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// SPDX-License-Identifier: GPL-2.0
/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2012 Intel Corporation.

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "ixgbe.h"
#include "kcompat.h"

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,8) )
/* From lib/vsprintf.c */
#include <asm/div64.h>

static int skip_atoi(const char **s)
{
	int i=0;

	while (isdigit(**s))
		i = i*10 + *((*s)++) - '0';
	return i;
}

#define _kc_ZEROPAD	1		/* pad with zero */
#define _kc_SIGN	2		/* unsigned/signed long */
#define _kc_PLUS	4		/* show plus */
#define _kc_SPACE	8		/* space if plus */
#define _kc_LEFT	16		/* left justified */
#define _kc_SPECIAL	32		/* 0x */
#define _kc_LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */

static char * number(char * buf, char * end, long long num, int base, int size, int precision, int type)
{
	char c,sign,tmp[66];
	const char *digits;
	const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
	const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	int i;

	digits = (type & _kc_LARGE) ? large_digits : small_digits;
	if (type & _kc_LEFT)
		type &= ~_kc_ZEROPAD;
	if (base < 2 || base > 36)
		return 0;
	c = (type & _kc_ZEROPAD) ? '0' : ' ';
	sign = 0;
	if (type & _kc_SIGN) {
		if (num < 0) {
			sign = '-';
			num = -num;
			size--;
		} else if (type & _kc_PLUS) {
			sign = '+';
			size--;
		} else if (type & _kc_SPACE) {
			sign = ' ';
			size--;
		}
	}
	if (type & _kc_SPECIAL) {
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}
	i = 0;
	if (num == 0)
		tmp[i++]='0';
	else while (num != 0)
		tmp[i++] = digits[do_div(num,base)];
	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type&(_kc_ZEROPAD+_kc_LEFT))) {
		while(size-->0) {
			if (buf <= end)
				*buf = ' ';
			++buf;
		}
	}
	if (sign) {
		if (buf <= end)
			*buf = sign;
		++buf;
	}
	if (type & _kc_SPECIAL) {
		if (base==8) {
			if (buf <= end)
				*buf = '0';
			++buf;
		} else if (base==16) {
			if (buf <= end)
				*buf = '0';
			++buf;
			if (buf <= end)
				*buf = digits[33];
			++buf;
		}
	}
	if (!(type & _kc_LEFT)) {
		while (size-- > 0) {
			if (buf <= end)
				*buf = c;
			++buf;
		}
	}
	while (i < precision--) {
		if (buf <= end)
			*buf = '0';
		++buf;
	}
	while (i-- > 0) {
		if (buf <= end)
			*buf = tmp[i];
		++buf;
	}
	while (size-- > 0) {
		if (buf <= end)
			*buf = ' ';
		++buf;
	}
	return buf;
}

int _kc_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
	int len;
	unsigned long long num;
	int i, base;
	char *str, *end, c;
	const char *s;

	int flags;		/* flags to number() */

	int field_width;	/* width of output field */
	int precision;		/* min. # of digits for integers; max
				   number of chars for from string */
	int qualifier;		/* 'h', 'l', or 'L' for integer fields */
				/* 'z' support added 23/7/1999 S.H.    */
				/* 'z' changed to 'Z' --davidm 1/25/99 */

	str = buf;
	end = buf + size - 1;

	if (end < buf - 1) {
		end = ((void *) -1);
		size = end - buf + 1;
	}

	for (; *fmt ; ++fmt) {
		if (*fmt != '%') {
			if (str <= end)
				*str = *fmt;
			++str;
			continue;
		}

		/* process flags */
		flags = 0;
		repeat:
			++fmt;		/* this also skips first '%' */
			switch (*fmt) {
				case '-': flags |= _kc_LEFT; goto repeat;
				case '+': flags |= _kc_PLUS; goto repeat;
				case ' ': flags |= _kc_SPACE; goto repeat;
				case '#': flags |= _kc_SPECIAL; goto repeat;
				case '0': flags |= _kc_ZEROPAD; goto repeat;
			}

		/* get field width */
		field_width = -1;
		if (isdigit(*fmt))
			field_width = skip_atoi(&fmt);
		else if (*fmt == '*') {
			++fmt;
			/* it's the next argument */
			field_width = va_arg(args, int);
			if (field_width < 0) {
				field_width = -field_width;
				flags |= _kc_LEFT;
			}
		}

		/* get the precision */
		precision = -1;
		if (*fmt == '.') {
			++fmt;
			if (isdigit(*fmt))
				precision = skip_atoi(&fmt);
			else if (*fmt == '*') {
				++fmt;
				/* it's the next argument */
				precision = va_arg(args, int);
			}
			if (precision < 0)
				precision = 0;
		}

		/* get the conversion qualifier */
		qualifier = -1;
		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt =='Z') {
			qualifier = *fmt;
			++fmt;
		}

		/* default base */
		base = 10;

		switch (*fmt) {
			case 'c':
				if (!(flags & _kc_LEFT)) {
					while (--field_width > 0) {
						if (str <= end)
							*str = ' ';
						++str;
					}
				}
				c = (unsigned char) va_arg(args, int);
				if (str <= end)
					*str = c;
				++str;
				while (--field_width > 0) {
					if (str <= end)
						*str = ' ';
					++str;
				}
				continue;

			case 's':
				s = va_arg(args, char *);
				if (!s)
					s = "<NULL>";

				len = strnlen(s, precision);

				if (!(flags & _kc_LEFT)) {
					while (len < field_width--) {
						if (str <= end)
							*str = ' ';
						++str;
					}
				}
				for (i = 0; i < len; ++i) {
					if (str <= end)
						*str = *s;
					++str; ++s;
				}
				while (len < field_width--) {
					if (str <= end)
						*str = ' ';
					++str;
				}
				continue;

			case 'p':
				if (field_width == -1) {
					field_width = 2*sizeof(void *);
					flags |= _kc_ZEROPAD;
				}
				str = number(str, end,
						(unsigned long) va_arg(args, void *),
						16, field_width, precision, flags);
				continue;


			case 'n':
				/* FIXME:
				* What does C99 say about the overflow case here? */
				if (qualifier == 'l') {
					long * ip = va_arg(args, long *);
					*ip = (str - buf);
				} else if (qualifier == 'Z') {
					size_t * ip = va_arg(args, size_t *);
					*ip = (str - buf);
				} else {
					int * ip = va_arg(args, int *);
					*ip = (str - buf);
				}
				continue;

			case '%':
				if (str <= end)
					*str = '%';
				++str;
				continue;

				/* integer number formats - set up the flags and "break" */
			case 'o':
				base = 8;
				break;

			case 'X':
				flags |= _kc_LARGE;
			case 'x':
				base = 16;
				break;

			case 'd':
			case 'i':
				flags |= _kc_SIGN;
			case 'u':
				break;

			default:
				if (str <= end)
					*str = '%';
				++str;
				if (*fmt) {
					if (str <= end)
						*str = *fmt;
					++str;
				} else {
					--fmt;
				}
				continue;
		}
		if (qualifier == 'L')
			num = va_arg(args, long long);
		else if (qualifier == 'l') {
			num = va_arg(args, unsigned long);
			if (flags & _kc_SIGN)
				num = (signed long) num;
		} else if (qualifier == 'Z') {
			num = va_arg(args, size_t);
		} else if (qualifier == 'h') {
			num = (unsigned short) va_arg(args, int);
			if (flags & _kc_SIGN)
				num = (signed short) num;
		} else {
			num = va_arg(args, unsigned int);
			if (flags & _kc_SIGN)
				num = (signed int) num;
		}
		str = number(str, end, num, base,
				field_width, precision, flags);
	}
	if (str <= end)
		*str = '\0';
	else if (size > 0)
		/* don't write out a null byte if the buf size is zero */
		*end = '\0';
	/* the trailing null byte doesn't count towards the total
	* ++str;
	*/
	return str-buf;
}

int _kc_snprintf(char * buf, size_t size, const char *fmt, ...)
{
	va_list args;
	int i;

	va_start(args, fmt);
	i = _kc_vsnprintf(buf,size,fmt,args);
	va_end(args);
	return i;
}
#endif /* < 2.4.8 */



#if ( LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0) )
#ifdef CONFIG_PCI_IOV
int __kc_pci_vfs_assigned(struct pci_dev *dev)
{
        unsigned int vfs_assigned = 0;
#ifdef HAVE_PCI_DEV_FLAGS_ASSIGNED
        int pos;
        struct pci_dev *vfdev;
        unsigned short dev_id;

        /* only search if we are a PF */
        if (!dev->is_physfn)
                return 0;

        /* find SR-IOV capability */
        pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
        if (!pos)
                return 0;

        /*
 *          * determine the device ID for the VFs, the vendor ID will be the
 *                   * same as the PF so there is no need to check for that one
 *                            */
        pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &dev_id);

        /* loop through all the VFs to see if we own any that are assigned */
       vfdev = pci_get_device(dev->vendor, dev_id, NULL);
        while (vfdev) {
                /*
 *                  * It is considered assigned if it is a virtual function with
 *                                   * our dev as the physical function and the assigned bit is set
 *                                                    */
               if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
                   (vfdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED))
                       vfs_assigned++;

               vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
       }

#endif /* HAVE_PCI_DEV_FLAGS_ASSIGNED */
        return vfs_assigned;
}

#endif /* CONFIG_PCI_IOV */
#endif /* 3.10.0 */



/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,13) )

/**************************************/
/* PCI DMA MAPPING */

#if defined(CONFIG_HIGHMEM)

#ifndef PCI_DRAM_OFFSET
#define PCI_DRAM_OFFSET 0
#endif

u64
_kc_pci_map_page(struct pci_dev *dev, struct page *page, unsigned long offset,
                 size_t size, int direction)
{
	return ((u64) (page - mem_map) << PAGE_SHIFT) + offset +
		PCI_DRAM_OFFSET;
}

#else /* CONFIG_HIGHMEM */

u64
_kc_pci_map_page(struct pci_dev *dev, struct page *page, unsigned long offset,
                 size_t size, int direction)
{
	return pci_map_single(dev, (void *)page_address(page) + offset, size,
			      direction);
}

#endif /* CONFIG_HIGHMEM */

void
_kc_pci_unmap_page(struct pci_dev *dev, u64 dma_addr, size_t size,
                   int direction)
{
	return pci_unmap_single(dev, dma_addr, size, direction);
}

#endif /* 2.4.13 => 2.4.3 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,3) )

/**************************************/
/* PCI DRIVER API */

int
_kc_pci_set_dma_mask(struct pci_dev *dev, dma_addr_t mask)
{
	if (!pci_dma_supported(dev, mask))
		return -EIO;
	dev->dma_mask = mask;
	return 0;
}

int
_kc_pci_request_regions(struct pci_dev *dev, char *res_name)
{
	int i;

	for (i = 0; i < 6; i++) {
		if (pci_resource_len(dev, i) == 0)
			continue;

		if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
			if (!request_region(pci_resource_start(dev, i), pci_resource_len(dev, i), res_name)) {
				pci_release_regions(dev);
				return -EBUSY;
			}
		} else if (pci_resource_flags(dev, i) & IORESOURCE_MEM) {
			if (!request_mem_region(pci_resource_start(dev, i), pci_resource_len(dev, i), res_name)) {
				pci_release_regions(dev);
				return -EBUSY;
			}
		}
	}
	return 0;
}

void
_kc_pci_release_regions(struct pci_dev *dev)
{
	int i;

	for (i = 0; i < 6; i++) {
		if (pci_resource_len(dev, i) == 0)
			continue;

		if (pci_resource_flags(dev, i) & IORESOURCE_IO)
			release_region(pci_resource_start(dev, i), pci_resource_len(dev, i));

		else if (pci_resource_flags(dev, i) & IORESOURCE_MEM)
			release_mem_region(pci_resource_start(dev, i), pci_resource_len(dev, i));
	}
}

/**************************************/
/* NETWORK DRIVER API */

struct net_device *
_kc_alloc_etherdev(int sizeof_priv)
{
	struct net_device *dev;
	int alloc_size;

	alloc_size = sizeof(*dev) + sizeof_priv + IFNAMSIZ + 31;
	dev = kzalloc(alloc_size, GFP_KERNEL);
	if (!dev)
		return NULL;

	if (sizeof_priv)
		dev->priv = (void *) (((unsigned long)(dev + 1) + 31) & ~31);
	dev->name[0] = '\0';
	ether_setup(dev);

	return dev;
}

int
_kc_is_valid_ether_addr(u8 *addr)
{
	const char zaddr[6] = { 0, };

	return !(addr[0] & 1) && memcmp(addr, zaddr, 6);
}

#endif /* 2.4.3 => 2.4.0 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,6) )

int
_kc_pci_set_power_state(struct pci_dev *dev, int state)
{
	return 0;
}

int
_kc_pci_enable_wake(struct pci_dev *pdev, u32 state, int enable)
{
	return 0;
}

#endif /* 2.4.6 => 2.4.3 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) )
void _kc_skb_fill_page_desc(struct sk_buff *skb, int i, struct page *page,
                            int off, int size)
{
	skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
	frag->page = page;
	frag->page_offset = off;
	frag->size = size;
	skb_shinfo(skb)->nr_frags = i + 1;
}

/*
 * Original Copyright:
 * find_next_bit.c: fallback find next bit implementation
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

/**
 * find_next_bit - find the next set bit in a memory region
 * @addr: The address to base the search on
 * @offset: The bitnumber to start searching at
 * @size: The maximum size to search
 */
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
                            unsigned long offset)
{
	const unsigned long *p = addr + BITOP_WORD(offset);
	unsigned long result = offset & ~(BITS_PER_LONG-1);
	unsigned long tmp;

	if (offset >= size)
		return size;
	size -= result;
	offset %= BITS_PER_LONG;
	if (offset) {
		tmp = *(p++);
		tmp &= (~0UL << offset);
		if (size < BITS_PER_LONG)
			goto found_first;
		if (tmp)
			goto found_middle;
		size -= BITS_PER_LONG;
		result += BITS_PER_LONG;
	}
	while (size & ~(BITS_PER_LONG-1)) {
		if ((tmp = *(p++)))
			goto found_middle;
		result += BITS_PER_LONG;
		size -= BITS_PER_LONG;
	}
	if (!size)
		return result;
	tmp = *p;

found_first:
	tmp &= (~0UL >> (BITS_PER_LONG - size));
	if (tmp == 0UL)		/* Are any bits set? */
		return result + size;	/* Nope. */
found_middle:
	return result + ffs(tmp);
}

size_t _kc_strlcpy(char *dest, const char *src, size_t size)
{
	size_t ret = strlen(src);

	if (size) {
		size_t len = (ret >= size) ? size - 1 : ret;
		memcpy(dest, src, len);
		dest[len] = '\0';
	}
	return ret;
}

#endif /* 2.6.0 => 2.4.6 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4) )
int _kc_scnprintf(char * buf, size_t size, const char *fmt, ...)
{
	va_list args;
	int i;

	va_start(args, fmt);
	i = vsnprintf(buf, size, fmt, args);
	va_end(args);
	return (i >= size) ? (size - 1) : i;
}
#endif /* < 2.6.4 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10) )
DECLARE_BITMAP(_kcompat_node_online_map, MAX_NUMNODES) = {1};
#endif /* < 2.6.10 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13) )
char *_kc_kstrdup(const char *s, unsigned int gfp)
{
	size_t len;
	char *buf;

	if (!s)
		return NULL;

	len = strlen(s) + 1;
	buf = kmalloc(len, gfp);
	if (buf)
		memcpy(buf, s, len);
	return buf;
}
#endif /* < 2.6.13 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14) )
void *_kc_kzalloc(size_t size, int flags)
{
	void *ret = kmalloc(size, flags);
	if (ret)
		memset(ret, 0, size);
	return ret;
}
#endif /* <= 2.6.13 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) )
int _kc_skb_pad(struct sk_buff *skb, int pad)
{
	int ntail;

        /* If the skbuff is non linear tailroom is always zero.. */
        if(!skb_cloned(skb) && skb_tailroom(skb) >= pad) {
		memset(skb->data+skb->len, 0, pad);
		return 0;
        }

	ntail = skb->data_len + pad - (skb->end - skb->tail);
	if (likely(skb_cloned(skb) || ntail > 0)) {
		if (pskb_expand_head(skb, 0, ntail, GFP_ATOMIC));
			goto free_skb;
	}

#ifdef MAX_SKB_FRAGS
	if (skb_is_nonlinear(skb) &&
	    !__pskb_pull_tail(skb, skb->data_len))
		goto free_skb;

#endif
	memset(skb->data + skb->len, 0, pad);
        return 0;

free_skb:
	kfree_skb(skb);
	return -ENOMEM;
}

#if (!(RHEL_RELEASE_CODE && RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5,4)))
int _kc_pci_save_state(struct pci_dev *pdev)
{
	struct adapter_struct *adapter = pci_get_drvdata(pdev);
	int size = PCI_CONFIG_SPACE_LEN, i;
	u16 pcie_cap_offset, pcie_link_status;

#if ( LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) )
	/* no ->dev for 2.4 kernels */
	WARN_ON(pdev->dev.driver_data == NULL);
#endif
	pcie_cap_offset = pci_find_capability(pdev, PCI_CAP_ID_EXP);
	if (pcie_cap_offset) {
		if (!pci_read_config_word(pdev,
		                          pcie_cap_offset + PCIE_LINK_STATUS,
		                          &pcie_link_status))
		size = PCIE_CONFIG_SPACE_LEN;
	}
	pci_config_space_ich8lan();
#ifdef HAVE_PCI_ERS
	if (adapter->config_space == NULL)
#else
	WARN_ON(adapter->config_space != NULL);
#endif
		adapter->config_space = kmalloc(size, GFP_KERNEL);
	if (!adapter->config_space) {
		printk(KERN_ERR "Out of memory in pci_save_state\n");
		return -ENOMEM;
	}
	for (i = 0; i < (size / 4); i++)
		pci_read_config_dword(pdev, i * 4, &adapter->config_space[i]);
	return 0;
}

void _kc_pci_restore_state(struct pci_dev *pdev)
{
	struct adapter_struct *adapter = pci_get_drvdata(pdev);
	int size = PCI_CONFIG_SPACE_LEN, i;
	u16 pcie_cap_offset;
	u16 pcie_link_status;

	if (adapter->config_space != NULL) {
		pcie_cap_offset = pci_find_capability(pdev, PCI_CAP_ID_EXP);
		if (pcie_cap_offset &&
		    !pci_read_config_word(pdev,
		                          pcie_cap_offset + PCIE_LINK_STATUS,
		                          &pcie_link_status))
			size = PCIE_CONFIG_SPACE_LEN;

		pci_config_space_ich8lan();
		for (i = 0; i < (size / 4); i++)
		pci_write_config_dword(pdev, i * 4, adapter->config_space[i]);
#ifndef HAVE_PCI_ERS
		kfree(adapter->config_space);
		adapter->config_space = NULL;
#endif
	}
}
#endif /* !(RHEL_RELEASE_CODE >= RHEL 5.4) */

#ifdef HAVE_PCI_ERS
void _kc_free_netdev(struct net_device *netdev)
{
	struct adapter_struct *adapter = netdev_priv(netdev);

	if (adapter->config_space != NULL)
		kfree(adapter->config_space);
#ifdef CONFIG_SYSFS
	if (netdev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)netdev - netdev->padded);
	} else {
		BUG_ON(netdev->reg_state != NETREG_UNREGISTERED);
		netdev->reg_state = NETREG_RELEASED;
		class_device_put(&netdev->class_dev);
	}
#else
	kfree((char *)netdev - netdev->padded);
#endif
}
#endif

void *_kc_kmemdup(const void *src, size_t len, unsigned gfp)
{
	void *p;

	p = kzalloc(len, gfp);
	if (p)
		memcpy(p, src, len);
	return p;
}
#endif /* <= 2.6.19 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22) )
/* hexdump code taken from lib/hexdump.c */
static void _kc_hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
			int groupsize, unsigned char *linebuf,
			size_t linebuflen, bool ascii)
{
	const u8 *ptr = buf;
	u8 ch;
	int j, lx = 0;
	int ascii_column;

	if (rowsize != 16 && rowsize != 32)
		rowsize = 16;

	if (!len)
		goto nil;
	if (len > rowsize)		/* limit to one line at a time */
		len = rowsize;
	if ((len % groupsize) != 0)	/* no mixed size output */
		groupsize = 1;

	switch (groupsize) {
	case 8: {
		const u64 *ptr8 = buf;
		int ngroups = len / groupsize;

		for (j = 0; j < ngroups; j++)
			lx += scnprintf((char *)(linebuf + lx), linebuflen - lx,
				"%s%16.16llx", j ? " " : "",
				(unsigned long long)*(ptr8 + j));
		ascii_column = 17 * ngroups + 2;
		break;
	}

	case 4: {
		const u32 *ptr4 = buf;
		int ngroups = len / groupsize;

		for (j = 0; j < ngroups; j++)
			lx += scnprintf((char *)(linebuf + lx), linebuflen - lx,
				"%s%8.8x", j ? " " : "", *(ptr4 + j));
		ascii_column = 9 * ngroups + 2;
		break;
	}

	case 2: {
		const u16 *ptr2 = buf;
		int ngroups = len / groupsize;

		for (j = 0; j < ngroups; j++)
			lx += scnprintf((char *)(linebuf + lx), linebuflen - lx,
				"%s%4.4x", j ? " " : "", *(ptr2 + j));
		ascii_column = 5 * ngroups + 2;
		break;
	}

	default:
		for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) {
			ch = ptr[j];
			linebuf[lx++] = hex_asc(ch >> 4);
			linebuf[lx++] = hex_asc(ch & 0x0f);
			linebuf[lx++] = ' ';
		}
		if (j)
			lx--;

		ascii_column = 3 * rowsize + 2;
		break;
	}
	if (!ascii)
		goto nil;

	while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
		linebuf[lx++] = ' ';
	for (j = 0; (j < len) && (lx + 2) < linebuflen; j++)
		linebuf[lx++] = (isascii(ptr[j]) && isprint(ptr[j])) ? ptr[j]
				: '.';
nil:
	linebuf[lx++] = '\0';
}

void _kc_print_hex_dump(const char *level,
			const char *prefix_str, int prefix_type,
			int rowsize, int groupsize,
			const void *buf, size_t len, bool ascii)
{
	const u8 *ptr = buf;
	int i, linelen, remaining = len;
	unsigned char linebuf[200];

	if (rowsize != 16 && rowsize != 32)
		rowsize = 16;

	for (i = 0; i < len; i += rowsize) {
		linelen = min(remaining, rowsize);
		remaining -= rowsize;
		_kc_hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
				linebuf, sizeof(linebuf), ascii);

		switch (prefix_type) {
		case DUMP_PREFIX_ADDRESS:
			printk("%s%s%*p: %s\n", level, prefix_str,
				(int)(2 * sizeof(void *)), ptr + i, linebuf);
			break;
		case DUMP_PREFIX_OFFSET:
			printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
			break;
		default:
			printk("%s%s%s\n", level, prefix_str, linebuf);
			break;
		}
	}
}
#endif /* < 2.6.22 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) )
int ixgbe_dcb_netlink_register(void)
{
	return 0;
}

int ixgbe_dcb_netlink_unregister(void)
{
	return 0;
}

int ixgbe_copy_dcb_cfg(struct ixgbe_adapter *adapter, int tc_max)
{
	return 0;
}
#endif /* < 2.6.23 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) )
#ifdef NAPI
struct net_device *napi_to_poll_dev(struct napi_struct *napi)
{
	struct adapter_q_vector *q_vector = container_of(napi,
	                                                struct adapter_q_vector,
	                                                napi);
	return &q_vector->poll_dev;
}

int __kc_adapter_clean(struct net_device *netdev, int *budget)
{
	int work_done;
	int work_to_do = min(*budget, netdev->quota);
	/* kcompat.h netif_napi_add puts napi struct in "fake netdev->priv" */
	struct napi_struct *napi = netdev->priv;
	work_done = napi->poll(napi, work_to_do);
	*budget -= work_done;
	netdev->quota -= work_done;
	return (work_done >= work_to_do) ? 1 : 0;
}
#endif /* NAPI */
#endif /* <= 2.6.24 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) )
void _kc_pci_disable_link_state(struct pci_dev *pdev, int state)
{
	struct pci_dev *parent = pdev->bus->self;
	u16 link_state;
	int pos;

	if (!parent)
		return;

	pos = pci_find_capability(parent, PCI_CAP_ID_EXP);
	if (pos) {
		pci_read_config_word(parent, pos + PCI_EXP_LNKCTL, &link_state);
		link_state &= ~state;
		pci_write_config_word(parent, pos + PCI_EXP_LNKCTL, link_state);
	}
}
#endif /* < 2.6.26 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27) )
#ifdef HAVE_TX_MQ
void _kc_netif_tx_stop_all_queues(struct net_device *netdev)
{
	struct adapter_struct *adapter = netdev_priv(netdev);
	int i;

	netif_stop_queue(netdev);
	if (netif_is_multiqueue(netdev))
		for (i = 0; i < adapter->num_tx_queues; i++)
			netif_stop_subqueue(netdev, i);
}
void _kc_netif_tx_wake_all_queues(struct net_device *netdev)
{
	struct adapter_struct *adapter = netdev_priv(netdev);
	int i;

	netif_wake_queue(netdev);
	if (netif_is_multiqueue(netdev))
		for (i = 0; i < adapter->num_tx_queues; i++)
			netif_wake_subqueue(netdev, i);
}
void _kc_netif_tx_start_all_queues(struct net_device *netdev)
{
	struct adapter_struct *adapter = netdev_priv(netdev);
	int i;

	netif_start_queue(netdev);
	if (netif_is_multiqueue(netdev))
		for (i = 0; i < adapter->num_tx_queues; i++)
			netif_start_subqueue(netdev, i);
}
#endif /* HAVE_TX_MQ */

#ifndef __WARN_printf
void __kc_warn_slowpath(const char *file, int line, const char *fmt, ...)
{
	va_list args;

	printk(KERN_WARNING "------------[ cut here ]------------\n");
	printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file, line);
	va_start(args, fmt);
	vprintk(fmt, args);
	va_end(args);

	dump_stack();
}
#endif /* __WARN_printf */
#endif /* < 2.6.27 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) )

int
_kc_pci_prepare_to_sleep(struct pci_dev *dev)
{
	pci_power_t target_state;
	int error;

	target_state = pci_choose_state(dev, PMSG_SUSPEND);

	pci_enable_wake(dev, target_state, true);

	error = pci_set_power_state(dev, target_state);

	if (error)
		pci_enable_wake(dev, target_state, false);

	return error;
}

int
_kc_pci_wake_from_d3(struct pci_dev *dev, bool enable)
{
	int err;

	err = pci_enable_wake(dev, PCI_D3cold, enable);
	if (err)
		goto out;

	err = pci_enable_wake(dev, PCI_D3hot, enable);

out:
	return err;
}
#endif /* < 2.6.28 */

#if ( LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0) )
void _kc_skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,
			 int off, int size)
{
	skb_fill_page_desc(skb, i, page, off, size);
	skb->len += size;
	skb->data_len += size;
	skb->truesize += size;
}
#endif /* < 3.4.0 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30) )
#ifdef HAVE_NETDEV_SELECT_QUEUE
#include <net/ip.h>
static u32 _kc_simple_tx_hashrnd;
static u32 _kc_simple_tx_hashrnd_initialized;

u16 _kc_skb_tx_hash(struct net_device *dev, struct sk_buff *skb)
{
	u32 addr1, addr2, ports;
	u32 hash, ihl;
	u8 ip_proto = 0;

	if (unlikely(!_kc_simple_tx_hashrnd_initialized)) {
		get_random_bytes(&_kc_simple_tx_hashrnd, 4);
		_kc_simple_tx_hashrnd_initialized = 1;
	}

	switch (skb->protocol) {
	case htons(ETH_P_IP):
		if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
			ip_proto = ip_hdr(skb)->protocol;
		addr1 = ip_hdr(skb)->saddr;
		addr2 = ip_hdr(skb)->daddr;
		ihl = ip_hdr(skb)->ihl;
		break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case htons(ETH_P_IPV6):
		ip_proto = ipv6_hdr(skb)->nexthdr;
		addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
		addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
		ihl = (40 >> 2);
		break;
#endif
	default:
		return 0;
	}


	switch (ip_proto) {
	case IPPROTO_TCP:
	case IPPROTO_UDP:
	case IPPROTO_DCCP:
	case IPPROTO_ESP:
	case IPPROTO_AH:
	case IPPROTO_SCTP:
	case IPPROTO_UDPLITE:
		ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
		break;

	default:
		ports = 0;
		break;
	}

	hash = jhash_3words(addr1, addr2, ports, _kc_simple_tx_hashrnd);

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
}
#endif /* HAVE_NETDEV_SELECT_QUEUE */
#endif /* < 2.6.30 */

#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) )
#ifdef HAVE_TX_MQ
#ifndef CONFIG_NETDEVICES_MULTIQUEUE
void _kc_netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
{
	unsigned int real_num = dev->real_num_tx_queues;
	struct Qdisc *qdisc;
	int i;

	if (unlikely(txq > dev->num_tx_queues))
		;
	else if (txq > real_num)
		dev->real_num_tx_queues = txq;
	else if ( txq < real_num) {
		dev->real_num_tx_queues = txq;
		for (i = txq; i < dev->num_tx_queues; i++) {
			qdisc = netdev_get_tx_queue(dev, i)->qdisc;
			if (qdisc) {
				spin_lock_bh(qdisc_lock(qdisc));
				qdisc_reset(qdisc);
				spin_unlock_bh(qdisc_lock(qdisc));
			}
		}
	}
}
#endif /* CONFIG_NETDEVICES_MULTIQUEUE */
#endif /* HAVE_TX_MQ */
#endif /* < 2.6.35 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) )
static const u32 _kc_flags_dup_features =
	(ETH_FLAG_LRO | ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH);

u32 _kc_ethtool_op_get_flags(struct net_device *dev)
{
	return dev->features & _kc_flags_dup_features;
}

int _kc_ethtool_op_set_flags(struct net_device *dev, u32 data, u32 supported)
{
	if (data & ~supported)
		return -EINVAL;

	dev->features = ((dev->features & ~_kc_flags_dup_features) |
			 (data & _kc_flags_dup_features));
	return 0;
}
#endif /* < 2.6.36 */

/******************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39) )
#if (!(RHEL_RELEASE_CODE && RHEL_RELEASE_CODE > RHEL_RELEASE_VERSION(6,0)))
u8 _kc_netdev_get_num_tc(struct net_device *dev)
{
	struct adapter_struct *kc_adapter = netdev_priv(dev);
	if (kc_adapter->flags & IXGBE_FLAG_DCB_ENABLED)
		return kc_adapter->tc;
	else
		return 0;
}

u8 _kc_netdev_get_prio_tc_map(struct net_device *dev, u8 up)
{
	struct adapter_struct *kc_adapter = netdev_priv(dev);
	int tc;
	u8 map;

	for (tc = 0; tc < IXGBE_DCB_MAX_TRAFFIC_CLASS; tc++) {
		map = kc_adapter->dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap;

		if (map & (1 << up))
			return tc;
	}

	return 0;
}
#endif /* !(RHEL_RELEASE_CODE > RHEL_RELEASE_VERSION(6,0)) */
#endif /* < 2.6.39 */