meth.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:23k
- /*
- * 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:%02xn",
- (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 %0lxn",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 %in",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 %in",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 kindn");
- /* 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 QS6612Xn");
- break;
- case PHY_ICS1889:
- DPRINTK("PHY is ICS1889n");
- break;
- case PHY_ICS1890:
- DPRINTK("PHY is ICS1890n");
- break;
- case PHY_DP83840:
- DPRINTK("PHY is DP83840n");
- break;
- }
- #endif
- if(p2!=0xffff&&p2!=0x0000){
- DPRINTK("PHY code: %xn",(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-duplexn", 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 moden", 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 ringn");
- 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 initn");
- return 0;
- }
- static int meth_init_rx_ring(meth_private *priv)
- {
- int i;
- DPRINTK("Initializing RX ringn");
- for(i=0;i<RX_RING_ENTRIES;i++){
- DPRINTK("t1:t%it",i);
- /*if(!(priv->rx_ring[i]=get_free_page(GFP_KERNEL)))
- return -ENOMEM;
- DPRINTK("t2:t%in",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%pn",priv->rx_ring[i]);
- priv->regs->rx_fifo=priv->rx_ring_dmas[i];
- }
- priv->rx_write = 0;
- DPRINTK("Done with RX ringn");
- 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: %016lxn", 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 PHYn");
- 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 %dn", dev->name, dev->irq);
- return -EAGAIN;
- }
- netif_start_queue(dev);
- DPRINTK("Opened... DMA control=0x%08lxn", 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 addressn");
- return -EOPNOTSUPP;
- }
- /* Allow changing the IRQ */
- if (map->irq != dev->irq) {
- printk(KERN_WARNING "meth: Can't change IRQn");
- return -EOPNOTSUPP;
- }
- DPRINTK("Configuredn");
- /* 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 packetn");
- DPRINTK("len = %d rxb->status = %xn",
- 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 failuren");
- if (status.parsed.int_mask & (METH_INT_MEM_ERROR))
- printk(KERN_WARNING "meth: memory errorn");
- if (status.parsed.int_mask & (METH_INT_TX_ABORT))
- printk(KERN_WARNING "meth: abortedn");
- 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 packetn");
- /* 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=%016lxn",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=%pn", skb->len, skb->data);
- DPRINTK("unaligned_len=%dn", unaligned_len);
- DPRINTK("buffer_data=%p buffer_len=%dn",
- 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=%xn", catbuf);
- desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
- desc->data.cat_buf[0].form.len = buffer_len-1;
- DPRINTK("desc=%016lxn",desc->header.raw);
- DPRINTK("cat_buf[0].raw=%016lxn",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=%pn", skb->len, skb->data);
- DPRINTK("unaligned_len=%dn", unaligned_len);
- DPRINTK("buffer1_data=%p buffer1_len=%dn",
- buffer1_data,
- buffer1_len);
- DPRINTK("buffer2_data=%p buffer2_len=%dn",
- 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=%xn", 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=%xn", catbuf2);
- desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
- desc->data.cat_buf[1].form.len = buffer2_len-1;
- DPRINTK("desc=%016lxn",desc->header.raw);
- DPRINTK("cat_buf[0].raw=%016lxn",desc->data.cat_buf[0].raw);
- DPRINTK("cat_buf[1].raw=%016lxn",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: stoppingn");
- 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 outn", 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("ioctln");
- 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. %ldn", 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);