path: root/drivers/staging/sxg/sxg.c

/**************************************************************************
 *
 * Copyright (C) 2000-2008 Alacritech, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY ALACRITECH, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ALACRITECH, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies, either expressed or implied, of Alacritech, Inc.
 *
 * Parts developed by LinSysSoft Sahara team
 *
 **************************************************************************/

/*
 * FILENAME: sxg.c
 *
 * The SXG driver for Alacritech's 10Gbe products.
 *
 * NOTE: This is the standard, non-accelerated version of Alacritech's
 *       IS-NIC driver.
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mii.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/ipv6.h>

#define SLIC_GET_STATS_ENABLED		0
#define LINUX_FREES_ADAPTER_RESOURCES	1
#define SXG_OFFLOAD_IP_CHECKSUM		0
#define SXG_POWER_MANAGEMENT_ENABLED	0
#define VPCI				0
#define ATK_DEBUG			1
#define SXG_UCODE_DEBUG		0


#include "sxg_os.h"
#include "sxghw.h"
#include "sxghif.h"
#include "sxg.h"
#include "sxgdbg.h"
#include "sxgphycode-1.2.h"

static int sxg_allocate_buffer_memory(struct adapter_t *adapter, u32 Size,
				      enum sxg_buffer_type BufferType);
static int sxg_allocate_rcvblock_complete(struct adapter_t *adapter,
						void *RcvBlock,
						dma_addr_t PhysicalAddress,
						u32 Length);
static void sxg_allocate_sgl_buffer_complete(struct adapter_t *adapter,
					     struct sxg_scatter_gather *SxgSgl,
					     dma_addr_t PhysicalAddress,
					     u32 Length);

static void sxg_mcast_init_crc32(void);
static int sxg_entry_open(struct net_device *dev);
static int sxg_second_open(struct net_device * dev);
static int sxg_entry_halt(struct net_device *dev);
static int sxg_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static int sxg_send_packets(struct sk_buff *skb, struct net_device *dev);
static int sxg_transmit_packet(struct adapter_t *adapter, struct sk_buff *skb);
static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl,
				struct sxg_scatter_gather *SxgSgl);

static void sxg_handle_interrupt(struct adapter_t *adapter, int *work_done,
					 int budget);
static void sxg_interrupt(struct adapter_t *adapter);
static int sxg_poll(struct napi_struct *napi, int budget);
static int sxg_process_isr(struct adapter_t *adapter, u32 MessageId);
static u32 sxg_process_event_queue(struct adapter_t *adapter, u32 RssId,
			 int *sxg_napi_continue, int *work_done, int budget);
static void sxg_complete_slow_send(struct adapter_t *adapter);
static struct sk_buff *sxg_slow_receive(struct adapter_t *adapter,
					struct sxg_event *Event);
static void sxg_process_rcv_error(struct adapter_t *adapter, u32 ErrorStatus);
static bool sxg_mac_filter(struct adapter_t *adapter,
			   struct ether_header *EtherHdr, ushort length);
static struct net_device_stats *sxg_get_stats(struct net_device * dev);
void sxg_free_resources(struct adapter_t *adapter);
void sxg_free_rcvblocks(struct adapter_t *adapter);
void sxg_free_sgl_buffers(struct adapter_t *adapter);
void sxg_unmap_resources(struct adapter_t *adapter);
void sxg_free_mcast_addrs(struct adapter_t *adapter);
void sxg_collect_statistics(struct adapter_t *adapter);
static int sxg_register_interrupt(struct adapter_t *adapter);
static void sxg_remove_isr(struct adapter_t *adapter);
static irqreturn_t sxg_isr(int irq, void *dev_id);

static void sxg_watchdog(unsigned long data);
static void sxg_update_link_status (struct work_struct *work);

#define XXXTODO 0

#if XXXTODO
static int sxg_mac_set_address(struct net_device *dev, void *ptr);
#endif
static void sxg_mcast_set_list(struct net_device *dev);

static int sxg_adapter_set_hwaddr(struct adapter_t *adapter);

static int sxg_initialize_adapter(struct adapter_t *adapter);
static void sxg_stock_rcv_buffers(struct adapter_t *adapter);
static void sxg_complete_descriptor_blocks(struct adapter_t *adapter,
					   unsigned char Index);
int sxg_change_mtu (struct net_device *netdev, int new_mtu);
static int sxg_initialize_link(struct adapter_t *adapter);
static int sxg_phy_init(struct adapter_t *adapter);
static void sxg_link_event(struct adapter_t *adapter);
static enum SXG_LINK_STATE sxg_get_link_state(struct adapter_t *adapter);
static void sxg_link_state(struct adapter_t *adapter,
				enum SXG_LINK_STATE LinkState);
static int sxg_write_mdio_reg(struct adapter_t *adapter,
			      u32 DevAddr, u32 RegAddr, u32 Value);
static int sxg_read_mdio_reg(struct adapter_t *adapter,
			     u32 DevAddr, u32 RegAddr, u32 *pValue);
static void sxg_set_mcast_addr(struct adapter_t *adapter);

static unsigned int sxg_first_init = 1;
static char *sxg_banner =
    "Alacritech SLIC Technology(tm) Server and Storage \
	 10Gbe Accelerator (Non-Accelerated)\n";

static int sxg_debug = 1;
static int debug = -1;
static struct net_device *head_netdevice = NULL;

static struct sxgbase_driver sxg_global = {
	.dynamic_intagg = 1,
};
static int intagg_delay = 100;
static u32 dynamic_intagg = 0;

char sxg_driver_name[] = "sxg_nic";
#define DRV_AUTHOR	"Alacritech, Inc. Engineering"
#define DRV_DESCRIPTION							\
	"Alacritech SLIC Techonology(tm) Non-Accelerated 10Gbe Driver"
#define DRV_COPYRIGHT							\
	"Copyright 2000-2008 Alacritech, Inc.  All rights reserved."

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_LICENSE("GPL");

module_param(dynamic_intagg, int, 0);
MODULE_PARM_DESC(dynamic_intagg, "Dynamic Interrupt Aggregation Setting");
module_param(intagg_delay, int, 0);
MODULE_PARM_DESC(intagg_delay, "uSec Interrupt Aggregation Delay");

static struct pci_device_id sxg_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(SXG_VENDOR_ID, SXG_DEVICE_ID)},
	{0,}
};

MODULE_DEVICE_TABLE(pci, sxg_pci_tbl);

static inline void sxg_reg32_write(void __iomem *reg, u32 value, bool flush)
{
	writel(value, reg);
	if (flush)
		mb();
}

static inline void sxg_reg64_write(struct adapter_t *adapter, void __iomem *reg,
				   u64 value, u32 cpu)
{
	u32 value_high = (u32) (value >> 32);
	u32 value_low = (u32) (value & 0x00000000FFFFFFFF);
	unsigned long flags;

	spin_lock_irqsave(&adapter->Bit64RegLock, flags);
	writel(value_high, (void __iomem *)(&adapter->UcodeRegs[cpu].Upper));
	writel(value_low, reg);
	spin_unlock_irqrestore(&adapter->Bit64RegLock, flags);
}

static void sxg_init_driver(void)
{
	if (sxg_first_init) {
		DBG_ERROR("sxg: %s sxg_first_init set jiffies[%lx]\n",
			  __func__, jiffies);
		sxg_first_init = 0;
		spin_lock_init(&sxg_global.driver_lock);
	}
}

static void sxg_dbg_macaddrs(struct adapter_t *adapter)
{
	DBG_ERROR("  (%s) curr %2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X\n",
		  adapter->netdev->name, adapter->currmacaddr[0],
		  adapter->currmacaddr[1], adapter->currmacaddr[2],
		  adapter->currmacaddr[3], adapter->currmacaddr[4],
		  adapter->currmacaddr[5]);
	DBG_ERROR("  (%s) mac  %2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X\n",
		  adapter->netdev->name, adapter->macaddr[0],
		  adapter->macaddr[1], adapter->macaddr[2],
		  adapter->macaddr[3], adapter->macaddr[4],
		  adapter->macaddr[5]);
	return;
}

/* SXG Globals */
static struct sxg_driver SxgDriver;

#ifdef  ATKDBG
static struct sxg_trace_buffer LSxgTraceBuffer;
#endif /* ATKDBG */
static struct sxg_trace_buffer *SxgTraceBuffer = NULL;

/*
 * MSI Related API's
 */
int sxg_register_intr(struct adapter_t *adapter);
int sxg_enable_msi_x(struct adapter_t *adapter);
int sxg_add_msi_isr(struct adapter_t *adapter);
void sxg_remove_msix_isr(struct adapter_t *adapter);
int sxg_set_interrupt_capability(struct adapter_t *adapter);

int sxg_set_interrupt_capability(struct adapter_t *adapter)
{
	int ret;

	ret = sxg_enable_msi_x(adapter);
	if (ret != STATUS_SUCCESS) {
		adapter->msi_enabled = FALSE;
		DBG_ERROR("sxg_set_interrupt_capability MSI-X Disable\n");
	} else {
		adapter->msi_enabled = TRUE;
		DBG_ERROR("sxg_set_interrupt_capability MSI-X Enable\n");
	}
	return ret;
}

int sxg_register_intr(struct adapter_t *adapter)
{
	int ret = 0;

	if (adapter->msi_enabled) {
		ret = sxg_add_msi_isr(adapter);
	}
	else {
		DBG_ERROR("MSI-X Enable Failed. Using Pin INT\n");
		ret = sxg_register_interrupt(adapter);
		if (ret != STATUS_SUCCESS) {
			DBG_ERROR("sxg_register_interrupt Failed\n");
		}
	}
	return ret;
}

int sxg_enable_msi_x(struct adapter_t *adapter)
{
	int ret;

	adapter->nr_msix_entries = 1;
	adapter->msi_entries =  kmalloc(adapter->nr_msix_entries *
					sizeof(struct msix_entry),GFP_KERNEL);
	if (!adapter->msi_entries) {
		DBG_ERROR("%s:MSI Entries memory allocation Failed\n",__func__);
		return -ENOMEM;
	}
	memset(adapter->msi_entries, 0, adapter->nr_msix_entries *
		sizeof(struct msix_entry));

	ret = pci_enable_msix(adapter->pcidev, adapter->msi_entries,
				adapter->nr_msix_entries);
	if (ret) {
		DBG_ERROR("Enabling MSI-X with %d vectors failed\n",
				adapter->nr_msix_entries);
		/*Should try with less vector returned.*/
		kfree(adapter->msi_entries);
		return STATUS_FAILURE; /*MSI-X Enable failed.*/
	}
	return (STATUS_SUCCESS);
}

int sxg_add_msi_isr(struct adapter_t *adapter)
{
	int ret,i;

	if (!adapter->intrregistered) {
		spin_unlock_irqrestore(&sxg_global.driver_lock,
					sxg_global.flags);
		for (i=0; i<adapter->nr_msix_entries; i++) {
			ret = request_irq (adapter->msi_entries[i].vector,
					sxg_isr,
					IRQF_SHARED,
					adapter->netdev->name,
					adapter->netdev);
			if (ret) {
				spin_lock_irqsave(&sxg_global.driver_lock,
						 sxg_global.flags);
				DBG_ERROR("sxg: MSI-X request_irq (%s) "
					"FAILED [%x]\n", adapter->netdev->name,
					 ret);
				return (ret);
			}
		}
	}
	spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
	adapter->msi_enabled = TRUE;
	adapter->intrregistered = 1;
	adapter->IntRegistered = TRUE;
	return (STATUS_SUCCESS);
}

void sxg_remove_msix_isr(struct adapter_t *adapter)
{
	int i,vector;
	struct net_device *netdev = adapter->netdev;

	for(i=0; i< adapter->nr_msix_entries;i++)
	{
		vector = adapter->msi_entries[i].vector;
		DBG_ERROR("%s : Freeing IRQ vector#%d\n",__FUNCTION__,vector);
		free_irq(vector,netdev);
	}
}


static void sxg_remove_isr(struct adapter_t *adapter)
{
	struct net_device *netdev = adapter->netdev;
	if (adapter->msi_enabled)
		sxg_remove_msix_isr(adapter);
	else
		free_irq(adapter->netdev->irq, netdev);
}

void sxg_reset_interrupt_capability(struct adapter_t *adapter)
{
	if (adapter->msi_enabled) {
		pci_disable_msix(adapter->pcidev);
		kfree(adapter->msi_entries);
		adapter->msi_entries = NULL;
	}
	return;
}

/*
 * sxg_download_microcode
 *
 * Download Microcode to Sahara adapter using the Linux
 * Firmware module to get the ucode.sys file.
 *
 * Arguments -
 *		adapter		- A pointer to our adapter structure
 *		UcodeSel	- microcode file selection
 *
 * Return
 *	int
 */
static bool sxg_download_microcode(struct adapter_t *adapter,
						enum SXG_UCODE_SEL UcodeSel)
{
	const struct firmware *fw;
	const char *file = "";
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	int ret;
	int ucode_start;
	u32 Section;
	u32 ThisSectionSize;
	u32 instruction = 0;
	u32 BaseAddress, AddressOffset, Address;
	/* u32 Failure; */
	u32 ValueRead;
	u32 i;
	u32 index = 0;
	u32 num_sections = 0;
	u32 sectionSize[16];
	u32 sectionStart[16];

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DnldUcod",
		  adapter, 0, 0, 0);

	/*
	 *  This routine is only implemented to download the microcode
	 *  for the Revision B Sahara chip.  Rev A and Diagnostic
	 *  microcode is not supported at this time.  If Rev A or
	 *  diagnostic ucode is required, this routine will obviously
	 *  need to change.  Also, eventually need to add support for
	 *  Rev B checked version of ucode.  That's easy enough once
	 *  the free version of Rev B works.
	 */
	ASSERT(UcodeSel == SXG_UCODE_SYSTEM);
	ASSERT(adapter->asictype == SAHARA_REV_B);
#if SXG_UCODE_DEBUG
	file = "sxg/saharadbgdownloadB.sys";
#else
	file = "sxg/saharadownloadB.sys";
#endif
	ret = request_firmware(&fw, file, &adapter->pcidev->dev);
	if (ret) {
		DBG_ERROR("%s SXG_NIC: Failed to load firmware %s\n", __func__,file);
		return ret;
	}

	/*
	 *  The microcode .sys file contains starts with a 4 byte word containing
	 *  the number of sections. That is followed by "num_sections" 4 byte
	 *  words containing each "section" size.  That is followed num_sections
	 *  4 byte words containing each section "start" address.
	 *
	 *  Following the above header, the .sys file contains num_sections,
	 *  where each section size is specified, newline delineatetd 12 byte
	 *  microcode instructions.
	 */
	num_sections = *(u32 *)(fw->data + index);
	index += 4;
	ASSERT(num_sections <= 3);
	for (i = 0; i < num_sections; i++) {
		sectionSize[i] = *(u32 *)(fw->data + index);
		index += 4;
	}
	for (i = 0; i < num_sections; i++) {
		sectionStart[i] = *(u32 *)(fw->data + index);
		index += 4;
	}

	/* First, reset the card */
	WRITE_REG(HwRegs->Reset, 0xDEAD, FLUSH);
	udelay(50);
	HwRegs = adapter->HwRegs;

	/*
	 * Download each section of the microcode as specified in
	 * sectionSize[index] to sectionStart[index] address.  As
	 * described above, the .sys file contains 12 byte word
	 * microcode instructions. The *download.sys file is generated
	 * using the objtosys.exe utility that was built for Sahara
	 * microcode.
	 */
	/* See usage of this below when we read back for parity */
	ucode_start = index;
	instruction = *(u32 *)(fw->data + index);
	index += 4;

	for (Section = 0; Section < num_sections; Section++) {
		BaseAddress = sectionStart[Section];
		/* Size in instructions */
		ThisSectionSize = sectionSize[Section] / 12;
		for (AddressOffset = 0; AddressOffset < ThisSectionSize;
		     AddressOffset++) {
			u32 first_instr = 0;  /* See comment below */

			Address = BaseAddress + AddressOffset;
			ASSERT((Address & ~MICROCODE_ADDRESS_MASK) == 0);
			/* Write instruction bits 31 - 0 (low) */
			first_instr = instruction;
			WRITE_REG(HwRegs->UcodeDataLow, instruction, FLUSH);
			instruction = *(u32 *)(fw->data + index);
			index += 4;  /* Advance to the "next" instruction */

			/* Write instruction bits 63-32 (middle) */
			WRITE_REG(HwRegs->UcodeDataMiddle, instruction, FLUSH);
			instruction = *(u32 *)(fw->data + index);
			index += 4;  /* Advance to the "next" instruction */

			/* Write instruction bits 95-64 (high) */
			WRITE_REG(HwRegs->UcodeDataHigh, instruction, FLUSH);
			instruction = *(u32 *)(fw->data + index);
			index += 4;  /* Advance to the "next" instruction */

			/* Write instruction address with the WRITE bit set */
			WRITE_REG(HwRegs->UcodeAddr,
				  (Address | MICROCODE_ADDRESS_WRITE), FLUSH);
			/*
			 * Sahara bug in the ucode download logic - the write to DataLow
			 * for the next instruction could get corrupted.  To avoid this,
			 * write to DataLow again for this instruction (which may get
			 * corrupted, but it doesn't matter), then increment the address
			 * and write the data for the next instruction to DataLow.  That
			 * write should succeed.
			 */
			WRITE_REG(HwRegs->UcodeDataLow, first_instr, FLUSH);
		}
	}
	/*
	 * Now repeat the entire operation reading the instruction back and
	 * checking for parity errors
	 */
	index = ucode_start;

	for (Section = 0; Section < num_sections; Section++) {
		BaseAddress = sectionStart[Section];
		/* Size in instructions */
		ThisSectionSize = sectionSize[Section] / 12;
		for (AddressOffset = 0; AddressOffset < ThisSectionSize;
		     AddressOffset++) {
			Address = BaseAddress + AddressOffset;
			/* Write the address with the READ bit set */
			WRITE_REG(HwRegs->UcodeAddr,
				  (Address | MICROCODE_ADDRESS_READ), FLUSH);
			/* Read it back and check parity bit. */
			READ_REG(HwRegs->UcodeAddr, ValueRead);
			if (ValueRead & MICROCODE_ADDRESS_PARITY) {
				DBG_ERROR("sxg: %s PARITY ERROR\n",
					  __func__);

				return FALSE;	/* Parity error */
			}
			ASSERT((ValueRead & MICROCODE_ADDRESS_MASK) == Address);
			/* Read the instruction back and compare */
			/* First instruction */
			instruction = *(u32 *)(fw->data + index);
			index += 4;
			READ_REG(HwRegs->UcodeDataLow, ValueRead);
			if (ValueRead != instruction) {
				DBG_ERROR("sxg: %s MISCOMPARE LOW\n",
					  __func__);
				return FALSE;	/* Miscompare */
			}
			instruction = *(u32 *)(fw->data + index);
			index += 4;
			READ_REG(HwRegs->UcodeDataMiddle, ValueRead);
			if (ValueRead != instruction) {
				DBG_ERROR("sxg: %s MISCOMPARE MIDDLE\n",
					  __func__);
				return FALSE;	/* Miscompare */
			}
			instruction = *(u32 *)(fw->data + index);
			index += 4;
			READ_REG(HwRegs->UcodeDataHigh, ValueRead);
			if (ValueRead != instruction) {
				DBG_ERROR("sxg: %s MISCOMPARE HIGH\n",
					  __func__);
				return FALSE;	/* Miscompare */
			}
		}
	}

	/* download finished */
	release_firmware(fw);
	/* Everything OK, Go. */
	WRITE_REG(HwRegs->UcodeAddr, MICROCODE_ADDRESS_GO, FLUSH);

	/*
	 * Poll the CardUp register to wait for microcode to initialize
	 * Give up after 10,000 attemps (500ms).
	 */
	for (i = 0; i < 10000; i++) {
		udelay(50);
		READ_REG(adapter->UcodeRegs[0].CardUp, ValueRead);
		if (ValueRead == 0xCAFE) {
			break;
		}
	}
	if (i == 10000) {
		DBG_ERROR("sxg: %s TIMEOUT bringing up card - verify MICROCODE\n", __func__);

		return FALSE;	/* Timeout */
	}
	/*
	 * Now write the LoadSync register.  This is used to
	 * synchronize with the card so it can scribble on the memory
	 * that contained 0xCAFE from the "CardUp" step above
	 */
	if (UcodeSel == SXG_UCODE_SYSTEM) {
		WRITE_REG(adapter->UcodeRegs[0].LoadSync, 0, FLUSH);
	}

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XDnldUcd",
		  adapter, 0, 0, 0);
	return (TRUE);
}

/*
 * sxg_allocate_resources - Allocate memory and locks
 *
 * Arguments -
 *	adapter	- A pointer to our adapter structure
 *
 * Return - int
 */
static int sxg_allocate_resources(struct adapter_t *adapter)
{
	int status = STATUS_SUCCESS;
	u32 RssIds, IsrCount;
	/* struct sxg_xmt_ring	*XmtRing; */
	/* struct sxg_rcv_ring	*RcvRing; */

	DBG_ERROR("%s ENTER\n", __func__);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AllocRes",
		  adapter, 0, 0, 0);

	/* Windows tells us how many CPUs it plans to use for */
	/* RSS */
	RssIds = SXG_RSS_CPU_COUNT(adapter);
	IsrCount = adapter->msi_enabled ? RssIds : 1;

	DBG_ERROR("%s Setup the spinlocks\n", __func__);

	/* Allocate spinlocks and initialize listheads first. */
	spin_lock_init(&adapter->RcvQLock);
	spin_lock_init(&adapter->SglQLock);
	spin_lock_init(&adapter->XmtZeroLock);
	spin_lock_init(&adapter->Bit64RegLock);
	spin_lock_init(&adapter->AdapterLock);
	atomic_set(&adapter->pending_allocations, 0);

	DBG_ERROR("%s Setup the lists\n", __func__);

	InitializeListHead(&adapter->FreeRcvBuffers);
	InitializeListHead(&adapter->FreeRcvBlocks);
	InitializeListHead(&adapter->AllRcvBlocks);
	InitializeListHead(&adapter->FreeSglBuffers);
	InitializeListHead(&adapter->AllSglBuffers);

	/*
	 * Mark these basic allocations done.  This flags essentially
	 * tells the SxgFreeResources routine that it can grab spinlocks
	 * and reference listheads.
	 */
	adapter->BasicAllocations = TRUE;
	/*
	 * Main allocation loop.  Start with the maximum supported by
	 * the microcode and back off if memory allocation
	 * fails.  If we hit a minimum, fail.
	 */

	for (;;) {
		DBG_ERROR("%s Allocate XmtRings size[%x]\n", __func__,
			  (unsigned int)(sizeof(struct sxg_xmt_ring) * 1));

		/*
		 * Start with big items first - receive and transmit rings.
		 * At the moment I'm going to keep the ring size fixed and
		 * adjust the TCBs if we fail.  Later we might
		 * consider reducing the ring size as well..
		 */
		adapter->XmtRings = pci_alloc_consistent(adapter->pcidev,
						 sizeof(struct sxg_xmt_ring) *
						 1,
						 &adapter->PXmtRings);
		DBG_ERROR("%s XmtRings[%p]\n", __func__, adapter->XmtRings);

		if (!adapter->XmtRings) {
			goto per_tcb_allocation_failed;
		}
		memset(adapter->XmtRings, 0, sizeof(struct sxg_xmt_ring) * 1);

		DBG_ERROR("%s Allocate RcvRings size[%x]\n", __func__,
			  (unsigned int)(sizeof(struct sxg_rcv_ring) * 1));
		adapter->RcvRings =
		    pci_alloc_consistent(adapter->pcidev,
					 sizeof(struct sxg_rcv_ring) * 1,
					 &adapter->PRcvRings);
		DBG_ERROR("%s RcvRings[%p]\n", __func__, adapter->RcvRings);
		if (!adapter->RcvRings) {
			goto per_tcb_allocation_failed;
		}
		memset(adapter->RcvRings, 0, sizeof(struct sxg_rcv_ring) * 1);
		adapter->ucode_stats = kzalloc(sizeof(struct sxg_ucode_stats), GFP_ATOMIC);
		adapter->pucode_stats = pci_map_single(adapter->pcidev,
						adapter->ucode_stats,
						sizeof(struct sxg_ucode_stats),
						PCI_DMA_FROMDEVICE);
//		memset(adapter->ucode_stats, 0, sizeof(struct sxg_ucode_stats));
		break;

	      per_tcb_allocation_failed:
		/* an allocation failed.  Free any successful allocations. */
		if (adapter->XmtRings) {
			pci_free_consistent(adapter->pcidev,
					    sizeof(struct sxg_xmt_ring) * 1,
					    adapter->XmtRings,
					    adapter->PXmtRings);
			adapter->XmtRings = NULL;
		}
		if (adapter->RcvRings) {
			pci_free_consistent(adapter->pcidev,
					    sizeof(struct sxg_rcv_ring) * 1,
					    adapter->RcvRings,
					    adapter->PRcvRings);
			adapter->RcvRings = NULL;
		}
		/* Loop around and try again.... */
		if (adapter->ucode_stats) {
			pci_unmap_single(adapter->pcidev,
					sizeof(struct sxg_ucode_stats),
					adapter->pucode_stats, PCI_DMA_FROMDEVICE);
			adapter->ucode_stats = NULL;
		}

	}

	DBG_ERROR("%s Initialize RCV ZERO and XMT ZERO rings\n", __func__);
	/* Initialize rcv zero and xmt zero rings */
	SXG_INITIALIZE_RING(adapter->RcvRingZeroInfo, SXG_RCV_RING_SIZE);
	SXG_INITIALIZE_RING(adapter->XmtRingZeroInfo, SXG_XMT_RING_SIZE);

	/* Sanity check receive data structure format */
	/* ASSERT((adapter->ReceiveBufferSize == SXG_RCV_DATA_BUFFER_SIZE) ||
	       (adapter->ReceiveBufferSize == SXG_RCV_JUMBO_BUFFER_SIZE)); */
	ASSERT(sizeof(struct sxg_rcv_descriptor_block) ==
	       SXG_RCV_DESCRIPTOR_BLOCK_SIZE);

	DBG_ERROR("%s Allocate EventRings size[%x]\n", __func__,
		  (unsigned int)(sizeof(struct sxg_event_ring) * RssIds));

	/* Allocate event queues. */
	adapter->EventRings = pci_alloc_consistent(adapter->pcidev,
					   sizeof(struct sxg_event_ring) *
					   RssIds,
					   &adapter->PEventRings);

	if (!adapter->EventRings) {
		/* Caller will call SxgFreeAdapter to clean up above
		 * allocations */
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAResF8",
			  adapter, SXG_MAX_ENTRIES, 0, 0);
		status = STATUS_RESOURCES;
		goto per_tcb_allocation_failed;
	}
	memset(adapter->EventRings, 0, sizeof(struct sxg_event_ring) * RssIds);

	DBG_ERROR("%s Allocate ISR size[%x]\n", __func__, IsrCount);
	/* Allocate ISR */
	adapter->Isr = pci_alloc_consistent(adapter->pcidev,
					    IsrCount, &adapter->PIsr);
	if (!adapter->Isr) {
		/* Caller will call SxgFreeAdapter to clean up above
		 * allocations */
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAResF9",
			  adapter, SXG_MAX_ENTRIES, 0, 0);
		status = STATUS_RESOURCES;
		goto per_tcb_allocation_failed;
	}
	memset(adapter->Isr, 0, sizeof(u32) * IsrCount);

	DBG_ERROR("%s Allocate shared XMT ring zero index location size[%x]\n",
		  __func__, (unsigned int)sizeof(u32));

	/* Allocate shared XMT ring zero index location */
	adapter->XmtRingZeroIndex = pci_alloc_consistent(adapter->pcidev,
							 sizeof(u32),
							 &adapter->
							 PXmtRingZeroIndex);
	if (!adapter->XmtRingZeroIndex) {
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAResF10",
			  adapter, SXG_MAX_ENTRIES, 0, 0);
		status = STATUS_RESOURCES;
		goto per_tcb_allocation_failed;
	}
	memset(adapter->XmtRingZeroIndex, 0, sizeof(u32));

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAlcResS",
		  adapter, SXG_MAX_ENTRIES, 0, 0);

	return status;
}

/*
 * sxg_config_pci -
 *
 * Set up PCI Configuration space
 *
 * Arguments -
 *		pcidev			- A pointer to our adapter structure
 */
static void sxg_config_pci(struct pci_dev *pcidev)
{
	u16 pci_command;
	u16 new_command;

	pci_read_config_word(pcidev, PCI_COMMAND, &pci_command);
	DBG_ERROR("sxg: %s  PCI command[%4.4x]\n", __func__, pci_command);
	/* Set the command register */
	new_command = pci_command | (
				     /* Memory Space Enable */
				     PCI_COMMAND_MEMORY |
				     /* Bus master enable */
				     PCI_COMMAND_MASTER |
			     	     /* Memory write and invalidate */
				     PCI_COMMAND_INVALIDATE |
				     /* Parity error response */
				     PCI_COMMAND_PARITY |
				     /* System ERR */
				     PCI_COMMAND_SERR |
				     /* Fast back-to-back */
				     PCI_COMMAND_FAST_BACK);
	if (pci_command != new_command) {
		DBG_ERROR("%s -- Updating PCI COMMAND register %4.4x->%4.4x.\n",
			  __func__, pci_command, new_command);
		pci_write_config_word(pcidev, PCI_COMMAND, new_command);
	}
}

/*
 * sxg_read_config
 * 	@adapter : Pointer to the adapter structure for the card
 * This function will read the configuration data from EEPROM/FLASH
 */
static inline int sxg_read_config(struct adapter_t *adapter)
{
	/* struct sxg_config	data; */
  	struct sxg_config	*config;
	struct sw_cfg_data	*data;
	dma_addr_t		p_addr;
	unsigned long		status;
	unsigned long		i;
 	config = pci_alloc_consistent(adapter->pcidev,
 					sizeof(struct sxg_config), &p_addr);

  	if(!config) {
		/*
		 * We cant get even this much memory. Raise a hell
 		 * Get out of here
 		 */
		printk(KERN_ERR"%s : Could not allocate memory for reading \
				 EEPROM\n", __FUNCTION__);
		return -ENOMEM;
	}

	data = &config->SwCfg;

    /* Initialize (reflective memory) status register */
	WRITE_REG(adapter->UcodeRegs[0].ConfigStat, SXG_CFG_TIMEOUT, TRUE);

    /* Send request to fetch configuration data */
	WRITE_REG64(adapter, adapter->UcodeRegs[0].Config, p_addr, 0);
	for(i=0; i<1000; i++) {
		READ_REG(adapter->UcodeRegs[0].ConfigStat, status);
		if (status != SXG_CFG_TIMEOUT)
			break;
		mdelay(1);			/* Do we really need this */
	}

	switch(status) {
	/* Config read from EEPROM succeeded */
	case SXG_CFG_LOAD_EEPROM:
	/* Config read from Flash succeeded */
	case SXG_CFG_LOAD_FLASH:
		/*
		 * Copy the MAC address to adapter structure
		 * TODO: We are not doing the remaining part : FRU, etc
		 */
		memcpy(adapter->macaddr, data->MacAddr[0].MacAddr,
			sizeof(struct sxg_config_mac));
		break;
	case SXG_CFG_TIMEOUT:
	case SXG_CFG_LOAD_INVALID:
	case SXG_CFG_LOAD_ERROR:
	default:	/* Fix default handler later */
		printk(KERN_WARNING"%s  : We could not read the config \
			word. Status = %ld\n", __FUNCTION__, status);
		break;
	}
	pci_free_consistent(adapter->pcidev, sizeof(struct sw_cfg_data), data,
				p_addr);
	if (adapter->netdev) {
		memcpy(adapter->netdev->dev_addr, adapter->currmacaddr, 6);
		memcpy(adapter->netdev->perm_addr, adapter->currmacaddr, 6);
	}
	sxg_dbg_macaddrs(adapter);

	return status;
}

static const struct net_device_ops sxg_netdev_ops = {
	.ndo_open		= sxg_entry_open,
	.ndo_stop		= sxg_entry_halt,
	.ndo_start_xmit		= sxg_send_packets,
	.ndo_do_ioctl		= sxg_ioctl,
	.ndo_change_mtu		= sxg_change_mtu,
	.ndo_get_stats		= sxg_get_stats,
	.ndo_set_multicast_list	= sxg_mcast_set_list,
	.ndo_validate_addr	= eth_validate_addr,
#if XXXTODO
	.ndo_set_mac_address	= sxg_mac_set_address,
#else
	.ndo_set_mac_address	= eth_mac_addr,
#endif
};

static int sxg_entry_probe(struct pci_dev *pcidev,
			   const struct pci_device_id *pci_tbl_entry)
{
	static int did_version = 0;
	int err;
	struct net_device *netdev;
	struct adapter_t *adapter;
	void __iomem *memmapped_ioaddr;
	u32 status = 0;
	ulong mmio_start = 0;
	ulong mmio_len = 0;
	unsigned char revision_id;

	DBG_ERROR("sxg: %s 2.6 VERSION ENTER jiffies[%lx] cpu %d\n",
		  __func__, jiffies, smp_processor_id());

	/* Initialize trace buffer */
#ifdef ATKDBG
	SxgTraceBuffer = &LSxgTraceBuffer;
	SXG_TRACE_INIT(SxgTraceBuffer, TRACE_NOISY);
#endif

	sxg_global.dynamic_intagg = dynamic_intagg;

	err = pci_enable_device(pcidev);

	DBG_ERROR("Call pci_enable_device(%p)  status[%x]\n", pcidev, err);
	if (err) {
		return err;
	}

	if (sxg_debug > 0 && did_version++ == 0) {
		printk(KERN_INFO "%s\n", sxg_banner);
		printk(KERN_INFO "%s\n", SXG_DRV_VERSION);
	}

	pci_read_config_byte(pcidev, PCI_REVISION_ID, &revision_id);

	if (!(err = pci_set_dma_mask(pcidev, DMA_BIT_MASK(64)))) {
		DBG_ERROR("pci_set_dma_mask(DMA_BIT_MASK(64)) successful\n");
	} else {
		if ((err = pci_set_dma_mask(pcidev, DMA_BIT_MASK(32)))) {
			DBG_ERROR
			    ("No usable DMA configuration, aborting  err[%x]\n",
			     err);
			return err;
		}
		DBG_ERROR("pci_set_dma_mask(DMA_BIT_MASK(32)) successful\n");
	}

	DBG_ERROR("Call pci_request_regions\n");

	err = pci_request_regions(pcidev, sxg_driver_name);
	if (err) {
		DBG_ERROR("pci_request_regions FAILED err[%x]\n", err);
		return err;
	}

	DBG_ERROR("call pci_set_master\n");
	pci_set_master(pcidev);

	DBG_ERROR("call alloc_etherdev\n");
	netdev = alloc_etherdev(sizeof(struct adapter_t));
	if (!netdev) {
		err = -ENOMEM;
		goto err_out_exit_sxg_probe;
	}
	DBG_ERROR("alloc_etherdev for slic netdev[%p]\n", netdev);

	SET_NETDEV_DEV(netdev, &pcidev->dev);

	pci_set_drvdata(pcidev, netdev);
	adapter = netdev_priv(netdev);
	if (revision_id == 1) {
		adapter->asictype = SAHARA_REV_A;
	} else if (revision_id == 2) {
		adapter->asictype = SAHARA_REV_B;
	} else {
		ASSERT(0);
		DBG_ERROR("%s Unexpected revision ID %x\n", __FUNCTION__, revision_id);
		goto err_out_exit_sxg_probe;
	}
	adapter->netdev = netdev;
	adapter->pcidev = pcidev;

	mmio_start = pci_resource_start(pcidev, 0);
	mmio_len = pci_resource_len(pcidev, 0);

	DBG_ERROR("sxg: call ioremap(mmio_start[%lx], mmio_len[%lx])\n",
		  mmio_start, mmio_len);

	memmapped_ioaddr = ioremap(mmio_start, mmio_len);
	DBG_ERROR("sxg: %s MEMMAPPED_IOADDR [%p]\n", __func__,
		  memmapped_ioaddr);
	if (!memmapped_ioaddr) {
		DBG_ERROR("%s cannot remap MMIO region %lx @ %lx\n",
			  __func__, mmio_len, mmio_start);
		goto err_out_free_mmio_region_0;
	}

	DBG_ERROR("sxg: %s found Alacritech SXG PCI, MMIO at %p, start[%lx] \
	      len[%lx], IRQ %d.\n", __func__, memmapped_ioaddr, mmio_start,
					      mmio_len, pcidev->irq);

	adapter->HwRegs = (void *)memmapped_ioaddr;
	adapter->base_addr = memmapped_ioaddr;

	mmio_start = pci_resource_start(pcidev, 2);
	mmio_len = pci_resource_len(pcidev, 2);

	DBG_ERROR("sxg: call ioremap(mmio_start[%lx], mmio_len[%lx])\n",
		  mmio_start, mmio_len);

	memmapped_ioaddr = ioremap(mmio_start, mmio_len);
	DBG_ERROR("sxg: %s MEMMAPPED_IOADDR [%p]\n", __func__,
		  memmapped_ioaddr);
	if (!memmapped_ioaddr) {
		DBG_ERROR("%s cannot remap MMIO region %lx @ %lx\n",
			  __func__, mmio_len, mmio_start);
		goto err_out_free_mmio_region_2;
	}

	DBG_ERROR("sxg: %s found Alacritech SXG PCI, MMIO at %p, "
		  "start[%lx] len[%lx], IRQ %d.\n", __func__,
		  memmapped_ioaddr, mmio_start, mmio_len, pcidev->irq);

	adapter->UcodeRegs = (void *)memmapped_ioaddr;

	adapter->State = SXG_STATE_INITIALIZING;
	/*
	 * Maintain a list of all adapters anchored by
	 * the global SxgDriver structure.
	 */
	adapter->Next = SxgDriver.Adapters;
	SxgDriver.Adapters = adapter;
	adapter->AdapterID = ++SxgDriver.AdapterID;

	/* Initialize CRC table used to determine multicast hash */
	sxg_mcast_init_crc32();

	adapter->JumboEnabled = FALSE;
	adapter->RssEnabled = FALSE;
	if (adapter->JumboEnabled) {
		adapter->FrameSize = JUMBOMAXFRAME;
		adapter->ReceiveBufferSize = SXG_RCV_JUMBO_BUFFER_SIZE;
	} else {
		adapter->FrameSize = ETHERMAXFRAME;
		adapter->ReceiveBufferSize = SXG_RCV_DATA_BUFFER_SIZE;
	}

	/*
	 *    status = SXG_READ_EEPROM(adapter);
	 *    if (!status) {
	 *        goto sxg_init_bad;
	 *    }
	 */

	DBG_ERROR("sxg: %s ENTER sxg_config_pci\n", __func__);
	sxg_config_pci(pcidev);
	DBG_ERROR("sxg: %s EXIT sxg_config_pci\n", __func__);

	DBG_ERROR("sxg: %s ENTER sxg_init_driver\n", __func__);
	sxg_init_driver();
	DBG_ERROR("sxg: %s EXIT sxg_init_driver\n", __func__);

	adapter->vendid = pci_tbl_entry->vendor;
	adapter->devid = pci_tbl_entry->device;
	adapter->subsysid = pci_tbl_entry->subdevice;
	adapter->slotnumber = ((pcidev->devfn >> 3) & 0x1F);
	adapter->functionnumber = (pcidev->devfn & 0x7);
	adapter->memorylength = pci_resource_len(pcidev, 0);
	adapter->irq = pcidev->irq;
	adapter->next_netdevice = head_netdevice;
	head_netdevice = netdev;
	adapter->port = 0;	/*adapter->functionnumber; */

	/* Allocate memory and other resources */
	DBG_ERROR("sxg: %s ENTER sxg_allocate_resources\n", __func__);
	status = sxg_allocate_resources(adapter);
	DBG_ERROR("sxg: %s EXIT sxg_allocate_resources status %x\n",
		  __func__, status);
	if (status != STATUS_SUCCESS) {
		goto err_out_unmap;
	}

	DBG_ERROR("sxg: %s ENTER sxg_download_microcode\n", __func__);
	if (sxg_download_microcode(adapter, SXG_UCODE_SYSTEM)) {
		DBG_ERROR("sxg: %s ENTER sxg_adapter_set_hwaddr\n",
			  __func__);
		sxg_read_config(adapter);
		status = sxg_adapter_set_hwaddr(adapter);
	} else {
		adapter->state = ADAPT_FAIL;
		adapter->linkstate = LINK_DOWN;
		DBG_ERROR("sxg_download_microcode FAILED status[%x]\n", status);
	}

	netdev->base_addr = (unsigned long)adapter->base_addr;
	netdev->irq = adapter->irq;
	netdev->netdev_ops = &sxg_netdev_ops;
	SET_ETHTOOL_OPS(netdev, &sxg_nic_ethtool_ops);
 	netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
	err = sxg_set_interrupt_capability(adapter);
	if (err != STATUS_SUCCESS)
		DBG_ERROR("Cannot enable MSI-X capability\n");

	strcpy(netdev->name, "eth%d");
	/*  strcpy(netdev->name, pci_name(pcidev)); */
	if ((err = register_netdev(netdev))) {
		DBG_ERROR("Cannot register net device, aborting. %s\n",
			  netdev->name);
		goto err_out_unmap;
	}

	netif_napi_add(netdev, &adapter->napi,
		sxg_poll, SXG_NETDEV_WEIGHT);
	netdev->watchdog_timeo = 2 * HZ;
	init_timer(&adapter->watchdog_timer);
	adapter->watchdog_timer.function = &sxg_watchdog;
	adapter->watchdog_timer.data = (unsigned long) adapter;
	INIT_WORK(&adapter->update_link_status, sxg_update_link_status);

	DBG_ERROR
	    ("sxg: %s addr 0x%lx, irq %d, MAC addr \
		%02X:%02X:%02X:%02X:%02X:%02X\n",
	     netdev->name, netdev->base_addr, pcidev->irq, netdev->dev_addr[0],
	     netdev->dev_addr[1], netdev->dev_addr[2], netdev->dev_addr[3],
	     netdev->dev_addr[4], netdev->dev_addr[5]);

	/* sxg_init_bad: */
	ASSERT(status == FALSE);
	/* sxg_free_adapter(adapter); */

	DBG_ERROR("sxg: %s EXIT status[%x] jiffies[%lx] cpu %d\n", __func__,
		  status, jiffies, smp_processor_id());
	return status;

      err_out_unmap:
	sxg_free_resources(adapter);

      err_out_free_mmio_region_2:

	mmio_start = pci_resource_start(pcidev, 2);
        mmio_len = pci_resource_len(pcidev, 2);
	release_mem_region(mmio_start, mmio_len);

      err_out_free_mmio_region_0:

        mmio_start = pci_resource_start(pcidev, 0);
        mmio_len = pci_resource_len(pcidev, 0);

	release_mem_region(mmio_start, mmio_len);

      err_out_exit_sxg_probe:

	DBG_ERROR("%s EXIT jiffies[%lx] cpu %d\n", __func__, jiffies,
		  smp_processor_id());

	pci_disable_device(pcidev);
        DBG_ERROR("sxg: %s deallocate device\n", __FUNCTION__);
        kfree(netdev);
	printk("Exit %s, Sxg driver loading failed..\n", __FUNCTION__);

	return -ENODEV;
}

/*
 * LINE BASE Interrupt routines..
 *
 * sxg_disable_interrupt
 *
 * DisableInterrupt Handler
 *
 * Arguments:
 *
 *   adapter:	Our adapter structure
 *
 * Return Value:
 * 	None.
 */
static void sxg_disable_interrupt(struct adapter_t *adapter)
{
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DisIntr",
		  adapter, adapter->InterruptsEnabled, 0, 0);
	/* For now, RSS is disabled with line based interrupts */
	ASSERT(adapter->RssEnabled == FALSE);
	/* Turn off interrupts by writing to the icr register. */
	WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_DISABLE), TRUE);

	adapter->InterruptsEnabled = 0;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XDisIntr",
		  adapter, adapter->InterruptsEnabled, 0, 0);
}

/*
 * sxg_enable_interrupt
 *
 * EnableInterrupt Handler
 *
 * Arguments:
 *
 *   adapter:	Our adapter structure
 *
 * Return Value:
 * 	None.
 */
static void sxg_enable_interrupt(struct adapter_t *adapter)
{
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "EnIntr",
		  adapter, adapter->InterruptsEnabled, 0, 0);
	/* For now, RSS is disabled with line based interrupts */
	ASSERT(adapter->RssEnabled == FALSE);
	/* Turn on interrupts by writing to the icr register. */
	WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_ENABLE), TRUE);

	adapter->InterruptsEnabled = 1;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XEnIntr",
		  adapter, 0, 0, 0);
}

/*
 * sxg_isr - Process an line-based interrupt
 *
 * Arguments:
 * 		Context		- Our adapter structure
 *		QueueDefault 	- Output parameter to queue to default CPU
 *		TargetCpus	- Output bitmap to schedule DPC's
 *
 * Return Value: TRUE if our interrupt
 */
static irqreturn_t sxg_isr(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);

	if(adapter->state != ADAPT_UP)
		return IRQ_NONE;
	adapter->Stats.NumInts++;
	if (adapter->Isr[0] == 0) {
		/*
		 * The SLIC driver used to experience a number of spurious
		 * interrupts due to the delay associated with the masking of
		 * the interrupt (we'd bounce back in here).  If we see that
		 * again with Sahara,add a READ_REG of the Icr register after
		 * the WRITE_REG below.
		 */
		adapter->Stats.FalseInts++;
		return IRQ_NONE;
	}
	/*
	 * Move the Isr contents and clear the value in
	 * shared memory, and mask interrupts
	 */
	/* ASSERT(adapter->IsrDpcsPending == 0); */
#if XXXTODO			/* RSS Stuff */
	/*
	 * If RSS is enabled and the ISR specifies SXG_ISR_EVENT, then
	 * schedule DPC's based on event queues.
	 */
	if (adapter->RssEnabled && (adapter->IsrCopy[0] & SXG_ISR_EVENT)) {
		for (i = 0;
		     i < adapter->RssSystemInfo->ProcessorInfo.RssCpuCount;
		     i++) {
			struct sxg_event_ring *EventRing =
						&adapter->EventRings[i];
			struct sxg_event *Event =
			    &EventRing->Ring[adapter->NextEvent[i]];
			unsigned char Cpu =
			    adapter->RssSystemInfo->RssIdToCpu[i];
			if (Event->Status & EVENT_STATUS_VALID) {
				adapter->IsrDpcsPending++;
				CpuMask |= (1 << Cpu);
			}
		}
	}
	/*
	 * Now, either schedule the CPUs specified by the CpuMask,
	 * or queue default
	 */
	if (CpuMask) {
		*QueueDefault = FALSE;
	} else {
		adapter->IsrDpcsPending = 1;
		*QueueDefault = TRUE;
	}
	*TargetCpus = CpuMask;
#endif
	sxg_interrupt(adapter);

	return IRQ_HANDLED;
}

static void sxg_interrupt(struct adapter_t *adapter)
{
	WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_MASK), TRUE);

	if (napi_schedule_prep(&adapter->napi)) {
		__napi_schedule(&adapter->napi);
	}
}

static void sxg_handle_interrupt(struct adapter_t *adapter, int *work_done,
					 int budget)
{
	/* unsigned char           RssId   = 0; */
	u32 NewIsr;
	int sxg_napi_continue = 1;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "HndlIntr",
		  adapter, adapter->IsrCopy[0], 0, 0);
	/* For now, RSS is disabled with line based interrupts */
	ASSERT(adapter->RssEnabled == FALSE);

	adapter->IsrCopy[0] = adapter->Isr[0];
	adapter->Isr[0] = 0;

	/* Always process the event queue. */
	while (sxg_napi_continue)
	{
		sxg_process_event_queue(adapter,
				(adapter->RssEnabled ? /*RssId */ 0 : 0),
				 &sxg_napi_continue, work_done, budget);
	}

#if XXXTODO			/* RSS stuff */
	if (--adapter->IsrDpcsPending) {
		/* We're done. */
		ASSERT(adapter->RssEnabled);
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DPCsPend",
			  adapter, 0, 0, 0);
		return;
	}
#endif
	/* Last (or only) DPC processes the ISR and clears the interrupt. */
	NewIsr = sxg_process_isr(adapter, 0);
	/* Reenable interrupts */
	adapter->IsrCopy[0] = 0;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "ClearIsr",
		  adapter, NewIsr, 0, 0);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XHndlInt",
		  adapter, 0, 0, 0);
}
static int sxg_poll(struct napi_struct *napi, int budget)
{
	struct adapter_t *adapter = container_of(napi, struct adapter_t, napi);
	int work_done = 0;

	sxg_handle_interrupt(adapter, &work_done, budget);

	if (work_done < budget) {
		napi_complete(napi);
		WRITE_REG(adapter->UcodeRegs[0].Isr, 0, TRUE);
	}
	return work_done;
}

/*
 * sxg_process_isr - Process an interrupt.  Called from the line-based and
 *			message based interrupt DPC routines
 *
 * Arguments:
 * 		adapter			- Our adapter structure
 *		Queue			- The ISR that needs processing
 *
 * Return Value:
 * 	None
 */
static int sxg_process_isr(struct adapter_t *adapter, u32 MessageId)
{
	u32 Isr = adapter->IsrCopy[MessageId];
	u32 NewIsr = 0;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "ProcIsr",
		  adapter, Isr, 0, 0);

	/* Error */
	if (Isr & SXG_ISR_ERR) {
		if (Isr & SXG_ISR_PDQF) {
			adapter->Stats.PdqFull++;
			DBG_ERROR("%s: SXG_ISR_ERR  PDQF!!\n", __func__);
		}
		/* No host buffer */
		if (Isr & SXG_ISR_RMISS) {
			/*
			 * There is a bunch of code in the SLIC driver which
			 * attempts to process more receive events per DPC
			 * if we start to fall behind.  We'll probablyd
			 * need to do something similar here, but hold
			 * off for now.  I don't want to make the code more
			 * complicated than strictly needed.
			 */
			adapter->stats.rx_missed_errors++;
 			if (adapter->stats.rx_missed_errors< 5) {
				DBG_ERROR("%s: SXG_ISR_ERR  RMISS!!\n",
					  __func__);
			}
		}
		/* Card crash */
		if (Isr & SXG_ISR_DEAD) {
			/*
			 * Set aside the crash info and set the adapter state
 			 * to RESET
 			 */
			adapter->CrashCpu = (unsigned char)
				((Isr & SXG_ISR_CPU) >> SXG_ISR_CPU_SHIFT);
			adapter->CrashLocation = (ushort) (Isr & SXG_ISR_CRASH);
			adapter->Dead = TRUE;
			DBG_ERROR("%s: ISR_DEAD %x, CPU: %d\n", __func__,
				  adapter->CrashLocation, adapter->CrashCpu);
		}
		/* Event ring full */
		if (Isr & SXG_ISR_ERFULL) {
			/*
			 * Same issue as RMISS, really.  This means the
			 * host is falling behind the card.  Need to increase
			 * event ring size, process more events per interrupt,
			 * and/or reduce/remove interrupt aggregation.
			 */
			adapter->Stats.EventRingFull++;
			DBG_ERROR("%s: SXG_ISR_ERR  EVENT RING FULL!!\n",
				  __func__);
		}
		/* Transmit drop - no DRAM buffers or XMT error */
		if (Isr & SXG_ISR_XDROP) {
			DBG_ERROR("%s: SXG_ISR_ERR  XDROP!!\n", __func__);
		}
	}
	/* Slowpath send completions */
	if (Isr & SXG_ISR_SPSEND) {
		sxg_complete_slow_send(adapter);
	}
	/* Dump */
	if (Isr & SXG_ISR_UPC) {
		/* Maybe change when debug is added.. */
//		ASSERT(adapter->DumpCmdRunning);
		adapter->DumpCmdRunning = FALSE;
	}
	/* Link event */
	if (Isr & SXG_ISR_LINK) {
		if (adapter->state != ADAPT_DOWN) {
			adapter->link_status_changed = 1;
			schedule_work(&adapter->update_link_status);
		}
	}
	/* Debug - breakpoint hit */
	if (Isr & SXG_ISR_BREAK) {
		/*
		 * At the moment AGDB isn't written to support interactive
		 * debug sessions.  When it is, this interrupt will be used to
		 * signal AGDB that it has hit a breakpoint.  For now, ASSERT.
		 */
		ASSERT(0);
	}
	/* Heartbeat response */
	if (Isr & SXG_ISR_PING) {
		adapter->PingOutstanding = FALSE;
	}
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XProcIsr",
		  adapter, Isr, NewIsr, 0);

	return (NewIsr);
}

/*
 * sxg_rcv_checksum - Set the checksum for received packet
 *
 * Arguements:
 * 		@adapter - Adapter structure on which packet is received
 * 		@skb - Packet which is receieved
 * 		@Event - Event read from hardware
 */

void sxg_rcv_checksum(struct adapter_t *adapter, struct sk_buff *skb,
			 struct sxg_event *Event)
{
	skb->ip_summed = CHECKSUM_NONE;
	if (likely(adapter->flags & SXG_RCV_IP_CSUM_ENABLED)) {
		if (likely(adapter->flags & SXG_RCV_TCP_CSUM_ENABLED)
			&& (Event->Status & EVENT_STATUS_TCPIP)) {
			if(!(Event->Status & EVENT_STATUS_TCPBAD))
				skb->ip_summed = CHECKSUM_UNNECESSARY;
		if(!(Event->Status & EVENT_STATUS_IPBAD))
			skb->ip_summed = CHECKSUM_UNNECESSARY;
		} else if(Event->Status & EVENT_STATUS_IPONLY) {
			if(!(Event->Status & EVENT_STATUS_IPBAD))
				skb->ip_summed = CHECKSUM_UNNECESSARY;
		}
	}
}

/*
 * sxg_process_event_queue - Process our event queue
 *
 * Arguments:
 * 		- adapter	- Adapter structure
 *		- RssId		- The event queue requiring processing
 *
 * Return Value:
 * 	None.
 */
static u32 sxg_process_event_queue(struct adapter_t *adapter, u32 RssId,
			 int *sxg_napi_continue, int *work_done, int budget)
{
	struct sxg_event_ring *EventRing = &adapter->EventRings[RssId];
	struct sxg_event *Event = &EventRing->Ring[adapter->NextEvent[RssId]];
	u32 EventsProcessed = 0, Batches = 0;
	struct sk_buff *skb;
#ifdef LINUX_HANDLES_RCV_INDICATION_LISTS
	struct sk_buff *prev_skb = NULL;
	struct sk_buff *IndicationList[SXG_RCV_ARRAYSIZE];
	u32 Index;
	struct sxg_rcv_data_buffer_hdr *RcvDataBufferHdr;
#endif
	u32 ReturnStatus = 0;
	int sxg_rcv_data_buffers = SXG_RCV_DATA_BUFFERS;

	ASSERT((adapter->State == SXG_STATE_RUNNING) ||
	       (adapter->State == SXG_STATE_PAUSING) ||
	       (adapter->State == SXG_STATE_PAUSED) ||
	       (adapter->State == SXG_STATE_HALTING));
	/*
	 * We may still have unprocessed events on the queue if
	 * the card crashed.  Don't process them.
	 */
	if (adapter->Dead) {
		return (0);
	}
	/*
	 *  In theory there should only be a single processor that
	 * accesses this queue, and only at interrupt-DPC time.  So/
	 * we shouldn't need a lock for any of this.
	 */
	while (Event->Status & EVENT_STATUS_VALID) {
		(*sxg_napi_continue) = 1;
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "Event",
			  Event, Event->Code, Event->Status,
			  adapter->NextEvent);
		switch (Event->Code) {
		case EVENT_CODE_BUFFERS:
			/* struct sxg_ring_info Head & Tail == unsigned char */
			ASSERT(!(Event->CommandIndex & 0xFF00));
			sxg_complete_descriptor_blocks(adapter,
						       Event->CommandIndex);
			break;
		case EVENT_CODE_SLOWRCV:
			(*work_done)++;
			--adapter->RcvBuffersOnCard;
			if ((skb = sxg_slow_receive(adapter, Event))) {
				u32 rx_bytes;
#ifdef LINUX_HANDLES_RCV_INDICATION_LISTS
				/* Add it to our indication list */
				SXG_ADD_RCV_PACKET(adapter, skb, prev_skb,
						   IndicationList, num_skbs);
				/*
				 * Linux, we just pass up each skb to the
				 * protocol above at this point, there is no
				 * capability of an indication list.
				 */
#else
				/* CHECK skb_pull(skb, INIC_RCVBUF_HEADSIZE); */
				/* (rcvbuf->length & IRHDDR_FLEN_MSK); */
				rx_bytes = Event->Length;
				adapter->stats.rx_packets++;
				adapter->stats.rx_bytes += rx_bytes;
				sxg_rcv_checksum(adapter, skb, Event);
				skb->dev = adapter->netdev;
				netif_receive_skb(skb);
#endif
			}
			break;
		default:
			DBG_ERROR("%s: ERROR  Invalid EventCode %d\n",
				  __func__, Event->Code);
		/* ASSERT(0); */
		}
		/*
		 * See if we need to restock card receive buffers.
		 * There are two things to note here:
		 *  First - This test is not SMP safe.  The
		 *    adapter->BuffersOnCard field is protected via atomic
		 *    interlocked calls, but we do not protect it with respect
		 *    to these tests.  The only way to do that is with a lock,
		 *    and I don't want to grab a lock every time we adjust the
		 *    BuffersOnCard count.  Instead, we allow the buffer
		 *    replenishment to be off once in a while. The worst that
		 *    can happen is the card is given on more-or-less descriptor
		 *    block than the arbitrary value we've chosen. No big deal
		 *    In short DO NOT ADD A LOCK HERE, OR WHERE RcvBuffersOnCard
		 *    is adjusted.
		 *  Second - We expect this test to rarely
		 *    evaluate to true.  We attempt to refill descriptor blocks
		 *    as they are returned to us (sxg_complete_descriptor_blocks)
		 *    so The only time this should evaluate to true is when
		 *    sxg_complete_descriptor_blocks failed to allocate
		 *    receive buffers.
		 */
		if (adapter->JumboEnabled)
			sxg_rcv_data_buffers = SXG_JUMBO_RCV_DATA_BUFFERS;

		if (adapter->RcvBuffersOnCard < sxg_rcv_data_buffers) {
			sxg_stock_rcv_buffers(adapter);
		}
		/*
		 * It's more efficient to just set this to zero.
		 * But clearing the top bit saves potential debug info...
		 */
		Event->Status &= ~EVENT_STATUS_VALID;
		/* Advance to the next event */
		SXG_ADVANCE_INDEX(adapter->NextEvent[RssId], EVENT_RING_SIZE);
		Event = &EventRing->Ring[adapter->NextEvent[RssId]];
		EventsProcessed++;
		if (EventsProcessed == EVENT_RING_BATCH) {
			/* Release a batch of events back to the card */
			WRITE_REG(adapter->UcodeRegs[RssId].EventRelease,
				  EVENT_RING_BATCH, FALSE);
			EventsProcessed = 0;
			/*
			 * If we've processed our batch limit, break out of the
			 * loop and return SXG_ISR_EVENT to arrange for us to
			 * be called again
			 */
			if (Batches++ == EVENT_BATCH_LIMIT) {
				SXG_TRACE(TRACE_SXG, SxgTraceBuffer,
					  TRACE_NOISY, "EvtLimit", Batches,
					  adapter->NextEvent, 0, 0);
				ReturnStatus = SXG_ISR_EVENT;
				break;
			}
		}
		if (*work_done >= budget) {
			WRITE_REG(adapter->UcodeRegs[RssId].EventRelease,
				  EventsProcessed, FALSE);
			EventsProcessed = 0;
			(*sxg_napi_continue) = 0;
			break;
		}
	}
	if (!(Event->Status & EVENT_STATUS_VALID))
		(*sxg_napi_continue) = 0;

#ifdef LINUX_HANDLES_RCV_INDICATION_LISTS
	/* Indicate any received dumb-nic frames */
	SXG_INDICATE_PACKETS(adapter, IndicationList, num_skbs);
#endif
	/* Release events back to the card. */
	if (EventsProcessed) {
		WRITE_REG(adapter->UcodeRegs[RssId].EventRelease,
			  EventsProcessed, FALSE);
	}
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XPrcEvnt",
		  Batches, EventsProcessed, adapter->NextEvent, num_skbs);

	return (ReturnStatus);
}

/*
 * sxg_complete_slow_send - Complete slowpath or dumb-nic sends
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 * Return
 *	None
 */
static void sxg_complete_slow_send(struct adapter_t *adapter)
{
	struct sxg_xmt_ring *XmtRing = &adapter->XmtRings[0];
	struct sxg_ring_info *XmtRingInfo = &adapter->XmtRingZeroInfo;
	u32 *ContextType;
	struct sxg_cmd *XmtCmd;
	unsigned long flags = 0;
	unsigned long sgl_flags = 0;
	unsigned int processed_count = 0;

	/*
	 * NOTE - This lock is dropped and regrabbed in this loop.
	 * This means two different processors can both be running/
	 * through this loop. Be *very* careful.
	 */
	spin_lock_irqsave(&adapter->XmtZeroLock, flags);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "CmpSnds",
		  adapter, XmtRingInfo->Head, XmtRingInfo->Tail, 0);

	while ((XmtRingInfo->Tail != *adapter->XmtRingZeroIndex)
		&& processed_count++ < SXG_COMPLETE_SLOW_SEND_LIMIT)  {
		/*
		 * Locate the current Cmd (ring descriptor entry), and
		 * associated SGL, and advance the tail
		 */
		SXG_RETURN_CMD(XmtRing, XmtRingInfo, XmtCmd, ContextType);
		ASSERT(ContextType);
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "CmpSnd",
			  XmtRingInfo->Head, XmtRingInfo->Tail, XmtCmd, 0);
		/* Clear the SGL field. */
		XmtCmd->Sgl = 0;

		switch (*ContextType) {
		case SXG_SGL_DUMB:
			{
				struct sk_buff *skb;
				struct sxg_scatter_gather *SxgSgl =
					(struct sxg_scatter_gather *)ContextType;
				dma64_addr_t FirstSgeAddress;
				u32 FirstSgeLength;

				/* Dumb-nic send.  Command context is the dumb-nic SGL */
				skb = (struct sk_buff *)ContextType;
				skb = SxgSgl->DumbPacket;
				FirstSgeAddress = XmtCmd->Buffer.FirstSgeAddress;
				FirstSgeLength = XmtCmd->Buffer.FirstSgeLength;
				/* Complete the send */
				SXG_TRACE(TRACE_SXG, SxgTraceBuffer,
					  TRACE_IMPORTANT, "DmSndCmp", skb, 0,
					  0, 0);
				ASSERT(adapter->Stats.XmtQLen);
				/*
				 * Now drop the lock and complete the send
				 * back to Microsoft.  We need to drop the lock
				 * because Microsoft can come back with a
				 * chimney send, which results in a double trip
				 * in SxgTcpOuput
				 */
				spin_unlock_irqrestore(
					&adapter->XmtZeroLock, flags);

				SxgSgl->DumbPacket = NULL;
				SXG_COMPLETE_DUMB_SEND(adapter, skb,
							FirstSgeAddress,
							FirstSgeLength);
				SXG_FREE_SGL_BUFFER(adapter, SxgSgl, NULL);
				/* and reacquire.. */
				spin_lock_irqsave(&adapter->XmtZeroLock, flags);
			}
			break;
		default:
			ASSERT(0);
		}
	}
	spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "CmpSnd",
		  adapter, XmtRingInfo->Head, XmtRingInfo->Tail, 0);
}

/*
 * sxg_slow_receive
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *	Event		- Receive event
 *
 * Return - skb
 */
static struct sk_buff *sxg_slow_receive(struct adapter_t *adapter,
						struct sxg_event *Event)
{
	u32 BufferSize = adapter->ReceiveBufferSize;
	struct sxg_rcv_data_buffer_hdr *RcvDataBufferHdr;
	struct sk_buff *Packet;
	static int read_counter = 0;

	RcvDataBufferHdr = (struct sxg_rcv_data_buffer_hdr *) Event->HostHandle;
	if(read_counter++ & 0x100)
	{
		sxg_collect_statistics(adapter);
		read_counter = 0;
	}
	ASSERT(RcvDataBufferHdr);
	ASSERT(RcvDataBufferHdr->State == SXG_BUFFER_ONCARD);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "SlowRcv", Event,
		  RcvDataBufferHdr, RcvDataBufferHdr->State,
		  /*RcvDataBufferHdr->VirtualAddress*/ 0);
	/* Drop rcv frames in non-running state */
	switch (adapter->State) {
	case SXG_STATE_RUNNING:
		break;
	case SXG_STATE_PAUSING:
	case SXG_STATE_PAUSED:
	case SXG_STATE_HALTING:
		goto drop;
	default:
		ASSERT(0);
		goto drop;
	}

	/*
	 * memcpy(SXG_RECEIVE_DATA_LOCATION(RcvDataBufferHdr),
	 * 		RcvDataBufferHdr->VirtualAddress, Event->Length);
	 */

	/* Change buffer state to UPSTREAM */
	RcvDataBufferHdr->State = SXG_BUFFER_UPSTREAM;
	if (Event->Status & EVENT_STATUS_RCVERR) {
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "RcvError",
			  Event, Event->Status, Event->HostHandle, 0);
		sxg_process_rcv_error(adapter, *(u32 *)
				      SXG_RECEIVE_DATA_LOCATION
				      (RcvDataBufferHdr));
		goto drop;
	}
#if XXXTODO			/* VLAN stuff */
	/* If there's a VLAN tag, extract it and validate it */
	if (((struct ether_header *)
		(SXG_RECEIVE_DATA_LOCATION(RcvDataBufferHdr)))->EtherType
							== ETHERTYPE_VLAN) {
		if (SxgExtractVlanHeader(adapter, RcvDataBufferHdr, Event) !=
		    STATUS_SUCCESS) {
			SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY,
				  "BadVlan", Event,
				  SXG_RECEIVE_DATA_LOCATION(RcvDataBufferHdr),
				  Event->Length, 0);
			goto drop;
		}
	}
#endif
	/* Dumb-nic frame.  See if it passes our mac filter and update stats */

	if (!sxg_mac_filter(adapter,
	    (struct ether_header *)(SXG_RECEIVE_DATA_LOCATION(RcvDataBufferHdr)),
	    Event->Length)) {
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "RcvFiltr",
			    Event, SXG_RECEIVE_DATA_LOCATION(RcvDataBufferHdr),
			    Event->Length, 0);
	  goto drop;
	}

	Packet = RcvDataBufferHdr->SxgDumbRcvPacket;
	SXG_ADJUST_RCV_PACKET(Packet, RcvDataBufferHdr, Event);
	Packet->protocol = eth_type_trans(Packet, adapter->netdev);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "DumbRcv",
		  RcvDataBufferHdr, Packet, Event->Length, 0);
	/* Lastly adjust the receive packet length. */
	RcvDataBufferHdr->SxgDumbRcvPacket = NULL;
	RcvDataBufferHdr->PhysicalAddress = (dma_addr_t)NULL;
	SXG_ALLOCATE_RCV_PACKET(adapter, RcvDataBufferHdr, BufferSize);
	if (RcvDataBufferHdr->skb)
	{
		spin_lock(&adapter->RcvQLock);
		SXG_FREE_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr);
		// adapter->RcvBuffersOnCard ++;
		spin_unlock(&adapter->RcvQLock);
	}
	return (Packet);

      drop:
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DropRcv",
		  RcvDataBufferHdr, Event->Length, 0, 0);
	adapter->stats.rx_dropped++;
//	adapter->Stats.RcvDiscards++;
	spin_lock(&adapter->RcvQLock);
	SXG_FREE_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr);
	spin_unlock(&adapter->RcvQLock);
	return (NULL);
}

/*
 * sxg_process_rcv_error - process receive error and update
 * stats
 *
 * Arguments:
 *		adapter		- Adapter structure
 *		ErrorStatus	- 4-byte receive error status
 *
 * Return Value		: None
 */
static void sxg_process_rcv_error(struct adapter_t *adapter, u32 ErrorStatus)
{
	u32 Error;

	adapter->stats.rx_errors++;

	if (ErrorStatus & SXG_RCV_STATUS_TRANSPORT_ERROR) {
		Error = ErrorStatus & SXG_RCV_STATUS_TRANSPORT_MASK;
		switch (Error) {
		case SXG_RCV_STATUS_TRANSPORT_CSUM:
			adapter->Stats.TransportCsum++;
			break;
		case SXG_RCV_STATUS_TRANSPORT_UFLOW:
			adapter->Stats.TransportUflow++;
			break;
		case SXG_RCV_STATUS_TRANSPORT_HDRLEN:
			adapter->Stats.TransportHdrLen++;
			break;
		}
	}
	if (ErrorStatus & SXG_RCV_STATUS_NETWORK_ERROR) {
		Error = ErrorStatus & SXG_RCV_STATUS_NETWORK_MASK;
		switch (Error) {
		case SXG_RCV_STATUS_NETWORK_CSUM:
			adapter->Stats.NetworkCsum++;
			break;
		case SXG_RCV_STATUS_NETWORK_UFLOW:
			adapter->Stats.NetworkUflow++;
			break;
		case SXG_RCV_STATUS_NETWORK_HDRLEN:
			adapter->Stats.NetworkHdrLen++;
			break;
		}
	}
	if (ErrorStatus & SXG_RCV_STATUS_PARITY) {
		adapter->Stats.Parity++;
	}
	if (ErrorStatus & SXG_RCV_STATUS_LINK_ERROR) {
		Error = ErrorStatus & SXG_RCV_STATUS_LINK_MASK;
		switch (Error) {
		case SXG_RCV_STATUS_LINK_PARITY:
			adapter->Stats.LinkParity++;
			break;
		case SXG_RCV_STATUS_LINK_EARLY:
			adapter->Stats.LinkEarly++;
			break;
		case SXG_RCV_STATUS_LINK_BUFOFLOW:
			adapter->Stats.LinkBufOflow++;
			break;
		case SXG_RCV_STATUS_LINK_CODE:
			adapter->Stats.LinkCode++;
			break;
		case SXG_RCV_STATUS_LINK_DRIBBLE:
			adapter->Stats.LinkDribble++;
			break;
		case SXG_RCV_STATUS_LINK_CRC:
			adapter->Stats.LinkCrc++;
			break;
		case SXG_RCV_STATUS_LINK_OFLOW:
			adapter->Stats.LinkOflow++;
			break;
		case SXG_RCV_STATUS_LINK_UFLOW:
			adapter->Stats.LinkUflow++;
			break;
		}
	}
}

/*
 * sxg_mac_filter
 *
 * Arguments:
 *		adapter		- Adapter structure
 *		pether		- Ethernet header
 *		length		- Frame length
 *
 * Return Value : TRUE if the frame is to be allowed
 */
static bool sxg_mac_filter(struct adapter_t *adapter,
		struct ether_header *EtherHdr, ushort length)
{
	bool EqualAddr;
	struct net_device *dev = adapter->netdev;

	if (SXG_MULTICAST_PACKET(EtherHdr)) {
		if (SXG_BROADCAST_PACKET(EtherHdr)) {
			/* broadcast */
			if (adapter->MacFilter & MAC_BCAST) {
				adapter->Stats.DumbRcvBcastPkts++;
				adapter->Stats.DumbRcvBcastBytes += length;
				return (TRUE);
			}
		} else {
			/* multicast */
			if (adapter->MacFilter & MAC_ALLMCAST) {
				adapter->Stats.DumbRcvMcastPkts++;
				adapter->Stats.DumbRcvMcastBytes += length;
				return (TRUE);
			}
			if (adapter->MacFilter & MAC_MCAST) {
				struct dev_mc_list *mclist = dev->mc_list;
				while (mclist) {
					ETHER_EQ_ADDR(mclist->da_addr,
						      EtherHdr->ether_dhost,
						      EqualAddr);
					if (EqualAddr) {
						adapter->Stats.
						    DumbRcvMcastPkts++;
						adapter->Stats.
						    DumbRcvMcastBytes += length;
						return (TRUE);
					}
					mclist = mclist->next;
				}
			}
		}
	} else if (adapter->MacFilter & MAC_DIRECTED) {
		/*
		 * Not broadcast or multicast.  Must be directed at us or
		 * the card is in promiscuous mode.  Either way, consider it
		 * ours if MAC_DIRECTED is set
		 */
		adapter->Stats.DumbRcvUcastPkts++;
		adapter->Stats.DumbRcvUcastBytes += length;
		return (TRUE);
	}
	if (adapter->MacFilter & MAC_PROMISC) {
		/* Whatever it is, keep it. */
		return (TRUE);
	}
	return (FALSE);
}

static int sxg_register_interrupt(struct adapter_t *adapter)
{
	if (!adapter->intrregistered) {
		int retval;

		DBG_ERROR
		    ("sxg: %s AllocAdaptRsrcs adapter[%p] dev->irq[%x] %x\n",
		     __func__, adapter, adapter->netdev->irq, NR_IRQS);

		spin_unlock_irqrestore(&sxg_global.driver_lock,
				       sxg_global.flags);

		retval = request_irq(adapter->netdev->irq,
				     &sxg_isr,
				     IRQF_SHARED,
				     adapter->netdev->name, adapter->netdev);

		spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);

		if (retval) {
			DBG_ERROR("sxg: request_irq (%s) FAILED [%x]\n",
				  adapter->netdev->name, retval);
			return (retval);
		}
		adapter->intrregistered = 1;
		adapter->IntRegistered = TRUE;
		/* Disable RSS with line-based interrupts */
		adapter->RssEnabled = FALSE;
		DBG_ERROR("sxg: %s AllocAdaptRsrcs adapter[%p] dev->irq[%x]\n",
			  __func__, adapter, adapter->netdev->irq);
	}
	return (STATUS_SUCCESS);
}

static void sxg_deregister_interrupt(struct adapter_t *adapter)
{
	DBG_ERROR("sxg: %s ENTER adapter[%p]\n", __func__, adapter);
#if XXXTODO
	slic_init_cleanup(adapter);
#endif
	memset(&adapter->stats, 0, sizeof(struct net_device_stats));
	adapter->error_interrupts = 0;
	adapter->rcv_interrupts = 0;
	adapter->xmit_interrupts = 0;
	adapter->linkevent_interrupts = 0;
	adapter->upr_interrupts = 0;
	adapter->num_isrs = 0;
	adapter->xmit_completes = 0;
	adapter->rcv_broadcasts = 0;
	adapter->rcv_multicasts = 0;
	adapter->rcv_unicasts = 0;
	DBG_ERROR("sxg: %s EXIT\n", __func__);
}

/*
 *  sxg_if_init
 *
 *  Perform initialization of our slic interface.
 *
 */
static int sxg_if_init(struct adapter_t *adapter)
{
	struct net_device *dev = adapter->netdev;
	int status = 0;

	DBG_ERROR("sxg: %s (%s) ENTER states[%d:%d] flags[%x]\n",
		  __func__, adapter->netdev->name,
		  adapter->state,
		  adapter->linkstate, dev->flags);

	/* adapter should be down at this point */
	if (adapter->state != ADAPT_DOWN) {
		DBG_ERROR("sxg_if_init adapter->state != ADAPT_DOWN\n");
		return (-EIO);
	}
	ASSERT(adapter->linkstate == LINK_DOWN);

	adapter->devflags_prev = dev->flags;
	adapter->MacFilter = MAC_DIRECTED;
	if (dev->flags) {
		DBG_ERROR("sxg: %s (%s) Set MAC options: ", __func__,
			  adapter->netdev->name);
		if (dev->flags & IFF_BROADCAST) {
			adapter->MacFilter |= MAC_BCAST;
			DBG_ERROR("BCAST ");
		}
		if (dev->flags & IFF_PROMISC) {
			adapter->MacFilter |= MAC_PROMISC;
			DBG_ERROR("PROMISC ");
		}
		if (dev->flags & IFF_ALLMULTI) {
			adapter->MacFilter |= MAC_ALLMCAST;
			DBG_ERROR("ALL_MCAST ");
		}
		if (dev->flags & IFF_MULTICAST) {
			adapter->MacFilter |= MAC_MCAST;
			DBG_ERROR("MCAST ");
		}
		DBG_ERROR("\n");
	}
	status = sxg_register_intr(adapter);
	if (status != STATUS_SUCCESS) {
		DBG_ERROR("sxg_if_init: sxg_register_intr FAILED %x\n",
			  status);
		sxg_deregister_interrupt(adapter);
		return (status);
	}

	adapter->state = ADAPT_UP;

	/*    clear any pending events, then enable interrupts */
	DBG_ERROR("sxg: %s ENABLE interrupts(slic)\n", __func__);

	return (STATUS_SUCCESS);
}

void sxg_set_interrupt_aggregation(struct adapter_t *adapter)
{
	/*
	 * Top bit disables aggregation on xmt (SXG_AGG_XMT_DISABLE).
	 * Make sure Max is less than 0x8000.
	 */
	adapter->max_aggregation = SXG_MAX_AGG_DEFAULT;
	adapter->min_aggregation = SXG_MIN_AGG_DEFAULT;
	WRITE_REG(adapter->UcodeRegs[0].Aggregation,
		((adapter->max_aggregation << SXG_MAX_AGG_SHIFT) |
			adapter->min_aggregation),
			TRUE);
}

static int sxg_entry_open(struct net_device *dev)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);
	int status;
	static int turn;
	int sxg_initial_rcv_data_buffers = SXG_INITIAL_RCV_DATA_BUFFERS;
	int i;

	if (adapter->JumboEnabled == TRUE) {
		sxg_initial_rcv_data_buffers =
					SXG_INITIAL_JUMBO_RCV_DATA_BUFFERS;
		SXG_INITIALIZE_RING(adapter->RcvRingZeroInfo,
					SXG_JUMBO_RCV_RING_SIZE);
	}

	/*
	* Allocate receive data buffers.  We allocate a block of buffers and
	* a corresponding descriptor block at once.  See sxghw.h:SXG_RCV_BLOCK
	*/

	for (i = 0; i < sxg_initial_rcv_data_buffers;
			i += SXG_RCV_DESCRIPTORS_PER_BLOCK)
	{
		status = sxg_allocate_buffer_memory(adapter,
		SXG_RCV_BLOCK_SIZE(SXG_RCV_DATA_HDR_SIZE),
					SXG_BUFFER_TYPE_RCV);
		if (status != STATUS_SUCCESS)
			return status;
	}
	/*
	 * NBL resource allocation can fail in the 'AllocateComplete' routine,
	 * which doesn't return status.  Make sure we got the number of buffers
	 * we requested
	 */

	if (adapter->FreeRcvBufferCount < sxg_initial_rcv_data_buffers) {
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAResF6",
			adapter, adapter->FreeRcvBufferCount, SXG_MAX_ENTRIES,
			0);
		return (STATUS_RESOURCES);
	}
	/*
	 * The microcode expects it to be downloaded on every open.
	 */
	DBG_ERROR("sxg: %s ENTER sxg_download_microcode\n", __FUNCTION__);
	if (sxg_download_microcode(adapter, SXG_UCODE_SYSTEM)) {
		DBG_ERROR("sxg: %s ENTER sxg_adapter_set_hwaddr\n",
				__FUNCTION__);
		sxg_read_config(adapter);
	} else {
		adapter->state = ADAPT_FAIL;
		adapter->linkstate = LINK_DOWN;
		DBG_ERROR("sxg_download_microcode FAILED status[%x]\n",
				status);
	}
	msleep(5);

	if (turn) {
		sxg_second_open(adapter->netdev);

		return STATUS_SUCCESS;
	}

	turn++;

	ASSERT(adapter);
	DBG_ERROR("sxg: %s adapter->activated[%d]\n", __func__,
		  adapter->activated);
	DBG_ERROR
	    ("sxg: %s (%s): [jiffies[%lx] cpu %d] dev[%p] adapt[%p] port[%d]\n",
	     __func__, adapter->netdev->name, jiffies, smp_processor_id(),
	     adapter->netdev, adapter, adapter->port);

	netif_stop_queue(adapter->netdev);

	spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
	if (!adapter->activated) {
		sxg_global.num_sxg_ports_active++;
		adapter->activated = 1;
	}
	/* Initialize the adapter */
	DBG_ERROR("sxg: %s ENTER sxg_initialize_adapter\n", __func__);
	status = sxg_initialize_adapter(adapter);
	DBG_ERROR("sxg: %s EXIT sxg_initialize_adapter status[%x]\n",
		  __func__, status);

	if (status == STATUS_SUCCESS) {
		DBG_ERROR("sxg: %s ENTER sxg_if_init\n", __func__);
		status = sxg_if_init(adapter);
		DBG_ERROR("sxg: %s EXIT sxg_if_init status[%x]\n", __func__,
			  status);
	}

	if (status != STATUS_SUCCESS) {
		if (adapter->activated) {
			sxg_global.num_sxg_ports_active--;
			adapter->activated = 0;
		}
		spin_unlock_irqrestore(&sxg_global.driver_lock,
				       sxg_global.flags);
		return (status);
	}
	DBG_ERROR("sxg: %s ENABLE ALL INTERRUPTS\n", __func__);
	sxg_set_interrupt_aggregation(adapter);
	napi_enable(&adapter->napi);

	/* Enable interrupts */
	SXG_ENABLE_ALL_INTERRUPTS(adapter);

	DBG_ERROR("sxg: %s EXIT\n", __func__);

	spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
	mod_timer(&adapter->watchdog_timer, jiffies);

	return STATUS_SUCCESS;
}

int sxg_second_open(struct net_device * dev)
{
	struct adapter_t *adapter = (struct adapter_t*) netdev_priv(dev);
	int status = 0;

	spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
	netif_start_queue(adapter->netdev);
        adapter->state = ADAPT_UP;
        adapter->linkstate = LINK_UP;

	status = sxg_initialize_adapter(adapter);
	sxg_set_interrupt_aggregation(adapter);
	napi_enable(&adapter->napi);
        /* Re-enable interrupts */
        SXG_ENABLE_ALL_INTERRUPTS(adapter);

	sxg_register_intr(adapter);
	spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
	mod_timer(&adapter->watchdog_timer, jiffies);
	return (STATUS_SUCCESS);

}

static void __devexit sxg_entry_remove(struct pci_dev *pcidev)
{
        u32 mmio_start = 0;
        u32 mmio_len = 0;

	struct net_device *dev = pci_get_drvdata(pcidev);
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);

	flush_scheduled_work();

	/* Deallocate Resources */
	unregister_netdev(dev);
	sxg_reset_interrupt_capability(adapter);
	sxg_free_resources(adapter);

	ASSERT(adapter);

        mmio_start = pci_resource_start(pcidev, 0);
        mmio_len = pci_resource_len(pcidev, 0);

        DBG_ERROR("sxg: %s rel_region(0) start[%x] len[%x]\n", __FUNCTION__,
                  mmio_start, mmio_len);
        release_mem_region(mmio_start, mmio_len);

        mmio_start = pci_resource_start(pcidev, 2);
        mmio_len = pci_resource_len(pcidev, 2);

        DBG_ERROR("sxg: %s rel_region(2) start[%x] len[%x]\n", __FUNCTION__,
                  mmio_start, mmio_len);
        release_mem_region(mmio_start, mmio_len);

	pci_disable_device(pcidev);

	DBG_ERROR("sxg: %s deallocate device\n", __func__);
	kfree(dev);
	DBG_ERROR("sxg: %s EXIT\n", __func__);
}

static int sxg_entry_halt(struct net_device *dev)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	int i;
	u32 RssIds, IsrCount;
	unsigned long flags;

	RssIds = SXG_RSS_CPU_COUNT(adapter);
	IsrCount = adapter->msi_enabled ? RssIds : 1;
	/* Disable interrupts */
	spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
	SXG_DISABLE_ALL_INTERRUPTS(adapter);
	adapter->state = ADAPT_DOWN;
	adapter->linkstate = LINK_DOWN;

	spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
	sxg_deregister_interrupt(adapter);
	WRITE_REG(HwRegs->Reset, 0xDEAD, FLUSH);
	mdelay(5000);

	del_timer_sync(&adapter->watchdog_timer);
	netif_stop_queue(dev);
	netif_carrier_off(dev);

	napi_disable(&adapter->napi);

	WRITE_REG(adapter->UcodeRegs[0].RcvCmd, 0, true);
	adapter->devflags_prev = 0;
	DBG_ERROR("sxg: %s (%s) set adapter[%p] state to ADAPT_DOWN(%d)\n",
		  __func__, dev->name, adapter, adapter->state);

	spin_lock(&adapter->RcvQLock);
	/* Free all the blocks and the buffers, moved from remove() routine */
	if (!(IsListEmpty(&adapter->AllRcvBlocks))) {
		sxg_free_rcvblocks(adapter);
	}


	InitializeListHead(&adapter->FreeRcvBuffers);
	InitializeListHead(&adapter->FreeRcvBlocks);
	InitializeListHead(&adapter->AllRcvBlocks);
	InitializeListHead(&adapter->FreeSglBuffers);
	InitializeListHead(&adapter->AllSglBuffers);

	adapter->FreeRcvBufferCount = 0;
	adapter->FreeRcvBlockCount = 0;
	adapter->AllRcvBlockCount = 0;
	adapter->RcvBuffersOnCard = 0;
	adapter->PendingRcvCount = 0;

	memset(adapter->RcvRings, 0, sizeof(struct sxg_rcv_ring) * 1);
	memset(adapter->EventRings, 0, sizeof(struct sxg_event_ring) * RssIds);
	memset(adapter->Isr, 0, sizeof(u32) * IsrCount);
	for (i = 0; i < SXG_MAX_RING_SIZE; i++)
		adapter->RcvRingZeroInfo.Context[i] = NULL;
	SXG_INITIALIZE_RING(adapter->RcvRingZeroInfo, SXG_RCV_RING_SIZE);
	SXG_INITIALIZE_RING(adapter->XmtRingZeroInfo, SXG_XMT_RING_SIZE);

	spin_unlock(&adapter->RcvQLock);

	spin_lock_irqsave(&adapter->XmtZeroLock, flags);
	adapter->AllSglBufferCount = 0;
	adapter->FreeSglBufferCount = 0;
	adapter->PendingXmtCount = 0;
	memset(adapter->XmtRings, 0, sizeof(struct sxg_xmt_ring) * 1);
	memset(adapter->XmtRingZeroIndex, 0, sizeof(u32));
	spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);

	for (i = 0; i < SXG_MAX_RSS; i++) {
		adapter->NextEvent[i] = 0;
	}
	atomic_set(&adapter->pending_allocations, 0);
	adapter->intrregistered = 0;
	sxg_remove_isr(adapter);
	DBG_ERROR("sxg: %s (%s) EXIT\n", __FUNCTION__, dev->name);
	return (STATUS_SUCCESS);
}

static int sxg_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	ASSERT(rq);
/*      DBG_ERROR("sxg: %s cmd[%x] rq[%p] dev[%p]\n", __func__, cmd, rq, dev);*/
	switch (cmd) {
	case SIOCSLICSETINTAGG:
		{
			/* struct adapter_t *adapter = (struct adapter_t *)
			 * netdev_priv(dev);
			 */
			u32 data[7];
			u32 intagg;

			if (copy_from_user(data, rq->ifr_data, 28)) {
				DBG_ERROR("copy_from_user FAILED  getting \
					 initial params\n");
				return -EFAULT;
			}
			intagg = data[0];
			printk(KERN_EMERG
			       "%s: set interrupt aggregation to %d\n",
			       __func__, intagg);
			return 0;
		}

	default:
		/* DBG_ERROR("sxg: %s UNSUPPORTED[%x]\n", __func__, cmd); */
		return -EOPNOTSUPP;
	}
	return 0;
}

#define NORMAL_ETHFRAME     0

/*
 * sxg_send_packets - Send a skb packet
 *
 * Arguments:
 *			skb - The packet to send
 *			dev - Our linux net device that refs our adapter
 *
 * Return:
 *		0   regardless of outcome    XXXTODO refer to e1000 driver
 */
static int sxg_send_packets(struct sk_buff *skb, struct net_device *dev)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);
	u32 status = STATUS_SUCCESS;

	/*
	 * DBG_ERROR("sxg: %s ENTER sxg_send_packets skb[%p]\n", __FUNCTION__,
	 *	  skb);
	 */

	/* Check the adapter state */
	switch (adapter->State) {
	case SXG_STATE_INITIALIZING:
	case SXG_STATE_HALTED:
	case SXG_STATE_SHUTDOWN:
		ASSERT(0);	/* unexpected */
		/* fall through */
	case SXG_STATE_RESETTING:
	case SXG_STATE_SLEEP:
	case SXG_STATE_BOOTDIAG:
	case SXG_STATE_DIAG:
	case SXG_STATE_HALTING:
		status = STATUS_FAILURE;
		break;
	case SXG_STATE_RUNNING:
		if (adapter->LinkState != SXG_LINK_UP) {
			status = STATUS_FAILURE;
		}
		break;
	default:
		ASSERT(0);
		status = STATUS_FAILURE;
	}
	if (status != STATUS_SUCCESS) {
		goto xmit_fail;
	}
	/* send a packet */
	status = sxg_transmit_packet(adapter, skb);
	if (status == STATUS_SUCCESS) {
		goto xmit_done;
	}

      xmit_fail:
	/* reject & complete all the packets if they cant be sent */
	if (status != STATUS_SUCCESS) {
#if XXXTODO
	/* sxg_send_packets_fail(adapter, skb, status); */
#else
		SXG_DROP_DUMB_SEND(adapter, skb);
		adapter->stats.tx_dropped++;
		return NETDEV_TX_BUSY;
#endif
	}
	DBG_ERROR("sxg: %s EXIT sxg_send_packets status[%x]\n", __func__,
		  status);

      xmit_done:
	return NETDEV_TX_OK;
}

/*
 * sxg_transmit_packet
 *
 * This function transmits a single packet.
 *
 * Arguments -
 *		adapter			- Pointer to our adapter structure
 *      skb             - The packet to be sent
 *
 * Return - STATUS of send
 */
static int sxg_transmit_packet(struct adapter_t *adapter, struct sk_buff *skb)
{
	struct sxg_x64_sgl         *pSgl;
	struct sxg_scatter_gather  *SxgSgl;
	unsigned long sgl_flags;
	/* void *SglBuffer; */
	/* u32 SglBufferLength; */

	/*
	 * The vast majority of work is done in the shared
	 * sxg_dumb_sgl routine.
	 */
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DumbSend",
		  adapter, skb, 0, 0);

	/* Allocate a SGL buffer */
	SXG_GET_SGL_BUFFER(adapter, SxgSgl, 0);
	if (!SxgSgl) {
		adapter->Stats.NoSglBuf++;
		adapter->stats.tx_errors++;
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "SndPktF1",
			  adapter, skb, 0, 0);
		return (STATUS_RESOURCES);
	}
	ASSERT(SxgSgl->adapter == adapter);
	/*SglBuffer = SXG_SGL_BUFFER(SxgSgl);
	SglBufferLength = SXG_SGL_BUF_SIZE; */
	SxgSgl->VlanTag.VlanTci = 0;
	SxgSgl->VlanTag.VlanTpid = 0;
	SxgSgl->Type = SXG_SGL_DUMB;
	SxgSgl->DumbPacket = skb;
	pSgl = NULL;

	/* Call the common sxg_dumb_sgl routine to complete the send. */
	return (sxg_dumb_sgl(pSgl, SxgSgl));
}

/*
 * sxg_dumb_sgl
 *
 * Arguments:
 *		pSgl     -
 *		SxgSgl   - struct sxg_scatter_gather
 *
 * Return Value:
 * 	Status of send operation.
 */
static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl,
				struct sxg_scatter_gather *SxgSgl)
{
	struct adapter_t *adapter = SxgSgl->adapter;
	struct sk_buff *skb = SxgSgl->DumbPacket;
	/* For now, all dumb-nic sends go on RSS queue zero */
	struct sxg_xmt_ring *XmtRing = &adapter->XmtRings[0];
	struct sxg_ring_info *XmtRingInfo = &adapter->XmtRingZeroInfo;
	struct sxg_cmd *XmtCmd = NULL;
	/* u32 Index = 0; */
	u32 DataLength = skb->len;
	/* unsigned int BufLen; */
	/* u32 SglOffset; */
	u64 phys_addr;
	unsigned long flags;
	unsigned long queue_id=0;
	int offload_cksum = 0;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DumbSgl",
		  pSgl, SxgSgl, 0, 0);

	/* Set aside a pointer to the sgl */
	SxgSgl->pSgl = pSgl;

	/* Sanity check that our SGL format is as we expect. */
	ASSERT(sizeof(struct sxg_x64_sge) == sizeof(struct sxg_x64_sge));
	/* Shouldn't be a vlan tag on this frame */
	ASSERT(SxgSgl->VlanTag.VlanTci == 0);
	ASSERT(SxgSgl->VlanTag.VlanTpid == 0);

	/*
	 * From here below we work with the SGL placed in our
	 * buffer.
	 */

	SxgSgl->Sgl.NumberOfElements = 1;
	/*
	 * Set ucode Queue ID based on bottom bits of destination TCP port.
	 * This Queue ID splits slowpath/dumb-nic packet processing across
	 * multiple threads on the card to improve performance.  It is split
	 * using the TCP port to avoid out-of-order packets that can result
         * from multithreaded processing.  We use the destination port because
         * we expect to be run on a server, so in nearly all cases the local
         * port is likely to be constant (well-known server port) and the
         * remote port is likely to be random.  The exception to this is iSCSI,
         * in which case we use the sport instead.  Note
         * that original attempt at XOR'ing source and dest port resulted in
         * poor balance on NTTTCP/iometer applications since they tend to
         * line up (even-even, odd-odd..).
         */

	if (skb->protocol == htons(ETH_P_IP)) {
                struct iphdr *ip;

                ip = ip_hdr(skb);
		if (ip->protocol == IPPROTO_TCP)
			offload_cksum = 1;
		if (!offload_cksum || !tcp_hdr(skb))
			queue_id = 0;
		else if (offload_cksum && (DataLength >= sizeof(
							struct tcphdr))){
			queue_id = ((ntohs(tcp_hdr(skb)->dest) == ISCSI_PORT) ?
					(ntohs (tcp_hdr(skb)->source) &
						SXG_LARGE_SEND_QUEUE_MASK):
						(ntohs(tcp_hdr(skb)->dest) &
						SXG_LARGE_SEND_QUEUE_MASK));
		}
	} else if (skb->protocol == htons(ETH_P_IPV6)) {
		if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
			offload_cksum = 1;
		if (!offload_cksum || !tcp_hdr(skb))
			queue_id = 0;
		else if (offload_cksum && (DataLength>=sizeof(struct tcphdr))){
			queue_id = ((ntohs(tcp_hdr(skb)->dest) == ISCSI_PORT) ?
					(ntohs (tcp_hdr(skb)->source) &
					SXG_LARGE_SEND_QUEUE_MASK):
                                        (ntohs(tcp_hdr(skb)->dest) &
					SXG_LARGE_SEND_QUEUE_MASK));
		}
	}

	/* Grab the spinlock and acquire a command */
	spin_lock_irqsave(&adapter->XmtZeroLock, flags);
	SXG_GET_CMD(XmtRing, XmtRingInfo, XmtCmd, SxgSgl);
	if (XmtCmd == NULL) {
		/*
		 * Call sxg_complete_slow_send to see if we can
		 * free up any XmtRingZero entries and then try again
		 */

		spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);
		sxg_complete_slow_send(adapter);
		spin_lock_irqsave(&adapter->XmtZeroLock, flags);
		SXG_GET_CMD(XmtRing, XmtRingInfo, XmtCmd, SxgSgl);
		if (XmtCmd == NULL) {
			adapter->Stats.XmtZeroFull++;
			goto abortcmd;
		}
	}
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DumbCmd",
		  XmtCmd, XmtRingInfo->Head, XmtRingInfo->Tail, 0);
	memset(XmtCmd, '\0', sizeof(*XmtCmd));
	XmtCmd->SgEntries = 1;
	XmtCmd->Flags = 0;
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		/*
		 * We need to set the Checkum in IP  header to 0. This is
		 * required by hardware.
		 */
		if (offload_cksum) {
			ip_hdr(skb)->check = 0x0;
			XmtCmd->CsumFlags.Flags |= SXG_SLOWCMD_CSUM_IP;
			XmtCmd->CsumFlags.Flags |= SXG_SLOWCMD_CSUM_TCP;
			/*
			 * Dont know if length will require a change in
			 * case of VLAN
			 */
			XmtCmd->CsumFlags.MacLen = ETH_HLEN;
			XmtCmd->CsumFlags.IpHl = skb_network_header_len(skb) >>
							SXG_NW_HDR_LEN_SHIFT;
		} else {
			if (skb_checksum_help(skb)){
				printk(KERN_EMERG "Dropped UDP packet for"
					" incorrect checksum calculation\n");
				if (XmtCmd)
					SXG_ABORT_CMD(XmtRingInfo);
				spin_unlock_irqrestore(&adapter->XmtZeroLock,
							 flags);
				return STATUS_SUCCESS;
			}
		}
	}

	/*
	 * Fill in the command
	 * Copy out the first SGE to the command and adjust for offset
	 */
	phys_addr = pci_map_single(adapter->pcidev, skb->data, skb->len,
			   PCI_DMA_TODEVICE);

	/*
	 * SAHARA SGL WORKAROUND
	 * See if the SGL straddles a 64k boundary.  If so, skip to
	 * the start of the next 64k boundary and continue
 	 */

	if ((adapter->asictype == SAHARA_REV_A) &&
		(SXG_INVALID_SGL(phys_addr,skb->data_len)))
	{
		spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);
		if (XmtCmd)
			SXG_ABORT_CMD(XmtRingInfo);
		/* Silently drop this packet */
		printk(KERN_EMERG"Dropped a packet for 64k boundary problem\n");
		return STATUS_SUCCESS;
	}
	XmtCmd->Buffer.FirstSgeAddress = phys_addr;
	XmtCmd->Buffer.FirstSgeLength = DataLength;
	XmtCmd->Buffer.SgeOffset = 0;
	XmtCmd->Buffer.TotalLength = DataLength;

	/*
	 * Advance transmit cmd descripter by 1.
	 * NOTE - See comments in SxgTcpOutput where we write
	 * to the XmtCmd register regarding CPU ID values and/or
	 * multiple commands.
	 * Top 16 bits specify queue_id.  See comments about queue_id above
	 */
	/* Four queues at the moment */
	ASSERT((queue_id & ~SXG_LARGE_SEND_QUEUE_MASK) == 0);
	WRITE_REG(adapter->UcodeRegs[0].XmtCmd, ((queue_id << 16) | 1), TRUE);
	adapter->Stats.XmtQLen++;	/* Stats within lock */
	/* Update stats */
	adapter->stats.tx_packets++;
	adapter->stats.tx_bytes += DataLength;
#if XXXTODO			/* Stats stuff */
	if (SXG_MULTICAST_PACKET(EtherHdr)) {
		if (SXG_BROADCAST_PACKET(EtherHdr)) {
			adapter->Stats.DumbXmtBcastPkts++;
			adapter->Stats.DumbXmtBcastBytes += DataLength;
		} else {
			adapter->Stats.DumbXmtMcastPkts++;
			adapter->Stats.DumbXmtMcastBytes += DataLength;
		}
	} else {
		adapter->Stats.DumbXmtUcastPkts++;
		adapter->Stats.DumbXmtUcastBytes += DataLength;
	}
#endif

	spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XDumSgl2",
		  XmtCmd, pSgl, SxgSgl, 0);
	return  STATUS_SUCCESS;

      abortcmd:
	/*
	 * NOTE - Only jump to this label AFTER grabbing the
	 * XmtZeroLock, and DO NOT DROP IT between the
	 * command allocation and the following abort.
	 */
	if (XmtCmd) {
		SXG_ABORT_CMD(XmtRingInfo);
	}
	spin_unlock_irqrestore(&adapter->XmtZeroLock, flags);

/*
 * failsgl:
 * 	Jump to this label if failure occurs before the
 *	XmtZeroLock is grabbed
 */
	adapter->stats.tx_errors++;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "DumSGFal",
		  pSgl, SxgSgl, XmtRingInfo->Head, XmtRingInfo->Tail);
	/* SxgSgl->DumbPacket is the skb */
	// SXG_COMPLETE_DUMB_SEND(adapter, SxgSgl->DumbPacket);

 	return STATUS_FAILURE;
}

/*
 * Link management functions
 *
 * sxg_initialize_link - Initialize the link stuff
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	status
 */
static int sxg_initialize_link(struct adapter_t *adapter)
{
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	u32 Value;
	u32 ConfigData;
	u32 MaxFrame;
	u32 AxgMacReg1;
	int status;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "InitLink",
		  adapter, 0, 0, 0);

	/* Reset PHY and XGXS module */
	WRITE_REG(HwRegs->LinkStatus, LS_SERDES_POWER_DOWN, TRUE);

	/* Reset transmit configuration register */
	WRITE_REG(HwRegs->XmtConfig, XMT_CONFIG_RESET, TRUE);

	/* Reset receive configuration register */
	WRITE_REG(HwRegs->RcvConfig, RCV_CONFIG_RESET, TRUE);

	/* Reset all MAC modules */
	WRITE_REG(HwRegs->MacConfig0, AXGMAC_CFG0_SUB_RESET, TRUE);

	/*
	 * Link address 0
	 * XXXTODO - This assumes the MAC address (0a:0b:0c:0d:0e:0f)
	 * is stored with the first nibble (0a) in the byte 0
	 * of the Mac address.  Possibly reverse?
	 */
	Value = *(u32 *) adapter->macaddr;
	WRITE_REG(HwRegs->LinkAddress0Low, Value, TRUE);
	/* also write the MAC address to the MAC.  Endian is reversed. */
	WRITE_REG(HwRegs->MacAddressLow, ntohl(Value), TRUE);
	Value = (*(u16 *) & adapter->macaddr[4] & 0x0000FFFF);
	WRITE_REG(HwRegs->LinkAddress0High, Value | LINK_ADDRESS_ENABLE, TRUE);
	/* endian swap for the MAC (put high bytes in bits [31:16], swapped) */
	Value = ntohl(Value);
	WRITE_REG(HwRegs->MacAddressHigh, Value, TRUE);
	/* Link address 1 */
	WRITE_REG(HwRegs->LinkAddress1Low, 0, TRUE);
	WRITE_REG(HwRegs->LinkAddress1High, 0, TRUE);
	/* Link address 2 */
	WRITE_REG(HwRegs->LinkAddress2Low, 0, TRUE);
	WRITE_REG(HwRegs->LinkAddress2High, 0, TRUE);
	/* Link address 3 */
	WRITE_REG(HwRegs->LinkAddress3Low, 0, TRUE);
	WRITE_REG(HwRegs->LinkAddress3High, 0, TRUE);

	/* Enable MAC modules */
	WRITE_REG(HwRegs->MacConfig0, 0, TRUE);

	/* Configure MAC */
	AxgMacReg1 = (  /* Enable XMT */
			AXGMAC_CFG1_XMT_EN |
			/* Enable receive */
			AXGMAC_CFG1_RCV_EN |
			/* short frame detection */
			AXGMAC_CFG1_SHORT_ASSERT |
			/* Verify frame length */
			AXGMAC_CFG1_CHECK_LEN |
			/* Generate FCS */
			AXGMAC_CFG1_GEN_FCS |
			/* Pad frames to 64 bytes */
			AXGMAC_CFG1_PAD_64);

 	if (adapter->XmtFcEnabled) {
		AxgMacReg1 |=  AXGMAC_CFG1_XMT_PAUSE;  /* Allow sending of pause */
 	}
 	if (adapter->RcvFcEnabled) {
		AxgMacReg1 |=  AXGMAC_CFG1_RCV_PAUSE;  /* Enable detection of pause */
 	}

 	WRITE_REG(HwRegs->MacConfig1, AxgMacReg1, TRUE);

	/* Set AXGMAC max frame length if jumbo.  Not needed for standard MTU */
	if (adapter->JumboEnabled) {
		WRITE_REG(HwRegs->MacMaxFrameLen, AXGMAC_MAXFRAME_JUMBO, TRUE);
	}
	/*
	 * AMIIM Configuration Register -
	 * The value placed in the AXGMAC_AMIIM_CFG_HALF_CLOCK portion
	 * (bottom bits) of this register is used to determine the MDC frequency
	 * as specified in the A-XGMAC Design Document. This value must not be
	 * zero.  The following value (62 or 0x3E) is based on our MAC transmit
	 * clock frequency (MTCLK) of 312.5 MHz. Given a maximum MDIO clock
	 * frequency of 2.5 MHz (see the PHY spec), we get:
	 * 	312.5/(2*(X+1)) < 2.5  ==> X = 62.
	 * This value happens to be the default value for this register, so we
	 * really don't have to do this.
	 */
	if (adapter->asictype == SAHARA_REV_B) {
		WRITE_REG(HwRegs->MacAmiimConfig, 0x0000001F, TRUE);
	} else {
		WRITE_REG(HwRegs->MacAmiimConfig, 0x0000003E, TRUE);
	}

	/* Power up and enable PHY and XAUI/XGXS/Serdes logic */
	WRITE_REG(HwRegs->LinkStatus,
		   (LS_PHY_CLR_RESET |
		    LS_XGXS_ENABLE |
		    LS_XGXS_CTL |
		    LS_PHY_CLK_EN |
		    LS_ATTN_ALARM),
		    TRUE);
	DBG_ERROR("After Power Up and enable PHY in sxg_initialize_link\n");

	/*
	 * Per information given by Aeluros, wait 100 ms after removing reset.
	 * It's not enough to wait for the self-clearing reset bit in reg 0 to
	 * clear.
	 */
	mdelay(100);

	/* Verify the PHY has come up by checking that the Reset bit has
	 * cleared.
	 */
	status = sxg_read_mdio_reg(adapter,
				MIIM_DEV_PHY_PMA, /* PHY PMA/PMD module */
				PHY_PMA_CONTROL1, /* PMA/PMD control register */
				&Value);
	DBG_ERROR("After sxg_read_mdio_reg Value[%x] fail=%x\n", Value,
					 (Value & PMA_CONTROL1_RESET));
	if (status != STATUS_SUCCESS)
		return (STATUS_FAILURE);
	if (Value & PMA_CONTROL1_RESET)	/* reset complete if bit is 0 */
		return (STATUS_FAILURE);

	/* The SERDES should be initialized by now - confirm */
	READ_REG(HwRegs->LinkStatus, Value);
	if (Value & LS_SERDES_DOWN)	/* verify SERDES is initialized */
		return (STATUS_FAILURE);

	/* The XAUI link should also be up - confirm */
	if (!(Value & LS_XAUI_LINK_UP))	/* verify XAUI link is up */
		return (STATUS_FAILURE);

	/* Initialize the PHY */
	status = sxg_phy_init(adapter);
	if (status != STATUS_SUCCESS)
		return (STATUS_FAILURE);

	/* Enable the Link Alarm */

	/* MIIM_DEV_PHY_PMA		- PHY PMA/PMD module
	 * LASI_CONTROL			- LASI control register
	 * LASI_CTL_LS_ALARM_ENABLE	- enable link alarm bit
	 */
	status = sxg_write_mdio_reg(adapter, MIIM_DEV_PHY_PMA,
				    LASI_CONTROL,
				    LASI_CTL_LS_ALARM_ENABLE);
	if (status != STATUS_SUCCESS)
		return (STATUS_FAILURE);

	/* XXXTODO - temporary - verify bit is set */

	/* MIIM_DEV_PHY_PMA		- PHY PMA/PMD module
	 * LASI_CONTROL			- LASI control register
	 */
	status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_PMA,
				   LASI_CONTROL,
				   &Value);

	if (status != STATUS_SUCCESS)
		return (STATUS_FAILURE);
	if (!(Value & LASI_CTL_LS_ALARM_ENABLE)) {
		DBG_ERROR("Error!  LASI Control Alarm Enable bit not set!\n");
	}
	/* Enable receive */
	MaxFrame = adapter->JumboEnabled ? JUMBOMAXFRAME : ETHERMAXFRAME;
	ConfigData = (RCV_CONFIG_ENABLE |
		      RCV_CONFIG_ENPARSE |
		      RCV_CONFIG_RCVBAD |
		      RCV_CONFIG_RCVPAUSE |
		      RCV_CONFIG_TZIPV6 |
		      RCV_CONFIG_TZIPV4 |
		      RCV_CONFIG_HASH_16 |
		      RCV_CONFIG_SOCKET | RCV_CONFIG_BUFSIZE(MaxFrame));

	if (adapter->asictype == SAHARA_REV_B) {
		ConfigData |= (RCV_CONFIG_HIPRICTL  |
				RCV_CONFIG_NEWSTATUSFMT);
	}
	WRITE_REG(HwRegs->RcvConfig, ConfigData, TRUE);

	WRITE_REG(HwRegs->XmtConfig, XMT_CONFIG_ENABLE, TRUE);

	/* Mark the link as down.  We'll get a link event when it comes up. */
	sxg_link_state(adapter, SXG_LINK_DOWN);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XInitLnk",
		  adapter, 0, 0, 0);
	return (STATUS_SUCCESS);
}

/*
 * sxg_phy_init - Initialize the PHY
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	status
 */
static int sxg_phy_init(struct adapter_t *adapter)
{
	u32 Value;
	struct phy_ucode *p;
	int status;

	DBG_ERROR("ENTER %s\n", __func__);

	/* MIIM_DEV_PHY_PMA - PHY PMA/PMD module
	 * 0xC205 - PHY ID register (?)
	 * &Value - XXXTODO - add def
	 */
	status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_PMA,
				   0xC205,
				   &Value);
	if (status != STATUS_SUCCESS)
		return (STATUS_FAILURE);

	if (Value == 0x0012) {
		/* 0x0012 == AEL2005C PHY(?) - XXXTODO - add def */
		DBG_ERROR("AEL2005C PHY detected.  Downloading PHY \
				 microcode.\n");

		/* Initialize AEL2005C PHY and download PHY microcode */
		for (p = PhyUcode; p->Addr != 0xFFFF; p++) {
			if (p->Addr == 0) {
				/* if address == 0, data == sleep time in ms */
				mdelay(p->Data);
			} else {
			/* write the given data to the specified address */
				status = sxg_write_mdio_reg(adapter,
							MIIM_DEV_PHY_PMA,
							/* PHY address */
							    p->Addr,
							/* PHY data */
							    p->Data);
				if (status != STATUS_SUCCESS)
					return (STATUS_FAILURE);
			}
		}
	}
	DBG_ERROR("EXIT %s\n", __func__);

	return (STATUS_SUCCESS);
}

/*
 * sxg_link_event - Process a link event notification from the card
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	None
 */
static void sxg_link_event(struct adapter_t *adapter)
{
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	struct net_device *netdev = adapter->netdev;
	enum SXG_LINK_STATE LinkState;
	int status;
	u32 Value;

	if (adapter->state == ADAPT_DOWN)
		return;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "LinkEvnt",
		  adapter, 0, 0, 0);
	DBG_ERROR("ENTER %s\n", __func__);

	/* Check the Link Status register.  We should have a Link Alarm. */
	READ_REG(HwRegs->LinkStatus, Value);
	if (Value & LS_LINK_ALARM) {
		/*
		 * We got a Link Status alarm.  First, pause to let the
		 * link state settle (it can bounce a number of times)
		 */
		mdelay(10);

		/* Now clear the alarm by reading the LASI status register. */
		/* MIIM_DEV_PHY_PMA - PHY PMA/PMD module */
		status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_PMA,
					/* LASI status register */
					   LASI_STATUS,
					   &Value);
		if (status != STATUS_SUCCESS) {
			DBG_ERROR("Error reading LASI Status MDIO register!\n");
			sxg_link_state(adapter, SXG_LINK_DOWN);
		/* ASSERT(0); */
		}
		/*
		 * We used to assert that the LASI_LS_ALARM bit was set, as
		 * it should be.  But there appears to be cases during
		 * initialization (when the PHY is reset and re-initialized)
		 * when we get a link alarm, but the status bit is 0 when we
		 * read it.  Rather than trying to assure this never happens
		 * (and nver being certain), just ignore it.

		 * ASSERT(Value & LASI_STATUS_LS_ALARM);
		 */

		/* Now get and set the link state */
		LinkState = sxg_get_link_state(adapter);
		sxg_link_state(adapter, LinkState);
		DBG_ERROR("SXG: Link Alarm occurred.  Link is %s\n",
			  ((LinkState == SXG_LINK_UP) ? "UP" : "DOWN"));
		if (LinkState == SXG_LINK_UP) {
			netif_carrier_on(netdev);
			netif_tx_start_all_queues(netdev);
		} else {
			netif_tx_stop_all_queues(netdev);
			netif_carrier_off(netdev);
		}
	} else {
		/*
	 	 * XXXTODO - Assuming Link Attention is only being generated
	 	 * for the Link Alarm pin (and not for a XAUI Link Status change)
	 	 * , then it's impossible to get here.  Yet we've gotten here
	 	 * twice (under extreme conditions - bouncing the link up and
	 	 * down many times a second). Needs further investigation.
	 	 */
		DBG_ERROR("SXG: sxg_link_event: Can't get here!\n");
		DBG_ERROR("SXG: Link Status == 0x%08X.\n", Value);
		/* ASSERT(0); */
	}
	DBG_ERROR("EXIT %s\n", __func__);

}

/*
 * sxg_get_link_state - Determine if the link is up or down
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	Link State
 */
static enum SXG_LINK_STATE sxg_get_link_state(struct adapter_t *adapter)
{
	int status;
	u32 Value;

	DBG_ERROR("ENTER %s\n", __func__);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "GetLink",
		  adapter, 0, 0, 0);

	/*
	 * Per the Xenpak spec (and the IEEE 10Gb spec?), the link is up if
	 * the following 3 bits (from 3 different MDIO registers) are all true.
	 */

	/* MIIM_DEV_PHY_PMA -  PHY PMA/PMD module */
	status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_PMA,
				/* PMA/PMD Receive Signal Detect register */
				   PHY_PMA_RCV_DET,
				   &Value);
	if (status != STATUS_SUCCESS)
		goto bad;

	/* If PMA/PMD receive signal detect is 0, then the link is down */
	if (!(Value & PMA_RCV_DETECT))
		return (SXG_LINK_DOWN);

	/* MIIM_DEV_PHY_PCS - PHY PCS module */
	status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_PCS,
				/* PCS 10GBASE-R Status 1 register */
				   PHY_PCS_10G_STATUS1,
				   &Value);
	if (status != STATUS_SUCCESS)
		goto bad;

	/* If PCS is not locked to receive blocks, then the link is down */
	if (!(Value & PCS_10B_BLOCK_LOCK))
		return (SXG_LINK_DOWN);

	status = sxg_read_mdio_reg(adapter, MIIM_DEV_PHY_XS,/* PHY XS module */
				/* XS Lane Status register */
				   PHY_XS_LANE_STATUS,
				   &Value);
	if (status != STATUS_SUCCESS)
		goto bad;

	/* If XS transmit lanes are not aligned, then the link is down */
	if (!(Value & XS_LANE_ALIGN))
		return (SXG_LINK_DOWN);

	/* All 3 bits are true, so the link is up */
	DBG_ERROR("EXIT %s\n", __func__);

	return (SXG_LINK_UP);

      bad:
	/* An error occurred reading an MDIO register. This shouldn't happen. */
	DBG_ERROR("Error reading an MDIO register!\n");
	ASSERT(0);
	return (SXG_LINK_DOWN);
}

static void sxg_indicate_link_state(struct adapter_t *adapter,
				    enum SXG_LINK_STATE LinkState)
{
	if (adapter->LinkState == SXG_LINK_UP) {
		DBG_ERROR("%s: LINK now UP, call netif_start_queue\n",
			  __func__);
		netif_start_queue(adapter->netdev);
	} else {
		DBG_ERROR("%s: LINK now DOWN, call netif_stop_queue\n",
			  __func__);
		netif_stop_queue(adapter->netdev);
	}
}

/*
 * sxg_change_mtu - Change the Maximum Transfer Unit
 *  * @returns 0 on success, negative on failure
 */
int sxg_change_mtu (struct net_device *netdev, int new_mtu)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(netdev);

	if (!((new_mtu == SXG_DEFAULT_MTU) || (new_mtu == SXG_JUMBO_MTU)))
		return -EINVAL;

	if(new_mtu == netdev->mtu)
		return 0;

	netdev->mtu = new_mtu;

	if (new_mtu == SXG_JUMBO_MTU) {
		adapter->JumboEnabled = TRUE;
		adapter->FrameSize = JUMBOMAXFRAME;
		adapter->ReceiveBufferSize = SXG_RCV_JUMBO_BUFFER_SIZE;
	} else {
		adapter->JumboEnabled = FALSE;
		adapter->FrameSize = ETHERMAXFRAME;
		adapter->ReceiveBufferSize = SXG_RCV_DATA_BUFFER_SIZE;
	}

	sxg_entry_halt(netdev);
	sxg_entry_open(netdev);
	return 0;
}

/*
 * sxg_link_state - Set the link state and if necessary, indicate.
 *	This routine the central point of processing for all link state changes.
 *	Nothing else in the driver should alter the link state or perform
 *	link state indications
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *	LinkState 	- The link state
 *
 * Return
 *	None
 */
static void sxg_link_state(struct adapter_t *adapter,
				enum SXG_LINK_STATE LinkState)
{
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "LnkINDCT",
		  adapter, LinkState, adapter->LinkState, adapter->State);

	DBG_ERROR("ENTER %s\n", __func__);

	/*
	 * Hold the adapter lock during this routine.  Maybe move
	 * the lock to the caller.
	 */
	/* IMP TODO : Check if we can survive without taking this lock */
//	spin_lock(&adapter->AdapterLock);
	if (LinkState == adapter->LinkState) {
		/* Nothing changed.. */
//		spin_unlock(&adapter->AdapterLock);
		DBG_ERROR("EXIT #0 %s. Link status = %d\n",
					 __func__, LinkState);
		return;
	}
	/* Save the adapter state */
	adapter->LinkState = LinkState;

	/* Drop the lock and indicate link state */
//	spin_unlock(&adapter->AdapterLock);
	DBG_ERROR("EXIT #1 %s\n", __func__);

	sxg_indicate_link_state(adapter, LinkState);
}

/*
 * sxg_write_mdio_reg - Write to a register on the MDIO bus
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *  DevAddr     - MDIO device number being addressed
 *  RegAddr     - register address for the specified MDIO device
 *  Value		- value to write to the MDIO register
 *
 * Return
 *	status
 */
static int sxg_write_mdio_reg(struct adapter_t *adapter,
			      u32 DevAddr, u32 RegAddr, u32 Value)
{
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	/* Address operation (written to MIIM field reg) */
	u32 AddrOp;
	/* Write operation (written to MIIM field reg) */
	u32 WriteOp;
	u32 Cmd;/* Command (written to MIIM command reg) */
	u32 ValueRead;
	u32 Timeout;

	/* DBG_ERROR("ENTER %s\n", __func__); */

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "WrtMDIO",
		  adapter, 0, 0, 0);

	/* Ensure values don't exceed field width */
	DevAddr &= 0x001F;	/* 5-bit field */
	RegAddr &= 0xFFFF;	/* 16-bit field */
	Value &= 0xFFFF;	/* 16-bit field */

	/* Set MIIM field register bits for an MIIM address operation */
	AddrOp = (MIIM_PORT_NUM << AXGMAC_AMIIM_FIELD_PORT_SHIFT) |
	    (DevAddr << AXGMAC_AMIIM_FIELD_DEV_SHIFT) |
	    (MIIM_TA_10GB << AXGMAC_AMIIM_FIELD_TA_SHIFT) |
	    (MIIM_OP_ADDR << AXGMAC_AMIIM_FIELD_OP_SHIFT) | RegAddr;

	/* Set MIIM field register bits for an MIIM write operation */
	WriteOp = (MIIM_PORT_NUM << AXGMAC_AMIIM_FIELD_PORT_SHIFT) |
	    (DevAddr << AXGMAC_AMIIM_FIELD_DEV_SHIFT) |
	    (MIIM_TA_10GB << AXGMAC_AMIIM_FIELD_TA_SHIFT) |
	    (MIIM_OP_WRITE << AXGMAC_AMIIM_FIELD_OP_SHIFT) | Value;

	/* Set MIIM command register bits to execute an MIIM command */
	Cmd = AXGMAC_AMIIM_CMD_START | AXGMAC_AMIIM_CMD_10G_OPERATION;

	/* Reset the command register command bit (in case it's not 0) */
	WRITE_REG(HwRegs->MacAmiimCmd, 0, TRUE);

	/* MIIM write to set the address of the specified MDIO register */
	WRITE_REG(HwRegs->MacAmiimField, AddrOp, TRUE);

	/* Write to MIIM Command Register to execute to address operation */
	WRITE_REG(HwRegs->MacAmiimCmd, Cmd, TRUE);

	/* Poll AMIIM Indicator register to wait for completion */
	Timeout = SXG_LINK_TIMEOUT;
	do {
		udelay(100);	/* Timeout in 100us units */
		READ_REG(HwRegs->MacAmiimIndicator, ValueRead);
		if (--Timeout == 0) {
			return (STATUS_FAILURE);
		}
	} while (ValueRead & AXGMAC_AMIIM_INDC_BUSY);

	/* Reset the command register command bit */
	WRITE_REG(HwRegs->MacAmiimCmd, 0, TRUE);

	/* MIIM write to set up an MDIO write operation */
	WRITE_REG(HwRegs->MacAmiimField, WriteOp, TRUE);

	/* Write to MIIM Command Register to execute the write operation */
	WRITE_REG(HwRegs->MacAmiimCmd, Cmd, TRUE);

	/* Poll AMIIM Indicator register to wait for completion */
	Timeout = SXG_LINK_TIMEOUT;
	do {
		udelay(100);	/* Timeout in 100us units */
		READ_REG(HwRegs->MacAmiimIndicator, ValueRead);
		if (--Timeout == 0) {
			return (STATUS_FAILURE);
		}
	} while (ValueRead & AXGMAC_AMIIM_INDC_BUSY);

	/* DBG_ERROR("EXIT %s\n", __func__); */

	return (STATUS_SUCCESS);
}

/*
 * sxg_read_mdio_reg - Read a register on the MDIO bus
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *  DevAddr     - MDIO device number being addressed
 *  RegAddr     - register address for the specified MDIO device
 *  pValue	- pointer to where to put data read from the MDIO register
 *
 * Return
 *	status
 */
static int sxg_read_mdio_reg(struct adapter_t *adapter,
			     u32 DevAddr, u32 RegAddr, u32 *pValue)
{
	struct sxg_hw_regs *HwRegs = adapter->HwRegs;
	u32 AddrOp;	/* Address operation (written to MIIM field reg) */
	u32 ReadOp;	/* Read operation (written to MIIM field reg) */
	u32 Cmd;	/* Command (written to MIIM command reg) */
	u32 ValueRead;
	u32 Timeout;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "WrtMDIO",
		  adapter, 0, 0, 0);
	DBG_ERROR("ENTER %s\n", __FUNCTION__);

	/* Ensure values don't exceed field width */
	DevAddr &= 0x001F;	/* 5-bit field */
	RegAddr &= 0xFFFF;	/* 16-bit field */

	/* Set MIIM field register bits for an MIIM address operation */
	AddrOp = (MIIM_PORT_NUM << AXGMAC_AMIIM_FIELD_PORT_SHIFT) |
	    (DevAddr << AXGMAC_AMIIM_FIELD_DEV_SHIFT) |
	    (MIIM_TA_10GB << AXGMAC_AMIIM_FIELD_TA_SHIFT) |
	    (MIIM_OP_ADDR << AXGMAC_AMIIM_FIELD_OP_SHIFT) | RegAddr;

	/* Set MIIM field register bits for an MIIM read operation */
	ReadOp = (MIIM_PORT_NUM << AXGMAC_AMIIM_FIELD_PORT_SHIFT) |
	    (DevAddr << AXGMAC_AMIIM_FIELD_DEV_SHIFT) |
	    (MIIM_TA_10GB << AXGMAC_AMIIM_FIELD_TA_SHIFT) |
	    (MIIM_OP_READ << AXGMAC_AMIIM_FIELD_OP_SHIFT);

	/* Set MIIM command register bits to execute an MIIM command */
	Cmd = AXGMAC_AMIIM_CMD_START | AXGMAC_AMIIM_CMD_10G_OPERATION;

	/* Reset the command register command bit (in case it's not 0) */
	WRITE_REG(HwRegs->MacAmiimCmd, 0, TRUE);

	/* MIIM write to set the address of the specified MDIO register */
	WRITE_REG(HwRegs->MacAmiimField, AddrOp, TRUE);

	/* Write to MIIM Command Register to execute to address operation */
	WRITE_REG(HwRegs->MacAmiimCmd, Cmd, TRUE);

	/* Poll AMIIM Indicator register to wait for completion */
	Timeout = SXG_LINK_TIMEOUT;
	do {
		udelay(100);	/* Timeout in 100us units */
		READ_REG(HwRegs->MacAmiimIndicator, ValueRead);
		if (--Timeout == 0) {
            DBG_ERROR("EXIT %s with STATUS_FAILURE 1\n", __FUNCTION__);

			return (STATUS_FAILURE);
		}
	} while (ValueRead & AXGMAC_AMIIM_INDC_BUSY);

	/* Reset the command register command bit */
	WRITE_REG(HwRegs->MacAmiimCmd, 0, TRUE);

	/* MIIM write to set up an MDIO register read operation */
	WRITE_REG(HwRegs->MacAmiimField, ReadOp, TRUE);

	/* Write to MIIM Command Register to execute the read operation */
	WRITE_REG(HwRegs->MacAmiimCmd, Cmd, TRUE);

	/* Poll AMIIM Indicator register to wait for completion */
	Timeout = SXG_LINK_TIMEOUT;
	do {
		udelay(100);	/* Timeout in 100us units */
		READ_REG(HwRegs->MacAmiimIndicator, ValueRead);
		if (--Timeout == 0) {
            DBG_ERROR("EXIT %s with STATUS_FAILURE 2\n", __FUNCTION__);

			return (STATUS_FAILURE);
		}
	} while (ValueRead & AXGMAC_AMIIM_INDC_BUSY);

	/* Read the MDIO register data back from the field register */
	READ_REG(HwRegs->MacAmiimField, *pValue);
	*pValue &= 0xFFFF;	/* data is in the lower 16 bits */

	DBG_ERROR("EXIT %s\n", __FUNCTION__);

	return (STATUS_SUCCESS);
}

/*
 * Functions to obtain the CRC corresponding to the destination mac address.
 * This is a standard ethernet CRC in that it is a 32-bit, reflected CRC using
 * the polynomial:
 *   x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5
 *    + x^4 + x^2 + x^1.
 *
 * After the CRC for the 6 bytes is generated (but before the value is
 * complemented), we must then transpose the value and return bits 30-23.
 */
static u32 sxg_crc_table[256];/* Table of CRC's for all possible byte values */
static u32 sxg_crc_init;	/* Is table initialized */

/* Contruct the CRC32 table */
static void sxg_mcast_init_crc32(void)
{
	u32 c;			/*  CRC shit reg */
	u32 e = 0;		/*  Poly X-or pattern */
	int i;			/*  counter */
	int k;			/*  byte being shifted into crc  */

	static int p[] = { 0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26 };

	for (i = 0; i < sizeof(p) / sizeof(int); i++) {
		e |= 1L << (31 - p[i]);
	}

	for (i = 1; i < 256; i++) {
		c = i;
		for (k = 8; k; k--) {
			c = c & 1 ? (c >> 1) ^ e : c >> 1;
		}
		sxg_crc_table[i] = c;
	}
}

/*
 *  Return the MAC hast as described above.
 */
static unsigned char sxg_mcast_get_mac_hash(char *macaddr)
{
	u32 crc;
	char *p;
	int i;
	unsigned char machash = 0;

	if (!sxg_crc_init) {
		sxg_mcast_init_crc32();
		sxg_crc_init = 1;
	}

	crc = 0xFFFFFFFF;	/* Preload shift register, per crc-32 spec */
	for (i = 0, p = macaddr; i < 6; ++p, ++i) {
		crc = (crc >> 8) ^ sxg_crc_table[(crc ^ *p) & 0xFF];
	}

	/* Return bits 1-8, transposed */
	for (i = 1; i < 9; i++) {
		machash |= (((crc >> i) & 1) << (8 - i));
	}

	return (machash);
}

static void sxg_mcast_set_mask(struct adapter_t *adapter)
{
	struct sxg_ucode_regs *sxg_regs = adapter->UcodeRegs;

	DBG_ERROR("%s ENTER (%s) MacFilter[%x] mask[%llx]\n", __FUNCTION__,
		  adapter->netdev->name, (unsigned int)adapter->MacFilter,
		  adapter->MulticastMask);

	if (adapter->MacFilter & (MAC_ALLMCAST | MAC_PROMISC)) {
		/*
		 * Turn on all multicast addresses. We have to do this for
		 * promiscuous mode as well as ALLMCAST mode.  It saves the
		 * Microcode from having keep state about the MAC configuration
		 */
		/* DBG_ERROR("sxg: %s MacFilter = MAC_ALLMCAST | MAC_PROMISC\n \
		 * 				SLUT MODE!!!\n",__func__);
		 */
		WRITE_REG(sxg_regs->McastLow, 0xFFFFFFFF, FLUSH);
		WRITE_REG(sxg_regs->McastHigh, 0xFFFFFFFF, FLUSH);
		/* DBG_ERROR("%s (%s) WRITE to slic_regs slic_mcastlow&high \
		 * 0xFFFFFFFF\n",__func__, adapter->netdev->name);
		 */

	} else {
		/*
		 * Commit our multicast mast to the SLIC by writing to the
		 * multicast address mask registers
		 */
		DBG_ERROR("%s (%s) WRITE mcastlow[%lx] mcasthigh[%lx]\n",
			  __func__, adapter->netdev->name,
			  ((ulong) (adapter->MulticastMask & 0xFFFFFFFF)),
			  ((ulong)
			   ((adapter->MulticastMask >> 32) & 0xFFFFFFFF)));

		WRITE_REG(sxg_regs->McastLow,
			  (u32) (adapter->MulticastMask & 0xFFFFFFFF), FLUSH);
		WRITE_REG(sxg_regs->McastHigh,
			  (u32) ((adapter->
				  MulticastMask >> 32) & 0xFFFFFFFF), FLUSH);
	}
}

static void sxg_mcast_set_bit(struct adapter_t *adapter, char *address)
{
	unsigned char crcpoly;

	/* Get the CRC polynomial for the mac address */
	crcpoly = sxg_mcast_get_mac_hash(address);

	/*
	 * We only have space on the SLIC for 64 entries.  Lop
	 * off the top two bits. (2^6 = 64)
	 */
	crcpoly &= 0x3F;

	/* OR in the new bit into our 64 bit mask. */
	adapter->MulticastMask |= (u64) 1 << crcpoly;
}

/*
 *   Function takes MAC addresses from dev_mc_list and generates the Mask
 */

static void sxg_set_mcast_addr(struct adapter_t *adapter)
{
        struct dev_mc_list *mclist;
        struct net_device *dev = adapter->netdev;
        int i;

        if (adapter->MacFilter & (MAC_ALLMCAST | MAC_MCAST)) {
               for (i = 0, mclist = dev->mc_list; i < dev->mc_count;
                             i++, mclist = mclist->next) {
                        sxg_mcast_set_bit(adapter,mclist->da_addr);
                }
        }
        sxg_mcast_set_mask(adapter);
}

static void sxg_mcast_set_list(struct net_device *dev)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);

	ASSERT(adapter);
	if (dev->flags & IFF_PROMISC)
		adapter->MacFilter |= MAC_PROMISC;
        if (dev->flags & IFF_MULTICAST)
                adapter->MacFilter |= MAC_MCAST;
        if (dev->flags & IFF_ALLMULTI)
                adapter->MacFilter |= MAC_ALLMCAST;

	//XXX handle other flags as well
	sxg_set_mcast_addr(adapter);
}

void sxg_free_sgl_buffers(struct adapter_t *adapter)
{
        struct list_entry               *ple;
        struct sxg_scatter_gather       *Sgl;

        while(!(IsListEmpty(&adapter->AllSglBuffers))) {
 		ple = RemoveHeadList(&adapter->AllSglBuffers);
 		Sgl = container_of(ple, struct sxg_scatter_gather, AllList);
 		kfree(Sgl);
                adapter->AllSglBufferCount--;
        }
}

void sxg_free_rcvblocks(struct adapter_t *adapter)
{
	u32				i;
       	void                            *temp_RcvBlock;
       	struct list_entry               *ple;
       	struct sxg_rcv_block_hdr        *RcvBlockHdr;
	struct sxg_rcv_data_buffer_hdr	*RcvDataBufferHdr;
        ASSERT((adapter->state == SXG_STATE_INITIALIZING) ||
                    (adapter->state == SXG_STATE_HALTING));
        while(!(IsListEmpty(&adapter->AllRcvBlocks))) {

                 ple = RemoveHeadList(&adapter->AllRcvBlocks);
                 RcvBlockHdr = container_of(ple, struct sxg_rcv_block_hdr, AllList);

                if(RcvBlockHdr->VirtualAddress) {
                        temp_RcvBlock = RcvBlockHdr->VirtualAddress;

                        for(i=0; i< SXG_RCV_DESCRIPTORS_PER_BLOCK;
                             i++, temp_RcvBlock += SXG_RCV_DATA_HDR_SIZE) {
                                RcvDataBufferHdr =
                                        (struct sxg_rcv_data_buffer_hdr *)temp_RcvBlock;
                                SXG_FREE_RCV_PACKET(RcvDataBufferHdr);
                        }
                }

                pci_free_consistent(adapter->pcidev,
                                         SXG_RCV_BLOCK_SIZE(SXG_RCV_DATA_HDR_SIZE),
                                         RcvBlockHdr->VirtualAddress,
                                         RcvBlockHdr->PhysicalAddress);
                adapter->AllRcvBlockCount--;
	}
	ASSERT(adapter->AllRcvBlockCount == 0);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XFrRBlk",
			adapter, 0, 0, 0);
}
void sxg_free_mcast_addrs(struct adapter_t *adapter)
{
	struct sxg_multicast_address    *address;
        while(adapter->MulticastAddrs) {
                address = adapter->MulticastAddrs;
                adapter->MulticastAddrs = address->Next;
		kfree(address);
         }

        adapter->MulticastMask= 0;
}

void sxg_unmap_resources(struct adapter_t *adapter)
{
	if(adapter->HwRegs) {
        	iounmap((void *)adapter->HwRegs);
         }
        if(adapter->UcodeRegs) {
		iounmap((void *)adapter->UcodeRegs);
        }

        ASSERT(adapter->AllRcvBlockCount == 0);
        SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XFrRBlk",
                           adapter, 0, 0, 0);
}



/*
 * sxg_free_resources - Free everything allocated in SxgAllocateResources
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	none
 */
void sxg_free_resources(struct adapter_t *adapter)
{
	u32 RssIds, IsrCount;
	RssIds = SXG_RSS_CPU_COUNT(adapter);
	IsrCount = adapter->msi_enabled ? RssIds : 1;

	if (adapter->BasicAllocations == FALSE) {
		/*
		 * No allocations have been made, including spinlocks,
		 * or listhead initializations.  Return.
		 */
		return;
	}

	if (!(IsListEmpty(&adapter->AllRcvBlocks))) {
		sxg_free_rcvblocks(adapter);
	}
	if (!(IsListEmpty(&adapter->AllSglBuffers))) {
		sxg_free_sgl_buffers(adapter);
	}

	if (adapter->XmtRingZeroIndex) {
		pci_free_consistent(adapter->pcidev,
				    sizeof(u32),
				    adapter->XmtRingZeroIndex,
				    adapter->PXmtRingZeroIndex);
	}
        if (adapter->Isr) {
                pci_free_consistent(adapter->pcidev,
                                    sizeof(u32) * IsrCount,
                                    adapter->Isr, adapter->PIsr);
        }

        if (adapter->EventRings) {
                pci_free_consistent(adapter->pcidev,
                                    sizeof(struct sxg_event_ring) * RssIds,
                                    adapter->EventRings, adapter->PEventRings);
        }
        if (adapter->RcvRings) {
                pci_free_consistent(adapter->pcidev,
                                   sizeof(struct sxg_rcv_ring) * 1,
                                   adapter->RcvRings,
                                   adapter->PRcvRings);
                adapter->RcvRings = NULL;
        }

        if(adapter->XmtRings) {
                pci_free_consistent(adapter->pcidev,
                                            sizeof(struct sxg_xmt_ring) * 1,
                                            adapter->XmtRings,
                                            adapter->PXmtRings);
                        adapter->XmtRings = NULL;
        }

	if (adapter->ucode_stats) {
		pci_unmap_single(adapter->pcidev,
				sizeof(struct sxg_ucode_stats),
				 adapter->pucode_stats, PCI_DMA_FROMDEVICE);
		adapter->ucode_stats = NULL;
	}


	/* Unmap register spaces */
	sxg_unmap_resources(adapter);

	sxg_free_mcast_addrs(adapter);

	adapter->BasicAllocations = FALSE;

}

/*
 * sxg_allocate_complete -
 *
 * This routine is called when a memory allocation has completed.
 *
 * Arguments -
 *	struct adapter_t *   	- Our adapter structure
 *	VirtualAddress	- Memory virtual address
 *	PhysicalAddress	- Memory physical address
 *	Length		- Length of memory allocated (or 0)
 *	Context		- The type of buffer allocated
 *
 * Return
 *	None.
 */
static int sxg_allocate_complete(struct adapter_t *adapter,
				  void *VirtualAddress,
				  dma_addr_t PhysicalAddress,
				  u32 Length, enum sxg_buffer_type Context)
{
	int status = 0;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AllocCmp",
		  adapter, VirtualAddress, Length, Context);
	ASSERT(atomic_read(&adapter->pending_allocations));
	atomic_dec(&adapter->pending_allocations);

	switch (Context) {

	case SXG_BUFFER_TYPE_RCV:
		status = sxg_allocate_rcvblock_complete(adapter,
					       VirtualAddress,
					       PhysicalAddress, Length);
		break;
	case SXG_BUFFER_TYPE_SGL:
		sxg_allocate_sgl_buffer_complete(adapter, (struct sxg_scatter_gather *)
						 VirtualAddress,
						 PhysicalAddress, Length);
		break;
	}
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAlocCmp",
		  adapter, VirtualAddress, Length, Context);

	return status;
}

/*
 * sxg_allocate_buffer_memory - Shared memory allocation routine used for
 *		synchronous and asynchronous buffer allocations
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *	Size		- block size to allocate
 *	BufferType	- Type of buffer to allocate
 *
 * Return
 *	int
 */
static int sxg_allocate_buffer_memory(struct adapter_t *adapter,
				      u32 Size, enum sxg_buffer_type BufferType)
{
	int status;
	void *Buffer;
	dma_addr_t pBuffer;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AllocMem",
		  adapter, Size, BufferType, 0);
	/*
	 * Grab the adapter lock and check the state. If we're in anything other
	 * than INITIALIZING or RUNNING state, fail.  This is to prevent
	 * allocations in an improper driver state
	 */

 	atomic_inc(&adapter->pending_allocations);

	if(BufferType != SXG_BUFFER_TYPE_SGL)
		Buffer = pci_alloc_consistent(adapter->pcidev, Size, &pBuffer);
	else {
		Buffer = kzalloc(Size, GFP_ATOMIC);
		pBuffer = (dma_addr_t)NULL;
	}
	if (Buffer == NULL) {
		/*
		 * Decrement the AllocationsPending count while holding
		 * the lock.  Pause processing relies on this
		 */
 		atomic_dec(&adapter->pending_allocations);
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AlcMemF1",
			  adapter, Size, BufferType, 0);
		return (STATUS_RESOURCES);
	}
	status = sxg_allocate_complete(adapter, Buffer, pBuffer, Size, BufferType);

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAlocMem",
		  adapter, Size, BufferType, status);
	return status;
}

/*
 * sxg_allocate_rcvblock_complete - Complete a receive descriptor
 * 					block allocation
 *
 * Arguments -
 *	adapter				- A pointer to our adapter structure
 *	RcvBlock			- receive block virtual address
 *	PhysicalAddress		- Physical address
 *	Length				- Memory length
 *
 * Return
 */
static int sxg_allocate_rcvblock_complete(struct adapter_t *adapter,
					   void *RcvBlock,
					   dma_addr_t PhysicalAddress,
					   u32 Length)
{
	u32 i;
	u32 BufferSize = adapter->ReceiveBufferSize;
	u64 Paddr;
	void *temp_RcvBlock;
	struct sxg_rcv_block_hdr *RcvBlockHdr;
	struct sxg_rcv_data_buffer_hdr *RcvDataBufferHdr;
	struct sxg_rcv_descriptor_block *RcvDescriptorBlock;
	struct sxg_rcv_descriptor_block_hdr *RcvDescriptorBlockHdr;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AlRcvBlk",
		  adapter, RcvBlock, Length, 0);
	if (RcvBlock == NULL) {
		goto fail;
	}
	memset(RcvBlock, 0, Length);
	ASSERT((BufferSize == SXG_RCV_DATA_BUFFER_SIZE) ||
	       (BufferSize == SXG_RCV_JUMBO_BUFFER_SIZE));
	ASSERT(Length == SXG_RCV_BLOCK_SIZE(SXG_RCV_DATA_HDR_SIZE));
	/*
	 * First, initialize the contained pool of receive data buffers.
	 * This initialization requires NBL/NB/MDL allocations, if any of them
	 * fail, free the block and return without queueing the shared memory
	 */
	//RcvDataBuffer = RcvBlock;
	temp_RcvBlock = RcvBlock;
	for (i = 0; i < SXG_RCV_DESCRIPTORS_PER_BLOCK;
		 i++, temp_RcvBlock += SXG_RCV_DATA_HDR_SIZE) {
		RcvDataBufferHdr = (struct sxg_rcv_data_buffer_hdr *)
					temp_RcvBlock;
		/* For FREE macro assertion */
		RcvDataBufferHdr->State = SXG_BUFFER_UPSTREAM;
		SXG_ALLOCATE_RCV_PACKET(adapter, RcvDataBufferHdr, BufferSize);
		if (RcvDataBufferHdr->SxgDumbRcvPacket == NULL)
			goto fail;

	}

	/*
	 * Place this entire block of memory on the AllRcvBlocks queue so it
	 * can be free later
	 */

	RcvBlockHdr = (struct sxg_rcv_block_hdr *) ((unsigned char *)RcvBlock +
			SXG_RCV_BLOCK_HDR_OFFSET(SXG_RCV_DATA_HDR_SIZE));
	RcvBlockHdr->VirtualAddress = RcvBlock;
	RcvBlockHdr->PhysicalAddress = PhysicalAddress;
	spin_lock(&adapter->RcvQLock);
	adapter->AllRcvBlockCount++;
	InsertTailList(&adapter->AllRcvBlocks, &RcvBlockHdr->AllList);
	spin_unlock(&adapter->RcvQLock);

	/* Now free the contained receive data buffers that we
	 * initialized above */
	temp_RcvBlock = RcvBlock;
	for (i = 0, Paddr = PhysicalAddress;
	     i < SXG_RCV_DESCRIPTORS_PER_BLOCK;
	     i++, Paddr += SXG_RCV_DATA_HDR_SIZE,
	     temp_RcvBlock += SXG_RCV_DATA_HDR_SIZE) {
		RcvDataBufferHdr =
			(struct sxg_rcv_data_buffer_hdr *)temp_RcvBlock;
		spin_lock(&adapter->RcvQLock);
		SXG_FREE_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr);
		spin_unlock(&adapter->RcvQLock);
	}

	/* Locate the descriptor block and put it on a separate free queue */
	RcvDescriptorBlock =
	    (struct sxg_rcv_descriptor_block *) ((unsigned char *)RcvBlock +
					 SXG_RCV_DESCRIPTOR_BLOCK_OFFSET
					 (SXG_RCV_DATA_HDR_SIZE));
	RcvDescriptorBlockHdr =
	    (struct sxg_rcv_descriptor_block_hdr *) ((unsigned char *)RcvBlock +
					     SXG_RCV_DESCRIPTOR_BLOCK_HDR_OFFSET
					     (SXG_RCV_DATA_HDR_SIZE));
	RcvDescriptorBlockHdr->VirtualAddress = RcvDescriptorBlock;
	RcvDescriptorBlockHdr->PhysicalAddress = Paddr;
	spin_lock(&adapter->RcvQLock);
	SXG_FREE_RCV_DESCRIPTOR_BLOCK(adapter, RcvDescriptorBlockHdr);
	spin_unlock(&adapter->RcvQLock);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAlRBlk",
		  adapter, RcvBlock, Length, 0);
	return STATUS_SUCCESS;
fail:
	/* Free any allocated resources */
	if (RcvBlock) {
		temp_RcvBlock = RcvBlock;
		for (i = 0; i < SXG_RCV_DESCRIPTORS_PER_BLOCK;
		     i++, temp_RcvBlock += SXG_RCV_DATA_HDR_SIZE) {
			RcvDataBufferHdr =
			    (struct sxg_rcv_data_buffer_hdr *)temp_RcvBlock;
			SXG_FREE_RCV_PACKET(RcvDataBufferHdr);
		}
		pci_free_consistent(adapter->pcidev,
				    Length, RcvBlock, PhysicalAddress);
	}
	DBG_ERROR("%s: OUT OF RESOURCES\n", __func__);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_IMPORTANT, "RcvAFail",
		  adapter, adapter->FreeRcvBufferCount,
		  adapter->FreeRcvBlockCount, adapter->AllRcvBlockCount);
	adapter->Stats.NoMem++;
	/* As allocation failed, free all previously allocated blocks..*/
	//sxg_free_rcvblocks(adapter);

	return STATUS_RESOURCES;
}

/*
 * sxg_allocate_sgl_buffer_complete - Complete a SGL buffer allocation
 *
 * Arguments -
 *	adapter				- A pointer to our adapter structure
 *	SxgSgl				- struct sxg_scatter_gather buffer
 *	PhysicalAddress		- Physical address
 *	Length				- Memory length
 *
 * Return
 */
static void sxg_allocate_sgl_buffer_complete(struct adapter_t *adapter,
					     struct sxg_scatter_gather *SxgSgl,
					     dma_addr_t PhysicalAddress,
					     u32 Length)
{
	unsigned long sgl_flags;
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "AlSglCmp",
		  adapter, SxgSgl, Length, 0);
	spin_lock_irqsave(&adapter->SglQLock, sgl_flags);
	adapter->AllSglBufferCount++;
	/* PhysicalAddress; */
	SxgSgl->PhysicalAddress = PhysicalAddress;
	/* Initialize backpointer once */
	SxgSgl->adapter = adapter;
	InsertTailList(&adapter->AllSglBuffers, &SxgSgl->AllList);
	spin_unlock_irqrestore(&adapter->SglQLock, sgl_flags);
	SxgSgl->State = SXG_BUFFER_BUSY;
	SXG_FREE_SGL_BUFFER(adapter, SxgSgl, NULL);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XAlSgl",
		  adapter, SxgSgl, Length, 0);
}


static int sxg_adapter_set_hwaddr(struct adapter_t *adapter)
{
	/*
	 *  DBG_ERROR ("%s ENTER card->config_set[%x] port[%d] physport[%d] \
	 *  funct#[%d]\n", __func__, card->config_set,
	 *  adapter->port, adapter->physport, adapter->functionnumber);
	 *
	 *  sxg_dbg_macaddrs(adapter);
	 */
	/* DBG_ERROR ("%s AFTER copying from config.macinfo into currmacaddr\n",
	 *	   		__FUNCTION__);
	 */

	/* sxg_dbg_macaddrs(adapter); */

	struct net_device * dev = adapter->netdev;
	if(!dev)
	{
		printk("sxg: Dev is Null\n");
	}

        DBG_ERROR("%s ENTER (%s)\n", __FUNCTION__, adapter->netdev->name);

        if (netif_running(dev)) {
                return -EBUSY;
        }
        if (!adapter) {
                return -EBUSY;
        }

	if (!(adapter->currmacaddr[0] ||
	      adapter->currmacaddr[1] ||
	      adapter->currmacaddr[2] ||
	      adapter->currmacaddr[3] ||
	      adapter->currmacaddr[4] || adapter->currmacaddr[5])) {
		memcpy(adapter->currmacaddr, adapter->macaddr, 6);
	}
	if (adapter->netdev) {
		memcpy(adapter->netdev->dev_addr, adapter->currmacaddr, 6);
		memcpy(adapter->netdev->perm_addr, adapter->currmacaddr, 6);
	}
	/* DBG_ERROR ("%s EXIT port %d\n", __func__, adapter->port); */
	sxg_dbg_macaddrs(adapter);

	return 0;
}

#if XXXTODO
static int sxg_mac_set_address(struct net_device *dev, void *ptr)
{
	struct adapter_t *adapter = (struct adapter_t *) netdev_priv(dev);
	struct sockaddr *addr = ptr;

	DBG_ERROR("%s ENTER (%s)\n", __func__, adapter->netdev->name);

	if (netif_running(dev)) {
		return -EBUSY;
	}
	if (!adapter) {
		return -EBUSY;
	}
	DBG_ERROR("sxg: %s (%s) curr %2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X\n",
		  __func__, adapter->netdev->name, adapter->currmacaddr[0],
		  adapter->currmacaddr[1], adapter->currmacaddr[2],
		  adapter->currmacaddr[3], adapter->currmacaddr[4],
		  adapter->currmacaddr[5]);
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	memcpy(adapter->currmacaddr, addr->sa_data, dev->addr_len);
	DBG_ERROR("sxg: %s (%s) new %2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X\n",
		  __func__, adapter->netdev->name, adapter->currmacaddr[0],
		  adapter->currmacaddr[1], adapter->currmacaddr[2],
		  adapter->currmacaddr[3], adapter->currmacaddr[4],
		  adapter->currmacaddr[5]);

	sxg_config_set(adapter, TRUE);
	return 0;
}
#endif

/*
 * SXG DRIVER FUNCTIONS  (below)
 *
 * sxg_initialize_adapter - Initialize adapter
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return - int
 */
static int sxg_initialize_adapter(struct adapter_t *adapter)
{
	u32 RssIds, IsrCount;
	u32 i;
	int status;
	int sxg_rcv_ring_size = SXG_RCV_RING_SIZE;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "InitAdpt",
		  adapter, 0, 0, 0);

	RssIds = 1;		/*  XXXTODO  SXG_RSS_CPU_COUNT(adapter); */
	IsrCount = adapter->msi_enabled ? RssIds : 1;

	/*
	 * Sanity check SXG_UCODE_REGS structure definition to
	 * make sure the length is correct
	 */
	ASSERT(sizeof(struct sxg_ucode_regs) == SXG_REGISTER_SIZE_PER_CPU);

	/* Disable interrupts */
	SXG_DISABLE_ALL_INTERRUPTS(adapter);

	/* Set MTU */
	ASSERT((adapter->FrameSize == ETHERMAXFRAME) ||
	       (adapter->FrameSize == JUMBOMAXFRAME));
	WRITE_REG(adapter->UcodeRegs[0].LinkMtu, adapter->FrameSize, TRUE);

	/* Set event ring base address and size */
	WRITE_REG64(adapter,
		    adapter->UcodeRegs[0].EventBase, adapter->PEventRings, 0);
	WRITE_REG(adapter->UcodeRegs[0].EventSize, EVENT_RING_SIZE, TRUE);

	/* Per-ISR initialization */
	for (i = 0; i < IsrCount; i++) {
		u64 Addr;
		/* Set interrupt status pointer */
		Addr = adapter->PIsr + (i * sizeof(u32));
		WRITE_REG64(adapter, adapter->UcodeRegs[i].Isp, Addr, i);
	}

	/* XMT ring zero index */
	WRITE_REG64(adapter,
		    adapter->UcodeRegs[0].SPSendIndex,
		    adapter->PXmtRingZeroIndex, 0);

	/* Per-RSS initialization */
	for (i = 0; i < RssIds; i++) {
		/* Release all event ring entries to the Microcode */
		WRITE_REG(adapter->UcodeRegs[i].EventRelease, EVENT_RING_SIZE,
			  TRUE);
	}

	/* Transmit ring base and size */
	WRITE_REG64(adapter,
		    adapter->UcodeRegs[0].XmtBase, adapter->PXmtRings, 0);
	WRITE_REG(adapter->UcodeRegs[0].XmtSize, SXG_XMT_RING_SIZE, TRUE);

	/* Receive ring base and size */
	WRITE_REG64(adapter,
		    adapter->UcodeRegs[0].RcvBase, adapter->PRcvRings, 0);
	if (adapter->JumboEnabled == TRUE)
		sxg_rcv_ring_size = SXG_JUMBO_RCV_RING_SIZE;
	WRITE_REG(adapter->UcodeRegs[0].RcvSize, sxg_rcv_ring_size, TRUE);

	/* Populate the card with receive buffers */
	sxg_stock_rcv_buffers(adapter);

	/*
	 * Initialize checksum offload capabilities.  At the moment we always
	 * enable IP and TCP receive checksums on the card. Depending on the
	 * checksum configuration specified by the user, we can choose to
	 * report or ignore the checksum information provided by the card.
	 */
	WRITE_REG(adapter->UcodeRegs[0].ReceiveChecksum,
		  SXG_RCV_TCP_CSUM_ENABLED | SXG_RCV_IP_CSUM_ENABLED, TRUE);

	adapter->flags |= (SXG_RCV_TCP_CSUM_ENABLED | SXG_RCV_IP_CSUM_ENABLED );

	/* Initialize the MAC, XAUI */
	DBG_ERROR("sxg: %s ENTER sxg_initialize_link\n", __func__);
	status = sxg_initialize_link(adapter);
	DBG_ERROR("sxg: %s EXIT sxg_initialize_link status[%x]\n", __func__,
		  status);
	if (status != STATUS_SUCCESS) {
		return (status);
	}
	/*
	 * Initialize Dead to FALSE.
	 * SlicCheckForHang or SlicDumpThread will take it from here.
	 */
	adapter->Dead = FALSE;
	adapter->PingOutstanding = FALSE;
	adapter->XmtFcEnabled = TRUE;
	adapter->RcvFcEnabled = TRUE;

	adapter->State = SXG_STATE_RUNNING;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XInit",
		  adapter, 0, 0, 0);
	return (STATUS_SUCCESS);
}

/*
 * sxg_fill_descriptor_block - Populate a descriptor block and give it to
 * the card.  The caller should hold the RcvQLock
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *  RcvDescriptorBlockHdr	- Descriptor block to fill
 *
 * Return
 *	status
 */
static int sxg_fill_descriptor_block(struct adapter_t *adapter,
	     struct sxg_rcv_descriptor_block_hdr *RcvDescriptorBlockHdr)
{
	u32 i;
	struct sxg_ring_info *RcvRingInfo = &adapter->RcvRingZeroInfo;
	struct sxg_rcv_data_buffer_hdr *RcvDataBufferHdr;
	struct sxg_rcv_descriptor_block *RcvDescriptorBlock;
	struct sxg_cmd *RingDescriptorCmd;
	struct sxg_rcv_ring *RingZero = &adapter->RcvRings[0];

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "FilBlk",
		  adapter, adapter->RcvBuffersOnCard,
		  adapter->FreeRcvBufferCount, adapter->AllRcvBlockCount);

	ASSERT(RcvDescriptorBlockHdr);

	/*
	 * If we don't have the resources to fill the descriptor block,
	 * return failure
	 */
	if ((adapter->FreeRcvBufferCount < SXG_RCV_DESCRIPTORS_PER_BLOCK) ||
	    SXG_RING_FULL(RcvRingInfo)) {
		adapter->Stats.NoMem++;
		return (STATUS_FAILURE);
	}
	/* Get a ring descriptor command */
	SXG_GET_CMD(RingZero,
		    RcvRingInfo, RingDescriptorCmd, RcvDescriptorBlockHdr);
	ASSERT(RingDescriptorCmd);
	RcvDescriptorBlockHdr->State = SXG_BUFFER_ONCARD;
	RcvDescriptorBlock = (struct sxg_rcv_descriptor_block *)
				 RcvDescriptorBlockHdr->VirtualAddress;

	/* Fill in the descriptor block */
	for (i = 0; i < SXG_RCV_DESCRIPTORS_PER_BLOCK; i++) {
		SXG_GET_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr);
		ASSERT(RcvDataBufferHdr);
//		ASSERT(RcvDataBufferHdr->SxgDumbRcvPacket);
		if (!RcvDataBufferHdr->SxgDumbRcvPacket) {
			SXG_ALLOCATE_RCV_PACKET(adapter, RcvDataBufferHdr,
						adapter->ReceiveBufferSize);
			if(RcvDataBufferHdr->skb)
				RcvDataBufferHdr->SxgDumbRcvPacket =
						RcvDataBufferHdr->skb;
			else
				goto no_memory;
		}
		SXG_REINIATIALIZE_PACKET(RcvDataBufferHdr->SxgDumbRcvPacket);
		RcvDataBufferHdr->State = SXG_BUFFER_ONCARD;
		RcvDescriptorBlock->Descriptors[i].VirtualAddress =
					    (void *)RcvDataBufferHdr;

		RcvDescriptorBlock->Descriptors[i].PhysicalAddress =
		    RcvDataBufferHdr->PhysicalAddress;
	}
	/* Add the descriptor block to receive descriptor ring 0 */
	RingDescriptorCmd->Sgl = RcvDescriptorBlockHdr->PhysicalAddress;

	/*
	 * RcvBuffersOnCard is not protected via the receive lock (see
	 * sxg_process_event_queue) We don't want to grap a lock every time a
	 * buffer is returned to us, so we use atomic interlocked functions
	 * instead.
	 */
	adapter->RcvBuffersOnCard += SXG_RCV_DESCRIPTORS_PER_BLOCK;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "DscBlk",
		  RcvDescriptorBlockHdr,
		  RingDescriptorCmd, RcvRingInfo->Head, RcvRingInfo->Tail);

	WRITE_REG(adapter->UcodeRegs[0].RcvCmd, 1, true);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XFilBlk",
		  adapter, adapter->RcvBuffersOnCard,
		  adapter->FreeRcvBufferCount, adapter->AllRcvBlockCount);
	return (STATUS_SUCCESS);
no_memory:
	for (; i >= 0 ; i--) {
		if (RcvDescriptorBlock->Descriptors[i].VirtualAddress) {
			RcvDataBufferHdr = (struct sxg_rcv_data_buffer_hdr *)
					    RcvDescriptorBlock->Descriptors[i].
								VirtualAddress;
			RcvDescriptorBlock->Descriptors[i].PhysicalAddress =
					    (dma_addr_t)NULL;
			RcvDescriptorBlock->Descriptors[i].VirtualAddress=NULL;
		}
		SXG_FREE_RCV_DATA_BUFFER(adapter, RcvDataBufferHdr);
	}
	RcvDescriptorBlockHdr->State = SXG_BUFFER_FREE;
	SXG_RETURN_CMD(RingZero, RcvRingInfo, RingDescriptorCmd,
			RcvDescriptorBlockHdr);

	return (-ENOMEM);
}

/*
 * sxg_stock_rcv_buffers - Stock the card with receive buffers
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *
 * Return
 *	None
 */
static void sxg_stock_rcv_buffers(struct adapter_t *adapter)
{
	struct sxg_rcv_descriptor_block_hdr *RcvDescriptorBlockHdr;
	int sxg_rcv_data_buffers = SXG_RCV_DATA_BUFFERS;
	int sxg_min_rcv_data_buffers = SXG_MIN_RCV_DATA_BUFFERS;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "StockBuf",
		  adapter, adapter->RcvBuffersOnCard,
		  adapter->FreeRcvBufferCount, adapter->AllRcvBlockCount);
	/*
	 * First, see if we've got less than our minimum threshold of
	 * receive buffers, there isn't an allocation in progress, and
	 * we haven't exceeded our maximum.. get another block of buffers
	 * None of this needs to be SMP safe.  It's round numbers.
	 */
	if (adapter->JumboEnabled == TRUE)
		sxg_min_rcv_data_buffers = SXG_MIN_JUMBO_RCV_DATA_BUFFERS;
	if ((adapter->FreeRcvBufferCount < sxg_min_rcv_data_buffers) &&
	    (adapter->AllRcvBlockCount < SXG_MAX_RCV_BLOCKS) &&
	    (atomic_read(&adapter->pending_allocations) == 0)) {
		sxg_allocate_buffer_memory(adapter,
					   SXG_RCV_BLOCK_SIZE
					   (SXG_RCV_DATA_HDR_SIZE),
					   SXG_BUFFER_TYPE_RCV);
	}
	/* Now grab the RcvQLock lock and proceed */
	spin_lock(&adapter->RcvQLock);
	if (adapter->JumboEnabled)
		sxg_rcv_data_buffers = SXG_JUMBO_RCV_DATA_BUFFERS;
	while (adapter->RcvBuffersOnCard < sxg_rcv_data_buffers) {
		struct list_entry *_ple;

		/* Get a descriptor block */
		RcvDescriptorBlockHdr = NULL;
		if (adapter->FreeRcvBlockCount) {
			_ple = RemoveHeadList(&adapter->FreeRcvBlocks);
			RcvDescriptorBlockHdr =
			    container_of(_ple, struct sxg_rcv_descriptor_block_hdr,
					 FreeList);
			adapter->FreeRcvBlockCount--;
			RcvDescriptorBlockHdr->State = SXG_BUFFER_BUSY;
		}

		if (RcvDescriptorBlockHdr == NULL) {
			/* Bail out.. */
			adapter->Stats.NoMem++;
			break;
		}
		/* Fill in the descriptor block and give it to the card */
		if (sxg_fill_descriptor_block(adapter, RcvDescriptorBlockHdr) ==
		    STATUS_FAILURE) {
			/* Free the descriptor block */
			SXG_FREE_RCV_DESCRIPTOR_BLOCK(adapter,
						      RcvDescriptorBlockHdr);
			break;
		}
	}
	spin_unlock(&adapter->RcvQLock);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XFilBlks",
		  adapter, adapter->RcvBuffersOnCard,
		  adapter->FreeRcvBufferCount, adapter->AllRcvBlockCount);
}

/*
 * sxg_complete_descriptor_blocks - Return descriptor blocks that have been
 * completed by the microcode
 *
 * Arguments -
 *	adapter		- A pointer to our adapter structure
 *	Index		- Where the microcode is up to
 *
 * Return
 *	None
 */
static void sxg_complete_descriptor_blocks(struct adapter_t *adapter,
					   unsigned char Index)
{
	struct sxg_rcv_ring *RingZero = &adapter->RcvRings[0];
	struct sxg_ring_info *RcvRingInfo = &adapter->RcvRingZeroInfo;
	struct sxg_rcv_descriptor_block_hdr *RcvDescriptorBlockHdr;
	struct sxg_cmd *RingDescriptorCmd;

	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "CmpRBlks",
		  adapter, Index, RcvRingInfo->Head, RcvRingInfo->Tail);

	/* Now grab the RcvQLock lock and proceed */
	spin_lock(&adapter->RcvQLock);
	ASSERT(Index != RcvRingInfo->Tail);
	while (sxg_ring_get_forward_diff(RcvRingInfo, Index,
					RcvRingInfo->Tail) > 3) {
		/*
		 * Locate the current Cmd (ring descriptor entry), and
		 * associated receive descriptor block, and advance
		 * the tail
		 */
		SXG_RETURN_CMD(RingZero,
			       RcvRingInfo,
			       RingDescriptorCmd, RcvDescriptorBlockHdr);
		SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "CmpRBlk",
			  RcvRingInfo->Head, RcvRingInfo->Tail,
			  RingDescriptorCmd, RcvDescriptorBlockHdr);

		/* Clear the SGL field */
		RingDescriptorCmd->Sgl = 0;
		/*
		 * Attempt to refill it and hand it right back to the
		 * card.  If we fail to refill it, free the descriptor block
		 * header.  The card will be restocked later via the
		 * RcvBuffersOnCard test
		 */
		if (sxg_fill_descriptor_block(adapter,
			 RcvDescriptorBlockHdr) == STATUS_FAILURE)
			SXG_FREE_RCV_DESCRIPTOR_BLOCK(adapter,
						      RcvDescriptorBlockHdr);
	}
	spin_unlock(&adapter->RcvQLock);
	SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "XCRBlks",
		  adapter, Index, RcvRingInfo->Head, RcvRingInfo->Tail);
}

/*
 * Read the statistics which the card has been maintaining.
 */
void sxg_collect_statistics(struct adapter_t *adapter)
{
	if(adapter->ucode_stats)
		WRITE_REG64(adapter, adapter->UcodeRegs[0].GetUcodeStats,
				adapter->pucode_stats, 0);
	adapter->stats.rx_fifo_errors = adapter->ucode_stats->ERDrops;
	adapter->stats.rx_over_errors = adapter->ucode_stats->NBDrops;
	adapter->stats.tx_fifo_errors = adapter->ucode_stats->XDrops;
}

static struct net_device_stats *sxg_get_stats(struct net_device * dev)
{
	struct adapter_t *adapter = netdev_priv(dev);

	sxg_collect_statistics(adapter);
	return (&adapter->stats);
}

static void sxg_watchdog(unsigned long data)
{
	struct adapter_t *adapter = (struct adapter_t *) data;

	if (adapter->state != ADAPT_DOWN) {
		sxg_link_event(adapter);
		/* Reset the timer */
		mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 2 * HZ));
	}
}

static void sxg_update_link_status (struct work_struct *work)
{
	struct adapter_t *adapter = (struct adapter_t *)container_of
				(work, struct adapter_t, update_link_status);
	if (likely(adapter->link_status_changed)) {
		sxg_link_event(adapter);
		adapter->link_status_changed = 0;
	}
}

static struct pci_driver sxg_driver = {
	.name = sxg_driver_name,
	.id_table = sxg_pci_tbl,
	.probe = sxg_entry_probe,
	.remove = sxg_entry_remove,
#if SXG_POWER_MANAGEMENT_ENABLED
	.suspend = sxgpm_suspend,
	.resume = sxgpm_resume,
#endif
	/* .shutdown   =     slic_shutdown,  MOOK_INVESTIGATE */
};

static int __init sxg_module_init(void)
{
	sxg_init_driver();

	if (debug >= 0)
		sxg_debug = debug;

	return pci_register_driver(&sxg_driver);
}

static void __exit sxg_module_cleanup(void)
{
	pci_unregister_driver(&sxg_driver);
}

module_init(sxg_module_init);
module_exit(sxg_module_cleanup);