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

  Intel(R) Gigabit Ethernet Linux driver
  Copyright(c) 2007-2009 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

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

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

#include "igb.h"
#include "kcompat.h"

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,21) )
struct sk_buff *
_kc_skb_pad(struct sk_buff *skb, int pad)
{
        struct sk_buff *nskb;
        
        /* If the skbuff is non linear tailroom is always zero.. */
        if(skb_tailroom(skb) >= pad)
        {
                memset(skb->data+skb->len, 0, pad);
                return skb;
        }
        
        nskb = skb_copy_expand(skb, skb_headroom(skb), skb_tailroom(skb) + pad, GFP_ATOMIC);
        kfree_skb(skb);
        if(nskb)
                memset(nskb->data+nskb->len, 0, pad);
        return nskb;
} 
#endif /* < 2.4.21 */

/*****************************************************************************/
#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 = kmalloc(alloc_size, GFP_KERNEL);
	if (!dev)
		return NULL;
	memset(dev, 0, alloc_size);

	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;
}

#ifndef __VMKLNX__
/*
 * 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);
}
#endif /* __VMKLNX__ */

#endif /* 2.6.0 => 2.4.6 */

/*****************************************************************************/
#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(2,6,18) )
struct sk_buff *_kc_netdev_alloc_skb(struct net_device *dev,
                                     unsigned int length)
{
	/* 16 == NET_PAD_SKB */
	struct sk_buff *skb;
	skb = alloc_skb(length + 16, GFP_ATOMIC);
	if (likely(skb != NULL)) {
		skb_reserve(skb, 16);
		skb->dev = dev;
	}
	return skb;
}
#endif /* <= 2.6.17 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) )
int _kc_pci_save_state(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct adapter_struct *adapter = netdev_priv(netdev);
	int size = PCI_CONFIG_SPACE_LEN, i;
	u16 pcie_cap_offset = pci_find_capability(pdev, PCI_CAP_ID_EXP);
	u16 pcie_link_status;

	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 net_device *netdev = pci_get_drvdata(pdev);
	struct adapter_struct *adapter = netdev_priv(netdev);
	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
	}
}

#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
#endif /* <= 2.6.18 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24) )
#endif /* <= 2.6.24 */

/*****************************************************************************/
#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27) )
#ifdef HAVE_TX_MQ
#endif /* HAVE_TX_MQ */
#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(2,6,29) )
#endif /* < 2.6.29 */

/*****************************************************************************/
#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(2,6,33) )
struct sk_buff *_kc_netdev_alloc_skb_ip_align(struct net_device *dev,
                                              unsigned int length)
{
	struct sk_buff *skb = netdev_alloc_skb(dev, length + NET_IP_ALIGN);

	if (NET_IP_ALIGN && skb)
		skb_reserve(skb, NET_IP_ALIGN);
	return skb;
}
#endif /* < 2.6.33 */