drivers/net/s2io.c

/************************************************************************
 * s2io.c: A Linux PCI-X Ethernet driver for S2IO 10GbE Server NIC
 * Copyright(c) 2002-2005 Neterion Inc.

 * This software may be used and distributed according to the terms of
 * the GNU General Public License (GPL), incorporated herein by reference.
 * Drivers based on or derived from this code fall under the GPL and must
 * retain the authorship, copyright and license notice.  This file is not
 * a complete program and may only be used when the entire operating
 * system is licensed under the GPL.
 * See the file COPYING in this distribution for more information.
 *
 * Credits:
 * Jeff Garzik		: For pointing out the improper error condition
 *			  check in the s2io_xmit routine and also some
 *			  issues in the Tx watch dog function. Also for
 *			  patiently answering all those innumerable
 *			  questions regaring the 2.6 porting issues.
 * Stephen Hemminger	: Providing proper 2.6 porting mechanism for some
 *			  macros available only in 2.6 Kernel.
 * Francois Romieu	: For pointing out all code part that were
 *			  deprecated and also styling related comments.
 * Grant Grundler	: For helping me get rid of some Architecture
 *			  dependent code.
 * Christopher Hellwig	: Some more 2.6 specific issues in the driver.
 *
 * The module loadable parameters that are supported by the driver and a brief
 * explaination of all the variables.
 * rx_ring_num : This can be used to program the number of receive rings used
 * in the driver.
 * rx_ring_len: This defines the number of descriptors each ring can have. This
 * is also an array of size 8.
 * tx_fifo_num: This defines the number of Tx FIFOs thats used int the driver.
 * tx_fifo_len: This too is an array of 8. Each element defines the number of
 * Tx descriptors that can be associated with each corresponding FIFO.
 ************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioctl.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/ethtool.h>
#include <linux/version.h>
#include <linux/workqueue.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/* local include */
#include "s2io.h"
#include "s2io-regs.h"

/* S2io Driver name & version. */
static char s2io_driver_name[] = "Neterion";
static char s2io_driver_version[] = "Version 1.7.7";

static inline int RXD_IS_UP2DT(RxD_t *rxdp)
{
	int ret;

	ret = ((!(rxdp->Control_1 & RXD_OWN_XENA)) &&
		(GET_RXD_MARKER(rxdp->Control_2) != THE_RXD_MARK));

	return ret;
}

/*
 * Cards with following subsystem_id have a link state indication
 * problem, 600B, 600C, 600D, 640B, 640C and 640D.
 * macro below identifies these cards given the subsystem_id.
 */
#define CARDS_WITH_FAULTY_LINK_INDICATORS(subid) \
		(((subid >= 0x600B) && (subid <= 0x600D)) || \
		 ((subid >= 0x640B) && (subid <= 0x640D))) ? 1 : 0

#define LINK_IS_UP(val64) (!(val64 & (ADAPTER_STATUS_RMAC_REMOTE_FAULT | \
				      ADAPTER_STATUS_RMAC_LOCAL_FAULT)))
#define TASKLET_IN_USE test_and_set_bit(0, (&sp->tasklet_status))
#define PANIC	1
#define LOW	2
static inline int rx_buffer_level(nic_t * sp, int rxb_size, int ring)
{
	int level = 0;
	mac_info_t *mac_control;

	mac_control = &sp->mac_control;
	if ((mac_control->rings[ring].pkt_cnt - rxb_size) > 16) {
		level = LOW;
		if ((mac_control->rings[ring].pkt_cnt - rxb_size) <
				MAX_RXDS_PER_BLOCK) {
			level = PANIC;
		}
	}

	return level;
}

/* Ethtool related variables and Macros. */
static char s2io_gstrings[][ETH_GSTRING_LEN] = {
	"Register test\t(offline)",
	"Eeprom test\t(offline)",
	"Link test\t(online)",
	"RLDRAM test\t(offline)",
	"BIST Test\t(offline)"
};

static char ethtool_stats_keys[][ETH_GSTRING_LEN] = {
	{"tmac_frms"},
	{"tmac_data_octets"},
	{"tmac_drop_frms"},
	{"tmac_mcst_frms"},
	{"tmac_bcst_frms"},
	{"tmac_pause_ctrl_frms"},
	{"tmac_any_err_frms"},
	{"tmac_vld_ip_octets"},
	{"tmac_vld_ip"},
	{"tmac_drop_ip"},
	{"tmac_icmp"},
	{"tmac_rst_tcp"},
	{"tmac_tcp"},
	{"tmac_udp"},
	{"rmac_vld_frms"},
	{"rmac_data_octets"},
	{"rmac_fcs_err_frms"},
	{"rmac_drop_frms"},
	{"rmac_vld_mcst_frms"},
	{"rmac_vld_bcst_frms"},
	{"rmac_in_rng_len_err_frms"},
	{"rmac_long_frms"},
	{"rmac_pause_ctrl_frms"},
	{"rmac_discarded_frms"},
	{"rmac_usized_frms"},
	{"rmac_osized_frms"},
	{"rmac_frag_frms"},
	{"rmac_jabber_frms"},
	{"rmac_ip"},
	{"rmac_ip_octets"},
	{"rmac_hdr_err_ip"},
	{"rmac_drop_ip"},
	{"rmac_icmp"},
	{"rmac_tcp"},
	{"rmac_udp"},
	{"rmac_err_drp_udp"},
	{"rmac_pause_cnt"},
	{"rmac_accepted_ip"},
	{"rmac_err_tcp"},
	{"\n DRIVER STATISTICS"},
	{"single_bit_ecc_errs"},
	{"double_bit_ecc_errs"},
};

#define S2IO_STAT_LEN sizeof(ethtool_stats_keys)/ ETH_GSTRING_LEN
#define S2IO_STAT_STRINGS_LEN S2IO_STAT_LEN * ETH_GSTRING_LEN

#define S2IO_TEST_LEN	sizeof(s2io_gstrings) / ETH_GSTRING_LEN
#define S2IO_STRINGS_LEN	S2IO_TEST_LEN * ETH_GSTRING_LEN

/*
 * Constants to be programmed into the Xena's registers, to configure
 * the XAUI.
 */

#define SWITCH_SIGN	0xA5A5A5A5A5A5A5A5ULL
#define	END_SIGN	0x0

static u64 default_mdio_cfg[] = {
	/* Reset PMA PLL */
	0xC001010000000000ULL, 0xC0010100000000E0ULL,
	0xC0010100008000E4ULL,
	/* Remove Reset from PMA PLL */
	0xC001010000000000ULL, 0xC0010100000000E0ULL,
	0xC0010100000000E4ULL,
	END_SIGN
};

static u64 default_dtx_cfg[] = {
	0x8000051500000000ULL, 0x80000515000000E0ULL,
	0x80000515D93500E4ULL, 0x8001051500000000ULL,
	0x80010515000000E0ULL, 0x80010515001E00E4ULL,
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515F21000E4ULL,
	/* Set PADLOOPBACKN */
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515B20000E4ULL, 0x8003051500000000ULL,
	0x80030515000000E0ULL, 0x80030515B20000E4ULL,
	0x8004051500000000ULL, 0x80040515000000E0ULL,
	0x80040515B20000E4ULL, 0x8005051500000000ULL,
	0x80050515000000E0ULL, 0x80050515B20000E4ULL,
	SWITCH_SIGN,
	/* Remove PADLOOPBACKN */
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515F20000E4ULL, 0x8003051500000000ULL,
	0x80030515000000E0ULL, 0x80030515F20000E4ULL,
	0x8004051500000000ULL, 0x80040515000000E0ULL,
	0x80040515F20000E4ULL, 0x8005051500000000ULL,
	0x80050515000000E0ULL, 0x80050515F20000E4ULL,
	END_SIGN
};

/*
 * Constants for Fixing the MacAddress problem seen mostly on
 * Alpha machines.
 */
static u64 fix_mac[] = {
	0x0060000000000000ULL, 0x0060600000000000ULL,
	0x0040600000000000ULL, 0x0000600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0000600000000000ULL,
	0x0040600000000000ULL, 0x0060600000000000ULL,
	END_SIGN
};

/* Module Loadable parameters. */
static unsigned int tx_fifo_num = 1;
static unsigned int tx_fifo_len[MAX_TX_FIFOS] =
    {[0 ...(MAX_TX_FIFOS - 1)] = 0 };
static unsigned int rx_ring_num = 1;
static unsigned int rx_ring_sz[MAX_RX_RINGS] =
    {[0 ...(MAX_RX_RINGS - 1)] = 0 };
static unsigned int rts_frm_len[MAX_RX_RINGS] =
    {[0 ...(MAX_RX_RINGS - 1)] = 0 };
static unsigned int use_continuous_tx_intrs = 1;
static unsigned int rmac_pause_time = 65535;
static unsigned int mc_pause_threshold_q0q3 = 187;
static unsigned int mc_pause_threshold_q4q7 = 187;
static unsigned int shared_splits;
static unsigned int tmac_util_period = 5;
static unsigned int rmac_util_period = 5;
#ifndef CONFIG_S2IO_NAPI
static unsigned int indicate_max_pkts;
#endif

/*
 * S2IO device table.
 * This table lists all the devices that this driver supports.
 */
static struct pci_device_id s2io_tbl[] __devinitdata = {
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_S2IO_WIN,
	 PCI_ANY_ID, PCI_ANY_ID},
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_S2IO_UNI,
	 PCI_ANY_ID, PCI_ANY_ID},
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_HERC_WIN,
         PCI_ANY_ID, PCI_ANY_ID},
        {PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_HERC_UNI,
         PCI_ANY_ID, PCI_ANY_ID},
	{0,}
};

MODULE_DEVICE_TABLE(pci, s2io_tbl);

static struct pci_driver s2io_driver = {
      .name = "S2IO",
      .id_table = s2io_tbl,
      .probe = s2io_init_nic,
      .remove = __devexit_p(s2io_rem_nic),
};

/* A simplifier macro used both by init and free shared_mem Fns(). */
#define TXD_MEM_PAGE_CNT(len, per_each) ((len+per_each - 1) / per_each)

/**
 * init_shared_mem - Allocation and Initialization of Memory
 * @nic: Device private variable.
 * Description: The function allocates all the memory areas shared
 * between the NIC and the driver. This includes Tx descriptors,
 * Rx descriptors and the statistics block.
 */

static int init_shared_mem(struct s2io_nic *nic)
{
	u32 size;
	void *tmp_v_addr, *tmp_v_addr_next;
	dma_addr_t tmp_p_addr, tmp_p_addr_next;
	RxD_block_t *pre_rxd_blk = NULL;
	int i, j, blk_cnt, rx_sz, tx_sz;
	int lst_size, lst_per_page;
	struct net_device *dev = nic->dev;
#ifdef CONFIG_2BUFF_MODE
	u64 tmp;
	buffAdd_t *ba;
#endif

	mac_info_t *mac_control;
	struct config_param *config;

	mac_control = &nic->mac_control;
	config = &nic->config;


	/* Allocation and initialization of TXDLs in FIOFs */
	size = 0;
	for (i = 0; i < config->tx_fifo_num; i++) {
		size += config->tx_cfg[i].fifo_len;
	}
	if (size > MAX_AVAILABLE_TXDS) {
		DBG_PRINT(ERR_DBG, "%s: Total number of Tx FIFOs ",
			  dev->name);
		DBG_PRINT(ERR_DBG, "exceeds the maximum value ");
		DBG_PRINT(ERR_DBG, "that can be used\n");
		return FAILURE;
	}

	lst_size = (sizeof(TxD_t) * config->max_txds);
	tx_sz = lst_size * size;
	lst_per_page = PAGE_SIZE / lst_size;

	for (i = 0; i < config->tx_fifo_num; i++) {
		int fifo_len = config->tx_cfg[i].fifo_len;
		int list_holder_size = fifo_len * sizeof(list_info_hold_t);
		mac_control->fifos[i].list_info = kmalloc(list_holder_size,
							  GFP_KERNEL);
		if (!mac_control->fifos[i].list_info) {
			DBG_PRINT(ERR_DBG,
				  "Malloc failed for list_info\n");
			return -ENOMEM;
		}
		memset(mac_control->fifos[i].list_info, 0, list_holder_size);
	}
	for (i = 0; i < config->tx_fifo_num; i++) {
		int page_num = TXD_MEM_PAGE_CNT(config->tx_cfg[i].fifo_len,
						lst_per_page);
		mac_control->fifos[i].tx_curr_put_info.offset = 0;
		mac_control->fifos[i].tx_curr_put_info.fifo_len =
		    config->tx_cfg[i].fifo_len - 1;
		mac_control->fifos[i].tx_curr_get_info.offset = 0;
		mac_control->fifos[i].tx_curr_get_info.fifo_len =
		    config->tx_cfg[i].fifo_len - 1;
		mac_control->fifos[i].fifo_no = i;
		mac_control->fifos[i].nic = nic;
		mac_control->fifos[i].max_txds = MAX_SKB_FRAGS;

		for (j = 0; j < page_num; j++) {
			int k = 0;
			dma_addr_t tmp_p;
			void *tmp_v;
			tmp_v = pci_alloc_consistent(nic->pdev,
						     PAGE_SIZE, &tmp_p);
			if (!tmp_v) {
				DBG_PRINT(ERR_DBG,
					  "pci_alloc_consistent ");
				DBG_PRINT(ERR_DBG, "failed for TxDL\n");
				return -ENOMEM;
			}
			while (k < lst_per_page) {
				int l = (j * lst_per_page) + k;
				if (l == config->tx_cfg[i].fifo_len)
					break;
				mac_control->fifos[i].list_info[l].list_virt_addr =
				    tmp_v + (k * lst_size);
				mac_control->fifos[i].list_info[l].list_phy_addr =
				    tmp_p + (k * lst_size);
				k++;
			}
		}
	}

	/* Allocation and initialization of RXDs in Rings */
	size = 0;
	for (i = 0; i < config->rx_ring_num; i++) {
		if (config->rx_cfg[i].num_rxd % (MAX_RXDS_PER_BLOCK + 1)) {
			DBG_PRINT(ERR_DBG, "%s: RxD count of ", dev->name);
			DBG_PRINT(ERR_DBG, "Ring%d is not a multiple of ",
				  i);
			DBG_PRINT(ERR_DBG, "RxDs per Block");
			return FAILURE;
		}
		size += config->rx_cfg[i].num_rxd;
		mac_control->rings[i].block_count =
		    config->rx_cfg[i].num_rxd / (MAX_RXDS_PER_BLOCK + 1);
		mac_control->rings[i].pkt_cnt =
		    config->rx_cfg[i].num_rxd - mac_control->rings[i].block_count;
	}
	size = (size * (sizeof(RxD_t)));
	rx_sz = size;

	for (i = 0; i < config->rx_ring_num; i++) {
		mac_control->rings[i].rx_curr_get_info.block_index = 0;
		mac_control->rings[i].rx_curr_get_info.offset = 0;
		mac_control->rings[i].rx_curr_get_info.ring_len =
		    config->rx_cfg[i].num_rxd - 1;
		mac_control->rings[i].rx_curr_put_info.block_index = 0;
		mac_control->rings[i].rx_curr_put_info.offset = 0;
		mac_control->rings[i].rx_curr_put_info.ring_len =
		    config->rx_cfg[i].num_rxd - 1;
		mac_control->rings[i].nic = nic;
		mac_control->rings[i].ring_no = i;

		blk_cnt =
		    config->rx_cfg[i].num_rxd / (MAX_RXDS_PER_BLOCK + 1);
		/*  Allocating all the Rx blocks */
		for (j = 0; j < blk_cnt; j++) {
#ifndef CONFIG_2BUFF_MODE
			size = (MAX_RXDS_PER_BLOCK + 1) * (sizeof(RxD_t));
#else
			size = SIZE_OF_BLOCK;
#endif
			tmp_v_addr = pci_alloc_consistent(nic->pdev, size,
							  &tmp_p_addr);
			if (tmp_v_addr == NULL) {
				/*
				 * In case of failure, free_shared_mem()
				 * is called, which should free any
				 * memory that was alloced till the
				 * failure happened.
				 */
				mac_control->rings[i].rx_blocks[j].block_virt_addr =
				    tmp_v_addr;
				return -ENOMEM;
			}
			memset(tmp_v_addr, 0, size);
			mac_control->rings[i].rx_blocks[j].block_virt_addr =
				tmp_v_addr;
			mac_control->rings[i].rx_blocks[j].block_dma_addr =
				tmp_p_addr;
		}
		/* Interlinking all Rx Blocks */
		for (j = 0; j < blk_cnt; j++) {
			tmp_v_addr =
				mac_control->rings[i].rx_blocks[j].block_virt_addr;
			tmp_v_addr_next =
				mac_control->rings[i].rx_blocks[(j + 1) %
					      blk_cnt].block_virt_addr;
			tmp_p_addr =
				mac_control->rings[i].rx_blocks[j].block_dma_addr;
			tmp_p_addr_next =
				mac_control->rings[i].rx_blocks[(j + 1) %
					      blk_cnt].block_dma_addr;

			pre_rxd_blk = (RxD_block_t *) tmp_v_addr;
			pre_rxd_blk->reserved_1 = END_OF_BLOCK;	/* last RxD
								 * marker.
								 */
#ifndef	CONFIG_2BUFF_MODE
			pre_rxd_blk->reserved_2_pNext_RxD_block =
			    (unsigned long) tmp_v_addr_next;
#endif
			pre_rxd_blk->pNext_RxD_Blk_physical =
			    (u64) tmp_p_addr_next;
		}
	}

#ifdef CONFIG_2BUFF_MODE
	/*
	 * Allocation of Storages for buffer addresses in 2BUFF mode
	 * and the buffers as well.
	 */
	for (i = 0; i < config->rx_ring_num; i++) {
		blk_cnt =
		    config->rx_cfg[i].num_rxd / (MAX_RXDS_PER_BLOCK + 1);
		mac_control->rings[i].ba = kmalloc((sizeof(buffAdd_t *) * blk_cnt),
				     GFP_KERNEL);
		if (!mac_control->rings[i].ba)
			return -ENOMEM;
		for (j = 0; j < blk_cnt; j++) {
			int k = 0;
			mac_control->rings[i].ba[j] = kmalloc((sizeof(buffAdd_t) *
						 (MAX_RXDS_PER_BLOCK + 1)),
						GFP_KERNEL);
			if (!mac_control->rings[i].ba[j])
				return -ENOMEM;
			while (k != MAX_RXDS_PER_BLOCK) {
				ba = &mac_control->rings[i].ba[j][k];

				ba->ba_0_org = (void *) kmalloc
				    (BUF0_LEN + ALIGN_SIZE, GFP_KERNEL);
				if (!ba->ba_0_org)
					return -ENOMEM;
				tmp = (u64) ba->ba_0_org;
				tmp += ALIGN_SIZE;
				tmp &= ~((u64) ALIGN_SIZE);
				ba->ba_0 = (void *) tmp;

				ba->ba_1_org = (void *) kmalloc
				    (BUF1_LEN + ALIGN_SIZE, GFP_KERNEL);
				if (!ba->ba_1_org)
					return -ENOMEM;
				tmp = (u64) ba->ba_1_org;
				tmp += ALIGN_SIZE;
				tmp &= ~((u64) ALIGN_SIZE);
				ba->ba_1 = (void *) tmp;
				k++;
			}
		}
	}
#endif

	/* Allocation and initialization of Statistics block */
	size = sizeof(StatInfo_t);
	mac_control->stats_mem = pci_alloc_consistent
	    (nic->pdev, size, &mac_control->stats_mem_phy);

	if (!mac_control->stats_mem) {
		/*
		 * In case of failure, free_shared_mem() is called, which
		 * should free any memory that was alloced till the
		 * failure happened.
		 */
		return -ENOMEM;
	}
	mac_control->stats_mem_sz = size;

	tmp_v_addr = mac_control->stats_mem;
	mac_control->stats_info = (StatInfo_t *) tmp_v_addr;
	memset(tmp_v_addr, 0, size);
	DBG_PRINT(INIT_DBG, "%s:Ring Mem PHY: 0x%llx\n", dev->name,
		  (unsigned long long) tmp_p_addr);

	return SUCCESS;
}

/**
 * free_shared_mem - Free the allocated Memory
 * @nic:  Device private variable.
 * Description: This function is to free all memory locations allocated by
 * the init_shared_mem() function and return it to the kernel.
 */

static void free_shared_mem(struct s2io_nic *nic)
{
	int i, j, blk_cnt, size;
	void *tmp_v_addr;
	dma_addr_t tmp_p_addr;
	mac_info_t *mac_control;
	struct config_param *config;
	int lst_size, lst_per_page;


	if (!nic)
		return;

	mac_control = &nic->mac_control;
	config = &nic->config;

	lst_size = (sizeof(TxD_t) * config->max_txds);
	lst_per_page = PAGE_SIZE / lst_size;

	for (i = 0; i < config->tx_fifo_num; i++) {
		int page_num = TXD_MEM_PAGE_CNT(config->tx_cfg[i].fifo_len,
						lst_per_page);
		for (j = 0; j < page_num; j++) {
			int mem_blks = (j * lst_per_page);
			if (!mac_control->fifos[i].list_info[mem_blks].
			    list_virt_addr)
				break;
			pci_free_consistent(nic->pdev, PAGE_SIZE,
					    mac_control->fifos[i].
					    list_info[mem_blks].
					    list_virt_addr,
					    mac_control->fifos[i].
					    list_info[mem_blks].
					    list_phy_addr);
		}
		kfree(mac_control->fifos[i].list_info);
	}

#ifndef CONFIG_2BUFF_MODE
	size = (MAX_RXDS_PER_BLOCK + 1) * (sizeof(RxD_t));
#else
	size = SIZE_OF_BLOCK;
#endif
	for (i = 0; i < config->rx_ring_num; i++) {
		blk_cnt = mac_control->rings[i].block_count;
		for (j = 0; j < blk_cnt; j++) {
			tmp_v_addr = mac_control->rings[i].rx_blocks[j].
				block_virt_addr;
			tmp_p_addr = mac_control->rings[i].rx_blocks[j].
				block_dma_addr;
			if (tmp_v_addr == NULL)
				break;
			pci_free_consistent(nic->pdev, size,
					    tmp_v_addr, tmp_p_addr);
		}
	}

#ifdef CONFIG_2BUFF_MODE
	/* Freeing buffer storage addresses in 2BUFF mode. */
	for (i = 0; i < config->rx_ring_num; i++) {
		blk_cnt =
		    config->rx_cfg[i].num_rxd / (MAX_RXDS_PER_BLOCK + 1);
		for (j = 0; j < blk_cnt; j++) {
			int k = 0;
			if (!mac_control->rings[i].ba[j])
				continue;
			while (k != MAX_RXDS_PER_BLOCK) {
				buffAdd_t *ba = &mac_control->rings[i].ba[j][k];
				kfree(ba->ba_0_org);
				kfree(ba->ba_1_org);
				k++;
			}
			kfree(mac_control->rings[i].ba[j]);
		}
		if (mac_control->rings[i].ba)
			kfree(mac_control->rings[i].ba);
	}
#endif

	if (mac_control->stats_mem) {
		pci_free_consistent(nic->pdev,
				    mac_control->stats_mem_sz,
				    mac_control->stats_mem,
				    mac_control->stats_mem_phy);
	}
}

/**
 *  init_nic - Initialization of hardware
 *  @nic: device peivate variable
 *  Description: The function sequentially configures every block
 *  of the H/W from their reset values.
 *  Return Value:  SUCCESS on success and
 *  '-1' on failure (endian settings incorrect).
 */

static int init_nic(struct s2io_nic *nic)
{
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	struct net_device *dev = nic->dev;
	register u64 val64 = 0;
	void __iomem *add;
	u32 time;
	int i, j;
	mac_info_t *mac_control;
	struct config_param *config;
	int mdio_cnt = 0, dtx_cnt = 0;
	unsigned long long mem_share;
	int mem_size;

	mac_control = &nic->mac_control;
	config = &nic->config;

	/* to set the swapper controle on the card */
	if(s2io_set_swapper(nic)) {
		DBG_PRINT(ERR_DBG,"ERROR: Setting Swapper failed\n");
		return -1;
	}

	/* Remove XGXS from reset state */
	val64 = 0;
	writeq(val64, &bar0->sw_reset);
	msleep(500);
	val64 = readq(&bar0->sw_reset);

	/*  Enable Receiving broadcasts */
	add = &bar0->mac_cfg;
	val64 = readq(&bar0->mac_cfg);
	val64 |= MAC_RMAC_BCAST_ENABLE;
	writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
	writel((u32) val64, add);
	writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
	writel((u32) (val64 >> 32), (add + 4));

	/* Read registers in all blocks */
	val64 = readq(&bar0->mac_int_mask);
	val64 = readq(&bar0->mc_int_mask);
	val64 = readq(&bar0->xgxs_int_mask);

	/*  Set MTU */
	val64 = dev->mtu;
	writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);

	/*
	 * Configuring the XAUI Interface of Xena.
	 * ***************************************
	 * To Configure the Xena's XAUI, one has to write a series
	 * of 64 bit values into two registers in a particular
	 * sequence. Hence a macro 'SWITCH_SIGN' has been defined
	 * which will be defined in the array of configuration values
	 * (default_dtx_cfg & default_mdio_cfg) at appropriate places
	 * to switch writing from one regsiter to another. We continue
	 * writing these values until we encounter the 'END_SIGN' macro.
	 * For example, After making a series of 21 writes into
	 * dtx_control register the 'SWITCH_SIGN' appears and hence we
	 * start writing into mdio_control until we encounter END_SIGN.
	 */
	while (1) {
	      dtx_cfg:
		while (default_dtx_cfg[dtx_cnt] != END_SIGN) {
			if (default_dtx_cfg[dtx_cnt] == SWITCH_SIGN) {
				dtx_cnt++;
				goto mdio_cfg;
			}
			SPECIAL_REG_WRITE(default_dtx_cfg[dtx_cnt],
					  &bar0->dtx_control, UF);
			val64 = readq(&bar0->dtx_control);
			dtx_cnt++;
		}
	      mdio_cfg:
		while (default_mdio_cfg[mdio_cnt] != END_SIGN) {
			if (default_mdio_cfg[mdio_cnt] == SWITCH_SIGN) {
				mdio_cnt++;
				goto dtx_cfg;
			}
			SPECIAL_REG_WRITE(default_mdio_cfg[mdio_cnt],
					  &bar0->mdio_control, UF);
			val64 = readq(&bar0->mdio_control);
			mdio_cnt++;
		}
		if ((default_dtx_cfg[dtx_cnt] == END_SIGN) &&
		    (default_mdio_cfg[mdio_cnt] == END_SIGN)) {
			break;
		} else {
			goto dtx_cfg;
		}
	}

	/*  Tx DMA Initialization */
	val64 = 0;
	writeq(val64, &bar0->tx_fifo_partition_0);
	writeq(val64, &bar0->tx_fifo_partition_1);
	writeq(val64, &bar0->tx_fifo_partition_2);
	writeq(val64, &bar0->tx_fifo_partition_3);


	for (i = 0, j = 0; i < config->tx_fifo_num; i++) {
		val64 |=
		    vBIT(config->tx_cfg[i].fifo_len - 1, ((i * 32) + 19),
			 13) | vBIT(config->tx_cfg[i].fifo_priority,
				    ((i * 32) + 5), 3);

		if (i == (config->tx_fifo_num - 1)) {
			if (i % 2 == 0)
				i++;
		}

		switch (i) {
		case 1:
			writeq(val64, &bar0->tx_fifo_partition_0);
			val64 = 0;
			break;
		case 3:
			writeq(val64, &bar0->tx_fifo_partition_1);
			val64 = 0;
			break;
		case 5:
			writeq(val64, &bar0->tx_fifo_partition_2);
			val64 = 0;
			break;
		case 7:
			writeq(val64, &bar0->tx_fifo_partition_3);
			break;
		}
	}

	/* Enable Tx FIFO partition 0. */
	val64 = readq(&bar0->tx_fifo_partition_0);
	val64 |= BIT(0);	/* To enable the FIFO partition. */
	writeq(val64, &bar0->tx_fifo_partition_0);

	/*
	 * Disable 4 PCCs for Xena1, 2 and 3 as per H/W bug
	 * SXE-008 TRANSMIT DMA ARBITRATION ISSUE.
	 */
	if (get_xena_rev_id(nic->pdev) < 4)
		writeq(PCC_ENABLE_FOUR, &bar0->pcc_enable);

	val64 = readq(&bar0->tx_fifo_partition_0);
	DBG_PRINT(INIT_DBG, "Fifo partition at: 0x%p is: 0x%llx\n",
		  &bar0->tx_fifo_partition_0, (unsigned long long) val64);

	/*
	 * Initialization of Tx_PA_CONFIG register to ignore packet
	 * integrity checking.
	 */
	val64 = readq(&bar0->tx_pa_cfg);
	val64 |= TX_PA_CFG_IGNORE_FRM_ERR | TX_PA_CFG_IGNORE_SNAP_OUI |
	    TX_PA_CFG_IGNORE_LLC_CTRL | TX_PA_CFG_IGNORE_L2_ERR;
	writeq(val64, &bar0->tx_pa_cfg);

	/* Rx DMA intialization. */
	val64 = 0;
	for (i = 0; i < config->rx_ring_num; i++) {
		val64 |=
		    vBIT(config->rx_cfg[i].ring_priority, (5 + (i * 8)),
			 3);
	}
	writeq(val64, &bar0->rx_queue_priority);

	/*
	 * Allocating equal share of memory to all the
	 * configured Rings.
	 */
	val64 = 0;
	mem_size = 64;
	for (i = 0; i < config->rx_ring_num; i++) {
		switch (i) {
		case 0:
			mem_share = (mem_size / config->rx_ring_num +
				     mem_size % config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q0_SZ(mem_share);
			continue;
		case 1:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q1_SZ(mem_share);
			continue;
		case 2:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q2_SZ(mem_share);
			continue;
		case 3:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q3_SZ(mem_share);
			continue;
		case 4:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q4_SZ(mem_share);
			continue;
		case 5:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q5_SZ(mem_share);
			continue;
		case 6:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q6_SZ(mem_share);
			continue;
		case 7:
			mem_share = (mem_size / config->rx_ring_num);
			val64 |= RX_QUEUE_CFG_Q7_SZ(mem_share);
			continue;
		}
	}
	writeq(val64, &bar0->rx_queue_cfg);

	/*
	 * Filling Tx round robin registers
	 * as per the number of FIFOs
	 */
	switch (config->tx_fifo_num) {
	case 1:
		val64 = 0x0000000000000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		writeq(val64, &bar0->tx_w_round_robin_1);
		writeq(val64, &bar0->tx_w_round_robin_2);
		writeq(val64, &bar0->tx_w_round_robin_3);
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 2:
		val64 = 0x0000010000010000ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0100000100000100ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0001000001000001ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0000010000010000ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0100000000000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 3:
		val64 = 0x0001000102000001ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0001020000010001ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0200000100010200ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0001000102000001ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0001020000000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 4:
		val64 = 0x0001020300010200ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0100000102030001ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0200010000010203ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0001020001000001ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0203000100000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 5:
		val64 = 0x0001000203000102ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0001020001030004ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0001000203000102ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0001020001030004ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0001000000000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 6:
		val64 = 0x0001020304000102ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0304050001020001ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0203000100000102ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0304000102030405ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0001000200000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 7:
		val64 = 0x0001020001020300ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0102030400010203ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0405060001020001ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0304050000010200ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0102030000000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	case 8:
		val64 = 0x0001020300040105ULL;
		writeq(val64, &bar0->tx_w_round_robin_0);
		val64 = 0x0200030106000204ULL;
		writeq(val64, &bar0->tx_w_round_robin_1);
		val64 = 0x0103000502010007ULL;
		writeq(val64, &bar0->tx_w_round_robin_2);
		val64 = 0x0304010002060500ULL;
		writeq(val64, &bar0->tx_w_round_robin_3);
		val64 = 0x0103020400000000ULL;
		writeq(val64, &bar0->tx_w_round_robin_4);
		break;
	}

	/* Filling the Rx round robin registers as per the
	 * number of Rings and steering based on QoS.
         */
	switch (config->rx_ring_num) {
	case 1:
		val64 = 0x8080808080808080ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 2:
		val64 = 0x0000010000010000ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0100000100000100ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0001000001000001ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0000010000010000ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0100000000000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080808040404040ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 3:
		val64 = 0x0001000102000001ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0001020000010001ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0200000100010200ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0001000102000001ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0001020000000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080804040402020ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 4:
		val64 = 0x0001020300010200ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0100000102030001ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0200010000010203ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0001020001000001ULL;	
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0203000100000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080404020201010ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 5:
		val64 = 0x0001000203000102ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0001020001030004ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0001000203000102ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0001020001030004ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0001000000000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080404020201008ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 6:
		val64 = 0x0001020304000102ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0304050001020001ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0203000100000102ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0304000102030405ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0001000200000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080404020100804ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 7:
		val64 = 0x0001020001020300ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0102030400010203ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0405060001020001ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0304050000010200ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0102030000000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8080402010080402ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	case 8:
		val64 = 0x0001020300040105ULL;
		writeq(val64, &bar0->rx_w_round_robin_0);
		val64 = 0x0200030106000204ULL;
		writeq(val64, &bar0->rx_w_round_robin_1);
		val64 = 0x0103000502010007ULL;
		writeq(val64, &bar0->rx_w_round_robin_2);
		val64 = 0x0304010002060500ULL;
		writeq(val64, &bar0->rx_w_round_robin_3);
		val64 = 0x0103020400000000ULL;
		writeq(val64, &bar0->rx_w_round_robin_4);

		val64 = 0x8040201008040201ULL;
		writeq(val64, &bar0->rts_qos_steering);
		break;
	}

	/* UDP Fix */
	val64 = 0;
	for (i = 0; i < 8; i++)
		writeq(val64, &bar0->rts_frm_len_n[i]);

	/* Set the default rts frame length for the rings configured */
	val64 = MAC_RTS_FRM_LEN_SET(dev->mtu+22);
	for (i = 0 ; i < config->rx_ring_num ; i++)
		writeq(val64, &bar0->rts_frm_len_n[i]);

	/* Set the frame length for the configured rings
	 * desired by the user
	 */
	for (i = 0; i < config->rx_ring_num; i++) {
		/* If rts_frm_len[i] == 0 then it is assumed that user not
		 * specified frame length steering.
		 * If the user provides the frame length then program
		 * the rts_frm_len register for those values or else
		 * leave it as it is.
		 */
		if (rts_frm_len[i] != 0) {
			writeq(MAC_RTS_FRM_LEN_SET(rts_frm_len[i]),
				&bar0->rts_frm_len_n[i]);
		}
	}

	/* Program statistics memory */
	writeq(mac_control->stats_mem_phy, &bar0->stat_addr);

	/*
	 * Initializing the sampling rate for the device to calculate the
	 * bandwidth utilization.
	 */
	val64 = MAC_TX_LINK_UTIL_VAL(tmac_util_period) |
	    MAC_RX_LINK_UTIL_VAL(rmac_util_period);
	writeq(val64, &bar0->mac_link_util);


	/*
	 * Initializing the Transmit and Receive Traffic Interrupt
	 * Scheme.
	 */
	/*
	 * TTI Initialization. Default Tx timer gets us about
	 * 250 interrupts per sec. Continuous interrupts are enabled
	 * by default.
	 */
	val64 = TTI_DATA1_MEM_TX_TIMER_VAL(0x2078) |
	    TTI_DATA1_MEM_TX_URNG_A(0xA) |
	    TTI_DATA1_MEM_TX_URNG_B(0x10) |
	    TTI_DATA1_MEM_TX_URNG_C(0x30) | TTI_DATA1_MEM_TX_TIMER_AC_EN;
	if (use_continuous_tx_intrs)
		val64 |= TTI_DATA1_MEM_TX_TIMER_CI_EN;
	writeq(val64, &bar0->tti_data1_mem);

	val64 = TTI_DATA2_MEM_TX_UFC_A(0x10) |
	    TTI_DATA2_MEM_TX_UFC_B(0x20) |
	    TTI_DATA2_MEM_TX_UFC_C(0x70) | TTI_DATA2_MEM_TX_UFC_D(0x80);
	writeq(val64, &bar0->tti_data2_mem);

	val64 = TTI_CMD_MEM_WE | TTI_CMD_MEM_STROBE_NEW_CMD;
	writeq(val64, &bar0->tti_command_mem);

	/*
	 * Once the operation completes, the Strobe bit of the command
	 * register will be reset. We poll for this particular condition
	 * We wait for a maximum of 500ms for the operation to complete,
	 * if it's not complete by then we return error.
	 */
	time = 0;
	while (TRUE) {
		val64 = readq(&bar0->tti_command_mem);
		if (!(val64 & TTI_CMD_MEM_STROBE_NEW_CMD)) {
			break;
		}
		if (time > 10) {
			DBG_PRINT(ERR_DBG, "%s: TTI init Failed\n",
				  dev->name);
			return -1;
		}
		msleep(50);
		time++;
	}

	/* RTI Initialization */
	val64 = RTI_DATA1_MEM_RX_TIMER_VAL(0xFFF) |
	    RTI_DATA1_MEM_RX_URNG_A(0xA) |
	    RTI_DATA1_MEM_RX_URNG_B(0x10) |
	    RTI_DATA1_MEM_RX_URNG_C(0x30) | RTI_DATA1_MEM_RX_TIMER_AC_EN;

	writeq(val64, &bar0->rti_data1_mem);

	val64 = RTI_DATA2_MEM_RX_UFC_A(0x1) |
	    RTI_DATA2_MEM_RX_UFC_B(0x2) |
	    RTI_DATA2_MEM_RX_UFC_C(0x40) | RTI_DATA2_MEM_RX_UFC_D(0x80);
	writeq(val64, &bar0->rti_data2_mem);

	val64 = RTI_CMD_MEM_WE | RTI_CMD_MEM_STROBE_NEW_CMD;
	writeq(val64, &bar0->rti_command_mem);

	/*
	 * Once the operation completes, the Strobe bit of the
	 * command register will be reset. We poll for this
	 * particular condition. We wait for a maximum of 500ms
	 * for the operation to complete, if it's not complete
	 * by then we return error.
	 */
	time = 0;
	while (TRUE) {
		val64 = readq(&bar0->rti_command_mem);
		if (!(val64 & RTI_CMD_MEM_STROBE_NEW_CMD)) {
			break;
		}
		if (time > 10) {
			DBG_PRINT(ERR_DBG, "%s: RTI init Failed\n",
				  dev->name);
			return -1;
		}
		time++;
		msleep(50);
	}

	/*
	 * Initializing proper values as Pause threshold into all
	 * the 8 Queues on Rx side.
	 */
	writeq(0xffbbffbbffbbffbbULL, &bar0->mc_pause_thresh_q0q3);
	writeq(0xffbbffbbffbbffbbULL, &bar0->mc_pause_thresh_q4q7);

	/* Disable RMAC PAD STRIPPING */
	add = (void *) &bar0->mac_cfg;
	val64 = readq(&bar0->mac_cfg);
	val64 &= ~(MAC_CFG_RMAC_STRIP_PAD);
	writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
	writel((u32) (val64), add);
	writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
	writel((u32) (val64 >> 32), (add + 4));
	val64 = readq(&bar0->mac_cfg);

	/*
	 * Set the time value to be inserted in the pause frame
	 * generated by xena.
	 */
	val64 = readq(&bar0->rmac_pause_cfg);
	val64 &= ~(RMAC_PAUSE_HG_PTIME(0xffff));
	val64 |= RMAC_PAUSE_HG_PTIME(nic->mac_control.rmac_pause_time);
	writeq(val64, &bar0->rmac_pause_cfg);

	/*
	 * Set the Threshold Limit for Generating the pause frame
	 * If the amount of data in any Queue exceeds ratio of
	 * (mac_control.mc_pause_threshold_q0q3 or q4q7)/256
	 * pause frame is generated
	 */
	val64 = 0;
	for (i = 0; i < 4; i++) {
		val64 |=
		    (((u64) 0xFF00 | nic->mac_control.
		      mc_pause_threshold_q0q3)
		     << (i * 2 * 8));
	}
	writeq(val64, &bar0->mc_pause_thresh_q0q3);

	val64 = 0;
	for (i = 0; i < 4; i++) {
		val64 |=
		    (((u64) 0xFF00 | nic->mac_control.
		      mc_pause_threshold_q4q7)
		     << (i * 2 * 8));
	}
	writeq(val64, &bar0->mc_pause_thresh_q4q7);

	/*
	 * TxDMA will stop Read request if the number of read split has
	 * exceeded the limit pointed by shared_splits
	 */
	val64 = readq(&bar0->pic_control);
	val64 |= PIC_CNTL_SHARED_SPLITS(shared_splits);
	writeq(val64, &bar0->pic_control);

	return SUCCESS;
}

/**
 *  en_dis_able_nic_intrs - Enable or Disable the interrupts
 *  @nic: device private variable,
 *  @mask: A mask indicating which Intr block must be modified and,
 *  @flag: A flag indicating whether to enable or disable the Intrs.
 *  Description: This function will either disable or enable the interrupts
 *  depending on the flag argument. The mask argument can be used to
 *  enable/disable any Intr block.
 *  Return Value: NONE.
 */

static void en_dis_able_nic_intrs(struct s2io_nic *nic, u16 mask, int flag)
{
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	register u64 val64 = 0, temp64 = 0;

	/*  Top level interrupt classification */
	/*  PIC Interrupts */
	if ((mask & (TX_PIC_INTR | RX_PIC_INTR))) {
		/*  Enable PIC Intrs in the general intr mask register */
		val64 = TXPIC_INT_M | PIC_RX_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * Disabled all PCIX, Flash, MDIO, IIC and GPIO
			 * interrupts for now.
			 * TODO
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->pic_int_mask);
			/*
			 * No MSI Support is available presently, so TTI and
			 * RTI interrupts are also disabled.
			 */
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable PIC Intrs in the general
			 * intr mask register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->pic_int_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  DMA Interrupts */
	/*  Enabling/Disabling Tx DMA interrupts */
	if (mask & TX_DMA_INTR) {
		/* Enable TxDMA Intrs in the general intr mask register */
		val64 = TXDMA_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * Keep all interrupts other than PFC interrupt
			 * and PCC interrupt disabled in DMA level.
			 */
			val64 = DISABLE_ALL_INTRS & ~(TXDMA_PFC_INT_M |
						      TXDMA_PCC_INT_M);
			writeq(val64, &bar0->txdma_int_mask);
			/*
			 * Enable only the MISC error 1 interrupt in PFC block
			 */
			val64 = DISABLE_ALL_INTRS & (~PFC_MISC_ERR_1);
			writeq(val64, &bar0->pfc_err_mask);
			/*
			 * Enable only the FB_ECC error interrupt in PCC block
			 */
			val64 = DISABLE_ALL_INTRS & (~PCC_FB_ECC_ERR);
			writeq(val64, &bar0->pcc_err_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable TxDMA Intrs in the general intr mask
			 * register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->txdma_int_mask);
			writeq(DISABLE_ALL_INTRS, &bar0->pfc_err_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  Enabling/Disabling Rx DMA interrupts */
	if (mask & RX_DMA_INTR) {
		/*  Enable RxDMA Intrs in the general intr mask register */
		val64 = RXDMA_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * All RxDMA block interrupts are disabled for now
			 * TODO
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->rxdma_int_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable RxDMA Intrs in the general intr mask
			 * register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->rxdma_int_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  MAC Interrupts */
	/*  Enabling/Disabling MAC interrupts */
	if (mask & (TX_MAC_INTR | RX_MAC_INTR)) {
		val64 = TXMAC_INT_M | RXMAC_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * All MAC block error interrupts are disabled for now
			 * except the link status change interrupt.
			 * TODO
			 */
			val64 = MAC_INT_STATUS_RMAC_INT;
			temp64 = readq(&bar0->mac_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->mac_int_mask);

			val64 = readq(&bar0->mac_rmac_err_mask);
			val64 &= ~((u64) RMAC_LINK_STATE_CHANGE_INT);
			writeq(val64, &bar0->mac_rmac_err_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable MAC Intrs in the general intr mask register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->mac_int_mask);
			writeq(DISABLE_ALL_INTRS,
			       &bar0->mac_rmac_err_mask);

			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  XGXS Interrupts */
	if (mask & (TX_XGXS_INTR | RX_XGXS_INTR)) {
		val64 = TXXGXS_INT_M | RXXGXS_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * All XGXS block error interrupts are disabled for now
			 * TODO
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->xgxs_int_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable MC Intrs in the general intr mask register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->xgxs_int_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  Memory Controller(MC) interrupts */
	if (mask & MC_INTR) {
		val64 = MC_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * Enable all MC Intrs.
			 */
			writeq(0x0, &bar0->mc_int_mask);
			writeq(0x0, &bar0->mc_err_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable MC Intrs in the general intr mask register
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->mc_int_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}


	/*  Tx traffic interrupts */
	if (mask & TX_TRAFFIC_INTR) {
		val64 = TXTRAFFIC_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/*
			 * Enable all the Tx side interrupts
			 * writing 0 Enables all 64 TX interrupt levels
			 */
			writeq(0x0, &bar0->tx_traffic_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable Tx Traffic Intrs in the general intr mask
			 * register.
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->tx_traffic_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}

	/*  Rx traffic interrupts */
	if (mask & RX_TRAFFIC_INTR) {
		val64 = RXTRAFFIC_INT_M;
		if (flag == ENABLE_INTRS) {
			temp64 = readq(&bar0->general_int_mask);
			temp64 &= ~((u64) val64);
			writeq(temp64, &bar0->general_int_mask);
			/* writing 0 Enables all 8 RX interrupt levels */
			writeq(0x0, &bar0->rx_traffic_mask);
		} else if (flag == DISABLE_INTRS) {
			/*
			 * Disable Rx Traffic Intrs in the general intr mask
			 * register.
			 */
			writeq(DISABLE_ALL_INTRS, &bar0->rx_traffic_mask);
			temp64 = readq(&bar0->general_int_mask);
			val64 |= temp64;
			writeq(val64, &bar0->general_int_mask);
		}
	}
}

static int check_prc_pcc_state(u64 val64, int flag, int rev_id)
{
	int ret = 0;

	if (flag == FALSE) {
		if (rev_id >= 4) {
			if (!(val64 & ADAPTER_STATUS_RMAC_PCC_IDLE) &&
			    ((val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ==
			     ADAPTER_STATUS_RC_PRC_QUIESCENT)) {
				ret = 1;
			}
		} else {
			if (!(val64 & ADAPTER_STATUS_RMAC_PCC_FOUR_IDLE) &&
			    ((val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ==
			     ADAPTER_STATUS_RC_PRC_QUIESCENT)) {
				ret = 1;
			}
		}
	} else {
		if (rev_id >= 4) {
			if (((val64 & ADAPTER_STATUS_RMAC_PCC_IDLE) ==
			     ADAPTER_STATUS_RMAC_PCC_IDLE) &&
			    (!(val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ||
			     ((val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ==
			      ADAPTER_STATUS_RC_PRC_QUIESCENT))) {
				ret = 1;
			}
		} else {
			if (((val64 & ADAPTER_STATUS_RMAC_PCC_FOUR_IDLE) ==
			     ADAPTER_STATUS_RMAC_PCC_FOUR_IDLE) &&
			    (!(val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ||
			     ((val64 & ADAPTER_STATUS_RC_PRC_QUIESCENT) ==
			      ADAPTER_STATUS_RC_PRC_QUIESCENT))) {
				ret = 1;
			}
		}
	}

	return ret;
}
/**
 *  verify_xena_quiescence - Checks whether the H/W is ready
 *  @val64 :  Value read from adapter status register.
 *  @flag : indicates if the adapter enable bit was ever written once
 *  before.
 *  Description: Returns whether the H/W is ready to go or not. Depending
 *  on whether adapter enable bit was written or not the comparison
 *  differs and the calling function passes the input argument flag to
 *  indicate this.
 *  Return: 1 If xena is quiescence
 *          0 If Xena is not quiescence
 */

static int verify_xena_quiescence(nic_t *sp, u64 val64, int flag)
{
	int ret = 0;
	u64 tmp64 = ~((u64) val64);
	int rev_id = get_xena_rev_id(sp->pdev);

	if (!
	    (tmp64 &
	     (ADAPTER_STATUS_TDMA_READY | ADAPTER_STATUS_RDMA_READY |
	      ADAPTER_STATUS_PFC_READY | ADAPTER_STATUS_TMAC_BUF_EMPTY |
	      ADAPTER_STATUS_PIC_QUIESCENT | ADAPTER_STATUS_MC_DRAM_READY |
	      ADAPTER_STATUS_MC_QUEUES_READY | ADAPTER_STATUS_M_PLL_LOCK |
	      ADAPTER_STATUS_P_PLL_LOCK))) {
		ret = check_prc_pcc_state(val64, flag, rev_id);
	}

	return ret;
}

/**
 * fix_mac_address -  Fix for Mac addr problem on Alpha platforms
 * @sp: Pointer to device specifc structure
 * Description :
 * New procedure to clear mac address reading  problems on Alpha platforms
 *
 */

void fix_mac_address(nic_t * sp)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64;
	int i = 0;

	while (fix_mac[i] != END_SIGN) {
		writeq(fix_mac[i++], &bar0->gpio_control);
		udelay(10);
		val64 = readq(&bar0->gpio_control);
	}
}

/**
 *  start_nic - Turns the device on
 *  @nic : device private variable.
 *  Description:
 *  This function actually turns the device on. Before this  function is
 *  called,all Registers are configured from their reset states
 *  and shared memory is allocated but the NIC is still quiescent. On
 *  calling this function, the device interrupts are cleared and the NIC is
 *  literally switched on by writing into the adapter control register.
 *  Return Value:
 *  SUCCESS on success and -1 on failure.
 */

static int start_nic(struct s2io_nic *nic)
{
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	struct net_device *dev = nic->dev;
	register u64 val64 = 0;
	u16 interruptible;
	u16 subid, i;
	mac_info_t *mac_control;
	struct config_param *config;

	mac_control = &nic->mac_control;
	config = &nic->config;

	/*  PRC Initialization and configuration */
	for (i = 0; i < config->rx_ring_num; i++) {
		writeq((u64) mac_control->rings[i].rx_blocks[0].block_dma_addr,
		       &bar0->prc_rxd0_n[i]);

		val64 = readq(&bar0->prc_ctrl_n[i]);
#ifndef CONFIG_2BUFF_MODE
		val64 |= PRC_CTRL_RC_ENABLED;
#else
		val64 |= PRC_CTRL_RC_ENABLED | PRC_CTRL_RING_MODE_3;
#endif
		writeq(val64, &bar0->prc_ctrl_n[i]);
	}

#ifdef CONFIG_2BUFF_MODE
	/* Enabling 2 buffer mode by writing into Rx_pa_cfg reg. */
	val64 = readq(&bar0->rx_pa_cfg);
	val64 |= RX_PA_CFG_IGNORE_L2_ERR;
	writeq(val64, &bar0->rx_pa_cfg);
#endif

	/*
	 * Enabling MC-RLDRAM. After enabling the device, we timeout
	 * for around 100ms, which is approximately the time required
	 * for the device to be ready for operation.
	 */
	val64 = readq(&bar0->mc_rldram_mrs);
	val64 |= MC_RLDRAM_QUEUE_SIZE_ENABLE | MC_RLDRAM_MRS_ENABLE;
	SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_mrs, UF);
	val64 = readq(&bar0->mc_rldram_mrs);

	msleep(100);	/* Delay by around 100 ms. */

	/* Enabling ECC Protection. */
	val64 = readq(&bar0->adapter_control);
	val64 &= ~ADAPTER_ECC_EN;
	writeq(val64, &bar0->adapter_control);

	/*
	 * Clearing any possible Link state change interrupts that
	 * could have popped up just before Enabling the card.
	 */
	val64 = readq(&bar0->mac_rmac_err_reg);
	if (val64)
		writeq(val64, &bar0->mac_rmac_err_reg);

	/*
	 * Verify if the device is ready to be enabled, if so enable
	 * it.
	 */
	val64 = readq(&bar0->adapter_status);
	if (!verify_xena_quiescence(nic, val64, nic->device_enabled_once)) {
		DBG_PRINT(ERR_DBG, "%s: device is not ready, ", dev->name);
		DBG_PRINT(ERR_DBG, "Adapter status reads: 0x%llx\n",
			  (unsigned long long) val64);
		return FAILURE;
	}

	/*  Enable select interrupts */
	interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | TX_MAC_INTR |
	    RX_MAC_INTR | MC_INTR;
	en_dis_able_nic_intrs(nic, interruptible, ENABLE_INTRS);

	/*
	 * With some switches, link might be already up at this point.
	 * Because of this weird behavior, when we enable laser,
	 * we may not get link. We need to handle this. We cannot
	 * figure out which switch is misbehaving. So we are forced to
	 * make a global change.
	 */

	/* Enabling Laser. */
	val64 = readq(&bar0->adapter_control);
	val64 |= ADAPTER_EOI_TX_ON;
	writeq(val64, &bar0->adapter_control);

	/* SXE-002: Initialize link and activity LED */
	subid = nic->pdev->subsystem_device;
	if ((subid & 0xFF) >= 0x07) {
		val64 = readq(&bar0->gpio_control);
		val64 |= 0x0000800000000000ULL;
		writeq(val64, &bar0->gpio_control);
		val64 = 0x0411040400000000ULL;
		writeq(val64, (void __iomem *) ((u8 *) bar0 + 0x2700));
	}

	/*
	 * Don't see link state interrupts on certain switches, so
	 * directly scheduling a link state task from here.
	 */
	schedule_work(&nic->set_link_task);

	return SUCCESS;
}

/**
 *  free_tx_buffers - Free all queued Tx buffers
 *  @nic : device private variable.
 *  Description:
 *  Free all queued Tx buffers.
 *  Return Value: void
*/

static void free_tx_buffers(struct s2io_nic *nic)
{
	struct net_device *dev = nic->dev;
	struct sk_buff *skb;
	TxD_t *txdp;
	int i, j;
	mac_info_t *mac_control;
	struct config_param *config;
	int cnt = 0, frg_cnt;

	mac_control = &nic->mac_control;
	config = &nic->config;

	for (i = 0; i < config->tx_fifo_num; i++) {
		for (j = 0; j < config->tx_cfg[i].fifo_len - 1; j++) {
			txdp = (TxD_t *) mac_control->fifos[i].list_info[j].
			    list_virt_addr;
			skb =
			    (struct sk_buff *) ((unsigned long) txdp->
						Host_Control);
			if (skb == NULL) {
				memset(txdp, 0, sizeof(TxD_t) *
				       config->max_txds);
				continue;
			}
			frg_cnt = skb_shinfo(skb)->nr_frags;
			pci_unmap_single(nic->pdev, (dma_addr_t)
					 txdp->Buffer_Pointer,
					 skb->len - skb->data_len,
					 PCI_DMA_TODEVICE);
			if (frg_cnt) {
				TxD_t *temp;
				temp = txdp;
				txdp++;
				for (j = 0; j < frg_cnt; j++, txdp++) {
					skb_frag_t *frag =
					    &skb_shinfo(skb)->frags[j];
					pci_unmap_page(nic->pdev,
						       (dma_addr_t)
						       txdp->
						       Buffer_Pointer,
						       frag->size,
						       PCI_DMA_TODEVICE);
				}
				txdp = temp;
			}
			dev_kfree_skb(skb);
			memset(txdp, 0, sizeof(TxD_t) * config->max_txds);
			cnt++;
		}
		DBG_PRINT(INTR_DBG,
			  "%s:forcibly freeing %d skbs on FIFO%d\n",
			  dev->name, cnt, i);
		mac_control->fifos[i].tx_curr_get_info.offset = 0;
		mac_control->fifos[i].tx_curr_put_info.offset = 0;
	}
}

/**
 *   stop_nic -  To stop the nic
 *   @nic ; device private variable.
 *   Description:
 *   This function does exactly the opposite of what the start_nic()
 *   function does. This function is called to stop the device.
 *   Return Value:
 *   void.
 */

static void stop_nic(struct s2io_nic *nic)
{
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	register u64 val64 = 0;
	u16 interruptible, i;
	mac_info_t *mac_control;
	struct config_param *config;

	mac_control = &nic->mac_control;
	config = &nic->config;

	/*  Disable all interrupts */
	interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR | TX_MAC_INTR |
	    RX_MAC_INTR | MC_INTR;
	en_dis_able_nic_intrs(nic, interruptible, DISABLE_INTRS);

	/*  Disable PRCs */
	for (i = 0; i < config->rx_ring_num; i++) {
		val64 = readq(&bar0->prc_ctrl_n[i]);
		val64 &= ~((u64) PRC_CTRL_RC_ENABLED);
		writeq(val64, &bar0->prc_ctrl_n[i]);
	}
}

/**
 *  fill_rx_buffers - Allocates the Rx side skbs
 *  @nic:  device private variable
 *  @ring_no: ring number
 *  Description:
 *  The function allocates Rx side skbs and puts the physical
 *  address of these buffers into the RxD buffer pointers, so that the NIC
 *  can DMA the received frame into these locations.
 *  The NIC supports 3 receive modes, viz
 *  1. single buffer,
 *  2. three buffer and
 *  3. Five buffer modes.
 *  Each mode defines how many fragments the received frame will be split
 *  up into by the NIC. The frame is split into L3 header, L4 Header,
 *  L4 payload in three buffer mode and in 5 buffer mode, L4 payload itself
 *  is split into 3 fragments. As of now only single buffer mode is
 *  supported.
 *   Return Value:
 *  SUCCESS on success or an appropriate -ve value on failure.
 */

int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
{
	struct net_device *dev = nic->dev;
	struct sk_buff *skb;
	RxD_t *rxdp;
	int off, off1, size, block_no, block_no1;
	int offset, offset1;
	u32 alloc_tab = 0;
	u32 alloc_cnt;
	mac_info_t *mac_control;
	struct config_param *config;
#ifdef CONFIG_2BUFF_MODE
	RxD_t *rxdpnext;
	int nextblk;
	u64 tmp;
	buffAdd_t *ba;
	dma_addr_t rxdpphys;
#endif
#ifndef CONFIG_S2IO_NAPI
	unsigned long flags;
#endif

	mac_control = &nic->mac_control;
	config = &nic->config;
	alloc_cnt = mac_control->rings[ring_no].pkt_cnt -
	    atomic_read(&nic->rx_bufs_left[ring_no]);
	size = dev->mtu + HEADER_ETHERNET_II_802_3_SIZE +
	    HEADER_802_2_SIZE + HEADER_SNAP_SIZE;

	while (alloc_tab < alloc_cnt) {
		block_no = mac_control->rings[ring_no].rx_curr_put_info.
		    block_index;
		block_no1 = mac_control->rings[ring_no].rx_curr_get_info.
		    block_index;
		off = mac_control->rings[ring_no].rx_curr_put_info.offset;
		off1 = mac_control->rings[ring_no].rx_curr_get_info.offset;
#ifndef CONFIG_2BUFF_MODE
		offset = block_no * (MAX_RXDS_PER_BLOCK + 1) + off;
		offset1 = block_no1 * (MAX_RXDS_PER_BLOCK + 1) + off1;
#else
		offset = block_no * (MAX_RXDS_PER_BLOCK) + off;
		offset1 = block_no1 * (MAX_RXDS_PER_BLOCK) + off1;
#endif

		rxdp = mac_control->rings[ring_no].rx_blocks[block_no].
		    block_virt_addr + off;
		if ((offset == offset1) && (rxdp->Host_Control)) {
			DBG_PRINT(INTR_DBG, "%s: Get and Put", dev->name);
			DBG_PRINT(INTR_DBG, " info equated\n");
			goto end;
		}
#ifndef	CONFIG_2BUFF_MODE
		if (rxdp->Control_1 == END_OF_BLOCK) {
			mac_control->rings[ring_no].rx_curr_put_info.
			    block_index++;
			mac_control->rings[ring_no].rx_curr_put_info.
			    block_index %= mac_control->rings[ring_no].block_count;
			block_no = mac_control->rings[ring_no].rx_curr_put_info.
				block_index;
			off++;
			off %= (MAX_RXDS_PER_BLOCK + 1);
			mac_control->rings[ring_no].rx_curr_put_info.offset =
			    off;
			rxdp = (RxD_t *) ((unsigned long) rxdp->Control_2);
			DBG_PRINT(INTR_DBG, "%s: Next block at: %p\n",
				  dev->name, rxdp);
		}
#ifndef CONFIG_S2IO_NAPI
		spin_lock_irqsave(&nic->put_lock, flags);
		mac_control->rings[ring_no].put_pos =
		    (block_no * (MAX_RXDS_PER_BLOCK + 1)) + off;
		spin_unlock_irqrestore(&nic->put_lock, flags);
#endif
#else
		if (rxdp->Host_Control == END_OF_BLOCK) {
			mac_control->rings[ring_no].rx_curr_put_info.
			    block_index++;
			mac_control->rings[ring_no].rx_curr_put_info.block_index
			    %= mac_control->rings[ring_no].block_count;
			block_no = mac_control->rings[ring_no].rx_curr_put_info
			    .block_index;
			off = 0;
			DBG_PRINT(INTR_DBG, "%s: block%d at: 0x%llx\n",
				  dev->name, block_no,
				  (unsigned long long) rxdp->Control_1);
			mac_control->rings[ring_no].rx_curr_put_info.offset =
			    off;
			rxdp = mac_control->rings[ring_no].rx_blocks[block_no].
			    block_virt_addr;
		}
#ifndef CONFIG_S2IO_NAPI
		spin_lock_irqsave(&nic->put_lock, flags);
		mac_control->rings[ring_no].put_pos = (block_no *
					 (MAX_RXDS_PER_BLOCK + 1)) + off;
		spin_unlock_irqrestore(&nic->put_lock, flags);
#endif
#endif

#ifndef	CONFIG_2BUFF_MODE
		if (rxdp->Control_1 & RXD_OWN_XENA)
#else
		if (rxdp->Control_2 & BIT(0))
#endif
		{
			mac_control->rings[ring_no].rx_curr_put_info.
			    offset = off;
			goto end;
		}
#ifdef	CONFIG_2BUFF_MODE
		/*
		 * RxDs Spanning cache lines will be replenished only
		 * if the succeeding RxD is also owned by Host. It
		 * will always be the ((8*i)+3) and ((8*i)+6)
		 * descriptors for the 48 byte descriptor. The offending
		 * decsriptor is of-course the 3rd descriptor.
		 */
		rxdpphys = mac_control->rings[ring_no].rx_blocks[block_no].
		    block_dma_addr + (off * sizeof(RxD_t));
		if (((u64) (rxdpphys)) % 128 > 80) {
			rxdpnext = mac_control->rings[ring_no].rx_blocks[block_no].
			    block_virt_addr + (off + 1);
			if (rxdpnext->Host_Control == END_OF_BLOCK) {
				nextblk = (block_no + 1) %
				    (mac_control->rings[ring_no].block_count);
				rxdpnext = mac_control->rings[ring_no].rx_blocks
				    [nextblk].block_virt_addr;
			}
			if (rxdpnext->Control_2 & BIT(0))
				goto end;
		}
#endif

#ifndef	CONFIG_2BUFF_MODE
		skb = dev_alloc_skb(size + NET_IP_ALIGN);
#else
		skb = dev_alloc_skb(dev->mtu + ALIGN_SIZE + BUF0_LEN + 4);
#endif
		if (!skb) {
			DBG_PRINT(ERR_DBG, "%s: Out of ", dev->name);
			DBG_PRINT(ERR_DBG, "memory to allocate SKBs\n");
			return -ENOMEM;
		}
#ifndef	CONFIG_2BUFF_MODE
		skb_reserve(skb, NET_IP_ALIGN);
		memset(rxdp, 0, sizeof(RxD_t));
		rxdp->Buffer0_ptr = pci_map_single
		    (nic->pdev, skb->data, size, PCI_DMA_FROMDEVICE);
		rxdp->Control_2 &= (~MASK_BUFFER0_SIZE);
		rxdp->Control_2 |= SET_BUFFER0_SIZE(size);
		rxdp->Host_Control = (unsigned long) (skb);
		rxdp->Control_1 |= RXD_OWN_XENA;
		off++;
		off %= (MAX_RXDS_PER_BLOCK + 1);
		mac_control->rings[ring_no].rx_curr_put_info.offset = off;
#else
		ba = &mac_control->rings[ring_no].ba[block_no][off];
		skb_reserve(skb, BUF0_LEN);
		tmp = ((unsigned long) skb->data & ALIGN_SIZE);
		if (tmp)
			skb_reserve(skb, (ALIGN_SIZE + 1) - tmp);

		memset(rxdp, 0, sizeof(RxD_t));
		rxdp->Buffer2_ptr = pci_map_single
		    (nic->pdev, skb->data, dev->mtu + BUF0_LEN + 4,
		     PCI_DMA_FROMDEVICE);
		rxdp->Buffer0_ptr =
		    pci_map_single(nic->pdev, ba->ba_0, BUF0_LEN,
				   PCI_DMA_FROMDEVICE);
		rxdp->Buffer1_ptr =
		    pci_map_single(nic->pdev, ba->ba_1, BUF1_LEN,
				   PCI_DMA_FROMDEVICE);

		rxdp->Control_2 = SET_BUFFER2_SIZE(dev->mtu + 4);
		rxdp->Control_2 |= SET_BUFFER0_SIZE(BUF0_LEN);
		rxdp->Control_2 |= SET_BUFFER1_SIZE(1);	/* dummy. */
		rxdp->Control_2 |= BIT(0);	/* Set Buffer_Empty bit. */
		rxdp->Host_Control = (u64) ((unsigned long) (skb));
		rxdp->Control_1 |= RXD_OWN_XENA;
		off++;
		mac_control->rings[ring_no].rx_curr_put_info.offset = off;
#endif
		rxdp->Control_2 |= SET_RXD_MARKER;

		atomic_inc(&nic->rx_bufs_left[ring_no]);
		alloc_tab++;
	}

      end:
	return SUCCESS;
}

/**
 *  free_rx_buffers - Frees all Rx buffers
 *  @sp: device private variable.
 *  Description:
 *  This function will free all Rx buffers allocated by host.
 *  Return Value:
 *  NONE.
 */

static void free_rx_buffers(struct s2io_nic *sp)
{
	struct net_device *dev = sp->dev;
	int i, j, blk = 0, off, buf_cnt = 0;
	RxD_t *rxdp;
	struct sk_buff *skb;
	mac_info_t *mac_control;
	struct config_param *config;
#ifdef CONFIG_2BUFF_MODE
	buffAdd_t *ba;
#endif

	mac_control = &sp->mac_control;
	config = &sp->config;

	for (i = 0; i < config->rx_ring_num; i++) {
		for (j = 0, blk = 0; j < config->rx_cfg[i].num_rxd; j++) {
			off = j % (MAX_RXDS_PER_BLOCK + 1);
			rxdp = mac_control->rings[i].rx_blocks[blk].
				block_virt_addr + off;

#ifndef CONFIG_2BUFF_MODE
			if (rxdp->Control_1 == END_OF_BLOCK) {
				rxdp =
				    (RxD_t *) ((unsigned long) rxdp->
					       Control_2);
				j++;
				blk++;
			}
#else
			if (rxdp->Host_Control == END_OF_BLOCK) {
				blk++;
				continue;
			}
#endif

			if (!(rxdp->Control_1 & RXD_OWN_XENA)) {
				memset(rxdp, 0, sizeof(RxD_t));
				continue;
			}

			skb =
			    (struct sk_buff *) ((unsigned long) rxdp->
						Host_Control);
			if (skb) {
#ifndef CONFIG_2BUFF_MODE
				pci_unmap_single(sp->pdev, (dma_addr_t)
						 rxdp->Buffer0_ptr,
						 dev->mtu +
						 HEADER_ETHERNET_II_802_3_SIZE
						 + HEADER_802_2_SIZE +
						 HEADER_SNAP_SIZE,
						 PCI_DMA_FROMDEVICE);
#else
				ba = &mac_control->rings[i].ba[blk][off];
				pci_unmap_single(sp->pdev, (dma_addr_t)
						 rxdp->Buffer0_ptr,
						 BUF0_LEN,
						 PCI_DMA_FROMDEVICE);
				pci_unmap_single(sp->pdev, (dma_addr_t)
						 rxdp->Buffer1_ptr,
						 BUF1_LEN,
						 PCI_DMA_FROMDEVICE);
				pci_unmap_single(sp->pdev, (dma_addr_t)
						 rxdp->Buffer2_ptr,
						 dev->mtu + BUF0_LEN + 4,
						 PCI_DMA_FROMDEVICE);
#endif
				dev_kfree_skb(skb);
				atomic_dec(&sp->rx_bufs_left[i]);
				buf_cnt++;
			}
			memset(rxdp, 0, sizeof(RxD_t));
		}
		mac_control->rings[i].rx_curr_put_info.block_index = 0;
		mac_control->rings[i].rx_curr_get_info.block_index = 0;
		mac_control->rings[i].rx_curr_put_info.offset = 0;
		mac_control->rings[i].rx_curr_get_info.offset = 0;
		atomic_set(&sp->rx_bufs_left[i], 0);
		DBG_PRINT(INIT_DBG, "%s:Freed 0x%x Rx Buffers on ring%d\n",
			  dev->name, buf_cnt, i);
	}
}

/**
 * s2io_poll - Rx interrupt handler for NAPI support
 * @dev : pointer to the device structure.
 * @budget : The number of packets that were budgeted to be processed
 * during  one pass through the 'Poll" function.
 * Description:
 * Comes into picture only if NAPI support has been incorporated. It does
 * the same thing that rx_intr_handler does, but not in a interrupt context
 * also It will process only a given number of packets.
 * Return value:
 * 0 on success and 1 if there are No Rx packets to be processed.
 */

#if defined(CONFIG_S2IO_NAPI)
static int s2io_poll(struct net_device *dev, int *budget)
{
	nic_t *nic = dev->priv;
	int pkt_cnt = 0, org_pkts_to_process;
	mac_info_t *mac_control;
	struct config_param *config;
	XENA_dev_config_t *bar0 = (XENA_dev_config_t *) nic->bar0;
	u64 val64;
	int i;

	atomic_inc(&nic->isr_cnt);
	mac_control = &nic->mac_control;
	config = &nic->config;

	nic->pkts_to_process = *budget;
	if (nic->pkts_to_process > dev->quota)
		nic->pkts_to_process = dev->quota;
	org_pkts_to_process = nic->pkts_to_process;

	val64 = readq(&bar0->rx_traffic_int);
	writeq(val64, &bar0->rx_traffic_int);

	for (i = 0; i < config->rx_ring_num; i++) {
		rx_intr_handler(&mac_control->rings[i]);
		pkt_cnt = org_pkts_to_process - nic->pkts_to_process;
		if (!nic->pkts_to_process) {
			/* Quota for the current iteration has been met */
			goto no_rx;
		}
	}
	if (!pkt_cnt)
		pkt_cnt = 1;

	dev->quota -= pkt_cnt;
	*budget -= pkt_cnt;
	netif_rx_complete(dev);

	for (i = 0; i < config->rx_ring_num; i++) {
		if (fill_rx_buffers(nic, i) == -ENOMEM) {
			DBG_PRINT(ERR_DBG, "%s:Out of memory", dev->name);
			DBG_PRINT(ERR_DBG, " in Rx Poll!!\n");
			break;
		}
	}
	/* Re enable the Rx interrupts. */
	en_dis_able_nic_intrs(nic, RX_TRAFFIC_INTR, ENABLE_INTRS);
	atomic_dec(&nic->isr_cnt);
	return 0;

no_rx:
	dev->quota -= pkt_cnt;
	*budget -= pkt_cnt;

	for (i = 0; i < config->rx_ring_num; i++) {
		if (fill_rx_buffers(nic, i) == -ENOMEM) {
			DBG_PRINT(ERR_DBG, "%s:Out of memory", dev->name);
			DBG_PRINT(ERR_DBG, " in Rx Poll!!\n");
			break;
		}
	}
	atomic_dec(&nic->isr_cnt);
	return 1;
}
#endif

/**
 *  rx_intr_handler - Rx interrupt handler
 *  @nic: device private variable.
 *  Description:
 *  If the interrupt is because of a received frame or if the
 *  receive ring contains fresh as yet un-processed frames,this function is
 *  called. It picks out the RxD at which place the last Rx processing had
 *  stopped and sends the skb to the OSM's Rx handler and then increments
 *  the offset.
 *  Return Value:
 *  NONE.
 */
static void rx_intr_handler(ring_info_t *ring_data)
{
	nic_t *nic = ring_data->nic;
	struct net_device *dev = (struct net_device *) nic->dev;
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	int get_block, get_offset, put_block, put_offset, ring_bufs;
	rx_curr_get_info_t get_info, put_info;
	RxD_t *rxdp;
	struct sk_buff *skb;
#ifndef CONFIG_S2IO_NAPI
	int pkt_cnt = 0;
#endif
	register u64 val64;

	spin_lock(&nic->rx_lock);
	if (atomic_read(&nic->card_state) == CARD_DOWN) {
		DBG_PRINT(ERR_DBG, "%s: %s going down for reset\n",
			  __FUNCTION__, dev->name);
		spin_unlock(&nic->rx_lock);
	}

	/*
	 * rx_traffic_int reg is an R1 register, hence we read and write
	 * back the same value in the register to clear it
	 */
	val64 = readq(&bar0->tx_traffic_int);
	writeq(val64, &bar0->tx_traffic_int);

	get_info = ring_data->rx_curr_get_info;
	get_block = get_info.block_index;
	put_info = ring_data->rx_curr_put_info;
	put_block = put_info.block_index;
	ring_bufs = get_info.ring_len+1;
	rxdp = ring_data->rx_blocks[get_block].block_virt_addr +
		    get_info.offset;
	get_offset = (get_block * (MAX_RXDS_PER_BLOCK + 1)) +
		get_info.offset;
#ifndef CONFIG_S2IO_NAPI
	spin_lock(&nic->put_lock);
	put_offset = ring_data->put_pos;
	spin_unlock(&nic->put_lock);
#else
	put_offset = (put_block * (MAX_RXDS_PER_BLOCK + 1)) +
		put_info.offset;
#endif
	while (RXD_IS_UP2DT(rxdp) &&
	       (((get_offset + 1) % ring_bufs) != put_offset)) {
		skb = (struct sk_buff *) ((unsigned long)rxdp->Host_Control);
		if (skb == NULL) {
			DBG_PRINT(ERR_DBG, "%s: The skb is ",
				  dev->name);
			DBG_PRINT(ERR_DBG, "Null in Rx Intr\n");
			spin_unlock(&nic->rx_lock);
			return;
		}
#ifndef CONFIG_2BUFF_MODE
		pci_unmap_single(nic->pdev, (dma_addr_t)
				 rxdp->Buffer0_ptr,
				 dev->mtu +
				 HEADER_ETHERNET_II_802_3_SIZE +
				 HEADER_802_2_SIZE +
				 HEADER_SNAP_SIZE,
				 PCI_DMA_FROMDEVICE);
#else
		pci_unmap_single(nic->pdev, (dma_addr_t)
				 rxdp->Buffer0_ptr,
				 BUF0_LEN, PCI_DMA_FROMDEVICE);
		pci_unmap_single(nic->pdev, (dma_addr_t)
				 rxdp->Buffer1_ptr,
				 BUF1_LEN, PCI_DMA_FROMDEVICE);
		pci_unmap_single(nic->pdev, (dma_addr_t)
				 rxdp->Buffer2_ptr,
				 dev->mtu + BUF0_LEN + 4,
				 PCI_DMA_FROMDEVICE);
#endif
		rx_osm_handler(ring_data, rxdp);
		get_info.offset++;
		ring_data->rx_curr_get_info.offset =
		    get_info.offset;
		rxdp = ring_data->rx_blocks[get_block].block_virt_addr +
		    get_info.offset;
		if (get_info.offset &&
		    (!(get_info.offset % MAX_RXDS_PER_BLOCK))) {
			get_info.offset = 0;
			ring_data->rx_curr_get_info.offset
			    = get_info.offset;
			get_block++;
			get_block %= ring_data->block_count;
			ring_data->rx_curr_get_info.block_index
			    = get_block;
			rxdp = ring_data->rx_blocks[get_block].block_virt_addr;
		}

		get_offset = (get_block * (MAX_RXDS_PER_BLOCK + 1)) +
			    get_info.offset;
#ifdef CONFIG_S2IO_NAPI
		nic->pkts_to_process -= 1;
		if (!nic->pkts_to_process)
			break;
#else
		pkt_cnt++;
		if ((indicate_max_pkts) && (pkt_cnt > indicate_max_pkts))
			break;
#endif
	}
	spin_unlock(&nic->rx_lock);
}

/**
 *  tx_intr_handler - Transmit interrupt handler
 *  @nic : device private variable
 *  Description:
 *  If an interrupt was raised to indicate DMA complete of the
 *  Tx packet, this function is called. It identifies the last TxD
 *  whose buffer was freed and frees all skbs whose data have already
 *  DMA'ed into the NICs internal memory.
 *  Return Value:
 *  NONE
 */

static void tx_intr_handler(fifo_info_t *fifo_data)
{
	nic_t *nic = fifo_data->nic;
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	struct net_device *dev = (struct net_device *) nic->dev;
	tx_curr_get_info_t get_info, put_info;
	struct sk_buff *skb;
	TxD_t *txdlp;
	u16 j, frg_cnt;
	register u64 val64 = 0;

	/*
	 * tx_traffic_int reg is an R1 register, hence we read and write
	 * back the same value in the register to clear it
	 */
	val64 = readq(&bar0->tx_traffic_int);
	writeq(val64, &bar0->tx_traffic_int);

	get_info = fifo_data->tx_curr_get_info;
	put_info = fifo_data->tx_curr_put_info;
	txdlp = (TxD_t *) fifo_data->list_info[get_info.offset].
	    list_virt_addr;
	while ((!(txdlp->Control_1 & TXD_LIST_OWN_XENA)) &&
	       (get_info.offset != put_info.offset) &&
	       (txdlp->Host_Control)) {
		/* Check for TxD errors */
		if (txdlp->Control_1 & TXD_T_CODE) {
			unsigned long long err;
			err = txdlp->Control_1 & TXD_T_CODE;
			DBG_PRINT(ERR_DBG, "***TxD error %llx\n",
				  err);
		}

		skb = (struct sk_buff *) ((unsigned long)
				txdlp->Host_Control);
		if (skb == NULL) {
			DBG_PRINT(ERR_DBG, "%s: Null skb ",
			__FUNCTION__);
			DBG_PRINT(ERR_DBG, "in Tx Free Intr\n");
			return;
		}

		frg_cnt = skb_shinfo(skb)->nr_frags;
		nic->tx_pkt_count++;

		pci_unmap_single(nic->pdev, (dma_addr_t)
				 txdlp->Buffer_Pointer,
				 skb->len - skb->data_len,
				 PCI_DMA_TODEVICE);
		if (frg_cnt) {
			TxD_t *temp;
			temp = txdlp;
			txdlp++;
			for (j = 0; j < frg_cnt; j++, txdlp++) {
				skb_frag_t *frag =
				    &skb_shinfo(skb)->frags[j];
				pci_unmap_page(nic->pdev,
					       (dma_addr_t)
					       txdlp->
					       Buffer_Pointer,
					       frag->size,
					       PCI_DMA_TODEVICE);
			}
			txdlp = temp;
		}
		memset(txdlp, 0,
		       (sizeof(TxD_t) * fifo_data->max_txds));

		/* Updating the statistics block */
		nic->stats.tx_bytes += skb->len;
		dev_kfree_skb_irq(skb);

		get_info.offset++;
		get_info.offset %= get_info.fifo_len + 1;
		txdlp = (TxD_t *) fifo_data->list_info
		    [get_info.offset].list_virt_addr;
		fifo_data->tx_curr_get_info.offset =
		    get_info.offset;
	}

	spin_lock(&nic->tx_lock);
	if (netif_queue_stopped(dev))
		netif_wake_queue(dev);
	spin_unlock(&nic->tx_lock);
}

/**
 *  alarm_intr_handler - Alarm Interrrupt handler
 *  @nic: device private variable
 *  Description: If the interrupt was neither because of Rx packet or Tx
 *  complete, this function is called. If the interrupt was to indicate
 *  a loss of link, the OSM link status handler is invoked for any other
 *  alarm interrupt the block that raised the interrupt is displayed
 *  and a H/W reset is issued.
 *  Return Value:
 *  NONE
*/

static void alarm_intr_handler(struct s2io_nic *nic)
{
	struct net_device *dev = (struct net_device *) nic->dev;
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	register u64 val64 = 0, err_reg = 0;

	/* Handling link status change error Intr */
	err_reg = readq(&bar0->mac_rmac_err_reg);
	writeq(err_reg, &bar0->mac_rmac_err_reg);
	if (err_reg & RMAC_LINK_STATE_CHANGE_INT) {
		schedule_work(&nic->set_link_task);
	}

	/* Handling Ecc errors */
	val64 = readq(&bar0->mc_err_reg);
	writeq(val64, &bar0->mc_err_reg);
	if (val64 & (MC_ERR_REG_ECC_ALL_SNG | MC_ERR_REG_ECC_ALL_DBL)) {
		if (val64 & MC_ERR_REG_ECC_ALL_DBL) {
			nic->mac_control.stats_info->sw_stat.
				double_ecc_errs++;
			DBG_PRINT(ERR_DBG, "%s: Device indicates ",
				  dev->name);
			DBG_PRINT(ERR_DBG, "double ECC error!!\n");
			netif_stop_queue(dev);
			schedule_work(&nic->rst_timer_task);
		} else {
			nic->mac_control.stats_info->sw_stat.
				single_ecc_errs++;
		}
	}

	/* In case of a serious error, the device will be Reset. */
	val64 = readq(&bar0->serr_source);
	if (val64 & SERR_SOURCE_ANY) {
		DBG_PRINT(ERR_DBG, "%s: Device indicates ", dev->name);
		DBG_PRINT(ERR_DBG, "serious error!!\n");
		netif_stop_queue(dev);
		schedule_work(&nic->rst_timer_task);
	}

	/*
	 * Also as mentioned in the latest Errata sheets if the PCC_FB_ECC
	 * Error occurs, the adapter will be recycled by disabling the
	 * adapter enable bit and enabling it again after the device
	 * becomes Quiescent.
	 */
	val64 = readq(&bar0->pcc_err_reg);
	writeq(val64, &bar0->pcc_err_reg);
	if (val64 & PCC_FB_ECC_DB_ERR) {
		u64 ac = readq(&bar0->adapter_control);
		ac &= ~(ADAPTER_CNTL_EN);
		writeq(ac, &bar0->adapter_control);
		ac = readq(&bar0->adapter_control);
		schedule_work(&nic->set_link_task);
	}

	/* Other type of interrupts are not being handled now,  TODO */
}

/**
 *  wait_for_cmd_complete - waits for a command to complete.
 *  @sp : private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  Description: Function that waits for a command to Write into RMAC
 *  ADDR DATA registers to be completed and returns either success or
 *  error depending on whether the command was complete or not.
 *  Return value:
 *   SUCCESS on success and FAILURE on failure.
 */

int wait_for_cmd_complete(nic_t * sp)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	int ret = FAILURE, cnt = 0;
	u64 val64;

	while (TRUE) {
		val64 = readq(&bar0->rmac_addr_cmd_mem);
		if (!(val64 & RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING)) {
			ret = SUCCESS;
			break;
		}
		msleep(50);
		if (cnt++ > 10)
			break;
	}

	return ret;
}

/**
 *  s2io_reset - Resets the card.
 *  @sp : private member of the device structure.
 *  Description: Function to Reset the card. This function then also
 *  restores the previously saved PCI configuration space registers as
 *  the card reset also resets the configuration space.
 *  Return value:
 *  void.
 */

void s2io_reset(nic_t * sp)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64;
	u16 subid, pci_cmd;

	val64 = SW_RESET_ALL;
	writeq(val64, &bar0->sw_reset);

	/*
	 * At this stage, if the PCI write is indeed completed, the
	 * card is reset and so is the PCI Config space of the device.
	 * So a read cannot be issued at this stage on any of the
	 * registers to ensure the write into "sw_reset" register
	 * has gone through.
	 * Question: Is there any system call that will explicitly force
	 * all the write commands still pending on the bus to be pushed
	 * through?
	 * As of now I'am just giving a 250ms delay and hoping that the
	 * PCI write to sw_reset register is done by this time.
	 */
	msleep(250);

	/* Restore the PCI state saved during initializarion. */
	pci_restore_state(sp->pdev);

	s2io_init_pci(sp);

	msleep(250);

	/* Set swapper to enable I/O register access */
	s2io_set_swapper(sp);

	/* Clear certain PCI/PCI-X fields after reset */
	pci_read_config_word(sp->pdev, PCI_COMMAND, &pci_cmd);
	pci_cmd &= 0x7FFF; /* Clear parity err detect bit */
	pci_write_config_word(sp->pdev, PCI_COMMAND, pci_cmd);

	val64 = readq(&bar0->txpic_int_reg);
	val64 &= ~BIT(62); /* Clearing PCI_STATUS error reflected here */
	writeq(val64, &bar0->txpic_int_reg);

	/* Clearing PCIX Ecc status register */
	pci_write_config_dword(sp->pdev, 0x68, 0);

	/* Reset device statistics maintained by OS */
	memset(&sp->stats, 0, sizeof (struct net_device_stats));

	/* SXE-002: Configure link and activity LED to turn it off */
	subid = sp->pdev->subsystem_device;
	if ((subid & 0xFF) >= 0x07) {
		val64 = readq(&bar0->gpio_control);
		val64 |= 0x0000800000000000ULL;
		writeq(val64, &bar0->gpio_control);
		val64 = 0x0411040400000000ULL;
		writeq(val64, (void __iomem *) ((u8 *) bar0 + 0x2700));
	}

	sp->device_enabled_once = FALSE;
}

/**
 *  s2io_set_swapper - to set the swapper controle on the card
 *  @sp : private member of the device structure,
 *  pointer to the s2io_nic structure.
 *  Description: Function to set the swapper control on the card
 *  correctly depending on the 'endianness' of the system.
 *  Return value:
 *  SUCCESS on success and FAILURE on failure.
 */

int s2io_set_swapper(nic_t * sp)
{
	struct net_device *dev = sp->dev;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64, valt, valr;

	/*
	 * Set proper endian settings and verify the same by reading
	 * the PIF Feed-back register.
	 */

	val64 = readq(&bar0->pif_rd_swapper_fb);
	if (val64 != 0x0123456789ABCDEFULL) {
		int i = 0;
		u64 value[] = { 0xC30000C3C30000C3ULL,   /* FE=1, SE=1 */
				0x8100008181000081ULL,  /* FE=1, SE=0 */
				0x4200004242000042ULL,  /* FE=0, SE=1 */
				0};                     /* FE=0, SE=0 */

		while(i<4) {
			writeq(value[i], &bar0->swapper_ctrl);
			val64 = readq(&bar0->pif_rd_swapper_fb);
			if (val64 == 0x0123456789ABCDEFULL)
				break;
			i++;
		}
		if (i == 4) {
			DBG_PRINT(ERR_DBG, "%s: Endian settings are wrong, ",
				dev->name);
			DBG_PRINT(ERR_DBG, "feedback read %llx\n",
				(unsigned long long) val64);
			return FAILURE;
		}
		valr = value[i];
	} else {
		valr = readq(&bar0->swapper_ctrl);
	}

	valt = 0x0123456789ABCDEFULL;
	writeq(valt, &bar0->xmsi_address);
	val64 = readq(&bar0->xmsi_address);

	if(val64 != valt) {
		int i = 0;
		u64 value[] = { 0x00C3C30000C3C300ULL,  /* FE=1, SE=1 */
				0x0081810000818100ULL,  /* FE=1, SE=0 */
				0x0042420000424200ULL,  /* FE=0, SE=1 */
				0};                     /* FE=0, SE=0 */

		while(i<4) {
			writeq((value[i] | valr), &bar0->swapper_ctrl);
			writeq(valt, &bar0->xmsi_address);
			val64 = readq(&bar0->xmsi_address);
			if(val64 == valt)
				break;
			i++;
		}
		if(i == 4) {
			unsigned long long x = val64;
			DBG_PRINT(ERR_DBG, "Write failed, Xmsi_addr ");
			DBG_PRINT(ERR_DBG, "reads:0x%llx\n", x);
			return FAILURE;
		}
	}
	val64 = readq(&bar0->swapper_ctrl);
	val64 &= 0xFFFF000000000000ULL;

#ifdef  __BIG_ENDIAN
	/*
	 * The device by default set to a big endian format, so a
	 * big endian driver need not set anything.
	 */
	val64 |= (SWAPPER_CTRL_TXP_FE |
		 SWAPPER_CTRL_TXP_SE |
		 SWAPPER_CTRL_TXD_R_FE |
		 SWAPPER_CTRL_TXD_W_FE |
		 SWAPPER_CTRL_TXF_R_FE |
		 SWAPPER_CTRL_RXD_R_FE |
		 SWAPPER_CTRL_RXD_W_FE |
		 SWAPPER_CTRL_RXF_W_FE |
		 SWAPPER_CTRL_XMSI_FE |
		 SWAPPER_CTRL_XMSI_SE |
		 SWAPPER_CTRL_STATS_FE | SWAPPER_CTRL_STATS_SE);
	writeq(val64, &bar0->swapper_ctrl);
#else
	/*
	 * Initially we enable all bits to make it accessible by the
	 * driver, then we selectively enable only those bits that
	 * we want to set.
	 */
	val64 |= (SWAPPER_CTRL_TXP_FE |
		 SWAPPER_CTRL_TXP_SE |
		 SWAPPER_CTRL_TXD_R_FE |
		 SWAPPER_CTRL_TXD_R_SE |
		 SWAPPER_CTRL_TXD_W_FE |
		 SWAPPER_CTRL_TXD_W_SE |
		 SWAPPER_CTRL_TXF_R_FE |
		 SWAPPER_CTRL_RXD_R_FE |
		 SWAPPER_CTRL_RXD_R_SE |
		 SWAPPER_CTRL_RXD_W_FE |
		 SWAPPER_CTRL_RXD_W_SE |
		 SWAPPER_CTRL_RXF_W_FE |
		 SWAPPER_CTRL_XMSI_FE |
		 SWAPPER_CTRL_XMSI_SE |
		 SWAPPER_CTRL_STATS_FE | SWAPPER_CTRL_STATS_SE);
	writeq(val64, &bar0->swapper_ctrl);
#endif
	val64 = readq(&bar0->swapper_ctrl);

	/*
	 * Verifying if endian settings are accurate by reading a
	 * feedback register.
	 */
	val64 = readq(&bar0->pif_rd_swapper_fb);
	if (val64 != 0x0123456789ABCDEFULL) {
		/* Endian settings are incorrect, calls for another dekko. */
		DBG_PRINT(ERR_DBG, "%s: Endian settings are wrong, ",
			  dev->name);
		DBG_PRINT(ERR_DBG, "feedback read %llx\n",
			  (unsigned long long) val64);
		return FAILURE;
	}

	return SUCCESS;
}

/* ********************************************************* *
 * Functions defined below concern the OS part of the driver *
 * ********************************************************* */

/**
 *  s2io_open - open entry point of the driver
 *  @dev : pointer to the device structure.
 *  Description:
 *  This function is the open entry point of the driver. It mainly calls a
 *  function to allocate Rx buffers and inserts them into the buffer
 *  descriptors and then enables the Rx part of the NIC.
 *  Return value:
 *  0 on success and an appropriate (-)ve integer as defined in errno.h
 *   file on failure.
 */

int s2io_open(struct net_device *dev)
{
	nic_t *sp = dev->priv;
	int err = 0;

	/*
	 * Make sure you have link off by default every time
	 * Nic is initialized
	 */
	netif_carrier_off(dev);
	sp->last_link_state = 0; /* Unkown link state */

	/* Initialize H/W and enable interrupts */
	if (s2io_card_up(sp)) {
		DBG_PRINT(ERR_DBG, "%s: H/W initialization failed\n",
			  dev->name);
		err = -ENODEV;
		goto hw_init_failed;
	}

	/* After proper initialization of H/W, register ISR */
	err = request_irq((int) sp->pdev->irq, s2io_isr, SA_SHIRQ,
			  sp->name, dev);
	if (err) {
		DBG_PRINT(ERR_DBG, "%s: ISR registration failed\n",
			  dev->name);
		goto isr_registration_failed;
	}

	if (s2io_set_mac_addr(dev, dev->dev_addr) == FAILURE) {
		DBG_PRINT(ERR_DBG, "Set Mac Address Failed\n");
		err = -ENODEV;
		goto setting_mac_address_failed;
	}

	netif_start_queue(dev);
	return 0;

setting_mac_address_failed:
	free_irq(sp->pdev->irq, dev);
isr_registration_failed:
	s2io_reset(sp);
hw_init_failed:
	return err;
}

/**
 *  s2io_close -close entry point of the driver
 *  @dev : device pointer.
 *  Description:
 *  This is the stop entry point of the driver. It needs to undo exactly
 *  whatever was done by the open entry point,thus it's usually referred to
 *  as the close function.Among other things this function mainly stops the
 *  Rx side of the NIC and frees all the Rx buffers in the Rx rings.
 *  Return value:
 *  0 on success and an appropriate (-)ve integer as defined in errno.h
 *  file on failure.
 */

int s2io_close(struct net_device *dev)
{
	nic_t *sp = dev->priv;
	flush_scheduled_work();
	netif_stop_queue(dev);
	/* Reset card, kill tasklet and free Tx and Rx buffers. */
	s2io_card_down(sp);

	free_irq(sp->pdev->irq, dev);
	sp->device_close_flag = TRUE;	/* Device is shut down. */
	return 0;
}

/**
 *  s2io_xmit - Tx entry point of te driver
 *  @skb : the socket buffer containing the Tx data.
 *  @dev : device pointer.
 *  Description :
 *  This function is the Tx entry point of the driver. S2IO NIC supports
 *  certain protocol assist features on Tx side, namely  CSO, S/G, LSO.
 *  NOTE: when device cant queue the pkt,just the trans_start variable will
 *  not be upadted.
 *  Return value:
 *  0 on success & 1 on failure.
 */

int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
{
	nic_t *sp = dev->priv;
	u16 frg_cnt, frg_len, i, queue, queue_len, put_off, get_off;
	register u64 val64;
	TxD_t *txdp;
	TxFIFO_element_t __iomem *tx_fifo;
	unsigned long flags;
#ifdef NETIF_F_TSO
	int mss;
#endif
	mac_info_t *mac_control;
	struct config_param *config;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;

	mac_control = &sp->mac_control;
	config = &sp->config;

	DBG_PRINT(TX_DBG, "%s: In Neterion Tx routine\n", dev->name);
	spin_lock_irqsave(&sp->tx_lock, flags);
	if (atomic_read(&sp->card_state) == CARD_DOWN) {
		DBG_PRINT(TX_DBG, "%s: Card going down for reset\n",
			  dev->name);
		spin_unlock_irqrestore(&sp->tx_lock, flags);
		dev_kfree_skb(skb);
		return 0;
	}

	queue = 0;

	put_off = (u16) mac_control->fifos[queue].tx_curr_put_info.offset;
	get_off = (u16) mac_control->fifos[queue].tx_curr_get_info.offset;
	txdp = (TxD_t *) mac_control->fifos[queue].list_info[put_off].
		list_virt_addr;

	queue_len = mac_control->fifos[queue].tx_curr_put_info.fifo_len + 1;
	/* Avoid "put" pointer going beyond "get" pointer */
	if (txdp->Host_Control || (((put_off + 1) % queue_len) == get_off)) {
		DBG_PRINT(ERR_DBG, "Error in xmit, No free TXDs.\n");
		netif_stop_queue(dev);
		dev_kfree_skb(skb);
		spin_unlock_irqrestore(&sp->tx_lock, flags);
		return 0;
	}
#ifdef NETIF_F_TSO
	mss = skb_shinfo(skb)->tso_size;
	if (mss) {
		txdp->Control_1 |= TXD_TCP_LSO_EN;
		txdp->Control_1 |= TXD_TCP_LSO_MSS(mss);
	}
#endif

	frg_cnt = skb_shinfo(skb)->nr_frags;
	frg_len = skb->len - skb->data_len;

	txdp->Buffer_Pointer = pci_map_single
	    (sp->pdev, skb->data, frg_len, PCI_DMA_TODEVICE);
	txdp->Host_Control = (unsigned long) skb;
	if (skb->ip_summed == CHECKSUM_HW) {
		txdp->Control_2 |=
		    (TXD_TX_CKO_IPV4_EN | TXD_TX_CKO_TCP_EN |
		     TXD_TX_CKO_UDP_EN);
	}

	txdp->Control_2 |= config->tx_intr_type;

	txdp->Control_1 |= (TXD_BUFFER0_SIZE(frg_len) |
			    TXD_GATHER_CODE_FIRST);
	txdp->Control_1 |= TXD_LIST_OWN_XENA;

	/* For fragmented SKB. */
	for (i = 0; i < frg_cnt; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		txdp++;
		txdp->Buffer_Pointer = (u64) pci_map_page
		    (sp->pdev, frag->page, frag->page_offset,
		     frag->size, PCI_DMA_TODEVICE);
		txdp->Control_1 |= TXD_BUFFER0_SIZE(frag->size);
	}
	txdp->Control_1 |= TXD_GATHER_CODE_LAST;

	tx_fifo = mac_control->tx_FIFO_start[queue];
	val64 = mac_control->fifos[queue].list_info[put_off].list_phy_addr;
	writeq(val64, &tx_fifo->TxDL_Pointer);

	val64 = (TX_FIFO_LAST_TXD_NUM(frg_cnt) | TX_FIFO_FIRST_LIST |
		 TX_FIFO_LAST_LIST);

#ifdef NETIF_F_TSO
	if (mss)
		val64 |= TX_FIFO_SPECIAL_FUNC;
#endif
	writeq(val64, &tx_fifo->List_Control);

	/* Perform a PCI read to flush previous writes */
	val64 = readq(&bar0->general_int_status);

	put_off++;
	put_off %= mac_control->fifos[queue].tx_curr_put_info.fifo_len + 1;
	mac_control->fifos[queue].tx_curr_put_info.offset = put_off;

	/* Avoid "put" pointer going beyond "get" pointer */
	if (((put_off + 1) % queue_len) == get_off) {
		DBG_PRINT(TX_DBG,
			  "No free TxDs for xmit, Put: 0x%x Get:0x%x\n",
			  put_off, get_off);
		netif_stop_queue(dev);
	}

	dev->trans_start = jiffies;
	spin_unlock_irqrestore(&sp->tx_lock, flags);

	return 0;
}

/**
 *  s2io_isr - ISR handler of the device .
 *  @irq: the irq of the device.
 *  @dev_id: a void pointer to the dev structure of the NIC.
 *  @pt_regs: pointer to the registers pushed on the stack.
 *  Description:  This function is the ISR handler of the device. It
 *  identifies the reason for the interrupt and calls the relevant
 *  service routines. As a contongency measure, this ISR allocates the
 *  recv buffers, if their numbers are below the panic value which is
 *  presently set to 25% of the original number of rcv buffers allocated.
 *  Return value:
 *   IRQ_HANDLED: will be returned if IRQ was handled by this routine
 *   IRQ_NONE: will be returned if interrupt is not from our device
 */
static irqreturn_t s2io_isr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *) dev_id;
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	int i;
	u64 reason = 0;
	mac_info_t *mac_control;
	struct config_param *config;

	atomic_inc(&sp->isr_cnt);
	mac_control = &sp->mac_control;
	config = &sp->config;

	/*
	 * Identify the cause for interrupt and call the appropriate
	 * interrupt handler. Causes for the interrupt could be;
	 * 1. Rx of packet.
	 * 2. Tx complete.
	 * 3. Link down.
	 * 4. Error in any functional blocks of the NIC.
	 */
	reason = readq(&bar0->general_int_status);

	if (!reason) {
		/* The interrupt was not raised by Xena. */
		atomic_dec(&sp->isr_cnt);
		return IRQ_NONE;
	}

	if (reason & (GEN_ERROR_INTR))
		alarm_intr_handler(sp);

#ifdef CONFIG_S2IO_NAPI
	if (reason & GEN_INTR_RXTRAFFIC) {
		if (netif_rx_schedule_prep(dev)) {
			en_dis_able_nic_intrs(sp, RX_TRAFFIC_INTR,
					      DISABLE_INTRS);
			__netif_rx_schedule(dev);
		}
	}
#else
	/* If Intr is because of Rx Traffic */
	if (reason & GEN_INTR_RXTRAFFIC) {
		for (i = 0; i < config->rx_ring_num; i++) {
			rx_intr_handler(&mac_control->rings[i]);
		}
	}
#endif

	/* If Intr is because of Tx Traffic */
	if (reason & GEN_INTR_TXTRAFFIC) {
		for (i = 0; i < config->tx_fifo_num; i++)
			tx_intr_handler(&mac_control->fifos[i]);
	}

	/*
	 * If the Rx buffer count is below the panic threshold then
	 * reallocate the buffers from the interrupt handler itself,
	 * else schedule a tasklet to reallocate the buffers.
	 */
#ifndef CONFIG_S2IO_NAPI
	for (i = 0; i < config->rx_ring_num; i++) {
		int ret;
		int rxb_size = atomic_read(&sp->rx_bufs_left[i]);
		int level = rx_buffer_level(sp, rxb_size, i);

		if ((level == PANIC) && (!TASKLET_IN_USE)) {
			DBG_PRINT(INTR_DBG, "%s: Rx BD hit ", dev->name);
			DBG_PRINT(INTR_DBG, "PANIC levels\n");
			if ((ret = fill_rx_buffers(sp, i)) == -ENOMEM) {
				DBG_PRINT(ERR_DBG, "%s:Out of memory",
					  dev->name);
				DBG_PRINT(ERR_DBG, " in ISR!!\n");
				clear_bit(0, (&sp->tasklet_status));
				atomic_dec(&sp->isr_cnt);
				return IRQ_HANDLED;
			}
			clear_bit(0, (&sp->tasklet_status));
		} else if (level == LOW) {
			tasklet_schedule(&sp->task);
		}
	}
#endif

	atomic_dec(&sp->isr_cnt);
	return IRQ_HANDLED;
}

/**
 * s2io_updt_stats -
 */
static void s2io_updt_stats(nic_t *sp)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64;
	int cnt = 0;

	if (atomic_read(&sp->card_state) == CARD_UP) {
		/* Apprx 30us on a 133 MHz bus */
		val64 = SET_UPDT_CLICKS(10) |
			STAT_CFG_ONE_SHOT_EN | STAT_CFG_STAT_EN;
		writeq(val64, &bar0->stat_cfg);
		do {
			udelay(100);
			val64 = readq(&bar0->stat_cfg);
			if (!(val64 & BIT(0)))
				break;
			cnt++;
			if (cnt == 5)
				break; /* Updt failed */
		} while(1);
	}
}

/**
 *  s2io_get_stats - Updates the device statistics structure.
 *  @dev : pointer to the device structure.
 *  Description:
 *  This function updates the device statistics structure in the s2io_nic
 *  structure and returns a pointer to the same.
 *  Return value:
 *  pointer to the updated net_device_stats structure.
 */

struct net_device_stats *s2io_get_stats(struct net_device *dev)
{
	nic_t *sp = dev->priv;
	mac_info_t *mac_control;
	struct config_param *config;


	mac_control = &sp->mac_control;
	config = &sp->config;

	/* Configure Stats for immediate updt */
	s2io_updt_stats(sp);

	sp->stats.tx_packets =
		le32_to_cpu(mac_control->stats_info->tmac_frms);
	sp->stats.tx_errors =
		le32_to_cpu(mac_control->stats_info->tmac_any_err_frms);
	sp->stats.rx_errors =
		le32_to_cpu(mac_control->stats_info->rmac_drop_frms);
	sp->stats.multicast =
		le32_to_cpu(mac_control->stats_info->rmac_vld_mcst_frms);
	sp->stats.rx_length_errors =
		le32_to_cpu(mac_control->stats_info->rmac_long_frms);

	return (&sp->stats);
}

/**
 *  s2io_set_multicast - entry point for multicast address enable/disable.
 *  @dev : pointer to the device structure
 *  Description:
 *  This function is a driver entry point which gets called by the kernel
 *  whenever multicast addresses must be enabled/disabled. This also gets
 *  called to set/reset promiscuous mode. Depending on the deivce flag, we
 *  determine, if multicast address must be enabled or if promiscuous mode
 *  is to be disabled etc.
 *  Return value:
 *  void.
 */

static void s2io_set_multicast(struct net_device *dev)
{
	int i, j, prev_cnt;
	struct dev_mc_list *mclist;
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64 = 0, multi_mac = 0x010203040506ULL, mask =
	    0xfeffffffffffULL;
	u64 dis_addr = 0xffffffffffffULL, mac_addr = 0;
	void __iomem *add;

	if ((dev->flags & IFF_ALLMULTI) && (!sp->m_cast_flg)) {
		/*  Enable all Multicast addresses */
		writeq(RMAC_ADDR_DATA0_MEM_ADDR(multi_mac),
		       &bar0->rmac_addr_data0_mem);
		writeq(RMAC_ADDR_DATA1_MEM_MASK(mask),
		       &bar0->rmac_addr_data1_mem);
		val64 = RMAC_ADDR_CMD_MEM_WE |
		    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
		    RMAC_ADDR_CMD_MEM_OFFSET(MAC_MC_ALL_MC_ADDR_OFFSET);
		writeq(val64, &bar0->rmac_addr_cmd_mem);
		/* Wait till command completes */
		wait_for_cmd_complete(sp);

		sp->m_cast_flg = 1;
		sp->all_multi_pos = MAC_MC_ALL_MC_ADDR_OFFSET;
	} else if ((dev->flags & IFF_ALLMULTI) && (sp->m_cast_flg)) {
		/*  Disable all Multicast addresses */
		writeq(RMAC_ADDR_DATA0_MEM_ADDR(dis_addr),
		       &bar0->rmac_addr_data0_mem);
		writeq(RMAC_ADDR_DATA1_MEM_MASK(0x0),
		       &bar0->rmac_addr_data1_mem);
		val64 = RMAC_ADDR_CMD_MEM_WE |
		    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
		    RMAC_ADDR_CMD_MEM_OFFSET(sp->all_multi_pos);
		writeq(val64, &bar0->rmac_addr_cmd_mem);
		/* Wait till command completes */
		wait_for_cmd_complete(sp);

		sp->m_cast_flg = 0;
		sp->all_multi_pos = 0;
	}

	if ((dev->flags & IFF_PROMISC) && (!sp->promisc_flg)) {
		/*  Put the NIC into promiscuous mode */
		add = &bar0->mac_cfg;
		val64 = readq(&bar0->mac_cfg);
		val64 |= MAC_CFG_RMAC_PROM_ENABLE;

		writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
		writel((u32) val64, add);
		writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
		writel((u32) (val64 >> 32), (add + 4));

		val64 = readq(&bar0->mac_cfg);
		sp->promisc_flg = 1;
		DBG_PRINT(ERR_DBG, "%s: entered promiscuous mode\n",
			  dev->name);
	} else if (!(dev->flags & IFF_PROMISC) && (sp->promisc_flg)) {
		/*  Remove the NIC from promiscuous mode */
		add = &bar0->mac_cfg;
		val64 = readq(&bar0->mac_cfg);
		val64 &= ~MAC_CFG_RMAC_PROM_ENABLE;

		writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
		writel((u32) val64, add);
		writeq(RMAC_CFG_KEY(0x4C0D), &bar0->rmac_cfg_key);
		writel((u32) (val64 >> 32), (add + 4));

		val64 = readq(&bar0->mac_cfg);
		sp->promisc_flg = 0;
		DBG_PRINT(ERR_DBG, "%s: left promiscuous mode\n",
			  dev->name);
	}

	/*  Update individual M_CAST address list */
	if ((!sp->m_cast_flg) && dev->mc_count) {
		if (dev->mc_count >
		    (MAX_ADDRS_SUPPORTED - MAC_MC_ADDR_START_OFFSET - 1)) {
			DBG_PRINT(ERR_DBG, "%s: No more Rx filters ",
				  dev->name);
			DBG_PRINT(ERR_DBG, "can be added, please enable ");
			DBG_PRINT(ERR_DBG, "ALL_MULTI instead\n");
			return;
		}

		prev_cnt = sp->mc_addr_count;
		sp->mc_addr_count = dev->mc_count;

		/* Clear out the previous list of Mc in the H/W. */
		for (i = 0; i < prev_cnt; i++) {
			writeq(RMAC_ADDR_DATA0_MEM_ADDR(dis_addr),
			       &bar0->rmac_addr_data0_mem);
			writeq(RMAC_ADDR_DATA1_MEM_MASK(0ULL),
				&bar0->rmac_addr_data1_mem);
			val64 = RMAC_ADDR_CMD_MEM_WE |
			    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
			    RMAC_ADDR_CMD_MEM_OFFSET
			    (MAC_MC_ADDR_START_OFFSET + i);
			writeq(val64, &bar0->rmac_addr_cmd_mem);

			/* Wait for command completes */
			if (wait_for_cmd_complete(sp)) {
				DBG_PRINT(ERR_DBG, "%s: Adding ",
					  dev->name);
				DBG_PRINT(ERR_DBG, "Multicasts failed\n");
				return;
			}
		}

		/* Create the new Rx filter list and update the same in H/W. */
		for (i = 0, mclist = dev->mc_list; i < dev->mc_count;
		     i++, mclist = mclist->next) {
			memcpy(sp->usr_addrs[i].addr, mclist->dmi_addr,
			       ETH_ALEN);
			for (j = 0; j < ETH_ALEN; j++) {
				mac_addr |= mclist->dmi_addr[j];
				mac_addr <<= 8;
			}
			mac_addr >>= 8;
			writeq(RMAC_ADDR_DATA0_MEM_ADDR(mac_addr),
			       &bar0->rmac_addr_data0_mem);
			writeq(RMAC_ADDR_DATA1_MEM_MASK(0ULL),
				&bar0->rmac_addr_data1_mem);
			val64 = RMAC_ADDR_CMD_MEM_WE |
			    RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
			    RMAC_ADDR_CMD_MEM_OFFSET
			    (i + MAC_MC_ADDR_START_OFFSET);
			writeq(val64, &bar0->rmac_addr_cmd_mem);

			/* Wait for command completes */
			if (wait_for_cmd_complete(sp)) {
				DBG_PRINT(ERR_DBG, "%s: Adding ",
					  dev->name);
				DBG_PRINT(ERR_DBG, "Multicasts failed\n");
				return;
			}
		}
	}
}

/**
 *  s2io_set_mac_addr - Programs the Xframe mac address
 *  @dev : pointer to the device structure.
 *  @addr: a uchar pointer to the new mac address which is to be set.
 *  Description : This procedure will program the Xframe to receive
 *  frames with new Mac Address
 *  Return value: SUCCESS on success and an appropriate (-)ve integer
 *  as defined in errno.h file on failure.
 */

int s2io_set_mac_addr(struct net_device *dev, u8 * addr)
{
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	register u64 val64, mac_addr = 0;
	int i;

	/*
	 * Set the new MAC address as the new unicast filter and reflect this
	 * change on the device address registered with the OS. It will be
	 * at offset 0.
	 */
	for (i = 0; i < ETH_ALEN; i++) {
		mac_addr <<= 8;
		mac_addr |= addr[i];
	}

	writeq(RMAC_ADDR_DATA0_MEM_ADDR(mac_addr),
	       &bar0->rmac_addr_data0_mem);

	val64 =
	    RMAC_ADDR_CMD_MEM_WE | RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
	    RMAC_ADDR_CMD_MEM_OFFSET(0);
	writeq(val64, &bar0->rmac_addr_cmd_mem);
	/* Wait till command completes */
	if (wait_for_cmd_complete(sp)) {
		DBG_PRINT(ERR_DBG, "%s: set_mac_addr failed\n", dev->name);
		return FAILURE;
	}

	return SUCCESS;
}

/**
 * s2io_ethtool_sset - Sets different link parameters.
 * @sp : private member of the device structure, which is a pointer to the  * s2io_nic structure.
 * @info: pointer to the structure with parameters given by ethtool to set
 * link information.
 * Description:
 * The function sets different link parameters provided by the user onto
 * the NIC.
 * Return value:
 * 0 on success.
*/

static int s2io_ethtool_sset(struct net_device *dev,
			     struct ethtool_cmd *info)
{
	nic_t *sp = dev->priv;
	if ((info->autoneg == AUTONEG_ENABLE) ||
	    (info->speed != SPEED_10000) || (info->duplex != DUPLEX_FULL))
		return -EINVAL;
	else {
		s2io_close(sp->dev);
		s2io_open(sp->dev);
	}

	return 0;
}

/**
 * s2io_ethtol_gset - Return link specific information.
 * @sp : private member of the device structure, pointer to the
 *      s2io_nic structure.
 * @info : pointer to the structure with parameters given by ethtool
 * to return link information.
 * Description:
 * Returns link specific information like speed, duplex etc.. to ethtool.
 * Return value :
 * return 0 on success.
 */

static int s2io_ethtool_gset(struct net_device *dev, struct ethtool_cmd *info)
{
	nic_t *sp = dev->priv;
	info->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
	info->advertising = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
	info->port = PORT_FIBRE;
	/* info->transceiver?? TODO */

	if (netif_carrier_ok(sp->dev)) {
		info->speed = 10000;
		info->duplex = DUPLEX_FULL;
	} else {
		info->speed = -1;
		info->duplex = -1;
	}

	info->autoneg = AUTONEG_DISABLE;
	return 0;
}

/**
 * s2io_ethtool_gdrvinfo - Returns driver specific information.
 * @sp : private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @info : pointer to the structure with parameters given by ethtool to
 * return driver information.
 * Description:
 * Returns driver specefic information like name, version etc.. to ethtool.
 * Return value:
 *  void
 */

static void s2io_ethtool_gdrvinfo(struct net_device *dev,
				  struct ethtool_drvinfo *info)
{
	nic_t *sp = dev->priv;

	strncpy(info->driver, s2io_driver_name, sizeof(s2io_driver_name));
	strncpy(info->version, s2io_driver_version,
		sizeof(s2io_driver_version));
	strncpy(info->fw_version, "", 32);
	strncpy(info->bus_info, pci_name(sp->pdev), 32);
	info->regdump_len = XENA_REG_SPACE;
	info->eedump_len = XENA_EEPROM_SPACE;
	info->testinfo_len = S2IO_TEST_LEN;
	info->n_stats = S2IO_STAT_LEN;
}

/**
 *  s2io_ethtool_gregs - dumps the entire space of Xfame into the buffer.
 *  @sp: private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  @regs : pointer to the structure with parameters given by ethtool for
 *  dumping the registers.
 *  @reg_space: The input argumnet into which all the registers are dumped.
 *  Description:
 *  Dumps the entire register space of xFrame NIC into the user given
 *  buffer area.
 * Return value :
 * void .
*/

static void s2io_ethtool_gregs(struct net_device *dev,
			       struct ethtool_regs *regs, void *space)
{
	int i;
	u64 reg;
	u8 *reg_space = (u8 *) space;
	nic_t *sp = dev->priv;

	regs->len = XENA_REG_SPACE;
	regs->version = sp->pdev->subsystem_device;

	for (i = 0; i < regs->len; i += 8) {
		reg = readq(sp->bar0 + i);
		memcpy((reg_space + i), &reg, 8);
	}
}

/**
 *  s2io_phy_id  - timer function that alternates adapter LED.
 *  @data : address of the private member of the device structure, which
 *  is a pointer to the s2io_nic structure, provided as an u32.
 * Description: This is actually the timer function that alternates the
 * adapter LED bit of the adapter control bit to set/reset every time on
 * invocation. The timer is set for 1/2 a second, hence tha NIC blinks
 *  once every second.
*/
static void s2io_phy_id(unsigned long data)
{
	nic_t *sp = (nic_t *) data;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64 = 0;
	u16 subid;

	subid = sp->pdev->subsystem_device;
	if ((subid & 0xFF) >= 0x07) {
		val64 = readq(&bar0->gpio_control);
		val64 ^= GPIO_CTRL_GPIO_0;
		writeq(val64, &bar0->gpio_control);
	} else {
		val64 = readq(&bar0->adapter_control);
		val64 ^= ADAPTER_LED_ON;
		writeq(val64, &bar0->adapter_control);
	}

	mod_timer(&sp->id_timer, jiffies + HZ / 2);
}

/**
 * s2io_ethtool_idnic - To physically identify the nic on the system.
 * @sp : private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @id : pointer to the structure with identification parameters given by
 * ethtool.
 * Description: Used to physically identify the NIC on the system.
 * The Link LED will blink for a time specified by the user for
 * identification.
 * NOTE: The Link has to be Up to be able to blink the LED. Hence
 * identification is possible only if it's link is up.
 * Return value:
 * int , returns 0 on success
 */

static int s2io_ethtool_idnic(struct net_device *dev, u32 data)
{
	u64 val64 = 0, last_gpio_ctrl_val;
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u16 subid;

	subid = sp->pdev->subsystem_device;
	last_gpio_ctrl_val = readq(&bar0->gpio_control);
	if ((subid & 0xFF) < 0x07) {
		val64 = readq(&bar0->adapter_control);
		if (!(val64 & ADAPTER_CNTL_EN)) {
			printk(KERN_ERR
			       "Adapter Link down, cannot blink LED\n");
			return -EFAULT;
		}
	}
	if (sp->id_timer.function == NULL) {
		init_timer(&sp->id_timer);
		sp->id_timer.function = s2io_phy_id;
		sp->id_timer.data = (unsigned long) sp;
	}
	mod_timer(&sp->id_timer, jiffies);
	if (data)
		msleep_interruptible(data * HZ);
	else
		msleep_interruptible(MAX_FLICKER_TIME);
	del_timer_sync(&sp->id_timer);

	if (CARDS_WITH_FAULTY_LINK_INDICATORS(subid)) {
		writeq(last_gpio_ctrl_val, &bar0->gpio_control);
		last_gpio_ctrl_val = readq(&bar0->gpio_control);
	}

	return 0;
}

/**
 * s2io_ethtool_getpause_data -Pause frame frame generation and reception.
 * @sp : private member of the device structure, which is a pointer to the
 *	s2io_nic structure.
 * @ep : pointer to the structure with pause parameters given by ethtool.
 * Description:
 * Returns the Pause frame generation and reception capability of the NIC.
 * Return value:
 *  void
 */
static void s2io_ethtool_getpause_data(struct net_device *dev,
				       struct ethtool_pauseparam *ep)
{
	u64 val64;
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;

	val64 = readq(&bar0->rmac_pause_cfg);
	if (val64 & RMAC_PAUSE_GEN_ENABLE)
		ep->tx_pause = TRUE;
	if (val64 & RMAC_PAUSE_RX_ENABLE)
		ep->rx_pause = TRUE;
	ep->autoneg = FALSE;
}

/**
 * s2io_ethtool_setpause_data -  set/reset pause frame generation.
 * @sp : private member of the device structure, which is a pointer to the
 *      s2io_nic structure.
 * @ep : pointer to the structure with pause parameters given by ethtool.
 * Description:
 * It can be used to set or reset Pause frame generation or reception
 * support of the NIC.
 * Return value:
 * int, returns 0 on Success
 */

static int s2io_ethtool_setpause_data(struct net_device *dev,
			       struct ethtool_pauseparam *ep)
{
	u64 val64;
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;

	val64 = readq(&bar0->rmac_pause_cfg);
	if (ep->tx_pause)
		val64 |= RMAC_PAUSE_GEN_ENABLE;
	else
		val64 &= ~RMAC_PAUSE_GEN_ENABLE;
	if (ep->rx_pause)
		val64 |= RMAC_PAUSE_RX_ENABLE;
	else
		val64 &= ~RMAC_PAUSE_RX_ENABLE;
	writeq(val64, &bar0->rmac_pause_cfg);
	return 0;
}

/**
 * read_eeprom - reads 4 bytes of data from user given offset.
 * @sp : private member of the device structure, which is a pointer to the
 *      s2io_nic structure.
 * @off : offset at which the data must be written
 * @data : Its an output parameter where the data read at the given
 *	offset is stored.
 * Description:
 * Will read 4 bytes of data from the user given offset and return the
 * read data.
 * NOTE: Will allow to read only part of the EEPROM visible through the
 *   I2C bus.
 * Return value:
 *  -1 on failure and 0 on success.
 */

#define S2IO_DEV_ID		5
static int read_eeprom(nic_t * sp, int off, u32 * data)
{
	int ret = -1;
	u32 exit_cnt = 0;
	u64 val64;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;

	val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
	    I2C_CONTROL_BYTE_CNT(0x3) | I2C_CONTROL_READ |
	    I2C_CONTROL_CNTL_START;
	SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);

	while (exit_cnt < 5) {
		val64 = readq(&bar0->i2c_control);
		if (I2C_CONTROL_CNTL_END(val64)) {
			*data = I2C_CONTROL_GET_DATA(val64);
			ret = 0;
			break;
		}
		msleep(50);
		exit_cnt++;
	}

	return ret;
}

/**
 *  write_eeprom - actually writes the relevant part of the data value.
 *  @sp : private member of the device structure, which is a pointer to the
 *       s2io_nic structure.
 *  @off : offset at which the data must be written
 *  @data : The data that is to be written
 *  @cnt : Number of bytes of the data that are actually to be written into
 *  the Eeprom. (max of 3)
 * Description:
 *  Actually writes the relevant part of the data value into the Eeprom
 *  through the I2C bus.
 * Return value:
 *  0 on success, -1 on failure.
 */

static int write_eeprom(nic_t * sp, int off, u32 data, int cnt)
{
	int exit_cnt = 0, ret = -1;
	u64 val64;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;

	val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
	    I2C_CONTROL_BYTE_CNT(cnt) | I2C_CONTROL_SET_DATA(data) |
	    I2C_CONTROL_CNTL_START;
	SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);

	while (exit_cnt < 5) {
		val64 = readq(&bar0->i2c_control);
		if (I2C_CONTROL_CNTL_END(val64)) {
			if (!(val64 & I2C_CONTROL_NACK))
				ret = 0;
			break;
		}
		msleep(50);
		exit_cnt++;
	}

	return ret;
}

/**
 *  s2io_ethtool_geeprom  - reads the value stored in the Eeprom.
 *  @sp : private member of the device structure, which is a pointer to the *       s2io_nic structure.
 *  @eeprom : pointer to the user level structure provided by ethtool,
 *  containing all relevant information.
 *  @data_buf : user defined value to be written into Eeprom.
 *  Description: Reads the values stored in the Eeprom at given offset
 *  for a given length. Stores these values int the input argument data
 *  buffer 'data_buf' and returns these to the caller (ethtool.)
 *  Return value:
 *  int  0 on success
 */

static int s2io_ethtool_geeprom(struct net_device *dev,
			 struct ethtool_eeprom *eeprom, u8 * data_buf)
{
	u32 data, i, valid;
	nic_t *sp = dev->priv;

	eeprom->magic = sp->pdev->vendor | (sp->pdev->device << 16);

	if ((eeprom->offset + eeprom->len) > (XENA_EEPROM_SPACE))
		eeprom->len = XENA_EEPROM_SPACE - eeprom->offset;

	for (i = 0; i < eeprom->len; i += 4) {
		if (read_eeprom(sp, (eeprom->offset + i), &data)) {
			DBG_PRINT(ERR_DBG, "Read of EEPROM failed\n");
			return -EFAULT;
		}
		valid = INV(data);
		memcpy((data_buf + i), &valid, 4);
	}
	return 0;
}

/**
 *  s2io_ethtool_seeprom - tries to write the user provided value in Eeprom
 *  @sp : private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  @eeprom : pointer to the user level structure provided by ethtool,
 *  containing all relevant information.
 *  @data_buf ; user defined value to be written into Eeprom.
 *  Description:
 *  Tries to write the user provided value in the Eeprom, at the offset
 *  given by the user.
 *  Return value:
 *  0 on success, -EFAULT on failure.
 */

static int s2io_ethtool_seeprom(struct net_device *dev,
				struct ethtool_eeprom *eeprom,
				u8 * data_buf)
{
	int len = eeprom->len, cnt = 0;
	u32 valid = 0, data;
	nic_t *sp = dev->priv;

	if (eeprom->magic != (sp->pdev->vendor | (sp->pdev->device << 16))) {
		DBG_PRINT(ERR_DBG,
			  "ETHTOOL_WRITE_EEPROM Err: Magic value ");
		DBG_PRINT(ERR_DBG, "is wrong, Its not 0x%x\n",
			  eeprom->magic);
		return -EFAULT;
	}

	while (len) {
		data = (u32) data_buf[cnt] & 0x000000FF;
		if (data) {
			valid = (u32) (data << 24);
		} else
			valid = data;

		if (write_eeprom(sp, (eeprom->offset + cnt), valid, 0)) {
			DBG_PRINT(ERR_DBG,
				  "ETHTOOL_WRITE_EEPROM Err: Cannot ");
			DBG_PRINT(ERR_DBG,
				  "write into the specified offset\n");
			return -EFAULT;
		}
		cnt++;
		len--;
	}

	return 0;
}

/**
 * s2io_register_test - reads and writes into all clock domains.
 * @sp : private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @data : variable that returns the result of each of the test conducted b
 * by the driver.
 * Description:
 * Read and write into all clock domains. The NIC has 3 clock domains,
 * see that registers in all the three regions are accessible.
 * Return value:
 * 0 on success.
 */

static int s2io_register_test(nic_t * sp, uint64_t * data)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64 = 0;
	int fail = 0;

	val64 = readq(&bar0->pif_rd_swapper_fb);
	if (val64 != 0x123456789abcdefULL) {
		fail = 1;
		DBG_PRINT(INFO_DBG, "Read Test level 1 fails\n");
	}

	val64 = readq(&bar0->rmac_pause_cfg);
	if (val64 != 0xc000ffff00000000ULL) {
		fail = 1;
		DBG_PRINT(INFO_DBG, "Read Test level 2 fails\n");
	}

	val64 = readq(&bar0->rx_queue_cfg);
	if (val64 != 0x0808080808080808ULL) {
		fail = 1;
		DBG_PRINT(INFO_DBG, "Read Test level 3 fails\n");
	}

	val64 = readq(&bar0->xgxs_efifo_cfg);
	if (val64 != 0x000000001923141EULL) {
		fail = 1;
		DBG_PRINT(INFO_DBG, "Read Test level 4 fails\n");
	}

	val64 = 0x5A5A5A5A5A5A5A5AULL;
	writeq(val64, &bar0->xmsi_data);
	val64 = readq(&bar0->xmsi_data);
	if (val64 != 0x5A5A5A5A5A5A5A5AULL) {
		fail = 1;
		DBG_PRINT(ERR_DBG, "Write Test level 1 fails\n");
	}

	val64 = 0xA5A5A5A5A5A5A5A5ULL;
	writeq(val64, &bar0->xmsi_data);
	val64 = readq(&bar0->xmsi_data);
	if (val64 != 0xA5A5A5A5A5A5A5A5ULL) {
		fail = 1;
		DBG_PRINT(ERR_DBG, "Write Test level 2 fails\n");
	}

	*data = fail;
	return 0;
}

/**
 * s2io_eeprom_test - to verify that EEprom in the xena can be programmed.
 * @sp : private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @data:variable that returns the result of each of the test conducted by
 * the driver.
 * Description:
 * Verify that EEPROM in the xena can be programmed using I2C_CONTROL
 * register.
 * Return value:
 * 0 on success.
 */

static int s2io_eeprom_test(nic_t * sp, uint64_t * data)
{
	int fail = 0;
	u32 ret_data;

	/* Test Write Error at offset 0 */
	if (!write_eeprom(sp, 0, 0, 3))
		fail = 1;

	/* Test Write at offset 4f0 */
	if (write_eeprom(sp, 0x4F0, 0x01234567, 3))
		fail = 1;
	if (read_eeprom(sp, 0x4F0, &ret_data))
		fail = 1;

	if (ret_data != 0x01234567)
		fail = 1;

	/* Reset the EEPROM data go FFFF */
	write_eeprom(sp, 0x4F0, 0xFFFFFFFF, 3);

	/* Test Write Request Error at offset 0x7c */
	if (!write_eeprom(sp, 0x07C, 0, 3))
		fail = 1;

	/* Test Write Request at offset 0x7fc */
	if (write_eeprom(sp, 0x7FC, 0x01234567, 3))
		fail = 1;
	if (read_eeprom(sp, 0x7FC, &ret_data))
		fail = 1;

	if (ret_data != 0x01234567)
		fail = 1;

	/* Reset the EEPROM data go FFFF */
	write_eeprom(sp, 0x7FC, 0xFFFFFFFF, 3);

	/* Test Write Error at offset 0x80 */
	if (!write_eeprom(sp, 0x080, 0, 3))
		fail = 1;

	/* Test Write Error at offset 0xfc */
	if (!write_eeprom(sp, 0x0FC, 0, 3))
		fail = 1;

	/* Test Write Error at offset 0x100 */
	if (!write_eeprom(sp, 0x100, 0, 3))
		fail = 1;

	/* Test Write Error at offset 4ec */
	if (!write_eeprom(sp, 0x4EC, 0, 3))
		fail = 1;

	*data = fail;
	return 0;
}

/**
 * s2io_bist_test - invokes the MemBist test of the card .
 * @sp : private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @data:variable that returns the result of each of the test conducted by
 * the driver.
 * Description:
 * This invokes the MemBist test of the card. We give around
 * 2 secs time for the Test to complete. If it's still not complete
 * within this peiod, we consider that the test failed.
 * Return value:
 * 0 on success and -1 on failure.
 */

static int s2io_bist_test(nic_t * sp, uint64_t * data)
{
	u8 bist = 0;
	int cnt = 0, ret = -1;

	pci_read_config_byte(sp->pdev, PCI_BIST, &bist);
	bist |= PCI_BIST_START;
	pci_write_config_word(sp->pdev, PCI_BIST, bist);

	while (cnt < 20) {
		pci_read_config_byte(sp->pdev, PCI_BIST, &bist);
		if (!(bist & PCI_BIST_START)) {
			*data = (bist & PCI_BIST_CODE_MASK);
			ret = 0;
			break;
		}
		msleep(100);
		cnt++;
	}

	return ret;
}

/**
 * s2io-link_test - verifies the link state of the nic
 * @sp ; private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @data: variable that returns the result of each of the test conducted by
 * the driver.
 * Description:
 * The function verifies the link state of the NIC and updates the input
 * argument 'data' appropriately.
 * Return value:
 * 0 on success.
 */

static int s2io_link_test(nic_t * sp, uint64_t * data)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64;

	val64 = readq(&bar0->adapter_status);
	if (val64 & ADAPTER_STATUS_RMAC_LOCAL_FAULT)
		*data = 1;

	return 0;
}

/**
 * s2io_rldram_test - offline test for access to the RldRam chip on the NIC
 * @sp - private member of the device structure, which is a pointer to the
 * s2io_nic structure.
 * @data - variable that returns the result of each of the test
 * conducted by the driver.
 * Description:
 *  This is one of the offline test that tests the read and write
 *  access to the RldRam chip on the NIC.
 * Return value:
 *  0 on success.
 */

static int s2io_rldram_test(nic_t * sp, uint64_t * data)
{
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	u64 val64;
	int cnt, iteration = 0, test_pass = 0;

	val64 = readq(&bar0->adapter_control);
	val64 &= ~ADAPTER_ECC_EN;
	writeq(val64, &bar0->adapter_control);

	val64 = readq(&bar0->mc_rldram_test_ctrl);
	val64 |= MC_RLDRAM_TEST_MODE;
	writeq(val64, &bar0->mc_rldram_test_ctrl);

	val64 = readq(&bar0->mc_rldram_mrs);
	val64 |= MC_RLDRAM_QUEUE_SIZE_ENABLE;
	SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_mrs, UF);

	val64 |= MC_RLDRAM_MRS_ENABLE;
	SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_mrs, UF);

	while (iteration < 2) {
		val64 = 0x55555555aaaa0000ULL;
		if (iteration == 1) {
			val64 ^= 0xFFFFFFFFFFFF0000ULL;
		}
		writeq(val64, &bar0->mc_rldram_test_d0);

		val64 = 0xaaaa5a5555550000ULL;
		if (iteration == 1) {
			val64 ^= 0xFFFFFFFFFFFF0000ULL;
		}
		writeq(val64, &bar0->mc_rldram_test_d1);

		val64 = 0x55aaaaaaaa5a0000ULL;
		if (iteration == 1) {
			val64 ^= 0xFFFFFFFFFFFF0000ULL;
		}
		writeq(val64, &bar0->mc_rldram_test_d2);

		val64 = (u64) (0x0000003fffff0000ULL);
		writeq(val64, &bar0->mc_rldram_test_add);


		val64 = MC_RLDRAM_TEST_MODE;
		writeq(val64, &bar0->mc_rldram_test_ctrl);

		val64 |=
		    MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_WRITE |
		    MC_RLDRAM_TEST_GO;
		writeq(val64, &bar0->mc_rldram_test_ctrl);

		for (cnt = 0; cnt < 5; cnt++) {
			val64 = readq(&bar0->mc_rldram_test_ctrl);
			if (val64 & MC_RLDRAM_TEST_DONE)
				break;
			msleep(200);
		}

		if (cnt == 5)
			break;

		val64 = MC_RLDRAM_TEST_MODE;
		writeq(val64, &bar0->mc_rldram_test_ctrl);

		val64 |= MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_GO;
		writeq(val64, &bar0->mc_rldram_test_ctrl);

		for (cnt = 0; cnt < 5; cnt++) {
			val64 = readq(&bar0->mc_rldram_test_ctrl);
			if (val64 & MC_RLDRAM_TEST_DONE)
				break;
			msleep(500);
		}

		if (cnt == 5)
			break;

		val64 = readq(&bar0->mc_rldram_test_ctrl);
		if (val64 & MC_RLDRAM_TEST_PASS)
			test_pass = 1;

		iteration++;
	}

	if (!test_pass)
		*data = 1;
	else
		*data = 0;

	return 0;
}

/**
 *  s2io_ethtool_test - conducts 6 tsets to determine the health of card.
 *  @sp : private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  @ethtest : pointer to a ethtool command specific structure that will be
 *  returned to the user.
 *  @data : variable that returns the result of each of the test
 * conducted by the driver.
 * Description:
 *  This function conducts 6 tests ( 4 offline and 2 online) to determine
 *  the health of the card.
 * Return value:
 *  void
 */

static void s2io_ethtool_test(struct net_device *dev,
			      struct ethtool_test *ethtest,
			      uint64_t * data)
{
	nic_t *sp = dev->priv;
	int orig_state = netif_running(sp->dev);

	if (ethtest->flags == ETH_TEST_FL_OFFLINE) {
		/* Offline Tests. */
		if (orig_state)
			s2io_close(sp->dev);

		if (s2io_register_test(sp, &data[0]))
			ethtest->flags |= ETH_TEST_FL_FAILED;

		s2io_reset(sp);

		if (s2io_rldram_test(sp, &data[3]))
			ethtest->flags |= ETH_TEST_FL_FAILED;

		s2io_reset(sp);

		if (s2io_eeprom_test(sp, &data[1]))
			ethtest->flags |= ETH_TEST_FL_FAILED;

		if (s2io_bist_test(sp, &data[4]))
			ethtest->flags |= ETH_TEST_FL_FAILED;

		if (orig_state)
			s2io_open(sp->dev);

		data[2] = 0;
	} else {
		/* Online Tests. */
		if (!orig_state) {
			DBG_PRINT(ERR_DBG,
				  "%s: is not up, cannot run test\n",
				  dev->name);
			data[0] = -1;
			data[1] = -1;
			data[2] = -1;
			data[3] = -1;
			data[4] = -1;
		}

		if (s2io_link_test(sp, &data[2]))
			ethtest->flags |= ETH_TEST_FL_FAILED;

		data[0] = 0;
		data[1] = 0;
		data[3] = 0;
		data[4] = 0;
	}
}

static void s2io_get_ethtool_stats(struct net_device *dev,
				   struct ethtool_stats *estats,
				   u64 * tmp_stats)
{
	int i = 0;
	nic_t *sp = dev->priv;
	StatInfo_t *stat_info = sp->mac_control.stats_info;

	s2io_updt_stats(sp);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_data_octets);
	tmp_stats[i++] = le64_to_cpu(stat_info->tmac_drop_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_mcst_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_bcst_frms);
	tmp_stats[i++] = le64_to_cpu(stat_info->tmac_pause_ctrl_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_any_err_frms);
	tmp_stats[i++] = le64_to_cpu(stat_info->tmac_vld_ip_octets);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_vld_ip);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_drop_ip);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_icmp);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_rst_tcp);
	tmp_stats[i++] = le64_to_cpu(stat_info->tmac_tcp);
	tmp_stats[i++] = le32_to_cpu(stat_info->tmac_udp);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_vld_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_data_octets);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_fcs_err_frms);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_drop_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_vld_mcst_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_vld_bcst_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_in_rng_len_err_frms);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_long_frms);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_pause_ctrl_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_discarded_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_usized_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_osized_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_frag_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_jabber_frms);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_ip);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_ip_octets);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_hdr_err_ip);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_drop_ip);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_icmp);
	tmp_stats[i++] = le64_to_cpu(stat_info->rmac_tcp);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_udp);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_err_drp_udp);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_pause_cnt);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_accepted_ip);
	tmp_stats[i++] = le32_to_cpu(stat_info->rmac_err_tcp);
	tmp_stats[i++] = 0;
	tmp_stats[i++] = stat_info->sw_stat.single_ecc_errs;
	tmp_stats[i++] = stat_info->sw_stat.double_ecc_errs;
}

int s2io_ethtool_get_regs_len(struct net_device *dev)
{
	return (XENA_REG_SPACE);
}


u32 s2io_ethtool_get_rx_csum(struct net_device * dev)
{
	nic_t *sp = dev->priv;

	return (sp->rx_csum);
}
int s2io_ethtool_set_rx_csum(struct net_device *dev, u32 data)
{
	nic_t *sp = dev->priv;

	if (data)
		sp->rx_csum = 1;
	else
		sp->rx_csum = 0;

	return 0;
}
int s2io_get_eeprom_len(struct net_device *dev)
{
	return (XENA_EEPROM_SPACE);
}

int s2io_ethtool_self_test_count(struct net_device *dev)
{
	return (S2IO_TEST_LEN);
}
void s2io_ethtool_get_strings(struct net_device *dev,
			      u32 stringset, u8 * data)
{
	switch (stringset) {
	case ETH_SS_TEST:
		memcpy(data, s2io_gstrings, S2IO_STRINGS_LEN);
		break;
	case ETH_SS_STATS:
		memcpy(data, &ethtool_stats_keys,
		       sizeof(ethtool_stats_keys));
	}
}
static int s2io_ethtool_get_stats_count(struct net_device *dev)
{
	return (S2IO_STAT_LEN);
}

int s2io_ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_IP_CSUM;
	else
		dev->features &= ~NETIF_F_IP_CSUM;

	return 0;
}


static struct ethtool_ops netdev_ethtool_ops = {
	.get_settings = s2io_ethtool_gset,
	.set_settings = s2io_ethtool_sset,
	.get_drvinfo = s2io_ethtool_gdrvinfo,
	.get_regs_len = s2io_ethtool_get_regs_len,
	.get_regs = s2io_ethtool_gregs,
	.get_link = ethtool_op_get_link,
	.get_eeprom_len = s2io_get_eeprom_len,
	.get_eeprom = s2io_ethtool_geeprom,
	.set_eeprom = s2io_ethtool_seeprom,
	.get_pauseparam = s2io_ethtool_getpause_data,
	.set_pauseparam = s2io_ethtool_setpause_data,
	.get_rx_csum = s2io_ethtool_get_rx_csum,
	.set_rx_csum = s2io_ethtool_set_rx_csum,
	.get_tx_csum = ethtool_op_get_tx_csum,
	.set_tx_csum = s2io_ethtool_op_set_tx_csum,
	.get_sg = ethtool_op_get_sg,
	.set_sg = ethtool_op_set_sg,
#ifdef NETIF_F_TSO
	.get_tso = ethtool_op_get_tso,
	.set_tso = ethtool_op_set_tso,
#endif
	.self_test_count = s2io_ethtool_self_test_count,
	.self_test = s2io_ethtool_test,
	.get_strings = s2io_ethtool_get_strings,
	.phys_id = s2io_ethtool_idnic,
	.get_stats_count = s2io_ethtool_get_stats_count,
	.get_ethtool_stats = s2io_get_ethtool_stats
};

/**
 *  s2io_ioctl - Entry point for the Ioctl
 *  @dev :  Device pointer.
 *  @ifr :  An IOCTL specefic structure, that can contain a pointer to
 *  a proprietary structure used to pass information to the driver.
 *  @cmd :  This is used to distinguish between the different commands that
 *  can be passed to the IOCTL functions.
 *  Description:
 *  Currently there are no special functionality supported in IOCTL, hence
 *  function always return EOPNOTSUPPORTED
 */

int s2io_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	return -EOPNOTSUPP;
}

/**
 *  s2io_change_mtu - entry point to change MTU size for the device.
 *   @dev : device pointer.
 *   @new_mtu : the new MTU size for the device.
 *   Description: A driver entry point to change MTU size for the device.
 *   Before changing the MTU the device must be stopped.
 *  Return value:
 *   0 on success and an appropriate (-)ve integer as defined in errno.h
 *   file on failure.
 */

int s2io_change_mtu(struct net_device *dev, int new_mtu)
{
	nic_t *sp = dev->priv;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	register u64 val64;

	if (netif_running(dev)) {
		DBG_PRINT(ERR_DBG, "%s: Must be stopped to ", dev->name);
		DBG_PRINT(ERR_DBG, "change its MTU\n");
		return -EBUSY;
	}

	if ((new_mtu < MIN_MTU) || (new_mtu > S2IO_JUMBO_SIZE)) {
		DBG_PRINT(ERR_DBG, "%s: MTU size is invalid.\n",
			  dev->name);
		return -EPERM;
	}

	/* Set the new MTU into the PYLD register of the NIC */
	val64 = new_mtu;
	writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);

	dev->mtu = new_mtu;

	return 0;
}

/**
 *  s2io_tasklet - Bottom half of the ISR.
 *  @dev_adr : address of the device structure in dma_addr_t format.
 *  Description:
 *  This is the tasklet or the bottom half of the ISR. This is
 *  an extension of the ISR which is scheduled by the scheduler to be run
 *  when the load on the CPU is low. All low priority tasks of the ISR can
 *  be pushed into the tasklet. For now the tasklet is used only to
 *  replenish the Rx buffers in the Rx buffer descriptors.
 *  Return value:
 *  void.
 */

static void s2io_tasklet(unsigned long dev_addr)
{
	struct net_device *dev = (struct net_device *) dev_addr;
	nic_t *sp = dev->priv;
	int i, ret;
	mac_info_t *mac_control;
	struct config_param *config;

	mac_control = &sp->mac_control;
	config = &sp->config;

	if (!TASKLET_IN_USE) {
		for (i = 0; i < config->rx_ring_num; i++) {
			ret = fill_rx_buffers(sp, i);
			if (ret == -ENOMEM) {
				DBG_PRINT(ERR_DBG, "%s: Out of ",
					  dev->name);
				DBG_PRINT(ERR_DBG, "memory in tasklet\n");
				break;
			} else if (ret == -EFILL) {
				DBG_PRINT(ERR_DBG,
					  "%s: Rx Ring %d is full\n",
					  dev->name, i);
				break;
			}
		}
		clear_bit(0, (&sp->tasklet_status));
	}
}

/**
 * s2io_set_link - Set the LInk status
 * @data: long pointer to device private structue
 * Description: Sets the link status for the adapter
 */

static void s2io_set_link(unsigned long data)
{
	nic_t *nic = (nic_t *) data;
	struct net_device *dev = nic->dev;
	XENA_dev_config_t __iomem *bar0 = nic->bar0;
	register u64 val64;
	u16 subid;

	if (test_and_set_bit(0, &(nic->link_state))) {
		/* The card is being reset, no point doing anything */
		return;
	}

	subid = nic->pdev->subsystem_device;
	/*
	 * Allow a small delay for the NICs self initiated
	 * cleanup to complete.
	 */
	msleep(100);

	val64 = readq(&bar0->adapter_status);
	if (verify_xena_quiescence(nic, val64, nic->device_enabled_once)) {
		if (LINK_IS_UP(val64)) {
			val64 = readq(&bar0->adapter_control);
			val64 |= ADAPTER_CNTL_EN;
			writeq(val64, &bar0->adapter_control);
			if (CARDS_WITH_FAULTY_LINK_INDICATORS(subid)) {
				val64 = readq(&bar0->gpio_control);
				val64 |= GPIO_CTRL_GPIO_0;
				writeq(val64, &bar0->gpio_control);
				val64 = readq(&bar0->gpio_control);
			} else {
				val64 |= ADAPTER_LED_ON;
				writeq(val64, &bar0->adapter_control);
			}
			val64 = readq(&bar0->adapter_status);
			if (!LINK_IS_UP(val64)) {
				DBG_PRINT(ERR_DBG, "%s:", dev->name);
				DBG_PRINT(ERR_DBG, " Link down");
				DBG_PRINT(ERR_DBG, "after ");
				DBG_PRINT(ERR_DBG, "enabling ");
				DBG_PRINT(ERR_DBG, "device \n");
			}
			if (nic->device_enabled_once == FALSE) {
				nic->device_enabled_once = TRUE;
			}
			s2io_link(nic, LINK_UP);
		} else {
			if (CARDS_WITH_FAULTY_LINK_INDICATORS(subid)) {
				val64 = readq(&bar0->gpio_control);
				val64 &= ~GPIO_CTRL_GPIO_0;
				writeq(val64, &bar0->gpio_control);
				val64 = readq(&bar0->gpio_control);
			}
			s2io_link(nic, LINK_DOWN);
		}
	} else {		/* NIC is not Quiescent. */
		DBG_PRINT(ERR_DBG, "%s: Error: ", dev->name);
		DBG_PRINT(ERR_DBG, "device is not Quiescent\n");
		netif_stop_queue(dev);
	}
	clear_bit(0, &(nic->link_state));
}

static void s2io_card_down(nic_t * sp)
{
	int cnt = 0;
	XENA_dev_config_t __iomem *bar0 = sp->bar0;
	unsigned long flags;
	register u64 val64 = 0;

	/* If s2io_set_link task is executing, wait till it completes. */
	while (test_and_set_bit(0, &(sp->link_state))) {
		msleep(50);
	}
	atomic_set(&sp->card_state, CARD_DOWN);

	/* disable Tx and Rx traffic on the NIC */
	stop_nic(sp);

	/* Kill tasklet. */
	tasklet_kill(&sp->task);

	/* Check if the device is Quiescent and then Reset the NIC */
	do {
		val64 = readq(&bar0->adapter_status);
		if (verify_xena_quiescence(sp, val64, sp->device_enabled_once)) {
			break;
		}

		msleep(50);
		cnt++;
		if (cnt == 10) {
			DBG_PRINT(ERR_DBG,
				  "s2io_close:Device not Quiescent ");
			DBG_PRINT(ERR_DBG, "adaper status reads 0x%llx\n",
				  (unsigned long long) val64);
			break;
		}
	} while (1);
	s2io_reset(sp);

	/* Waiting till all Interrupt handlers are complete */
	cnt = 0;
	do {
		msleep(10);
		if (!atomic_read(&sp->isr_cnt))
			break;
		cnt++;
	} while(cnt < 5);

	spin_lock_irqsave(&sp->tx_lock, flags);
	/* Free all Tx buffers */
	free_tx_buffers(sp);
	spin_unlock_irqrestore(&sp->tx_lock, flags);

	/* Free all Rx buffers */
	spin_lock_irqsave(&sp->rx_lock, flags);
	free_rx_buffers(sp);
	spin_unlock_irqrestore(&sp->rx_lock, flags);

	clear_bit(0, &(sp->link_state));
}

static int s2io_card_up(nic_t * sp)
{
	int i, ret;
	mac_info_t *mac_control;
	struct config_param *config;
	struct net_device *dev = (struct net_device *) sp->dev;

	/* Initialize the H/W I/O registers */
	if (init_nic(sp) != 0) {
		DBG_PRINT(ERR_DBG, "%s: H/W initialization failed\n",
			  dev->name);
		return -ENODEV;
	}

	/*
	 * Initializing the Rx buffers. For now we are considering only 1
	 * Rx ring and initializing buffers into 30 Rx blocks
	 */
	mac_control = &sp->mac_control;
	config = &sp->config;

	for (i = 0; i < config->rx_ring_num; i++) {
		if ((ret = fill_rx_buffers(sp, i))) {
			DBG_PRINT(ERR_DBG, "%s: Out of memory in Open\n",
				  dev->name);
			s2io_reset(sp);
			free_rx_buffers(sp);
			return -ENOMEM;
		}
		DBG_PRINT(INFO_DBG, "Buf in ring:%d is %d:\n", i,
			  atomic_read(&sp->rx_bufs_left[i]));
	}

	/* Setting its receive mode */
	s2io_set_multicast(dev);

	/* Enable tasklet for the device */
	tasklet_init(&sp->task, s2io_tasklet, (unsigned long) dev);

	/* Enable Rx Traffic and interrupts on the NIC */
	if (start_nic(sp)) {
		DBG_PRINT(ERR_DBG, "%s: Starting NIC failed\n", dev->name);
		tasklet_kill(&sp->task);
		s2io_reset(sp);
		free_irq(dev->irq, dev);
		free_rx_buffers(sp);
		return -ENODEV;
	}

	atomic_set(&sp->card_state, CARD_UP);
	return 0;
}

/**
 * s2io_restart_nic - Resets the NIC.
 * @data : long pointer to the device private structure
 * Description:
 * This function is scheduled to be run by the s2io_tx_watchdog
 * function after 0.5 secs to reset the NIC. The idea is to reduce
 * the run time of the watch dog routine which is run holding a
 * spin lock.
 */

static void s2io_restart_nic(unsigned long data)
{
	struct net_device *dev = (struct net_device *) data;
	nic_t *sp = dev->priv;

	s2io_card_down(sp);
	if (s2io_card_up(sp)) {
		DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",
			  dev->name);
	}
	netif_wake_queue(dev);
	DBG_PRINT(ERR_DBG, "%s: was reset by Tx watchdog timer\n",
		  dev->name);

}

/**
 *  s2io_tx_watchdog - Watchdog for transmit side.
 *  @dev : Pointer to net device structure
 *  Description:
 *  This function is triggered if the Tx Queue is stopped
 *  for a pre-defined amount of time when the Interface is still up.
 *  If the Interface is jammed in such a situation, the hardware is
 *  reset (by s2io_close) and restarted again (by s2io_open) to
 *  overcome any problem that might have been caused in the hardware.
 *  Return value:
 *  void
 */

static void s2io_tx_watchdog(struct net_device *dev)
{
	nic_t *sp = dev->priv;

	if (netif_carrier_ok(dev)) {
		schedule_work(&sp->rst_timer_task);
	}
}

/**
 *   rx_osm_handler - To perform some OS related operations on SKB.
 *   @sp: private member of the device structure,pointer to s2io_nic structure.
 *   @skb : the socket buffer pointer.
 *   @len : length of the packet
 *   @cksum : FCS checksum of the frame.
 *   @ring_no : the ring from which this RxD was extracted.
 *   Description:
 *   This function is called by the Tx interrupt serivce routine to perform
 *   some OS related operations on the SKB before passing it to the upper
 *   layers. It mainly checks if the checksum is OK, if so adds it to the
 *   SKBs cksum variable, increments the Rx packet count and passes the SKB
 *   to the upper layer. If the checksum is wrong, it increments the Rx
 *   packet error count, frees the SKB and returns error.
 *   Return value:
 *   SUCCESS on success and -1 on failure.
 */
static int rx_osm_handler(ring_info_t *ring_data, RxD_t * rxdp)
{
	nic_t *sp = ring_data->nic;
	struct net_device *dev = (struct net_device *) sp->dev;
	struct sk_buff *skb = (struct sk_buff *)
		((unsigned long) rxdp->Host_Control);
	int ring_no = ring_data->ring_no;
	u16 l3_csum, l4_csum;
#ifdef CONFIG_2BUFF_MODE
	int buf0_len = RXD_GET_BUFFER0_SIZE(rxdp->Control_2);
	int buf2_len = RXD_GET_BUFFER2_SIZE(rxdp->Control_2);
	int get_block = ring_data->rx_curr_get_info.block_index;
	int get_off = ring_data->rx_curr_get_info.offset;
	buffAdd_t *ba = &ring_data->ba[get_block][get_off];
	unsigned char *buff;
#else
	u16 len = (u16) ((RXD_GET_BUFFER0_SIZE(rxdp->Control_2)) >> 48);;
#endif
	skb->dev = dev;
	if (rxdp->Control_1 & RXD_T_CODE) {
		unsigned long long err = rxdp->Control_1 & RXD_T_CODE;
		DBG_PRINT(ERR_DBG, "%s: Rx error Value: 0x%llx\n",
			  dev->name, err);
		dev_kfree_skb(skb);
		sp->stats.rx_crc_errors++;
		atomic_dec(&sp->rx_bufs_left[ring_no]);
		rxdp->Host_Control = 0;
		return 0;
	}

	/* Updating statistics */
	rxdp->Host_Control = 0;
	sp->rx_pkt_count++;
	sp->stats.rx_packets++;
#ifndef CONFIG_2BUFF_MODE
	sp->stats.rx_bytes += len;
#else
	sp->stats.rx_bytes += buf0_len + buf2_len;
#endif

#ifndef CONFIG_2BUFF_MODE
	skb_put(skb, len);
#else
	buff = skb_push(skb, buf0_len);
	memcpy(buff, ba->ba_0, buf0_len);
	skb_put(skb, buf2_len);
#endif

	if ((rxdp->Control_1 & TCP_OR_UDP_FRAME) &&
	    (sp->rx_csum)) {
		l3_csum = RXD_GET_L3_CKSUM(rxdp->Control_1);
		l4_csum = RXD_GET_L4_CKSUM(rxdp->Control_1);
		if ((l3_csum == L3_CKSUM_OK) && (l4_csum == L4_CKSUM_OK)) {
			/*
			 * NIC verifies if the Checksum of the received
			 * frame is Ok or not and accordingly returns
			 * a flag in the RxD.
			 */
			skb->ip_summed = CHECKSUM_UNNECESSARY;
		} else {
			/*
			 * Packet with erroneous checksum, let the
			 * upper layers deal with it.
			 */
			skb->ip_summed = CHECKSUM_NONE;
		}
	} else {
		skb->ip_summed = CHECKSUM_NONE;
	}

	skb->protocol = eth_type_trans(skb, dev);
#ifdef CONFIG_S2IO_NAPI
	netif_receive_skb(skb);
#else
	netif_rx(skb);
#endif
	dev->last_rx = jiffies;
	atomic_dec(&sp->rx_bufs_left[ring_no]);
	return SUCCESS;
}

/**
 *  s2io_link - stops/starts the Tx queue.
 *  @sp : private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  @link : inidicates whether link is UP/DOWN.
 *  Description:
 *  This function stops/starts the Tx queue depending on whether the link
 *  status of the NIC is is down or up. This is called by the Alarm
 *  interrupt handler whenever a link change interrupt comes up.
 *  Return value:
 *  void.
 */

void s2io_link(nic_t * sp, int link)
{
	struct net_device *dev = (struct net_device *) sp->dev;

	if (link != sp->last_link_state) {
		if (link == LINK_DOWN) {
			DBG_PRINT(ERR_DBG, "%s: Link down\n", dev->name);
			netif_carrier_off(dev);
		} else {
			DBG_PRINT(ERR_DBG, "%s: Link Up\n", dev->name);
			netif_carrier_on(dev);
		}
	}
	sp->last_link_state = link;
}

/**
 *  get_xena_rev_id - to identify revision ID of xena.
 *  @pdev : PCI Dev structure
 *  Description:
 *  Function to identify the Revision ID of xena.
 *  Return value:
 *  returns the revision ID of the device.
 */

int get_xena_rev_id(struct pci_dev *pdev)
{
	u8 id = 0;
	int ret;
	ret = pci_read_config_byte(pdev, PCI_REVISION_ID, (u8 *) & id);
	return id;
}

/**
 *  s2io_init_pci -Initialization of PCI and PCI-X configuration registers .
 *  @sp : private member of the device structure, which is a pointer to the
 *  s2io_nic structure.
 *  Description:
 *  This function initializes a few of the PCI and PCI-X configuration registers
 *  with recommended values.
 *  Return value:
 *  void
 */

static void s2io_init_pci(nic_t * sp)
{
	u16 pci_cmd = 0, pcix_cmd = 0;

	/* Enable Data Parity Error Recovery in PCI-X command register. */
	pci_read_config_word(sp->pdev, PCIX_COMMAND_REGISTER,
			     &(pcix_cmd));
	pci_write_config_word(sp->pdev, PCIX_COMMAND_REGISTER,
			      (pcix_cmd | 1));
	pci_read_config_word(sp->pdev, PCIX_COMMAND_REGISTER,
			     &(pcix_cmd));

	/* Set the PErr Response bit in PCI command register. */
	pci_read_config_word(sp->pdev, PCI_COMMAND, &pci_cmd);
	pci_write_config_word(sp->pdev, PCI_COMMAND,
			      (pci_cmd | PCI_COMMAND_PARITY));
	pci_read_config_word(sp->pdev, PCI_COMMAND, &pci_cmd);

	/* Forcibly disabling relaxed ordering capability of the card. */
	pcix_cmd &= 0xfffd;
	pci_write_config_word(sp->pdev, PCIX_COMMAND_REGISTER,
			      pcix_cmd);
	pci_read_config_word(sp->pdev, PCIX_COMMAND_REGISTER,
			     &(pcix_cmd));
}

MODULE_AUTHOR("Raghavendra Koushik <raghavendra.koushik@neterion.com>");
MODULE_LICENSE("GPL");
module_param(tx_fifo_num, int, 0);
module_param(rx_ring_num, int, 0);
module_param_array(tx_fifo_len, uint, NULL, 0);
module_param_array(rx_ring_sz, uint, NULL, 0);
module_param_array(rts_frm_len, uint, NULL, 0);
module_param(use_continuous_tx_intrs, int, 1);
module_param(rmac_pause_time, int, 0);
module_param(mc_pause_threshold_q0q3, int, 0);
module_param(mc_pause_threshold_q4q7, int, 0);
module_param(shared_splits, int, 0);
module_param(tmac_util_period, int, 0);
module_param(rmac_util_period, int, 0);
#ifndef CONFIG_S2IO_NAPI
module_param(indicate_max_pkts, int, 0);
#endif

/**
 *  s2io_init_nic - Initialization of the adapter .
 *  @pdev : structure containing the PCI related information of the device.
 *  @pre: List of PCI devices supported by the driver listed in s2io_tbl.
 *  Description:
 *  The function initializes an adapter identified by the pci_dec structure.
 *  All OS related initialization including memory and device structure and
 *  initlaization of the device private variable is done. Also the swapper
 *  control register is initialized to enable read and write into the I/O
 *  registers of the device.
 *  Return value:
 *  returns 0 on success and negative on failure.
 */

static int __devinit
s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
{
	nic_t *sp;
	struct net_device *dev;
	int i, j, ret;
	int dma_flag = FALSE;
	u32 mac_up, mac_down;
	u64 val64 = 0, tmp64 = 0;
	XENA_dev_config_t __iomem *bar0 = NULL;
	u16 subid;
	mac_info_t *mac_control;
	struct config_param *config;

#ifdef CONFIG_S2IO_NAPI
	DBG_PRINT(ERR_DBG, "NAPI support has been enabled\n");
#endif

	if ((ret = pci_enable_device(pdev))) {
		DBG_PRINT(ERR_DBG,
			  "s2io_init_nic: pci_enable_device failed\n");
		return ret;
	}

	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
		DBG_PRINT(INIT_DBG, "s2io_init_nic: Using 64bit DMA\n");
		dma_flag = TRUE;
		if (pci_set_consistent_dma_mask
		    (pdev, DMA_64BIT_MASK)) {
			DBG_PRINT(ERR_DBG,
				  "Unable to obtain 64bit DMA for \
					consistent allocations\n");
			pci_disable_device(pdev);
			return -ENOMEM;
		}
	} else if (!pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
		DBG_PRINT(INIT_DBG, "s2io_init_nic: Using 32bit DMA\n");
	} else {
		pci_disable_device(pdev);
		return -ENOMEM;
	}

	if (pci_request_regions(pdev, s2io_driver_name)) {
		DBG_PRINT(ERR_DBG, "Request Regions failed\n"),
		    pci_disable_device(pdev);
		return -ENODEV;
	}

	dev = alloc_etherdev(sizeof(nic_t));
	if (dev == NULL) {
		DBG_PRINT(ERR_DBG, "Device allocation failed\n");
		pci_disable_device(pdev);
		pci_release_regions(pdev);
		return -ENODEV;
	}

	pci_set_master(pdev);
	pci_set_drvdata(pdev, dev);
	SET_MODULE_OWNER(dev);
	SET_NETDEV_DEV(dev, &pdev->dev);

	/*  Private member variable initialized to s2io NIC structure */
	sp = dev->priv;
	memset(sp, 0, sizeof(nic_t));
	sp->dev = dev;
	sp->pdev = pdev;
	sp->high_dma_flag = dma_flag;
	sp->device_enabled_once = FALSE;

	/* Initialize some PCI/PCI-X fields of the NIC. */
	s2io_init_pci(sp);

	/*
	 * Setting the device configuration parameters.
	 * Most of these parameters can be specified by the user during
	 * module insertion as they are module loadable parameters. If
	 * these parameters are not not specified during load time, they
	 * are initialized with default values.
	 */
	mac_control = &sp->mac_control;
	config = &sp->config;

	/* Tx side parameters. */
	tx_fifo_len[0] = DEFAULT_FIFO_LEN;	/* Default value. */
	config->tx_fifo_num = tx_fifo_num;
	for (i = 0; i < MAX_TX_FIFOS; i++) {
		config->tx_cfg[i].fifo_len = tx_fifo_len[i];
		config->tx_cfg[i].fifo_priority = i;
	}

	/* mapping the QoS priority to the configured fifos */
	for (i = 0; i < MAX_TX_FIFOS; i++)
		config->fifo_mapping[i] = fifo_map[config->tx_fifo_num][i];

	config->tx_intr_type = TXD_INT_TYPE_UTILZ;
	for (i = 0; i < config->tx_fifo_num; i++) {
		config->tx_cfg[i].f_no_snoop =
		    (NO_SNOOP_TXD | NO_SNOOP_TXD_BUFFER);
		if (config->tx_cfg[i].fifo_len < 65) {
			config->tx_intr_type = TXD_INT_TYPE_PER_LIST;
			break;
		}
	}
	config->max_txds = MAX_SKB_FRAGS;

	/* Rx side parameters. */
	rx_ring_sz[0] = SMALL_BLK_CNT;	/* Default value. */
	config->rx_ring_num = rx_ring_num;
	for (i = 0; i < MAX_RX_RINGS; i++) {
		config->rx_cfg[i].num_rxd = rx_ring_sz[i] *
		    (MAX_RXDS_PER_BLOCK + 1);
		config->rx_cfg[i].ring_priority = i;
	}

	for (i = 0; i < rx_ring_num; i++) {
		config->rx_cfg[i].ring_org = RING_ORG_BUFF1;
		config->rx_cfg[i].f_no_snoop =
		    (NO_SNOOP_RXD | NO_SNOOP_RXD_BUFFER);
	}

	/*  Setting Mac Control parameters */
	mac_control->rmac_pause_time = rmac_pause_time;
	mac_control->mc_pause_threshold_q0q3 = mc_pause_threshold_q0q3;
	mac_control->mc_pause_threshold_q4q7 = mc_pause_threshold_q4q7;


	/* Initialize Ring buffer parameters. */
	for (i = 0; i < config->rx_ring_num; i++)
		atomic_set(&sp->rx_bufs_left[i], 0);

	/* Initialize the number of ISRs currently running */
	atomic_set(&sp->isr_cnt, 0);

	/*  initialize the shared memory used by the NIC and the host */
	if (init_shared_mem(sp)) {
		DBG_PRINT(ERR_DBG, "%s: Memory allocation failed\n",
			  dev->name);
		ret = -ENOMEM;
		goto mem_alloc_failed;
	}

	sp->bar0 = ioremap(pci_resource_start(pdev, 0),
				     pci_resource_len(pdev, 0));
	if (!sp->bar0) {
		DBG_PRINT(ERR_DBG, "%s: S2IO: cannot remap io mem1\n",
			  dev->name);
		ret = -ENOMEM;
		goto bar0_remap_failed;
	}

	sp->bar1 = ioremap(pci_resource_start(pdev, 2),
				     pci_resource_len(pdev, 2));
	if (!sp->bar1) {
		DBG_PRINT(ERR_DBG, "%s: S2IO: cannot remap io mem2\n",
			  dev->name);
		ret = -ENOMEM;
		goto bar1_remap_failed;
	}

	dev->irq = pdev->irq;
	dev->base_addr = (unsigned long) sp->bar0;

	/* Initializing the BAR1 address as the start of the FIFO pointer. */
	for (j = 0; j < MAX_TX_FIFOS; j++) {
		mac_control->tx_FIFO_start[j] = (TxFIFO_element_t __iomem *)
		    (sp->bar1 + (j * 0x00020000));
	}

	/*  Driver entry points */
	dev->open = &s2io_open;
	dev->stop = &s2io_close;
	dev->hard_start_xmit = &s2io_xmit;
	dev->get_stats = &s2io_get_stats;
	dev->set_multicast_list = &s2io_set_multicast;
	dev->do_ioctl = &s2io_ioctl;
	dev->change_mtu = &s2io_change_mtu;
	SET_ETHTOOL_OPS(dev, &netdev_ethtool_ops);

	/*
	 * will use eth_mac_addr() for  dev->set_mac_address
	 * mac address will be set every time dev->open() is called
	 */
#if defined(CONFIG_S2IO_NAPI)
	dev->poll = s2io_poll;
	dev->weight = 32;
#endif

	dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
	if (sp->high_dma_flag == TRUE)
		dev->features |= NETIF_F_HIGHDMA;
#ifdef NETIF_F_TSO
	dev->features |= NETIF_F_TSO;
#endif

	dev->tx_timeout = &s2io_tx_watchdog;
	dev->watchdog_timeo = WATCH_DOG_TIMEOUT;
	INIT_WORK(&sp->rst_timer_task,
		  (void (*)(void *)) s2io_restart_nic, dev);
	INIT_WORK(&sp->set_link_task,
		  (void (*)(void *)) s2io_set_link, sp);

	pci_save_state(sp->pdev);

	/* Setting swapper control on the NIC, for proper reset operation */
	if (s2io_set_swapper(sp)) {
		DBG_PRINT(ERR_DBG, "%s:swapper settings are wrong\n",
			  dev->name);
		ret = -EAGAIN;
		goto set_swap_failed;
	}

	/*
	 * Fix for all "FFs" MAC address problems observed on
	 * Alpha platforms
	 */
	fix_mac_address(sp);
	s2io_reset(sp);

	/*
	 * MAC address initialization.
	 * For now only one mac address will be read and used.
	 */
	bar0 = sp->bar0;
	val64 = RMAC_ADDR_CMD_MEM_RD | RMAC_ADDR_CMD_MEM_STROBE_NEW_CMD |
	    RMAC_ADDR_CMD_MEM_OFFSET(0 + MAC_MAC_ADDR_START_OFFSET);
	writeq(val64, &bar0->rmac_addr_cmd_mem);
	wait_for_cmd_complete(sp);

	tmp64 = readq(&bar0->rmac_addr_data0_mem);
	mac_down = (u32) tmp64;
	mac_up = (u32) (tmp64 >> 32);

	memset(sp->def_mac_addr[0].mac_addr, 0, sizeof(ETH_ALEN));

	sp->def_mac_addr[0].mac_addr[3] = (u8) (mac_up);
	sp->def_mac_addr[0].mac_addr[2] = (u8) (mac_up >> 8);
	sp->def_mac_addr[0].mac_addr[1] = (u8) (mac_up >> 16);
	sp->def_mac_addr[0].mac_addr[0] = (u8) (mac_up >> 24);
	sp->def_mac_addr[0].mac_addr[5] = (u8) (mac_down >> 16);
	sp->def_mac_addr[0].mac_addr[4] = (u8) (mac_down >> 24);

	DBG_PRINT(INIT_DBG,
		  "DEFAULT MAC ADDR:0x%02x-%02x-%02x-%02x-%02x-%02x\n",
		  sp->def_mac_addr[0].mac_addr[0],
		  sp->def_mac_addr[0].mac_addr[1],
		  sp->def_mac_addr[0].mac_addr[2],
		  sp->def_mac_addr[0].mac_addr[3],
		  sp->def_mac_addr[0].mac_addr[4],
		  sp->def_mac_addr[0].mac_addr[5]);

	/*  Set the factory defined MAC address initially   */
	dev->addr_len = ETH_ALEN;
	memcpy(dev->dev_addr, sp->def_mac_addr, ETH_ALEN);

	/*
	 * Initialize the tasklet status and link state flags
	 * and the card statte parameter
	 */
	atomic_set(&(sp->card_state), 0);
	sp->tasklet_status = 0;
	sp->link_state = 0;

	/* Initialize spinlocks */
	spin_lock_init(&sp->tx_lock);
#ifndef CONFIG_S2IO_NAPI
	spin_lock_init(&sp->put_lock);
#endif
	spin_lock_init(&sp->rx_lock);

	/*
	 * SXE-002: Configure link and activity LED to init state
	 * on driver load.
	 */
	subid = sp->pdev->subsystem_device;
	if ((subid & 0xFF) >= 0x07) {
		val64 = readq(&bar0->gpio_control);
		val64 |= 0x0000800000000000ULL;
		writeq(val64, &bar0->gpio_control);
		val64 = 0x0411040400000000ULL;
		writeq(val64, (void __iomem *) bar0 + 0x2700);
		val64 = readq(&bar0->gpio_control);
	}

	sp->rx_csum = 1;	/* Rx chksum verify enabled by default */

	if (register_netdev(dev)) {
		DBG_PRINT(ERR_DBG, "Device registration failed\n");
		ret = -ENODEV;
		goto register_failed;
	}

	/* Initialize device name */
	strcpy(sp->name, dev->name);
	strcat(sp->name, ": Neterion Xframe I 10GbE adapter");

	/*
	 * Make Link state as off at this point, when the Link change
	 * interrupt comes the state will be automatically changed to
	 * the right state.
	 */
	netif_carrier_off(dev);

	return 0;

      register_failed:
      set_swap_failed:
	iounmap(sp->bar1);
      bar1_remap_failed:
	iounmap(sp->bar0);
      bar0_remap_failed:
      mem_alloc_failed:
	free_shared_mem(sp);
	pci_disable_device(pdev);
	pci_release_regions(pdev);
	pci_set_drvdata(pdev, NULL);
	free_netdev(dev);

	return ret;
}

/**
 * s2io_rem_nic - Free the PCI device
 * @pdev: structure containing the PCI related information of the device.
 * Description: This function is called by the Pci subsystem to release a
 * PCI device and free up all resource held up by the device. This could
 * be in response to a Hot plug event or when the driver is to be removed
 * from memory.
 */

static void __devexit s2io_rem_nic(struct pci_dev *pdev)
{
	struct net_device *dev =
	    (struct net_device *) pci_get_drvdata(pdev);
	nic_t *sp;

	if (dev == NULL) {
		DBG_PRINT(ERR_DBG, "Driver Data is NULL!!\n");
		return;
	}

	sp = dev->priv;
	unregister_netdev(dev);

	free_shared_mem(sp);
	iounmap(sp->bar0);
	iounmap(sp->bar1);
	pci_disable_device(pdev);
	pci_release_regions(pdev);
	pci_set_drvdata(pdev, NULL);
	free_netdev(dev);
}

/**
 * s2io_starter - Entry point for the driver
 * Description: This function is the entry point for the driver. It verifies
 * the module loadable parameters and initializes PCI configuration space.
 */

int __init s2io_starter(void)
{
	return pci_module_init(&s2io_driver);
}

/**
 * s2io_closer - Cleanup routine for the driver
 * Description: This function is the cleanup routine for the driver. It unregist * ers the driver.
 */

void s2io_closer(void)
{
	pci_unregister_driver(&s2io_driver);
	DBG_PRINT(INIT_DBG, "cleanup done\n");
}

module_init(s2io_starter);
module_exit(s2io_closer);