold on to a copy of the options */
+	struct pci_dev *pci_dev;
+	void __iomem *base;
+};
+
+MODULE_AUTHOR("Donald Becker <becker@scyld.com>, Eric Kasten <kasten@nscl.msu.edu>, Keith Underwood <keithu@parl.clemson.edu>");
+MODULE_DESCRIPTION("Packet Engines 'Hamachi' GNIC-II Gigabit Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_param(max_interrupt_work, int, 0);
+module_param(mtu, int, 0);
+module_param(debug, int, 0);
+module_param(min_rx_pkt, int, 0);
+module_param(max_rx_gap, int, 0);
+module_param(max_rx_latency, int, 0);
+module_param(min_tx_pkt, int, 0);
+module_param(max_tx_gap, int, 0);
+module_param(max_tx_latency, int, 0);
+module_param(rx_copybreak, int, 0);
+module_param_array(rx_params, int, NULL, 0);
+module_param_array(tx_params, int, NULL, 0);
+module_param_array(options, int, NULL, 0);
+module_param_array(full_duplex, int, NULL, 0);
+module_param(force32, int, 0);
+MODULE_PARM_DESC(max_interrupt_work, "GNIC-II maximum events handled per interrupt");
+MODULE_PARM_DESC(mtu, "GNIC-II MTU (all boards)");
+MODULE_PARM_DESC(debug, "GNIC-II debug level (0-7)");
+MODULE_PARM_DESC(min_rx_pkt, "GNIC-II minimum Rx packets processed between interrupts");
+MODULE_PARM_DESC(max_rx_gap, "GNIC-II maximum Rx inter-packet gap in 8.192 microsecond units");
+MODULE_PARM_DESC(max_rx_latency, "GNIC-II time between Rx interrupts in 8.192 microsecond units");
+MODULE_PARM_DESC(min_tx_pkt, "GNIC-II minimum Tx packets processed between interrupts");
+MODULE_PARM_DESC(max_tx_gap, "GNIC-II maximum Tx inter-packet gap in 8.192 microsecond units");
+MODULE_PARM_DESC(max_tx_latency, "GNIC-II time between Tx interrupts in 8.192 microsecond units");
+MODULE_PARM_DESC(rx_copybreak, "GNIC-II copy breakpoint for copy-only-tiny-frames");
+MODULE_PARM_DESC(rx_params, "GNIC-II min_rx_pkt+max_rx_gap+max_rx_latency");
+MODULE_PARM_DESC(tx_params, "GNIC-II min_tx_pkt+max_tx_gap+max_tx_latency");
+MODULE_PARM_DESC(options, "GNIC-II Bits 0-3: media type, bits 4-6: as force32, bit 7: half duplex, bit 9 full duplex");
+MODULE_PARM_DESC(full_duplex, "GNIC-II full duplex setting(s) (1)");
+MODULE_PARM_DESC(force32, "GNIC-II: Bit 0: 32 bit PCI, bit 1: disable parity, bit 2: 64 bit PCI (all boards)");
+
+static int read_eeprom(void __iomem *ioaddr, int location);
+static int mdio_read(struct net_device *dev, int phy_id, int location);
+static void mdio_write(struct net_device *dev, int phy_id, int location, int value);
+static int hamachi_open(struct net_device *dev);
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static void hamachi_timer(unsigned long data);
+static void hamachi_tx_timeout(struct net_device *dev);
+static void hamachi_init_ring(struct net_device *dev);
+static netdev_tx_t hamachi_start_xmit(struct sk_buff *skb,
+				      struct net_device *dev);
+static irqreturn_t hamachi_interrupt(int irq, void *dev_instance);
+static int hamachi_rx(struct net_device *dev);
+static inline int hamachi_tx(struct net_device *dev);
+static void hamachi_error(struct net_device *dev, int intr_status);
+static int hamachi_close(struct net_device *dev);
+static struct net_device_stats *hamachi_get_stats(struct net_device *dev);
+static void set_rx_mode(struct net_device *dev);
+static const struct ethtool_ops ethtool_ops;
+static const struct ethtool_ops ethtool_ops_no_mii;
+
+static const struct net_device_ops hamachi_netdev_ops = {
+	.ndo_open		= hamachi_open,
+	.ndo_stop		= hamachi_close,
+	.ndo_start_xmit		= hamachi_start_xmit,
+	.ndo_get_stats		= hamachi_get_stats,
+	.ndo_set_multicast_list	= set_rx_mode,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_tx_timeout		= hamachi_tx_timeout,
+	.ndo_do_ioctl		= netdev_ioctl,
+};
+
+
+static int __devinit hamachi_init_one (struct pci_dev *pdev,
+				    const struct pci_device_id *ent)
+{
+	struct hamachi_private *hmp;
+	int option, i, rx_int_var, tx_int_var, boguscnt;
+	int chip_id = ent->driver_data;
+	int irq;
+	void __iomem *ioaddr;
+	unsigned long base;
+	static int card_idx;
+	struct net_device *dev;
+	void *ring_space;
+	dma_addr_t ring_dma;
+	int ret = -ENOMEM;
+
+/* when built into the kernel, we only print version if device is found */
+#ifndef MODULE
+	static int printed_version;
+	if (!printed_version++)
+		printk(version);
+#endif
+
+	if (pci_enable_device(pdev)) {
+		ret = -EIO;
+		goto err_out;
+	}
+
+	base = pci_resource_start(pdev, 0);
+#ifdef __alpha__				/* Really "64 bit addrs" */
+	base |= (pci_resource_start(pdev, 1) << 32);
+#endif
+
+	pci_set_master(pdev);
+
+	i = pci_request_regions(pdev, DRV_NAME);
+	if (i)
+		return i;
+
+	irq = pdev->irq;
+	ioaddr = ioremap(base, 0x400);
+	if (!ioaddr)
+		goto err_out_release;
+
+	dev = alloc_etherdev(sizeof(struct hamachi_private));
+	if (!dev)
+		goto err_out_iounmap;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = 1 ? read_eeprom(ioaddr, 4 + i)
+			: readb(ioaddr + StationAddr + i);
+
+#if ! defined(final_version)
+	if (hamachi_debug > 4)
+		for (i = 0; i < 0x10; i++)
+			printk("%2.2x%s",
+				   read_eeprom(ioaddr, i), i % 16 != 15 ? " " : "\n");
+#endif
+
+	hmp = netdev_priv(dev);
+	spin_lock_init(&hmp->lock);
+
+	hmp->mii_if.dev = dev;
+	hmp->mii_if.mdio_read = mdio_read;
+	hmp->mii_if.mdio_write = mdio_write;
+	hmp->mii_if.phy_id_mask = 0x1f;
+	hmp->mii_if.reg_num_mask = 0x1f;
+
+	ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space)
+		goto err_out_cleardev;
+	hmp->tx_ring = ring_space;
+	hmp->tx_ring_dma = ring_dma;
+
+	ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space)
+		goto err_out_unmap_tx;
+	hmp->rx_ring = ring_space;
+	hmp->rx_ring_dma = ring_dma;
+
+	/* Check for options being passed in */
+	option = card_idx < MAX_UNITS ? options[card_idx] : 0;
+	if (dev->mem_start)
+		option = dev->mem_start;
+
+	/* If the bus size is misidentified, do the following. */
+	force32 = force32 ? force32 :
+		((option  >= 0) ? ((option & 0x00000070) >> 4) : 0 );
+	if (force32)
+		writeb(force32, ioaddr + VirtualJumpers);
+
+	/* Hmmm, do we really need to reset the chip???. */
+	writeb(0x01, ioaddr + ChipReset);
+
+	/* After a reset, the clock speed measurement of the PCI bus will not
+	 * be valid for a moment.  Wait for a little while until it is.  If
+	 * it takes more than 10ms, forget it.
+	 */
+	udelay(10);
+	i = readb(ioaddr + PCIClkMeas);
+	for (boguscnt = 0; (!(i & 0x080)) && boguscnt < 1000; boguscnt++){
+		udelay(10);
+		i = readb(ioaddr + PCIClkMeas);
+	}
+
+	hmp->base = ioaddr;
+	dev->base_addr = (unsigned long)ioaddr;
+	dev->irq = irq;
+	pci_set_drvdata(pdev, dev);
+
+	hmp->chip_id = chip_id;
+	hmp->pci_dev = pdev;
+
+	/* The lower four bits are the media type. */
+	if (option > 0) {
+		hmp->option = option;
+		if (option & 0x200)
+			hmp->mii_if.full_duplex = 1;
+		else if (option & 0x080)
+			hmp->mii_if.full_duplex = 0;
+		hmp->default_port = option & 15;
+		if (hmp->default_port)
+			hmp->mii_if.force_media = 1;
+	}
+	if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
+		hmp->mii_if.full_duplex = 1;
+
+	/* lock the duplex mode if someone specified a value */
+	if (hmp->mii_if.full_duplex || (option & 0x080))
+		hmp->duplex_lock = 1;
+
+	/* Set interrupt tuning parameters */
+	max_rx_latency = max_rx_latency & 0x00ff;
+	max_rx_gap = max_rx_gap & 0x00ff;
+	min_rx_pkt = min_rx_pkt & 0x00ff;
+	max_tx_latency = max_tx_latency & 0x00ff;
+	max_tx_gap = max_tx_gap & 0x00ff;
+	min_tx_pkt = min_tx_pkt & 0x00ff;
+
+	rx_int_var = card_idx < MAX_UNITS ? rx_params[card_idx] : -1;
+	tx_int_var = card_idx < MAX_UNITS ? tx_params[card_idx] : -1;
+	hmp->rx_int_var = rx_int_var >= 0 ? rx_int_var :
+		(min_rx_pkt << 16 | max_rx_gap << 8 | max_rx_latency);
+	hmp->tx_int_var = tx_int_var >= 0 ? tx_int_var :
+		(min_tx_pkt << 16 | max_tx_gap << 8 | max_tx_latency);
+
+
+	/* The Hamachi-specific entries in the device structure. */
+	dev->netdev_ops = &hamachi_netdev_ops;
+	if (chip_tbl[hmp->chip_id].flags & CanHaveMII)
+		SET_ETHTOOL_OPS(dev, &ethtool_ops);
+	else
+		SET_ETHTOOL_OPS(dev, &ethtool_ops_no_mii);
+	dev->watchdog_timeo = TX_TIMEOUT;
+	if (mtu)
+		dev->mtu = mtu;
+
+	i = register_netdev(dev);
+	if (i) {
+		ret = i;
+		goto err_out_unmap_rx;
+	}
+
+	printk(KERN_INFO "%s: %s type %x at %p, %pM, IRQ %d.\n",
+		   dev->name, chip_tbl[chip_id].name, readl(ioaddr + ChipRev),
+		   ioaddr, dev->dev_addr, irq);
+	i = readb(ioaddr + PCIClkMeas);
+	printk(KERN_INFO "%s:  %d-bit %d Mhz PCI bus (%d), Virtual Jumpers "
+		   "%2.2x, LPA %4.4x.\n",
+		   dev->name, readw(ioaddr + MiscStatus) & 1 ? 64 : 32,
+		   i ? 2000/(i&0x7f) : 0, i&0x7f, (int)readb(ioaddr + VirtualJumpers),
+		   readw(ioaddr + ANLinkPartnerAbility));
+
+	if (chip_tbl[hmp->chip_id].flags & CanHaveMII) {
+		int phy, phy_idx = 0;
+		for (phy = 0; phy < 32 && phy_idx < MII_CNT; phy++) {
+			int mii_status = mdio_read(dev, phy, MII_BMSR);
+			if (mii_status != 0xffff  &&
+				mii_status != 0x0000) {
+				hmp->phys[phy_idx++] = phy;
+				hmp->mii_if.advertising = mdio_read(dev, phy, MII_ADVERTISE);
+				printk(KERN_INFO "%s: MII PHY found at address %d, status "
+					   "0x%4.4x advertising %4.4x.\n",
+					   dev->name, phy, mii_status, hmp->mii_if.advertising);
+			}
+		}
+		hmp->mii_cnt = phy_idx;
+		if (hmp->mii_cnt > 0)
+			hmp->mii_if.phy_id = hmp->phys[0];
+		else
+			memset(&hmp->mii_if, 0, sizeof(hmp->mii_if));
+	}
+	/* Configure gigabit autonegotiation. */
+	writew(0x0400, ioaddr + ANXchngCtrl);	/* Enable legacy links. */
+	writew(0x08e0, ioaddr + ANAdvertise);	/* Set our advertise word. */
+	writew(0x1000, ioaddr + ANCtrl);			/* Enable negotiation */
+
+	card_idx++;
+	return 0;
+
+err_out_unmap_rx:
+	pci_free_consistent(pdev, RX_TOTAL_SIZE, hmp->rx_ring,
+		hmp->rx_ring_dma);
+err_out_unmap_tx:
+	pci_free_consistent(pdev, TX_TOTAL_SIZE, hmp->tx_ring,
+		hmp->tx_ring_dma);
+err_out_cleardev:
+	free_netdev (dev);
+err_out_iounmap:
+	iounmap(ioaddr);
+err_out_release:
+	pci_release_regions(pdev);
+err_out:
+	return ret;
+}
+
+static int __devinit read_eeprom(void __iomem *ioaddr, int location)
+{
+	int bogus_cnt = 1000;
+
+	/* We should check busy first - per docs -KDU */
+	while ((readb(ioaddr + EECmdStatus) & 0x40)  && --bogus_cnt > 0);
+	writew(location, ioaddr + EEAddr);
+	writeb(0x02, ioaddr + EECmdStatus);
+	bogus_cnt = 1000;
+	while ((readb(ioaddr + EECmdStatus) & 0x40)  && --bogus_cnt > 0);
+	if (hamachi_debug > 5)
+		printk("   EEPROM status is %2.2x after %d ticks.\n",
+			   (int)readb(ioaddr + EECmdStatus), 1000- bogus_cnt);
+	return readb(ioaddr + EEData);
+}
+
+/* MII Managemen Data I/O accesses.
+   These routines assume the MDIO controller is idle, and do not exit until
+   the command is finished. */
+
+static int mdio_read(struct net_device *dev, int phy_id, int location)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	int i;
+
+	/* We should check busy first - per docs -KDU */
+	for (i = 10000; i >= 0; i--)
+		if ((readw(ioaddr + MII_Status) & 1) == 0)
+			break;
+	writew((phy_id<<8) + location, ioaddr + MII_Addr);
+	writew(0x0001, ioaddr + MII_Cmd);
+	for (i = 10000; i >= 0; i--)
+		if ((readw(ioaddr + MII_Status) & 1) == 0)
+			break;
+	return readw(ioaddr + MII_Rd_Data);
+}
+
+static void mdio_write(struct net_device *dev, int phy_id, int location, int value)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	int i;
+
+	/* We should check busy first - per docs -KDU */
+	for (i = 10000; i >= 0; i--)
+		if ((readw(ioaddr + MII_Status) & 1) == 0)
+			break;
+	writew((phy_id<<8) + location, ioaddr + MII_Addr);
+	writew(value, ioaddr + MII_Wr_Data);
+
+	/* Wait for the command to finish. */
+	for (i = 10000; i >= 0; i--)
+		if ((readw(ioaddr + MII_Status) & 1) == 0)
+			break;
+}
+
+
+static int hamachi_open(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	int i;
+	u32 rx_int_var, tx_int_var;
+	u16 fifo_info;
+
+	i = request_irq(dev->irq, hamachi_interrupt, IRQF_SHARED, dev->name, dev);
+	if (i)
+		return i;
+
+	if (hamachi_debug > 1)
+		printk(KERN_DEBUG "%s: hamachi_open() irq %d.\n",
+			   dev->name, dev->irq);
+
+	hamachi_init_ring(dev);
+
+#if ADDRLEN == 64
+	/* writellll anyone ? */
+	writel(hmp->rx_ring_dma, ioaddr + RxPtr);
+	writel(hmp->rx_ring_dma >> 32, ioaddr + RxPtr + 4);
+	writel(hmp->tx_ring_dma, ioaddr + TxPtr);
+	writel(hmp->tx_ring_dma >> 32, ioaddr + TxPtr + 4);
+#else
+	writel(hmp->rx_ring_dma, ioaddr + RxPtr);
+	writel(hmp->tx_ring_dma, ioaddr + TxPtr);
+#endif
+
+	/* TODO:  It would make sense to organize this as words since the card
+	 * documentation does. -KDU
+	 */
+	for (i = 0; i < 6; i++)
+		writeb(dev->dev_addr[i], ioaddr + StationAddr + i);
+
+	/* Initialize other registers: with so many this eventually this will
+	   converted to an offset/value list. */
+
+	/* Configure the FIFO */
+	fifo_info = (readw(ioaddr + GPIO) & 0x00C0) >> 6;
+	switch (fifo_info){
+		case 0 :
+			/* No FIFO */
+			writew(0x0000, ioaddr + FIFOcfg);
+			break;
+		case 1 :
+			/* Configure the FIFO for 512K external, 16K used for Tx. */
+			writew(0x0028, ioaddr + FIFOcfg);
+			break;
+		case 2 :
+			/* Configure the FIFO for 1024 external, 32K used for Tx. */
+			writew(0x004C, ioaddr + FIFOcfg);
+			break;
+		case 3 :
+			/* Configure the FIFO for 2048 external, 32K used for Tx. */
+			writew(0x006C, ioaddr + FIFOcfg);
+			break;
+		default :
+			printk(KERN_WARNING "%s:  Unsupported external memory config!\n",
+				dev->name);
+			/* Default to no FIFO */
+			writew(0x0000, ioaddr + FIFOcfg);
+			break;
+	}
+
+	if (dev->if_port == 0)
+		dev->if_port = hmp->default_port;
+
+
+	/* Setting the Rx mode will start the Rx process. */
+	/* If someone didn't choose a duplex, default to full-duplex */
+	if (hmp->duplex_lock != 1)
+		hmp->mii_if.full_duplex = 1;
+
+	/* always 1, takes no more time to do it */
+	writew(0x0001, ioaddr + RxChecksum);
+	writew(0x0000, ioaddr + TxChecksum);
+	writew(0x8000, ioaddr + MACCnfg); /* Soft reset the MAC */
+	writew(0x215F, ioaddr + MACCnfg);
+	writew(0x000C, ioaddr + FrameGap0);
+	/* WHAT?!?!?  Why isn't this documented somewhere? -KDU */
+	writew(0x1018, ioaddr + FrameGap1);
+	/* Why do we enable receives/transmits here? -KDU */
+	writew(0x0780, ioaddr + MACCnfg2); /* Upper 16 bits control LEDs. */
+	/* Enable automatic generation of flow control frames, period 0xffff. */
+	writel(0x0030FFFF, ioaddr + FlowCtrl);
+	writew(MAX_FRAME_SIZE, ioaddr + MaxFrameSize); 	/* dev->mtu+14 ??? */
+
+	/* Enable legacy links. */
+	writew(0x0400, ioaddr + ANXchngCtrl);	/* Enable legacy links. */
+	/* Initial Link LED to blinking red. */
+	writeb(0x03, ioaddr + LEDCtrl);
+
+	/* Configure interrupt mitigation.  This has a great effect on
+	   performance, so systems tuning should start here!. */
+
+	rx_int_var = hmp->rx_int_var;
+	tx_int_var = hmp->tx_int_var;
+
+	if (hamachi_debug > 1) {
+		printk("max_tx_latency: %d, max_tx_gap: %d, min_tx_pkt: %d\n",
+			tx_int_var & 0x00ff, (tx_int_var & 0x00ff00) >> 8,
+			(tx_int_var & 0x00ff0000) >> 16);
+		printk("max_rx_latency: %d, max_rx_gap: %d, min_rx_pkt: %d\n",
+			rx_int_var & 0x00ff, (rx_int_var & 0x00ff00) >> 8,
+			(rx_int_var & 0x00ff0000) >> 16);
+		printk("rx_int_var: %x, tx_int_var: %x\n", rx_int_var, tx_int_var);
+	}
+
+	writel(tx_int_var, ioaddr + TxIntrCtrl);
+	writel(rx_int_var, ioaddr + RxIntrCtrl);
+
+	set_rx_mode(dev);
+
+	netif_start_queue(dev);
+
+	/* Enable interrupts by setting the interrupt mask. */
+	writel(0x80878787, ioaddr + InterruptEnable);
+	writew(0x0000, ioaddr + EventStatus);	/* Clear non-interrupting events */
+
+	/* Configure and start the DMA channels. */
+	/* Burst sizes are in the low three bits: size = 4<<(val&7) */
+#if ADDRLEN == 64
+	writew(0x005D, ioaddr + RxDMACtrl); 		/* 128 dword bursts */
+	writew(0x005D, ioaddr + TxDMACtrl);
+#else
+	writew(0x001D, ioaddr + RxDMACtrl);
+	writew(0x001D, ioaddr + TxDMACtrl);
+#endif
+	writew(0x0001, ioaddr + RxCmd);
+
+	if (hamachi_debug > 2) {
+		printk(KERN_DEBUG "%s: Done hamachi_open(), status: Rx %x Tx %x.\n",
+			   dev->name, readw(ioaddr + RxStatus), readw(ioaddr + TxStatus));
+	}
+	/* Set the timer to check for link beat. */
+	init_timer(&hmp->timer);
+	hmp->timer.expires = RUN_AT((24*HZ)/10);			/* 2.4 sec. */
+	hmp->timer.data = (unsigned long)dev;
+	hmp->timer.function = hamachi_timer;				/* timer handler */
+	add_timer(&hmp->timer);
+
+	return 0;
+}
+
+static inline int hamachi_tx(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+
+	/* Update the dirty pointer until we find an entry that is
+		still owned by the card */
+	for (; hmp->cur_tx - hmp->dirty_tx > 0; hmp->dirty_tx++) {
+		int entry = hmp->dirty_tx % TX_RING_SIZE;
+		struct sk_buff *skb;
+
+		if (hmp->tx_ring[entry].status_n_length & cpu_to_le32(DescOwn))
+			break;
+		/* Free the original skb. */
+		skb = hmp->tx_skbuff[entry];
+		if (skb) {
+			pci_unmap_single(hmp->pci_dev,
+				leXX_to_cpu(hmp->tx_ring[entry].addr),
+				skb->len, PCI_DMA_TODEVICE);
+			dev_kfree_skb(skb);
+			hmp->tx_skbuff[entry] = NULL;
+		}
+		hmp->tx_ring[entry].status_n_length = 0;
+		if (entry >= TX_RING_SIZE-1)
+			hmp->tx_ring[TX_RING_SIZE-1].status_n_length |=
+				cpu_to_le32(DescEndRing);
+		dev->stats.tx_packets++;
+	}
+
+	return 0;
+}
+
+static void hamachi_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	int next_tick = 10*HZ;
+
+	if (hamachi_debug > 2) {
+		printk(KERN_INFO "%s: Hamachi Autonegotiation status %4.4x, LPA "
+			   "%4.4x.\n", dev->name, readw(ioaddr + ANStatus),
+			   readw(ioaddr + ANLinkPartnerAbility));
+		printk(KERN_INFO "%s: Autonegotiation regs %4.4x %4.4x %4.4x "
+		       "%4.4x %4.4x %4.4x.\n", dev->name,
+		       readw(ioaddr + 0x0e0),
+		       readw(ioaddr + 0x0e2),
+		       readw(ioaddr + 0x0e4),
+		       readw(ioaddr + 0x0e6),
+		       readw(ioaddr + 0x0e8),
+		       readw(ioaddr + 0x0eA));
+	}
+	/* We could do something here... nah. */
+	hmp->timer.expires = RUN_AT(next_tick);
+	add_timer(&hmp->timer);
+}
+
+static void hamachi_tx_timeout(struct net_device *dev)
+{
+	int i;
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+
+	printk(KERN_WARNING "%s: Hamachi transmit timed out, status %8.8x,"
+		   " resetting...\n", dev->name, (int)readw(ioaddr + TxStatus));
+
+	{
+		printk(KERN_DEBUG "  Rx ring %p: ", hmp->rx_ring);
+		for (i = 0; i < RX_RING_SIZE; i++)
+			printk(KERN_CONT " %8.8x",
+			       le32_to_cpu(hmp->rx_ring[i].status_n_length));
+		printk(KERN_CONT "\n");
+		printk(KERN_DEBUG"  Tx ring %p: ", hmp->tx_ring);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(KERN_CONT " %4.4x",
+			       le32_to_cpu(hmp->tx_ring[i].status_n_length));
+		printk(KERN_CONT "\n");
+	}
+
+	/* Reinit the hardware and make sure the Rx and Tx processes
+		are up and running.
+	 */
+	dev->if_port = 0;
+	/* The right way to do Reset. -KDU
+	 *		-Clear OWN bit in all Rx/Tx descriptors
+	 *		-Wait 50 uS for channels to go idle
+	 *		-Turn off MAC receiver
+	 *		-Issue Reset
+	 */
+
+	for (i = 0; i < RX_RING_SIZE; i++)
+		hmp->rx_ring[i].status_n_length &= cpu_to_le32(~DescOwn);
+
+	/* Presume that all packets in the Tx queue are gone if we have to
+	 * re-init the hardware.
+	 */
+	for (i = 0; i < TX_RING_SIZE; i++){
+		struct sk_buff *skb;
+
+		if (i >= TX_RING_SIZE - 1)
+			hmp->tx_ring[i].status_n_length =
+				cpu_to_le32(DescEndRing) |
+				(hmp->tx_ring[i].status_n_length &
+				 cpu_to_le32(0x0000ffff));
+		else
+			hmp->tx_ring[i].status_n_length &= cpu_to_le32(0x0000ffff);
+		skb = hmp->tx_skbuff[i];
+		if (skb){
+			pci_unmap_single(hmp->pci_dev, leXX_to_cpu(hmp->tx_ring[i].addr),
+				skb->len, PCI_DMA_TODEVICE);
+			dev_kfree_skb(skb);
+			hmp->tx_skbuff[i] = NULL;
+		}
+	}
+
+	udelay(60); /* Sleep 60 us just for safety sake */
+	writew(0x0002, ioaddr + RxCmd); /* STOP Rx */
+
+	writeb(0x01, ioaddr + ChipReset);  /* Reinit the hardware */
+
+	hmp->tx_full = 0;
+	hmp->cur_rx = hmp->cur_tx = 0;
+	hmp->dirty_rx = hmp->dirty_tx = 0;
+	/* Rx packets are also presumed lost; however, we need to make sure a
+	 * ring of buffers is in tact. -KDU
+	 */
+	for (i = 0; i < RX_RING_SIZE; i++){
+		struct sk_buff *skb = hmp->rx_skbuff[i];
+
+		if (skb){
+			pci_unmap_single(hmp->pci_dev,
+				leXX_to_cpu(hmp->rx_ring[i].addr),
+				hmp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+			dev_kfree_skb(skb);
+			hmp->rx_skbuff[i] = NULL;
+		}
+	}
+	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb;
+
+		skb = netdev_alloc_skb_ip_align(dev, hmp->rx_buf_sz);
+		hmp->rx_skbuff[i] = skb;
+		if (skb == NULL)
+			break;
+
+                hmp->rx_ring[i].addr = cpu_to_leXX(pci_map_single(hmp->pci_dev,
+			skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+		hmp->rx_ring[i].status_n_length = cpu_to_le32(DescOwn |
+			DescEndPacket | DescIntr | (hmp->rx_buf_sz - 2));
+	}
+	hmp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
+	/* Mark the last entry as wrapping the ring. */
+	hmp->rx_ring[RX_RING_SIZE-1].status_n_length |= cpu_to_le32(DescEndRing);
+
+	/* Trigger an immediate transmit demand. */
+	dev->trans_start = jiffies; /* prevent tx timeout */
+	dev->stats.tx_errors++;
+
+	/* Restart the chip's Tx/Rx processes . */
+	writew(0x0002, ioaddr + TxCmd); /* STOP Tx */
+	writew(0x0001, ioaddr + TxCmd); /* START Tx */
+	writew(0x0001, ioaddr + RxCmd); /* START Rx */
+
+	netif_wake_queue(dev);
+}
+
+
+/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
+static void hamachi_init_ring(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	int i;
+
+	hmp->tx_full = 0;
+	hmp->cur_rx = hmp->cur_tx = 0;
+	hmp->dirty_rx = hmp->dirty_tx = 0;
+
+	/* +26 gets the maximum ethernet encapsulation, +7 & ~7 because the
+	 * card needs room to do 8 byte alignment, +2 so we can reserve
+	 * the first 2 bytes, and +16 gets room for the status word from the
+	 * card.  -KDU
+	 */
+	hmp->rx_buf_sz = (dev->mtu <= 1492 ? PKT_BUF_SZ :
+		(((dev->mtu+26+7) & ~7) + 16));
+
+	/* Initialize all Rx descriptors. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		hmp->rx_ring[i].status_n_length = 0;
+		hmp->rx_skbuff[i] = NULL;
+	}
+	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz + 2);
+		hmp->rx_skbuff[i] = skb;
+		if (skb == NULL)
+			break;
+		skb->dev = dev;         /* Mark as being used by this device. */
+		skb_reserve(skb, 2); /* 16 byte align the IP header. */
+                hmp->rx_ring[i].addr = cpu_to_leXX(pci_map_single(hmp->pci_dev,
+			skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+		/* -2 because it doesn't REALLY have that first 2 bytes -KDU */
+		hmp->rx_ring[i].status_n_length = cpu_to_le32(DescOwn |
+			DescEndPacket | DescIntr | (hmp->rx_buf_sz -2));
+	}
+	hmp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
+	hmp->rx_ring[RX_RING_SIZE-1].status_n_length |= cpu_to_le32(DescEndRing);
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		hmp->tx_skbuff[i] = NULL;
+		hmp->tx_ring[i].status_n_length = 0;
+	}
+	/* Mark the last entry of the ring */
+	hmp->tx_ring[TX_RING_SIZE-1].status_n_length |= cpu_to_le32(DescEndRing);
+}
+
+
+static netdev_tx_t hamachi_start_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	unsigned entry;
+	u16 status;
+
+	/* Ok, now make sure that the queue has space before trying to
+		add another skbuff.  if we return non-zero the scheduler
+		should interpret this as a queue full and requeue the buffer
+		for later.
+	 */
+	if (hmp->tx_full) {
+		/* We should NEVER reach this point -KDU */
+		printk(KERN_WARNING "%s: Hamachi transmit queue full at slot %d.\n",dev->name, hmp->cur_tx);
+
+		/* Wake the potentially-idle transmit channel. */
+		/* If we don't need to read status, DON'T -KDU */
+		status=readw(hmp->base + TxStatus);
+		if( !(status & 0x0001) || (status & 0x0002))
+			writew(0x0001, hmp->base + TxCmd);
+		return NETDEV_TX_BUSY;
+	}
+
+	/* Caution: the write order is important here, set the field
+	   with the "ownership" bits last. */
+
+	/* Calculate the next Tx descriptor entry. */
+	entry = hmp->cur_tx % TX_RING_SIZE;
+
+	hmp->tx_skbuff[entry] = skb;
+
+        hmp->tx_ring[entry].addr = cpu_to_leXX(pci_map_single(hmp->pci_dev,
+		skb->data, skb->len, PCI_DMA_TODEVICE));
+
+	/* Hmmmm, could probably put a DescIntr on these, but the way
+		the driver is currently coded makes Tx interrupts unnecessary
+		since the clearing of the Tx ring is handled by the start_xmit
+		routine.  This organization helps mitigate the interrupts a
+		bit and probably renders the max_tx_latency param useless.
+
+		Update: Putting a DescIntr bit on all of the descriptors and
+		mitigating interrupt frequency with the tx_min_pkt parameter. -KDU
+	*/
+	if (entry >= TX_RING_SIZE-1)		 /* Wrap ring */
+		hmp->tx_ring[entry].status_n_length = cpu_to_le32(DescOwn |
+			DescEndPacket | DescEndRing | DescIntr | skb->len);
+	else
+		hmp->tx_ring[entry].status_n_length = cpu_to_le32(DescOwn |
+			DescEndPacket | DescIntr | skb->len);
+	hmp->cur_tx++;
+
+	/* Non-x86 Todo: explicitly flush cache lines here. */
+
+	/* Wake the potentially-idle transmit channel. */
+	/* If we don't need to read status, DON'T -KDU */
+	status=readw(hmp->base + TxStatus);
+	if( !(status & 0x0001) || (status & 0x0002))
+		writew(0x0001, hmp->base + TxCmd);
+
+	/* Immediately before returning, let's clear as many entries as we can. */
+	hamachi_tx(dev);
+
+	/* We should kick the bottom half here, since we are not accepting
+	 * interrupts with every packet.  i.e. realize that Gigabit ethernet
+	 * can transmit faster than ordinary machines can load packets;
+	 * hence, any packet that got put off because we were in the transmit
+	 * routine should IMMEDIATELY get a chance to be re-queued. -KDU
+	 */
+	if ((hmp->cur_tx - hmp->dirty_tx) < (TX_RING_SIZE - 4))
+		netif_wake_queue(dev);  /* Typical path */
+	else {
+		hmp->tx_full = 1;
+		netif_stop_queue(dev);
+	}
+
+	if (hamachi_debug > 4) {
+		printk(KERN_DEBUG "%s: Hamachi transmit frame #%d queued in slot %d.\n",
+			   dev->name, hmp->cur_tx, entry);
+	}
+	return NETDEV_TX_OK;
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static irqreturn_t hamachi_interrupt(int irq, void *dev_instance)
+{
+	struct net_device *dev = dev_instance;
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	long boguscnt = max_interrupt_work;
+	int handled = 0;
+
+#ifndef final_version			/* Can never occur. */
+	if (dev == NULL) {
+		printk (KERN_ERR "hamachi_interrupt(): irq %d for unknown device.\n", irq);
+		return IRQ_NONE;
+	}
+#endif
+
+	spin_lock(&hmp->lock);
+
+	do {
+		u32 intr_status = readl(ioaddr + InterruptClear);
+
+		if (hamachi_debug > 4)
+			printk(KERN_DEBUG "%s: Hamachi interrupt, status %4.4x.\n",
+				   dev->name, intr_status);
+
+		if (intr_status == 0)
+			break;
+
+		handled = 1;
+
+		if (intr_status & IntrRxDone)
+			hamachi_rx(dev);
+
+		if (intr_status & IntrTxDone){
+			/* This code should RARELY need to execute. After all, this is
+			 * a gigabit link, it should consume packets as fast as we put
+			 * them in AND we clear the Tx ring in hamachi_start_xmit().
+			 */
+			if (hmp->tx_full){
+				for (; hmp->cur_tx - hmp->dirty_tx > 0; hmp->dirty_tx++){
+					int entry = hmp->dirty_tx % TX_RING_SIZE;
+					struct sk_buff *skb;
+
+					if (hmp->tx_ring[entry].status_n_length & cpu_to_le32(DescOwn))
+						break;
+					skb = hmp->tx_skbuff[entry];
+					/* Free the original skb. */
+					if (skb){
+						pci_unmap_single(hmp->pci_dev,
+							leXX_to_cpu(hmp->tx_ring[entry].addr),
+							skb->len,
+							PCI_DMA_TODEVICE);
+						dev_kfree_skb_irq(skb);
+						hmp->tx_skbuff[entry] = NULL;
+					}
+					hmp->tx_ring[entry].status_n_length = 0;
+					if (entry >= TX_RING_SIZE-1)
+						hmp->tx_ring[TX_RING_SIZE-1].status_n_length |=
+							cpu_to_le32(DescEndRing);
+					dev->stats.tx_packets++;
+				}
+				if (hmp->cur_tx - hmp->dirty_tx < TX_RING_SIZE - 4){
+					/* The ring is no longer full */
+					hmp->tx_full = 0;
+					netif_wake_queue(dev);
+				}
+			} else {
+				netif_wake_queue(dev);
+			}
+		}
+
+
+		/* Abnormal error summary/uncommon events handlers. */
+		if (intr_status &
+			(IntrTxPCIFault | IntrTxPCIErr | IntrRxPCIFault | IntrRxPCIErr |
+			 LinkChange | NegotiationChange | StatsMax))
+			hamachi_error(dev, intr_status);
+
+		if (--boguscnt < 0) {
+			printk(KERN_WARNING "%s: Too much work at interrupt, status=0x%4.4x.\n",
+				   dev->name, intr_status);
+			break;
+		}
+	} while (1);
+
+	if (hamachi_debug > 3)
+		printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
+			   dev->name, readl(ioaddr + IntrStatus));
+
+#ifndef final_version
+	/* Code that should never be run!  Perhaps remove after testing.. */
+	{
+		static int stopit = 10;
+		if (dev->start == 0  &&  --stopit < 0) {
+			printk(KERN_ERR "%s: Emergency stop, looping startup interrupt.\n",
+				   dev->name);
+			free_irq(irq, dev);
+		}
+	}
+#endif
+
+	spin_unlock(&hmp->lock);
+	return IRQ_RETVAL(handled);
+}
+
+/* This routine is logically part of the interrupt handler, but separated
+   for clarity and better register allocation. */
+static int hamachi_rx(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	int entry = hmp->cur_rx % RX_RING_SIZE;
+	int boguscnt = (hmp->dirty_rx + RX_RING_SIZE) - hmp->cur_rx;
+
+	if (hamachi_debug > 4) {
+		printk(KERN_DEBUG " In hamachi_rx(), entry %d status %4.4x.\n",
+			   entry, hmp->rx_ring[entry].status_n_length);
+	}
+
+	/* If EOP is set on the next entry, it's a new packet. Send it up. */
+	while (1) {
+		struct hamachi_desc *desc = &(hmp->rx_ring[entry]);
+		u32 desc_status = le32_to_cpu(desc->status_n_length);
+		u16 data_size = desc_status;	/* Implicit truncate */
+		u8 *buf_addr;
+		s32 frame_status;
+
+		if (desc_status & DescOwn)
+			break;
+		pci_dma_sync_single_for_cpu(hmp->pci_dev,
+					    leXX_to_cpu(desc->addr),
+					    hmp->rx_buf_sz,
+					    PCI_DMA_FROMDEVICE);
+		buf_addr = (u8 *) hmp->rx_skbuff[entry]->data;
+		frame_status = get_unaligned_le32(&(buf_addr[data_size - 12]));
+		if (hamachi_debug > 4)
+			printk(KERN_DEBUG "  hamachi_rx() status was %8.8x.\n",
+				frame_status);
+		if (--boguscnt < 0)
+			break;
+		if ( ! (desc_status & DescEndPacket)) {
+			printk(KERN_WARNING "%s: Oversized Ethernet frame spanned "
+				   "multiple buffers, entry %#x length %d status %4.4x!\n",
+				   dev->name, hmp->cur_rx, data_size, desc_status);
+			printk(KERN_WARNING "%s: Oversized Ethernet frame %p vs %p.\n",
+				   dev->name, desc, &hmp->rx_ring[hmp->cur_rx % RX_RING_SIZE]);
+			printk(KERN_WARNING "%s: Oversized Ethernet frame -- next status %x/%x last status %x.\n",
+				   dev->name,
+				   le32_to_cpu(hmp->rx_ring[(hmp->cur_rx+1) % RX_RING_SIZE].status_n_length) & 0xffff0000,
+				   le32_to_cpu(hmp->rx_ring[(hmp->cur_rx+1) % RX_RING_SIZE].status_n_length) & 0x0000ffff,
+				   le32_to_cpu(hmp->rx_ring[(hmp->cur_rx-1) % RX_RING_SIZE].status_n_length));
+			dev->stats.rx_length_errors++;
+		} /* else  Omit for prototype errata??? */
+		if (frame_status & 0x00380000) {
+			/* There was an error. */
+			if (hamachi_debug > 2)
+				printk(KERN_DEBUG "  hamachi_rx() Rx error was %8.8x.\n",
+					   frame_status);
+			dev->stats.rx_errors++;
+			if (frame_status & 0x00600000)
+				dev->stats.rx_length_errors++;
+			if (frame_status & 0x00080000)
+				dev->stats.rx_frame_errors++;
+			if (frame_status & 0x00100000)
+				dev->stats.rx_crc_errors++;
+			if (frame_status < 0)
+				dev->stats.rx_dropped++;
+		} else {
+			struct sk_buff *skb;
+			/* Omit CRC */
+			u16 pkt_len = (frame_status & 0x07ff) - 4;
+#ifdef RX_CHECKSUM
+			u32 pfck = *(u32 *) &buf_addr[data_size - 8];
+#endif
+
+
+#ifndef final_version
+			if (hamachi_debug > 4)
+				printk(KERN_DEBUG "  hamachi_rx() normal Rx pkt length %d"
+					   " of %d, bogus_cnt %d.\n",
+					   pkt_len, data_size, boguscnt);
+			if (hamachi_debug > 5)
+				printk(KERN_DEBUG"%s:  rx status %8.8x %8.8x %8.8x %8.8x %8.8x.\n",
+					   dev->name,
+					   *(s32*)&(buf_addr[data_size - 20]),
+					   *(s32*)&(buf_addr[data_size - 16]),
+					   *(s32*)&(buf_addr[data_size - 12]),
+					   *(s32*)&(buf_addr[data_size - 8]),
+					   *(s32*)&(buf_addr[data_size - 4]));
+#endif
+			/* Check if the packet is long enough to accept without copying
+			   to a minimally-sized skbuff. */
+			if (pkt_len < rx_copybreak &&
+			    (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
+#ifdef RX_CHECKSUM
+				printk(KERN_ERR "%s: rx_copybreak non-zero "
+				  "not good with RX_CHECKSUM\n", dev->name);
+#endif
+				skb_reserve(skb, 2);	/* 16 byte align the IP header */
+				pci_dma_sync_single_for_cpu(hmp->pci_dev,
+							    leXX_to_cpu(hmp->rx_ring[entry].addr),
+							    hmp->rx_buf_sz,
+							    PCI_DMA_FROMDEVICE);
+				/* Call copy + cksum if available. */
+#if 1 || USE_IP_COPYSUM
+				skb_copy_to_linear_data(skb,
+					hmp->rx_skbuff[entry]->data, pkt_len);
+				skb_put(skb, pkt_len);
+#else
+				memcpy(skb_put(skb, pkt_len), hmp->rx_ring_dma
+					+ entry*sizeof(*desc), pkt_len);
+#endif
+				pci_dma_sync_single_for_device(hmp->pci_dev,
+							       leXX_to_cpu(hmp->rx_ring[entry].addr),
+							       hmp->rx_buf_sz,
+							       PCI_DMA_FROMDEVICE);
+			} else {
+				pci_unmap_single(hmp->pci_dev,
+						 leXX_to_cpu(hmp->rx_ring[entry].addr),
+						 hmp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+				skb_put(skb = hmp->rx_skbuff[entry], pkt_len);
+				hmp->rx_skbuff[entry] = NULL;
+			}
+			skb->protocol = eth_type_trans(skb, dev);
+
+
+#ifdef RX_CHECKSUM
+			/* TCP or UDP on ipv4, DIX encoding */
+			if (pfck>>24 == 0x91 || pfck>>24 == 0x51) {
+				struct iphdr *ih = (struct iphdr *) skb->data;
+				/* Check that IP packet is at least 46 bytes, otherwise,
+				 * there may be pad bytes included in the hardware checksum.
+				 * This wouldn't happen if everyone padded with 0.
+				 */
+				if (ntohs(ih->tot_len) >= 46){
+					/* don't worry about frags */
+					if (!(ih->frag_off & cpu_to_be16(IP_MF|IP_OFFSET))) {
+						u32 inv = *(u32 *) &buf_addr[data_size - 16];
+						u32 *p = (u32 *) &buf_addr[data_size - 20];
+						register u32 crc, p_r, p_r1;
+
+						if (inv & 4) {
+							inv &= ~4;
+							--p;
+						}
+						p_r = *p;
+						p_r1 = *(p-1);
+						switch (inv) {
+							case 0:
+								crc = (p_r & 0xffff) + (p_r >> 16);
+								break;
+							case 1:
+								crc = (p_r >> 16) + (p_r & 0xffff)
+									+ (p_r1 >> 16 & 0xff00);
+								break;
+							case 2:
+								crc = p_r + (p_r1 >> 16);
+								break;
+							case 3:
+								crc = p_r + (p_r1 & 0xff00) + (p_r1 >> 16);
+								break;
+							default:	/*NOTREACHED*/ crc = 0;
+						}
+						if (crc & 0xffff0000) {
+							crc &= 0xffff;
+							++crc;
+						}
+						/* tcp/udp will add in pseudo */
+						skb->csum = ntohs(pfck & 0xffff);
+						if (skb->csum > crc)
+							skb->csum -= crc;
+						else
+							skb->csum += (~crc & 0xffff);
+						/*
+						* could do the pseudo myself and return
+						* CHECKSUM_UNNECESSARY
+						*/
+						skb->ip_summed = CHECKSUM_COMPLETE;
+					}
+				}
+			}
+#endif  /* RX_CHECKSUM */
+
+			netif_rx(skb);
+			dev->stats.rx_packets++;
+		}
+		entry = (++hmp->cur_rx) % RX_RING_SIZE;
+	}
+
+	/* Refill the Rx ring buffers. */
+	for (; hmp->cur_rx - hmp->dirty_rx > 0; hmp->dirty_rx++) {
+		struct hamachi_desc *desc;
+
+		entry = hmp->dirty_rx % RX_RING_SIZE;
+		desc = &(hmp->rx_ring[entry]);
+		if (hmp->rx_skbuff[entry] == NULL) {
+			struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz + 2);
+
+			hmp->rx_skbuff[entry] = skb;
+			if (skb == NULL)
+				break;		/* Better luck next round. */
+			skb->dev = dev;		/* Mark as being used by this device. */
+			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
+                	desc->addr = cpu_to_leXX(pci_map_single(hmp->pci_dev,
+				skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+		}
+		desc->status_n_length = cpu_to_le32(hmp->rx_buf_sz);
+		if (entry >= RX_RING_SIZE-1)
+			desc->status_n_length |= cpu_to_le32(DescOwn |
+				DescEndPacket | DescEndRing | DescIntr);
+		else
+			desc->status_n_length |= cpu_to_le32(DescOwn |
+				DescEndPacket | DescIntr);
+	}
+
+	/* Restart Rx engine if stopped. */
+	/* If we don't need to check status, don't. -KDU */
+	if (readw(hmp->base + RxStatus) & 0x0002)
+		writew(0x0001, hmp->base + RxCmd);
+
+	return 0;
+}
+
+/* This is more properly named "uncommon interrupt events", as it covers more
+   than just errors. */
+static void hamachi_error(struct net_device *dev, int intr_status)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+
+	if (intr_status & (LinkChange|NegotiationChange)) {
+		if (hamachi_debug > 1)
+			printk(KERN_INFO "%s: Link changed: AutoNegotiation Ctrl"
+				   " %4.4x, Status %4.4x %4.4x Intr status %4.4x.\n",
+				   dev->name, readw(ioaddr + 0x0E0), readw(ioaddr + 0x0E2),
+				   readw(ioaddr + ANLinkPartnerAbility),
+				   readl(ioaddr + IntrStatus));
+		if (readw(ioaddr + ANStatus) & 0x20)
+			writeb(0x01, ioaddr + LEDCtrl);
+		else
+			writeb(0x03, ioaddr + LEDCtrl);
+	}
+	if (intr_status & StatsMax) {
+		hamachi_get_stats(dev);
+		/* Read the overflow bits to clear. */
+		readl(ioaddr + 0x370);
+		readl(ioaddr + 0x3F0);
+	}
+	if ((intr_status & ~(LinkChange|StatsMax|NegotiationChange|IntrRxDone|IntrTxDone)) &&
+	    hamachi_debug)
+		printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
+		       dev->name, intr_status);
+	/* Hmmmmm, it's not clear how to recover from PCI faults. */
+	if (intr_status & (IntrTxPCIErr | IntrTxPCIFault))
+		dev->stats.tx_fifo_errors++;
+	if (intr_status & (IntrRxPCIErr | IntrRxPCIFault))
+		dev->stats.rx_fifo_errors++;
+}
+
+static int hamachi_close(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+	struct sk_buff *skb;
+	int i;
+
+	netif_stop_queue(dev);
+
+	if (hamachi_debug > 1) {
+		printk(KERN_DEBUG "%s: Shutting down ethercard, status was Tx %4.4x Rx %4.4x Int %2.2x.\n",
+			   dev->name, readw(ioaddr + TxStatus),
+			   readw(ioaddr + RxStatus), readl(ioaddr + IntrStatus));
+		printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
+			   dev->name, hmp->cur_tx, hmp->dirty_tx, hmp->cur_rx, hmp->dirty_rx);
+	}
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	writel(0x0000, ioaddr + InterruptEnable);
+
+	/* Stop the chip's Tx and Rx processes. */
+	writel(2, ioaddr + RxCmd);
+	writew(2, ioaddr + TxCmd);
+
+#ifdef __i386__
+	if (hamachi_debug > 2) {
+		printk(KERN_DEBUG "  Tx ring at %8.8x:\n",
+			   (int)hmp->tx_ring_dma);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(KERN_DEBUG " %c #%d desc. %8.8x %8.8x.\n",
+				   readl(ioaddr + TxCurPtr) == (long)&hmp->tx_ring[i] ? '>' : ' ',
+				   i, hmp->tx_ring[i].status_n_length, hmp->tx_ring[i].addr);
+		printk(KERN_DEBUG "  Rx ring %8.8x:\n",
+			   (int)hmp->rx_ring_dma);
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			printk(KERN_DEBUG " %c #%d desc. %4.4x %8.8x\n",
+				   readl(ioaddr + RxCurPtr) == (long)&hmp->rx_ring[i] ? '>' : ' ',
+				   i, hmp->rx_ring[i].status_n_length, hmp->rx_ring[i].addr);
+			if (hamachi_debug > 6) {
+				if (*(u8*)hmp->rx_skbuff[i]->data != 0x69) {
+					u16 *addr = (u16 *)
+						hmp->rx_skbuff[i]->data;
+					int j;
+					printk(KERN_DEBUG "Addr: ");
+					for (j = 0; j < 0x50; j++)
+						printk(" %4.4x", addr[j]);
+					printk("\n");
+				}
+			}
+		}
+	}
+#endif /* __i386__ debugging only */
+
+	free_irq(dev->irq, dev);
+
+	del_timer_sync(&hmp->timer);
+
+	/* Free all the skbuffs in the Rx queue. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		skb = hmp->rx_skbuff[i];
+		hmp->rx_ring[i].status_n_length = 0;
+		if (skb) {
+			pci_unmap_single(hmp->pci_dev,
+				leXX_to_cpu(hmp->rx_ring[i].addr),
+				hmp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+			dev_kfree_skb(skb);
+			hmp->rx_skbuff[i] = NULL;
+		}
+		hmp->rx_ring[i].addr = cpu_to_leXX(0xBADF00D0); /* An invalid address. */
+	}
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		skb = hmp->tx_skbuff[i];
+		if (skb) {
+			pci_unmap_single(hmp->pci_dev,
+				leXX_to_cpu(hmp->tx_ring[i].addr),
+				skb->len, PCI_DMA_TODEVICE);
+			dev_kfree_skb(skb);
+			hmp->tx_skbuff[i] = NULL;
+		}
+	}
+
+	writeb(0x00, ioaddr + LEDCtrl);
+
+	return 0;
+}
+
+static struct net_device_stats *hamachi_get_stats(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+
+	/* We should lock this segment of code for SMP eventually, although
+	   the vulnerability window is very small and statistics are
+	   non-critical. */
+        /* Ok, what goes here?  This appears to be stuck at 21 packets
+           according to ifconfig.  It does get incremented in hamachi_tx(),
+           so I think I'll comment it out here and see if better things
+           happen.
+        */
+	/* dev->stats.tx_packets	= readl(ioaddr + 0x000); */
+
+	/* Total Uni+Brd+Multi */
+	dev->stats.rx_bytes = readl(ioaddr + 0x330);
+	/* Total Uni+Brd+Multi */
+	dev->stats.tx_bytes = readl(ioaddr + 0x3B0);
+	/* Multicast Rx */
+	dev->stats.multicast = readl(ioaddr + 0x320);
+
+	/* Over+Undersized */
+	dev->stats.rx_length_errors = readl(ioaddr + 0x368);
+	/* Jabber */
+	dev->stats.rx_over_errors = readl(ioaddr + 0x35C);
+	/* Jabber */
+	dev->stats.rx_crc_errors = readl(ioaddr + 0x360);
+	/* Symbol Errs */
+	dev->stats.rx_frame_errors = readl(ioaddr + 0x364);
+	/* Dropped */
+	dev->stats.rx_missed_errors = readl(ioaddr + 0x36C);
+
+	return &dev->stats;
+}
+
+static void set_rx_mode(struct net_device *dev)
+{
+	struct hamachi_private *hmp = netdev_priv(dev);
+	void __iomem *ioaddr = hmp->base;
+
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
+		writew(0x000F, ioaddr + AddrMode);
+	} else if ((netdev_mc_count(dev) > 63) || (dev->flags & IFF_ALLMULTI)) {
+		/* Too many to match, or accept all multicasts. */
+		writew(0x000B, ioaddr + AddrMode);
+	} else if (!netdev_mc_empty(dev)) { /* Must use the CAM filter. */
+		struct netdev_hw_addr *ha;
+		int i = 0;
+
+		netdev_for_each_mc_addr(ha, dev) {
+			writel(*(u32 *)(ha->addr), ioaddr + 0x100 + i*8);
+			writel(0x20000 | (*(u16 *)&ha->addr[4]),
+				   ioaddr + 0x104 + i*8);
+			i++;
+		}
+		/* Clear remaining entries. */
+		for (; i < 64; i++)
+			writel(0, ioaddr + 0x104 + i*8);
+		writew(0x0003, ioaddr + AddrMode);
+	} else {					/* Normal, unicast/broadcast-only mode. */
+		writew(0x0001, ioaddr + AddrMode);
+	}
+}
+
+static int check_if_running(struct net_device *dev)
+{
+	if (!netif_running(dev))
+		return -EINVAL;
+	return 0;
+}
+
+static void hamachi_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	strcpy(info->driver, DRV_NAME);
+	strcpy(info->version, DRV_VERSION);
+	strcpy(info->bus_info, pci_name(np->pci_dev));
+}
+
+static int hamachi_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	spin_lock_irq(&np->lock);
+	mii_ethtool_gset(&np->mii_if, ecmd);
+	spin_unlock_irq(&np->lock);
+	return 0;
+}
+
+static int hamachi_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	int res;
+	spin_lock_irq(&np->lock);
+	res = mii_ethtool_sset(&np->mii_if, ecmd);
+	spin_unlock_irq(&np->lock);
+	return res;
+}
+
+static int hamachi_nway_reset(struct net_device *dev)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	return mii_nway_restart(&np->mii_if);
+}
+
+static u32 hamachi_get_link(struct net_device *dev)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	return mii_link_ok(&np->mii_if);
+}
+
+static const struct ethtool_ops ethtool_ops = {
+	.begin = check_if_running,
+	.get_drvinfo = hamachi_get_drvinfo,
+	.get_settings = hamachi_get_settings,
+	.set_settings = hamachi_set_settings,
+	.nway_reset = hamachi_nway_reset,
+	.get_link = hamachi_get_link,
+};
+
+static const struct ethtool_ops ethtool_ops_no_mii = {
+	.begin = check_if_running,
+	.get_drvinfo = hamachi_get_drvinfo,
+};
+
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct hamachi_private *np = netdev_priv(dev);
+	struct mii_ioctl_data *data = if_mii(rq);
+	int rc;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	if (cmd == (SIOCDEVPRIVATE+3)) { /* set rx,tx intr params */
+		u32 *d = (u32 *)&rq->ifr_ifru;
+		/* Should add this check here or an ordinary user can do nasty
+		 * things. -KDU
+		 *
+		 * TODO: Shut down the Rx and Tx engines while doing this.
+		 */
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		writel(d[0], np->base + TxIntrCtrl);
+		writel(d[1], np->base + RxIntrCtrl);
+		printk(KERN_NOTICE "%s: tx %08x, rx %08x intr\n", dev->name,
+		  (u32) readl(np->base + TxIntrCtrl),
+		  (u32) readl(np->base + RxIntrCtrl));
+		rc = 0;
+	}
+
+	else {
+		spin_lock_irq(&np->lock);
+		rc = generic_mii_ioctl(&np->mii_if, data, cmd, NULL);
+		spin_unlock_irq(&np->lock);
+	}
+
+	return rc;
+}
+
+
+static void __devexit hamachi_remove_one (struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+
+	if (dev) {
+		struct hamachi_private *hmp = netdev_priv(dev);
+
+		pci_free_consistent(pdev, RX_TOTAL_SIZE, hmp->rx_ring,
+			hmp->rx_ring_dma);
+		pci_free_consistent(pdev, TX_TOTAL_SIZE, hmp->tx_ring,
+			hmp->tx_ring_dma);
+		unregister_netdev(dev);
+		iounmap(hmp->base);
+		free_netdev(dev);
+		pci_release_regions(pdev);
+		pci_set_drvdata(pdev, NULL);
+	}
+}
+
+static DEFINE_PCI_DEVICE_TABLE(hamachi_pci_tbl) = {
+	{ 0x1318, 0x0911, PCI_ANY_ID, PCI_ANY_ID, },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, hamachi_pci_tbl);
+
+static struct pci_driver hamachi_driver = {
+	.name		= DRV_NAME,
+	.id_table	= hamachi_pci_tbl,
+	.probe		= hamachi_init_one,
+	.remove		= __devexit_p(hamachi_remove_one),
+};
+
+static int __init hamachi_init (void)
+{
+/* when a module, this is printed whether or not devices are found in probe */
+#ifdef MODULE
+	printk(version);
+#endif
+	return pci_register_driver(&hamachi_driver);
+}
+
+static void __exit hamachi_exit (void)
+{
+	pci_unregister_driver(&hamachi_driver);
+}
+
+
+module_init(hamachi_init);
+module_exit(hamachi_exit);
diff --git a/drivers/net/ethernet/packetengines/yellowfin.c b/drivers/net/ethernet/packetengines/yellowfin.c
new file mode 100644
index 000000000000..3e5ac60b89ac
--- /dev/null
+++ b/drivers/net/ethernet/packetengines/yellowfin.c
@@ -0,0 +1,1430 @@
+/* yellowfin.c: A Packet Engines G-NIC ethernet driver for linux. */
+/*
+	Written 1997-2001 by Donald Becker.
+
+	This software may be used and distributed according to the terms of
+	the GNU General Public License (GPL), incorporated herein by reference.
+	Drivers based on or derived from this code fall under the GPL and must
+	retain the authorship, copyright and license notice.  This file is not
+	a complete program and may only be used when the entire operating
+	system is licensed under the GPL.
+
+	This driver is for the Packet Engines G-NIC PCI Gigabit Ethernet adapter.
+	It also supports the Symbios Logic version of the same chip core.
+
+	The author may be reached as becker@scyld.com, or C/O
+	Scyld Computing Corporation
+	410 Severn Ave., Suite 210
+	Annapolis MD 21403
+
+	Support and updates available at
+	http://www.scyld.com/network/yellowfin.html
+	[link no longer provides useful info -jgarzik]
+
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DRV_NAME	"yellowfin"
+#define DRV_VERSION	"2.1"
+#define DRV_RELDATE	"Sep 11, 2006"
+
+/* The user-configurable values.
+   These may be modified when a driver module is loaded.*/
+
+static int debug = 1;			/* 1 normal messages, 0 quiet .. 7 verbose. */
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 20;
+static int mtu;
+#ifdef YF_PROTOTYPE			/* Support for prototype hardware errata. */
+/* System-wide count of bogus-rx frames. */
+static int bogus_rx;
+static int dma_ctrl = 0x004A0263; 			/* Constrained by errata */
+static int fifo_cfg = 0x0020;				/* Bypass external Tx FIFO. */
+#elif defined(YF_NEW)					/* A future perfect board :->.  */
+static int dma_ctrl = 0x00CAC277;			/* Override when loading module! */
+static int fifo_cfg = 0x0028;
+#else
+static const int dma_ctrl = 0x004A0263; 			/* Constrained by errata */
+static const int fifo_cfg = 0x0020;				/* Bypass external Tx FIFO. */
+#endif
+
+/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
+   Setting to > 1514 effectively disables this feature. */
+static int rx_copybreak;
+
+/* Used to pass the media type, etc.
+   No media types are currently defined.  These exist for driver
+   interoperability.
+*/
+#define MAX_UNITS 8				/* More are supported, limit only on options */
+static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+/* Do ugly workaround for GX server chipset errata. */
+static int gx_fix;
+
+/* Operational parameters that are set at compile time. */
+
+/* Keep the ring sizes a power of two for efficiency.
+   Making the Tx ring too long decreases the effectiveness of channel
+   bonding and packet priority.
+   There are no ill effects from too-large receive rings. */
+#define TX_RING_SIZE	16
+#define TX_QUEUE_SIZE	12		/* Must be > 4 && <= TX_RING_SIZE */
+#define RX_RING_SIZE	64
+#define STATUS_TOTAL_SIZE	TX_RING_SIZE*sizeof(struct tx_status_words)
+#define TX_TOTAL_SIZE		2*TX_RING_SIZE*sizeof(struct yellowfin_desc)
+#define RX_TOTAL_SIZE		RX_RING_SIZE*sizeof(struct yellowfin_desc)
+
+/* Operational parameters that usually are not changed. */
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (2*HZ)
+#define PKT_BUF_SZ		1536			/* Size of each temporary Rx buffer.*/
+
+#define yellowfin_debug debug
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/mii.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/crc32.h>
+#include <linux/bitops.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>		/* Processor type for cache alignment. */
+#include <asm/unaligned.h>
+#include <asm/io.h>
+
+/* These identify the driver base version and may not be removed. */
+static const char version[] __devinitconst =
+  KERN_INFO DRV_NAME ".c:v1.05  1/09/2001  Written by Donald Becker <becker@scyld.com>\n"
+  "  (unofficial 2.4.x port, " DRV_VERSION ", " DRV_RELDATE ")\n";
+
+MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
+MODULE_DESCRIPTION("Packet Engines Yellowfin G-NIC Gigabit Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_param(max_interrupt_work, int, 0);
+module_param(mtu, int, 0);
+module_param(debug, int, 0);
+module_param(rx_copybreak, int, 0);
+module_param_array(options, int, NULL, 0);
+module_param_array(full_duplex, int, NULL, 0);
+module_param(gx_fix, int, 0);
+MODULE_PARM_DESC(max_interrupt_work, "G-NIC maximum events handled per interrupt");
+MODULE_PARM_DESC(mtu, "G-NIC MTU (all boards)");
+MODULE_PARM_DESC(debug, "G-NIC debug level (0-7)");
+MODULE_PARM_DESC(rx_copybreak, "G-NIC copy breakpoint for copy-only-tiny-frames");
+MODULE_PARM_DESC(options, "G-NIC: Bits 0-3: media type, bit 17: full duplex");
+MODULE_PARM_DESC(full_duplex, "G-NIC full duplex setting(s) (1)");
+MODULE_PARM_DESC(gx_fix, "G-NIC: enable GX server chipset bug workaround (0-1)");
+
+/*
+				Theory of Operation
+
+I. Board Compatibility
+
+This device driver is designed for the Packet Engines "Yellowfin" Gigabit
+Ethernet adapter.  The G-NIC 64-bit PCI card is supported, as well as the
+Symbios 53C885E dual function chip.
+
+II. Board-specific settings
+
+PCI bus devices are configured by the system at boot time, so no jumpers
+need to be set on the board.  The system BIOS preferably should assign the
+PCI INTA signal to an otherwise unused system IRQ line.
+Note: Kernel versions earlier than 1.3.73 do not support shared PCI
+interrupt lines.
+
+III. Driver operation
+
+IIIa. Ring buffers
+
+The Yellowfin uses the Descriptor Based DMA Architecture specified by Apple.
+This is a descriptor list scheme similar to that used by the EEPro100 and
+Tulip.  This driver uses two statically allocated fixed-size descriptor lists
+formed into rings by a branch from the final descriptor to the beginning of
+the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
+
+The driver allocates full frame size skbuffs for the Rx ring buffers at
+open() time and passes the skb->data field to the Yellowfin as receive data
+buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
+a fresh skbuff is allocated and the frame is copied to the new skbuff.
+When the incoming frame is larger, the skbuff is passed directly up the
+protocol stack and replaced by a newly allocated skbuff.
+
+The RX_COPYBREAK value is chosen to trade-off the memory wasted by
+using a full-sized skbuff for small frames vs. the copying costs of larger
+frames.  For small frames the copying cost is negligible (esp. considering
+that we are pre-loading the cache with immediately useful header
+information).  For large frames the copying cost is non-trivial, and the
+larger copy might flush the cache of useful data.
+
+IIIC. Synchronization
+
+The driver runs as two independent, single-threaded flows of control.  One
+is the send-packet routine, which enforces single-threaded use by the
+dev->tbusy flag.  The other thread is the interrupt handler, which is single
+threaded by the hardware and other software.
+
+The send packet thread has partial control over the Tx ring and 'dev->tbusy'
+flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
+queue slot is empty, it clears the tbusy flag when finished otherwise it sets
+the 'yp->tx_full' flag.
+
+The interrupt handler has exclusive control over the Rx ring and records stats
+from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
+empty by incrementing the dirty_tx mark. Iff the 'yp->tx_full' flag is set, it
+clears both the tx_full and tbusy flags.
+
+IV. Notes
+
+Thanks to Kim Stearns of Packet Engines for providing a pair of G-NIC boards.
+Thanks to Bruce Faust of Digitalscape for providing both their SYM53C885 board
+and an AlphaStation to verifty the Alpha port!
+
+IVb. References
+
+Yellowfin Engineering Design Specification, 4/23/97 Preliminary/Confidential
+Symbios SYM53C885 PCI-SCSI/Fast Ethernet Multifunction Controller Preliminary
+   Data Manual v3.0
+http://cesdis.gsfc.nasa.gov/linux/misc/NWay.html
+http://cesdis.gsfc.nasa.gov/linux/misc/100mbps.html
+
+IVc. Errata
+
+See Packet Engines confidential appendix (prototype chips only).
+*/
+
+
+
+enum capability_flags {
+	HasMII=1, FullTxStatus=2, IsGigabit=4, HasMulticastBug=8, FullRxStatus=16,
+	HasMACAddrBug=32, /* Only on early revs.  */
+	DontUseEeprom=64, /* Don't read the MAC from the EEPROm. */
+};
+
+/* The PCI I/O space extent. */
+enum {
+	YELLOWFIN_SIZE	= 0x100,
+};
+
+struct pci_id_info {
+        const char *name;
+        struct match_info {
+                int     pci, pci_mask, subsystem, subsystem_mask;
+                int revision, revision_mask;                            /* Only 8 bits. */
+        } id;
+        int drv_flags;                          /* Driver use, intended as capability flags. */
+};
+
+static const struct pci_id_info pci_id_tbl[] = {
+	{"Yellowfin G-NIC Gigabit Ethernet", { 0x07021000, 0xffffffff},
+	 FullTxStatus | IsGigabit | HasMulticastBug | HasMACAddrBug | DontUseEeprom},
+	{"Symbios SYM83C885", { 0x07011000, 0xffffffff},
+	  HasMII | DontUseEeprom },
+	{ }
+};
+
+static DEFINE_PCI_DEVICE_TABLE(yellowfin_pci_tbl) = {
+	{ 0x1000, 0x0702, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ 0x1000, 0x0701, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1 },
+	{ }
+};
+MODULE_DEVICE_TABLE (pci, yellowfin_pci_tbl);
+
+
+/* Offsets to the Yellowfin registers.  Various sizes and alignments. */
+enum yellowfin_offsets {
+	TxCtrl=0x00, TxStatus=0x04, TxPtr=0x0C,
+	TxIntrSel=0x10, TxBranchSel=0x14, TxWaitSel=0x18,
+	RxCtrl=0x40, RxStatus=0x44, RxPtr=0x4C,
+	RxIntrSel=0x50, RxBranchSel=0x54, RxWaitSel=0x58,
+	EventStatus=0x80, IntrEnb=0x82, IntrClear=0x84, IntrStatus=0x86,
+	ChipRev=0x8C, DMACtrl=0x90, TxThreshold=0x94,
+	Cnfg=0xA0, FrameGap0=0xA2, FrameGap1=0xA4,
+	MII_Cmd=0xA6, MII_Addr=0xA8, MII_Wr_Data=0xAA, MII_Rd_Data=0xAC,
+	MII_Status=0xAE,
+	RxDepth=0xB8, FlowCtrl=0xBC,
+	AddrMode=0xD0, StnAddr=0xD2, HashTbl=0xD8, FIFOcfg=0xF8,
+	EEStatus=0xF0, EECtrl=0xF1, EEAddr=0xF2, EERead=0xF3, EEWrite=0xF4,
+	EEFeature=0xF5,
+};
+
+/* The Yellowfin Rx and Tx buffer descriptors.
+   Elements are written as 32 bit for endian portability. */
+struct yellowfin_desc {
+	__le32 dbdma_cmd;
+	__le32 addr;
+	__le32 branch_addr;
+	__le32 result_status;
+};
+
+struct tx_status_words {
+#ifdef __BIG_ENDIAN
+	u16 tx_errs;
+	u16 tx_cnt;
+	u16 paused;
+	u16 total_tx_cnt;
+#else  /* Little endian chips. */
+	u16 tx_cnt;
+	u16 tx_errs;
+	u16 total_tx_cnt;
+	u16 paused;
+#endif /* __BIG_ENDIAN */
+};
+
+/* Bits in yellowfin_desc.cmd */
+enum desc_cmd_bits {
+	CMD_TX_PKT=0x10000000, CMD_RX_BUF=0x20000000, CMD_TXSTATUS=0x30000000,
+	CMD_NOP=0x60000000, CMD_STOP=0x70000000,
+	BRANCH_ALWAYS=0x0C0000, INTR_ALWAYS=0x300000, WAIT_ALWAYS=0x030000,
+	BRANCH_IFTRUE=0x040000,
+};
+
+/* Bits in yellowfin_desc.status */
+enum desc_status_bits { RX_EOP=0x0040, };
+
+/* Bits in the interrupt status/mask registers. */
+enum intr_status_bits {
+	IntrRxDone=0x01, IntrRxInvalid=0x02, IntrRxPCIFault=0x04,IntrRxPCIErr=0x08,
+	IntrTxDone=0x10, IntrTxInvalid=0x20, IntrTxPCIFault=0x40,IntrTxPCIErr=0x80,
+	IntrEarlyRx=0x100, IntrWakeup=0x200, };
+
+#define PRIV_ALIGN	31 	/* Required alignment mask */
+#define MII_CNT		4
+struct yellowfin_private {
+	/* Descriptor rings first for alignment.
+	   Tx requires a second descriptor for status. */
+	struct yellowfin_desc *rx_ring;
+	struct yellowfin_desc *tx_ring;
+	struct sk_buff* rx_skbuff[RX_RING_SIZE];
+	struct sk_buff* tx_skbuff[TX_RING_SIZE];
+	dma_addr_t rx_ring_dma;
+	dma_addr_t tx_ring_dma;
+
+	struct tx_status_words *tx_status;
+	dma_addr_t tx_status_dma;
+
+	struct timer_list timer;	/* Media selection timer. */
+	/* Frequently used and paired value: keep adjacent for cache effect. */
+	int chip_id, drv_flags;
+	struct pci_dev *pci_dev;
+	unsigned int cur_rx, dirty_rx;		/* Producer/consumer ring indices */
+	unsigned int rx_buf_sz;				/* Based on MTU+slack. */
+	struct tx_status_words *tx_tail_desc;
+	unsigned int cur_tx, dirty_tx;
+	int tx_threshold;
+	unsigned int tx_full:1;				/* The Tx queue is full. */
+	unsigned int full_duplex:1;			/* Full-duplex operation requested. */
+	unsigned int duplex_lock:1;
+	unsigned int medialock:1;			/* Do not sense media. */
+	unsigned int default_port:4;		/* Last dev->if_port value. */
+	/* MII transceiver section. */
+	int mii_cnt;						/* MII device addresses. */
+	u16 advertising;					/* NWay media advertisement */
+	unsigned char phys[MII_CNT];		/* MII device addresses, only first one used */
+	spinlock_t lock;
+	void __iomem *base;
+};
+
+static int read_eeprom(void __iomem *ioaddr, int location);
+static int mdio_read(void __iomem *ioaddr, int phy_id, int location);
+static void mdio_write(void __iomem *ioaddr, int phy_id, int location, int value);
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static int yellowfin_open(struct net_device *dev);
+static void yellowfin_timer(unsigned long data);
+static void yellowfin_tx_timeout(struct net_device *dev);
+static int yellowfin_init_ring(struct net_device *dev);
+static netdev_tx_t yellowfin_start_xmit(struct sk_buff *skb,
+					struct net_device *dev);
+static irqreturn_t yellowfin_interrupt(int irq, void *dev_instance);
+static int yellowfin_rx(struct net_device *dev);
+static void yellowfin_error(struct net_device *dev, int intr_status);
+static int yellowfin_close(struct net_device *dev);
+static void set_rx_mode(struct net_device *dev);
+static const struct ethtool_ops ethtool_ops;
+
+static const struct net_device_ops netdev_ops = {
+	.ndo_open 		= yellowfin_open,
+	.ndo_stop 		= yellowfin_close,
+	.ndo_start_xmit 	= yellowfin_start_xmit,
+	.ndo_set_multicast_list = set_rx_mode,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_do_ioctl 		= netdev_ioctl,
+	.ndo_tx_timeout 	= yellowfin_tx_timeout,
+};
+
+static int __devinit yellowfin_init_one(struct pci_dev *pdev,
+					const struct pci_device_id *ent)
+{
+	struct net_device *dev;
+	struct yellowfin_private *np;
+	int irq;
+	int chip_idx = ent->driver_data;
+	static int find_cnt;
+	void __iomem *ioaddr;
+	int i, option = find_cnt < MAX_UNITS ? options[find_cnt] : 0;
+	int drv_flags = pci_id_tbl[chip_idx].drv_flags;
+        void *ring_space;
+        dma_addr_t ring_dma;
+#ifdef USE_IO_OPS
+	int bar = 0;
+#else
+	int bar = 1;
+#endif
+
+/* when built into the kernel, we only print version if device is found */
+#ifndef MODULE
+	static int printed_version;
+	if (!printed_version++)
+		printk(version);
+#endif
+
+	i = pci_enable_device(pdev);
+	if (i) return i;
+
+	dev = alloc_etherdev(sizeof(*np));
+	if (!dev) {
+		pr_err("cannot allocate ethernet device\n");
+		return -ENOMEM;
+	}
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	np = netdev_priv(dev);
+
+	if (pci_request_regions(pdev, DRV_NAME))
+		goto err_out_free_netdev;
+
+	pci_set_master (pdev);
+
+	ioaddr = pci_iomap(pdev, bar, YELLOWFIN_SIZE);
+	if (!ioaddr)
+		goto err_out_free_res;
+
+	irq = pdev->irq;
+
+	if (drv_flags & DontUseEeprom)
+		for (i = 0; i < 6; i++)
+			dev->dev_addr[i] = ioread8(ioaddr + StnAddr + i);
+	else {
+		int ee_offset = (read_eeprom(ioaddr, 6) == 0xff ? 0x100 : 0);
+		for (i = 0; i < 6; i++)
+			dev->dev_addr[i] = read_eeprom(ioaddr, ee_offset + i);
+	}
+
+	/* Reset the chip. */
+	iowrite32(0x80000000, ioaddr + DMACtrl);
+
+	dev->base_addr = (unsigned long)ioaddr;
+	dev->irq = irq;
+
+	pci_set_drvdata(pdev, dev);
+	spin_lock_init(&np->lock);
+
+	np->pci_dev = pdev;
+	np->chip_id = chip_idx;
+	np->drv_flags = drv_flags;
+	np->base = ioaddr;
+
+	ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space)
+		goto err_out_cleardev;
+	np->tx_ring = ring_space;
+	np->tx_ring_dma = ring_dma;
+
+	ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space)
+		goto err_out_unmap_tx;
+	np->rx_ring = ring_space;
+	np->rx_ring_dma = ring_dma;
+
+	ring_space = pci_alloc_consistent(pdev, STATUS_TOTAL_SIZE, &ring_dma);
+	if (!ring_space)
+		goto err_out_unmap_rx;
+	np->tx_status = ring_space;
+	np->tx_status_dma = ring_dma;
+
+	if (dev->mem_start)
+		option = dev->mem_start;
+
+	/* The lower four bits are the media type. */
+	if (option > 0) {
+		if (option & 0x200)
+			np->full_duplex = 1;
+		np->default_port = option & 15;
+		if (np->default_port)
+			np->medialock = 1;
+	}
+	if (find_cnt < MAX_UNITS  &&  full_duplex[find_cnt] > 0)
+		np->full_duplex = 1;
+
+	if (np->full_duplex)
+		np->duplex_lock = 1;
+
+	/* The Yellowfin-specific entries in the device structure. */
+	dev->netdev_ops = &netdev_ops;
+	SET_ETHTOOL_OPS(dev, &ethtool_ops);
+	dev->watchdog_timeo = TX_TIMEOUT;
+
+	if (mtu)
+		dev->mtu = mtu;
+
+	i = register_netdev(dev);
+	if (i)
+		goto err_out_unmap_status;
+
+	netdev_info(dev, "%s type %8x at %p, %pM, IRQ %d\n",
+		    pci_id_tbl[chip_idx].name,
+		    ioread32(ioaddr + ChipRev), ioaddr,
+		    dev->dev_addr, irq);
+
+	if (np->drv_flags & HasMII) {
+		int phy, phy_idx = 0;
+		for (phy = 0; phy < 32 && phy_idx < MII_CNT; phy++) {
+			int mii_status = mdio_read(ioaddr, phy, 1);
+			if (mii_status != 0xffff  &&  mii_status != 0x0000) {
+				np->phys[phy_idx++] = phy;
+				np->advertising = mdio_read(ioaddr, phy, 4);
+				netdev_info(dev, "MII PHY found at address %d, status 0x%04x advertising %04x\n",
+					    phy, mii_status, np->advertising);
+			}
+		}
+		np->mii_cnt = phy_idx;
+	}
+
+	find_cnt++;
+
+	return 0;
+
+err_out_unmap_status:
+        pci_free_consistent(pdev, STATUS_TOTAL_SIZE, np->tx_status,
+		np->tx_status_dma);
+err_out_unmap_rx:
+        pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
+err_out_unmap_tx:
+        pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
+err_out_cleardev:
+	pci_set_drvdata(pdev, NULL);
+	pci_iounmap(pdev, ioaddr);
+err_out_free_res:
+	pci_release_regions(pdev);
+err_out_free_netdev:
+	free_netdev (dev);
+	return -ENODEV;
+}
+
+static int __devinit read_eeprom(void __iomem *ioaddr, int location)
+{
+	int bogus_cnt = 10000;		/* Typical 33Mhz: 1050 ticks */
+
+	iowrite8(location, ioaddr + EEAddr);
+	iowrite8(0x30 | ((location >> 8) & 7), ioaddr + EECtrl);
+	while ((ioread8(ioaddr + EEStatus) & 0x80)  &&  --bogus_cnt > 0)
+		;
+	return ioread8(ioaddr + EERead);
+}
+
+/* MII Managemen Data I/O accesses.
+   These routines assume the MDIO controller is idle, and do not exit until
+   the command is finished. */
+
+static int mdio_read(void __iomem *ioaddr, int phy_id, int location)
+{
+	int i;
+
+	iowrite16((phy_id<<8) + location, ioaddr + MII_Addr);
+	iowrite16(1, ioaddr + MII_Cmd);
+	for (i = 10000; i >= 0; i--)
+		if ((ioread16(ioaddr + MII_Status) & 1) == 0)
+			break;
+	return ioread16(ioaddr + MII_Rd_Data);
+}
+
+static void mdio_write(void __iomem *ioaddr, int phy_id, int location, int value)
+{
+	int i;
+
+	iowrite16((phy_id<<8) + location, ioaddr + MII_Addr);
+	iowrite16(value, ioaddr + MII_Wr_Data);
+
+	/* Wait for the command to finish. */
+	for (i = 10000; i >= 0; i--)
+		if ((ioread16(ioaddr + MII_Status) & 1) == 0)
+			break;
+}
+
+
+static int yellowfin_open(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	void __iomem *ioaddr = yp->base;
+	int i, ret;
+
+	/* Reset the chip. */
+	iowrite32(0x80000000, ioaddr + DMACtrl);
+
+	ret = request_irq(dev->irq, yellowfin_interrupt, IRQF_SHARED, dev->name, dev);
+	if (ret)
+		return ret;
+
+	if (yellowfin_debug > 1)
+		netdev_printk(KERN_DEBUG, dev, "%s() irq %d\n",
+			      __func__, dev->irq);
+
+	ret = yellowfin_init_ring(dev);
+	if (ret) {
+		free_irq(dev->irq, dev);
+		return ret;
+	}
+
+	iowrite32(yp->rx_ring_dma, ioaddr + RxPtr);
+	iowrite32(yp->tx_ring_dma, ioaddr + TxPtr);
+
+	for (i = 0; i < 6; i++)
+		iowrite8(dev->dev_addr[i], ioaddr + StnAddr + i);
+
+	/* Set up various condition 'select' registers.
+	   There are no options here. */
+	iowrite32(0x00800080, ioaddr + TxIntrSel); 	/* Interrupt on Tx abort */
+	iowrite32(0x00800080, ioaddr + TxBranchSel);	/* Branch on Tx abort */
+	iowrite32(0x00400040, ioaddr + TxWaitSel); 	/* Wait on Tx status */
+	iowrite32(0x00400040, ioaddr + RxIntrSel);	/* Interrupt on Rx done */
+	iowrite32(0x00400040, ioaddr + RxBranchSel);	/* Branch on Rx error */
+	iowrite32(0x00400040, ioaddr + RxWaitSel);	/* Wait on Rx done */
+
+	/* Initialize other registers: with so many this eventually this will
+	   converted to an offset/value list. */
+	iowrite32(dma_ctrl, ioaddr + DMACtrl);
+	iowrite16(fifo_cfg, ioaddr + FIFOcfg);
+	/* Enable automatic generation of flow control frames, period 0xffff. */
+	iowrite32(0x0030FFFF, ioaddr + FlowCtrl);
+
+	yp->tx_threshold = 32;
+	iowrite32(yp->tx_threshold, ioaddr + TxThreshold);
+
+	if (dev->if_port == 0)
+		dev->if_port = yp->default_port;
+
+	netif_start_queue(dev);
+
+	/* Setting the Rx mode will start the Rx process. */
+	if (yp->drv_flags & IsGigabit) {
+		/* We are always in full-duplex mode with gigabit! */
+		yp->full_duplex = 1;
+		iowrite16(0x01CF, ioaddr + Cnfg);
+	} else {
+		iowrite16(0x0018, ioaddr + FrameGap0); /* 0060/4060 for non-MII 10baseT */
+		iowrite16(0x1018, ioaddr + FrameGap1);
+		iowrite16(0x101C | (yp->full_duplex ? 2 : 0), ioaddr + Cnfg);
+	}
+	set_rx_mode(dev);
+
+	/* Enable interrupts by setting the interrupt mask. */
+	iowrite16(0x81ff, ioaddr + IntrEnb);			/* See enum intr_status_bits */
+	iowrite16(0x0000, ioaddr + EventStatus);		/* Clear non-interrupting events */
+	iowrite32(0x80008000, ioaddr + RxCtrl);		/* Start Rx and Tx channels. */
+	iowrite32(0x80008000, ioaddr + TxCtrl);
+
+	if (yellowfin_debug > 2) {
+		netdev_printk(KERN_DEBUG, dev, "Done %s()\n", __func__);
+	}
+
+	/* Set the timer to check for link beat. */
+	init_timer(&yp->timer);
+	yp->timer.expires = jiffies + 3*HZ;
+	yp->timer.data = (unsigned long)dev;
+	yp->timer.function = yellowfin_timer;				/* timer handler */
+	add_timer(&yp->timer);
+
+	return 0;
+}
+
+static void yellowfin_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct yellowfin_private *yp = netdev_priv(dev);
+	void __iomem *ioaddr = yp->base;
+	int next_tick = 60*HZ;
+
+	if (yellowfin_debug > 3) {
+		netdev_printk(KERN_DEBUG, dev, "Yellowfin timer tick, status %08x\n",
+			      ioread16(ioaddr + IntrStatus));
+	}
+
+	if (yp->mii_cnt) {
+		int bmsr = mdio_read(ioaddr, yp->phys[0], MII_BMSR);
+		int lpa = mdio_read(ioaddr, yp->phys[0], MII_LPA);
+		int negotiated = lpa & yp->advertising;
+		if (yellowfin_debug > 1)
+			netdev_printk(KERN_DEBUG, dev, "MII #%d status register is %04x, link partner capability %04x\n",
+				      yp->phys[0], bmsr, lpa);
+
+		yp->full_duplex = mii_duplex(yp->duplex_lock, negotiated);
+
+		iowrite16(0x101C | (yp->full_duplex ? 2 : 0), ioaddr + Cnfg);
+
+		if (bmsr & BMSR_LSTATUS)
+			next_tick = 60*HZ;
+		else
+			next_tick = 3*HZ;
+	}
+
+	yp->timer.expires = jiffies + next_tick;
+	add_timer(&yp->timer);
+}
+
+static void yellowfin_tx_timeout(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	void __iomem *ioaddr = yp->base;
+
+	netdev_warn(dev, "Yellowfin transmit timed out at %d/%d Tx status %04x, Rx status %04x, resetting...\n",
+		    yp->cur_tx, yp->dirty_tx,
+		    ioread32(ioaddr + TxStatus),
+		    ioread32(ioaddr + RxStatus));
+
+	/* Note: these should be KERN_DEBUG. */
+	if (yellowfin_debug) {
+		int i;
+		pr_warning("  Rx ring %p: ", yp->rx_ring);
+		for (i = 0; i < RX_RING_SIZE; i++)
+			pr_cont(" %08x", yp->rx_ring[i].result_status);
+		pr_cont("\n");
+		pr_warning("  Tx ring %p: ", yp->tx_ring);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			pr_cont(" %04x /%08x",
+			       yp->tx_status[i].tx_errs,
+			       yp->tx_ring[i].result_status);
+		pr_cont("\n");
+	}
+
+	/* If the hardware is found to hang regularly, we will update the code
+	   to reinitialize the chip here. */
+	dev->if_port = 0;
+
+	/* Wake the potentially-idle transmit channel. */
+	iowrite32(0x10001000, yp->base + TxCtrl);
+	if (yp->cur_tx - yp->dirty_tx < TX_QUEUE_SIZE)
+		netif_wake_queue (dev);		/* Typical path */
+
+	dev->trans_start = jiffies; /* prevent tx timeout */
+	dev->stats.tx_errors++;
+}
+
+/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
+static int yellowfin_init_ring(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	int i, j;
+
+	yp->tx_full = 0;
+	yp->cur_rx = yp->cur_tx = 0;
+	yp->dirty_tx = 0;
+
+	yp->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		yp->rx_ring[i].dbdma_cmd =
+			cpu_to_le32(CMD_RX_BUF | INTR_ALWAYS | yp->rx_buf_sz);
+		yp->rx_ring[i].branch_addr = cpu_to_le32(yp->rx_ring_dma +
+			((i+1)%RX_RING_SIZE)*sizeof(struct yellowfin_desc));
+	}
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz + 2);
+		yp->rx_skbuff[i] = skb;
+		if (skb == NULL)
+			break;
+		skb->dev = dev;		/* Mark as being used by this device. */
+		skb_reserve(skb, 2);	/* 16 byte align the IP header. */
+		yp->rx_ring[i].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
+			skb->data, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+	}
+	if (i != RX_RING_SIZE) {
+		for (j = 0; j < i; j++)
+			dev_kfree_skb(yp->rx_skbuff[j]);
+		return -ENOMEM;
+	}
+	yp->rx_ring[i-1].dbdma_cmd = cpu_to_le32(CMD_STOP);
+	yp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
+
+#define NO_TXSTATS
+#ifdef NO_TXSTATS
+	/* In this mode the Tx ring needs only a single descriptor. */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		yp->tx_skbuff[i] = NULL;
+		yp->tx_ring[i].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->tx_ring[i].branch_addr = cpu_to_le32(yp->tx_ring_dma +
+			((i+1)%TX_RING_SIZE)*sizeof(struct yellowfin_desc));
+	}
+	/* Wrap ring */
+	yp->tx_ring[--i].dbdma_cmd = cpu_to_le32(CMD_STOP | BRANCH_ALWAYS);
+#else
+{
+	/* Tx ring needs a pair of descriptors, the second for the status. */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		j = 2*i;
+		yp->tx_skbuff[i] = 0;
+		/* Branch on Tx error. */
+		yp->tx_ring[j].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->tx_ring[j].branch_addr = cpu_to_le32(yp->tx_ring_dma +
+			(j+1)*sizeof(struct yellowfin_desc));
+		j++;
+		if (yp->flags & FullTxStatus) {
+			yp->tx_ring[j].dbdma_cmd =
+				cpu_to_le32(CMD_TXSTATUS | sizeof(*yp->tx_status));
+			yp->tx_ring[j].request_cnt = sizeof(*yp->tx_status);
+			yp->tx_ring[j].addr = cpu_to_le32(yp->tx_status_dma +
+				i*sizeof(struct tx_status_words));
+		} else {
+			/* Symbios chips write only tx_errs word. */
+			yp->tx_ring[j].dbdma_cmd =
+				cpu_to_le32(CMD_TXSTATUS | INTR_ALWAYS | 2);
+			yp->tx_ring[j].request_cnt = 2;
+			/* Om pade ummmmm... */
+			yp->tx_ring[j].addr = cpu_to_le32(yp->tx_status_dma +
+				i*sizeof(struct tx_status_words) +
+				&(yp->tx_status[0].tx_errs) -
+				&(yp->tx_status[0]));
+		}
+		yp->tx_ring[j].branch_addr = cpu_to_le32(yp->tx_ring_dma +
+			((j+1)%(2*TX_RING_SIZE))*sizeof(struct yellowfin_desc));
+	}
+	/* Wrap ring */
+	yp->tx_ring[++j].dbdma_cmd |= cpu_to_le32(BRANCH_ALWAYS | INTR_ALWAYS);
+}
+#endif
+	yp->tx_tail_desc = &yp->tx_status[0];
+	return 0;
+}
+
+static netdev_tx_t yellowfin_start_xmit(struct sk_buff *skb,
+					struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	unsigned entry;
+	int len = skb->len;
+
+	netif_stop_queue (dev);
+
+	/* Note: Ordering is important here, set the field with the
+	   "ownership" bit last, and only then increment cur_tx. */
+
+	/* Calculate the next Tx descriptor entry. */
+	entry = yp->cur_tx % TX_RING_SIZE;
+
+	if (gx_fix) {	/* Note: only works for paddable protocols e.g.  IP. */
+		int cacheline_end = ((unsigned long)skb->data + skb->len) % 32;
+		/* Fix GX chipset errata. */
+		if (cacheline_end > 24  || cacheline_end == 0) {
+			len = skb->len + 32 - cacheline_end + 1;
+			if (skb_padto(skb, len)) {
+				yp->tx_skbuff[entry] = NULL;
+				netif_wake_queue(dev);
+				return NETDEV_TX_OK;
+			}
+		}
+	}
+	yp->tx_skbuff[entry] = skb;
+
+#ifdef NO_TXSTATS
+	yp->tx_ring[entry].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
+		skb->data, len, PCI_DMA_TODEVICE));
+	yp->tx_ring[entry].result_status = 0;
+	if (entry >= TX_RING_SIZE-1) {
+		/* New stop command. */
+		yp->tx_ring[0].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->tx_ring[TX_RING_SIZE-1].dbdma_cmd =
+			cpu_to_le32(CMD_TX_PKT|BRANCH_ALWAYS | len);
+	} else {
+		yp->tx_ring[entry+1].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->tx_ring[entry].dbdma_cmd =
+			cpu_to_le32(CMD_TX_PKT | BRANCH_IFTRUE | len);
+	}
+	yp->cur_tx++;
+#else
+	yp->tx_ring[entry<<1].request_cnt = len;
+	yp->tx_ring[entry<<1].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
+		skb->data, len, PCI_DMA_TODEVICE));
+	/* The input_last (status-write) command is constant, but we must
+	   rewrite the subsequent 'stop' command. */
+
+	yp->cur_tx++;
+	{
+		unsigned next_entry = yp->cur_tx % TX_RING_SIZE;
+		yp->tx_ring[next_entry<<1].dbdma_cmd = cpu_to_le32(CMD_STOP);
+	}
+	/* Final step -- overwrite the old 'stop' command. */
+
+	yp->tx_ring[entry<<1].dbdma_cmd =
+		cpu_to_le32( ((entry % 6) == 0 ? CMD_TX_PKT|INTR_ALWAYS|BRANCH_IFTRUE :
+					  CMD_TX_PKT | BRANCH_IFTRUE) | len);
+#endif
+
+	/* Non-x86 Todo: explicitly flush cache lines here. */
+
+	/* Wake the potentially-idle transmit channel. */
+	iowrite32(0x10001000, yp->base + TxCtrl);
+
+	if (yp->cur_tx - yp->dirty_tx < TX_QUEUE_SIZE)
+		netif_start_queue (dev);		/* Typical path */
+	else
+		yp->tx_full = 1;
+
+	if (yellowfin_debug > 4) {
+		netdev_printk(KERN_DEBUG, dev, "Yellowfin transmit frame #%d queued in slot %d\n",
+			      yp->cur_tx, entry);
+	}
+	return NETDEV_TX_OK;
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread. */
+static irqreturn_t yellowfin_interrupt(int irq, void *dev_instance)
+{
+	struct net_device *dev = dev_instance;
+	struct yellowfin_private *yp;
+	void __iomem *ioaddr;
+	int boguscnt = max_interrupt_work;
+	unsigned int handled = 0;
+
+	yp = netdev_priv(dev);
+	ioaddr = yp->base;
+
+	spin_lock (&yp->lock);
+
+	do {
+		u16 intr_status = ioread16(ioaddr + IntrClear);
+
+		if (yellowfin_debug > 4)
+			netdev_printk(KERN_DEBUG, dev, "Yellowfin interrupt, status %04x\n",
+				      intr_status);
+
+		if (intr_status == 0)
+			break;
+		handled = 1;
+
+		if (intr_status & (IntrRxDone | IntrEarlyRx)) {
+			yellowfin_rx(dev);
+			iowrite32(0x10001000, ioaddr + RxCtrl);		/* Wake Rx engine. */
+		}
+
+#ifdef NO_TXSTATS
+		for (; yp->cur_tx - yp->dirty_tx > 0; yp->dirty_tx++) {
+			int entry = yp->dirty_tx % TX_RING_SIZE;
+			struct sk_buff *skb;
+
+			if (yp->tx_ring[entry].result_status == 0)
+				break;
+			skb = yp->tx_skbuff[entry];
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes += skb->len;
+			/* Free the original skb. */
+			pci_unmap_single(yp->pci_dev, le32_to_cpu(yp->tx_ring[entry].addr),
+				skb->len, PCI_DMA_TODEVICE);
+			dev_kfree_skb_irq(skb);
+			yp->tx_skbuff[entry] = NULL;
+		}
+		if (yp->tx_full &&
+		    yp->cur_tx - yp->dirty_tx < TX_QUEUE_SIZE - 4) {
+			/* The ring is no longer full, clear tbusy. */
+			yp->tx_full = 0;
+			netif_wake_queue(dev);
+		}
+#else
+		if ((intr_status & IntrTxDone) || (yp->tx_tail_desc->tx_errs)) {
+			unsigned dirty_tx = yp->dirty_tx;
+
+			for (dirty_tx = yp->dirty_tx; yp->cur_tx - dirty_tx > 0;
+				 dirty_tx++) {
+				/* Todo: optimize this. */
+				int entry = dirty_tx % TX_RING_SIZE;
+				u16 tx_errs = yp->tx_status[entry].tx_errs;
+				struct sk_buff *skb;
+
+#ifndef final_version
+				if (yellowfin_debug > 5)
+					netdev_printk(KERN_DEBUG, dev, "Tx queue %d check, Tx status %04x %04x %04x %04x\n",
+						      entry,
+						      yp->tx_status[entry].tx_cnt,
+						      yp->tx_status[entry].tx_errs,
+						      yp->tx_status[entry].total_tx_cnt,
+						      yp->tx_status[entry].paused);
+#endif
+				if (tx_errs == 0)
+					break;	/* It still hasn't been Txed */
+				skb = yp->tx_skbuff[entry];
+				if (tx_errs & 0xF810) {
+					/* There was an major error, log it. */
+#ifndef final_version
+					if (yellowfin_debug > 1)
+						netdev_printk(KERN_DEBUG, dev, "Transmit error, Tx status %04x\n",
+							      tx_errs);
+#endif
+					dev->stats.tx_errors++;
+					if (tx_errs & 0xF800) dev->stats.tx_aborted_errors++;
+					if (tx_errs & 0x0800) dev->stats.tx_carrier_errors++;
+					if (tx_errs & 0x2000) dev->stats.tx_window_errors++;
+					if (tx_errs & 0x8000) dev->stats.tx_fifo_errors++;
+				} else {
+#ifndef final_version
+					if (yellowfin_debug > 4)
+						netdev_printk(KERN_DEBUG, dev, "Normal transmit, Tx status %04x\n",
+							      tx_errs);
+#endif
+					dev->stats.tx_bytes += skb->len;
+					dev->stats.collisions += tx_errs & 15;
+					dev->stats.tx_packets++;
+				}
+				/* Free the original skb. */
+				pci_unmap_single(yp->pci_dev,
+					yp->tx_ring[entry<<1].addr, skb->len,
+					PCI_DMA_TODEVICE);
+				dev_kfree_skb_irq(skb);
+				yp->tx_skbuff[entry] = 0;
+				/* Mark status as empty. */
+				yp->tx_status[entry].tx_errs = 0;
+			}
+
+#ifndef final_version
+			if (yp->cur_tx - dirty_tx > TX_RING_SIZE) {
+				netdev_err(dev, "Out-of-sync dirty pointer, %d vs. %d, full=%d\n",
+					   dirty_tx, yp->cur_tx, yp->tx_full);
+				dirty_tx += TX_RING_SIZE;
+			}
+#endif
+
+			if (yp->tx_full &&
+			    yp->cur_tx - dirty_tx < TX_QUEUE_SIZE - 2) {
+				/* The ring is no longer full, clear tbusy. */
+				yp->tx_full = 0;
+				netif_wake_queue(dev);
+			}
+
+			yp->dirty_tx = dirty_tx;
+			yp->tx_tail_desc = &yp->tx_status[dirty_tx % TX_RING_SIZE];
+		}
+#endif
+
+		/* Log errors and other uncommon events. */
+		if (intr_status & 0x2ee)	/* Abnormal error summary. */
+			yellowfin_error(dev, intr_status);
+
+		if (--boguscnt < 0) {
+			netdev_warn(dev, "Too much work at interrupt, status=%#04x\n",
+				    intr_status);
+			break;
+		}
+	} while (1);
+
+	if (yellowfin_debug > 3)
+		netdev_printk(KERN_DEBUG, dev, "exiting interrupt, status=%#04x\n",
+			      ioread16(ioaddr + IntrStatus));
+
+	spin_unlock (&yp->lock);
+	return IRQ_RETVAL(handled);
+}
+
+/* This routine is logically part of the interrupt handler, but separated
+   for clarity and better register allocation. */
+static int yellowfin_rx(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	int entry = yp->cur_rx % RX_RING_SIZE;
+	int boguscnt = yp->dirty_rx + RX_RING_SIZE - yp->cur_rx;
+
+	if (yellowfin_debug > 4) {
+		printk(KERN_DEBUG " In yellowfin_rx(), entry %d status %08x\n",
+			   entry, yp->rx_ring[entry].result_status);
+		printk(KERN_DEBUG "   #%d desc. %08x %08x %08x\n",
+			   entry, yp->rx_ring[entry].dbdma_cmd, yp->rx_ring[entry].addr,
+			   yp->rx_ring[entry].result_status);
+	}
+
+	/* If EOP is set on the next entry, it's a new packet. Send it up. */
+	while (1) {
+		struct yellowfin_desc *desc = &yp->rx_ring[entry];
+		struct sk_buff *rx_skb = yp->rx_skbuff[entry];
+		s16 frame_status;
+		u16 desc_status;
+		int data_size;
+		u8 *buf_addr;
+
+		if(!desc->result_status)
+			break;
+		pci_dma_sync_single_for_cpu(yp->pci_dev, le32_to_cpu(desc->addr),
+			yp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+		desc_status = le32_to_cpu(desc->result_status) >> 16;
+		buf_addr = rx_skb->data;
+		data_size = (le32_to_cpu(desc->dbdma_cmd) -
+			le32_to_cpu(desc->result_status)) & 0xffff;
+		frame_status = get_unaligned_le16(&(buf_addr[data_size - 2]));
+		if (yellowfin_debug > 4)
+			printk(KERN_DEBUG "  %s() status was %04x\n",
+			       __func__, frame_status);
+		if (--boguscnt < 0)
+			break;
+		if ( ! (desc_status & RX_EOP)) {
+			if (data_size != 0)
+				netdev_warn(dev, "Oversized Ethernet frame spanned multiple buffers, status %04x, data_size %d!\n",
+					    desc_status, data_size);
+			dev->stats.rx_length_errors++;
+		} else if ((yp->drv_flags & IsGigabit)  &&  (frame_status & 0x0038)) {
+			/* There was a error. */
+			if (yellowfin_debug > 3)
+				printk(KERN_DEBUG "  %s() Rx error was %04x\n",
+				       __func__, frame_status);
+			dev->stats.rx_errors++;
+			if (frame_status & 0x0060) dev->stats.rx_length_errors++;
+			if (frame_status & 0x0008) dev->stats.rx_frame_errors++;
+			if (frame_status & 0x0010) dev->stats.rx_crc_errors++;
+			if (frame_status < 0) dev->stats.rx_dropped++;
+		} else if ( !(yp->drv_flags & IsGigabit)  &&
+				   ((buf_addr[data_size-1] & 0x85) || buf_addr[data_size-2] & 0xC0)) {
+			u8 status1 = buf_addr[data_size-2];
+			u8 status2 = buf_addr[data_size-1];
+			dev->stats.rx_errors++;
+			if (status1 & 0xC0) dev->stats.rx_length_errors++;
+			if (status2 & 0x03) dev->stats.rx_frame_errors++;
+			if (status2 & 0x04) dev->stats.rx_crc_errors++;
+			if (status2 & 0x80) dev->stats.rx_dropped++;
+#ifdef YF_PROTOTYPE		/* Support for prototype hardware errata. */
+		} else if ((yp->flags & HasMACAddrBug)  &&
+			memcmp(le32_to_cpu(yp->rx_ring_dma +
+				entry*sizeof(struct yellowfin_desc)),
+				dev->dev_addr, 6) != 0 &&
+			memcmp(le32_to_cpu(yp->rx_ring_dma +
+				entry*sizeof(struct yellowfin_desc)),
+				"\377\377\377\377\377\377", 6) != 0) {
+			if (bogus_rx++ == 0)
+				netdev_warn(dev, "Bad frame to %pM\n",
+					    buf_addr);
+#endif
+		} else {
+			struct sk_buff *skb;
+			int pkt_len = data_size -
+				(yp->chip_id ? 7 : 8 + buf_addr[data_size - 8]);
+			/* To verify: Yellowfin Length should omit the CRC! */
+
+#ifndef final_version
+			if (yellowfin_debug > 4)
+				printk(KERN_DEBUG "  %s() normal Rx pkt length %d of %d, bogus_cnt %d\n",
+				       __func__, pkt_len, data_size, boguscnt);
+#endif
+			/* Check if the packet is long enough to just pass up the skbuff
+			   without copying to a properly sized skbuff. */
+			if (pkt_len > rx_copybreak) {
+				skb_put(skb = rx_skb, pkt_len);
+				pci_unmap_single(yp->pci_dev,
+					le32_to_cpu(yp->rx_ring[entry].addr),
+					yp->rx_buf_sz,
+					PCI_DMA_FROMDEVICE);
+				yp->rx_skbuff[entry] = NULL;
+			} else {
+				skb = dev_alloc_skb(pkt_len + 2);
+				if (skb == NULL)
+					break;
+				skb_reserve(skb, 2);	/* 16 byte align the IP header */
+				skb_copy_to_linear_data(skb, rx_skb->data, pkt_len);
+				skb_put(skb, pkt_len);
+				pci_dma_sync_single_for_device(yp->pci_dev,
+								le32_to_cpu(desc->addr),
+								yp->rx_buf_sz,
+								PCI_DMA_FROMDEVICE);
+			}
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_rx(skb);
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += pkt_len;
+		}
+		entry = (++yp->cur_rx) % RX_RING_SIZE;
+	}
+
+	/* Refill the Rx ring buffers. */
+	for (; yp->cur_rx - yp->dirty_rx > 0; yp->dirty_rx++) {
+		entry = yp->dirty_rx % RX_RING_SIZE;
+		if (yp->rx_skbuff[entry] == NULL) {
+			struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz + 2);
+			if (skb == NULL)
+				break;				/* Better luck next round. */
+			yp->rx_skbuff[entry] = skb;
+			skb->dev = dev;	/* Mark as being used by this device. */
+			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
+			yp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
+				skb->data, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+		}
+		yp->rx_ring[entry].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->rx_ring[entry].result_status = 0;	/* Clear complete bit. */
+		if (entry != 0)
+			yp->rx_ring[entry - 1].dbdma_cmd =
+				cpu_to_le32(CMD_RX_BUF | INTR_ALWAYS | yp->rx_buf_sz);
+		else
+			yp->rx_ring[RX_RING_SIZE - 1].dbdma_cmd =
+				cpu_to_le32(CMD_RX_BUF | INTR_ALWAYS | BRANCH_ALWAYS
+							| yp->rx_buf_sz);
+	}
+
+	return 0;
+}
+
+static void yellowfin_error(struct net_device *dev, int intr_status)
+{
+	netdev_err(dev, "Something Wicked happened! %04x\n", intr_status);
+	/* Hmmmmm, it's not clear what to do here. */
+	if (intr_status & (IntrTxPCIErr | IntrTxPCIFault))
+		dev->stats.tx_errors++;
+	if (intr_status & (IntrRxPCIErr | IntrRxPCIFault))
+		dev->stats.rx_errors++;
+}
+
+static int yellowfin_close(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	void __iomem *ioaddr = yp->base;
+	int i;
+
+	netif_stop_queue (dev);
+
+	if (yellowfin_debug > 1) {
+		netdev_printk(KERN_DEBUG, dev, "Shutting down ethercard, status was Tx %04x Rx %04x Int %02x\n",
+			      ioread16(ioaddr + TxStatus),
+			      ioread16(ioaddr + RxStatus),
+			      ioread16(ioaddr + IntrStatus));
+		netdev_printk(KERN_DEBUG, dev, "Queue pointers were Tx %d / %d,  Rx %d / %d\n",
+			      yp->cur_tx, yp->dirty_tx,
+			      yp->cur_rx, yp->dirty_rx);
+	}
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	iowrite16(0x0000, ioaddr + IntrEnb);
+
+	/* Stop the chip's Tx and Rx processes. */
+	iowrite32(0x80000000, ioaddr + RxCtrl);
+	iowrite32(0x80000000, ioaddr + TxCtrl);
+
+	del_timer(&yp->timer);
+
+#if defined(__i386__)
+	if (yellowfin_debug > 2) {
+		printk(KERN_DEBUG "  Tx ring at %08llx:\n",
+				(unsigned long long)yp->tx_ring_dma);
+		for (i = 0; i < TX_RING_SIZE*2; i++)
+			printk(KERN_DEBUG " %c #%d desc. %08x %08x %08x %08x\n",
+				   ioread32(ioaddr + TxPtr) == (long)&yp->tx_ring[i] ? '>' : ' ',
+				   i, yp->tx_ring[i].dbdma_cmd, yp->tx_ring[i].addr,
+				   yp->tx_ring[i].branch_addr, yp->tx_ring[i].result_status);
+		printk(KERN_DEBUG "  Tx status %p:\n", yp->tx_status);
+		for (i = 0; i < TX_RING_SIZE; i++)
+			printk(KERN_DEBUG "   #%d status %04x %04x %04x %04x\n",
+				   i, yp->tx_status[i].tx_cnt, yp->tx_status[i].tx_errs,
+				   yp->tx_status[i].total_tx_cnt, yp->tx_status[i].paused);
+
+		printk(KERN_DEBUG "  Rx ring %08llx:\n",
+				(unsigned long long)yp->rx_ring_dma);
+		for (i = 0; i < RX_RING_SIZE; i++) {
+			printk(KERN_DEBUG " %c #%d desc. %08x %08x %08x\n",
+				   ioread32(ioaddr + RxPtr) == (long)&yp->rx_ring[i] ? '>' : ' ',
+				   i, yp->rx_ring[i].dbdma_cmd, yp->rx_ring[i].addr,
+				   yp->rx_ring[i].result_status);
+			if (yellowfin_debug > 6) {
+				if (get_unaligned((u8*)yp->rx_ring[i].addr) != 0x69) {
+					int j;
+
+					printk(KERN_DEBUG);
+					for (j = 0; j < 0x50; j++)
+						pr_cont(" %04x",
+							get_unaligned(((u16*)yp->rx_ring[i].addr) + j));
+					pr_cont("\n");
+				}
+			}
+		}
+	}
+#endif /* __i386__ debugging only */
+
+	free_irq(dev->irq, dev);
+
+	/* Free all the skbuffs in the Rx queue. */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		yp->rx_ring[i].dbdma_cmd = cpu_to_le32(CMD_STOP);
+		yp->rx_ring[i].addr = cpu_to_le32(0xBADF00D0); /* An invalid address. */
+		if (yp->rx_skbuff[i]) {
+			dev_kfree_skb(yp->rx_skbuff[i]);
+		}
+		yp->rx_skbuff[i] = NULL;
+	}
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		if (yp->tx_skbuff[i])
+			dev_kfree_skb(yp->tx_skbuff[i]);
+		yp->tx_skbuff[i] = NULL;
+	}
+
+#ifdef YF_PROTOTYPE			/* Support for prototype hardware errata. */
+	if (yellowfin_debug > 0) {
+		netdev_printk(KERN_DEBUG, dev, "Received %d frames that we should not have\n",
+			      bogus_rx);
+	}
+#endif
+
+	return 0;
+}
+
+/* Set or clear the multicast filter for this adaptor. */
+
+static void set_rx_mode(struct net_device *dev)
+{
+	struct yellowfin_private *yp = netdev_priv(dev);
+	void __iomem *ioaddr = yp->base;
+	u16 cfg_value = ioread16(ioaddr + Cnfg);
+
+	/* Stop the Rx process to change any value. */
+	iowrite16(cfg_value & ~0x1000, ioaddr + Cnfg);
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
+		iowrite16(0x000F, ioaddr + AddrMode);
+	} else if ((netdev_mc_count(dev) > 64) ||
+		   (dev->flags & IFF_ALLMULTI)) {
+		/* Too many to filter well, or accept all multicasts. */
+		iowrite16(0x000B, ioaddr + AddrMode);
+	} else if (!netdev_mc_empty(dev)) { /* Must use the multicast hash table. */
+		struct netdev_hw_addr *ha;
+		u16 hash_table[4];
+		int i;
+
+		memset(hash_table, 0, sizeof(hash_table));
+		netdev_for_each_mc_addr(ha, dev) {
+			unsigned int bit;
+
+			/* Due to a bug in the early chip versions, multiple filter
+			   slots must be set for each address. */
+			if (yp->drv_flags & HasMulticastBug) {
+				bit = (ether_crc_le(3, ha->addr) >> 3) & 0x3f;
+				hash_table[bit >> 4] |= (1 << bit);
+				bit = (ether_crc_le(4, ha->addr) >> 3) & 0x3f;
+				hash_table[bit >> 4] |= (1 << bit);
+				bit = (ether_crc_le(5, ha->addr) >> 3) & 0x3f;
+				hash_table[bit >> 4] |= (1 << bit);
+			}
+			bit = (ether_crc_le(6, ha->addr) >> 3) & 0x3f;
+			hash_table[bit >> 4] |= (1 << bit);
+		}
+		/* Copy the hash table to the chip. */
+		for (i = 0; i < 4; i++)
+			iowrite16(hash_table[i], ioaddr + HashTbl + i*2);
+		iowrite16(0x0003, ioaddr + AddrMode);
+	} else {					/* Normal, unicast/broadcast-only mode. */
+		iowrite16(0x0001, ioaddr + AddrMode);
+	}
+	/* Restart the Rx process. */
+	iowrite16(cfg_value | 0x1000, ioaddr + Cnfg);
+}
+
+static void yellowfin_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	struct yellowfin_private *np = netdev_priv(dev);
+	strcpy(info->driver, DRV_NAME);
+	strcpy(info->version, DRV_VERSION);
+	strcpy(info->bus_info, pci_name(np->pci_dev));
+}
+
+static const struct ethtool_ops ethtool_ops = {
+	.get_drvinfo = yellowfin_get_drvinfo
+};
+
+static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct yellowfin_private *np = netdev_priv(dev);
+	void __iomem *ioaddr = np->base;
+	struct mii_ioctl_data *data = if_mii(rq);
+
+	switch(cmd) {
+	case SIOCGMIIPHY:		/* Get address of MII PHY in use. */
+		data->phy_id = np->phys[0] & 0x1f;
+		/* Fall Through */
+
+	case SIOCGMIIREG:		/* Read MII PHY register. */
+		data->val_out = mdio_read(ioaddr, data->phy_id & 0x1f, data->reg_num & 0x1f);
+		return 0;
+
+	case SIOCSMIIREG:		/* Write MII PHY register. */
+		if (data->phy_id == np->phys[0]) {
+			u16 value = data->val_in;
+			switch (data->reg_num) {
+			case 0:
+				/* Check for autonegotiation on or reset. */
+				np->medialock = (value & 0x9000) ? 0 : 1;
+				if (np->medialock)
+					np->full_duplex = (value & 0x0100) ? 1 : 0;
+				break;
+			case 4: np->advertising = value; break;
+			}
+			/* Perhaps check_duplex(dev), depending on chip semantics. */
+		}
+		mdio_write(ioaddr, data->phy_id & 0x1f, data->reg_num & 0x1f, data->val_in);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+
+static void __devexit yellowfin_remove_one (struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct yellowfin_private *np;
+
+	BUG_ON(!dev);
+	np = netdev_priv(dev);
+
+        pci_free_consistent(pdev, STATUS_TOTAL_SIZE, np->tx_status,
+		np->tx_status_dma);
+	pci_free_consistent(pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
+	pci_free_consistent(pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
+	unregister_netdev (dev);
+
+	pci_iounmap(pdev, np->base);
+
+	pci_release_regions (pdev);
+
+	free_netdev (dev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+
+static struct pci_driver yellowfin_driver = {
+	.name		= DRV_NAME,
+	.id_table	= yellowfin_pci_tbl,
+	.probe		= yellowfin_init_one,
+	.remove		= __devexit_p(yellowfin_remove_one),
+};
+
+
+static int __init yellowfin_init (void)
+{
+/* when a module, this is printed whether or not devices are found in probe */
+#ifdef MODULE
+	printk(version);
+#endif
+	return pci_register_driver(&yellowfin_driver);
+}
+
+
+static void __exit yellowfin_cleanup (void)
+{
+	pci_unregister_driver (&yellowfin_driver);
+}
+
+
+module_init(yellowfin_init);
+module_exit(yellowfin_cleanup);