X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fnet%2Fspider_net.c;h=c5c123d3af57f00b5930d7cf318f1a3444f5dcd5;hb=888432f6720bec93ddae93c4d1483a18198a1b3b;hp=b30290d53f79f384db4281fe0fa2741740a08f6c;hpb=1a2509c946bfd4d4a4c5a6e816082d3a7de45db8;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index b30290d..c5c123d 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1,7 +1,8 @@
 /*
- * Network device driver for Cell Processor-Based Blade
+ * 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>
@@ -45,7 +46,7 @@
 #include <linux/vmalloc.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
-#include <asm/bitops.h>
+#include <linux/bitops.h>
 #include <asm/pci-bridge.h>
 #include <net/checksum.h>
 
@@ -55,12 +56,13 @@ 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);
 
 static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
 static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
 
-module_param(rx_descriptors, int, 0644);
-module_param(tx_descriptors, int, 0644);
+module_param(rx_descriptors, int, 0444);
+module_param(tx_descriptors, int, 0444);
 
 MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
 		 "in rx chains");
@@ -84,15 +86,14 @@ MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
  *
  * returns the content of the specified SMMIO register.
  */
-static u32
+static inline u32
 spider_net_read_reg(struct spider_net_card *card, u32 reg)
 {
-	u32 value;
-
-	value = readl(card->regs + reg);
-	value = le32_to_cpu(value);
-
-	return value;
+	/* 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);
 }
 
 /**
@@ -101,11 +102,14 @@ spider_net_read_reg(struct spider_net_card *card, u32 reg)
  * @reg: register to write to
  * @value: value to write into the specified SMMIO register
  */
-static void
+static inline void
 spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
 {
-	value = cpu_to_le32(value);
-	writel(value, card->regs + reg);
+	/* 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
@@ -163,6 +167,39 @@ spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
 }
 
 /**
+ * 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;
+
+	mii_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
  *
@@ -259,39 +296,10 @@ spider_net_get_mac_address(struct net_device *netdev)
  *
  * returns the status as in the dmac_cmd_status field of the descriptor
  */
-static enum spider_net_descr_status
-spider_net_get_descr_status(struct spider_net_descr *descr)
-{
-	u32 cmd_status;
-
-	cmd_status = descr->dmac_cmd_status;
-	cmd_status >>= SPIDER_NET_DESCR_IND_PROC_SHIFT;
-	/* no need to mask out any bits, as cmd_status is 32 bits wide only
-	 * (and unsigned) */
-	return cmd_status;
-}
-
-/**
- * spider_net_set_descr_status -- sets the status of a descriptor
- * @descr: descriptor to change
- * @status: status to set in the descriptor
- *
- * changes the status to the specified value. Doesn't change other bits
- * in the status
- */
-static void
-spider_net_set_descr_status(struct spider_net_descr *descr,
-			    enum spider_net_descr_status status)
+static inline int
+spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
 {
-	u32 cmd_status;
-	/* read the status */
-	cmd_status = descr->dmac_cmd_status;
-	/* clean the upper 4 bits */
-	cmd_status &= SPIDER_NET_DESCR_IND_PROC_MASKO;
-	/* add the status to it */
-	cmd_status |= ((u32)status)<<SPIDER_NET_DESCR_IND_PROC_SHIFT;
-	/* and write it back */
-	descr->dmac_cmd_status = cmd_status;
+	return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
 }
 
 /**
@@ -306,77 +314,70 @@ spider_net_free_chain(struct spider_net_card *card,
 {
 	struct spider_net_descr *descr;
 
-	for (descr = chain->tail; !descr->bus_addr; descr = descr->next) {
-		pci_unmap_single(card->pdev, descr->bus_addr,
-				 SPIDER_NET_DESCR_SIZE, PCI_DMA_BIDIRECTIONAL);
+	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 - links descriptor chain
+ * spider_net_init_chain - alloc and link descriptor chain
  * @card: card structure
  * @chain: address of chain
- * @start_descr: address of descriptor array
- * @no: number of descriptors
  *
- * we manage a circular list that mirrors the hardware structure,
+ * We manage a circular list that mirrors the hardware structure,
  * except that the hardware uses bus addresses.
  *
- * returns 0 on success, <0 on failure
+ * Returns 0 on success, <0 on failure
  */
 static int
 spider_net_init_chain(struct spider_net_card *card,
-		       struct spider_net_descr_chain *chain,
-		       struct spider_net_descr *start_descr, int no)
+		       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;
 
-	atomic_set(&card->rx_chain_refill,0);
+	alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
 
-	descr = start_descr;
-	memset(descr, 0, sizeof(*descr) * no);
+	chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
+		&chain->dma_addr, GFP_KERNEL);
 
-	/* set up the hardware pointers in each descriptor */
-	for (i=0; i<no; i++, descr++) {
-		spider_net_set_descr_status(descr, SPIDER_NET_DESCR_NOT_IN_USE);
+	if (!chain->hwring)
+		return -ENOMEM;
 
-		buf = pci_map_single(card->pdev, descr,
-				     SPIDER_NET_DESCR_SIZE,
-				     PCI_DMA_BIDIRECTIONAL);
+	memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
 
-		if (buf == DMA_ERROR_CODE)
-			goto iommu_error;
+	/* 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 = start_descr;
-	start_descr->prev = descr-1;
-
-	descr = start_descr;
-	for (i=0; i < no; i++, descr++) {
-		descr->next_descr_addr = descr->next->bus_addr;
-	}
-
-	chain->head = start_descr;
-	chain->tail = start_descr;
+	(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;
-
-iommu_error:
-	descr = start_descr;
-	for (i=0; i < no; i++, descr++)
-		if (descr->bus_addr)
-			pci_unmap_single(card->pdev, descr->bus_addr,
-					 SPIDER_NET_DESCR_SIZE,
-					 PCI_DMA_BIDIRECTIONAL);
-	return -ENOMEM;
 }
 
 /**
@@ -391,33 +392,34 @@ spider_net_free_rx_chain_contents(struct spider_net_card *card)
 	struct spider_net_descr *descr;
 
 	descr = card->rx_chain.head;
-	while (descr->next != card->rx_chain.head) {
+	do {
 		if (descr->skb) {
-			dev_kfree_skb(descr->skb);
-			pci_unmap_single(card->pdev, descr->buf_addr,
+			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 - reinitializes a rx descriptor
+ * spider_net_prepare_rx_descr - Reinitialize RX descriptor
  * @card: card structure
  * @descr: descriptor to re-init
  *
- * return 0 on succes, <0 on failure
+ * Return 0 on succes, <0 on failure.
  *
- * allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
- * Activate the descriptor state-wise
+ * 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 error = 0;
 	int offset;
 	int bufsize;
 
@@ -428,36 +430,43 @@ spider_net_prepare_rx_descr(struct spider_net_card *card,
 	/* and we need to have it 128 byte aligned, therefore we allocate a
 	 * bit more */
 	/* allocate an skb */
-	descr->skb = dev_alloc_skb(bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
+	descr->skb = netdev_alloc_skb(card->netdev,
+				      bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
 	if (!descr->skb) {
 		if (netif_msg_rx_err(card) && net_ratelimit())
-			pr_err("Not enough memory to allocate rx buffer\n");
+			dev_err(&card->netdev->dev,
+			        "Not enough memory to allocate rx buffer\n");
+		card->spider_stats.alloc_rx_skb_error++;
 		return -ENOMEM;
 	}
-	descr->buf_size = bufsize;
-	descr->result_size = 0;
-	descr->valid_size = 0;
-	descr->data_status = 0;
-	descr->data_error = 0;
+	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);
-	/* io-mmu-map the skb */
+	/* iommu-map the skb */
 	buf = pci_map_single(card->pdev, descr->skb->data,
-			     SPIDER_NET_MAX_FRAME, PCI_DMA_BIDIRECTIONAL);
-	descr->buf_addr = buf;
-	if (buf == DMA_ERROR_CODE) {
+			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())
-			pr_err("Could not iommu-map rx buffer\n");
-		spider_net_set_descr_status(descr, SPIDER_NET_DESCR_NOT_IN_USE);
+			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 {
-		descr->dmac_cmd_status = SPIDER_NET_DMAC_RX_CARDOWNED;
+		hwdescr->buf_addr = buf;
+		wmb();
+		hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
+					 SPIDER_NET_DMAC_NOINTR_COMPLETE;
 	}
 
-	return error;
+	return 0;
 }
 
 /**
@@ -468,7 +477,7 @@ spider_net_prepare_rx_descr(struct spider_net_card *card,
  * chip by writing to the appropriate register. DMA is enabled in
  * spider_net_enable_rxdmac.
  */
-static void
+static inline void
 spider_net_enable_rxchtails(struct spider_net_card *card)
 {
 	/* assume chain is aligned correctly */
@@ -483,7 +492,7 @@ spider_net_enable_rxchtails(struct spider_net_card *card)
  * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
  * in the GDADMACCNTR register
  */
-static void
+static inline void
 spider_net_enable_rxdmac(struct spider_net_card *card)
 {
 	wmb();
@@ -492,6 +501,20 @@ spider_net_enable_rxdmac(struct spider_net_card *card)
 }
 
 /**
+ * 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
  *
@@ -500,162 +523,62 @@ spider_net_enable_rxdmac(struct spider_net_card *card)
 static void
 spider_net_refill_rx_chain(struct spider_net_card *card)
 {
-	struct spider_net_descr_chain *chain;
-
-	chain = &card->rx_chain;
+	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 (atomic_inc_return(&card->rx_chain_refill) == 1)
-		while (spider_net_get_descr_status(chain->head) ==
-		       SPIDER_NET_DESCR_NOT_IN_USE) {
-			if (spider_net_prepare_rx_descr(card, chain->head))
-				break;
-			chain->head = chain->head->next;
-		}
+	if (!spin_trylock_irqsave(&chain->lock, flags))
+		return;
 
-	atomic_dec(&card->rx_chain_refill);
+	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
+ * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
  * @card: card structure
  *
- * returns 0 on success, <0 on failure
+ * Returns 0 on success, <0 on failure.
  */
 static int
 spider_net_alloc_rx_skbs(struct spider_net_card *card)
 {
-	int result;
-	struct spider_net_descr_chain *chain;
+	struct spider_net_descr_chain *chain = &card->rx_chain;
+	struct spider_net_descr *start = chain->tail;
+	struct spider_net_descr *descr = start;
 
-	result = -ENOMEM;
+	/* Link up the hardware chain pointers */
+	do {
+		descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
+		descr = descr->next;
+	} while (descr != start);
 
-	chain = &card->rx_chain;
-	/* 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 */
+	/* 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 */
+	/* 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 result;
-}
-
-/**
- * spider_net_release_tx_descr - processes a used tx descriptor
- * @card: card structure
- * @descr: descriptor to release
- *
- * releases a used tx descriptor (unmapping, freeing of skb)
- */
-static void
-spider_net_release_tx_descr(struct spider_net_card *card,
-			    struct spider_net_descr *descr)
-{
-	struct sk_buff *skb;
-
-	/* unmap the skb */
-	skb = descr->skb;
-	pci_unmap_single(card->pdev, descr->buf_addr, skb->len,
-			 PCI_DMA_BIDIRECTIONAL);
-
-	dev_kfree_skb_any(skb);
-
-	/* set status to not used */
-	spider_net_set_descr_status(descr, SPIDER_NET_DESCR_NOT_IN_USE);
-}
-
-/**
- * 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 loose initiative.
- */
-static int
-spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
-{
-	struct spider_net_descr_chain *tx_chain = &card->tx_chain;
-	enum spider_net_descr_status status;
-
-	if (atomic_inc_return(&card->tx_chain_release) != 1) {
-		atomic_dec(&card->tx_chain_release);
-		return 1;
-	}
-
-	for (;;) {
-		status = spider_net_get_descr_status(tx_chain->tail);
-		switch (status) {
-		case SPIDER_NET_DESCR_CARDOWNED:
-			if (!brutal)
-				goto out;
-			/* 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))
-				pr_err("%s: forcing end of tx descriptor "
-				       "with status x%02x\n",
-				       card->netdev->name, status);
-			card->netdev_stats.tx_dropped++;
-			break;
-
-		case SPIDER_NET_DESCR_COMPLETE:
-			card->netdev_stats.tx_packets++;
-			card->netdev_stats.tx_bytes +=
-				tx_chain->tail->skb->len;
-			break;
-
-		default: /* any other value (== SPIDER_NET_DESCR_NOT_IN_USE) */
-			goto out;
-		}
-		spider_net_release_tx_descr(card, tx_chain->tail);
-		tx_chain->tail = tx_chain->tail->next;
-	}
-out:
-	atomic_dec(&card->tx_chain_release);
-
-	netif_wake_queue(card->netdev);
-
-	if (status == SPIDER_NET_DESCR_CARDOWNED)
-		return 1;
-	return 0;
-}
-
-/**
- * spider_net_cleanup_tx_ring - cleans up the TX ring
- * @card: card structure
- *
- * spider_net_cleanup_tx_ring is called by the tx_timer (as we don't use
- * interrupts to cleanup our TX ring) and returns sent packets to the stack
- * by freeing them
- */
-static void
-spider_net_cleanup_tx_ring(struct spider_net_card *card)
-{
-	if ( (spider_net_release_tx_chain(card, 0)) &&
-	      (card->netdev->flags & IFF_UP) ) {
-		mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
-	}
+	return -ENOMEM;
 }
 
 /**
@@ -747,167 +670,236 @@ write_hash:
 }
 
 /**
- * spider_net_disable_rxdmac - disables the receive DMA controller
+ * spider_net_prepare_tx_descr - fill tx descriptor with skb data
  * @card: card structure
+ * @skb: packet to use
  *
- * spider_net_disable_rxdmac terminates processing on the DMA controller by
- * turing off DMA and issueing a force end
- */
-static 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_stop - called upon ifconfig down
- * @netdev: interface device structure
+ * returns 0 on success, <0 on failure.
  *
- * always returns 0
+ * fills out the descriptor structure with skb data and len. Copies data,
+ * if needed (32bit DMA!)
  */
-int
-spider_net_stop(struct net_device *netdev)
+static int
+spider_net_prepare_tx_descr(struct spider_net_card *card,
+			    struct sk_buff *skb)
 {
-	struct spider_net_card *card = netdev_priv(netdev);
-
-	tasklet_kill(&card->rxram_full_tl);
-	netif_poll_disable(netdev);
-	netif_carrier_off(netdev);
-	netif_stop_queue(netdev);
-	del_timer_sync(&card->tx_timer);
-
-	/* disable/mask all interrupts */
-	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);
-
-	/* free_irq(netdev->irq, netdev);*/
-	free_irq(to_pci_dev(netdev->class_dev.dev)->irq, netdev);
+	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;
 
-	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
-			     SPIDER_NET_DMA_TX_FEND_VALUE);
+	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;
+	}
 
-	/* turn off DMA, force end */
-	spider_net_disable_rxdmac(card);
+	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;
 
-	/* release chains */
-	spider_net_release_tx_chain(card, 1);
+	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;
+		}
 
-	spider_net_free_chain(card, &card->tx_chain);
-	spider_net_free_chain(card, &card->rx_chain);
+	/* 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;
 }
 
-/**
- * spider_net_get_next_tx_descr - returns the next available tx descriptor
- * @card: device structure to get descriptor from
- *
- * returns the address of the next descriptor, or NULL if not available.
- */
-static struct spider_net_descr *
-spider_net_get_next_tx_descr(struct spider_net_card *card)
+static int
+spider_net_set_low_watermark(struct spider_net_card *card)
 {
-	/* check, if head points to not-in-use descr */
-	if ( spider_net_get_descr_status(card->tx_chain.head) ==
-	     SPIDER_NET_DESCR_NOT_IN_USE ) {
-		return card->tx_chain.head;
-	} else {
-		return NULL;
+	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++;
 	}
-}
 
-/**
- * spider_net_set_txdescr_cmdstat - sets the tx descriptor command field
- * @descr: descriptor structure to fill out
- * @skb: packet to consider
- *
- * fills out the command and status field of the descriptor structure,
- * depending on hardware checksum settings.
- */
-static void
-spider_net_set_txdescr_cmdstat(struct spider_net_descr *descr,
-			       struct sk_buff *skb)
-{
-	/* make sure the other fields in the descriptor are written */
-	wmb();
+	/* If TX queue is short, don't even bother with interrupts */
+	if (cnt < card->tx_chain.num_desc/4)
+		return cnt;
 
-	if (skb->ip_summed != CHECKSUM_HW) {
-		descr->dmac_cmd_status = SPIDER_NET_DMAC_CMDSTAT_NOCS;
-		return;
-	}
+	/* 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;
 
-	/* is packet ip?
-	 * if yes: tcp? udp? */
-	if (skb->protocol == htons(ETH_P_IP)) {
-		if (skb->nh.iph->protocol == IPPROTO_TCP)
-			descr->dmac_cmd_status = SPIDER_NET_DMAC_CMDSTAT_TCPCS;
-		else if (skb->nh.iph->protocol == IPPROTO_UDP)
-			descr->dmac_cmd_status = SPIDER_NET_DMAC_CMDSTAT_UDPCS;
-		else /* the stack should checksum non-tcp and non-udp
-			packets on his own: NETIF_F_IP_CSUM */
-			descr->dmac_cmd_status = SPIDER_NET_DMAC_CMDSTAT_NOCS;
+	/* 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_prepare_tx_descr - fill tx descriptor with skb data
- * @card: card structure
- * @descr: descriptor structure to fill out
- * @skb: packet to use
+ * 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 on success, <0 on failure.
+ * returns 0 if the tx ring is empty, otherwise 1.
  *
- * fills out the descriptor structure with skb data and len. Copies data,
- * if needed (32bit DMA!)
+ * 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_prepare_tx_descr(struct spider_net_card *card,
-			    struct spider_net_descr *descr,
-			    struct sk_buff *skb)
+spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
 {
-	dma_addr_t buf;
+	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;
 
-	buf = pci_map_single(card->pdev, skb->data,
-			     skb->len, PCI_DMA_BIDIRECTIONAL);
-	if (buf == DMA_ERROR_CODE) {
-		if (netif_msg_tx_err(card) && net_ratelimit())
-			pr_err("could not iommu-map packet (%p, %i). "
-				  "Dropping packet\n", skb->data, skb->len);
-		return -ENOMEM;
-	}
+		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;
 
-	descr->buf_addr = buf;
-	descr->buf_size = skb->len;
-	descr->skb = skb;
-	descr->data_status = 0;
+		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) */
 
-	spider_net_set_txdescr_cmdstat(descr,skb);
+		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
- * @descr: descriptor address to enable TX processing at
  *
- * spider_net_kick_tx_dma writes the current tx chain head as start address
- * of the tx descriptor chain and enables the transmission DMA engine
+ * 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 void
-spider_net_kick_tx_dma(struct spider_net_card *card,
-		       struct spider_net_descr *descr)
+static inline void
+spider_net_kick_tx_dma(struct spider_net_card *card)
 {
-	/* this is the only descriptor in the output chain.
-	 * Enable TX DMA */
+	struct spider_net_descr *descr;
 
-	spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
-			     descr->bus_addr);
+	if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
+			SPIDER_NET_TX_DMA_EN)
+		goto out;
 
-	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
-			     SPIDER_NET_DMA_TX_VALUE);
+	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);
 }
 
 /**
@@ -915,47 +907,45 @@ spider_net_kick_tx_dma(struct spider_net_card *card,
  * @skb: packet to send out
  * @netdev: interface device structure
  *
- * returns 0 on success, <0 on failure
+ * 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);
-	struct spider_net_descr *descr;
-	int result;
 
 	spider_net_release_tx_chain(card, 0);
 
-	descr = spider_net_get_next_tx_descr(card);
-
-	if (!descr)
-		goto error;
-
-	result = spider_net_prepare_tx_descr(card, descr, skb);
-	if (result)
-		goto error;
-
-	card->tx_chain.head = card->tx_chain.head->next;
-
-	if (spider_net_get_descr_status(descr->prev) !=
-	    SPIDER_NET_DESCR_CARDOWNED) {
-		/* make sure the current descriptor is in memory. Then
-		 * kicking it on again makes sense, if the previous is not
-		 * card-owned anymore. Check the previous descriptor twice
-		 * to omit an mb() in heavy traffic cases */
-		mb();
-		if (spider_net_get_descr_status(descr->prev) !=
-		    SPIDER_NET_DESCR_CARDOWNED)
-			spider_net_kick_tx_dma(card, descr);
+	if (spider_net_prepare_tx_descr(card, skb) != 0) {
+		netdev->stats.tx_dropped++;
+		netif_stop_queue(netdev);
+		return NETDEV_TX_BUSY;
 	}
 
-	mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
-
+	cnt = spider_net_set_low_watermark(card);
+	if (cnt < 5)
+		spider_net_kick_tx_dma(card);
 	return NETDEV_TX_OK;
+}
 
-error:
-	card->netdev_stats.tx_dropped++;
-	return NETDEV_TX_BUSY;
+/**
+ * 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);
+	}
 }
 
 /**
@@ -980,42 +970,21 @@ spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
  * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
  * @descr: descriptor to process
  * @card: card structure
- * @napi: whether caller is in NAPI context
  *
- * returns 1 on success, 0 if no packet was passed to the stack
- *
- * iommu-unmaps the skb, fills out skb structure and passes the data to the
- * stack. The descriptor state is not changed.
+ * Fills out skb structure and passes the data to the stack.
+ * The descriptor state is not changed.
  */
-static int
+static void
 spider_net_pass_skb_up(struct spider_net_descr *descr,
-		       struct spider_net_card *card, int napi)
+		       struct spider_net_card *card)
 {
-	struct sk_buff *skb;
-	struct net_device *netdev;
-	u32 data_status, data_error;
-
-	data_status = descr->data_status;
-	data_error = descr->data_error;
-
-	netdev = card->netdev;
-
-	/* unmap descriptor */
-	pci_unmap_single(card->pdev, descr->buf_addr, SPIDER_NET_MAX_FRAME,
-			 PCI_DMA_BIDIRECTIONAL);
-
-	/* the cases we'll throw away the packet immediately */
-	if (data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
-		if (netif_msg_rx_err(card))
-			pr_err("error in received descriptor found, "
-			       "data_status=x%08x, data_error=x%08x\n",
-			       data_status, data_error);
-		return 0;
-	}
+	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 = descr->skb;
-	skb->dev = netdev;
-	skb_put(skb, descr->valid_size);
+	skb_put(skb, hwdescr->valid_size);
 
 	/* the card seems to add 2 bytes of junk in front
 	 * of the ethernet frame */
@@ -1040,91 +1009,257 @@ spider_net_pass_skb_up(struct spider_net_descr *descr,
 		 */
 	}
 
+	/* update netdevice statistics */
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += skb->len;
+
 	/* pass skb up to stack */
-	if (napi)
-		netif_receive_skb(skb);
-	else
-		netif_rx_ni(skb);
+	netif_receive_skb(skb);
+}
 
-	/* update netdevice statistics */
-	card->netdev_stats.rx_packets++;
-	card->netdev_stats.rx_bytes += skb->len;
+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
 
-	return 1;
 }
 
 /**
- * spider_net_decode_one_descr - processes an rx descriptor
- * @card: card structure
- * @napi: whether caller is in NAPI context
- *
- * returns 1 if a packet has been sent to the stack, otherwise 0
+ * spider_net_resync_head_ptr - Advance head ptr past empty descrs
  *
- * 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
+ * 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 int
-spider_net_decode_one_descr(struct spider_net_card *card, int napi)
+static void spider_net_resync_head_ptr(struct spider_net_card *card)
 {
-	enum spider_net_descr_status status;
+	unsigned long flags;
+	struct spider_net_descr_chain *chain = &card->rx_chain;
 	struct spider_net_descr *descr;
-	struct spider_net_descr_chain *chain;
-	int result;
+	int i, status;
 
-	chain = &card->rx_chain;
-	descr = chain->tail;
+	/* Advance head pointer past any empty descrs */
+	descr = chain->head;
+	status = spider_net_get_descr_status(descr->hwdescr);
 
-	status = spider_net_get_descr_status(descr);
+	if (status == SPIDER_NET_DESCR_NOT_IN_USE)
+		return;
 
-	if (status == SPIDER_NET_DESCR_CARDOWNED) {
-		/* nothing in the descriptor yet */
-		result=0;
-		goto out;
+	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;
 
-	if (status == SPIDER_NET_DESCR_NOT_IN_USE) {
-		/* not initialized yet, the ring must be empty */
-		spider_net_refill_rx_chain(card);
-		spider_net_enable_rxdmac(card);
-		result=0;
-		goto out;
+	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;
 
-	result = 0;
+	/* 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))
-			pr_err("%s: dropping RX descriptor with state %d\n",
-			       card->netdev->name, status);
-		card->netdev_stats.rx_dropped++;
-		pci_unmap_single(card->pdev, descr->buf_addr,
-				 SPIDER_NET_MAX_FRAME, PCI_DMA_BIDIRECTIONAL);
-		dev_kfree_skb_irq(descr->skb);
-		goto refill;
+			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))
-			pr_err("%s: RX descriptor with state %d\n",
-			       card->netdev->name, status);
-		goto refill;
+			dev_err(&card->netdev->dev,
+			       "RX descriptor with unknown state %d\n", status);
+		card->spider_stats.rx_desc_unk_state++;
+		goto bad_desc;
 	}
 
-	/* ok, we've got a packet in descr */
-	result = spider_net_pass_skb_up(descr, card, napi);
-refill:
-	spider_net_set_descr_status(descr, SPIDER_NET_DESCR_NOT_IN_USE);
-	/* change the descriptor state: */
-	if (!napi)
-		spider_net_refill_rx_chain(card);
-out:
-	return result;
+	/* 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;
 }
 
 /**
@@ -1139,90 +1274,40 @@ out:
  * (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 net_device *netdev, int *budget)
+static int spider_net_poll(struct napi_struct *napi, int budget)
 {
-	struct spider_net_card *card = netdev_priv(netdev);
-	int packets_to_do, packets_done = 0;
-	int no_more_packets = 0;
-
-	packets_to_do = min(*budget, netdev->quota);
-
-	while (packets_to_do) {
-		if (spider_net_decode_one_descr(card, 1)) {
-			packets_done++;
-			packets_to_do--;
-		} else {
-			/* no more packets for the stack */
-			no_more_packets = 1;
+	struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
+	struct net_device *netdev = card->netdev;
+	int packets_done = 0;
+
+	while (packets_done < budget) {
+		if (!spider_net_decode_one_descr(card))
 			break;
-		}
+
+		packets_done++;
 	}
 
-	netdev->quota -= packets_done;
-	*budget -= 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 (no_more_packets) {
-		netif_rx_complete(netdev);
+	if (packets_done < budget) {
+		netif_rx_complete(napi);
 		spider_net_rx_irq_on(card);
-		return 0;
+		card->ignore_rx_ramfull = 0;
 	}
 
-	return 1;
-}
-
-/**
- * spider_net_vlan_rx_reg - initializes VLAN structures in the driver and card
- * @netdev: interface device structure
- * @grp: vlan_group structure that is registered (NULL on destroying interface)
- */
-static void
-spider_net_vlan_rx_reg(struct net_device *netdev, struct vlan_group *grp)
-{
-	/* further enhancement... yet to do */
-	return;
-}
-
-/**
- * spider_net_vlan_rx_add - adds VLAN id to the card filter
- * @netdev: interface device structure
- * @vid: VLAN id to add
- */
-static void
-spider_net_vlan_rx_add(struct net_device *netdev, uint16_t vid)
-{
-	/* further enhancement... yet to do */
-	/* add vid to card's VLAN filter table */
-	return;
-}
-
-/**
- * spider_net_vlan_rx_kill - removes VLAN id to the card filter
- * @netdev: interface device structure
- * @vid: VLAN id to remove
- */
-static void
-spider_net_vlan_rx_kill(struct net_device *netdev, uint16_t vid)
-{
-	/* further enhancement... yet to do */
-	/* remove vid from card's VLAN filter table */
-}
-
-/**
- * spider_net_get_stats - get interface statistics
- * @netdev: interface device structure
- *
- * returns the interface statistics residing in the spider_net_card struct
- */
-static struct net_device_stats *
-spider_net_get_stats(struct net_device *netdev)
-{
-	struct spider_net_card *card = netdev_priv(netdev);
-	struct net_device_stats *stats = &card->netdev_stats;
-	return stats;
+	return packets_done;
 }
 
 /**
@@ -1291,36 +1376,32 @@ spider_net_set_mac(struct net_device *netdev, void *p)
 }
 
 /**
- * spider_net_enable_txdmac - enables a TX DMA controller
- * @card: card structure
+ * spider_net_link_reset
+ * @netdev: net device structure
  *
- * spider_net_enable_txdmac enables the TX DMA controller by setting the
- * descriptor chain tail address
- */
-static void
-spider_net_enable_txdmac(struct spider_net_card *card)
-{
-	/* assume chain is aligned correctly */
-	spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
-			     card->tx_chain.tail->bus_addr);
-}
-
-/**
- * spider_net_handle_rxram_full - cleans up RX ring upon RX RAM full interrupt
- * @card: card structure
+ * This is called when the PHY_LINK signal is asserted. For the blade this is
+ * not connected so we should never get here.
  *
- * spider_net_handle_rxram_full empties the RX ring so that spider can put
- * more packets in it and empty its RX RAM. This is called in bottom half
- * context
  */
 static void
-spider_net_handle_rxram_full(struct spider_net_card *card)
+spider_net_link_reset(struct net_device *netdev)
 {
-	while (spider_net_decode_one_descr(card, 0))
-		;
-	spider_net_enable_rxchtails(card);
-	spider_net_enable_rxdmac(card);
-	netif_rx_schedule(card->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);
+
 }
 
 /**
@@ -1332,15 +1413,12 @@ spider_net_handle_rxram_full(struct spider_net_card *card)
  * found when an interrupt is presented
  */
 static void
-spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
+spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
+			    u32 error_reg1, u32 error_reg2)
 {
-	u32 error_reg1, error_reg2;
 	u32 i;
 	int show_error = 1;
 
-	error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
-	error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
-
 	/* check GHIINT0STS ************************************/
 	if (status_reg)
 		for (i = 0; i < 32; i++)
@@ -1351,12 +1429,15 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	case SPIDER_NET_PHYINT:
 	case SPIDER_NET_GMAC2INT:
 	case SPIDER_NET_GMAC1INT:
-	case SPIDER_NET_GIPSINT:
 	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;
@@ -1371,7 +1452,7 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	case SPIDER_NET_GPWFFINT:
 		/* PHY command queue full */
 		if (netif_msg_intr(card))
-			pr_err("PHY write queue full\n");
+			dev_err(&card->netdev->dev, "PHY write queue full\n");
 		show_error = 0;
 		break;
 
@@ -1415,9 +1496,10 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	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)
+		if (card->tx_chain.tail != card->tx_chain.head)
 			spider_net_kick_tx_dma(card);
-		show_error = 0; */
+		*/
+		show_error = 0;
 		break;
 
 	/* case SPIDER_NET_G1TMCNTINT: not used. print a message */
@@ -1431,8 +1513,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 				switch (i)
 	{
 	case SPIDER_NET_GTMFLLINT:
-		if (netif_msg_intr(card) && net_ratelimit())
-			pr_err("Spider TX RAM full\n");
+		/* TX RAM full may happen on a usual case.
+		 * Logging is not needed. */
 		show_error = 0;
 		break;
 	case SPIDER_NET_GRFDFLLINT: /* fallthrough */
@@ -1440,11 +1522,15 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	case SPIDER_NET_GRFBFLLINT: /* fallthrough */
 	case SPIDER_NET_GRFAFLLINT: /* fallthrough */
 	case SPIDER_NET_GRMFLLINT:
-		if (netif_msg_intr(card) && net_ratelimit())
-			pr_debug("Spider RX RAM full, incoming packets "
-			       "might be discarded!\n");
-		spider_net_rx_irq_off(card);
-		tasklet_schedule(&card->rxram_full_tl);
+		/* 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 ++;
+			netif_rx_schedule(&card->napi);
+		}
 		show_error = 0;
 		break;
 
@@ -1459,12 +1545,11 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	case SPIDER_NET_GDCDCEINT: /* fallthrough */
 	case SPIDER_NET_GDBDCEINT: /* fallthrough */
 	case SPIDER_NET_GDADCEINT:
-		if (netif_msg_intr(card))
-			pr_err("got descriptor chain end interrupt, "
-			       "restarting DMAC %c.\n",
-			       'D'+i-SPIDER_NET_GDDDCEINT);
+		spider_net_resync_head_ptr(card);
 		spider_net_refill_rx_chain(card);
 		spider_net_enable_rxdmac(card);
+		card->num_rx_ints ++;
+		netif_rx_schedule(&card->napi);
 		show_error = 0;
 		break;
 
@@ -1473,9 +1558,12 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 	case SPIDER_NET_GDCINVDINT: /* fallthrough */
 	case SPIDER_NET_GDBINVDINT: /* fallthrough */
 	case SPIDER_NET_GDAINVDINT:
-		/* could happen when rx chain is full */
+		/* 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 ++;
+		netif_rx_schedule(&card->napi);
 		show_error = 0;
 		break;
 
@@ -1530,8 +1618,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 			break;
 	}
 
-	if ((show_error) && (netif_msg_intr(card)))
-		pr_err("Got error interrupt, GHIINT0STS = 0x%08x, "
+	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);
 
@@ -1542,9 +1630,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
 
 /**
  * spider_net_interrupt - interrupt handler for spider_net
- * @irq: interupt number
+ * @irq: interrupt number
  * @ptr: pointer to net_device
- * @regs: PU registers
  *
  * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
  * interrupt found raised by card.
@@ -1553,24 +1640,35 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
  * interrupts for this device and makes the stack poll the driver
  */
 static irqreturn_t
-spider_net_interrupt(int irq, void *ptr, struct pt_regs *regs)
+spider_net_interrupt(int irq, void *ptr)
 {
 	struct net_device *netdev = ptr;
 	struct spider_net_card *card = netdev_priv(netdev);
-	u32 status_reg;
+	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)
+	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);
-		netif_rx_schedule(netdev);
+		netif_rx_schedule(&card->napi);
+		card->num_rx_ints ++;
 	}
+	if (status_reg & SPIDER_NET_TXINT)
+		netif_rx_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);
+		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);
@@ -1578,21 +1676,53 @@ spider_net_interrupt(int irq, void *ptr, struct pt_regs *regs)
 	return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_NET_POLL_CONTROLLER
+#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_poll_controller - artificial interrupt for netconsole etc.
- * @netdev: interface device structure
+ * spider_net_disable_interrupts - disable interrupts
+ * @card: card structure
  *
- * see Documentation/networking/netconsole.txt
+ * spider_net_disable_interrupts disables all the interrupts
  */
 static void
-spider_net_poll_controller(struct net_device *netdev)
+spider_net_disable_interrupts(struct spider_net_card *card)
 {
-	disable_irq(netdev->irq);
-	spider_net_interrupt(netdev->irq, netdev, NULL);
-	enable_irq(netdev->irq);
+	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);
 }
-#endif /* CONFIG_NET_POLL_CONTROLLER */
 
 /**
  * spider_net_init_card - initializes the card
@@ -1609,6 +1739,12 @@ spider_net_init_card(struct spider_net_card *card)
 
 	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);
 }
 
 /**
@@ -1653,7 +1789,6 @@ spider_net_enable_card(struct spider_net_card *card)
 		{ SPIDER_NET_GMRWOLCTRL, 0 },
 		{ SPIDER_NET_GTESTMD, 0x10000000 },
 		{ SPIDER_NET_GTTQMSK, 0x00400040 },
-		{ SPIDER_NET_GTESTMD, 0 },
 
 		{ SPIDER_NET_GMACINTEN, 0 },
 
@@ -1692,114 +1827,13 @@ spider_net_enable_card(struct spider_net_card *card)
 
 	spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
 
-	/* set chain tail adress for TX chain */
-	spider_net_enable_txdmac(card);
-
 	spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
 			     SPIDER_NET_LENLMT_VALUE);
-	spider_net_write_reg(card, SPIDER_NET_GMACMODE,
-			     SPIDER_NET_MACMODE_VALUE);
 	spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
 			     SPIDER_NET_OPMODE_VALUE);
 
-	/* set interrupt mask registers */
-	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_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 = -ENOMEM;
-	if (spider_net_init_chain(card, &card->tx_chain,
-			  card->descr, tx_descriptors))
-		goto alloc_tx_failed;
-	if (spider_net_init_chain(card, &card->rx_chain,
-			  card->descr + tx_descriptors, rx_descriptors))
-		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);
-	netif_poll_enable(netdev);
-
-	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:
-	return result;
-}
-
-/**
- * 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. Sets
- * the PHY to 1000 Mbps
- **/
-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->mii_id = 1;
-	phy->dev = card->netdev;
-	phy->mdio_read = spider_net_read_phy;
-	phy->mdio_write = spider_net_write_phy;
-
-	mii_phy_probe(phy, phy->mii_id);
-
-	if (phy->def->ops->setup_forced)
-		phy->def->ops->setup_forced(phy, SPEED_1000, DUPLEX_FULL);
-
-	phy->def->ops->enable_fiber(phy);
-
-	phy->def->ops->read_link(phy);
-	pr_info("Found %s with %i Mbps, %s-duplex.\n", phy->def->name,
-		phy->speed, phy->duplex==1 ? "Full" : "Half");
-
-	return 0;
+	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
+			     SPIDER_NET_GDTBSTA);
 }
 
 /**
@@ -1880,7 +1914,8 @@ spider_net_init_firmware(struct spider_net_card *card)
 			     SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
 		if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
 		     netif_msg_probe(card) ) {
-			pr_err("Incorrect size of spidernet firmware in " \
+			dev_err(&card->netdev->dev,
+			       "Incorrect size of spidernet firmware in " \
 			       "filesystem. Looking in host firmware...\n");
 			goto try_host_fw;
 		}
@@ -1898,14 +1933,14 @@ try_host_fw:
 	if (!dn)
 		goto out_err;
 
-	fw_prop = get_property(dn, "firmware", &fw_size);
+	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) ) {
-		pr_err("Incorrect size of spidernet firmware in " \
-		       "host firmware\n");
+		dev_err(&card->netdev->dev,
+		       "Incorrect size of spidernet firmware in host firmware\n");
 		goto done;
 	}
 
@@ -1915,12 +1950,192 @@ done:
 	return err;
 out_err:
 	if (netif_msg_probe(card))
-		pr_err("Couldn't find spidernet firmware in filesystem " \
+		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 ");
+
+	return;
+}
+
+/**
+ * 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 (!mii_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
  *
@@ -1938,7 +2153,7 @@ spider_net_workaround_rxramfull(struct spider_net_card *card)
 	/* empty sequencer data */
 	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
 	     sequencer++) {
-		spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
+		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 +
@@ -1955,6 +2170,43 @@ spider_net_workaround_rxramfull(struct spider_net_card *card)
 }
 
 /**
+ * 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
@@ -1962,10 +2214,11 @@ spider_net_workaround_rxramfull(struct spider_net_card *card)
  * called as task when tx hangs, resets interface (if interface is up)
  */
 static void
-spider_net_tx_timeout_task(void *data)
+spider_net_tx_timeout_task(struct work_struct *work)
 {
-	struct net_device *netdev = data;
-	struct spider_net_card *card = netdev_priv(netdev);
+	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;
@@ -1978,11 +2231,9 @@ spider_net_tx_timeout_task(void *data)
 
 	if (spider_net_setup_phy(card))
 		goto out;
-	if (spider_net_init_firmware(card))
-		goto out;
 
 	spider_net_open(netdev);
-	spider_net_kick_tx_dma(card, card->tx_chain.head);
+	spider_net_kick_tx_dma(card);
 	netif_device_attach(netdev);
 
 out:
@@ -2006,6 +2257,7 @@ spider_net_tx_timeout(struct net_device *netdev)
 		schedule_work(&card->tx_timeout_task);
 	else
 		atomic_dec(&card->tx_timeout_task_counter);
+	card->spider_stats.tx_timeouts++;
 }
 
 /**
@@ -2020,7 +2272,6 @@ spider_net_setup_netdev_ops(struct net_device *netdev)
 	netdev->open = &spider_net_open;
 	netdev->stop = &spider_net_stop;
 	netdev->hard_start_xmit = &spider_net_xmit;
-	netdev->get_stats = &spider_net_get_stats;
 	netdev->set_multicast_list = &spider_net_set_multi;
 	netdev->set_mac_address = &spider_net_set_mac;
 	netdev->change_mtu = &spider_net_change_mtu;
@@ -2028,13 +2279,7 @@ spider_net_setup_netdev_ops(struct net_device *netdev)
 	/* tx watchdog */
 	netdev->tx_timeout = &spider_net_tx_timeout;
 	netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
-	/* NAPI */
-	netdev->poll = &spider_net_poll;
-	netdev->weight = SPIDER_NET_NAPI_WEIGHT;
 	/* HW VLAN */
-	netdev->vlan_rx_register = &spider_net_vlan_rx_reg;
-	netdev->vlan_rx_add_vid = &spider_net_vlan_rx_add;
-	netdev->vlan_rx_kill_vid = &spider_net_vlan_rx_kill;
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	/* poll controller */
 	netdev->poll_controller = &spider_net_poll_controller;
@@ -2060,49 +2305,55 @@ spider_net_setup_netdev(struct spider_net_card *card)
 	struct sockaddr addr;
 	const u8 *mac;
 
-	SET_MODULE_OWNER(netdev);
 	SET_NETDEV_DEV(netdev, &card->pdev->dev);
 
 	pci_set_drvdata(card->pdev, netdev);
 
-	atomic_set(&card->tx_chain_release,0);
-	card->rxram_full_tl.data = (unsigned long) card;
-	card->rxram_full_tl.func =
-		(void (*)(unsigned long)) spider_net_handle_rxram_full;
 	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;
+
 	card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;
 
+	netif_napi_add(netdev, &card->napi,
+		       spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
+
 	spider_net_setup_netdev_ops(netdev);
 
-	netdev->features = NETIF_F_HW_CSUM;
+	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 = get_property(dn, "local-mac-address", NULL);
+	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)))
-		pr_err("Failed to set MAC address: %i\n", result);
+		dev_err(&card->netdev->dev,
+		        "Failed to set MAC address: %i\n", result);
 
 	result = register_netdev(netdev);
 	if (result) {
 		if (netif_msg_probe(card))
-			pr_err("Couldn't register net_device: %i\n",
-				  result);
+			dev_err(&card->netdev->dev,
+			        "Couldn't register net_device: %i\n", result);
 		return result;
 	}
 
@@ -2126,9 +2377,8 @@ spider_net_alloc_card(void)
 	struct spider_net_card *card;
 	size_t alloc_size;
 
-	alloc_size = sizeof (*card) +
-		sizeof (struct spider_net_descr) * rx_descriptors +
-		sizeof (struct spider_net_descr) * tx_descriptors;
+	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;
@@ -2136,10 +2386,15 @@ spider_net_alloc_card(void)
 	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, netdev);
+	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;
 }
 
@@ -2158,7 +2413,6 @@ spider_net_undo_pci_setup(struct spider_net_card *card)
 
 /**
  * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
- * @card: card structure
  * @pdev: PCI device
  *
  * Returns the card structure or NULL if any errors occur
@@ -2176,17 +2430,19 @@ spider_net_setup_pci_dev(struct pci_dev *pdev)
 	unsigned long mmio_start, mmio_len;
 
 	if (pci_enable_device(pdev)) {
-		pr_err("Couldn't enable PCI device\n");
+		dev_err(&pdev->dev, "Couldn't enable PCI device\n");
 		return NULL;
 	}
 
 	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
-		pr_err("Couldn't find proper PCI device base address.\n");
+		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)) {
-		pr_err("Couldn't obtain PCI resources, aborting.\n");
+		dev_err(&pdev->dev,
+		        "Couldn't obtain PCI resources, aborting.\n");
 		goto out_disable_dev;
 	}
 
@@ -2194,8 +2450,8 @@ spider_net_setup_pci_dev(struct pci_dev *pdev)
 
 	card = spider_net_alloc_card();
 	if (!card) {
-		pr_err("Couldn't allocate net_device structure, "
-			  "aborting.\n");
+		dev_err(&pdev->dev,
+		        "Couldn't allocate net_device structure, aborting.\n");
 		goto out_release_regions;
 	}
 	card->pdev = pdev;
@@ -2209,7 +2465,8 @@ spider_net_setup_pci_dev(struct pci_dev *pdev)
 	card->regs = ioremap(mmio_start, mmio_len);
 
 	if (!card->regs) {
-		pr_err("Couldn't obtain PCI resources, aborting.\n");
+		dev_err(&pdev->dev,
+		        "Couldn't obtain PCI resources, aborting.\n");
 		goto out_release_regions;
 	}
 
@@ -2250,10 +2507,6 @@ spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		goto out_undo_pci;
 
-	err = spider_net_init_firmware(card);
-	if (err)
-		goto out_undo_pci;
-
 	err = spider_net_setup_netdev(card);
 	if (err)
 		goto out_undo_pci;
@@ -2314,6 +2567,8 @@ static struct pci_driver spider_net_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);