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

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2007 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:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

#ifndef _IXGBE_H_
#define _IXGBE_H_

#include <linux/types.h>
#include <linux/pci.h>
#include <linux/netdevice.h>

#include "ixgbe_type.h"
#include "ixgbe_common.h"


#define IXGBE_ERR(args...) printk(KERN_ERR "ixgbe: " args)

#define PFX "ixgbe: "
#define DPRINTK(nlevel, klevel, fmt, args...) \
	((void)((NETIF_MSG_##nlevel & adapter->msg_enable) && \
	printk(KERN_##klevel PFX "%s: %s: " fmt, adapter->netdev->name, \
		__FUNCTION__ , ## args)))

/* TX/RX descriptor defines */
#define IXGBE_DEFAULT_TXD		   1024
#define IXGBE_MAX_TXD			   4096
#define IXGBE_MIN_TXD			     64

#define IXGBE_DEFAULT_RXD		   1024
#define IXGBE_MAX_RXD			   4096
#define IXGBE_MIN_RXD			     64

#define IXGBE_DEFAULT_RXQ			   1
#define IXGBE_MAX_RXQ				   1
#define IXGBE_MIN_RXQ				   1

#define IXGBE_DEFAULT_ITR_RX_USECS	    125  /*   8k irqs/sec */
#define IXGBE_DEFAULT_ITR_TX_USECS	    250  /*   4k irqs/sec */
#define IXGBE_MIN_ITR_USECS		    100  /* 500k irqs/sec */
#define IXGBE_MAX_ITR_USECS		  10000  /* 100  irqs/sec */

/* flow control */
#define IXGBE_DEFAULT_FCRTL		0x10000
#define IXGBE_MIN_FCRTL			      0
#define IXGBE_MAX_FCRTL			0x7FF80
#define IXGBE_DEFAULT_FCRTH		0x20000
#define IXGBE_MIN_FCRTH			      0
#define IXGBE_MAX_FCRTH			0x7FFF0
#define IXGBE_DEFAULT_FCPAUSE		 0x6800  /* may be too long */
#define IXGBE_MIN_FCPAUSE		      0
#define IXGBE_MAX_FCPAUSE		 0xFFFF

/* Supported Rx Buffer Sizes */
#define IXGBE_RXBUFFER_64    64     /* Used for packet split */
#define IXGBE_RXBUFFER_128   128    /* Used for packet split */
#define IXGBE_RXBUFFER_256   256    /* Used for packet split */
#define IXGBE_RXBUFFER_2048  2048

#define IXGBE_RX_HDR_SIZE IXGBE_RXBUFFER_256

#define MAXIMUM_ETHERNET_VLAN_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)

/* How many Tx Descriptors do we need to call netif_wake_queue? */
#define IXGBE_TX_QUEUE_WAKE 16

/* How many Rx Buffers do we bundle into one write to the hardware ? */
#define IXGBE_RX_BUFFER_WRITE	16	/* Must be power of 2 */

#define IXGBE_TX_FLAGS_CSUM		(u32)(1)
#define IXGBE_TX_FLAGS_VLAN		(u32)(1 << 1)
#define IXGBE_TX_FLAGS_TSO		(u32)(1 << 2)
#define IXGBE_TX_FLAGS_IPV4		(u32)(1 << 3)
#define IXGBE_TX_FLAGS_VLAN_MASK	0xffff0000
#define IXGBE_TX_FLAGS_VLAN_SHIFT	16

/* wrapper around a pointer to a socket buffer,
 * so a DMA handle can be stored along with the buffer */
struct ixgbe_tx_buffer {
	struct sk_buff *skb;
	dma_addr_t dma;
	unsigned long time_stamp;
	u16 length;
	u16 next_to_watch;
};

struct ixgbe_rx_buffer {
	struct sk_buff *skb;
	dma_addr_t dma;
	struct page *page;
	dma_addr_t page_dma;
};

struct ixgbe_queue_stats {
	u64 packets;
	u64 bytes;
};

struct ixgbe_ring {
	struct ixgbe_adapter *adapter;	/* backlink */
	void *desc;			/* descriptor ring memory */
	dma_addr_t dma;			/* phys. address of descriptor ring */
	unsigned int size;		/* length in bytes */
	unsigned int count;		/* amount of descriptors */
	unsigned int next_to_use;
	unsigned int next_to_clean;

	union {
		struct ixgbe_tx_buffer *tx_buffer_info;
		struct ixgbe_rx_buffer *rx_buffer_info;
	};

	u16 head;
	u16 tail;

	/* To protect race between sender and clean_tx_irq */
	spinlock_t tx_lock;

	struct ixgbe_queue_stats stats;

	u32 eims_value;
	u16 itr_register;

	char name[IFNAMSIZ + 5];
	u16 work_limit;                /* max work per interrupt */
};

/* Helper macros to switch between ints/sec and what the register uses.
 * And yes, it's the same math going both ways.
 */
#define EITR_INTS_PER_SEC_TO_REG(_eitr) \
	((_eitr) ? (1000000000 / ((_eitr) * 256)) : 0)
#define EITR_REG_TO_INTS_PER_SEC EITR_INTS_PER_SEC_TO_REG

#define IXGBE_DESC_UNUSED(R) \
	((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
	(R)->next_to_clean - (R)->next_to_use - 1)

#define IXGBE_RX_DESC_ADV(R, i)	    \
	(&(((union ixgbe_adv_rx_desc *)((R).desc))[i]))
#define IXGBE_TX_DESC_ADV(R, i)	    \
	(&(((union ixgbe_adv_tx_desc *)((R).desc))[i]))
#define IXGBE_TX_CTXTDESC_ADV(R, i)	    \
	(&(((struct ixgbe_adv_tx_context_desc *)((R).desc))[i]))

#define IXGBE_MAX_JUMBO_FRAME_SIZE        16128

/* board specific private data structure */
struct ixgbe_adapter {
	struct timer_list watchdog_timer;
	struct vlan_group *vlgrp;
	u16 bd_number;
	u16 rx_buf_len;
	atomic_t irq_sem;
	struct work_struct reset_task;

	/* TX */
	struct ixgbe_ring *tx_ring;	/* One per active queue */
	struct napi_struct napi;
	u64 restart_queue;
	u64 lsc_int;
	u64 hw_tso_ctxt;
	u64 hw_tso6_ctxt;
	u32 tx_timeout_count;
	bool detect_tx_hung;

	/* RX */
	struct ixgbe_ring *rx_ring;	/* One per active queue */
	u64 hw_csum_tx_good;
	u64 hw_csum_rx_error;
	u64 hw_csum_rx_good;
	u64 non_eop_descs;
	int num_tx_queues;
	int num_rx_queues;
	struct msix_entry *msix_entries;

	u64 rx_hdr_split;
	u32 alloc_rx_page_failed;
	u32 alloc_rx_buff_failed;

	u32 flags;
#define IXGBE_FLAG_RX_CSUM_ENABLED              (u32)(1)
#define IXGBE_FLAG_MSI_ENABLED                  (u32)(1 << 1)
#define IXGBE_FLAG_MSIX_ENABLED			(u32)(1 << 2)
#define IXGBE_FLAG_RX_PS_ENABLED		(u32)(1 << 3)
#define IXGBE_FLAG_IN_NETPOLL			(u32)(1 << 4)

	/* Interrupt Throttle Rate */
	u32 rx_eitr;
	u32 tx_eitr;

	/* OS defined structs */
	struct net_device *netdev;
	struct pci_dev *pdev;
	struct net_device_stats net_stats;

	/* structs defined in ixgbe_hw.h */
	struct ixgbe_hw hw;
	u16 msg_enable;
	struct ixgbe_hw_stats stats;
	char lsc_name[IFNAMSIZ + 5];

	unsigned long state;
	u64 tx_busy;
};

enum ixbge_state_t {
	__IXGBE_TESTING,
	__IXGBE_RESETTING,
	__IXGBE_DOWN
};

enum ixgbe_boards {
	board_82598,
};

extern struct ixgbe_info ixgbe_82598_info;

extern char ixgbe_driver_name[];
extern const char ixgbe_driver_version[];

extern int ixgbe_up(struct ixgbe_adapter *adapter);
extern void ixgbe_down(struct ixgbe_adapter *adapter);
extern void ixgbe_reset(struct ixgbe_adapter *adapter);
extern void ixgbe_update_stats(struct ixgbe_adapter *adapter);
extern void ixgbe_set_ethtool_ops(struct net_device *netdev);
extern int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
				    struct ixgbe_ring *rxdr);
extern int ixgbe_setup_tx_resources(struct ixgbe_adapter *adapter,
				    struct ixgbe_ring *txdr);

#endif /* _IXGBE_H_ */