c2.c 32.8 KB
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/*
 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/inetdevice.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>

#include <rdma/ib_smi.h>
#include "c2.h"
#include "c2_provider.h"

MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);

static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
    | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;

static int debug = -1;		/* defaults above */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

static int c2_up(struct net_device *netdev);
static int c2_down(struct net_device *netdev);
static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static void c2_tx_interrupt(struct net_device *netdev);
static void c2_rx_interrupt(struct net_device *netdev);
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static irqreturn_t c2_interrupt(int irq, void *dev_id);
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static void c2_tx_timeout(struct net_device *netdev);
static int c2_change_mtu(struct net_device *netdev, int new_mtu);
static void c2_reset(struct c2_port *c2_port);

static struct pci_device_id c2_pci_table[] = {
	{ PCI_DEVICE(0x18b8, 0xb001) },
	{ 0 }
};

MODULE_DEVICE_TABLE(pci, c2_pci_table);

static void c2_print_macaddr(struct net_device *netdev)
{
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	pr_debug("%s: MAC %pM, IRQ %u\n", netdev->name, netdev->dev_addr, netdev->irq);
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}

static void c2_set_rxbufsize(struct c2_port *c2_port)
{
	struct net_device *netdev = c2_port->netdev;

	if (netdev->mtu > RX_BUF_SIZE)
		c2_port->rx_buf_size =
		    netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) +
		    NET_IP_ALIGN;
	else
		c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE;
}

/*
 * Allocate TX ring elements and chain them together.
 * One-to-one association of adapter descriptors with ring elements.
 */
static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr,
			    dma_addr_t base, void __iomem * mmio_txp_ring)
{
	struct c2_tx_desc *tx_desc;
	struct c2_txp_desc __iomem *txp_desc;
	struct c2_element *elem;
	int i;

	tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL);
	if (!tx_ring->start)
		return -ENOMEM;

	elem = tx_ring->start;
	tx_desc = vaddr;
	txp_desc = mmio_txp_ring;
	for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) {
		tx_desc->len = 0;
		tx_desc->status = 0;

		/* Set TXP_HTXD_UNINIT */
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		__raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL),
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			     (void __iomem *) txp_desc + C2_TXP_ADDR);
		__raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN);
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		__raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT),
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			     (void __iomem *) txp_desc + C2_TXP_FLAGS);

		elem->skb = NULL;
		elem->ht_desc = tx_desc;
		elem->hw_desc = txp_desc;

		if (i == tx_ring->count - 1) {
			elem->next = tx_ring->start;
			tx_desc->next_offset = base;
		} else {
			elem->next = elem + 1;
			tx_desc->next_offset =
			    base + (i + 1) * sizeof(*tx_desc);
		}
	}

	tx_ring->to_use = tx_ring->to_clean = tx_ring->start;

	return 0;
}

/*
 * Allocate RX ring elements and chain them together.
 * One-to-one association of adapter descriptors with ring elements.
 */
static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr,
			    dma_addr_t base, void __iomem * mmio_rxp_ring)
{
	struct c2_rx_desc *rx_desc;
	struct c2_rxp_desc __iomem *rxp_desc;
	struct c2_element *elem;
	int i;

	rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL);
	if (!rx_ring->start)
		return -ENOMEM;

	elem = rx_ring->start;
	rx_desc = vaddr;
	rxp_desc = mmio_rxp_ring;
	for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) {
		rx_desc->len = 0;
		rx_desc->status = 0;

		/* Set RXP_HRXD_UNINIT */
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		__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_OK),
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		       (void __iomem *) rxp_desc + C2_RXP_STATUS);
		__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT);
		__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN);
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		__raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL),
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			     (void __iomem *) rxp_desc + C2_RXP_ADDR);
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		__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT),
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			     (void __iomem *) rxp_desc + C2_RXP_FLAGS);

		elem->skb = NULL;
		elem->ht_desc = rx_desc;
		elem->hw_desc = rxp_desc;

		if (i == rx_ring->count - 1) {
			elem->next = rx_ring->start;
			rx_desc->next_offset = base;
		} else {
			elem->next = elem + 1;
			rx_desc->next_offset =
			    base + (i + 1) * sizeof(*rx_desc);
		}
	}

	rx_ring->to_use = rx_ring->to_clean = rx_ring->start;

	return 0;
}

/* Setup buffer for receiving */
static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_rx_desc *rx_desc = elem->ht_desc;
	struct sk_buff *skb;
	dma_addr_t mapaddr;
	u32 maplen;
	struct c2_rxp_hdr *rxp_hdr;

	skb = dev_alloc_skb(c2_port->rx_buf_size);
	if (unlikely(!skb)) {
		pr_debug("%s: out of memory for receive\n",
			c2_port->netdev->name);
		return -ENOMEM;
	}

	/* Zero out the rxp hdr in the sk_buff */
	memset(skb->data, 0, sizeof(*rxp_hdr));

	skb->dev = c2_port->netdev;

	maplen = c2_port->rx_buf_size;
	mapaddr =
	    pci_map_single(c2dev->pcidev, skb->data, maplen,
			   PCI_DMA_FROMDEVICE);

	/* Set the sk_buff RXP_header to RXP_HRXD_READY */
	rxp_hdr = (struct c2_rxp_hdr *) skb->data;
	rxp_hdr->flags = RXP_HRXD_READY;

	__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
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	__raw_writew((__force u16) cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)),
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		     elem->hw_desc + C2_RXP_LEN);
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	__raw_writeq((__force u64) cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR);
	__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
		     elem->hw_desc + C2_RXP_FLAGS);
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	elem->skb = skb;
	elem->mapaddr = mapaddr;
	elem->maplen = maplen;
	rx_desc->len = maplen;

	return 0;
}

/*
 * Allocate buffers for the Rx ring
 * For receive:  rx_ring.to_clean is next received frame
 */
static int c2_rx_fill(struct c2_port *c2_port)
{
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	int ret = 0;

	elem = rx_ring->start;
	do {
		if (c2_rx_alloc(c2_port, elem)) {
			ret = 1;
			break;
		}
	} while ((elem = elem->next) != rx_ring->start);

	rx_ring->to_clean = rx_ring->start;
	return ret;
}

/* Free all buffers in RX ring, assumes receiver stopped */
static void c2_rx_clean(struct c2_port *c2_port)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	struct c2_rx_desc *rx_desc;

	elem = rx_ring->start;
	do {
		rx_desc = elem->ht_desc;
		rx_desc->len = 0;

		__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
		__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
		__raw_writew(0, elem->hw_desc + C2_RXP_LEN);
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		__raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL),
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			     elem->hw_desc + C2_RXP_ADDR);
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		__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT),
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			     elem->hw_desc + C2_RXP_FLAGS);

		if (elem->skb) {
			pci_unmap_single(c2dev->pcidev, elem->mapaddr,
					 elem->maplen, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(elem->skb);
			elem->skb = NULL;
		}
	} while ((elem = elem->next) != rx_ring->start);
}

static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem)
{
	struct c2_tx_desc *tx_desc = elem->ht_desc;

	tx_desc->len = 0;

	pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen,
			 PCI_DMA_TODEVICE);

	if (elem->skb) {
		dev_kfree_skb_any(elem->skb);
		elem->skb = NULL;
	}

	return 0;
}

/* Free all buffers in TX ring, assumes transmitter stopped */
static void c2_tx_clean(struct c2_port *c2_port)
{
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	struct c2_txp_desc txp_htxd;
	int retry;
	unsigned long flags;

	spin_lock_irqsave(&c2_port->tx_lock, flags);

	elem = tx_ring->start;

	do {
		retry = 0;
		do {
			txp_htxd.flags =
			    readw(elem->hw_desc + C2_TXP_FLAGS);

			if (txp_htxd.flags == TXP_HTXD_READY) {
				retry = 1;
				__raw_writew(0,
					     elem->hw_desc + C2_TXP_LEN);
				__raw_writeq(0,
					     elem->hw_desc + C2_TXP_ADDR);
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				__raw_writew((__force u16) cpu_to_be16(TXP_HTXD_DONE),
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					     elem->hw_desc + C2_TXP_FLAGS);
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				c2_port->netdev->stats.tx_dropped++;
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				break;
			} else {
				__raw_writew(0,
					     elem->hw_desc + C2_TXP_LEN);
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				__raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL),
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					     elem->hw_desc + C2_TXP_ADDR);
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				__raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT),
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					     elem->hw_desc + C2_TXP_FLAGS);
			}

			c2_tx_free(c2_port->c2dev, elem);

		} while ((elem = elem->next) != tx_ring->start);
	} while (retry);

	c2_port->tx_avail = c2_port->tx_ring.count - 1;
	c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start;

	if (c2_port->tx_avail > MAX_SKB_FRAGS + 1)
		netif_wake_queue(c2_port->netdev);

	spin_unlock_irqrestore(&c2_port->tx_lock, flags);
}

/*
 * Process transmit descriptors marked 'DONE' by the firmware,
 * freeing up their unneeded sk_buffs.
 */
static void c2_tx_interrupt(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	struct c2_txp_desc txp_htxd;

	spin_lock(&c2_port->tx_lock);

	for (elem = tx_ring->to_clean; elem != tx_ring->to_use;
	     elem = elem->next) {
		txp_htxd.flags =
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		    be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_FLAGS));
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		if (txp_htxd.flags != TXP_HTXD_DONE)
			break;

		if (netif_msg_tx_done(c2_port)) {
			/* PCI reads are expensive in fast path */
			txp_htxd.len =
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			    be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_LEN));
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			pr_debug("%s: tx done slot %3Zu status 0x%x len "
				"%5u bytes\n",
				netdev->name, elem - tx_ring->start,
				txp_htxd.flags, txp_htxd.len);
		}

		c2_tx_free(c2dev, elem);
		++(c2_port->tx_avail);
	}

	tx_ring->to_clean = elem;

	if (netif_queue_stopped(netdev)
	    && c2_port->tx_avail > MAX_SKB_FRAGS + 1)
		netif_wake_queue(netdev);

	spin_unlock(&c2_port->tx_lock);
}

static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
{
	struct c2_rx_desc *rx_desc = elem->ht_desc;
	struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;

	if (rxp_hdr->status != RXP_HRXD_OK ||
	    rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) {
		pr_debug("BAD RXP_HRXD\n");
		pr_debug("  rx_desc : %p\n", rx_desc);
		pr_debug("    index : %Zu\n",
			elem - c2_port->rx_ring.start);
		pr_debug("    len   : %u\n", rx_desc->len);
		pr_debug("  rxp_hdr : %p [PA %p]\n", rxp_hdr,
			(void *) __pa((unsigned long) rxp_hdr));
		pr_debug("    flags : 0x%x\n", rxp_hdr->flags);
		pr_debug("    status: 0x%x\n", rxp_hdr->status);
		pr_debug("    len   : %u\n", rxp_hdr->len);
		pr_debug("    rsvd  : 0x%x\n", rxp_hdr->rsvd);
	}

	/* Setup the skb for reuse since we're dropping this pkt */
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	elem->skb->data = elem->skb->head;
	skb_reset_tail_pointer(elem->skb);
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	/* Zero out the rxp hdr in the sk_buff */
	memset(elem->skb->data, 0, sizeof(*rxp_hdr));

	/* Write the descriptor to the adapter's rx ring */
	__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
	__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
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	__raw_writew((__force u16) cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)),
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		     elem->hw_desc + C2_RXP_LEN);
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	__raw_writeq((__force u64) cpu_to_be64(elem->mapaddr),
		     elem->hw_desc + C2_RXP_ADDR);
	__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
		     elem->hw_desc + C2_RXP_FLAGS);
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	pr_debug("packet dropped\n");
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	c2_port->netdev->stats.rx_dropped++;
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}

static void c2_rx_interrupt(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	struct c2_rx_desc *rx_desc;
	struct c2_rxp_hdr *rxp_hdr;
	struct sk_buff *skb;
	dma_addr_t mapaddr;
	u32 maplen, buflen;
	unsigned long flags;

	spin_lock_irqsave(&c2dev->lock, flags);

	/* Begin where we left off */
	rx_ring->to_clean = rx_ring->start + c2dev->cur_rx;

	for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean;
	     elem = elem->next) {
		rx_desc = elem->ht_desc;
		mapaddr = elem->mapaddr;
		maplen = elem->maplen;
		skb = elem->skb;
		rxp_hdr = (struct c2_rxp_hdr *) skb->data;

		if (rxp_hdr->flags != RXP_HRXD_DONE)
			break;
		buflen = rxp_hdr->len;

		/* Sanity check the RXP header */
		if (rxp_hdr->status != RXP_HRXD_OK ||
		    buflen > (rx_desc->len - sizeof(*rxp_hdr))) {
			c2_rx_error(c2_port, elem);
			continue;
		}

		/*
		 * Allocate and map a new skb for replenishing the host
		 * RX desc
		 */
		if (c2_rx_alloc(c2_port, elem)) {
			c2_rx_error(c2_port, elem);
			continue;
		}

		/* Unmap the old skb */
		pci_unmap_single(c2dev->pcidev, mapaddr, maplen,
				 PCI_DMA_FROMDEVICE);

		prefetch(skb->data);

		/*
		 * Skip past the leading 8 bytes comprising of the
		 * "struct c2_rxp_hdr", prepended by the adapter
		 * to the usual Ethernet header ("struct ethhdr"),
		 * to the start of the raw Ethernet packet.
		 *
		 * Fix up the various fields in the sk_buff before
		 * passing it up to netif_rx(). The transfer size
		 * (in bytes) specified by the adapter len field of
		 * the "struct rxp_hdr_t" does NOT include the
		 * "sizeof(struct c2_rxp_hdr)".
		 */
		skb->data += sizeof(*rxp_hdr);
524
		skb_set_tail_pointer(skb, buflen);
525
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		skb->len = buflen;
		skb->protocol = eth_type_trans(skb, netdev);

		netif_rx(skb);

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531
		netdev->stats.rx_packets++;
		netdev->stats.rx_bytes += buflen;
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	}

	/* Save where we left off */
	rx_ring->to_clean = elem;
	c2dev->cur_rx = elem - rx_ring->start;
	C2_SET_CUR_RX(c2dev, c2dev->cur_rx);

	spin_unlock_irqrestore(&c2dev->lock, flags);
}

/*
 * Handle netisr0 TX & RX interrupts.
 */
545
static irqreturn_t c2_interrupt(int irq, void *dev_id)
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{
	unsigned int netisr0, dmaisr;
	int handled = 0;
	struct c2_dev *c2dev = (struct c2_dev *) dev_id;

	/* Process CCILNET interrupts */
	netisr0 = readl(c2dev->regs + C2_NISR0);
	if (netisr0) {

		/*
		 * There is an issue with the firmware that always
		 * provides the status of RX for both TX & RX
		 * interrupts.  So process both queues here.
		 */
		c2_rx_interrupt(c2dev->netdev);
		c2_tx_interrupt(c2dev->netdev);

		/* Clear the interrupt */
		writel(netisr0, c2dev->regs + C2_NISR0);
		handled++;
	}

	/* Process RNIC interrupts */
	dmaisr = readl(c2dev->regs + C2_DISR);
	if (dmaisr) {
		writel(dmaisr, c2dev->regs + C2_DISR);
		c2_rnic_interrupt(c2dev);
		handled++;
	}

	if (handled) {
		return IRQ_HANDLED;
	} else {
		return IRQ_NONE;
	}
}

static int c2_up(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_element *elem;
	struct c2_rxp_hdr *rxp_hdr;
	struct in_device *in_dev;
	size_t rx_size, tx_size;
	int ret, i;
	unsigned int netimr0;

	if (netif_msg_ifup(c2_port))
		pr_debug("%s: enabling interface\n", netdev->name);

	/* Set the Rx buffer size based on MTU */
	c2_set_rxbufsize(c2_port);

	/* Allocate DMA'able memory for Tx/Rx host descriptor rings */
	rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc);
	tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc);

	c2_port->mem_size = tx_size + rx_size;
	c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size,
					    &c2_port->dma);
	if (c2_port->mem == NULL) {
		pr_debug("Unable to allocate memory for "
			"host descriptor rings\n");
		return -ENOMEM;
	}

	memset(c2_port->mem, 0, c2_port->mem_size);

	/* Create the Rx host descriptor ring */
	if ((ret =
	     c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma,
			      c2dev->mmio_rxp_ring))) {
		pr_debug("Unable to create RX ring\n");
		goto bail0;
	}

	/* Allocate Rx buffers for the host descriptor ring */
	if (c2_rx_fill(c2_port)) {
		pr_debug("Unable to fill RX ring\n");
		goto bail1;
	}

	/* Create the Tx host descriptor ring */
	if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size,
				    c2_port->dma + rx_size,
				    c2dev->mmio_txp_ring))) {
		pr_debug("Unable to create TX ring\n");
		goto bail1;
	}

	/* Set the TX pointer to where we left off */
	c2_port->tx_avail = c2_port->tx_ring.count - 1;
	c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean =
	    c2_port->tx_ring.start + c2dev->cur_tx;

	/* missing: Initialize MAC */

	BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean);

	/* Reset the adapter, ensures the driver is in sync with the RXP */
	c2_reset(c2_port);

	/* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */
	for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count;
	     i++, elem++) {
		rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
		rxp_hdr->flags = 0;
654
		__raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY),
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			     elem->hw_desc + C2_RXP_FLAGS);
	}

	/* Enable network packets */
	netif_start_queue(netdev);

	/* Enable IRQ */
	writel(0, c2dev->regs + C2_IDIS);
	netimr0 = readl(c2dev->regs + C2_NIMR0);
	netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT);
	writel(netimr0, c2dev->regs + C2_NIMR0);

	/* Tell the stack to ignore arp requests for ipaddrs bound to
	 * other interfaces.  This is needed to prevent the host stack
	 * from responding to arp requests to the ipaddr bound on the
	 * rdma interface.
	 */
	in_dev = in_dev_get(netdev);
673
	IN_DEV_CONF_SET(in_dev, ARP_IGNORE, 1);
674
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	in_dev_put(in_dev);

	return 0;

      bail1:
	c2_rx_clean(c2_port);
	kfree(c2_port->rx_ring.start);

      bail0:
	pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
			    c2_port->dma);

	return ret;
}

static int c2_down(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;

	if (netif_msg_ifdown(c2_port))
		pr_debug("%s: disabling interface\n",
			netdev->name);

	/* Wait for all the queued packets to get sent */
	c2_tx_interrupt(netdev);

	/* Disable network packets */
	netif_stop_queue(netdev);

	/* Disable IRQs by clearing the interrupt mask */
	writel(1, c2dev->regs + C2_IDIS);
	writel(0, c2dev->regs + C2_NIMR0);

	/* missing: Stop transmitter */

	/* missing: Stop receiver */

	/* Reset the adapter, ensures the driver is in sync with the RXP */
	c2_reset(c2_port);

	/* missing: Turn off LEDs here */

	/* Free all buffers in the host descriptor rings */
	c2_tx_clean(c2_port);
	c2_rx_clean(c2_port);

	/* Free the host descriptor rings */
	kfree(c2_port->rx_ring.start);
	kfree(c2_port->tx_ring.start);
	pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
			    c2_port->dma);

	return 0;
}

static void c2_reset(struct c2_port *c2_port)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	unsigned int cur_rx = c2dev->cur_rx;

	/* Tell the hardware to quiesce */
	C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI);

	/*
	 * The hardware will reset the C2_PCI_HRX_QUI bit once
	 * the RXP is quiesced.  Wait 2 seconds for this.
	 */
	ssleep(2);

	cur_rx = C2_GET_CUR_RX(c2dev);

	if (cur_rx & C2_PCI_HRX_QUI)
		pr_debug("c2_reset: failed to quiesce the hardware!\n");

	cur_rx &= ~C2_PCI_HRX_QUI;

	c2dev->cur_rx = cur_rx;

	pr_debug("Current RX: %u\n", c2dev->cur_rx);
}

static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	dma_addr_t mapaddr;
	u32 maplen;
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&c2_port->tx_lock, flags);

	if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) {
		netif_stop_queue(netdev);
		spin_unlock_irqrestore(&c2_port->tx_lock, flags);

		pr_debug("%s: Tx ring full when queue awake!\n",
			netdev->name);
		return NETDEV_TX_BUSY;
	}

	maplen = skb_headlen(skb);
	mapaddr =
	    pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE);

	elem = tx_ring->to_use;
	elem->skb = skb;
	elem->mapaddr = mapaddr;
	elem->maplen = maplen;

	/* Tell HW to xmit */
788
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793
	__raw_writeq((__force u64) cpu_to_be64(mapaddr),
		     elem->hw_desc + C2_TXP_ADDR);
	__raw_writew((__force u16) cpu_to_be16(maplen),
		     elem->hw_desc + C2_TXP_LEN);
	__raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY),
		     elem->hw_desc + C2_TXP_FLAGS);
794

795
796
	netdev->stats.tx_packets++;
	netdev->stats.tx_bytes += maplen;
797
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811
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813

	/* Loop thru additional data fragments and queue them */
	if (skb_shinfo(skb)->nr_frags) {
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			maplen = frag->size;
			mapaddr =
			    pci_map_page(c2dev->pcidev, frag->page,
					 frag->page_offset, maplen,
					 PCI_DMA_TODEVICE);

			elem = elem->next;
			elem->skb = NULL;
			elem->mapaddr = mapaddr;
			elem->maplen = maplen;

			/* Tell HW to xmit */
814
			__raw_writeq((__force u64) cpu_to_be64(mapaddr),
815
				     elem->hw_desc + C2_TXP_ADDR);
816
			__raw_writew((__force u16) cpu_to_be16(maplen),
817
				     elem->hw_desc + C2_TXP_LEN);
818
			__raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY),
819
820
				     elem->hw_desc + C2_TXP_FLAGS);

821
822
			netdev->stats.tx_packets++;
			netdev->stats.tx_bytes += maplen;
823
824
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826
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870
		}
	}

	tx_ring->to_use = elem->next;
	c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1);

	if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) {
		netif_stop_queue(netdev);
		if (netif_msg_tx_queued(c2_port))
			pr_debug("%s: transmit queue full\n",
				netdev->name);
	}

	spin_unlock_irqrestore(&c2_port->tx_lock, flags);

	netdev->trans_start = jiffies;

	return NETDEV_TX_OK;
}

static void c2_tx_timeout(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);

	if (netif_msg_timer(c2_port))
		pr_debug("%s: tx timeout\n", netdev->name);

	c2_tx_clean(c2_port);
}

static int c2_change_mtu(struct net_device *netdev, int new_mtu)
{
	int ret = 0;

	if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
		return -EINVAL;

	netdev->mtu = new_mtu;

	if (netif_running(netdev)) {
		c2_down(netdev);

		c2_up(netdev);
	}

	return ret;
}

871
872
873
874
875
876
877
878
879
880
static const struct net_device_ops c2_netdev = {
	.ndo_open 		= c2_up,
	.ndo_stop 		= c2_down,
	.ndo_start_xmit		= c2_xmit_frame,
	.ndo_tx_timeout		= c2_tx_timeout,
	.ndo_change_mtu		= c2_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

881
882
883
884
885
886
887
888
889
890
891
892
893
894
/* Initialize network device */
static struct net_device *c2_devinit(struct c2_dev *c2dev,
				     void __iomem * mmio_addr)
{
	struct c2_port *c2_port = NULL;
	struct net_device *netdev = alloc_etherdev(sizeof(*c2_port));

	if (!netdev) {
		pr_debug("c2_port etherdev alloc failed");
		return NULL;
	}

	SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev);

895
	netdev->netdev_ops = &c2_netdev;
896
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899
900
901
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904
905
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975
976
977
978
979
980
981
982
983
984
985
986
987
	netdev->watchdog_timeo = C2_TX_TIMEOUT;
	netdev->irq = c2dev->pcidev->irq;

	c2_port = netdev_priv(netdev);
	c2_port->netdev = netdev;
	c2_port->c2dev = c2dev;
	c2_port->msg_enable = netif_msg_init(debug, default_msg);
	c2_port->tx_ring.count = C2_NUM_TX_DESC;
	c2_port->rx_ring.count = C2_NUM_RX_DESC;

	spin_lock_init(&c2_port->tx_lock);

	/* Copy our 48-bit ethernet hardware address */
	memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6);

	/* Validate the MAC address */
	if (!is_valid_ether_addr(netdev->dev_addr)) {
		pr_debug("Invalid MAC Address\n");
		c2_print_macaddr(netdev);
		free_netdev(netdev);
		return NULL;
	}

	c2dev->netdev = netdev;

	return netdev;
}

static int __devinit c2_probe(struct pci_dev *pcidev,
			      const struct pci_device_id *ent)
{
	int ret = 0, i;
	unsigned long reg0_start, reg0_flags, reg0_len;
	unsigned long reg2_start, reg2_flags, reg2_len;
	unsigned long reg4_start, reg4_flags, reg4_len;
	unsigned kva_map_size;
	struct net_device *netdev = NULL;
	struct c2_dev *c2dev = NULL;
	void __iomem *mmio_regs = NULL;

	printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n",
		DRV_VERSION);

	/* Enable PCI device */
	ret = pci_enable_device(pcidev);
	if (ret) {
		printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
			pci_name(pcidev));
		goto bail0;
	}

	reg0_start = pci_resource_start(pcidev, BAR_0);
	reg0_len = pci_resource_len(pcidev, BAR_0);
	reg0_flags = pci_resource_flags(pcidev, BAR_0);

	reg2_start = pci_resource_start(pcidev, BAR_2);
	reg2_len = pci_resource_len(pcidev, BAR_2);
	reg2_flags = pci_resource_flags(pcidev, BAR_2);

	reg4_start = pci_resource_start(pcidev, BAR_4);
	reg4_len = pci_resource_len(pcidev, BAR_4);
	reg4_flags = pci_resource_flags(pcidev, BAR_4);

	pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len);
	pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len);
	pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len);

	/* Make sure PCI base addr are MMIO */
	if (!(reg0_flags & IORESOURCE_MEM) ||
	    !(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) {
		printk(KERN_ERR PFX "PCI regions not an MMIO resource\n");
		ret = -ENODEV;
		goto bail1;
	}

	/* Check for weird/broken PCI region reporting */
	if ((reg0_len < C2_REG0_SIZE) ||
	    (reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) {
		printk(KERN_ERR PFX "Invalid PCI region sizes\n");
		ret = -ENODEV;
		goto bail1;
	}

	/* Reserve PCI I/O and memory resources */
	ret = pci_request_regions(pcidev, DRV_NAME);
	if (ret) {
		printk(KERN_ERR PFX "%s: Unable to request regions\n",
			pci_name(pcidev));
		goto bail1;
	}

	if ((sizeof(dma_addr_t) > 4)) {
988
		ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(64));
989
990
991
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993
		if (ret < 0) {
			printk(KERN_ERR PFX "64b DMA configuration failed\n");
			goto bail2;
		}
	} else {
994
		ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(32));
995
996
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998
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1003
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1005
1006
		if (ret < 0) {
			printk(KERN_ERR PFX "32b DMA configuration failed\n");
			goto bail2;
		}
	}

	/* Enables bus-mastering on the device */
	pci_set_master(pcidev);

	/* Remap the adapter PCI registers in BAR4 */
	mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
				    sizeof(struct c2_adapter_pci_regs));
1007
	if (!mmio_regs) {
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		printk(KERN_ERR PFX
			"Unable to remap adapter PCI registers in BAR4\n");
		ret = -EIO;
		goto bail2;
	}

	/* Validate PCI regs magic */
	for (i = 0; i < sizeof(c2_magic); i++) {
		if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) {
			printk(KERN_ERR PFX "Downlevel Firmware boot loader "
				"[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash "
			       "utility to update your boot loader\n",
				i + 1, sizeof(c2_magic),
				readb(mmio_regs + C2_REGS_MAGIC + i),
				c2_magic[i]);
			printk(KERN_ERR PFX "Adapter not claimed\n");
			iounmap(mmio_regs);
			ret = -EIO;
			goto bail2;
		}
	}

	/* Validate the adapter version */
1031
	if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) {
1032
1033
		printk(KERN_ERR PFX "Version mismatch "
			"[fw=%u, c2=%u], Adapter not claimed\n",
1034
			be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)),
1035
1036
1037
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1041
			C2_VERSION);
		ret = -EINVAL;
		iounmap(mmio_regs);
		goto bail2;
	}

	/* Validate the adapter IVN */
1042
	if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) {
1043
1044
1045
		printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using "
		       "the OpenIB device support kit. "
		       "[fw=0x%x, c2=0x%x], Adapter not claimed\n",
1046
1047
		       be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)),
		       C2_IVN);
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
		ret = -EINVAL;
		iounmap(mmio_regs);
		goto bail2;
	}

	/* Allocate hardware structure */
	c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev));
	if (!c2dev) {
		printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n",
			pci_name(pcidev));
		ret = -ENOMEM;
		iounmap(mmio_regs);
		goto bail2;
	}

	memset(c2dev, 0, sizeof(*c2dev));
	spin_lock_init(&c2dev->lock);
	c2dev->pcidev = pcidev;
	c2dev->cur_tx = 0;

	/* Get the last RX index */
	c2dev->cur_rx =
1070
	    (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_HRX_CUR)) -
1071
1072
1073
	     0xffffc000) / sizeof(struct c2_rxp_desc);

	/* Request an interrupt line for the driver */
1074
	ret = request_irq(pcidev->irq, c2_interrupt, IRQF_SHARED, DRV_NAME, c2dev);
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
	if (ret) {
		printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n",
			pci_name(pcidev), pcidev->irq);
		iounmap(mmio_regs);
		goto bail3;
	}

	/* Set driver specific data */
	pci_set_drvdata(pcidev, c2dev);

	/* Initialize network device */
	if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) {
		iounmap(mmio_regs);
		goto bail4;
	}

	/* Save off the actual size prior to unmapping mmio_regs */
1092
	kva_map_size = be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_PCI_WINSIZE));
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110

	/* Unmap the adapter PCI registers in BAR4 */
	iounmap(mmio_regs);

	/* Register network device */
	ret = register_netdev(netdev);
	if (ret) {
		printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n",
			ret);
		goto bail5;
	}

	/* Disable network packets */
	netif_stop_queue(netdev);

	/* Remap the adapter HRXDQ PA space to kernel VA space */
	c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET,
					       C2_RXP_HRXDQ_SIZE);
1111
	if (!c2dev->mmio_rxp_ring) {
1112
1113
1114
1115
1116
1117
1118
1119
		printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n");
		ret = -EIO;
		goto bail6;
	}

	/* Remap the adapter HTXDQ PA space to kernel VA space */
	c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET,
					       C2_TXP_HTXDQ_SIZE);
1120
	if (!c2dev->mmio_txp_ring) {
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
		printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n");
		ret = -EIO;
		goto bail7;
	}

	/* Save off the current RX index in the last 4 bytes of the TXP Ring */
	C2_SET_CUR_RX(c2dev, c2dev->cur_rx);

	/* Remap the PCI registers in adapter BAR0 to kernel VA space */
	c2dev->regs = ioremap_nocache(reg0_start, reg0_len);
1131
	if (!c2dev->regs) {
1132
1133
1134
1135
1136
1137
1138
1139
1140
		printk(KERN_ERR PFX "Unable to remap BAR0\n");
		ret = -EIO;
		goto bail8;
	}

	/* Remap the PCI registers in adapter BAR4 to kernel VA space */
	c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET;
	c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
				     kva_map_size);
1141
	if (!c2dev->kva) {
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
		printk(KERN_ERR PFX "Unable to remap BAR4\n");
		ret = -EIO;
		goto bail9;
	}

	/* Print out the MAC address */
	c2_print_macaddr(netdev);

	ret = c2_rnic_init(c2dev);
	if (ret) {
		printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret);
		goto bail10;
	}

1156
1157
	if (c2_register_device(c2dev))
		goto bail10;
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
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
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

	return 0;

 bail10:
	iounmap(c2dev->kva);

 bail9:
	iounmap(c2dev->regs);

 bail8:
	iounmap(c2dev->mmio_txp_ring);

 bail7:
	iounmap(c2dev->mmio_rxp_ring);

 bail6:
	unregister_netdev(netdev);

 bail5:
	free_netdev(netdev);

 bail4:
	free_irq(pcidev->irq, c2dev);

 bail3:
	ib_dealloc_device(&c2dev->ibdev);

 bail2:
	pci_release_regions(pcidev);

 bail1:
	pci_disable_device(pcidev);

 bail0:
	return ret;
}

static void __devexit c2_remove(struct pci_dev *pcidev)
{
	struct c2_dev *c2dev = pci_get_drvdata(pcidev);
	struct net_device *netdev = c2dev->netdev;

	/* Unregister with OpenIB */
	c2_unregister_device(c2dev);

	/* Clean up the RNIC resources */
	c2_rnic_term(c2dev);

	/* Remove network device from the kernel */
	unregister_netdev(netdev);

	/* Free network device */
	free_netdev(netdev);

	/* Free the interrupt line */
	free_irq(pcidev->irq, c2dev);

	/* missing: Turn LEDs off here */

	/* Unmap adapter PA space */
	iounmap(c2dev->kva);
	iounmap(c2dev->regs);
	iounmap(c2dev->mmio_txp_ring);
	iounmap(c2dev->mmio_rxp_ring);

	/* Free the hardware structure */
	ib_dealloc_device(&c2dev->ibdev);

	/* Release reserved PCI I/O and memory resources */
	pci_release_regions(pcidev);

	/* Disable PCI device */
	pci_disable_device(pcidev);

	/* Clear driver specific data */
	pci_set_drvdata(pcidev, NULL);
}

static struct pci_driver c2_pci_driver = {
	.name = DRV_NAME,
	.id_table = c2_pci_table,
	.probe = c2_probe,
	.remove = __devexit_p(c2_remove),
};

static int __init c2_init_module(void)
{
1245
	return pci_register_driver(&c2_pci_driver);
1246
1247
1248
1249
1250
1251
1252
1253
1254
}

static void __exit c2_exit_module(void)
{
	pci_unregister_driver(&c2_pci_driver);
}

module_init(c2_init_module);
module_exit(c2_exit_module);