via-rhine.c

Linux下各种网卡的驱动程序

#else
				memcpy(skb_put(skb, pkt_len), np->rx_skbuff[entry]->tail,
					   pkt_len);
#endif
			} else {
				skb_put(skb = np->rx_skbuff[entry], pkt_len);
				np->rx_skbuff[entry] = NULL;
			}
			skb->protocol = eth_type_trans(skb, dev);
			{					/* Use hardware checksum info. */
				int rxtype = le32_to_cpu(desc->desc_length);
				int csum_bits = rxtype & RxTypeCsumMask;
				if (csum_bits == RxTypeUDPSumOK ||
					csum_bits == RxTypeTCPSumOK)
					skb->ip_summed = CHECKSUM_UNNECESSARY;
			}
			netif_rx(skb);
			dev->last_rx = jiffies;
#if defined(NETSTATS_VER2)
			np->stats.rx_bytes += pkt_len;
#endif
			np->stats.rx_packets++;
		}
		entry = (++np->cur_rx) % RX_RING_SIZE;
		np->rx_head_desc = &np->rx_ring[entry];
	}

	/* 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. */
			np->rx_ring[entry].addr = virt_to_le32desc(skb->tail);
		}
		np->rx_ring[entry].rx_status = cpu_to_le32(DescOwn);
	}

	/* Pre-emptively restart Rx engine. */
	writew(CmdRxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
	return 0;
}

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

	if (intr_status & (IntrMIIChange | IntrLinkChange)) {
		if (readb(ioaddr + MIIStatus) & 0x02) {
			/* Link failed, restart autonegotiation. */
			if (np->drv_flags & HasDavicomPhy)
				mdio_write(dev, np->phys[0], 0, 0x3300);
			netif_link_down(dev);
		} else {
			netif_link_up(dev);
			check_duplex(dev);
		}
		if (np->msg_level & NETIF_MSG_LINK)
			printk(KERN_ERR "%s: MII status 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 (intr_status & IntrStatsMax) {
		np->stats.rx_crc_errors	+= readw(ioaddr + RxCRCErrs);
		np->stats.rx_missed_errors	+= readw(ioaddr + RxMissed);
		writel(0, ioaddr + RxMissed);
	}
	if (intr_status & IntrTxAbort) {
		/* Stats counted in Tx-done handler, just restart Tx. */
		writel(virt_to_bus(&np->tx_ring[np->dirty_tx % TX_RING_SIZE]),
			   ioaddr + TxRingPtr);
		writew(CmdTxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
	}
	if (intr_status & IntrTxUnderrun) {
		if (np->tx_thresh < 0xE0)
			writeb(np->tx_thresh += 0x20, ioaddr + TxConfig);
		if (np->msg_level & NETIF_MSG_TX_ERR)
			printk(KERN_INFO "%s: Transmitter underrun, increasing Tx "
				   "threshold setting to %2.2x.\n", dev->name, np->tx_thresh);
	}
	if ((intr_status & ~(IntrLinkChange | IntrMIIChange | IntrStatsMax |
						 IntrTxAbort|IntrTxAborted | IntrNormalSummary))
		 && (np->msg_level & NETIF_MSG_DRV)) {
		printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
			   dev->name, intr_status);
		/* Recovery for other fault sources not known. */
		writew(CmdTxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
	}
}

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

	/* Nominally we should lock this segment of code for SMP, although
	   the vulnerability window is very small and statistics are
	   non-critical. */
	np->stats.rx_crc_errors	+= readw(ioaddr + RxCRCErrs);
	np->stats.rx_missed_errors	+= readw(ioaddr + RxMissed);
	writel(0, ioaddr + RxMissed);

	return &np->stats;
}

/* The big-endian AUTODIN II ethernet CRC calculation.
   N.B. Do not use for bulk data, use a table-based routine instead.
   This is common code and should be moved to net/core/crc.c */
static unsigned const ethernet_polynomial = 0x04c11db7U;
static inline u32 ether_crc(int length, unsigned char *data)
{
	int crc = -1;

	while(--length >= 0) {
		unsigned char current_octet = *data++;
		int bit;
		for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
			crc = (crc << 1) ^
				((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
		}
	}
	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;
	u32 mc_filter[2];			/* Multicast hash filter */
	u8 rx_mode;					/* Note: 0x02=accept runt, 0x01=accept errs */

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		/* Unconditionally log net taps. */
		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
		rx_mode = 0x1C;
	} else if ((dev->mc_count > np->multicast_filter_limit)
			   ||  (dev->flags & IFF_ALLMULTI)) {
		/* Too many to match, or accept all multicasts. */
		writel(0xffffffff, ioaddr + MulticastFilter0);
		writel(0xffffffff, ioaddr + MulticastFilter1);
		rx_mode = 0x0C;
	} else {
		struct dev_mc_list *mclist;
		int i;
		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(ETH_ALEN, mclist->dmi_addr) >> 26,
					mc_filter);
		}
		writel(mc_filter[0], ioaddr + MulticastFilter0);
		writel(mc_filter[1], ioaddr + MulticastFilter1);
		rx_mode = 0x0C;
	}
	writeb(np->rx_thresh | rx_mode, ioaddr + RxConfig);
}

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;
		/* Note: forced media tracking is done in mdio_write(). */
		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 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 %4.4x.\n",
			   dev->name, readw(ioaddr + ChipCmd));

	/* Switch to loopback mode to avoid hardware races. */
	writeb(np->tx_thresh | 0x01, ioaddr + TxConfig);

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

	/* Stop the chip's Tx and Rx processes. */
	np->chip_cmd = CmdStop;
	writew(CmdStop, ioaddr + ChipCmd);

	del_timer(&np->timer);

	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].rx_status = 0;
		np->rx_ring[i].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;
		if (np->tx_buf[i]) {
			kfree(np->tx_buf[i]);
			np->tx_buf[i] = 0;
		}
	}

	MOD_DEC_USE_COUNT;

	return 0;
}

static int via_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);
		/* Stop the chip's Tx and Rx processes. */
		writew(CmdStop, ioaddr + ChipCmd);
		break;
	case DRV_RESUME:
		/* This is incomplete: the actions are very chip specific. */
		set_rx_mode(dev);
		netif_start_tx_queue(dev);
		writew(np->chip_cmd, ioaddr + ChipCmd);
		writew(np->intr_enable, ioaddr + IntrEnable);
		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_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;
	}
	}

	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(&via_rhine_drv_id, NULL);
}

void cleanup_module(void)
{
	struct net_device *next_dev;

	pci_drv_unregister(&via_rhine_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_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` via-rhine.o"
 *  compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c via-rhine.c"
 *  simple-compile-command: "gcc -DMODULE -O6 -c via-rhine.c"
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 * End:
 */