Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1745 commits)
  dp83640: free packet queues on remove
  dp83640: use proper function to free transmit time stamping packets
  ipv6: Do not use routes from locally generated RAs
  |PATCH net-next] tg3: add tx_dropped counter
  be2net: don't create multiple RX/TX rings in multi channel mode
  be2net: don't create multiple TXQs in BE2
  be2net: refactor VF setup/teardown code into be_vf_setup/clear()
  be2net: add vlan/rx-mode/flow-control config to be_setup()
  net_sched: cls_flow: use skb_header_pointer()
  ipv4: avoid useless call of the function check_peer_pmtu
  TCP: remove TCP_DEBUG
  net: Fix driver name for mdio-gpio.c
  ipv4: tcp: fix TOS value in ACK messages sent from TIME_WAIT
  rtnetlink: Add missing manual netlink notification in dev_change_net_namespaces
  ipv4: fix ipsec forward performance regression
  jme: fix irq storm after suspend/resume
  route: fix ICMP redirect validation
  net: hold sock reference while processing tx timestamps
  tcp: md5: add more const attributes
  Add ethtool -g support to virtio_net
  ...

Fix up conflicts in:
 - drivers/net/Kconfig:
	The split-up generated a trivial conflict with removal of a
	stale reference to Documentation/networking/net-modules.txt.
	Remove it from the new location instead.
 - fs/sysfs/dir.c:
	Fairly nasty conflicts with the sysfs rb-tree usage, conflicting
	with Eric Biederman's changes for tagged directories.

1 files changed, 2603 insertions, 0 deletions

diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c
new file mode 100644
index 00000000000..6199f6b387b
--- /dev/null
+++ b/drivers/net/ethernet/toshiba/spider_net.c
@@ -0,0 +1,2603 @@
+/*
+ * Network device driver for Cell Processor-Based Blade and Celleb platform
+ *
+ * (C) Copyright IBM Corp. 2005
+ * (C) Copyright 2006 TOSHIBA CORPORATION
+ *
+ * Authors : Utz Bacher <utz.bacher@de.ibm.com>
+ *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/compiler.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/firmware.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/gfp.h>
+#include <linux/ioport.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/mii.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/bitops.h>
+#include <asm/pci-bridge.h>
+#include <net/checksum.h>
+
+#include "spider_net.h"
+
+MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
+	      "<Jens.Osterkamp@de.ibm.com>");
+MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(VERSION);
+MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
+
+static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
+static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
+
+module_param(rx_descriptors, int, 0444);
+module_param(tx_descriptors, int, 0444);
+
+MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
+		 "in rx chains");
+MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
+		 "in tx chain");
+
+char spider_net_driver_name[] = "spidernet";
+
+static DEFINE_PCI_DEVICE_TABLE(spider_net_pci_tbl) = {
+	{ PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
+
+/**
+ * spider_net_read_reg - reads an SMMIO register of a card
+ * @card: device structure
+ * @reg: register to read from
+ *
+ * returns the content of the specified SMMIO register.
+ */
+static inline u32
+spider_net_read_reg(struct spider_net_card *card, u32 reg)
+{
+	/* We use the powerpc specific variants instead of readl_be() because
+	 * we know spidernet is not a real PCI device and we can thus avoid the
+	 * performance hit caused by the PCI workarounds.
+	 */
+	return in_be32(card->regs + reg);
+}
+
+/**
+ * spider_net_write_reg - writes to an SMMIO register of a card
+ * @card: device structure
+ * @reg: register to write to
+ * @value: value to write into the specified SMMIO register
+ */
+static inline void
+spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
+{
+	/* We use the powerpc specific variants instead of writel_be() because
+	 * we know spidernet is not a real PCI device and we can thus avoid the
+	 * performance hit caused by the PCI workarounds.
+	 */
+	out_be32(card->regs + reg, value);
+}
+
+/** spider_net_write_phy - write to phy register
+ * @netdev: adapter to be written to
+ * @mii_id: id of MII
+ * @reg: PHY register
+ * @val: value to be written to phy register
+ *
+ * spider_net_write_phy_register writes to an arbitrary PHY
+ * register via the spider GPCWOPCMD register. We assume the queue does
+ * not run full (not more than 15 commands outstanding).
+ **/
+static void
+spider_net_write_phy(struct net_device *netdev, int mii_id,
+		     int reg, int val)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+	u32 writevalue;
+
+	writevalue = ((u32)mii_id << 21) |
+		((u32)reg << 16) | ((u32)val);
+
+	spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
+}
+
+/** spider_net_read_phy - read from phy register
+ * @netdev: network device to be read from
+ * @mii_id: id of MII
+ * @reg: PHY register
+ *
+ * Returns value read from PHY register
+ *
+ * spider_net_write_phy reads from an arbitrary PHY
+ * register via the spider GPCROPCMD register
+ **/
+static int
+spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+	u32 readvalue;
+
+	readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
+	spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
+
+	/* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
+	 * interrupt, as we poll for the completion of the read operation
+	 * in spider_net_read_phy. Should take about 50 us */
+	do {
+		readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
+	} while (readvalue & SPIDER_NET_GPREXEC);
+
+	readvalue &= SPIDER_NET_GPRDAT_MASK;
+
+	return readvalue;
+}
+
+/**
+ * spider_net_setup_aneg - initial auto-negotiation setup
+ * @card: device structure
+ **/
+static void
+spider_net_setup_aneg(struct spider_net_card *card)
+{
+	struct mii_phy *phy = &card->phy;
+	u32 advertise = 0;
+	u16 bmsr, estat;
+
+	bmsr  = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
+	estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
+
+	if (bmsr & BMSR_10HALF)
+		advertise |= ADVERTISED_10baseT_Half;
+	if (bmsr & BMSR_10FULL)
+		advertise |= ADVERTISED_10baseT_Full;
+	if (bmsr & BMSR_100HALF)
+		advertise |= ADVERTISED_100baseT_Half;
+	if (bmsr & BMSR_100FULL)
+		advertise |= ADVERTISED_100baseT_Full;
+
+	if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
+		advertise |= SUPPORTED_1000baseT_Full;
+	if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
+		advertise |= SUPPORTED_1000baseT_Half;
+
+	sungem_phy_probe(phy, phy->mii_id);
+	phy->def->ops->setup_aneg(phy, advertise);
+
+}
+
+/**
+ * spider_net_rx_irq_off - switch off rx irq on this spider card
+ * @card: device structure
+ *
+ * switches off rx irq by masking them out in the GHIINTnMSK register
+ */
+static void
+spider_net_rx_irq_off(struct spider_net_card *card)
+{
+	u32 regvalue;
+
+	regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
+}
+
+/**
+ * spider_net_rx_irq_on - switch on rx irq on this spider card
+ * @card: device structure
+ *
+ * switches on rx irq by enabling them in the GHIINTnMSK register
+ */
+static void
+spider_net_rx_irq_on(struct spider_net_card *card)
+{
+	u32 regvalue;
+
+	regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
+	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
+}
+
+/**
+ * spider_net_set_promisc - sets the unicast address or the promiscuous mode
+ * @card: card structure
+ *
+ * spider_net_set_promisc sets the unicast destination address filter and
+ * thus either allows for non-promisc mode or promisc mode
+ */
+static void
+spider_net_set_promisc(struct spider_net_card *card)
+{
+	u32 macu, macl;
+	struct net_device *netdev = card->netdev;
+
+	if (netdev->flags & IFF_PROMISC) {
+		/* clear destination entry 0 */
+		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
+		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
+		spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
+				     SPIDER_NET_PROMISC_VALUE);
+	} else {
+		macu = netdev->dev_addr[0];
+		macu <<= 8;
+		macu |= netdev->dev_addr[1];
+		memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
+
+		macu |= SPIDER_NET_UA_DESCR_VALUE;
+		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
+		spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
+		spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
+				     SPIDER_NET_NONPROMISC_VALUE);
+	}
+}
+
+/**
+ * spider_net_get_mac_address - read mac address from spider card
+ * @card: device structure
+ *
+ * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
+ */
+static int
+spider_net_get_mac_address(struct net_device *netdev)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+	u32 macl, macu;
+
+	macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
+	macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);
+
+	netdev->dev_addr[0] = (macu >> 24) & 0xff;
+	netdev->dev_addr[1] = (macu >> 16) & 0xff;
+	netdev->dev_addr[2] = (macu >> 8) & 0xff;
+	netdev->dev_addr[3] = macu & 0xff;
+	netdev->dev_addr[4] = (macl >> 8) & 0xff;
+	netdev->dev_addr[5] = macl & 0xff;
+
+	if (!is_valid_ether_addr(&netdev->dev_addr[0]))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * spider_net_get_descr_status -- returns the status of a descriptor
+ * @descr: descriptor to look at
+ *
+ * returns the status as in the dmac_cmd_status field of the descriptor
+ */
+static inline int
+spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
+{
+	return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
+}
+
+/**
+ * spider_net_free_chain - free descriptor chain
+ * @card: card structure
+ * @chain: address of chain
+ *
+ */
+static void
+spider_net_free_chain(struct spider_net_card *card,
+		      struct spider_net_descr_chain *chain)
+{
+	struct spider_net_descr *descr;
+
+	descr = chain->ring;
+	do {
+		descr->bus_addr = 0;
+		descr->hwdescr->next_descr_addr = 0;
+		descr = descr->next;
+	} while (descr != chain->ring);
+
+	dma_free_coherent(&card->pdev->dev, chain->num_desc,
+	    chain->hwring, chain->dma_addr);
+}
+
+/**
+ * spider_net_init_chain - alloc and link descriptor chain
+ * @card: card structure
+ * @chain: address of chain
+ *
+ * We manage a circular list that mirrors the hardware structure,
+ * except that the hardware uses bus addresses.
+ *
+ * Returns 0 on success, <0 on failure
+ */
+static int
+spider_net_init_chain(struct spider_net_card *card,
+		       struct spider_net_descr_chain *chain)
+{
+	int i;
+	struct spider_net_descr *descr;
+	struct spider_net_hw_descr *hwdescr;
+	dma_addr_t buf;
+	size_t alloc_size;
+
+	alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
+
+	chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
+		&chain->dma_addr, GFP_KERNEL);
+
+	if (!chain->hwring)
+		return -ENOMEM;
+
+	memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
+
+	/* Set up the hardware pointers in each descriptor */
+	descr = chain->ring;
+	hwdescr = chain->hwring;
+	buf = chain->dma_addr;
+	for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
+		hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
+		hwdescr->next_descr_addr = 0;
+
+		descr->hwdescr = hwdescr;
+		descr->bus_addr = buf;
+		descr->next = descr + 1;
+		descr->prev = descr - 1;
+
+		buf += sizeof(struct spider_net_hw_descr);
+	}
+	/* do actual circular list */
+	(descr-1)->next = chain->ring;
+	chain->ring->prev = descr-1;
+
+	spin_lock_init(&chain->lock);
+	chain->head = chain->ring;
+	chain->tail = chain->ring;
+	return 0;
+}
+
+/**
+ * spider_net_free_rx_chain_contents - frees descr contents in rx chain
+ * @card: card structure
+ *
+ * returns 0 on success, <0 on failure
+ */
+static void
+spider_net_free_rx_chain_contents(struct spider_net_card *card)
+{
+	struct spider_net_descr *descr;
+
+	descr = card->rx_chain.head;
+	do {
+		if (descr->skb) {
+			pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
+					 SPIDER_NET_MAX_FRAME,
+					 PCI_DMA_BIDIRECTIONAL);
+			dev_kfree_skb(descr->skb);
+			descr->skb = NULL;
+		}
+		descr = descr->next;
+	} while (descr != card->rx_chain.head);
+}
+
+/**
+ * spider_net_prepare_rx_descr - Reinitialize RX descriptor
+ * @card: card structure
+ * @descr: descriptor to re-init
+ *
+ * Return 0 on success, <0 on failure.
+ *
+ * Allocates a new rx skb, iommu-maps it and attaches it to the
+ * descriptor. Mark the descriptor as activated, ready-to-use.
+ */
+static int
+spider_net_prepare_rx_descr(struct spider_net_card *card,
+			    struct spider_net_descr *descr)
+{
+	struct spider_net_hw_descr *hwdescr = descr->hwdescr;
+	dma_addr_t buf;
+	int offset;
+	int bufsize;
+
+	/* we need to round up the buffer size to a multiple of 128 */
+	bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
+		(~(SPIDER_NET_RXBUF_ALIGN - 1));
+
+	/* and we need to have it 128 byte aligned, therefore we allocate a
+	 * bit more */
+	/* allocate an skb */
+	descr->skb = netdev_alloc_skb(card->netdev,
+				      bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
+	if (!descr->skb) {
+		if (netif_msg_rx_err(card) && net_ratelimit())
+			dev_err(&card->netdev->dev,
+			        "Not enough memory to allocate rx buffer\n");
+		card->spider_stats.alloc_rx_skb_error++;
+		return -ENOMEM;
+	}
+	hwdescr->buf_size = bufsize;
+	hwdescr->result_size = 0;
+	hwdescr->valid_size = 0;
+	hwdescr->data_status = 0;
+	hwdescr->data_error = 0;
+
+	offset = ((unsigned long)descr->skb->data) &
+		(SPIDER_NET_RXBUF_ALIGN - 1);
+	if (offset)
+		skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
+	/* iommu-map the skb */
+	buf = pci_map_single(card->pdev, descr->skb->data,
+			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
+	if (pci_dma_mapping_error(card->pdev, buf)) {
+		dev_kfree_skb_any(descr->skb);
+		descr->skb = NULL;
+		if (netif_msg_rx_err(card) && net_ratelimit())
+			dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
+		card->spider_stats.rx_iommu_map_error++;
+		hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
+	} else {
+		hwdescr->buf_addr = buf;
+		wmb();
+		hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
+					 SPIDER_NET_DMAC_NOINTR_COMPLETE;
+	}
+
+	return 0;
+}
+
+/**
+ * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
+ * @card: card structure
+ *
+ * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
+ * chip by writing to the appropriate register. DMA is enabled in
+ * spider_net_enable_rxdmac.
+ */
+static inline void
+spider_net_enable_rxchtails(struct spider_net_card *card)
+{
+	/* assume chain is aligned correctly */
+	spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
+			     card->rx_chain.tail->bus_addr);
+}
+
+/**
+ * spider_net_enable_rxdmac - enables a receive DMA controller
+ * @card: card structure
+ *
+ * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
+ * in the GDADMACCNTR register
+ */
+static inline void
+spider_net_enable_rxdmac(struct spider_net_card *card)
+{
+	wmb();
+	spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
+			     SPIDER_NET_DMA_RX_VALUE);
+}
+
+/**
+ * spider_net_disable_rxdmac - disables the receive DMA controller
+ * @card: card structure
+ *
+ * spider_net_disable_rxdmac terminates processing on the DMA controller
+ * by turing off the DMA controller, with the force-end flag set.
+ */
+static inline void
+spider_net_disable_rxdmac(struct spider_net_card *card)
+{
+	spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
+			     SPIDER_NET_DMA_RX_FEND_VALUE);
+}
+
+/**
+ * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
+ * @card: card structure
+ *
+ * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
+ */
+static void
+spider_net_refill_rx_chain(struct spider_net_card *card)
+{
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	unsigned long flags;
+
+	/* one context doing the refill (and a second context seeing that
+	 * and omitting it) is ok. If called by NAPI, we'll be called again
+	 * as spider_net_decode_one_descr is called several times. If some
+	 * interrupt calls us, the NAPI is about to clean up anyway. */
+	if (!spin_trylock_irqsave(&chain->lock, flags))
+		return;
+
+	while (spider_net_get_descr_status(chain->head->hwdescr) ==
+			SPIDER_NET_DESCR_NOT_IN_USE) {
+		if (spider_net_prepare_rx_descr(card, chain->head))
+			break;
+		chain->head = chain->head->next;
+	}
+
+	spin_unlock_irqrestore(&chain->lock, flags);
+}
+
+/**
+ * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
+ * @card: card structure
+ *
+ * Returns 0 on success, <0 on failure.
+ */
+static int
+spider_net_alloc_rx_skbs(struct spider_net_card *card)
+{
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *start = chain->tail;
+	struct spider_net_descr *descr = start;
+
+	/* Link up the hardware chain pointers */
+	do {
+		descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
+		descr = descr->next;
+	} while (descr != start);
+
+	/* Put at least one buffer into the chain. if this fails,
+	 * we've got a problem. If not, spider_net_refill_rx_chain
+	 * will do the rest at the end of this function. */
+	if (spider_net_prepare_rx_descr(card, chain->head))
+		goto error;
+	else
+		chain->head = chain->head->next;
+
+	/* This will allocate the rest of the rx buffers;
+	 * if not, it's business as usual later on. */
+	spider_net_refill_rx_chain(card);
+	spider_net_enable_rxdmac(card);
+	return 0;
+
+error:
+	spider_net_free_rx_chain_contents(card);
+	return -ENOMEM;
+}
+
+/**
+ * spider_net_get_multicast_hash - generates hash for multicast filter table
+ * @addr: multicast address
+ *
+ * returns the hash value.
+ *
+ * spider_net_get_multicast_hash calculates a hash value for a given multicast
+ * address, that is used to set the multicast filter tables
+ */
+static u8
+spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
+{
+	u32 crc;
+	u8 hash;
+	char addr_for_crc[ETH_ALEN] = { 0, };
+	int i, bit;
+
+	for (i = 0; i < ETH_ALEN * 8; i++) {
+		bit = (addr[i / 8] >> (i % 8)) & 1;
+		addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
+	}
+
+	crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
+
+	hash = (crc >> 27);
+	hash <<= 3;
+	hash |= crc & 7;
+	hash &= 0xff;
+
+	return hash;
+}
+
+/**
+ * spider_net_set_multi - sets multicast addresses and promisc flags
+ * @netdev: interface device structure
+ *
+ * spider_net_set_multi configures multicast addresses as needed for the
+ * netdev interface. It also sets up multicast, allmulti and promisc
+ * flags appropriately
+ */
+static void
+spider_net_set_multi(struct net_device *netdev)
+{
+	struct netdev_hw_addr *ha;
+	u8 hash;
+	int i;
+	u32 reg;
+	struct spider_net_card *card = netdev_priv(netdev);
+	unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
+		{0, };
+
+	spider_net_set_promisc(card);
+
+	if (netdev->flags & IFF_ALLMULTI) {
+		for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
+			set_bit(i, bitmask);
+		}
+		goto write_hash;
+	}
+
+	/* well, we know, what the broadcast hash value is: it's xfd
+	hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
+	set_bit(0xfd, bitmask);
+
+	netdev_for_each_mc_addr(ha, netdev) {
+		hash = spider_net_get_multicast_hash(netdev, ha->addr);
+		set_bit(hash, bitmask);
+	}
+
+write_hash:
+	for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
+		reg = 0;
+		if (test_bit(i * 4, bitmask))
+			reg += 0x08;
+		reg <<= 8;
+		if (test_bit(i * 4 + 1, bitmask))
+			reg += 0x08;
+		reg <<= 8;
+		if (test_bit(i * 4 + 2, bitmask))
+			reg += 0x08;
+		reg <<= 8;
+		if (test_bit(i * 4 + 3, bitmask))
+			reg += 0x08;
+
+		spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
+	}
+}
+
+/**
+ * spider_net_prepare_tx_descr - fill tx descriptor with skb data
+ * @card: card structure
+ * @skb: packet to use
+ *
+ * returns 0 on success, <0 on failure.
+ *
+ * fills out the descriptor structure with skb data and len. Copies data,
+ * if needed (32bit DMA!)
+ */
+static int
+spider_net_prepare_tx_descr(struct spider_net_card *card,
+			    struct sk_buff *skb)
+{
+	struct spider_net_descr_chain *chain = &card->tx_chain;
+	struct spider_net_descr *descr;
+	struct spider_net_hw_descr *hwdescr;
+	dma_addr_t buf;
+	unsigned long flags;
+
+	buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
+	if (pci_dma_mapping_error(card->pdev, buf)) {
+		if (netif_msg_tx_err(card) && net_ratelimit())
+			dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
+				  "Dropping packet\n", skb->data, skb->len);
+		card->spider_stats.tx_iommu_map_error++;
+		return -ENOMEM;
+	}
+
+	spin_lock_irqsave(&chain->lock, flags);
+	descr = card->tx_chain.head;
+	if (descr->next == chain->tail->prev) {
+		spin_unlock_irqrestore(&chain->lock, flags);
+		pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
+		return -ENOMEM;
+	}
+	hwdescr = descr->hwdescr;
+	chain->head = descr->next;
+
+	descr->skb = skb;
+	hwdescr->buf_addr = buf;
+	hwdescr->buf_size = skb->len;
+	hwdescr->next_descr_addr = 0;
+	hwdescr->data_status = 0;
+
+	hwdescr->dmac_cmd_status =
+			SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
+	spin_unlock_irqrestore(&chain->lock, flags);
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		switch (ip_hdr(skb)->protocol) {
+		case IPPROTO_TCP:
+			hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
+			break;
+		case IPPROTO_UDP:
+			hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
+			break;
+		}
+
+	/* Chain the bus address, so that the DMA engine finds this descr. */
+	wmb();
+	descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
+
+	card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
+	return 0;
+}
+
+static int
+spider_net_set_low_watermark(struct spider_net_card *card)
+{
+	struct spider_net_descr *descr = card->tx_chain.tail;
+	struct spider_net_hw_descr *hwdescr;
+	unsigned long flags;
+	int status;
+	int cnt=0;
+	int i;
+
+	/* Measure the length of the queue. Measurement does not
+	 * need to be precise -- does not need a lock. */
+	while (descr != card->tx_chain.head) {
+		status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
+		if (status == SPIDER_NET_DESCR_NOT_IN_USE)
+			break;
+		descr = descr->next;
+		cnt++;
+	}
+
+	/* If TX queue is short, don't even bother with interrupts */
+	if (cnt < card->tx_chain.num_desc/4)
+		return cnt;
+
+	/* Set low-watermark 3/4th's of the way into the queue. */
+	descr = card->tx_chain.tail;
+	cnt = (cnt*3)/4;
+	for (i=0;i<cnt; i++)
+		descr = descr->next;
+
+	/* Set the new watermark, clear the old watermark */
+	spin_lock_irqsave(&card->tx_chain.lock, flags);
+	descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
+	if (card->low_watermark && card->low_watermark != descr) {
+		hwdescr = card->low_watermark->hwdescr;
+		hwdescr->dmac_cmd_status =
+		     hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
+	}
+	card->low_watermark = descr;
+	spin_unlock_irqrestore(&card->tx_chain.lock, flags);
+	return cnt;
+}
+
+/**
+ * spider_net_release_tx_chain - processes sent tx descriptors
+ * @card: adapter structure
+ * @brutal: if set, don't care about whether descriptor seems to be in use
+ *
+ * returns 0 if the tx ring is empty, otherwise 1.
+ *
+ * spider_net_release_tx_chain releases the tx descriptors that spider has
+ * finished with (if non-brutal) or simply release tx descriptors (if brutal).
+ * If some other context is calling this function, we return 1 so that we're
+ * scheduled again (if we were scheduled) and will not lose initiative.
+ */
+static int
+spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
+{
+	struct net_device *dev = card->netdev;
+	struct spider_net_descr_chain *chain = &card->tx_chain;
+	struct spider_net_descr *descr;
+	struct spider_net_hw_descr *hwdescr;
+	struct sk_buff *skb;
+	u32 buf_addr;
+	unsigned long flags;
+	int status;
+
+	while (1) {
+		spin_lock_irqsave(&chain->lock, flags);
+		if (chain->tail == chain->head) {
+			spin_unlock_irqrestore(&chain->lock, flags);
+			return 0;
+		}
+		descr = chain->tail;
+		hwdescr = descr->hwdescr;
+
+		status = spider_net_get_descr_status(hwdescr);
+		switch (status) {
+		case SPIDER_NET_DESCR_COMPLETE:
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes += descr->skb->len;
+			break;
+
+		case SPIDER_NET_DESCR_CARDOWNED:
+			if (!brutal) {
+				spin_unlock_irqrestore(&chain->lock, flags);
+				return 1;
+			}
+
+			/* fallthrough, if we release the descriptors
+			 * brutally (then we don't care about
+			 * SPIDER_NET_DESCR_CARDOWNED) */
+
+		case SPIDER_NET_DESCR_RESPONSE_ERROR:
+		case SPIDER_NET_DESCR_PROTECTION_ERROR:
+		case SPIDER_NET_DESCR_FORCE_END:
+			if (netif_msg_tx_err(card))
+				dev_err(&card->netdev->dev, "forcing end of tx descriptor "
+				       "with status x%02x\n", status);
+			dev->stats.tx_errors++;
+			break;
+
+		default:
+			dev->stats.tx_dropped++;
+			if (!brutal) {
+				spin_unlock_irqrestore(&chain->lock, flags);
+				return 1;
+			}
+		}
+
+		chain->tail = descr->next;
+		hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
+		skb = descr->skb;
+		descr->skb = NULL;
+		buf_addr = hwdescr->buf_addr;
+		spin_unlock_irqrestore(&chain->lock, flags);
+
+		/* unmap the skb */
+		if (skb) {
+			pci_unmap_single(card->pdev, buf_addr, skb->len,
+					PCI_DMA_TODEVICE);
+			dev_kfree_skb(skb);
+		}
+	}
+	return 0;
+}
+
+/**
+ * spider_net_kick_tx_dma - enables TX DMA processing
+ * @card: card structure
+ *
+ * This routine will start the transmit DMA running if
+ * it is not already running. This routine ned only be
+ * called when queueing a new packet to an empty tx queue.
+ * Writes the current tx chain head as start address
+ * of the tx descriptor chain and enables the transmission
+ * DMA engine.
+ */
+static inline void
+spider_net_kick_tx_dma(struct spider_net_card *card)
+{
+	struct spider_net_descr *descr;
+
+	if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
+			SPIDER_NET_TX_DMA_EN)
+		goto out;
+
+	descr = card->tx_chain.tail;
+	for (;;) {
+		if (spider_net_get_descr_status(descr->hwdescr) ==
+				SPIDER_NET_DESCR_CARDOWNED) {
+			spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
+					descr->bus_addr);
+			spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
+					SPIDER_NET_DMA_TX_VALUE);
+			break;
+		}
+		if (descr == card->tx_chain.head)
+			break;
+		descr = descr->next;
+	}
+
+out:
+	mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
+}
+
+/**
+ * spider_net_xmit - transmits a frame over the device
+ * @skb: packet to send out
+ * @netdev: interface device structure
+ *
+ * returns 0 on success, !0 on failure
+ */
+static int
+spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	int cnt;
+	struct spider_net_card *card = netdev_priv(netdev);
+
+	spider_net_release_tx_chain(card, 0);
+
+	if (spider_net_prepare_tx_descr(card, skb) != 0) {
+		netdev->stats.tx_dropped++;
+		netif_stop_queue(netdev);
+		return NETDEV_TX_BUSY;
+	}
+
+	cnt = spider_net_set_low_watermark(card);
+	if (cnt < 5)
+		spider_net_kick_tx_dma(card);
+	return NETDEV_TX_OK;
+}
+
+/**
+ * spider_net_cleanup_tx_ring - cleans up the TX ring
+ * @card: card structure
+ *
+ * spider_net_cleanup_tx_ring is called by either the tx_timer
+ * or from the NAPI polling routine.
+ * This routine releases resources associted with transmitted
+ * packets, including updating the queue tail pointer.
+ */
+static void
+spider_net_cleanup_tx_ring(struct spider_net_card *card)
+{
+	if ((spider_net_release_tx_chain(card, 0) != 0) &&
+	    (card->netdev->flags & IFF_UP)) {
+		spider_net_kick_tx_dma(card);
+		netif_wake_queue(card->netdev);
+	}
+}
+
+/**
+ * spider_net_do_ioctl - called for device ioctls
+ * @netdev: interface device structure
+ * @ifr: request parameter structure for ioctl
+ * @cmd: command code for ioctl
+ *
+ * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
+ * -EOPNOTSUPP is returned, if an unknown ioctl was requested
+ */
+static int
+spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	switch (cmd) {
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+/**
+ * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
+ * @descr: descriptor to process
+ * @card: card structure
+ *
+ * Fills out skb structure and passes the data to the stack.
+ * The descriptor state is not changed.
+ */
+static void
+spider_net_pass_skb_up(struct spider_net_descr *descr,
+		       struct spider_net_card *card)
+{
+	struct spider_net_hw_descr *hwdescr = descr->hwdescr;
+	struct sk_buff *skb = descr->skb;
+	struct net_device *netdev = card->netdev;
+	u32 data_status = hwdescr->data_status;
+	u32 data_error = hwdescr->data_error;
+
+	skb_put(skb, hwdescr->valid_size);
+
+	/* the card seems to add 2 bytes of junk in front
+	 * of the ethernet frame */
+#define SPIDER_MISALIGN		2
+	skb_pull(skb, SPIDER_MISALIGN);
+	skb->protocol = eth_type_trans(skb, netdev);
+
+	/* checksum offload */
+	skb_checksum_none_assert(skb);
+	if (netdev->features & NETIF_F_RXCSUM) {
+		if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
+		       SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
+		     !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+
+	if (data_status & SPIDER_NET_VLAN_PACKET) {
+		/* further enhancements: HW-accel VLAN */
+	}
+
+	/* update netdevice statistics */
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += skb->len;
+
+	/* pass skb up to stack */
+	netif_receive_skb(skb);
+}
+
+static void show_rx_chain(struct spider_net_card *card)
+{
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *start= chain->tail;
+	struct spider_net_descr *descr= start;
+	struct spider_net_hw_descr *hwd = start->hwdescr;
+	struct device *dev = &card->netdev->dev;
+	u32 curr_desc, next_desc;
+	int status;
+
+	int tot = 0;
+	int cnt = 0;
+	int off = start - chain->ring;
+	int cstat = hwd->dmac_cmd_status;
+
+	dev_info(dev, "Total number of descrs=%d\n",
+		chain->num_desc);
+	dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
+		off, cstat);
+
+	curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
+	next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
+
+	status = cstat;
+	do
+	{
+		hwd = descr->hwdescr;
+		off = descr - chain->ring;
+		status = hwd->dmac_cmd_status;
+
+		if (descr == chain->head)
+			dev_info(dev, "Chain head is at %d, head status=0x%x\n",
+			         off, status);
+
+		if (curr_desc == descr->bus_addr)
+			dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
+			         off, status);
+
+		if (next_desc == descr->bus_addr)
+			dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
+			         off, status);
+
+		if (hwd->next_descr_addr == 0)
+			dev_info(dev, "chain is cut at %d\n", off);
+
+		if (cstat != status) {
+			int from = (chain->num_desc + off - cnt) % chain->num_desc;
+			int to = (chain->num_desc + off - 1) % chain->num_desc;
+			dev_info(dev, "Have %d (from %d to %d) descrs "
+			         "with stat=0x%08x\n", cnt, from, to, cstat);
+			cstat = status;
+			cnt = 0;
+		}
+
+		cnt ++;
+		tot ++;
+		descr = descr->next;
+	} while (descr != start);
+
+	dev_info(dev, "Last %d descrs with stat=0x%08x "
+	         "for a total of %d descrs\n", cnt, cstat, tot);
+
+#ifdef DEBUG
+	/* Now dump the whole ring */
+	descr = start;
+	do
+	{
+		struct spider_net_hw_descr *hwd = descr->hwdescr;
+		status = spider_net_get_descr_status(hwd);
+		cnt = descr - chain->ring;
+		dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
+		         cnt, status, descr->skb);
+		dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
+		         descr->bus_addr, hwd->buf_addr, hwd->buf_size);
+		dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
+		         hwd->next_descr_addr, hwd->result_size,
+		         hwd->valid_size);
+		dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
+		         hwd->dmac_cmd_status, hwd->data_status,
+		         hwd->data_error);
+		dev_info(dev, "\n");
+
+		descr = descr->next;
+	} while (descr != start);
+#endif
+
+}
+
+/**
+ * spider_net_resync_head_ptr - Advance head ptr past empty descrs
+ *
+ * If the driver fails to keep up and empty the queue, then the
+ * hardware wil run out of room to put incoming packets. This
+ * will cause the hardware to skip descrs that are full (instead
+ * of halting/retrying). Thus, once the driver runs, it wil need
+ * to "catch up" to where the hardware chain pointer is at.
+ */
+static void spider_net_resync_head_ptr(struct spider_net_card *card)
+{
+	unsigned long flags;
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *descr;
+	int i, status;
+
+	/* Advance head pointer past any empty descrs */
+	descr = chain->head;
+	status = spider_net_get_descr_status(descr->hwdescr);
+
+	if (status == SPIDER_NET_DESCR_NOT_IN_USE)
+		return;
+
+	spin_lock_irqsave(&chain->lock, flags);
+
+	descr = chain->head;
+	status = spider_net_get_descr_status(descr->hwdescr);
+	for (i=0; i<chain->num_desc; i++) {
+		if (status != SPIDER_NET_DESCR_CARDOWNED) break;
+		descr = descr->next;
+		status = spider_net_get_descr_status(descr->hwdescr);
+	}
+	chain->head = descr;
+
+	spin_unlock_irqrestore(&chain->lock, flags);
+}
+
+static int spider_net_resync_tail_ptr(struct spider_net_card *card)
+{
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *descr;
+	int i, status;
+
+	/* Advance tail pointer past any empty and reaped descrs */
+	descr = chain->tail;
+	status = spider_net_get_descr_status(descr->hwdescr);
+
+	for (i=0; i<chain->num_desc; i++) {
+		if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
+		    (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
+		descr = descr->next;
+		status = spider_net_get_descr_status(descr->hwdescr);
+	}
+	chain->tail = descr;
+
+	if ((i == chain->num_desc) || (i == 0))
+		return 1;
+	return 0;
+}
+
+/**
+ * spider_net_decode_one_descr - processes an RX descriptor
+ * @card: card structure
+ *
+ * Returns 1 if a packet has been sent to the stack, otherwise 0.
+ *
+ * Processes an RX descriptor by iommu-unmapping the data buffer
+ * and passing the packet up to the stack. This function is called
+ * in softirq context, e.g. either bottom half from interrupt or
+ * NAPI polling context.
+ */
+static int
+spider_net_decode_one_descr(struct spider_net_card *card)
+{
+	struct net_device *dev = card->netdev;
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *descr = chain->tail;
+	struct spider_net_hw_descr *hwdescr = descr->hwdescr;
+	u32 hw_buf_addr;
+	int status;
+
+	status = spider_net_get_descr_status(hwdescr);
+
+	/* Nothing in the descriptor, or ring must be empty */
+	if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
+	    (status == SPIDER_NET_DESCR_NOT_IN_USE))
+		return 0;
+
+	/* descriptor definitively used -- move on tail */
+	chain->tail = descr->next;
+
+	/* unmap descriptor */
+	hw_buf_addr = hwdescr->buf_addr;
+	hwdescr->buf_addr = 0xffffffff;
+	pci_unmap_single(card->pdev, hw_buf_addr,
+			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
+
+	if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
+	     (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
+	     (status == SPIDER_NET_DESCR_FORCE_END) ) {
+		if (netif_msg_rx_err(card))
+			dev_err(&dev->dev,
+			       "dropping RX descriptor with state %d\n", status);
+		dev->stats.rx_dropped++;
+		goto bad_desc;
+	}
+
+	if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
+	     (status != SPIDER_NET_DESCR_FRAME_END) ) {
+		if (netif_msg_rx_err(card))
+			dev_err(&card->netdev->dev,
+			       "RX descriptor with unknown state %d\n", status);
+		card->spider_stats.rx_desc_unk_state++;
+		goto bad_desc;
+	}
+
+	/* The cases we'll throw away the packet immediately */
+	if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
+		if (netif_msg_rx_err(card))
+			dev_err(&card->netdev->dev,
+			       "error in received descriptor found, "
+			       "data_status=x%08x, data_error=x%08x\n",
+			       hwdescr->data_status, hwdescr->data_error);
+		goto bad_desc;
+	}
+
+	if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
+		dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
+			       hwdescr->dmac_cmd_status);
+		pr_err("buf_addr=x%08x\n", hw_buf_addr);
+		pr_err("buf_size=x%08x\n", hwdescr->buf_size);
+		pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
+		pr_err("result_size=x%08x\n", hwdescr->result_size);
+		pr_err("valid_size=x%08x\n", hwdescr->valid_size);
+		pr_err("data_status=x%08x\n", hwdescr->data_status);
+		pr_err("data_error=x%08x\n", hwdescr->data_error);
+		pr_err("which=%ld\n", descr - card->rx_chain.ring);
+
+		card->spider_stats.rx_desc_error++;
+		goto bad_desc;
+	}
+
+	/* Ok, we've got a packet in descr */
+	spider_net_pass_skb_up(descr, card);
+	descr->skb = NULL;
+	hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
+	return 1;
+
+bad_desc:
+	if (netif_msg_rx_err(card))
+		show_rx_chain(card);
+	dev_kfree_skb_irq(descr->skb);
+	descr->skb = NULL;
+	hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
+	return 0;
+}
+
+/**
+ * spider_net_poll - NAPI poll function called by the stack to return packets
+ * @netdev: interface device structure
+ * @budget: number of packets we can pass to the stack at most
+ *
+ * returns 0 if no more packets available to the driver/stack. Returns 1,
+ * if the quota is exceeded, but the driver has still packets.
+ *
+ * spider_net_poll returns all packets from the rx descriptors to the stack
+ * (using netif_receive_skb). If all/enough packets are up, the driver
+ * reenables interrupts and returns 0. If not, 1 is returned.
+ */
+static int spider_net_poll(struct napi_struct *napi, int budget)
+{
+	struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
+	int packets_done = 0;
+
+	while (packets_done < budget) {
+		if (!spider_net_decode_one_descr(card))
+			break;
+
+		packets_done++;
+	}
+
+	if ((packets_done == 0) && (card->num_rx_ints != 0)) {
+		if (!spider_net_resync_tail_ptr(card))
+			packets_done = budget;
+		spider_net_resync_head_ptr(card);
+	}
+	card->num_rx_ints = 0;
+
+	spider_net_refill_rx_chain(card);
+	spider_net_enable_rxdmac(card);
+
+	spider_net_cleanup_tx_ring(card);
+
+	/* if all packets are in the stack, enable interrupts and return 0 */
+	/* if not, return 1 */
+	if (packets_done < budget) {
+		napi_complete(napi);
+		spider_net_rx_irq_on(card);
+		card->ignore_rx_ramfull = 0;
+	}
+
+	return packets_done;
+}
+
+/**
+ * spider_net_change_mtu - changes the MTU of an interface
+ * @netdev: interface device structure
+ * @new_mtu: new MTU value
+ *
+ * returns 0 on success, <0 on failure
+ */
+static int
+spider_net_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	/* no need to re-alloc skbs or so -- the max mtu is about 2.3k
+	 * and mtu is outbound only anyway */
+	if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
+		(new_mtu > SPIDER_NET_MAX_MTU) )
+		return -EINVAL;
+	netdev->mtu = new_mtu;
+	return 0;
+}
+
+/**
+ * spider_net_set_mac - sets the MAC of an interface
+ * @netdev: interface device structure
+ * @ptr: pointer to new MAC address
+ *
+ * Returns 0 on success, <0 on failure. Currently, we don't support this
+ * and will always return EOPNOTSUPP.
+ */
+static int
+spider_net_set_mac(struct net_device *netdev, void *p)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+	u32 macl, macu, regvalue;
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	/* switch off GMACTPE and GMACRPE */
+	regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
+	regvalue &= ~((1 << 5) | (1 << 6));
+	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
+
+	/* write mac */
+	macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
+		(addr->sa_data[2]<<8) + (addr->sa_data[3]);
+	macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
+	spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
+	spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
+
+	/* switch GMACTPE and GMACRPE back on */
+	regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
+	regvalue |= ((1 << 5) | (1 << 6));
+	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
+
+	spider_net_set_promisc(card);
+
+	/* look up, whether we have been successful */
+	if (spider_net_get_mac_address(netdev))
+		return -EADDRNOTAVAIL;
+	if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
+		return -EADDRNOTAVAIL;
+
+	return 0;
+}
+
+/**
+ * spider_net_link_reset
+ * @netdev: net device structure
+ *
+ * This is called when the PHY_LINK signal is asserted. For the blade this is
+ * not connected so we should never get here.
+ *
+ */
+static void
+spider_net_link_reset(struct net_device *netdev)
+{
+
+	struct spider_net_card *card = netdev_priv(netdev);
+
+	del_timer_sync(&card->aneg_timer);
+
+	/* clear interrupt, block further interrupts */
+	spider_net_write_reg(card, SPIDER_NET_GMACST,
+			     spider_net_read_reg(card, SPIDER_NET_GMACST));
+	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
+
+	/* reset phy and setup aneg */
+	card->aneg_count = 0;
+	card->medium = BCM54XX_COPPER;
+	spider_net_setup_aneg(card);
+	mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
+
+}
+
+/**
+ * spider_net_handle_error_irq - handles errors raised by an interrupt
+ * @card: card structure
+ * @status_reg: interrupt status register 0 (GHIINT0STS)
+ *
+ * spider_net_handle_error_irq treats or ignores all error conditions
+ * found when an interrupt is presented
+ */
+static void
+spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
+			    u32 error_reg1, u32 error_reg2)
+{
+	u32 i;
+	int show_error = 1;
+
+	/* check GHIINT0STS ************************************/
+	if (status_reg)
+		for (i = 0; i < 32; i++)
+			if (status_reg & (1<<i))
+				switch (i)
+	{
+	/* let error_reg1 and error_reg2 evaluation decide, what to do
+	case SPIDER_NET_PHYINT:
+	case SPIDER_NET_GMAC2INT:
+	case SPIDER_NET_GMAC1INT:
+	case SPIDER_NET_GFIFOINT:
+	case SPIDER_NET_DMACINT:
+	case SPIDER_NET_GSYSINT:
+		break; */
+
+	case SPIDER_NET_GIPSINT:
+		show_error = 0;
+		break;
+
+	case SPIDER_NET_GPWOPCMPINT:
+		/* PHY write operation completed */
+		show_error = 0;
+		break;
+	case SPIDER_NET_GPROPCMPINT:
+		/* PHY read operation completed */
+		/* we don't use semaphores, as we poll for the completion
+		 * of the read operation in spider_net_read_phy. Should take
+		 * about 50 us */
+		show_error = 0;
+		break;
+	case SPIDER_NET_GPWFFINT:
+		/* PHY command queue full */
+		if (netif_msg_intr(card))
+			dev_err(&card->netdev->dev, "PHY write queue full\n");
+		show_error = 0;
+		break;
+
+	/* case SPIDER_NET_GRMDADRINT: not used. print a message */
+	/* case SPIDER_NET_GRMARPINT: not used. print a message */
+	/* case SPIDER_NET_GRMMPINT: not used. print a message */
+
+	case SPIDER_NET_GDTDEN0INT:
+		/* someone has set TX_DMA_EN to 0 */
+		show_error = 0;
+		break;
+
+	case SPIDER_NET_GDDDEN0INT: /* fallthrough */
+	case SPIDER_NET_GDCDEN0INT: /* fallthrough */
+	case SPIDER_NET_GDBDEN0INT: /* fallthrough */
+	case SPIDER_NET_GDADEN0INT:
+		/* someone has set RX_DMA_EN to 0 */
+		show_error = 0;
+		break;
+
+	/* RX interrupts */
+	case SPIDER_NET_GDDFDCINT:
+	case SPIDER_NET_GDCFDCINT:
+	case SPIDER_NET_GDBFDCINT:
+	case SPIDER_NET_GDAFDCINT:
+	/* case SPIDER_NET_GDNMINT: not used. print a message */
+	/* case SPIDER_NET_GCNMINT: not used. print a message */
+	/* case SPIDER_NET_GBNMINT: not used. print a message */
+	/* case SPIDER_NET_GANMINT: not used. print a message */
+	/* case SPIDER_NET_GRFNMINT: not used. print a message */
+		show_error = 0;
+		break;
+
+	/* TX interrupts */
+	case SPIDER_NET_GDTFDCINT:
+		show_error = 0;
+		break;
+	case SPIDER_NET_GTTEDINT:
+		show_error = 0;
+		break;
+	case SPIDER_NET_GDTDCEINT:
+		/* chain end. If a descriptor should be sent, kick off
+		 * tx dma
+		if (card->tx_chain.tail != card->tx_chain.head)
+			spider_net_kick_tx_dma(card);
+		*/
+		show_error = 0;
+		break;
+
+	/* case SPIDER_NET_G1TMCNTINT: not used. print a message */
+	/* case SPIDER_NET_GFREECNTINT: not used. print a message */
+	}
+
+	/* check GHIINT1STS ************************************/
+	if (error_reg1)
+		for (i = 0; i < 32; i++)
+			if (error_reg1 & (1<<i))
+				switch (i)
+	{
+	case SPIDER_NET_GTMFLLINT:
+		/* TX RAM full may happen on a usual case.
+		 * Logging is not needed. */
+		show_error = 0;
+		break;
+	case SPIDER_NET_GRFDFLLINT: /* fallthrough */
+	case SPIDER_NET_GRFCFLLINT: /* fallthrough */
+	case SPIDER_NET_GRFBFLLINT: /* fallthrough */
+	case SPIDER_NET_GRFAFLLINT: /* fallthrough */
+	case SPIDER_NET_GRMFLLINT:
+		/* Could happen when rx chain is full */
+		if (card->ignore_rx_ramfull == 0) {
+			card->ignore_rx_ramfull = 1;
+			spider_net_resync_head_ptr(card);
+			spider_net_refill_rx_chain(card);
+			spider_net_enable_rxdmac(card);
+			card->num_rx_ints ++;
+			napi_schedule(&card->napi);
+		}
+		show_error = 0;
+		break;
+
+	/* case SPIDER_NET_GTMSHTINT: problem, print a message */
+	case SPIDER_NET_GDTINVDINT:
+		/* allrighty. tx from previous descr ok */
+		show_error = 0;
+		break;
+
+	/* chain end */
+	case SPIDER_NET_GDDDCEINT: /* fallthrough */
+	case SPIDER_NET_GDCDCEINT: /* fallthrough */
+	case SPIDER_NET_GDBDCEINT: /* fallthrough */
+	case SPIDER_NET_GDADCEINT:
+		spider_net_resync_head_ptr(card);
+		spider_net_refill_rx_chain(card);
+		spider_net_enable_rxdmac(card);
+		card->num_rx_ints ++;
+		napi_schedule(&card->napi);
+		show_error = 0;
+		break;
+
+	/* invalid descriptor */
+	case SPIDER_NET_GDDINVDINT: /* fallthrough */
+	case SPIDER_NET_GDCINVDINT: /* fallthrough */
+	case SPIDER_NET_GDBINVDINT: /* fallthrough */
+	case SPIDER_NET_GDAINVDINT:
+		/* Could happen when rx chain is full */
+		spider_net_resync_head_ptr(card);
+		spider_net_refill_rx_chain(card);
+		spider_net_enable_rxdmac(card);
+		card->num_rx_ints ++;
+		napi_schedule(&card->napi);
+		show_error = 0;
+		break;
+
+	/* case SPIDER_NET_GDTRSERINT: problem, print a message */
+	/* case SPIDER_NET_GDDRSERINT: problem, print a message */
+	/* case SPIDER_NET_GDCRSERINT: problem, print a message */
+	/* case SPIDER_NET_GDBRSERINT: problem, print a message */
+	/* case SPIDER_NET_GDARSERINT: problem, print a message */
+	/* case SPIDER_NET_GDSERINT: problem, print a message */
+	/* case SPIDER_NET_GDTPTERINT: problem, print a message */
+	/* case SPIDER_NET_GDDPTERINT: problem, print a message */
+	/* case SPIDER_NET_GDCPTERINT: problem, print a message */
+	/* case SPIDER_NET_GDBPTERINT: problem, print a message */
+	/* case SPIDER_NET_GDAPTERINT: problem, print a message */
+	default:
+		show_error = 1;
+		break;
+	}
+
+	/* check GHIINT2STS ************************************/
+	if (error_reg2)
+		for (i = 0; i < 32; i++)
+			if (error_reg2 & (1<<i))
+				switch (i)
+	{
+	/* there is nothing we can (want  to) do at this time. Log a
+	 * message, we can switch on and off the specific values later on
+	case SPIDER_NET_GPROPERINT:
+	case SPIDER_NET_GMCTCRSNGINT:
+	case SPIDER_NET_GMCTLCOLINT:
+	case SPIDER_NET_GMCTTMOTINT:
+	case SPIDER_NET_GMCRCAERINT:
+	case SPIDER_NET_GMCRCALERINT:
+	case SPIDER_NET_GMCRALNERINT:
+	case SPIDER_NET_GMCROVRINT:
+	case SPIDER_NET_GMCRRNTINT:
+	case SPIDER_NET_GMCRRXERINT:
+	case SPIDER_NET_GTITCSERINT:
+	case SPIDER_NET_GTIFMTERINT:
+	case SPIDER_NET_GTIPKTRVKINT:
+	case SPIDER_NET_GTISPINGINT:
+	case SPIDER_NET_GTISADNGINT:
+	case SPIDER_NET_GTISPDNGINT:
+	case SPIDER_NET_GRIFMTERINT:
+	case SPIDER_NET_GRIPKTRVKINT:
+	case SPIDER_NET_GRISPINGINT:
+	case SPIDER_NET_GRISADNGINT:
+	case SPIDER_NET_GRISPDNGINT:
+		break;
+	*/
+		default:
+			break;
+	}
+
+	if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
+		dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
+		       "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
+		       status_reg, error_reg1, error_reg2);
+
+	/* clear interrupt sources */
+	spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
+}
+
+/**
+ * spider_net_interrupt - interrupt handler for spider_net
+ * @irq: interrupt number
+ * @ptr: pointer to net_device
+ *
+ * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
+ * interrupt found raised by card.
+ *
+ * This is the interrupt handler, that turns off
+ * interrupts for this device and makes the stack poll the driver
+ */
+static irqreturn_t
+spider_net_interrupt(int irq, void *ptr)
+{
+	struct net_device *netdev = ptr;
+	struct spider_net_card *card = netdev_priv(netdev);
+	u32 status_reg, error_reg1, error_reg2;
+
+	status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
+	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
+	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
+
+	if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
+	    !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
+	    !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
+		return IRQ_NONE;
+
+	if (status_reg & SPIDER_NET_RXINT ) {
+		spider_net_rx_irq_off(card);
+		napi_schedule(&card->napi);
+		card->num_rx_ints ++;
+	}
+	if (status_reg & SPIDER_NET_TXINT)
+		napi_schedule(&card->napi);
+
+	if (status_reg & SPIDER_NET_LINKINT)
+		spider_net_link_reset(netdev);
+
+	if (status_reg & SPIDER_NET_ERRINT )
+		spider_net_handle_error_irq(card, status_reg,
+					    error_reg1, error_reg2);
+
+	/* clear interrupt sources */
+	spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/**
+ * spider_net_poll_controller - artificial interrupt for netconsole etc.
+ * @netdev: interface device structure
+ *
+ * see Documentation/networking/netconsole.txt
+ */
+static void
+spider_net_poll_controller(struct net_device *netdev)
+{
+	disable_irq(netdev->irq);
+	spider_net_interrupt(netdev->irq, netdev);
+	enable_irq(netdev->irq);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
+/**
+ * spider_net_enable_interrupts - enable interrupts
+ * @card: card structure
+ *
+ * spider_net_enable_interrupt enables several interrupts
+ */
+static void
+spider_net_enable_interrupts(struct spider_net_card *card)
+{
+	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
+			     SPIDER_NET_INT0_MASK_VALUE);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
+			     SPIDER_NET_INT1_MASK_VALUE);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
+			     SPIDER_NET_INT2_MASK_VALUE);
+}
+
+/**
+ * spider_net_disable_interrupts - disable interrupts
+ * @card: card structure
+ *
+ * spider_net_disable_interrupts disables all the interrupts
+ */
+static void
+spider_net_disable_interrupts(struct spider_net_card *card)
+{
+	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
+	spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
+	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
+}
+
+/**
+ * spider_net_init_card - initializes the card
+ * @card: card structure
+ *
+ * spider_net_init_card initializes the card so that other registers can
+ * be used
+ */
+static void
+spider_net_init_card(struct spider_net_card *card)
+{
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_STOP_VALUE);
+
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_RUN_VALUE);
+
+	/* trigger ETOMOD signal */
+	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
+		spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
+
+	spider_net_disable_interrupts(card);
+}
+
+/**
+ * spider_net_enable_card - enables the card by setting all kinds of regs
+ * @card: card structure
+ *
+ * spider_net_enable_card sets a lot of SMMIO registers to enable the device
+ */
+static void
+spider_net_enable_card(struct spider_net_card *card)
+{
+	int i;
+	/* the following array consists of (register),(value) pairs
+	 * that are set in this function. A register of 0 ends the list */
+	u32 regs[][2] = {
+		{ SPIDER_NET_GRESUMINTNUM, 0 },
+		{ SPIDER_NET_GREINTNUM, 0 },
+
+		/* set interrupt frame number registers */
+		/* clear the single DMA engine registers first */
+		{ SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
+		{ SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
+		{ SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
+		{ SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
+		/* then set, what we really need */
+		{ SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
+
+		/* timer counter registers and stuff */
+		{ SPIDER_NET_GFREECNNUM, 0 },
+		{ SPIDER_NET_GONETIMENUM, 0 },
+		{ SPIDER_NET_GTOUTFRMNUM, 0 },
+
+		/* RX mode setting */
+		{ SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
+		/* TX mode setting */
+		{ SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
+		/* IPSEC mode setting */
+		{ SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
+
+		{ SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
+
+		{ SPIDER_NET_GMRWOLCTRL, 0 },
+		{ SPIDER_NET_GTESTMD, 0x10000000 },
+		{ SPIDER_NET_GTTQMSK, 0x00400040 },
+
+		{ SPIDER_NET_GMACINTEN, 0 },
+
+		/* flow control stuff */
+		{ SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
+		{ SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
+
+		{ SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
+		{ 0, 0}
+	};
+
+	i = 0;
+	while (regs[i][0]) {
+		spider_net_write_reg(card, regs[i][0], regs[i][1]);
+		i++;
+	}
+
+	/* clear unicast filter table entries 1 to 14 */
+	for (i = 1; i <= 14; i++) {
+		spider_net_write_reg(card,
+				     SPIDER_NET_GMRUAFILnR + i * 8,
+				     0x00080000);
+		spider_net_write_reg(card,
+				     SPIDER_NET_GMRUAFILnR + i * 8 + 4,
+				     0x00000000);
+	}
+
+	spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
+
+	spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
+
+	/* set chain tail address for RX chains and
+	 * enable DMA */
+	spider_net_enable_rxchtails(card);
+	spider_net_enable_rxdmac(card);
+
+	spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
+
+	spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
+			     SPIDER_NET_LENLMT_VALUE);
+	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
+			     SPIDER_NET_OPMODE_VALUE);
+
+	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
+			     SPIDER_NET_GDTBSTA);
+}
+
+/**
+ * spider_net_download_firmware - loads firmware into the adapter
+ * @card: card structure
+ * @firmware_ptr: pointer to firmware data
+ *
+ * spider_net_download_firmware loads the firmware data into the
+ * adapter. It assumes the length etc. to be allright.
+ */
+static int
+spider_net_download_firmware(struct spider_net_card *card,
+			     const void *firmware_ptr)
+{
+	int sequencer, i;
+	const u32 *fw_ptr = firmware_ptr;
+
+	/* stop sequencers */
+	spider_net_write_reg(card, SPIDER_NET_GSINIT,
+			     SPIDER_NET_STOP_SEQ_VALUE);
+
+	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
+	     sequencer++) {
+		spider_net_write_reg(card,
+				     SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
+		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
+			spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
+					     sequencer * 8, *fw_ptr);
+			fw_ptr++;
+		}
+	}
+
+	if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
+		return -EIO;
+
+	spider_net_write_reg(card, SPIDER_NET_GSINIT,
+			     SPIDER_NET_RUN_SEQ_VALUE);
+
+	return 0;
+}
+
+/**
+ * spider_net_init_firmware - reads in firmware parts
+ * @card: card structure
+ *
+ * Returns 0 on success, <0 on failure
+ *
+ * spider_net_init_firmware opens the sequencer firmware and does some basic
+ * checks. This function opens and releases the firmware structure. A call
+ * to download the firmware is performed before the release.
+ *
+ * Firmware format
+ * ===============
+ * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
+ * the program for each sequencer. Use the command
+ *    tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt              \
+ *         Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt   \
+ *         Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
+ *
+ * to generate spider_fw.bin, if you have sequencer programs with something
+ * like the following contents for each sequencer:
+ *    <ONE LINE COMMENT>
+ *    <FIRST 4-BYTES-WORD FOR SEQUENCER>
+ *    <SECOND 4-BYTES-WORD FOR SEQUENCER>
+ *     ...
+ *    <1024th 4-BYTES-WORD FOR SEQUENCER>
+ */
+static int
+spider_net_init_firmware(struct spider_net_card *card)
+{
+	struct firmware *firmware = NULL;
+	struct device_node *dn;
+	const u8 *fw_prop = NULL;
+	int err = -ENOENT;
+	int fw_size;
+
+	if (request_firmware((const struct firmware **)&firmware,
+			     SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
+		if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
+		     netif_msg_probe(card) ) {
+			dev_err(&card->netdev->dev,
+			       "Incorrect size of spidernet firmware in " \
+			       "filesystem. Looking in host firmware...\n");
+			goto try_host_fw;
+		}
+		err = spider_net_download_firmware(card, firmware->data);
+
+		release_firmware(firmware);
+		if (err)
+			goto try_host_fw;
+
+		goto done;
+	}
+
+try_host_fw:
+	dn = pci_device_to_OF_node(card->pdev);
+	if (!dn)
+		goto out_err;
+
+	fw_prop = of_get_property(dn, "firmware", &fw_size);
+	if (!fw_prop)
+		goto out_err;
+
+	if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
+	     netif_msg_probe(card) ) {
+		dev_err(&card->netdev->dev,
+		       "Incorrect size of spidernet firmware in host firmware\n");
+		goto done;
+	}
+
+	err = spider_net_download_firmware(card, fw_prop);
+
+done:
+	return err;
+out_err:
+	if (netif_msg_probe(card))
+		dev_err(&card->netdev->dev,
+		       "Couldn't find spidernet firmware in filesystem " \
+		       "or host firmware\n");
+	return err;
+}
+
+/**
+ * spider_net_open - called upon ifonfig up
+ * @netdev: interface device structure
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * spider_net_open allocates all the descriptors and memory needed for
+ * operation, sets up multicast list and enables interrupts
+ */
+int
+spider_net_open(struct net_device *netdev)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+	int result;
+
+	result = spider_net_init_firmware(card);
+	if (result)
+		goto init_firmware_failed;
+
+	/* start probing with copper */
+	card->aneg_count = 0;
+	card->medium = BCM54XX_COPPER;
+	spider_net_setup_aneg(card);
+	if (card->phy.def->phy_id)
+		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
+
+	result = spider_net_init_chain(card, &card->tx_chain);
+	if (result)
+		goto alloc_tx_failed;
+	card->low_watermark = NULL;
+
+	result = spider_net_init_chain(card, &card->rx_chain);
+	if (result)
+		goto alloc_rx_failed;
+
+	/* Allocate rx skbs */
+	if (spider_net_alloc_rx_skbs(card))
+		goto alloc_skbs_failed;
+
+	spider_net_set_multi(netdev);
+
+	/* further enhancement: setup hw vlan, if needed */
+
+	result = -EBUSY;
+	if (request_irq(netdev->irq, spider_net_interrupt,
+			     IRQF_SHARED, netdev->name, netdev))
+		goto register_int_failed;
+
+	spider_net_enable_card(card);
+
+	netif_start_queue(netdev);
+	netif_carrier_on(netdev);
+	napi_enable(&card->napi);
+
+	spider_net_enable_interrupts(card);
+
+	return 0;
+
+register_int_failed:
+	spider_net_free_rx_chain_contents(card);
+alloc_skbs_failed:
+	spider_net_free_chain(card, &card->rx_chain);
+alloc_rx_failed:
+	spider_net_free_chain(card, &card->tx_chain);
+alloc_tx_failed:
+	del_timer_sync(&card->aneg_timer);
+init_firmware_failed:
+	return result;
+}
+
+/**
+ * spider_net_link_phy
+ * @data: used for pointer to card structure
+ *
+ */
+static void spider_net_link_phy(unsigned long data)
+{
+	struct spider_net_card *card = (struct spider_net_card *)data;
+	struct mii_phy *phy = &card->phy;
+
+	/* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
+	if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
+
+		pr_debug("%s: link is down trying to bring it up\n",
+			 card->netdev->name);
+
+		switch (card->medium) {
+		case BCM54XX_COPPER:
+			/* enable fiber with autonegotiation first */
+			if (phy->def->ops->enable_fiber)
+				phy->def->ops->enable_fiber(phy, 1);
+			card->medium = BCM54XX_FIBER;
+			break;
+
+		case BCM54XX_FIBER:
+			/* fiber didn't come up, try to disable fiber autoneg */
+			if (phy->def->ops->enable_fiber)
+				phy->def->ops->enable_fiber(phy, 0);
+			card->medium = BCM54XX_UNKNOWN;
+			break;
+
+		case BCM54XX_UNKNOWN:
+			/* copper, fiber with and without failed,
+			 * retry from beginning */
+			spider_net_setup_aneg(card);
+			card->medium = BCM54XX_COPPER;
+			break;
+		}
+
+		card->aneg_count = 0;
+		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
+		return;
+	}
+
+	/* link still not up, try again later */
+	if (!(phy->def->ops->poll_link(phy))) {
+		card->aneg_count++;
+		mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
+		return;
+	}
+
+	/* link came up, get abilities */
+	phy->def->ops->read_link(phy);
+
+	spider_net_write_reg(card, SPIDER_NET_GMACST,
+			     spider_net_read_reg(card, SPIDER_NET_GMACST));
+	spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
+
+	if (phy->speed == 1000)
+		spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
+	else
+		spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
+
+	card->aneg_count = 0;
+
+	pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
+		card->netdev->name, phy->speed,
+		phy->duplex == 1 ? "Full" : "Half",
+		phy->autoneg == 1 ? "" : "no ");
+}
+
+/**
+ * spider_net_setup_phy - setup PHY
+ * @card: card structure
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * spider_net_setup_phy is used as part of spider_net_probe.
+ **/
+static int
+spider_net_setup_phy(struct spider_net_card *card)
+{
+	struct mii_phy *phy = &card->phy;
+
+	spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
+			     SPIDER_NET_DMASEL_VALUE);
+	spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
+			     SPIDER_NET_PHY_CTRL_VALUE);
+
+	phy->dev = card->netdev;
+	phy->mdio_read = spider_net_read_phy;
+	phy->mdio_write = spider_net_write_phy;
+
+	for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
+		unsigned short id;
+		id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
+		if (id != 0x0000 && id != 0xffff) {
+			if (!sungem_phy_probe(phy, phy->mii_id)) {
+				pr_info("Found %s.\n", phy->def->name);
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * spider_net_workaround_rxramfull - work around firmware bug
+ * @card: card structure
+ *
+ * no return value
+ **/
+static void
+spider_net_workaround_rxramfull(struct spider_net_card *card)
+{
+	int i, sequencer = 0;
+
+	/* cancel reset */
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_RUN_VALUE);
+
+	/* empty sequencer data */
+	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
+	     sequencer++) {
+		spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
+				     sequencer * 8, 0x0);
+		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
+			spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
+					     sequencer * 8, 0x0);
+		}
+	}
+
+	/* set sequencer operation */
+	spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
+
+	/* reset */
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_STOP_VALUE);
+}
+
+/**
+ * spider_net_stop - called upon ifconfig down
+ * @netdev: interface device structure
+ *
+ * always returns 0
+ */
+int
+spider_net_stop(struct net_device *netdev)
+{
+	struct spider_net_card *card = netdev_priv(netdev);
+
+	napi_disable(&card->napi);
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+	del_timer_sync(&card->tx_timer);
+	del_timer_sync(&card->aneg_timer);
+
+	spider_net_disable_interrupts(card);
+
+	free_irq(netdev->irq, netdev);
+
+	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
+			     SPIDER_NET_DMA_TX_FEND_VALUE);
+
+	/* turn off DMA, force end */
+	spider_net_disable_rxdmac(card);
+
+	/* release chains */
+	spider_net_release_tx_chain(card, 1);
+	spider_net_free_rx_chain_contents(card);
+
+	spider_net_free_chain(card, &card->tx_chain);
+	spider_net_free_chain(card, &card->rx_chain);
+
+	return 0;
+}
+
+/**
+ * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
+ * function (to be called not under interrupt status)
+ * @data: data, is interface device structure
+ *
+ * called as task when tx hangs, resets interface (if interface is up)
+ */
+static void
+spider_net_tx_timeout_task(struct work_struct *work)
+{
+	struct spider_net_card *card =
+		container_of(work, struct spider_net_card, tx_timeout_task);
+	struct net_device *netdev = card->netdev;
+
+	if (!(netdev->flags & IFF_UP))
+		goto out;
+
+	netif_device_detach(netdev);
+	spider_net_stop(netdev);
+
+	spider_net_workaround_rxramfull(card);
+	spider_net_init_card(card);
+
+	if (spider_net_setup_phy(card))
+		goto out;
+
+	spider_net_open(netdev);
+	spider_net_kick_tx_dma(card);
+	netif_device_attach(netdev);
+
+out:
+	atomic_dec(&card->tx_timeout_task_counter);
+}
+
+/**
+ * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
+ * @netdev: interface device structure
+ *
+ * called, if tx hangs. Schedules a task that resets the interface
+ */
+static void
+spider_net_tx_timeout(struct net_device *netdev)
+{
+	struct spider_net_card *card;
+
+	card = netdev_priv(netdev);
+	atomic_inc(&card->tx_timeout_task_counter);
+	if (netdev->flags & IFF_UP)
+		schedule_work(&card->tx_timeout_task);
+	else
+		atomic_dec(&card->tx_timeout_task_counter);
+	card->spider_stats.tx_timeouts++;
+}
+
+static const struct net_device_ops spider_net_ops = {
+	.ndo_open		= spider_net_open,
+	.ndo_stop		= spider_net_stop,
+	.ndo_start_xmit		= spider_net_xmit,
+	.ndo_set_rx_mode	= spider_net_set_multi,
+	.ndo_set_mac_address	= spider_net_set_mac,
+	.ndo_change_mtu		= spider_net_change_mtu,
+	.ndo_do_ioctl		= spider_net_do_ioctl,
+	.ndo_tx_timeout		= spider_net_tx_timeout,
+	.ndo_validate_addr	= eth_validate_addr,
+	/* HW VLAN */
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	/* poll controller */
+	.ndo_poll_controller	= spider_net_poll_controller,
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+};
+
+/**
+ * spider_net_setup_netdev_ops - initialization of net_device operations
+ * @netdev: net_device structure
+ *
+ * fills out function pointers in the net_device structure
+ */
+static void
+spider_net_setup_netdev_ops(struct net_device *netdev)
+{
+	netdev->netdev_ops = &spider_net_ops;
+	netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
+	/* ethtool ops */
+	netdev->ethtool_ops = &spider_net_ethtool_ops;
+}
+
+/**
+ * spider_net_setup_netdev - initialization of net_device
+ * @card: card structure
+ *
+ * Returns 0 on success or <0 on failure
+ *
+ * spider_net_setup_netdev initializes the net_device structure
+ **/
+static int
+spider_net_setup_netdev(struct spider_net_card *card)
+{
+	int result;
+	struct net_device *netdev = card->netdev;
+	struct device_node *dn;
+	struct sockaddr addr;
+	const u8 *mac;
+
+	SET_NETDEV_DEV(netdev, &card->pdev->dev);
+
+	pci_set_drvdata(card->pdev, netdev);
+
+	init_timer(&card->tx_timer);
+	card->tx_timer.function =
+		(void (*)(unsigned long)) spider_net_cleanup_tx_ring;
+	card->tx_timer.data = (unsigned long) card;
+	netdev->irq = card->pdev->irq;
+
+	card->aneg_count = 0;
+	init_timer(&card->aneg_timer);
+	card->aneg_timer.function = spider_net_link_phy;
+	card->aneg_timer.data = (unsigned long) card;
+
+	netif_napi_add(netdev, &card->napi,
+		       spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
+
+	spider_net_setup_netdev_ops(netdev);
+
+	netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
+	if (SPIDER_NET_RX_CSUM_DEFAULT)
+		netdev->features |= NETIF_F_RXCSUM;
+	netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
+	/* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
+	 *		NETIF_F_HW_VLAN_FILTER */
+
+	netdev->irq = card->pdev->irq;
+	card->num_rx_ints = 0;
+	card->ignore_rx_ramfull = 0;
+
+	dn = pci_device_to_OF_node(card->pdev);
+	if (!dn)
+		return -EIO;
+
+	mac = of_get_property(dn, "local-mac-address", NULL);
+	if (!mac)
+		return -EIO;
+	memcpy(addr.sa_data, mac, ETH_ALEN);
+
+	result = spider_net_set_mac(netdev, &addr);
+	if ((result) && (netif_msg_probe(card)))
+		dev_err(&card->netdev->dev,
+		        "Failed to set MAC address: %i\n", result);
+
+	result = register_netdev(netdev);
+	if (result) {
+		if (netif_msg_probe(card))
+			dev_err(&card->netdev->dev,
+			        "Couldn't register net_device: %i\n", result);
+		return result;
+	}
+
+	if (netif_msg_probe(card))
+		pr_info("Initialized device %s.\n", netdev->name);
+
+	return 0;
+}
+
+/**
+ * spider_net_alloc_card - allocates net_device and card structure
+ *
+ * returns the card structure or NULL in case of errors
+ *
+ * the card and net_device structures are linked to each other
+ */
+static struct spider_net_card *
+spider_net_alloc_card(void)
+{
+	struct net_device *netdev;
+	struct spider_net_card *card;
+	size_t alloc_size;
+
+	alloc_size = sizeof(struct spider_net_card) +
+	   (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr);
+	netdev = alloc_etherdev(alloc_size);
+	if (!netdev)
+		return NULL;
+
+	card = netdev_priv(netdev);
+	card->netdev = netdev;
+	card->msg_enable = SPIDER_NET_DEFAULT_MSG;
+	INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
+	init_waitqueue_head(&card->waitq);
+	atomic_set(&card->tx_timeout_task_counter, 0);
+
+	card->rx_chain.num_desc = rx_descriptors;
+	card->rx_chain.ring = card->darray;
+	card->tx_chain.num_desc = tx_descriptors;
+	card->tx_chain.ring = card->darray + rx_descriptors;
+
+	return card;
+}
+
+/**
+ * spider_net_undo_pci_setup - releases PCI ressources
+ * @card: card structure
+ *
+ * spider_net_undo_pci_setup releases the mapped regions
+ */
+static void
+spider_net_undo_pci_setup(struct spider_net_card *card)
+{
+	iounmap(card->regs);
+	pci_release_regions(card->pdev);
+}
+
+/**
+ * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
+ * @pdev: PCI device
+ *
+ * Returns the card structure or NULL if any errors occur
+ *
+ * spider_net_setup_pci_dev initializes pdev and together with the
+ * functions called in spider_net_open configures the device so that
+ * data can be transferred over it
+ * The net_device structure is attached to the card structure, if the
+ * function returns without error.
+ **/
+static struct spider_net_card *
+spider_net_setup_pci_dev(struct pci_dev *pdev)
+{
+	struct spider_net_card *card;
+	unsigned long mmio_start, mmio_len;
+
+	if (pci_enable_device(pdev)) {
+		dev_err(&pdev->dev, "Couldn't enable PCI device\n");
+		return NULL;
+	}
+
+	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
+		dev_err(&pdev->dev,
+		        "Couldn't find proper PCI device base address.\n");
+		goto out_disable_dev;
+	}
+
+	if (pci_request_regions(pdev, spider_net_driver_name)) {
+		dev_err(&pdev->dev,
+		        "Couldn't obtain PCI resources, aborting.\n");
+		goto out_disable_dev;
+	}
+
+	pci_set_master(pdev);
+
+	card = spider_net_alloc_card();
+	if (!card) {
+		dev_err(&pdev->dev,
+		        "Couldn't allocate net_device structure, aborting.\n");
+		goto out_release_regions;
+	}
+	card->pdev = pdev;
+
+	/* fetch base address and length of first resource */
+	mmio_start = pci_resource_start(pdev, 0);
+	mmio_len = pci_resource_len(pdev, 0);
+
+	card->netdev->mem_start = mmio_start;
+	card->netdev->mem_end = mmio_start + mmio_len;
+	card->regs = ioremap(mmio_start, mmio_len);
+
+	if (!card->regs) {
+		dev_err(&pdev->dev,
+		        "Couldn't obtain PCI resources, aborting.\n");
+		goto out_release_regions;
+	}
+
+	return card;
+
+out_release_regions:
+	pci_release_regions(pdev);
+out_disable_dev:
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+	return NULL;
+}
+
+/**
+ * spider_net_probe - initialization of a device
+ * @pdev: PCI device
+ * @ent: entry in the device id list
+ *
+ * Returns 0 on success, <0 on failure
+ *
+ * spider_net_probe initializes pdev and registers a net_device
+ * structure for it. After that, the device can be ifconfig'ed up
+ **/
+static int __devinit
+spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int err = -EIO;
+	struct spider_net_card *card;
+
+	card = spider_net_setup_pci_dev(pdev);
+	if (!card)
+		goto out;
+
+	spider_net_workaround_rxramfull(card);
+	spider_net_init_card(card);
+
+	err = spider_net_setup_phy(card);
+	if (err)
+		goto out_undo_pci;
+
+	err = spider_net_setup_netdev(card);
+	if (err)
+		goto out_undo_pci;
+
+	return 0;
+
+out_undo_pci:
+	spider_net_undo_pci_setup(card);
+	free_netdev(card->netdev);
+out:
+	return err;
+}
+
+/**
+ * spider_net_remove - removal of a device
+ * @pdev: PCI device
+ *
+ * Returns 0 on success, <0 on failure
+ *
+ * spider_net_remove is called to remove the device and unregisters the
+ * net_device
+ **/
+static void __devexit
+spider_net_remove(struct pci_dev *pdev)
+{
+	struct net_device *netdev;
+	struct spider_net_card *card;
+
+	netdev = pci_get_drvdata(pdev);
+	card = netdev_priv(netdev);
+
+	wait_event(card->waitq,
+		   atomic_read(&card->tx_timeout_task_counter) == 0);
+
+	unregister_netdev(netdev);
+
+	/* switch off card */
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_STOP_VALUE);
+	spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
+			     SPIDER_NET_CKRCTRL_RUN_VALUE);
+
+	spider_net_undo_pci_setup(card);
+	free_netdev(netdev);
+}
+
+static struct pci_driver spider_net_driver = {
+	.name		= spider_net_driver_name,
+	.id_table	= spider_net_pci_tbl,
+	.probe		= spider_net_probe,
+	.remove		= __devexit_p(spider_net_remove)
+};
+
+/**
+ * spider_net_init - init function when the driver is loaded
+ *
+ * spider_net_init registers the device driver
+ */
+static int __init spider_net_init(void)
+{
+	printk(KERN_INFO "Spidernet version %s.\n", VERSION);
+
+	if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
+		rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
+		pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
+	}
+	if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
+		rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
+		pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
+	}
+	if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
+		tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
+		pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
+	}
+	if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
+		tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
+		pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
+	}
+
+	return pci_register_driver(&spider_net_driver);
+}
+
+/**
+ * spider_net_cleanup - exit function when driver is unloaded
+ *
+ * spider_net_cleanup unregisters the device driver
+ */
+static void __exit spider_net_cleanup(void)
+{
+	pci_unregister_driver(&spider_net_driver);
+}
+
+module_init(spider_net_init);
+module_exit(spider_net_cleanup);