sundance.c

Linux下各种网卡的驱动程序

	/* Refill the Rx ring buffers. */
	for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
		struct sk_buff *skb;
		entry = np->dirty_rx % RX_RING_SIZE;
		if (np->rx_skbuff[entry] == NULL) {
			skb = dev_alloc_skb(np->rx_buf_sz);
			np->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 */
			np->rx_ring[entry].frag[0].addr = virt_to_le32desc(skb->tail);
		}
		/* Perhaps we need not reset this field. */
		np->rx_ring[entry].frag[0].length =
			cpu_to_le32(np->rx_buf_sz | LastFrag);
		np->rx_ring[entry].status = 0;
	}

	/* No need to restart Rx engine, it will poll. */
	return 0;
}

static void netdev_error(struct net_device *dev, int intr_status)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;

	if (intr_status & IntrDrvRqst) {
		/* Stop the down counter and turn interrupts back on. */
		printk(KERN_WARNING "%s: Turning interrupts back on.\n", dev->name);
		writew(0, ioaddr + DownCounter);
		writew(IntrRxDMADone | IntrPCIErr | IntrDrvRqst |
			   IntrTxDone | StatsMax | LinkChange, ioaddr + IntrEnable);
	}
	if (intr_status & LinkChange) {
		int new_status = readb(ioaddr + MIICtrl) & 0xE0;
		if (np->msg_level & NETIF_MSG_LINK)
			printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
				   " %4.4x  partner %4.4x.\n", dev->name,
				   mdio_read(dev, np->phys[0], 4),
				   mdio_read(dev, np->phys[0], 5));
		if ((np->link_status ^ new_status) & 0x80) {
			if (new_status & 0x80)
				netif_link_up(dev);
			else
				netif_link_down(dev);
		}
		np->link_status = new_status;
		check_duplex(dev);
	}
	if (intr_status & StatsMax) {
		get_stats(dev);
	}
	if (intr_status & IntrPCIErr) {
		printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
			   dev->name, intr_status);
		/* We must do a global reset of DMA to continue. */
	}
}

static struct net_device_stats *get_stats(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	int i;

	if (readw(ioaddr + StationAddr) == 0xffff)
		return &np->stats;

	/* We do not spinlock statistics.
	   A window only exists if we have non-atomic adds, the error counts
	   are typically zero, and statistics are non-critical. */ 
	np->stats.rx_missed_errors	+= readb(ioaddr + RxMissed);
	np->stats.tx_packets += readw(ioaddr + TxFramesOK);
	np->stats.rx_packets += readw(ioaddr + RxFramesOK);
	np->stats.collisions += readb(ioaddr + StatsLateColl);
	np->stats.collisions += readb(ioaddr + StatsMultiColl);
	np->stats.collisions += readb(ioaddr + StatsOneColl);
	readb(ioaddr + StatsCarrierError);
	readb(ioaddr + StatsTxDefer);
	for (i = StatsTxXSDefer; i <= StatsMcastRx; i++)
		readb(ioaddr + i);
#if LINUX_VERSION_CODE > 0x20127
	np->stats.tx_bytes += readw(ioaddr + TxOctetsLow);
	np->stats.tx_bytes += readw(ioaddr + TxOctetsHigh) << 16;
	np->stats.rx_bytes += readw(ioaddr + RxOctetsLow);
	np->stats.rx_bytes += readw(ioaddr + RxOctetsHigh) << 16;
#else
	readw(ioaddr + TxOctetsLow);
	readw(ioaddr + TxOctetsHigh);
	readw(ioaddr + RxOctetsLow);
	readw(ioaddr + RxOctetsHigh);
#endif

	return &np->stats;
}

/* The little-endian AUTODIN II ethernet CRC calculations.
   A big-endian version is also available.
   This is slow but compact code.  Do not use this routine for bulk data,
   use a table-based routine instead.
   This is common code and should be moved to net/core/crc.c.
   Chips may use the upper or lower CRC bits, and may reverse and/or invert
   them.  Select the endian-ness that results in minimal calculations.
*/
static unsigned const ethernet_polynomial_le = 0xedb88320U;
static inline unsigned ether_crc_le(int length, unsigned char *data)
{
	unsigned int crc = ~0;	/* Initial value. */
	while(--length >= 0) {
		unsigned char current_octet = *data++;
		int bit;
		for (bit = 8; --bit >= 0; current_octet >>= 1) {
			if ((crc ^ current_octet) & 1) {
				crc >>= 1;
				crc ^= ethernet_polynomial_le;
			} else
				crc >>= 1;
		}
	}
	return crc;
}

static void set_rx_mode(struct net_device *dev)
{
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	long ioaddr = dev->base_addr;
	u16 mc_filter[4];			/* Multicast hash filter */
	u32 rx_mode;
	int i;

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		/* Unconditionally log net taps. */
		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
		memset(mc_filter, ~0, sizeof(mc_filter));
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptAll | AcceptMyPhys;
	} else if ((dev->mc_count > np->multicast_filter_limit)
			   ||  (dev->flags & IFF_ALLMULTI)) {
		/* Too many to match, or accept all multicasts. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
	} else if (dev->mc_count) {
		struct dev_mc_list *mclist;
		memset(mc_filter, 0, sizeof(mc_filter));
		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
			 i++, mclist = mclist->next) {
			set_bit(ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f,
					mc_filter);
		}
		rx_mode = AcceptBroadcast | AcceptMultiHash | AcceptMyPhys;
	} else {
		writeb(AcceptBroadcast | AcceptMyPhys, ioaddr + RxMode);
		return;
	}
	for (i = 0; i < 4; i++)
		writew(mc_filter[i], ioaddr + MulticastFilter0 + i*2);
	writeb(rx_mode, ioaddr + RxMode);
}

static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	u16 *data = (u16 *)&rq->ifr_data;
	u32 *data32 = (void *)&rq->ifr_data;

	switch(cmd) {
	case 0x8947: case 0x89F0:
		/* SIOCGMIIPHY: Get the address of the PHY in use. */
		data[0] = np->phys[0] & 0x1f;
		/* Fall Through */
	case 0x8948: case 0x89F1:
		/* SIOCGMIIREG: Read the specified MII register. */
		data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
		return 0;
	case 0x8949: case 0x89F2:
		/* SIOCSMIIREG: Write the specified MII register */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		if (data[0] == np->phys[0]) {
			u16 value = data[2];
			switch (data[1]) {
			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(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
		return 0;
	case SIOCGPARAMS:
		data32[0] = np->msg_level;
		data32[1] = np->multicast_filter_limit;
		data32[2] = np->max_interrupt_work;
		data32[3] = np->rx_copybreak;
		return 0;
	case SIOCSPARAMS:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		np->msg_level = data32[0];
		np->multicast_filter_limit = data32[1];
		np->max_interrupt_work = data32[2];
		np->rx_copybreak = data32[3];
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int sundance_pwr_event(void *dev_instance, int event)
{
	struct net_device *dev = dev_instance;
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	long ioaddr = dev->base_addr;

	if (np->msg_level & NETIF_MSG_LINK)
		printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
	switch(event) {
	case DRV_ATTACH:
		MOD_INC_USE_COUNT;
		break;
	case DRV_SUSPEND:
		/* Disable interrupts, stop Tx and Rx. */
		writew(0x0000, ioaddr + IntrEnable);
		writew(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);
		break;
	case DRV_RESUME:
		sundance_start(dev);
		break;
	case DRV_DETACH: {
		struct net_device **devp, **next;
		if (dev->flags & IFF_UP) {
			/* Some, but not all, kernel versions close automatically. */
			dev_close(dev);
			dev->flags &= ~(IFF_UP|IFF_RUNNING);
		}
		unregister_netdev(dev);
		release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
#ifndef USE_IO_OPS
		iounmap((char *)dev->base_addr);
#endif
		for (devp = &root_net_dev; *devp; devp = next) {
			next = &((struct netdev_private *)(*devp)->priv)->next_module;
			if (*devp == dev) {
				*devp = *next;
				break;
			}
		}
		if (np->priv_addr)
			kfree(np->priv_addr);
		kfree(dev);
		MOD_DEC_USE_COUNT;
		break;
	}
	case DRV_PWR_WakeOn:
		writeb(readb(ioaddr + WakeEvent) | 2, ioaddr + WakeEvent);
		/* Fall through. */
	case DRV_PWR_DOWN:
	case DRV_PWR_UP:
		acpi_set_pwr_state(np->pci_dev, event==DRV_PWR_UP ? ACPI_D0:ACPI_D3);
		break;
	default:
		return -1;
	}

	return 0;
}

static int netdev_close(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct netdev_private *np = (struct netdev_private *)dev->priv;
	int i;

	netif_stop_tx_queue(dev);

	if (np->msg_level & NETIF_MSG_IFDOWN) {
		printk(KERN_DEBUG "%s: Shutting down ethercard, status was Tx %2.2x "
			   "Rx %4.4x Int %2.2x.\n",
			   dev->name, (int)readw(ioaddr + TxStatus),
			   (int)readl(ioaddr + RxStatus), (int)readw(ioaddr + IntrStatus));
		printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
			   dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
	}

	/* Disable interrupts by clearing the interrupt mask. */
	writew(0x0000, ioaddr + IntrEnable);

	/* Stop the chip's Tx and Rx processes. */
	writew(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);

	del_timer(&np->timer);

#ifdef __i386__
	if (np->msg_level & NETIF_MSG_IFDOWN) {
		printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
			   (int)virt_to_bus(np->tx_ring));
		for (i = 0; i < TX_RING_SIZE; i++)
			printk(" #%d desc. %4.4x %8.8x %8.8x.\n",
				   i, np->tx_ring[i].status, np->tx_ring[i].frag[0].addr,
				   np->tx_ring[i].frag[0].length);
		printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
			   (int)virt_to_bus(np->rx_ring));
		for (i = 0; i < /*RX_RING_SIZE*/4 ; i++) {
			printk(KERN_DEBUG " #%d desc. %4.4x %4.4x %8.8x\n",
				   i, np->rx_ring[i].status, np->rx_ring[i].frag[0].addr,
				   np->rx_ring[i].frag[0].length);
		}
	}
#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++) {
		np->rx_ring[i].status = 0;
		np->rx_ring[i].frag[0].addr = 0xBADF00D0; /* An invalid address. */
		if (np->rx_skbuff[i]) {
#if LINUX_VERSION_CODE < 0x20100
			np->rx_skbuff[i]->free = 1;
#endif
			dev_free_skb(np->rx_skbuff[i]);
		}
		np->rx_skbuff[i] = 0;
	}
	for (i = 0; i < TX_RING_SIZE; i++) {
		if (np->tx_skbuff[i])
			dev_free_skb(np->tx_skbuff[i]);
		np->tx_skbuff[i] = 0;
	}

	MOD_DEC_USE_COUNT;

	return 0;
}


#ifdef MODULE
int init_module(void)
{
	if (debug >= NETIF_MSG_DRV)	/* Emit version even if no cards detected. */
		printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
	return pci_drv_register(&sundance_drv_id, NULL);
}

void cleanup_module(void)
{
	struct net_device *next_dev;

	pci_drv_unregister(&sundance_drv_id);

	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	while (root_net_dev) {
		struct netdev_private *np = (void *)(root_net_dev->priv);
		unregister_netdev(root_net_dev);
#ifdef USE_IO_OPS
		release_region(root_net_dev->base_addr,
					   pci_id_tbl[np->chip_id].io_size);
#else
		iounmap((char *)root_net_dev->base_addr);
#endif
		next_dev = np->next_module;
		if (np->priv_addr)
			kfree(np->priv_addr);
		kfree(root_net_dev);
		root_net_dev = next_dev;
	}
}

#endif  /* MODULE */

/*
 * Local variables:
 *  compile-command: "make KERNVER=`uname -r` sundance.o"
 *  compile-cmd1: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c sundance.c"
 *  simple-compile-command: "gcc -DMODULE -O6 -c sundance.c"
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 * End:
 */