Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1904 insertions, 0 deletions

diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
new file mode 100644
index 00000000000..58c6a85c3aa
--- /dev/null
+++ b/drivers/net/8139cp.c
@@ -0,0 +1,1904 @@
+/* 8139cp.c: A Linux PCI Ethernet driver for the RealTek 8139C+ chips. */
+/*
+	Copyright 2001-2004 Jeff Garzik <jgarzik@pobox.com>
+
+	Copyright (C) 2001, 2002 David S. Miller (davem@redhat.com) [tg3.c]
+	Copyright (C) 2000, 2001 David S. Miller (davem@redhat.com) [sungem.c]
+	Copyright 2001 Manfred Spraul				    [natsemi.c]
+	Copyright 1999-2001 by Donald Becker.			    [natsemi.c]
+       	Written 1997-2001 by Donald Becker.			    [8139too.c]
+	Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. [acenic.c]
+
+	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.
+
+	See the file COPYING in this distribution for more information.
+
+	Contributors:
+	
+		Wake-on-LAN support - Felipe Damasio <felipewd@terra.com.br>
+		PCI suspend/resume  - Felipe Damasio <felipewd@terra.com.br>
+		LinkChg interrupt   - Felipe Damasio <felipewd@terra.com.br>
+			
+	TODO:
+	* Test Tx checksumming thoroughly
+	* Implement dev->tx_timeout
+
+	Low priority TODO:
+	* Complete reset on PciErr
+	* Consider Rx interrupt mitigation using TimerIntr
+	* Investigate using skb->priority with h/w VLAN priority
+	* Investigate using High Priority Tx Queue with skb->priority
+	* Adjust Rx FIFO threshold and Max Rx DMA burst on Rx FIFO error
+	* Adjust Tx FIFO threshold and Max Tx DMA burst on Tx FIFO error
+	* Implement Tx software interrupt mitigation via
+	  Tx descriptor bit
+	* The real minimum of CP_MIN_MTU is 4 bytes.  However,
+	  for this to be supported, one must(?) turn on packet padding.
+	* Support external MII transceivers (patch available)
+
+	NOTES:
+	* TX checksumming is considered experimental.  It is off by
+	  default, use ethtool to turn it on.
+
+ */
+
+#define DRV_NAME		"8139cp"
+#define DRV_VERSION		"1.2"
+#define DRV_RELDATE		"Mar 22, 2004"
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/if_vlan.h>
+#include <linux/crc32.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/cache.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+/* VLAN tagging feature enable/disable */
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#define CP_VLAN_TAG_USED 1
+#define CP_VLAN_TX_TAG(tx_desc,vlan_tag_value) \
+	do { (tx_desc)->opts2 = (vlan_tag_value); } while (0)
+#else
+#define CP_VLAN_TAG_USED 0
+#define CP_VLAN_TX_TAG(tx_desc,vlan_tag_value) \
+	do { (tx_desc)->opts2 = 0; } while (0)
+#endif
+
+/* These identify the driver base version and may not be removed. */
+static char version[] =
+KERN_INFO DRV_NAME ": 10/100 PCI Ethernet driver v" DRV_VERSION " (" DRV_RELDATE ")\n";
+
+MODULE_AUTHOR("Jeff Garzik <jgarzik@pobox.com>");
+MODULE_DESCRIPTION("RealTek RTL-8139C+ series 10/100 PCI Ethernet driver");
+MODULE_LICENSE("GPL");
+
+static int debug = -1;
+MODULE_PARM (debug, "i");
+MODULE_PARM_DESC (debug, "8139cp: bitmapped message enable number");
+
+/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
+   The RTL chips use a 64 element hash table based on the Ethernet CRC.  */
+static int multicast_filter_limit = 32;
+MODULE_PARM (multicast_filter_limit, "i");
+MODULE_PARM_DESC (multicast_filter_limit, "8139cp: maximum number of filtered multicast addresses");
+
+#define PFX			DRV_NAME ": "
+
+#ifndef TRUE
+#define FALSE 0
+#define TRUE (!FALSE)
+#endif
+
+#define CP_DEF_MSG_ENABLE	(NETIF_MSG_DRV		| \
+				 NETIF_MSG_PROBE 	| \
+				 NETIF_MSG_LINK)
+#define CP_NUM_STATS		14	/* struct cp_dma_stats, plus one */
+#define CP_STATS_SIZE		64	/* size in bytes of DMA stats block */
+#define CP_REGS_SIZE		(0xff + 1)
+#define CP_REGS_VER		1		/* version 1 */
+#define CP_RX_RING_SIZE		64
+#define CP_TX_RING_SIZE		64
+#define CP_RING_BYTES		\
+		((sizeof(struct cp_desc) * CP_RX_RING_SIZE) +	\
+		 (sizeof(struct cp_desc) * CP_TX_RING_SIZE) +	\
+		 CP_STATS_SIZE)
+#define NEXT_TX(N)		(((N) + 1) & (CP_TX_RING_SIZE - 1))
+#define NEXT_RX(N)		(((N) + 1) & (CP_RX_RING_SIZE - 1))
+#define TX_BUFFS_AVAIL(CP)					\
+	(((CP)->tx_tail <= (CP)->tx_head) ?			\
+	  (CP)->tx_tail + (CP_TX_RING_SIZE - 1) - (CP)->tx_head :	\
+	  (CP)->tx_tail - (CP)->tx_head - 1)
+
+#define PKT_BUF_SZ		1536	/* Size of each temporary Rx buffer.*/
+#define RX_OFFSET		2
+#define CP_INTERNAL_PHY		32
+
+/* The following settings are log_2(bytes)-4:  0 == 16 bytes .. 6==1024, 7==end of packet. */
+#define RX_FIFO_THRESH		5	/* Rx buffer level before first PCI xfer.  */
+#define RX_DMA_BURST		4	/* Maximum PCI burst, '4' is 256 */
+#define TX_DMA_BURST		6	/* Maximum PCI burst, '6' is 1024 */
+#define TX_EARLY_THRESH		256	/* Early Tx threshold, in bytes */
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT		(6*HZ)
+
+/* hardware minimum and maximum for a single frame's data payload */
+#define CP_MIN_MTU		60	/* TODO: allow lower, but pad */
+#define CP_MAX_MTU		4096
+
+enum {
+	/* NIC register offsets */
+	MAC0		= 0x00,	/* Ethernet hardware address. */
+	MAR0		= 0x08,	/* Multicast filter. */
+	StatsAddr	= 0x10,	/* 64-bit start addr of 64-byte DMA stats blk */
+	TxRingAddr	= 0x20, /* 64-bit start addr of Tx ring */
+	HiTxRingAddr	= 0x28, /* 64-bit start addr of high priority Tx ring */
+	Cmd		= 0x37, /* Command register */
+	IntrMask	= 0x3C, /* Interrupt mask */
+	IntrStatus	= 0x3E, /* Interrupt status */
+	TxConfig	= 0x40, /* Tx configuration */
+	ChipVersion	= 0x43, /* 8-bit chip version, inside TxConfig */
+	RxConfig	= 0x44, /* Rx configuration */
+	RxMissed	= 0x4C,	/* 24 bits valid, write clears */
+	Cfg9346		= 0x50, /* EEPROM select/control; Cfg reg [un]lock */
+	Config1		= 0x52, /* Config1 */
+	Config3		= 0x59, /* Config3 */
+	Config4		= 0x5A, /* Config4 */
+	MultiIntr	= 0x5C, /* Multiple interrupt select */
+	BasicModeCtrl	= 0x62,	/* MII BMCR */
+	BasicModeStatus	= 0x64, /* MII BMSR */
+	NWayAdvert	= 0x66, /* MII ADVERTISE */
+	NWayLPAR	= 0x68, /* MII LPA */
+	NWayExpansion	= 0x6A, /* MII Expansion */
+	Config5		= 0xD8,	/* Config5 */
+	TxPoll		= 0xD9,	/* Tell chip to check Tx descriptors for work */
+	RxMaxSize	= 0xDA, /* Max size of an Rx packet (8169 only) */
+	CpCmd		= 0xE0, /* C+ Command register (C+ mode only) */
+	IntrMitigate	= 0xE2,	/* rx/tx interrupt mitigation control */
+	RxRingAddr	= 0xE4, /* 64-bit start addr of Rx ring */
+	TxThresh	= 0xEC, /* Early Tx threshold */
+	OldRxBufAddr	= 0x30, /* DMA address of Rx ring buffer (C mode) */
+	OldTSD0		= 0x10, /* DMA address of first Tx desc (C mode) */
+
+	/* Tx and Rx status descriptors */
+	DescOwn		= (1 << 31), /* Descriptor is owned by NIC */
+	RingEnd		= (1 << 30), /* End of descriptor ring */
+	FirstFrag	= (1 << 29), /* First segment of a packet */
+	LastFrag	= (1 << 28), /* Final segment of a packet */
+	TxError		= (1 << 23), /* Tx error summary */
+	RxError		= (1 << 20), /* Rx error summary */
+	IPCS		= (1 << 18), /* Calculate IP checksum */
+	UDPCS		= (1 << 17), /* Calculate UDP/IP checksum */
+	TCPCS		= (1 << 16), /* Calculate TCP/IP checksum */
+	TxVlanTag	= (1 << 17), /* Add VLAN tag */
+	RxVlanTagged	= (1 << 16), /* Rx VLAN tag available */
+	IPFail		= (1 << 15), /* IP checksum failed */
+	UDPFail		= (1 << 14), /* UDP/IP checksum failed */
+	TCPFail		= (1 << 13), /* TCP/IP checksum failed */
+	NormalTxPoll	= (1 << 6),  /* One or more normal Tx packets to send */
+	PID1		= (1 << 17), /* 2 protocol id bits:  0==non-IP, */
+	PID0		= (1 << 16), /* 1==UDP/IP, 2==TCP/IP, 3==IP */
+	RxProtoTCP	= 1,
+	RxProtoUDP	= 2,
+	RxProtoIP	= 3,
+	TxFIFOUnder	= (1 << 25), /* Tx FIFO underrun */
+	TxOWC		= (1 << 22), /* Tx Out-of-window collision */
+	TxLinkFail	= (1 << 21), /* Link failed during Tx of packet */
+	TxMaxCol	= (1 << 20), /* Tx aborted due to excessive collisions */
+	TxColCntShift	= 16,	     /* Shift, to get 4-bit Tx collision cnt */
+	TxColCntMask	= 0x01 | 0x02 | 0x04 | 0x08, /* 4-bit collision count */
+	RxErrFrame	= (1 << 27), /* Rx frame alignment error */
+	RxMcast		= (1 << 26), /* Rx multicast packet rcv'd */
+	RxErrCRC	= (1 << 18), /* Rx CRC error */
+	RxErrRunt	= (1 << 19), /* Rx error, packet < 64 bytes */
+	RxErrLong	= (1 << 21), /* Rx error, packet > 4096 bytes */
+	RxErrFIFO	= (1 << 22), /* Rx error, FIFO overflowed, pkt bad */
+
+	/* StatsAddr register */
+	DumpStats	= (1 << 3),  /* Begin stats dump */
+
+	/* RxConfig register */
+	RxCfgFIFOShift	= 13,	     /* Shift, to get Rx FIFO thresh value */
+	RxCfgDMAShift	= 8,	     /* Shift, to get Rx Max DMA value */
+	AcceptErr	= 0x20,	     /* Accept packets with CRC errors */
+	AcceptRunt	= 0x10,	     /* Accept runt (<64 bytes) packets */
+	AcceptBroadcast	= 0x08,	     /* Accept broadcast packets */
+	AcceptMulticast	= 0x04,	     /* Accept multicast packets */
+	AcceptMyPhys	= 0x02,	     /* Accept pkts with our MAC as dest */
+	AcceptAllPhys	= 0x01,	     /* Accept all pkts w/ physical dest */
+
+	/* IntrMask / IntrStatus registers */
+	PciErr		= (1 << 15), /* System error on the PCI bus */
+	TimerIntr	= (1 << 14), /* Asserted when TCTR reaches TimerInt value */
+	LenChg		= (1 << 13), /* Cable length change */
+	SWInt		= (1 << 8),  /* Software-requested interrupt */
+	TxEmpty		= (1 << 7),  /* No Tx descriptors available */
+	RxFIFOOvr	= (1 << 6),  /* Rx FIFO Overflow */
+	LinkChg		= (1 << 5),  /* Packet underrun, or link change */
+	RxEmpty		= (1 << 4),  /* No Rx descriptors available */
+	TxErr		= (1 << 3),  /* Tx error */
+	TxOK		= (1 << 2),  /* Tx packet sent */
+	RxErr		= (1 << 1),  /* Rx error */
+	RxOK		= (1 << 0),  /* Rx packet received */
+	IntrResvd	= (1 << 10), /* reserved, according to RealTek engineers,
+					but hardware likes to raise it */
+
+	IntrAll		= PciErr | TimerIntr | LenChg | SWInt | TxEmpty |
+			  RxFIFOOvr | LinkChg | RxEmpty | TxErr | TxOK |
+			  RxErr | RxOK | IntrResvd,
+
+	/* C mode command register */
+	CmdReset	= (1 << 4),  /* Enable to reset; self-clearing */
+	RxOn		= (1 << 3),  /* Rx mode enable */
+	TxOn		= (1 << 2),  /* Tx mode enable */
+
+	/* C+ mode command register */
+	RxVlanOn	= (1 << 6),  /* Rx VLAN de-tagging enable */
+	RxChkSum	= (1 << 5),  /* Rx checksum offload enable */
+	PCIDAC		= (1 << 4),  /* PCI Dual Address Cycle (64-bit PCI) */
+	PCIMulRW	= (1 << 3),  /* Enable PCI read/write multiple */
+	CpRxOn		= (1 << 1),  /* Rx mode enable */
+	CpTxOn		= (1 << 0),  /* Tx mode enable */
+
+	/* Cfg9436 EEPROM control register */
+	Cfg9346_Lock	= 0x00,	     /* Lock ConfigX/MII register access */
+	Cfg9346_Unlock	= 0xC0,	     /* Unlock ConfigX/MII register access */
+
+	/* TxConfig register */
+	IFG		= (1 << 25) | (1 << 24), /* standard IEEE interframe gap */
+	TxDMAShift	= 8,	     /* DMA burst value (0-7) is shift this many bits */
+
+	/* Early Tx Threshold register */
+	TxThreshMask	= 0x3f,	     /* Mask bits 5-0 */
+	TxThreshMax	= 2048,	     /* Max early Tx threshold */
+
+	/* Config1 register */
+	DriverLoaded	= (1 << 5),  /* Software marker, driver is loaded */
+	LWACT           = (1 << 4),  /* LWAKE active mode */
+	PMEnable	= (1 << 0),  /* Enable various PM features of chip */
+
+	/* Config3 register */
+	PARMEnable	= (1 << 6),  /* Enable auto-loading of PHY parms */
+	MagicPacket     = (1 << 5),  /* Wake up when receives a Magic Packet */
+	LinkUp          = (1 << 4),  /* Wake up when the cable connection is re-established */
+
+	/* Config4 register */
+	LWPTN           = (1 << 1),  /* LWAKE Pattern */
+	LWPME           = (1 << 4),  /* LANWAKE vs PMEB */
+
+	/* Config5 register */
+	BWF             = (1 << 6),  /* Accept Broadcast wakeup frame */
+	MWF             = (1 << 5),  /* Accept Multicast wakeup frame */
+	UWF             = (1 << 4),  /* Accept Unicast wakeup frame */
+	LANWake         = (1 << 1),  /* Enable LANWake signal */
+	PMEStatus	= (1 << 0),  /* PME status can be reset by PCI RST# */
+
+	cp_norx_intr_mask = PciErr | LinkChg | TxOK | TxErr | TxEmpty,
+	cp_rx_intr_mask = RxOK | RxErr | RxEmpty | RxFIFOOvr,
+	cp_intr_mask = cp_rx_intr_mask | cp_norx_intr_mask,
+};
+
+static const unsigned int cp_rx_config =
+	  (RX_FIFO_THRESH << RxCfgFIFOShift) |
+	  (RX_DMA_BURST << RxCfgDMAShift);
+
+struct cp_desc {
+	u32		opts1;
+	u32		opts2;
+	u64		addr;
+};
+
+struct ring_info {
+	struct sk_buff		*skb;
+	dma_addr_t		mapping;
+	unsigned		frag;
+};
+
+struct cp_dma_stats {
+	u64			tx_ok;
+	u64			rx_ok;
+	u64			tx_err;
+	u32			rx_err;
+	u16			rx_fifo;
+	u16			frame_align;
+	u32			tx_ok_1col;
+	u32			tx_ok_mcol;
+	u64			rx_ok_phys;
+	u64			rx_ok_bcast;
+	u32			rx_ok_mcast;
+	u16			tx_abort;
+	u16			tx_underrun;
+} __attribute__((packed));
+
+struct cp_extra_stats {
+	unsigned long		rx_frags;
+};
+
+struct cp_private {
+	void			__iomem *regs;
+	struct net_device	*dev;
+	spinlock_t		lock;
+	u32			msg_enable;
+
+	struct pci_dev		*pdev;
+	u32			rx_config;
+	u16			cpcmd;
+
+	struct net_device_stats net_stats;
+	struct cp_extra_stats	cp_stats;
+	struct cp_dma_stats	*nic_stats;
+	dma_addr_t		nic_stats_dma;
+
+	unsigned		rx_tail		____cacheline_aligned;
+	struct cp_desc		*rx_ring;
+	struct ring_info	rx_skb[CP_RX_RING_SIZE];
+	unsigned		rx_buf_sz;
+
+	unsigned		tx_head		____cacheline_aligned;
+	unsigned		tx_tail;
+
+	struct cp_desc		*tx_ring;
+	struct ring_info	tx_skb[CP_TX_RING_SIZE];
+	dma_addr_t		ring_dma;
+
+#if CP_VLAN_TAG_USED
+	struct vlan_group	*vlgrp;
+#endif
+
+	unsigned int		wol_enabled : 1; /* Is Wake-on-LAN enabled? */
+
+	struct mii_if_info	mii_if;
+};
+
+#define cpr8(reg)	readb(cp->regs + (reg))
+#define cpr16(reg)	readw(cp->regs + (reg))
+#define cpr32(reg)	readl(cp->regs + (reg))
+#define cpw8(reg,val)	writeb((val), cp->regs + (reg))
+#define cpw16(reg,val)	writew((val), cp->regs + (reg))
+#define cpw32(reg,val)	writel((val), cp->regs + (reg))
+#define cpw8_f(reg,val) do {			\
+	writeb((val), cp->regs + (reg));	\
+	readb(cp->regs + (reg));		\
+	} while (0)
+#define cpw16_f(reg,val) do {			\
+	writew((val), cp->regs + (reg));	\
+	readw(cp->regs + (reg));		\
+	} while (0)
+#define cpw32_f(reg,val) do {			\
+	writel((val), cp->regs + (reg));	\
+	readl(cp->regs + (reg));		\
+	} while (0)
+
+
+static void __cp_set_rx_mode (struct net_device *dev);
+static void cp_tx (struct cp_private *cp);
+static void cp_clean_rings (struct cp_private *cp);
+
+static struct pci_device_id cp_pci_tbl[] = {
+	{ PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
+	{ PCI_VENDOR_ID_TTTECH, PCI_DEVICE_ID_TTTECH_MC322,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
+	{ },
+};
+MODULE_DEVICE_TABLE(pci, cp_pci_tbl);
+
+static struct {
+	const char str[ETH_GSTRING_LEN];
+} ethtool_stats_keys[] = {
+	{ "tx_ok" },
+	{ "rx_ok" },
+	{ "tx_err" },
+	{ "rx_err" },
+	{ "rx_fifo" },
+	{ "frame_align" },
+	{ "tx_ok_1col" },
+	{ "tx_ok_mcol" },
+	{ "rx_ok_phys" },
+	{ "rx_ok_bcast" },
+	{ "rx_ok_mcast" },
+	{ "tx_abort" },
+	{ "tx_underrun" },
+	{ "rx_frags" },
+};
+
+
+#if CP_VLAN_TAG_USED
+static void cp_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	cp->vlgrp = grp;
+	cp->cpcmd |= RxVlanOn;
+	cpw16(CpCmd, cp->cpcmd);
+	spin_unlock_irqrestore(&cp->lock, flags);
+}
+
+static void cp_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	cp->cpcmd &= ~RxVlanOn;
+	cpw16(CpCmd, cp->cpcmd);
+	if (cp->vlgrp)
+		cp->vlgrp->vlan_devices[vid] = NULL;
+	spin_unlock_irqrestore(&cp->lock, flags);
+}
+#endif /* CP_VLAN_TAG_USED */
+
+static inline void cp_set_rxbufsize (struct cp_private *cp)
+{
+	unsigned int mtu = cp->dev->mtu;
+	
+	if (mtu > ETH_DATA_LEN)
+		/* MTU + ethernet header + FCS + optional VLAN tag */
+		cp->rx_buf_sz = mtu + ETH_HLEN + 8;
+	else
+		cp->rx_buf_sz = PKT_BUF_SZ;
+}
+
+static inline void cp_rx_skb (struct cp_private *cp, struct sk_buff *skb,
+			      struct cp_desc *desc)
+{
+	skb->protocol = eth_type_trans (skb, cp->dev);
+
+	cp->net_stats.rx_packets++;
+	cp->net_stats.rx_bytes += skb->len;
+	cp->dev->last_rx = jiffies;
+
+#if CP_VLAN_TAG_USED
+	if (cp->vlgrp && (desc->opts2 & RxVlanTagged)) {
+		vlan_hwaccel_receive_skb(skb, cp->vlgrp,
+					 be16_to_cpu(desc->opts2 & 0xffff));
+	} else
+#endif
+		netif_receive_skb(skb);
+}
+
+static void cp_rx_err_acct (struct cp_private *cp, unsigned rx_tail,
+			    u32 status, u32 len)
+{
+	if (netif_msg_rx_err (cp))
+		printk (KERN_DEBUG
+			"%s: rx err, slot %d status 0x%x len %d\n",
+			cp->dev->name, rx_tail, status, len);
+	cp->net_stats.rx_errors++;
+	if (status & RxErrFrame)
+		cp->net_stats.rx_frame_errors++;
+	if (status & RxErrCRC)
+		cp->net_stats.rx_crc_errors++;
+	if ((status & RxErrRunt) || (status & RxErrLong))
+		cp->net_stats.rx_length_errors++;
+	if ((status & (FirstFrag | LastFrag)) != (FirstFrag | LastFrag))
+		cp->net_stats.rx_length_errors++;
+	if (status & RxErrFIFO)
+		cp->net_stats.rx_fifo_errors++;
+}
+
+static inline unsigned int cp_rx_csum_ok (u32 status)
+{
+	unsigned int protocol = (status >> 16) & 0x3;
+	
+	if (likely((protocol == RxProtoTCP) && (!(status & TCPFail))))
+		return 1;
+	else if ((protocol == RxProtoUDP) && (!(status & UDPFail)))
+		return 1;
+	else if ((protocol == RxProtoIP) && (!(status & IPFail)))
+		return 1;
+	return 0;
+}
+
+static int cp_rx_poll (struct net_device *dev, int *budget)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	unsigned rx_tail = cp->rx_tail;
+	unsigned rx_work = dev->quota;
+	unsigned rx;
+
+rx_status_loop:
+	rx = 0;
+	cpw16(IntrStatus, cp_rx_intr_mask);
+
+	while (1) {
+		u32 status, len;
+		dma_addr_t mapping;
+		struct sk_buff *skb, *new_skb;
+		struct cp_desc *desc;
+		unsigned buflen;
+
+		skb = cp->rx_skb[rx_tail].skb;
+		if (!skb)
+			BUG();
+
+		desc = &cp->rx_ring[rx_tail];
+		status = le32_to_cpu(desc->opts1);
+		if (status & DescOwn)
+			break;
+
+		len = (status & 0x1fff) - 4;
+		mapping = cp->rx_skb[rx_tail].mapping;
+
+		if ((status & (FirstFrag | LastFrag)) != (FirstFrag | LastFrag)) {
+			/* we don't support incoming fragmented frames.
+			 * instead, we attempt to ensure that the
+			 * pre-allocated RX skbs are properly sized such
+			 * that RX fragments are never encountered
+			 */
+			cp_rx_err_acct(cp, rx_tail, status, len);
+			cp->net_stats.rx_dropped++;
+			cp->cp_stats.rx_frags++;
+			goto rx_next;
+		}
+
+		if (status & (RxError | RxErrFIFO)) {
+			cp_rx_err_acct(cp, rx_tail, status, len);
+			goto rx_next;
+		}
+
+		if (netif_msg_rx_status(cp))
+			printk(KERN_DEBUG "%s: rx slot %d status 0x%x len %d\n",
+			       cp->dev->name, rx_tail, status, len);
+
+		buflen = cp->rx_buf_sz + RX_OFFSET;
+		new_skb = dev_alloc_skb (buflen);
+		if (!new_skb) {
+			cp->net_stats.rx_dropped++;
+			goto rx_next;
+		}
+
+		skb_reserve(new_skb, RX_OFFSET);
+		new_skb->dev = cp->dev;
+
+		pci_unmap_single(cp->pdev, mapping,
+				 buflen, PCI_DMA_FROMDEVICE);
+
+		/* Handle checksum offloading for incoming packets. */
+		if (cp_rx_csum_ok(status))
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		else
+			skb->ip_summed = CHECKSUM_NONE;
+
+		skb_put(skb, len);
+
+		mapping =
+		cp->rx_skb[rx_tail].mapping =
+			pci_map_single(cp->pdev, new_skb->tail,
+				       buflen, PCI_DMA_FROMDEVICE);
+		cp->rx_skb[rx_tail].skb = new_skb;
+
+		cp_rx_skb(cp, skb, desc);
+		rx++;
+
+rx_next:
+		cp->rx_ring[rx_tail].opts2 = 0;
+		cp->rx_ring[rx_tail].addr = cpu_to_le64(mapping);
+		if (rx_tail == (CP_RX_RING_SIZE - 1))
+			desc->opts1 = cpu_to_le32(DescOwn | RingEnd |
+						  cp->rx_buf_sz);
+		else
+			desc->opts1 = cpu_to_le32(DescOwn | cp->rx_buf_sz);
+		rx_tail = NEXT_RX(rx_tail);
+
+		if (!rx_work--)
+			break;
+	}
+
+	cp->rx_tail = rx_tail;
+
+	dev->quota -= rx;
+	*budget -= rx;
+
+	/* if we did not reach work limit, then we're done with
+	 * this round of polling
+	 */
+	if (rx_work) {
+		if (cpr16(IntrStatus) & cp_rx_intr_mask)
+			goto rx_status_loop;
+
+		local_irq_disable();
+		cpw16_f(IntrMask, cp_intr_mask);
+		__netif_rx_complete(dev);
+		local_irq_enable();
+
+		return 0;	/* done */
+	}
+
+	return 1;		/* not done */
+}
+
+static irqreturn_t
+cp_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_instance;
+	struct cp_private *cp;
+	u16 status;
+
+	if (unlikely(dev == NULL))
+		return IRQ_NONE;
+	cp = netdev_priv(dev);
+
+	status = cpr16(IntrStatus);
+	if (!status || (status == 0xFFFF))
+		return IRQ_NONE;
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: intr, status %04x cmd %02x cpcmd %04x\n",
+		        dev->name, status, cpr8(Cmd), cpr16(CpCmd));
+
+	cpw16(IntrStatus, status & ~cp_rx_intr_mask);
+
+	spin_lock(&cp->lock);
+
+	/* close possible race's with dev_close */
+	if (unlikely(!netif_running(dev))) {
+		cpw16(IntrMask, 0);
+		spin_unlock(&cp->lock);
+		return IRQ_HANDLED;
+	}
+
+	if (status & (RxOK | RxErr | RxEmpty | RxFIFOOvr))
+		if (netif_rx_schedule_prep(dev)) {
+			cpw16_f(IntrMask, cp_norx_intr_mask);
+			__netif_rx_schedule(dev);
+		}
+
+	if (status & (TxOK | TxErr | TxEmpty | SWInt))
+		cp_tx(cp);
+	if (status & LinkChg)
+		mii_check_media(&cp->mii_if, netif_msg_link(cp), FALSE);
+
+	spin_unlock(&cp->lock);
+
+	if (status & PciErr) {
+		u16 pci_status;
+
+		pci_read_config_word(cp->pdev, PCI_STATUS, &pci_status);
+		pci_write_config_word(cp->pdev, PCI_STATUS, pci_status);
+		printk(KERN_ERR "%s: PCI bus error, status=%04x, PCI status=%04x\n",
+		       dev->name, status, pci_status);
+
+		/* TODO: reset hardware */
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void cp_tx (struct cp_private *cp)
+{
+	unsigned tx_head = cp->tx_head;
+	unsigned tx_tail = cp->tx_tail;
+
+	while (tx_tail != tx_head) {
+		struct sk_buff *skb;
+		u32 status;
+
+		rmb();
+		status = le32_to_cpu(cp->tx_ring[tx_tail].opts1);
+		if (status & DescOwn)
+			break;
+
+		skb = cp->tx_skb[tx_tail].skb;
+		if (!skb)
+			BUG();
+
+		pci_unmap_single(cp->pdev, cp->tx_skb[tx_tail].mapping,
+					skb->len, PCI_DMA_TODEVICE);
+
+		if (status & LastFrag) {
+			if (status & (TxError | TxFIFOUnder)) {
+				if (netif_msg_tx_err(cp))
+					printk(KERN_DEBUG "%s: tx err, status 0x%x\n",
+					       cp->dev->name, status);
+				cp->net_stats.tx_errors++;
+				if (status & TxOWC)
+					cp->net_stats.tx_window_errors++;
+				if (status & TxMaxCol)
+					cp->net_stats.tx_aborted_errors++;
+				if (status & TxLinkFail)
+					cp->net_stats.tx_carrier_errors++;
+				if (status & TxFIFOUnder)
+					cp->net_stats.tx_fifo_errors++;
+			} else {
+				cp->net_stats.collisions +=
+					((status >> TxColCntShift) & TxColCntMask);
+				cp->net_stats.tx_packets++;
+				cp->net_stats.tx_bytes += skb->len;
+				if (netif_msg_tx_done(cp))
+					printk(KERN_DEBUG "%s: tx done, slot %d\n", cp->dev->name, tx_tail);
+			}
+			dev_kfree_skb_irq(skb);
+		}
+
+		cp->tx_skb[tx_tail].skb = NULL;
+
+		tx_tail = NEXT_TX(tx_tail);
+	}
+
+	cp->tx_tail = tx_tail;
+
+	if (TX_BUFFS_AVAIL(cp) > (MAX_SKB_FRAGS + 1))
+		netif_wake_queue(cp->dev);
+}
+
+static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	unsigned entry;
+	u32 eor;
+#if CP_VLAN_TAG_USED
+	u32 vlan_tag = 0;
+#endif
+
+	spin_lock_irq(&cp->lock);
+
+	/* This is a hard error, log it. */
+	if (TX_BUFFS_AVAIL(cp) <= (skb_shinfo(skb)->nr_frags + 1)) {
+		netif_stop_queue(dev);
+		spin_unlock_irq(&cp->lock);
+		printk(KERN_ERR PFX "%s: BUG! Tx Ring full when queue awake!\n",
+		       dev->name);
+		return 1;
+	}
+
+#if CP_VLAN_TAG_USED
+	if (cp->vlgrp && vlan_tx_tag_present(skb))
+		vlan_tag = TxVlanTag | cpu_to_be16(vlan_tx_tag_get(skb));
+#endif
+
+	entry = cp->tx_head;
+	eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
+	if (skb_shinfo(skb)->nr_frags == 0) {
+		struct cp_desc *txd = &cp->tx_ring[entry];
+		u32 len;
+		dma_addr_t mapping;
+
+		len = skb->len;
+		mapping = pci_map_single(cp->pdev, skb->data, len, PCI_DMA_TODEVICE);
+		CP_VLAN_TX_TAG(txd, vlan_tag);
+		txd->addr = cpu_to_le64(mapping);
+		wmb();
+
+		if (skb->ip_summed == CHECKSUM_HW) {
+			const struct iphdr *ip = skb->nh.iph;
+			if (ip->protocol == IPPROTO_TCP)
+				txd->opts1 = cpu_to_le32(eor | len | DescOwn |
+							 FirstFrag | LastFrag |
+							 IPCS | TCPCS);
+			else if (ip->protocol == IPPROTO_UDP)
+				txd->opts1 = cpu_to_le32(eor | len | DescOwn |
+							 FirstFrag | LastFrag |
+							 IPCS | UDPCS);
+			else
+				BUG();
+		} else
+			txd->opts1 = cpu_to_le32(eor | len | DescOwn |
+						 FirstFrag | LastFrag);
+		wmb();
+
+		cp->tx_skb[entry].skb = skb;
+		cp->tx_skb[entry].mapping = mapping;
+		cp->tx_skb[entry].frag = 0;
+		entry = NEXT_TX(entry);
+	} else {
+		struct cp_desc *txd;
+		u32 first_len, first_eor;
+		dma_addr_t first_mapping;
+		int frag, first_entry = entry;
+		const struct iphdr *ip = skb->nh.iph;
+
+		/* We must give this initial chunk to the device last.
+		 * Otherwise we could race with the device.
+		 */
+		first_eor = eor;
+		first_len = skb_headlen(skb);
+		first_mapping = pci_map_single(cp->pdev, skb->data,
+					       first_len, PCI_DMA_TODEVICE);
+		cp->tx_skb[entry].skb = skb;
+		cp->tx_skb[entry].mapping = first_mapping;
+		cp->tx_skb[entry].frag = 1;
+		entry = NEXT_TX(entry);
+
+		for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
+			skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
+			u32 len;
+			u32 ctrl;
+			dma_addr_t mapping;
+
+			len = this_frag->size;
+			mapping = pci_map_single(cp->pdev,
+						 ((void *) page_address(this_frag->page) +
+						  this_frag->page_offset),
+						 len, PCI_DMA_TODEVICE);
+			eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
+
+			if (skb->ip_summed == CHECKSUM_HW) {
+				ctrl = eor | len | DescOwn | IPCS;
+				if (ip->protocol == IPPROTO_TCP)
+					ctrl |= TCPCS;
+				else if (ip->protocol == IPPROTO_UDP)
+					ctrl |= UDPCS;
+				else
+					BUG();
+			} else
+				ctrl = eor | len | DescOwn;
+
+			if (frag == skb_shinfo(skb)->nr_frags - 1)
+				ctrl |= LastFrag;
+
+			txd = &cp->tx_ring[entry];
+			CP_VLAN_TX_TAG(txd, vlan_tag);
+			txd->addr = cpu_to_le64(mapping);
+			wmb();
+
+			txd->opts1 = cpu_to_le32(ctrl);
+			wmb();
+
+			cp->tx_skb[entry].skb = skb;
+			cp->tx_skb[entry].mapping = mapping;
+			cp->tx_skb[entry].frag = frag + 2;
+			entry = NEXT_TX(entry);
+		}
+
+		txd = &cp->tx_ring[first_entry];
+		CP_VLAN_TX_TAG(txd, vlan_tag);
+		txd->addr = cpu_to_le64(first_mapping);
+		wmb();
+
+		if (skb->ip_summed == CHECKSUM_HW) {
+			if (ip->protocol == IPPROTO_TCP)
+				txd->opts1 = cpu_to_le32(first_eor | first_len |
+							 FirstFrag | DescOwn |
+							 IPCS | TCPCS);
+			else if (ip->protocol == IPPROTO_UDP)
+				txd->opts1 = cpu_to_le32(first_eor | first_len |
+							 FirstFrag | DescOwn |
+							 IPCS | UDPCS);
+			else
+				BUG();
+		} else
+			txd->opts1 = cpu_to_le32(first_eor | first_len |
+						 FirstFrag | DescOwn);
+		wmb();
+	}
+	cp->tx_head = entry;
+	if (netif_msg_tx_queued(cp))
+		printk(KERN_DEBUG "%s: tx queued, slot %d, skblen %d\n",
+		       dev->name, entry, skb->len);
+	if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1))
+		netif_stop_queue(dev);
+
+	spin_unlock_irq(&cp->lock);
+
+	cpw8(TxPoll, NormalTxPoll);
+	dev->trans_start = jiffies;
+
+	return 0;
+}
+
+/* Set or clear the multicast filter for this adaptor.
+   This routine is not state sensitive and need not be SMP locked. */
+
+static void __cp_set_rx_mode (struct net_device *dev)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	u32 mc_filter[2];	/* Multicast hash filter */
+	int i, rx_mode;
+	u32 tmp;
+
+	/* Note: do not reorder, GCC is clever about common statements. */
+	if (dev->flags & IFF_PROMISC) {
+		/* Unconditionally log net taps. */
+		printk (KERN_NOTICE "%s: Promiscuous mode enabled.\n",
+			dev->name);
+		rx_mode =
+		    AcceptBroadcast | AcceptMulticast | AcceptMyPhys |
+		    AcceptAllPhys;
+		mc_filter[1] = mc_filter[0] = 0xffffffff;
+	} else if ((dev->mc_count > multicast_filter_limit)
+		   || (dev->flags & IFF_ALLMULTI)) {
+		/* Too many to filter perfectly -- accept all multicasts. */
+		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
+		mc_filter[1] = mc_filter[0] = 0xffffffff;
+	} else {
+		struct dev_mc_list *mclist;
+		rx_mode = AcceptBroadcast | AcceptMyPhys;
+		mc_filter[1] = mc_filter[0] = 0;
+		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
+		     i++, mclist = mclist->next) {
+			int bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
+
+			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
+			rx_mode |= AcceptMulticast;
+		}
+	}
+
+	/* We can safely update without stopping the chip. */
+	tmp = cp_rx_config | rx_mode;
+	if (cp->rx_config != tmp) {
+		cpw32_f (RxConfig, tmp);
+		cp->rx_config = tmp;
+	}
+	cpw32_f (MAR0 + 0, mc_filter[0]);
+	cpw32_f (MAR0 + 4, mc_filter[1]);
+}
+
+static void cp_set_rx_mode (struct net_device *dev)
+{
+	unsigned long flags;
+	struct cp_private *cp = netdev_priv(dev);
+
+	spin_lock_irqsave (&cp->lock, flags);
+	__cp_set_rx_mode(dev);
+	spin_unlock_irqrestore (&cp->lock, flags);
+}
+
+static void __cp_get_stats(struct cp_private *cp)
+{
+	/* only lower 24 bits valid; write any value to clear */
+	cp->net_stats.rx_missed_errors += (cpr32 (RxMissed) & 0xffffff);
+	cpw32 (RxMissed, 0);
+}
+
+static struct net_device_stats *cp_get_stats(struct net_device *dev)
+{
+	struct cp_private *cp = netdev_priv(dev);
+	unsigned long flags;
+
+	/* The chip only need report frame silently dropped. */
+	spin_lock_irqsave(&cp->lock, flags);
+ 	if (netif_running(dev) && netif_device_present(dev))
+ 		__cp_get_stats(cp);
+	spin_unlock_irqrestore(&cp->lock, flags);
+
+	return &cp->net_stats;
+}
+
+static void cp_stop_hw (struct cp_private *cp)
+{
+	cpw16(IntrStatus, ~(cpr16(IntrStatus)));
+	cpw16_f(IntrMask, 0);
+	cpw8(Cmd, 0);
+	cpw16_f(CpCmd, 0);
+	cpw16_f(IntrStatus, ~(cpr16(IntrStatus)));
+
+	cp->rx_tail = 0;
+	cp->tx_head = cp->tx_tail = 0;
+}
+
+static void cp_reset_hw (struct cp_private *cp)
+{
+	unsigned work = 1000;
+
+	cpw8(Cmd, CmdReset);
+
+	while (work--) {
+		if (!(cpr8(Cmd) & CmdReset))
+			return;
+
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(10);
+	}
+
+	printk(KERN_ERR "%s: hardware reset timeout\n", cp->dev->name);
+}
+
+static inline void cp_start_hw (struct cp_private *cp)
+{
+	cpw16(CpCmd, cp->cpcmd);
+	cpw8(Cmd, RxOn | TxOn);
+}
+
+static void cp_init_hw (struct cp_private *cp)
+{
+	struct net_device *dev = cp->dev;
+	dma_addr_t ring_dma;
+
+	cp_reset_hw(cp);
+
+	cpw8_f (Cfg9346, Cfg9346_Unlock);
+
+	/* Restore our idea of the MAC address. */
+	cpw32_f (MAC0 + 0, cpu_to_le32 (*(u32 *) (dev->dev_addr + 0)));
+	cpw32_f (MAC0 + 4, cpu_to_le32 (*(u32 *) (dev->dev_addr + 4)));
+
+	cp_start_hw(cp);
+	cpw8(TxThresh, 0x06); /* XXX convert magic num to a constant */
+
+	__cp_set_rx_mode(dev);
+	cpw32_f (TxConfig, IFG | (TX_DMA_BURST << TxDMAShift));
+
+	cpw8(Config1, cpr8(Config1) | DriverLoaded | PMEnable);
+	/* Disable Wake-on-LAN. Can be turned on with ETHTOOL_SWOL */
+	cpw8(Config3, PARMEnable);
+	cp->wol_enabled = 0;
+
+	cpw8(Config5, cpr8(Config5) & PMEStatus); 
+
+	cpw32_f(HiTxRingAddr, 0);
+	cpw32_f(HiTxRingAddr + 4, 0);
+
+	ring_dma = cp->ring_dma;
+	cpw32_f(RxRingAddr, ring_dma & 0xffffffff);
+	cpw32_f(RxRingAddr + 4, (ring_dma >> 16) >> 16);
+
+	ring_dma += sizeof(struct cp_desc) * CP_RX_RING_SIZE;
+	cpw32_f(TxRingAddr, ring_dma & 0xffffffff);
+	cpw32_f(TxRingAddr + 4, (ring_dma >> 16) >> 16);
+
+	cpw16(MultiIntr, 0);
+
+	cpw16_f(IntrMask, cp_intr_mask);
+
+	cpw8_f(Cfg9346, Cfg9346_Lock);
+}
+
+static int cp_refill_rx (struct cp_private *cp)
+{
+	unsigned i;
+
+	for (i = 0; i < CP_RX_RING_SIZE; i++) {
+		struct sk_buff *skb;
+
+		skb = dev_alloc_skb(cp->rx_buf_sz + RX_OFFSET);
+		if (!skb)
+			goto err_out;
+
+		skb->dev = cp->dev;
+		skb_reserve(skb, RX_OFFSET);
+
+		cp->rx_skb[i].mapping = pci_map_single(cp->pdev,
+			skb->tail, cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+		cp->rx_skb[i].skb = skb;
+		cp->rx_skb[i].frag = 0;
+
+		cp->rx_ring[i].opts2 = 0;
+		cp->rx_ring[i].addr = cpu_to_le64(cp->rx_skb[i].mapping);
+		if (i == (CP_RX_RING_SIZE - 1))
+			cp->rx_ring[i].opts1 =
+				cpu_to_le32(DescOwn | RingEnd | cp->rx_buf_sz);
+		else
+			cp->rx_ring[i].opts1 =
+				cpu_to_le32(DescOwn | cp->rx_buf_sz);
+	}
+
+	return 0;
+
+err_out:
+	cp_clean_rings(cp);
+	return -ENOMEM;
+}
+
+static int cp_init_rings (struct cp_private *cp)
+{