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/*$FreeBSD: releng/9.2/sys/dev/e1000/if_em.h 250458 2013-05-10 16:16:33Z luigi $*/


#ifndef _EM_H_DEFINED_
#define _EM_H_DEFINED_


/* Tunables */

/*
 * EM_TXD: Maximum number of Transmit Descriptors
 * Valid Range: 80-256 for 82542 and 82543-based adapters
 *              80-4096 for others
 * Default Value: 256
 *   This value is the number of transmit descriptors allocated by the driver.
 *   Increasing this value allows the driver to queue more transmits. Each
 *   descriptor is 16 bytes.
 *   Since TDLEN should be multiple of 128bytes, the number of transmit
 *   desscriptors should meet the following condition.
 *      (num_tx_desc * sizeof(struct e1000_tx_desc)) % 128 == 0
 */
#define EM_MIN_TXD		80
#define EM_MAX_TXD		4096
#define EM_DEFAULT_TXD		1024

/*
 * EM_RXD - Maximum number of receive Descriptors
 * Valid Range: 80-256 for 82542 and 82543-based adapters
 *              80-4096 for others
 * Default Value: 256
 *   This value is the number of receive descriptors allocated by the driver.
 *   Increasing this value allows the driver to buffer more incoming packets.
 *   Each descriptor is 16 bytes.  A receive buffer is also allocated for each
 *   descriptor. The maximum MTU size is 16110.
 *   Since TDLEN should be multiple of 128bytes, the number of transmit
 *   desscriptors should meet the following condition.
 *      (num_tx_desc * sizeof(struct e1000_tx_desc)) % 128 == 0
 */
#define EM_MIN_RXD		80
#define EM_MAX_RXD		4096
#define EM_DEFAULT_RXD		1024

/*
 * EM_TIDV - Transmit Interrupt Delay Value
 * Valid Range: 0-65535 (0=off)
 * Default Value: 64
 *   This value delays the generation of transmit interrupts in units of
 *   1.024 microseconds. Transmit interrupt reduction can improve CPU
 *   efficiency if properly tuned for specific network traffic. If the
 *   system is reporting dropped transmits, this value may be set too high
 *   causing the driver to run out of available transmit descriptors.
 */
#define EM_TIDV                         64

/*
 * EM_TADV - Transmit Absolute Interrupt Delay Value
 * (Not valid for 82542/82543/82544)
 * Valid Range: 0-65535 (0=off)
 * Default Value: 64
 *   This value, in units of 1.024 microseconds, limits the delay in which a
 *   transmit interrupt is generated. Useful only if EM_TIDV is non-zero,
 *   this value ensures that an interrupt is generated after the initial
 *   packet is sent on the wire within the set amount of time.  Proper tuning,
 *   along with EM_TIDV, may improve traffic throughput in specific
 *   network conditions.
 */
#define EM_TADV                         64

/*
 * EM_RDTR - Receive Interrupt Delay Timer (Packet Timer)
 * Valid Range: 0-65535 (0=off)
 * Default Value: 0
 *   This value delays the generation of receive interrupts in units of 1.024
 *   microseconds.  Receive interrupt reduction can improve CPU efficiency if
 *   properly tuned for specific network traffic. Increasing this value adds
 *   extra latency to frame reception and can end up decreasing the throughput
 *   of TCP traffic. If the system is reporting dropped receives, this value
 *   may be set too high, causing the driver to run out of available receive
 *   descriptors.
 *
 *   CAUTION: When setting EM_RDTR to a value other than 0, adapters
 *            may hang (stop transmitting) under certain network conditions.
 *            If this occurs a WATCHDOG message is logged in the system
 *            event log. In addition, the controller is automatically reset,
 *            restoring the network connection. To eliminate the potential
 *            for the hang ensure that EM_RDTR is set to 0.
 */
#define EM_RDTR                         0

/*
 * Receive Interrupt Absolute Delay Timer (Not valid for 82542/82543/82544)
 * Valid Range: 0-65535 (0=off)
 * Default Value: 64
 *   This value, in units of 1.024 microseconds, limits the delay in which a
 *   receive interrupt is generated. Useful only if EM_RDTR is non-zero,
 *   this value ensures that an interrupt is generated after the initial
 *   packet is received within the set amount of time.  Proper tuning,
 *   along with EM_RDTR, may improve traffic throughput in specific network
 *   conditions.
 */
#define EM_RADV                         64

/*
 * This parameter controls the max duration of transmit watchdog.
 */
#define EM_WATCHDOG                   (10 * hz)

/*
 * This parameter controls when the driver calls the routine to reclaim
 * transmit descriptors.
 */
#define EM_TX_CLEANUP_THRESHOLD	(adapter->num_tx_desc / 8)

/*
 * This parameter controls whether or not autonegotation is enabled.
 *              0 - Disable autonegotiation
 *              1 - Enable  autonegotiation
 */
#define DO_AUTO_NEG                     1

/*
 * This parameter control whether or not the driver will wait for
 * autonegotiation to complete.
 *              1 - Wait for autonegotiation to complete
 *              0 - Don't wait for autonegotiation to complete
 */
#define WAIT_FOR_AUTO_NEG_DEFAULT       0

/* Tunables -- End */

#define AUTONEG_ADV_DEFAULT	(ADVERTISE_10_HALF | ADVERTISE_10_FULL | \
				ADVERTISE_100_HALF | ADVERTISE_100_FULL | \
				ADVERTISE_1000_FULL)

#define AUTO_ALL_MODES		0

/* PHY master/slave setting */
#define EM_MASTER_SLAVE		e1000_ms_hw_default

/*
 * Micellaneous constants
 */
#define EM_VENDOR_ID                    0x8086
#define EM_FLASH                        0x0014 

#define EM_JUMBO_PBA                    0x00000028
#define EM_DEFAULT_PBA                  0x00000030
#define EM_SMARTSPEED_DOWNSHIFT         3
#define EM_SMARTSPEED_MAX               15
#define EM_MAX_LOOP			10

#define MAX_NUM_MULTICAST_ADDRESSES     128
#define PCI_ANY_ID                      (~0U)
#define ETHER_ALIGN                     2
#define EM_FC_PAUSE_TIME		0x0680
#define EM_EEPROM_APME			0x400;
#define EM_82544_APME			0x0004;

#define EM_QUEUE_IDLE			0
#define EM_QUEUE_WORKING		1
#define EM_QUEUE_HUNG			2

/*
 * TDBA/RDBA should be aligned on 16 byte boundary. But TDLEN/RDLEN should be
 * multiple of 128 bytes. So we align TDBA/RDBA on 128 byte boundary. This will
 * also optimize cache line size effect. H/W supports up to cache line size 128.
 */
#define EM_DBA_ALIGN			128

#define SPEED_MODE_BIT (1<<21)		/* On PCI-E MACs only */

/* PCI Config defines */
#define EM_BAR_TYPE(v)		((v) & EM_BAR_TYPE_MASK)
#define EM_BAR_TYPE_MASK	0x00000001
#define EM_BAR_TYPE_MMEM	0x00000000
#define EM_BAR_TYPE_FLASH	0x0014 
#define EM_BAR_MEM_TYPE(v)	((v) & EM_BAR_MEM_TYPE_MASK)
#define EM_BAR_MEM_TYPE_MASK	0x00000006
#define EM_BAR_MEM_TYPE_32BIT	0x00000000
#define EM_BAR_MEM_TYPE_64BIT	0x00000004
#define EM_MSIX_BAR		3	/* On 82575 */

/* More backward compatibility */
#if __FreeBSD_version < 900000
#define SYSCTL_ADD_UQUAD SYSCTL_ADD_QUAD
#endif

/* Defines for printing debug information */
#define DEBUG_INIT  0
#define DEBUG_IOCTL 0
#define DEBUG_HW    0

#define INIT_DEBUGOUT(S)            if (DEBUG_INIT)  printf(S "\n")
#define INIT_DEBUGOUT1(S, A)        if (DEBUG_INIT)  printf(S "\n", A)
#define INIT_DEBUGOUT2(S, A, B)     if (DEBUG_INIT)  printf(S "\n", A, B)
#define IOCTL_DEBUGOUT(S)           if (DEBUG_IOCTL) printf(S "\n")
#define IOCTL_DEBUGOUT1(S, A)       if (DEBUG_IOCTL) printf(S "\n", A)
#define IOCTL_DEBUGOUT2(S, A, B)    if (DEBUG_IOCTL) printf(S "\n", A, B)
#define HW_DEBUGOUT(S)              if (DEBUG_HW) printf(S "\n")
#define HW_DEBUGOUT1(S, A)          if (DEBUG_HW) printf(S "\n", A)
#define HW_DEBUGOUT2(S, A, B)       if (DEBUG_HW) printf(S "\n", A, B)

#define EM_MAX_SCATTER		32
#define EM_VFTA_SIZE		128
#define EM_TSO_SIZE		(65535 + sizeof(struct ether_vlan_header))
#define EM_TSO_SEG_SIZE		4096	/* Max dma segment size */
#define EM_MSIX_MASK		0x01F00000 /* For 82574 use */
#define EM_MSIX_LINK		0x01000000 /* For 82574 use */
#define ETH_ZLEN		60
#define ETH_ADDR_LEN		6
#define CSUM_OFFLOAD		7	/* Offload bits in mbuf flag */

/*
 * 82574 has a nonstandard address for EIAC
 * and since its only used in MSIX, and in
 * the em driver only 82574 uses MSIX we can
 * solve it just using this define.
 */
#define EM_EIAC 0x000DC

/*
 * Bus dma allocation structure used by
 * e1000_dma_malloc and e1000_dma_free.
 */
struct em_dma_alloc {
        bus_addr_t              dma_paddr;
        caddr_t                 dma_vaddr;
        bus_dma_tag_t           dma_tag;
        bus_dmamap_t            dma_map;
        bus_dma_segment_t       dma_seg;
        int                     dma_nseg;
};

struct adapter;

struct em_int_delay_info {
	struct adapter *adapter;	/* Back-pointer to the adapter struct */
	int offset;			/* Register offset to read/write */
	int value;			/* Current value in usecs */
};

/*
 * The transmit ring, one per tx queue
 */
struct tx_ring {
        struct adapter          *adapter;
        struct mtx              tx_mtx;
        char                    mtx_name[16];
        u32                     me;
        u32                     msix;
	u32			ims;
        int			queue_status;
        int                     watchdog_time;
	struct em_dma_alloc	txdma;
	struct e1000_tx_desc	*tx_base;
        struct task             tx_task;
        struct taskqueue        *tq;
        u32                     next_avail_desc;
        u32                     next_to_clean;
        struct em_buffer	*tx_buffers;
        volatile u16            tx_avail;
	u32			tx_tso;		/* last tx was tso */
        u16			last_hw_offload;
	u8			last_hw_ipcso;
	u8			last_hw_ipcss;
	u8			last_hw_tucso;
	u8			last_hw_tucss;
#if __FreeBSD_version >= 800000
	struct buf_ring         *br;
#endif
	/* Interrupt resources */
        bus_dma_tag_t           txtag;
	void                    *tag;
	struct resource         *res;
        unsigned long		tx_irq;
        unsigned long		no_desc_avail;
};

/*
 * The Receive ring, one per rx queue
 */
struct rx_ring {
        struct adapter          *adapter;
        u32                     me;
        u32                     msix;
	u32			ims;
        struct mtx              rx_mtx;
        char                    mtx_name[16];
        u32                     payload;
        struct task             rx_task;
        struct taskqueue        *tq;
        struct e1000_rx_desc	*rx_base;
        struct em_dma_alloc	rxdma;
        u32			next_to_refresh;
        u32			next_to_check;
        struct em_buffer	*rx_buffers;
	struct mbuf		*fmp;
	struct mbuf		*lmp;

        /* Interrupt resources */
        void                    *tag;
        struct resource         *res;
        bus_dma_tag_t           rxtag;
	bool			discard;

        /* Soft stats */
        unsigned long		rx_irq;
        unsigned long		rx_discarded;
        unsigned long		rx_packets;
        unsigned long		rx_bytes;
};


/* Our adapter structure */
struct adapter {
	struct ifnet	*ifp;
	struct e1000_hw	hw;

	/* FreeBSD operating-system-specific structures. */
	struct e1000_osdep osdep;
	struct device	*dev;
	struct cdev	*led_dev;

	struct resource *memory;
	struct resource *flash;
	struct resource *msix_mem;

	struct resource	*res;
	void		*tag;
	u32		linkvec;
	u32		ivars;

	struct ifmedia	media;
	struct callout	timer;
	int		msix;
	int		if_flags;
	int		max_frame_size;
	int		min_frame_size;
	int		pause_frames;
	struct mtx	core_mtx;
	int		em_insert_vlan_header;
	u32		ims;
	bool		in_detach;

	/* Task for FAST handling */
	struct task     link_task;
	struct task     que_task;
	struct taskqueue *tq;           /* private task queue */

	eventhandler_tag vlan_attach;
	eventhandler_tag vlan_detach;

	u16	num_vlans;
	u16	num_queues;

        /*
         * Transmit rings:
         *      Allocated at run time, an array of rings.
         */
        struct tx_ring  *tx_rings;
        int             num_tx_desc;
        u32		txd_cmd;

        /*
         * Receive rings:
         *      Allocated at run time, an array of rings.
         */
        struct rx_ring  *rx_rings;
        int             num_rx_desc;
        u32             rx_process_limit;
	u32		rx_mbuf_sz;

	/* Management and WOL features */
	u32		wol;
	bool		has_manage;
	bool		has_amt;

	/* Multicast array memory */
	u8		*mta;

	/*
	** Shadow VFTA table, this is needed because
	** the real vlan filter table gets cleared during
	** a soft reset and the driver needs to be able
	** to repopulate it.
	*/
	u32		shadow_vfta[EM_VFTA_SIZE];

	/* Info about the interface */
	u16		link_active;
	u16		fc;
	u16		link_speed;
	u16		link_duplex;
	u32		smartspeed;

	struct em_int_delay_info tx_int_delay;
	struct em_int_delay_info tx_abs_int_delay;
	struct em_int_delay_info rx_int_delay;
	struct em_int_delay_info rx_abs_int_delay;
	struct em_int_delay_info tx_itr;

	/* Misc stats maintained by the driver */
	unsigned long	dropped_pkts;
	unsigned long	mbuf_alloc_failed;
	unsigned long	mbuf_cluster_failed;
	unsigned long	no_tx_map_avail;
        unsigned long	no_tx_dma_setup;
	unsigned long	rx_overruns;
	unsigned long	watchdog_events;
	unsigned long	link_irq;

	struct e1000_hw_stats stats;
};

/********************************************************************************
 * vendor_info_array
 *
 * This array contains the list of Subvendor/Subdevice IDs on which the driver
 * should load.
 *
 ********************************************************************************/
typedef struct _em_vendor_info_t {
	unsigned int vendor_id;
	unsigned int device_id;
	unsigned int subvendor_id;
	unsigned int subdevice_id;
	unsigned int index;
} em_vendor_info_t;

struct em_buffer {
	int		next_eop;  /* Index of the desc to watch */
        struct mbuf    *m_head;
        bus_dmamap_t    map;         /* bus_dma map for packet */
};


/*
** Find the number of unrefreshed RX descriptors
*/
static inline u16
e1000_rx_unrefreshed(struct rx_ring *rxr)
{
	struct adapter	*adapter = rxr->adapter;

	if (rxr->next_to_check > rxr->next_to_refresh)
		return (rxr->next_to_check - rxr->next_to_refresh - 1);
	else
		return ((adapter->num_rx_desc + rxr->next_to_check) -
		    rxr->next_to_refresh - 1); 
}

#define	EM_CORE_LOCK_INIT(_sc, _name) \
	mtx_init(&(_sc)->core_mtx, _name, "EM Core Lock", MTX_DEF)
#define	EM_TX_LOCK_INIT(_sc, _name) \
	mtx_init(&(_sc)->tx_mtx, _name, "EM TX Lock", MTX_DEF)
#define	EM_RX_LOCK_INIT(_sc, _name) \
	mtx_init(&(_sc)->rx_mtx, _name, "EM RX Lock", MTX_DEF)
#define	EM_CORE_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->core_mtx)
#define	EM_TX_LOCK_DESTROY(_sc)		mtx_destroy(&(_sc)->tx_mtx)
#define	EM_RX_LOCK_DESTROY(_sc)		mtx_destroy(&(_sc)->rx_mtx)
#define	EM_CORE_LOCK(_sc)		mtx_lock(&(_sc)->core_mtx)
#define	EM_TX_LOCK(_sc)			mtx_lock(&(_sc)->tx_mtx)
#define	EM_TX_TRYLOCK(_sc)		mtx_trylock(&(_sc)->tx_mtx)
#define	EM_RX_LOCK(_sc)			mtx_lock(&(_sc)->rx_mtx)
#define	EM_CORE_UNLOCK(_sc)		mtx_unlock(&(_sc)->core_mtx)
#define	EM_TX_UNLOCK(_sc)		mtx_unlock(&(_sc)->tx_mtx)
#define	EM_RX_UNLOCK(_sc)		mtx_unlock(&(_sc)->rx_mtx)
#define	EM_CORE_LOCK_ASSERT(_sc)	mtx_assert(&(_sc)->core_mtx, MA_OWNED)
#define	EM_TX_LOCK_ASSERT(_sc)		mtx_assert(&(_sc)->tx_mtx, MA_OWNED)
#define	EM_RX_LOCK_ASSERT(_sc)		mtx_assert(&(_sc)->rx_mtx, MA_OWNED)

#endif /* _EM_H_DEFINED_ */
