spider_net.c 61.3 KB
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/*
 * Network device driver for Cell Processor-Based Blade
 *
 * (C) Copyright IBM Corp. 2005
 *
 * 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>
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#include <linux/in.h>
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#include <linux/init.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/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
#include <linux/workqueue.h>
#include <asm/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");
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MODULE_VERSION(VERSION);
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static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;

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module_param(rx_descriptors, int, 0444);
module_param(tx_descriptors, int, 0444);
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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 struct pci_device_id 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.
 */
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static inline u32
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spider_net_read_reg(struct spider_net_card *card, u32 reg)
{
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	/* 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);
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}

/**
 * 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
 */
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static inline void
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spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
{
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	/* 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);
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}

/** 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;
}

/**
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 * spider_net_rx_irq_off - switch off rx irq on this spider card
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 * @card: device structure
 *
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 * switches off rx irq by masking them out in the GHIINTnMSK register
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 */
static void
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spider_net_rx_irq_off(struct spider_net_card *card)
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{
	u32 regvalue;

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	regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
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}

/**
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 * spider_net_rx_irq_on - switch on rx irq on this spider card
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 * @card: device structure
 *
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 * switches on rx irq by enabling them in the GHIINTnMSK register
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 */
static void
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spider_net_rx_irq_on(struct spider_net_card *card)
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{
	u32 regvalue;

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	regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
	spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
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}

/**
 * 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
 */
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static inline int
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spider_net_get_descr_status(struct spider_net_descr *descr)
{
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	return descr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
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}

/**
 * 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;

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	descr = chain->ring;
	do {
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		descr->bus_addr = 0;
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		descr->next_descr_addr = 0;
		descr = descr->next;
	} while (descr != chain->ring);

	dma_free_coherent(&card->pdev->dev, chain->num_desc,
	    chain->ring, chain->dma_addr);
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}

/**
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 * spider_net_init_chain - alloc and link descriptor chain
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 * @card: card structure
 * @chain: address of chain
 *
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 * We manage a circular list that mirrors the hardware structure,
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 * except that the hardware uses bus addresses.
 *
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 * Returns 0 on success, <0 on failure
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 */
static int
spider_net_init_chain(struct spider_net_card *card,
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		       struct spider_net_descr_chain *chain)
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{
	int i;
	struct spider_net_descr *descr;
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	dma_addr_t buf;
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	size_t alloc_size;
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	alloc_size = chain->num_desc * sizeof (struct spider_net_descr);
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	chain->ring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
		&chain->dma_addr, GFP_KERNEL);
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	if (!chain->ring)
		return -ENOMEM;
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	descr = chain->ring;
	memset(descr, 0, alloc_size);

	/* Set up the hardware pointers in each descriptor */
	buf = chain->dma_addr;
	for (i=0; i < chain->num_desc; i++, descr++) {
		descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
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		descr->bus_addr = buf;
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		descr->next_descr_addr = 0;
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		descr->next = descr + 1;
		descr->prev = descr - 1;

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		buf += sizeof(struct spider_net_descr);
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	}
	/* do actual circular list */
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	(descr-1)->next = chain->ring;
	chain->ring->prev = descr-1;
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	spin_lock_init(&chain->lock);
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	chain->head = chain->ring;
	chain->tail = chain->ring;
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	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;
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	do {
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		if (descr->skb) {
			dev_kfree_skb(descr->skb);
			pci_unmap_single(card->pdev, descr->buf_addr,
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					 SPIDER_NET_MAX_FRAME,
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					 PCI_DMA_BIDIRECTIONAL);
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		}
		descr = descr->next;
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	} while (descr != card->rx_chain.head);
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}

/**
 * spider_net_prepare_rx_descr - reinitializes a rx descriptor
 * @card: card structure
 * @descr: descriptor to re-init
 *
 * 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
 */
static int
spider_net_prepare_rx_descr(struct spider_net_card *card,
			    struct spider_net_descr *descr)
{
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	dma_addr_t buf;
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	int error = 0;
	int offset;
	int bufsize;

	/* we need to round up the buffer size to a multiple of 128 */
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	bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
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		(~(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 = dev_alloc_skb(bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
	if (!descr->skb) {
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		if (netif_msg_rx_err(card) && net_ratelimit())
			pr_err("Not enough memory to allocate rx buffer\n");
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		card->spider_stats.alloc_rx_skb_error++;
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		return -ENOMEM;
	}
	descr->buf_size = bufsize;
	descr->result_size = 0;
	descr->valid_size = 0;
	descr->data_status = 0;
	descr->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 */
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	buf = pci_map_single(card->pdev, descr->skb->data,
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			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
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	descr->buf_addr = buf;
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	if (pci_dma_mapping_error(buf)) {
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		dev_kfree_skb_any(descr->skb);
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		if (netif_msg_rx_err(card) && net_ratelimit())
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			pr_err("Could not iommu-map rx buffer\n");
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		card->spider_stats.rx_iommu_map_error++;
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		descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
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	} else {
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		descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
					 SPIDER_NET_DMAC_NOINTR_COMPLETE;
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	}

	return error;
}

/**
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 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
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 * @card: card structure
 *
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 * spider_net_enable_rxchtails sets the RX DMAC chain tail adresses in the
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 * chip by writing to the appropriate register. DMA is enabled in
 * spider_net_enable_rxdmac.
 */
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static inline void
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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
 */
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static inline void
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spider_net_enable_rxdmac(struct spider_net_card *card)
{
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	wmb();
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	spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
			     SPIDER_NET_DMA_RX_VALUE);
}

/**
 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
 * @card: card structure
 *
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 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
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 */
static void
spider_net_refill_rx_chain(struct spider_net_card *card)
{
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	struct spider_net_descr_chain *chain = &card->rx_chain;
	unsigned long flags;
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	/* 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. */
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	if (!spin_trylock_irqsave(&chain->lock, flags))
		return;

	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;
	}
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	spin_unlock_irqrestore(&chain->lock, flags);
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}

/**
 * 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)
{
	int result;
	struct spider_net_descr_chain *chain;

	result = -ENOMEM;

	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 */
	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);
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	spider_net_enable_rxdmac(card);
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	return 0;

error:
	spider_net_free_rx_chain_contents(card);
	return result;
}

/**
 * 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;
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	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));
	}
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	crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
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	hash = (crc >> 27);
	hash <<= 3;
	hash |= crc & 7;
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	hash &= 0xff;
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	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 dev_mc_list *mc;
	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);

	for (mc = netdev->mc_list; mc; mc = mc->next) {
		hash = spider_net_get_multicast_hash(netdev, mc->dmi_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_disable_rxdmac - disables the receive DMA controller
 * @card: card structure
 *
 * 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_prepare_tx_descr - fill tx descriptor with skb data
 * @card: card structure
 * @descr: descriptor structure to fill out
 * @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)
{
641
	struct spider_net_descr *descr;
642
	dma_addr_t buf;
643
	unsigned long flags;
644

645
	buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
646
	if (pci_dma_mapping_error(buf)) {
647
		if (netif_msg_tx_err(card) && net_ratelimit())
648
			pr_err("could not iommu-map packet (%p, %i). "
649
				  "Dropping packet\n", skb->data, skb->len);
650
		card->spider_stats.tx_iommu_map_error++;
651 652 653
		return -ENOMEM;
	}

654 655 656 657
	spin_lock_irqsave(&card->tx_chain.lock, flags);
	descr = card->tx_chain.head;
	card->tx_chain.head = descr->next;

658
	descr->buf_addr = buf;
659
	descr->buf_size = skb->len;
660
	descr->next_descr_addr = 0;
661 662 663
	descr->skb = skb;
	descr->data_status = 0;

664 665
	descr->dmac_cmd_status =
			SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOCS;
666 667
	spin_unlock_irqrestore(&card->tx_chain.lock, flags);

668 669 670 671 672 673 674 675 676 677
	if (skb->protocol == htons(ETH_P_IP))
		switch (skb->nh.iph->protocol) {
		case IPPROTO_TCP:
			descr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
			break;
		case IPPROTO_UDP:
			descr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
			break;
		}

678
	/* Chain the bus address, so that the DMA engine finds this descr. */
679 680
	descr->prev->next_descr_addr = descr->bus_addr;

681
	card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
682 683 684
	return 0;
}

685
static int
686 687
spider_net_set_low_watermark(struct spider_net_card *card)
{
688
	unsigned long flags;
689 690 691 692 693
	int status;
	int cnt=0;
	int i;
	struct spider_net_descr *descr = card->tx_chain.tail;

694 695
	/* Measure the length of the queue. Measurement does not
	 * need to be precise -- does not need a lock. */
696 697 698 699 700 701 702 703 704
	while (descr != card->tx_chain.head) {
		status = descr->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 */
L
Linas Vepstas 已提交
705
	if (cnt < card->tx_chain.num_desc/4)
706
		return cnt;
707 708 709 710 711 712 713 714

	/* 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 */
715
	spin_lock_irqsave(&card->tx_chain.lock, flags);
716 717 718 719 720
	descr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
	if (card->low_watermark && card->low_watermark != descr)
		card->low_watermark->dmac_cmd_status =
		     card->low_watermark->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
	card->low_watermark = descr;
721
	spin_unlock_irqrestore(&card->tx_chain.lock, flags);
722
	return cnt;
723 724
}

725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
/**
 * 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 *chain = &card->tx_chain;
741 742 743 744
	struct spider_net_descr *descr;
	struct sk_buff *skb;
	u32 buf_addr;
	unsigned long flags;
745 746 747
	int status;

	while (chain->tail != chain->head) {
748 749 750 751
		spin_lock_irqsave(&chain->lock, flags);
		descr = chain->tail;

		status = spider_net_get_descr_status(descr);
752 753 754
		switch (status) {
		case SPIDER_NET_DESCR_COMPLETE:
			card->netdev_stats.tx_packets++;
755
			card->netdev_stats.tx_bytes += descr->skb->len;
756 757 758
			break;

		case SPIDER_NET_DESCR_CARDOWNED:
759 760
			if (!brutal) {
				spin_unlock_irqrestore(&chain->lock, flags);
761
				return 1;
762 763
			}

764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
			/* 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_errors++;
			break;

		default:
			card->netdev_stats.tx_dropped++;
780 781
			if (!brutal) {
				spin_unlock_irqrestore(&chain->lock, flags);
782
				return 1;
783
			}
784
		}
785

786 787 788 789 790 791 792 793
		chain->tail = descr->next;
		descr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
		skb = descr->skb;
		buf_addr = descr->buf_addr;
		spin_unlock_irqrestore(&chain->lock, flags);

		/* unmap the skb */
		if (skb) {
794 795
			pci_unmap_single(card->pdev, buf_addr, skb->len,
					PCI_DMA_TODEVICE);
796 797 798
			dev_kfree_skb(skb);
		}
	}
799 800 801 802 803 804 805 806
	return 0;
}

/**
 * spider_net_kick_tx_dma - enables TX DMA processing
 * @card: card structure
 * @descr: descriptor address to enable TX processing at
 *
807 808 809 810 811 812
 * 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.
813
 */
814 815
static inline void
spider_net_kick_tx_dma(struct spider_net_card *card)
816
{
817
	struct spider_net_descr *descr;
818

819 820 821
	if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
			SPIDER_NET_TX_DMA_EN)
		goto out;
822

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
	descr = card->tx_chain.tail;
	for (;;) {
		if (spider_net_get_descr_status(descr) ==
				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);
840 841 842 843 844 845 846
}

/**
 * spider_net_xmit - transmits a frame over the device
 * @skb: packet to send out
 * @netdev: interface device structure
 *
847
 * returns 0 on success, !0 on failure
848 849 850 851
 */
static int
spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
852
	int cnt;
853
	struct spider_net_card *card = netdev_priv(netdev);
854 855
	struct spider_net_descr_chain *chain = &card->tx_chain;

856
	spider_net_release_tx_chain(card, 0);
857

858 859
	if ((chain->head->next == chain->tail->prev) ||
	   (spider_net_prepare_tx_descr(card, skb) != 0)) {
860

861
		card->netdev_stats.tx_dropped++;
862 863
		netif_stop_queue(netdev);
		return NETDEV_TX_BUSY;
864
	}
865

866 867 868
	cnt = spider_net_set_low_watermark(card);
	if (cnt < 5)
		spider_net_kick_tx_dma(card);
869
	return NETDEV_TX_OK;
870
}
871

872 873 874 875
/**
 * spider_net_cleanup_tx_ring - cleans up the TX ring
 * @card: card structure
 *
876 877 878 879
 * 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.
880 881 882 883 884
 */
static void
spider_net_cleanup_tx_ring(struct spider_net_card *card)
{
	if ((spider_net_release_tx_chain(card, 0) != 0) &&
885
	    (card->netdev->flags & IFF_UP)) {
886
		spider_net_kick_tx_dma(card);
887 888
		netif_wake_queue(card->netdev);
	}
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912
}

/**
 * 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
913
 * @napi: whether caller is in NAPI context
914 915 916 917 918 919 920 921
 *
 * 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.
 */
static int
spider_net_pass_skb_up(struct spider_net_descr *descr,
922
		       struct spider_net_card *card, int napi)
923 924 925 926 927 928 929 930 931 932
{
	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;

933 934
	/* unmap descriptor */
	pci_unmap_single(card->pdev, descr->buf_addr, SPIDER_NET_MAX_FRAME,
935
			PCI_DMA_FROMDEVICE);
936 937

	/* the cases we'll throw away the packet immediately */
938 939 940 941 942
	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);
943
		card->spider_stats.rx_desc_error++;
944
		return 0;
945
	}
946

947
	skb = descr->skb;
948 949 950 951 952 953 954 955 956 957 958
	skb->dev = netdev;
	skb_put(skb, descr->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 */
	if (card->options.rx_csum) {
959 960 961
		if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
		       SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
		     !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
962 963 964
			skb->ip_summed = CHECKSUM_UNNECESSARY;
		else
			skb->ip_summed = CHECKSUM_NONE;
965
	} else
966 967 968 969 970 971 972 973 974
		skb->ip_summed = CHECKSUM_NONE;

	if (data_status & SPIDER_NET_VLAN_PACKET) {
		/* further enhancements: HW-accel VLAN
		 * vlan_hwaccel_receive_skb
		 */
	}

	/* pass skb up to stack */
975 976 977 978
	if (napi)
		netif_receive_skb(skb);
	else
		netif_rx_ni(skb);
979 980 981 982 983 984 985 986 987

	/* update netdevice statistics */
	card->netdev_stats.rx_packets++;
	card->netdev_stats.rx_bytes += skb->len;

	return 1;
}

/**
988
 * spider_net_decode_one_descr - processes an rx descriptor
989
 * @card: card structure
990
 * @napi: whether caller is in NAPI context
991 992 993 994
 *
 * 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
995 996
 * the packet up to the stack. This function is called in softirq
 * context, e.g. either bottom half from interrupt or NAPI polling context
997 998
 */
static int
999
spider_net_decode_one_descr(struct spider_net_card *card, int napi)
1000
{
1001 1002 1003
	struct spider_net_descr_chain *chain = &card->rx_chain;
	struct spider_net_descr *descr = chain->tail;
	int status;
1004 1005 1006 1007 1008 1009
	int result;

	status = spider_net_get_descr_status(descr);

	if (status == SPIDER_NET_DESCR_CARDOWNED) {
		/* nothing in the descriptor yet */
1010 1011
		result=0;
		goto out;
1012 1013 1014
	}

	if (status == SPIDER_NET_DESCR_NOT_IN_USE) {
1015
		/* not initialized yet, the ring must be empty */
1016
		spider_net_refill_rx_chain(card);
1017 1018 1019
		spider_net_enable_rxdmac(card);
		result=0;
		goto out;
1020 1021
	}

1022
	/* descriptor definitively used -- move on tail */
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
	chain->tail = descr->next;

	result = 0;
	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++;
1033
		pci_unmap_single(card->pdev, descr->buf_addr,
1034
				SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1035
		dev_kfree_skb_irq(descr->skb);
1036 1037 1038 1039 1040
		goto refill;
	}

	if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
	     (status != SPIDER_NET_DESCR_FRAME_END) ) {
1041
		if (netif_msg_rx_err(card))
1042 1043
			pr_err("%s: RX descriptor with state %d\n",
			       card->netdev->name, status);
1044
		card->spider_stats.rx_desc_unk_state++;
1045 1046 1047 1048
		goto refill;
	}

	/* ok, we've got a packet in descr */
1049
	result = spider_net_pass_skb_up(descr, card, napi);
1050
refill:
1051
	descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1052
	/* change the descriptor state: */
1053 1054 1055
	if (!napi)
		spider_net_refill_rx_chain(card);
out:
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	return result;
}

/**
 * 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 net_device *netdev, int *budget)
{
	struct spider_net_card *card = netdev_priv(netdev);
	int packets_to_do, packets_done = 0;
	int no_more_packets = 0;

1078
	spider_net_cleanup_tx_ring(card);
1079 1080 1081
	packets_to_do = min(*budget, netdev->quota);

	while (packets_to_do) {
1082
		if (spider_net_decode_one_descr(card, 1)) {
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
			packets_done++;
			packets_to_do--;
		} else {
			/* no more packets for the stack */
			no_more_packets = 1;
			break;
		}
	}

	netdev->quota -= packets_done;
	*budget -= packets_done;
1094
	spider_net_refill_rx_chain(card);
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188

	/* if all packets are in the stack, enable interrupts and return 0 */
	/* if not, return 1 */
	if (no_more_packets) {
		netif_rx_complete(netdev);
		spider_net_rx_irq_on(card);
		return 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;
}

/**
 * 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);
1189
	u32 macl, macu, regvalue;
1190 1191 1192 1193 1194
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

1195 1196 1197 1198 1199 1200
	/* 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 */
1201 1202 1203 1204 1205 1206
	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);

1207 1208 1209 1210 1211
	/* 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);

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
	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_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, 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++)
			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; */

1256 1257 1258 1259
	case SPIDER_NET_GIPSINT:
		show_error = 0;
		break;

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
	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))
			pr_err("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
1318
		if (card->tx_chain.tail != card->tx_chain.head)
1319
			spider_net_kick_tx_dma(card);
1320 1321
		*/
		show_error = 0;
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
		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:
1335
		if (netif_msg_intr(card) && net_ratelimit())
1336 1337 1338
			pr_err("Spider TX RAM full\n");
		show_error = 0;
		break;
1339 1340 1341 1342
	case SPIDER_NET_GRFDFLLINT: /* fallthrough */
	case SPIDER_NET_GRFCFLLINT: /* fallthrough */
	case SPIDER_NET_GRFBFLLINT: /* fallthrough */
	case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1343
	case SPIDER_NET_GRMFLLINT:
1344
		if (netif_msg_intr(card) && net_ratelimit())
1345
			pr_err("Spider RX RAM full, incoming packets "
1346 1347
			       "might be discarded!\n");
		spider_net_rx_irq_off(card);
1348
		netif_rx_schedule(card->netdev);
1349
		show_error = 0;
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
		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:
1363
		if (netif_msg_intr(card) && net_ratelimit())
1364 1365
			pr_err("got descriptor chain end interrupt, "
			       "restarting DMAC %c.\n",
1366
			       'D'-(i-SPIDER_NET_GDDDCEINT)/3);
1367
		spider_net_refill_rx_chain(card);
1368
		spider_net_enable_rxdmac(card);
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
		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_refill_rx_chain(card);
1379
		spider_net_enable_rxdmac(card);
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433
		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;
	}

1434
	if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1435
		pr_err("Got error interrupt on %s, GHIINT0STS = 0x%08x, "
1436
		       "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1437
		       card->netdev->name,
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
		       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: interupt 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.
 *
 * This is the interrupt handler, that turns off
 * interrupts for this device and makes the stack poll the driver
 */
static irqreturn_t
1458
spider_net_interrupt(int irq, void *ptr)
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
{
	struct net_device *netdev = ptr;
	struct spider_net_card *card = netdev_priv(netdev);
	u32 status_reg;

	status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);

	if (!status_reg)
		return IRQ_NONE;

	if (status_reg & SPIDER_NET_RXINT ) {
		spider_net_rx_irq_off(card);
		netif_rx_schedule(netdev);
	}
1473 1474
	if (status_reg & SPIDER_NET_TXINT)
		netif_rx_schedule(netdev);
1475

1476 1477
	if (status_reg & SPIDER_NET_ERRINT )
		spider_net_handle_error_irq(card, status_reg);
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495

	/* 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);
1496
	spider_net_interrupt(netdev->irq, netdev);
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
	enable_irq(netdev->irq);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

/**
 * 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);
}

/**
 * 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 },
1558 1559
		{ SPIDER_NET_GTESTMD, 0x10000000 },
		{ SPIDER_NET_GTTQMSK, 0x00400040 },
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611

		{ 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 adress 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_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);
1612 1613

	spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1614
			     SPIDER_NET_GDTBSTA);
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
}

/**
 * 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);
1630
	struct spider_net_descr *descr;
L
Linas Vepstas 已提交
1631
	int result;
1632

L
Linas Vepstas 已提交
1633 1634
	result = spider_net_init_chain(card, &card->tx_chain);
	if (result)
1635
		goto alloc_tx_failed;
1636 1637
	card->low_watermark = NULL;

L
Linas Vepstas 已提交
1638 1639
	result = spider_net_init_chain(card, &card->rx_chain);
	if (result)
1640 1641
		goto alloc_rx_failed;

L
Linas Vepstas 已提交
1642 1643 1644
	/* Make a ring of of bus addresses */
	descr = card->rx_chain.ring;
	do {
1645
		descr->next_descr_addr = descr->next->bus_addr;
L
Linas Vepstas 已提交
1646 1647
		descr = descr->next;
	} while (descr != card->rx_chain.ring);
1648

L
Linas Vepstas 已提交
1649
	/* Allocate rx skbs */
1650 1651 1652 1653 1654 1655 1656 1657 1658
	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,
1659
			     IRQF_SHARED, netdev->name, netdev))
1660 1661 1662 1663
		goto register_int_failed;

	spider_net_enable_card(card);

1664 1665 1666 1667
	netif_start_queue(netdev);
	netif_carrier_on(netdev);
	netif_poll_enable(netdev);

1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
	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);

1708
	phy->def->ops->enable_fiber(phy);
1709

1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
	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_download_firmware - loads firmware into the adapter
 * @card: card structure
1720
 * @firmware_ptr: pointer to firmware data
1721
 *
1722 1723
 * spider_net_download_firmware loads the firmware data into the
 * adapter. It assumes the length etc. to be allright.
1724
 */
1725
static int
1726
spider_net_download_firmware(struct spider_net_card *card,
1727
			     const void *firmware_ptr)
1728 1729
{
	int sequencer, i;
1730
	const u32 *fw_ptr = firmware_ptr;
1731 1732 1733 1734 1735

	/* stop sequencers */
	spider_net_write_reg(card, SPIDER_NET_GSINIT,
			     SPIDER_NET_STOP_SEQ_VALUE);

1736 1737
	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
	     sequencer++) {
1738 1739
		spider_net_write_reg(card,
				     SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1740
		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1741 1742 1743 1744 1745 1746
			spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
					     sequencer * 8, *fw_ptr);
			fw_ptr++;
		}
	}

1747 1748 1749
	if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
		return -EIO;

1750 1751
	spider_net_write_reg(card, SPIDER_NET_GSINIT,
			     SPIDER_NET_RUN_SEQ_VALUE);
1752 1753

	return 0;
1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
}

/**
 * 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)
{
1785
	struct firmware *firmware = NULL;
1786
	struct device_node *dn;
1787
	const u8 *fw_prop = NULL;
1788 1789
	int err = -ENOENT;
	int fw_size;
1790

1791
	if (request_firmware((const struct firmware **)&firmware,
1792 1793 1794 1795 1796 1797 1798 1799
			     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 " \
			       "filesystem. Looking in host firmware...\n");
			goto try_host_fw;
		}
		err = spider_net_download_firmware(card, firmware->data);
1800

1801 1802 1803
		release_firmware(firmware);
		if (err)
			goto try_host_fw;
1804

1805
		goto done;
1806 1807
	}

1808 1809 1810 1811 1812
try_host_fw:
	dn = pci_device_to_OF_node(card->pdev);
	if (!dn)
		goto out_err;

1813
	fw_prop = get_property(dn, "firmware", &fw_size);
1814 1815 1816 1817 1818 1819 1820 1821
	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");
		goto done;
1822 1823
	}

1824
	err = spider_net_download_firmware(card, fw_prop);
1825

1826 1827 1828 1829 1830 1831
done:
	return err;
out_err:
	if (netif_msg_probe(card))
		pr_err("Couldn't find spidernet firmware in filesystem " \
		       "or host firmware\n");
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
	return err;
}

/**
 * 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 */
1851 1852
	for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
	     sequencer++) {
1853
		spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
1854
				     sequencer * 8, 0x0);
1855
		for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
			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);
}

1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
/**
 * 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);

	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);

	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 */
1900
	spider_net_release_tx_chain(card, 1);
L
Linas Vepstas 已提交
1901
	spider_net_free_rx_chain_contents(card);
1902

1903 1904
	spider_net_free_rx_chain_contents(card);

1905 1906 1907 1908 1909 1910
	spider_net_free_chain(card, &card->tx_chain);
	spider_net_free_chain(card, &card->rx_chain);

	return 0;
}

1911 1912 1913 1914 1915 1916 1917 1918
/**
 * 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
1919
spider_net_tx_timeout_task(struct work_struct *work)
1920
{
1921 1922 1923
	struct spider_net_card *card =
		container_of(work, struct spider_net_card, tx_timeout_task);
	struct net_device *netdev = card->netdev;
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939

	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;
	if (spider_net_init_firmware(card))
		goto out;

	spider_net_open(netdev);
1940
	spider_net_kick_tx_dma(card);
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963
	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);
1964
	card->spider_stats.tx_timeouts++;
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
}

/**
 * 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->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;
	netdev->do_ioctl = &spider_net_do_ioctl;
	/* 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;
#endif /* CONFIG_NET_POLL_CONTROLLER */
	/* 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;
2017
	const u8 *mac;
2018 2019 2020 2021 2022

	SET_MODULE_OWNER(netdev);
	SET_NETDEV_DEV(netdev, &card->pdev->dev);

	pci_set_drvdata(card->pdev, netdev);
2023 2024 2025 2026 2027

	init_timer(&card->tx_timer);
	card->tx_timer.function =
		(void (*)(unsigned long)) spider_net_cleanup_tx_ring;
	card->tx_timer.data = (unsigned long) card;
2028 2029 2030 2031
	netdev->irq = card->pdev->irq;

	card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;

L
Linas Vepstas 已提交
2032 2033
	card->tx_chain.num_desc = tx_descriptors;
	card->rx_chain.num_desc = rx_descriptors;
2034

2035 2036
	spider_net_setup_netdev_ops(netdev);

2037
	netdev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX;
2038 2039 2040 2041 2042 2043
	/* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
	 *		NETIF_F_HW_VLAN_FILTER */

	netdev->irq = card->pdev->irq;

	dn = pci_device_to_OF_node(card->pdev);
2044 2045 2046
	if (!dn)
		return -EIO;

2047
	mac = get_property(dn, "local-mac-address", NULL);
2048 2049
	if (!mac)
		return -EIO;
2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
	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);

	result = register_netdev(netdev);
	if (result) {
		if (netif_msg_probe(card))
			pr_err("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;

L
Linas Vepstas 已提交
2083
	netdev = alloc_etherdev(sizeof(struct spider_net_card));
2084 2085 2086 2087 2088 2089
	if (!netdev)
		return NULL;

	card = netdev_priv(netdev);
	card->netdev = netdev;
	card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2090
	INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
	init_waitqueue_head(&card->waitq);
	atomic_set(&card->tx_timeout_task_counter, 0);

	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
 * @card: card structure
 * @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)) {
		pr_err("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");
		goto out_disable_dev;
	}

	if (pci_request_regions(pdev, spider_net_driver_name)) {
		pr_err("Couldn't obtain PCI resources, aborting.\n");
		goto out_disable_dev;
	}

	pci_set_master(pdev);

	card = spider_net_alloc_card();
	if (!card) {
		pr_err("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) {
		pr_err("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_init_firmware(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);
2243 2244 2245 2246 2247 2248 2249

	/* 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);

2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267
	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)
{
2268 2269
	printk(KERN_INFO "Spidernet version %s.\n", VERSION);

2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301
	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);
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