patch-2.4.25 linux-2.4.25/drivers/net/meth.c

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diff -urN linux-2.4.24/drivers/net/meth.c linux-2.4.25/drivers/net/meth.c
@@ -1,863 +0,0 @@
-/*
- * meth.c -- O2 Builtin 10/100 Ethernet driver
- *
- * Copyright (C) 2001 Ilya Volynets
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; either version
- *	2 of the License, or (at your option) any later version.
- */
-#include <linux/module.h>
-#include <linux/init.h>
-
-#include <linux/sched.h>
-#include <linux/kernel.h> /* printk() */
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/errno.h>  /* error codes */
-#include <linux/types.h>  /* size_t */
-#include <linux/interrupt.h> /* mark_bh */
-#include <linux/pci.h>
-
-#include <linux/in.h>
-#include <linux/netdevice.h>   /* struct device, and other headers */
-#include <linux/etherdevice.h> /* eth_type_trans */
-#include <linux/ip.h>          /* struct iphdr */
-#include <linux/tcp.h>         /* struct tcphdr */
-#include <linux/skbuff.h>
-#include <linux/mii.h> /*MII definitions */
-
-#include <asm/ip32/crime.h>
-#include <asm/ip32/mace.h>
-#include <asm/ip32/ip32_ints.h>
-
-#include "meth.h"
-
-#include <linux/in6.h>
-#include <asm/checksum.h>
-
-#ifndef MFE_DEBUG
-#define MFE_DEBUG 0
-#endif
-
-#if MFE_DEBUG>=1
-#define DPRINTK(str,args...) printk (KERN_DEBUG "meth(%ld): %s: " str, jiffies, __FUNCTION__ , ## args)
-#define MFE_RX_DEBUG 2
-#else
-#define DPRINTK(str,args...)
-#define MFE_RX_DEBUG 0
-#endif
-
-
-static const char *version="meth.c: Ilya Volynets (ilya@theIlya.com)";
-static const char *meth_str="SGI O2 Fast Ethernet";
-MODULE_AUTHOR("Ilya Volynets");
-MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
-
-/* This is a load-time options */
-/*static int eth = 0;
-MODULE_PARM(eth, "i");*/
-
-#define HAVE_TX_TIMEOUT
-/* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
-#define TX_TIMEOUT (400*HZ/1000)
-
-#ifdef HAVE_TX_TIMEOUT
-static int timeout = TX_TIMEOUT;
-MODULE_PARM(timeout, "i");
-#endif
-
-int meth_eth;
-
-
-/*
- * This structure is private to each device. It is used to pass
- * packets in and out, so there is place for a packet
- */
-
-typedef struct meth_private {
-    struct net_device_stats stats;
-	volatile struct meth_regs *regs;
-	u64 mode; /* in-memory copy of MAC control register */
-	int  phy_addr; /* address of phy, used by mdio_* functions, initialized in mdio_probe*/
-	tx_packet *tx_ring;
-	dma_addr_t tx_ring_dma;
-	int free_space;
-	struct sk_buff *tx_skbs[TX_RING_ENTRIES];
-	dma_addr_t      tx_skb_dmas[TX_RING_ENTRIES];
-	int tx_read,tx_write;
-	int tx_count;
-
-	rx_packet *rx_ring[RX_RING_ENTRIES];
-	dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
-	int rx_write;
-
-    spinlock_t meth_lock;
-} meth_private;
-
-extern struct net_device meth_devs[];
-void meth_tx_timeout (struct net_device *dev);
-void meth_interrupt(int irq, void *dev_id, struct pt_regs *pregs);
-        
-/* global, initialized in ip32-setup.c */
-char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
-
-static inline void load_eaddr(struct net_device *dev,
-			      volatile struct meth_regs *regs)
-{
-	int i;
-	DPRINTK("Loading MAC Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
-		(int)o2meth_eaddr[0]&0xFF,(int)o2meth_eaddr[1]&0xFF,(int)o2meth_eaddr[2]&0xFF,
-		(int)o2meth_eaddr[3]&0xFF,(int)o2meth_eaddr[4]&0xFF,(int)o2meth_eaddr[5]&0xFF);
-	//memcpy(dev->dev_addr,o2meth_eaddr+2,6);
-	for (i=0; i<6; i++)
-		dev->dev_addr[i]=o2meth_eaddr[i];
-	regs->mac_addr= //dev->dev_addr[0]|(dev->dev_addr[1]<<8)|
-					//dev->dev_addr[2]<<16|(dev->dev_addr[3]<<24)|
-					//dev->dev_addr[4]<<32|(dev->dev_addr[5]<<40);
-	(*(u64*)o2meth_eaddr)>>16;
-	DPRINTK("MAC, finally is %0lx\n",regs->mac_addr);
-}
-
-/*
- *Waits for BUSY status of mdio bus to clear
- */
-#define WAIT_FOR_PHY(___regs, ___rval)			\
-	while((___rval=___regs->phy_data)&MDIO_BUSY){	\
-		udelay(25);								\
-	}
-/*read phy register, return value read */
-static int mdio_read(meth_private *priv,int phyreg)
-{
-	volatile meth_regs* regs=priv->regs;
-	volatile u32 rval;
-	WAIT_FOR_PHY(regs,rval)
-	regs->phy_registers=(priv->phy_addr<<5)|(phyreg&0x1f);
-	udelay(25);
-	regs->phy_trans_go=1;
-	udelay(25);
-	WAIT_FOR_PHY(regs,rval)
-	return rval&MDIO_DATA_MASK;
-}
-
-/*write phy register */
-static void mdio_write(meth_private* priv,int pfyreg,int val)
-{
-	volatile meth_regs* regs=priv->regs;
-	int rval;
-///	DPRINTK("Trying to write value %i to reguster %i\n",val, pfyreg);
-	spin_lock_irq(&priv->meth_lock);
-	WAIT_FOR_PHY(regs,rval)
-	regs->phy_registers=(priv->phy_addr<<5)|(pfyreg&0x1f);
-	regs->phy_data=val;
-	udelay(25);
-	WAIT_FOR_PHY(regs,rval)
-	spin_unlock_irq(&priv->meth_lock);
-}
-
-/* Modify phy register using given mask and value */
-static void mdio_update(meth_private* priv,int phyreg, int val, int mask)
-{
-	int rval;
-	DPRINTK("RMW value %i to PHY register %i with mask %i\n",val,phyreg,mask);
-	rval=mdio_read(priv,phyreg);
-	rval=(rval&~mask)|(val&mask);
-	mdio_write(priv,phyreg,rval);
-}
-
-/* handle errata data on MDIO bus */
-//static void mdio_errata(meth_private *priv)
-//{
-	/* Hmmm... what the hell is phyerrata? does it come from sys init parameters in IRIX */
-//}
-static int mdio_probe(meth_private *priv)
-{
-	int i, p2, p3;
-	DPRINTK("Detecting PHY kind\n");
-	/* check if phy is detected already */
-	if(priv->phy_addr>=0&&priv->phy_addr<32)
-		return 0;
-	spin_lock_irq(&priv->meth_lock);
-	for (i=0;i<32;++i){
-		priv->phy_addr=(char)i;
-		p2=mdio_read(priv,2);
-#ifdef MFE_DEBUG
-		p3=mdio_read(priv,3);
-		switch ((p2<<12)|(p3>>4)){
-			case PHY_QS6612X:
-				DPRINTK("PHY is QS6612X\n");
-				break;
-			case PHY_ICS1889:
-				DPRINTK("PHY is ICS1889\n");
-				break;
-			case PHY_ICS1890:
-				DPRINTK("PHY is ICS1890\n");
-				break;
-			case PHY_DP83840:
-				DPRINTK("PHY is DP83840\n");
-				break;
-		}
-#endif
-		if(p2!=0xffff&&p2!=0x0000){
-			DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
-			break;
-		}
-	}
-	spin_unlock_irq(&priv->meth_lock);
-	if(priv->phy_addr<32) {
-		return 0;
-	}
-	DPRINTK("Oopsie! PHY is not known!\n");
-	priv->phy_addr=-1;
-	return -ENODEV;
-}
-
-static void meth_check_link(struct net_device *dev)
-{
-	struct meth_private *priv = (struct meth_private *) dev->priv;
-	int mii_partner = mdio_read(priv, 5);
-	int mii_advertising = mdio_read(priv, 4);
-	int negotiated = mii_advertising & mii_partner;
-	int duplex, speed;
-
-	if (mii_partner == 0xffff)
-		return;
-
-	duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040)?METH_PHY_FDX:0;
-	speed = (negotiated & 0x0380)?METH_100MBIT:0;
-
-	if ((priv->mode & METH_PHY_FDX) ^ duplex)
-	{
-		DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
-		if (duplex)
-			priv->mode |= METH_PHY_FDX;
-		else
-			priv->mode &= ~METH_PHY_FDX;
-		priv->regs->mac_ctrl = priv->mode;
-	}
-
-	if ((priv->mode & METH_100MBIT) ^ speed)
-	{
-		DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
-		if (duplex)
-			priv->mode |= METH_100MBIT;
-		else
-			priv->mode &= ~METH_100MBIT;
-		priv->regs->mac_ctrl = priv->mode;
-	}
-}
-
-
-static int meth_init_tx_ring(meth_private *priv)
-{
-	/* Init TX ring */
-	DPRINTK("Initializing TX ring\n");
-	priv->tx_ring = (tx_packet *) pci_alloc_consistent(NULL,TX_RING_BUFFER_SIZE,&(priv->tx_ring_dma));
-	if(!priv->tx_ring)
-		return -ENOMEM;
-	memset(priv->tx_ring, 0, TX_RING_BUFFER_SIZE);
-	priv->tx_count = priv->tx_read = priv->tx_write = 0;
-	priv->regs->tx_ring_base = priv->tx_ring_dma;
-	priv->free_space = TX_RING_ENTRIES;
-	/* Now init skb save area */
-	memset(priv->tx_skbs,0,sizeof(priv->tx_skbs));
-	memset(priv->tx_skb_dmas,0,sizeof(priv->tx_skb_dmas));
-	DPRINTK("Done with TX ring init\n");
-	return 0;
-}
-
-static int meth_init_rx_ring(meth_private *priv)
-{
-	int i;
-	DPRINTK("Initializing RX ring\n");
-	for(i=0;i<RX_RING_ENTRIES;i++){
-		DPRINTK("\t1:\t%i\t",i);
-		/*if(!(priv->rx_ring[i]=get_free_page(GFP_KERNEL)))
-			return -ENOMEM;
-		DPRINTK("\t2:\t%i\n",i);*/
-		priv->rx_ring[i]=(rx_packet*)pci_alloc_consistent(NULL,METH_RX_BUFF_SIZE,&(priv->rx_ring_dmas[i]));
-		/* I'll need to re-sync it after each RX */
-		DPRINTK("\t%p\n",priv->rx_ring[i]);
-		priv->regs->rx_fifo=priv->rx_ring_dmas[i];
-	}
-	priv->rx_write = 0;
-	DPRINTK("Done with RX ring\n");
-	return 0;
-}
-static void meth_free_tx_ring(meth_private *priv)
-{
-	int i;
-
-	/* Remove any pending skb */
-	for (i = 0; i < TX_RING_ENTRIES; i++) {
-	  if (priv->tx_skbs[i])
-		dev_kfree_skb(priv->tx_skbs[i]);
-		priv->tx_skbs[i] = NULL;
-	}
-	pci_free_consistent(NULL,
-			    TX_RING_BUFFER_SIZE,
-			    priv->tx_ring,
-			    priv->tx_ring_dma);
-}
-static void meth_free_rx_ring(meth_private *priv)
-{
-	int i;
-
-	for(i=0;i<RX_RING_ENTRIES;i++)
-		pci_free_consistent(NULL,
-				    METH_RX_BUFF_SIZE,
-				    priv->rx_ring[i],
-				    priv->rx_ring_dmas[i]);
-}
-
-int meth_reset(struct net_device *dev)
-{
-	struct meth_private *priv = (struct meth_private *) dev->priv;
-
-	/* Reset card */
-	priv->regs->mac_ctrl = SGI_MAC_RESET;
-	priv->regs->mac_ctrl = 0;
-	udelay(25);
-	DPRINTK("MAC control after reset: %016lx\n", priv->regs->mac_ctrl);
-
-	/* Load ethernet address */
-	load_eaddr(dev, priv->regs);
-	/* Should load some "errata", but later */
-	
-	/* Check for device */
-	if(mdio_probe(priv) < 0) {
-		DPRINTK("Unable to find PHY\n");
-		return -ENODEV;
-	}
-
-	/* Initial mode -- 10|Half-duplex|Accept normal packets */
-	priv->mode=METH_ACCEPT_MCAST|METH_DEFAULT_IPG;
-	if(dev->flags | IFF_PROMISC)
-		priv->mode |= METH_PROMISC;
-	priv->regs->mac_ctrl = priv->mode;
-
-	/* Autonegociate speed and duplex mode */
-	meth_check_link(dev);
-
-	/* Now set dma control, but don't enable DMA, yet */
-	priv->regs->dma_ctrl= (4 << METH_RX_OFFSET_SHIFT) |
-		              (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
-
-	return(0);
-}
-
-/*============End Helper Routines=====================*/
-
-/*
- * Open and close
- */
-
-int meth_open(struct net_device *dev)
-{
-	meth_private *priv=dev->priv;
-	volatile meth_regs *regs=priv->regs;
-
-	MOD_INC_USE_COUNT;
-
-	/* Start DMA */
-	regs->dma_ctrl|=
-	        METH_DMA_TX_EN|/*METH_DMA_TX_INT_EN|*/
-		METH_DMA_RX_EN|METH_DMA_RX_INT_EN;
-
-	if(request_irq(dev->irq,meth_interrupt,SA_SHIRQ,meth_str,dev)){
-		printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
-		return -EAGAIN;
-	}
-	netif_start_queue(dev);
-	DPRINTK("Opened... DMA control=0x%08lx\n", regs->dma_ctrl);
-	return 0;
-}
-
-int meth_release(struct net_device *dev)
-{
-    netif_stop_queue(dev); /* can't transmit any more */
-	/* shut down dma */
-	((meth_private*)(dev->priv))->regs->dma_ctrl&=
-		~(METH_DMA_TX_EN|METH_DMA_TX_INT_EN|
-		METH_DMA_RX_EN|METH_DMA_RX_INT_EN);
-	free_irq(dev->irq, dev);
-    MOD_DEC_USE_COUNT;
-    return 0;
-}
-
-/*
- * Configuration changes (passed on by ifconfig)
- */
-int meth_config(struct net_device *dev, struct ifmap *map)
-{
-    if (dev->flags & IFF_UP) /* can't act on a running interface */
-        return -EBUSY;
-
-    /* Don't allow changing the I/O address */
-    if (map->base_addr != dev->base_addr) {
-        printk(KERN_WARNING "meth: Can't change I/O address\n");
-        return -EOPNOTSUPP;
-    }
-
-    /* Allow changing the IRQ */
-    if (map->irq != dev->irq) {
-        printk(KERN_WARNING "meth: Can't change IRQ\n");
-        return -EOPNOTSUPP;
-    }
-	DPRINTK("Configured\n");
-
-    /* ignore other fields */
-    return 0;
-}
-
-/*
- * Receive a packet: retrieve, encapsulate and pass over to upper levels
- */
-void meth_rx(struct net_device* dev)
-{
-    struct sk_buff *skb;
-    struct meth_private *priv = (struct meth_private *) dev->priv;
-	rx_packet *rxb;
-	DPRINTK("RX...\n");
-	// TEMP	while((rxb=priv->rx_ring[priv->rx_write])->status.raw&0x8000000000000000){
-	while((rxb=priv->rx_ring[priv->rx_write])->status.raw&0x8000000000000000){
-	        int len=rxb->status.parsed.rx_len - 4; /* omit CRC */
-		DPRINTK("(%i)\n",priv->rx_write);
-		/* length sanity check */
-		if(len < 60 || len > 1518) {
-		  printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x.\n",
-			 dev->name, priv->rx_write, rxb->status.raw);
-		  priv->stats.rx_errors++;
-		  priv->stats.rx_length_errors++;
-		}
-		if(!(rxb->status.raw&METH_RX_STATUS_ERRORS)){
-			skb=alloc_skb(len+2,GFP_ATOMIC);/* Should be atomic -- we are in interrupt */
-			if(!skb){
-				/* Ouch! No memory! Drop packet on the floor */
-				DPRINTK("!!!>>>Ouch! Not enough Memory for RX buffer!\n");
-				priv->stats.rx_dropped++;
-			} else {
-				skb_reserve(skb, 2); /* align IP on 16B boundary */  
-    			memcpy(skb_put(skb, len), rxb->buf, len);
-			    /* Write metadata, and then pass to the receive level */
-			    skb->dev = dev;
-			    skb->protocol = eth_type_trans(skb, dev);
-				//skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
-			   
-				DPRINTK("passing packet\n");
-				DPRINTK("len = %d rxb->status = %x\n",
-					len, rxb->status.raw);
-				netif_rx(skb);
-				dev->last_rx = jiffies;
-				priv->stats.rx_packets++;
-				priv->stats.rx_bytes+=len;
-				DPRINTK("There we go... Whew...\n");
-			}
-		}
-		priv->regs->rx_fifo=priv->rx_ring_dmas[priv->rx_write];
-		rxb->status.raw=0;		
-		priv->rx_write=(priv->rx_write+1)&(RX_RING_ENTRIES-1);
-	}
-}
-
-static int meth_tx_full(struct net_device *dev)
-{
-	struct meth_private *priv = (struct meth_private *) dev->priv;
-
-	return(priv->tx_count >= TX_RING_ENTRIES-1);
-}
-
-void meth_tx_cleanup(struct net_device* dev, int rptr)
-{
-	meth_private *priv=dev->priv;
-	tx_packet* status;
-	struct sk_buff *skb;
-
-	spin_lock(&priv->meth_lock);
-
-	/* Stop DMA */
-	priv->regs->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
-
-	while(priv->tx_read != rptr){
-		skb = priv->tx_skbs[priv->tx_read];
-		status = &priv->tx_ring[priv->tx_read];
-		if(!status->header.res.sent)
-			break;
-		if(status->header.raw & METH_TX_STATUS_DONE) {
-			priv->stats.tx_packets++;
-			priv->stats.tx_bytes += skb->len;
-		}
-		dev_kfree_skb_irq(skb);
-		priv->tx_skbs[priv->tx_read] = NULL;
-		status->header.raw = 0;
-		priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1);
-		priv->tx_count --;
-	}
-
-	/* wake up queue if it was stopped */
-	if (netif_queue_stopped(dev) && ! meth_tx_full(dev)) {
-		netif_wake_queue(dev);
-	}
-
-	spin_unlock(priv->meth_lock);
-}
-
-/*
- * The typical interrupt entry point
- */
-void meth_interrupt(int irq, void *dev_id, struct pt_regs *pregs)
-{
-	struct meth_private *priv;
-	union {
-		u32	reg; /*Whole status register */
-		struct {
-			u32			:	2,
-				rx_seq	:	5,
-				tx_read	:	9,
-				
-				rx_read	:	8,
-				int_mask:	8;
-		} parsed;
-	} status;
-	/*
-	 * As usual, check the "device" pointer for shared handlers.
-	 * Then assign "struct device *dev"
-	 */
-	struct net_device *dev = (struct net_device *)dev_id;
-	/* ... and check with hw if it's really ours */
-
-	if (!dev /*paranoid*/ ) return;
-
-	/* Lock the device */
-	priv = (struct meth_private *) dev->priv;
-
-	status.reg = priv->regs->int_flags;
-    
-	DPRINTK("Interrupt, status %08x...\n",status.reg);
-	if (status.parsed.int_mask & METH_INT_RX_THRESHOLD) {
-		/* send it to meth_rx for handling */
-		meth_rx(dev);
-	}
-
-	if (status.parsed.int_mask & (METH_INT_TX_EMPTY|METH_INT_TX_PKT)) {
-		/* a transmission is over: free the skb */
-		meth_tx_cleanup(dev, status.parsed.tx_read);
-	}
-	/* check for errors too... */
-	if (status.parsed.int_mask & (METH_INT_TX_LINK_FAIL))
-		printk(KERN_WARNING "meth: link failure\n");
-	if (status.parsed.int_mask & (METH_INT_MEM_ERROR))
-		printk(KERN_WARNING "meth: memory error\n");
-	if (status.parsed.int_mask & (METH_INT_TX_ABORT))
-		printk(KERN_WARNING "meth: aborted\n");
-	DPRINTK("Interrupt handling done...\n");
-	
-	priv->regs->int_flags=status.reg&0xff; /* clear interrupts */
-}
-
-/*
- * Transmits packets that fit into TX descriptor (are <=120B)
- */
-static void meth_tx_short_prepare(meth_private* priv, struct sk_buff* skb)
-{
-	tx_packet *desc=&priv->tx_ring[priv->tx_write];
-	int len = (skb->len<ETH_ZLEN)?ETH_ZLEN:skb->len;
-
-	DPRINTK("preparing short packet\n");
-	/* maybe I should set whole thing to 0 first... */
-	memcpy(desc->data.dt+(120-len),skb->data,skb->len);
-	if(skb->len < len)
-		memset(desc->data.dt+120-len+skb->len,0,len-skb->len);
-	desc->header.raw=METH_TX_CMD_INT_EN|(len-1)|((128-len)<<16);
-	DPRINTK("desc=%016lx\n",desc->header.raw);
-}
-#define TX_CATBUF1 BIT(25)
-static void meth_tx_1page_prepare(meth_private* priv, struct sk_buff* skb)
-{
-	tx_packet *desc=&priv->tx_ring[priv->tx_write];
-	void *buffer_data = (void *)(((u64)skb->data + 7ULL) & (~7ULL));
-	int unaligned_len = (int)((u64)buffer_data - (u64)skb->data);
-	int buffer_len = skb->len - unaligned_len;
-	dma_addr_t catbuf;
-
-	DPRINTK("preparing 1 page...\n");
-	DPRINTK("length=%d data=%p\n", skb->len, skb->data);
-	DPRINTK("unaligned_len=%d\n", unaligned_len);
-	DPRINTK("buffer_data=%p buffer_len=%d\n",
-	       buffer_data,
-	       buffer_len);
-
-	desc->header.raw=METH_TX_CMD_INT_EN|TX_CATBUF1|(skb->len-1);
-
-	/* unaligned part */
-	if(unaligned_len){
-		memcpy(desc->data.dt+(120-unaligned_len),
-		       skb->data, unaligned_len);
-		desc->header.raw |= (128-unaligned_len) << 16;
-	}
-
-	/* first page */
-	catbuf = pci_map_single(NULL,
-				buffer_data,
-				buffer_len,
-				PCI_DMA_TODEVICE);
-	DPRINTK("catbuf=%x\n", catbuf);
-	desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
-	desc->data.cat_buf[0].form.len = buffer_len-1;
-	DPRINTK("desc=%016lx\n",desc->header.raw);
-	DPRINTK("cat_buf[0].raw=%016lx\n",desc->data.cat_buf[0].raw);
-}
-#define TX_CATBUF2 BIT(26)
-static void meth_tx_2page_prepare(meth_private* priv, struct sk_buff* skb)
-{
-	tx_packet *desc=&priv->tx_ring[priv->tx_write];
-	void *buffer1_data = (void *)(((u64)skb->data + 7ULL) & (~7ULL));
-	void *buffer2_data = (void *)PAGE_ALIGN((u64)skb->data);
-	int unaligned_len = (int)((u64)buffer1_data - (u64)skb->data);
-	int buffer1_len = (int)((u64)buffer2_data - (u64)buffer1_data);
-	int buffer2_len = skb->len - buffer1_len - unaligned_len;
-	dma_addr_t catbuf1, catbuf2;
-
-	DPRINTK("preparing 2 pages... \n");
-	DPRINTK("length=%d data=%p\n", skb->len, skb->data);
-	DPRINTK("unaligned_len=%d\n", unaligned_len);
-	DPRINTK("buffer1_data=%p buffer1_len=%d\n",
-	       buffer1_data,
-	       buffer1_len);
-	DPRINTK("buffer2_data=%p buffer2_len=%d\n",
-	       buffer2_data,
-	       buffer2_len);
-
-	desc->header.raw=METH_TX_CMD_INT_EN|TX_CATBUF1|TX_CATBUF2|(skb->len-1);
-	/* unaligned part */
-	if(unaligned_len){
-		memcpy(desc->data.dt+(120-unaligned_len),
-		       skb->data, unaligned_len);
-		desc->header.raw |= (128-unaligned_len) << 16;
-	}
-
-	/* first page */
-	catbuf1 = pci_map_single(NULL,
-				 buffer1_data,
-				 buffer1_len,
-				 PCI_DMA_TODEVICE);
-	DPRINTK("catbuf1=%x\n", catbuf1);
-	desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
-	desc->data.cat_buf[0].form.len = buffer1_len-1;
-	/* second page */
-	catbuf2 = pci_map_single(NULL,
-				 buffer2_data,
-				 buffer2_len,
-				 PCI_DMA_TODEVICE);
-	DPRINTK("catbuf2=%x\n", catbuf2);
-	desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
-	desc->data.cat_buf[1].form.len = buffer2_len-1;
-	DPRINTK("desc=%016lx\n",desc->header.raw);
-	DPRINTK("cat_buf[0].raw=%016lx\n",desc->data.cat_buf[0].raw);
-	DPRINTK("cat_buf[1].raw=%016lx\n",desc->data.cat_buf[1].raw);
-}
-
-
-void meth_add_to_tx_ring(meth_private *priv, struct sk_buff* skb)
-{
-	DPRINTK("Transmitting data...\n");
-	if(skb->len <= 120) {
-		/* Whole packet fits into descriptor */
-		meth_tx_short_prepare(priv,skb);
-	} else if(PAGE_ALIGN((u64)skb->data) !=
-		  PAGE_ALIGN((u64)skb->data+skb->len-1)) {
-		/* Packet crosses page boundary */
-		meth_tx_2page_prepare(priv,skb);
-	} else {
-		/* Packet is in one page */
-		meth_tx_1page_prepare(priv,skb);
-	}
-
-	/* Remember the skb, so we can free it at interrupt time */
-	priv->tx_skbs[priv->tx_write] = skb;
-	priv->tx_write = (priv->tx_write+1) & (TX_RING_ENTRIES-1);
-	priv->regs->tx_info.wptr = priv->tx_write;
-	priv->tx_count ++;
-	/* Enable DMA transfer */
-	priv->regs->dma_ctrl |= METH_DMA_TX_INT_EN;
-}
-
-/*
- * Transmit a packet (called by the kernel)
- */
-int meth_tx(struct sk_buff *skb, struct net_device *dev)
-{
-	struct meth_private *priv = (struct meth_private *) dev->priv;
-
-	spin_lock_irq(&priv->meth_lock);
-
-	meth_add_to_tx_ring(priv, skb);
-	dev->trans_start = jiffies; /* save the timestamp */
-
-	/* If TX ring is full, tell the upper layer to stop sending packets */
-	if (meth_tx_full(dev)) {
-	        DPRINTK("TX full: stopping\n");
-		netif_stop_queue(dev);
-	}
-
-	spin_unlock_irq(&priv->meth_lock);
-
-	return 0;
-}
-
-/*
- * Deal with a transmit timeout.
- */
-
-void meth_tx_timeout (struct net_device *dev)
-{
-	struct meth_private *priv = (struct meth_private *) dev->priv;
-	
-	printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
-
-	/* Protect against concurrent rx interrupts */
-	spin_lock_irq(&priv->meth_lock);
-
-	/* Try to reset the adaptor. */
-	meth_reset(dev);
-
-	priv->stats.tx_errors++;
-
-	/* Clear all rings */
-	meth_free_tx_ring(priv);
-	meth_free_rx_ring(priv);
-	meth_init_tx_ring(priv);
-	meth_init_rx_ring(priv);
-
-	/* Restart dma */
-	priv->regs->dma_ctrl|=METH_DMA_TX_EN|METH_DMA_RX_EN|METH_DMA_RX_INT_EN;
-
-	/* Enable interrupt */
-	spin_unlock_irq(&priv->meth_lock);
-
-	dev->trans_start = jiffies;
-	netif_wake_queue(dev);
-
-	return;
-}
-
-/*
- * Ioctl commands 
- */
-int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- 
-    DPRINTK("ioctl\n");
-    return 0;
-}
-
-/*
- * Return statistics to the caller
- */
-struct net_device_stats *meth_stats(struct net_device *dev)
-{
-    struct meth_private *priv = (struct meth_private *) dev->priv;
-    return &priv->stats;
-}
-
-/*
- * The init function (sometimes called probe).
- * It is invoked by register_netdev()
- */
-int meth_init(struct net_device *dev)
-{
-	meth_private *priv;
-	int ret;
-	/* 
-	 * Then, assign other fields in dev, using ether_setup() and some
-	 * hand assignments
-	 */
-	ether_setup(dev); /* assign some of the fields */
-
-	dev->open            = meth_open;
-	dev->stop            = meth_release;
-	dev->set_config      = meth_config;
-	dev->hard_start_xmit = meth_tx;
-	dev->do_ioctl        = meth_ioctl;
-	dev->get_stats       = meth_stats;
-#ifdef HAVE_TX_TIMEOUT
-	dev->tx_timeout      = meth_tx_timeout;
-	dev->watchdog_timeo  = timeout;
-#endif
-	dev->irq		 = MACE_ETHERNET_IRQ;
-	SET_MODULE_OWNER(dev);
-
-	/*
-	 * Then, allocate the priv field. This encloses the statistics
-	 * and a few private fields.
-	 */
-	priv = kmalloc(sizeof(struct meth_private), GFP_KERNEL);
-	if (priv == NULL)
-		return -ENOMEM;
-	dev->priv=priv;
-	memset(priv, 0, sizeof(struct meth_private));
-	spin_lock_init(&((struct meth_private *) dev->priv)->meth_lock);
-	/*
-	 * Make the usual checks: check_region(), probe irq, ...  -ENODEV
-	 * should be returned if no device found.  No resource should be
-	 * grabbed: this is done on open(). 
-	 */
-	priv->regs=(meth_regs*)SGI_MFE;
-	dev->base_addr=SGI_MFE;
-	priv->phy_addr = -1; /* No phy is known yet... */
-
-	/* Initialize the hardware */
-	if((ret=meth_reset(dev)) < 0)
-	        return ret;
-
-	/* Allocate the ring buffers */
-	if((ret=meth_init_tx_ring(priv))<0||(ret=meth_init_rx_ring(priv))<0){
-		meth_free_tx_ring(priv);
-		meth_free_rx_ring(priv);
-		return ret;
-	}
-
-	printk("SGI O2 Fast Ethernet rev. %ld\n", priv->regs->mac_ctrl >> 29);
-
-    return 0;
-}
-
-/*
- * The devices
- */
-
-struct net_device meth_devs[1] = {
-    { init: meth_init, }  /* init, nothing more */
-};
-
-/*
- * Finally, the module stuff
- */
-
-int meth_init_module(void)
-{
-	int result, device_present = 0;
-
-	strcpy(meth_devs[0].name, "eth%d");
-
-	if ( (result = register_netdev(meth_devs)) )
-		printk("meth: error %i registering device \"%s\"\n",
-		       result, meth_devs->name);
-	else device_present++;
-#ifndef METH_DEBUG
-	EXPORT_NO_SYMBOLS;
-#endif
-	
-	return device_present ? 0 : -ENODEV;
-}
-
-void meth_cleanup(void)
-{
-    kfree(meth_devs->priv);
-    unregister_netdev(meth_devs);
-    return;
-}
-
-module_init(meth_init_module);
-module_exit(meth_cleanup);
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)