rtl8129.c

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					netif_wake_queue(dev);
				}
				dirty_tx++;
			}

#ifndef final_version
			if (tp->cur_tx - dirty_tx > NUM_TX_DESC) {
				printk(KERN_ERR"%s: Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
					   dev->name, dirty_tx, tp->cur_tx, tp->tx_full);
				dirty_tx += NUM_TX_DESC;
			}
#endif
			tp->dirty_tx = dirty_tx;
		}

		/* Check uncommon events with one test. */
		if (status & (PCIErr|PCSTimeout |RxUnderrun|RxOverflow|RxFIFOOver
					  |TxErr|RxErr)) {
			if (rtl8129_debug > 2)
				printk(KERN_NOTICE"%s: Abnormal interrupt, status %8.8x.\n",
					   dev->name, status);

			if (status == 0xffffffff)
				break;
			/* Update the error count. */
			tp->stats.rx_missed_errors += inl(ioaddr + RxMissed);
			outl(0, ioaddr + RxMissed);

			if ((status & RxUnderrun)  &&  link_changed  &&
				(rtl_cap_tbl[tp->chip_id] & HAS_LNK_CHNG)) {
				/* Really link-change on new chips. */
				int lpar = inw(ioaddr + NWayLPAR);
				int duplex = (lpar&0x0100)||(lpar & 0x01C0) == 0x0040; 
				if (tp->full_duplex != duplex) {
					tp->full_duplex = duplex;
					outb(0xC0, ioaddr + Cfg9346);
					outb(tp->full_duplex ? 0x60 : 0x20, ioaddr + Config1);
					outb(0x00, ioaddr + Cfg9346);
				}
				status &= ~RxUnderrun;
			}
			if (status & (RxUnderrun | RxOverflow | RxErr | RxFIFOOver))
				tp->stats.rx_errors++;

			if (status & (PCSTimeout)) tp->stats.rx_length_errors++;
			if (status & (RxUnderrun|RxFIFOOver)) tp->stats.rx_fifo_errors++;
			if (status & RxOverflow) {
				tp->stats.rx_over_errors++;
				tp->cur_rx = inw(ioaddr + RxBufAddr) % RX_BUF_LEN;
				outw(tp->cur_rx - 16, ioaddr + RxBufPtr);
			}
			if (status & PCIErr) {
				u32 pci_cmd_status;
				pcibios_read_config_dword(tp->pci_bus, tp->pci_devfn,
										  PCI_COMMAND, &pci_cmd_status);

				printk(KERN_ERR "%s: PCI Bus error %4.4x.\n",
					   dev->name, pci_cmd_status);
			}
		}
		if (--boguscnt < 0) {
			printk(KERN_WARNING"%s: Too much work at interrupt, "
				   "IntrStatus=0x%4.4x.\n",
				   dev->name, status);
			/* Clear all interrupt sources. */
			outw(0xffff, ioaddr + IntrStatus);
			break;
		}
	} while (1);

	if (rtl8129_debug > 3)
		printk(KERN_DEBUG"%s: exiting interrupt, intr_status=%#4.4x.\n",
			   dev->name, inl(ioaddr + IntrStatus));
	return;
}

/* The data sheet doesn't describe the Rx ring at all, so I'm guessing at the
   field alignments and semantics. */
static int rtl8129_rx(struct net_device *dev)
{
	struct rtl8129_private *tp = (struct rtl8129_private *)dev->priv;
	long ioaddr = dev->base_addr;
	unsigned char *rx_ring = tp->rx_ring;
	u16 cur_rx = tp->cur_rx;

	if (rtl8129_debug > 4)
		printk(KERN_DEBUG"%s: In rtl8129_rx(), current %4.4x BufAddr %4.4x,"
			   " free to %4.4x, Cmd %2.2x.\n",
			   dev->name, cur_rx, inw(ioaddr + RxBufAddr),
			   inw(ioaddr + RxBufPtr), inb(ioaddr + ChipCmd));

	while ((inb(ioaddr + ChipCmd) & 1) == 0) {
		int ring_offset = cur_rx % RX_BUF_LEN;
		u32 rx_status = le32_to_cpu(*(u32*)(rx_ring + ring_offset));
		int rx_size = rx_status >> 16;

		if (rtl8129_debug > 4) {
			int i;
			printk(KERN_DEBUG"%s:  rtl8129_rx() status %4.4x, size %4.4x, cur %4.4x.\n",
				   dev->name, rx_status, rx_size, cur_rx);
			printk(KERN_DEBUG"%s: Frame contents ", dev->name);
			for (i = 0; i < 70; i++)
				printk(" %2.2x", le32_to_cpu(rx_ring[ring_offset + i]));
			printk(".\n");
		}
		if (rx_status & RxTooLong) {
			if (rtl8129_debug > 0)
				printk(KERN_NOTICE"%s: Oversized Ethernet frame, status %4.4x!\n",
					   dev->name, rx_status);
			tp->stats.rx_length_errors++;
		} else if (rx_status &
				   (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) {
			if (rtl8129_debug > 1)
				printk(KERN_DEBUG"%s: Ethernet frame had errors,"
					   " status %4.4x.\n", dev->name, rx_status);
			tp->stats.rx_errors++;
			if (rx_status & (RxBadSymbol|RxBadAlign))
				tp->stats.rx_frame_errors++;
			if (rx_status & (RxRunt|RxTooLong)) tp->stats.rx_length_errors++;
			if (rx_status & RxCRCErr) tp->stats.rx_crc_errors++;
			/* Reset the receiver, based on RealTek recommendation. (Bug?) */
			tp->cur_rx = 0;
			outb(CmdTxEnb, ioaddr + ChipCmd);
			outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
			outl((RX_FIFO_THRESH << 13) | (RX_BUF_LEN_IDX << 11) |
				 (RX_DMA_BURST<<8), ioaddr + RxConfig);
		} else {
			/* Malloc up new buffer, compatible with net-2e. */
			/* Omit the four octet CRC from the length. */
			struct sk_buff *skb;
			int pkt_size = rx_size - 4;

			skb = dev_alloc_skb(pkt_size + 2);
			if (skb == NULL) {
				printk(KERN_WARNING"%s: Memory squeeze, deferring packet.\n",
					   dev->name);
				/* We should check that some rx space is free.
				   If not, free one and mark stats->rx_dropped++. */
				tp->stats.rx_dropped++;
				break;
			}
			skb->dev = dev;
			skb_reserve(skb, 2);	/* 16 byte align the IP fields. */
			if (ring_offset+rx_size > RX_BUF_LEN) {
				int semi_count = RX_BUF_LEN - ring_offset - 4;
				memcpy(skb_put(skb, semi_count), &rx_ring[ring_offset + 4],
					   semi_count);
				memcpy(skb_put(skb, pkt_size-semi_count), rx_ring,
					   pkt_size-semi_count);
				if (rtl8129_debug > 4) {
					int i;
					printk(KERN_DEBUG"%s:  Frame wrap @%d",
						   dev->name, semi_count);
					for (i = 0; i < 16; i++)
						printk(" %2.2x", le32_to_cpu(rx_ring[i]));
					printk(".\n");
					memset(rx_ring, 0xcc, 16);
				}
			} else {
#if 1  /* USE_IP_COPYSUM */
				eth_copy_and_sum(skb, &rx_ring[ring_offset + 4],
								 pkt_size, 0);
				skb_put(skb, pkt_size);
#else
				memcpy(skb_put(skb, pkt_size), &rx_ring[ring_offset + 4],
					   pkt_size);
#endif
			}
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
#if LINUX_VERSION_CODE > 0x20119
			tp->stats.rx_bytes += pkt_size;
#endif
			tp->stats.rx_packets++;
		}

		cur_rx = (cur_rx + rx_size + 4 + 3) & ~3;
		outw(cur_rx - 16, ioaddr + RxBufPtr);
	}
	if (rtl8129_debug > 4)
		printk(KERN_DEBUG"%s: Done rtl8129_rx(), current %4.4x BufAddr %4.4x,"
			   " free to %4.4x, Cmd %2.2x.\n",
			   dev->name, cur_rx, inw(ioaddr + RxBufAddr),
			   inw(ioaddr + RxBufPtr), inb(ioaddr + ChipCmd));
	tp->cur_rx = cur_rx;
	return 0;
}

static int
rtl8129_close(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	struct rtl8129_private *tp = (struct rtl8129_private *)dev->priv;
	int i;

	netif_stop_queue(dev);

	del_timer_sync(&tp->timer);

	if (rtl8129_debug > 1)
		printk(KERN_DEBUG"%s: Shutting down ethercard, status was 0x%4.4x.\n",
			   dev->name, inw(ioaddr + IntrStatus));

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

	/* Stop the chip's Tx and Rx DMA processes. */
	outb(0x00, ioaddr + ChipCmd);

	/* Update the error counts. */
	tp->stats.rx_missed_errors += inl(ioaddr + RxMissed);
	outl(0, ioaddr + RxMissed);

	free_irq(dev->irq, dev);

	for (i = 0; i < NUM_TX_DESC; i++) {
		struct sk_buff *skb = tp->tx_info[i].skb;
		dma_addr_t mapping = tp->tx_info[i].mapping;

		if (skb) {
			if (mapping)
				pci_unmap_single(tp->pdev, mapping, skb->len, PCI_DMA_TODEVICE);
			dev_kfree_skb(skb);
		}
		tp->tx_info[i].skb = NULL;
		tp->tx_info[i].mapping = 0;
	}
	pci_free_consistent(tp->pdev, RX_BUF_LEN + 16,
						tp->rx_ring, tp->rx_ring_dma);
	pci_free_consistent(tp->pdev, TX_BUF_SIZE * NUM_TX_DESC,
						tp->tx_bufs, tp->tx_bufs_dma);
	tp->rx_ring = NULL;
	tp->tx_bufs = NULL;

	/* Green! Put the chip in low-power mode. */
	outb(0xC0, ioaddr + Cfg9346);
	outb(0x03, ioaddr + Config1);
	outb('H', ioaddr + HltClk);		/* 'R' would leave the clock running. */

	MOD_DEC_USE_COUNT;

	return 0;
}

static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct rtl8129_private *tp = (struct rtl8129_private *)dev->priv;
	u16 *data = (u16 *)&rq->ifr_data;

	switch(cmd) {
	case SIOCDEVPRIVATE:		/* Get the address of the PHY in use. */
		data[0] = tp->phys[0] & 0x3f;
		/* Fall Through */
	case SIOCDEVPRIVATE+1:		/* Read the specified MII register. */
		data[3] = mdio_read(dev, data[0], data[1] & 0x1f);
		return 0;
	case SIOCDEVPRIVATE+2:		/* Write the specified MII register */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		mdio_write(dev, data[0], data[1] & 0x1f, data[2]);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static struct net_device_stats *
rtl8129_get_stats(struct net_device *dev)
{
	struct rtl8129_private *tp = (struct rtl8129_private *)dev->priv;
	long ioaddr = dev->base_addr;

	if (netif_running(dev)) {
		tp->stats.rx_missed_errors += inl(ioaddr + RxMissed);
		outl(0, ioaddr + RxMissed);
	}

	return &tp->stats;
}

/* Set or clear the multicast filter for this adaptor.
   This routine is not state sensitive and need not be SMP locked. */

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;
}

/* Bits in RxConfig. */
enum rx_mode_bits {
	AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08,
	AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01,
};

static void set_rx_mode(struct net_device *dev)
{
	long ioaddr = dev->base_addr;
	u32 mc_filter[2];		 /* Multicast hash filter */
	int i, rx_mode;

	if (rtl8129_debug > 3)
		printk(KERN_DEBUG"%s:   set_rx_mode(%4.4x) done -- Rx config %8.8x.\n",
			   dev->name, dev->flags, inl(ioaddr + RxConfig));

	/* 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 | AcceptMulticast | AcceptMyPhys;
		mc_filter[1] = mc_filter[0] = 0;
		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);
	}
	/* We can safely update without stopping the chip. */
	outb(rx_mode, ioaddr + RxConfig);
	outl(mc_filter[0], ioaddr + MAR0 + 0);
	outl(mc_filter[1], ioaddr + MAR0 + 4);
	return;
}


static void __exit rtl8129_cleanup (void)
{
	struct net_device *next_dev;

	/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
	while (root_rtl8129_dev) {
		struct rtl8129_private *tp =
			(struct rtl8129_private *)root_rtl8129_dev->priv;
		next_dev = tp->next_module;
		unregister_netdev(root_rtl8129_dev);
		release_region(root_rtl8129_dev->base_addr,
					   pci_tbl[tp->chip_id].io_size);
		kfree(tp);
		kfree(root_rtl8129_dev);
		root_rtl8129_dev = next_dev;
	}
}

module_init(rtl8129_probe);
module_exit(rtl8129_cleanup);

/*
 * Local variables:
 *  compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c rtl8129.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 * End:
 */