Linux核心数据结构--device

系统中每个网络设备都用一个设备数据结构来表示。

[b]struct device

{[/b]

/*

* This is the first field of the "visible" part of this structure

* (i.e. as seen by users in the "Space.c" file). It is the name

* the interface.

*/

[b]char *name;[/b]


/* I/O specific fields */

[b]unsigned long rmem_end; [/b] /* shmem "recv" end */

[b]unsigned long rmem_start;[/b] /* shmem "recv" start */

[b]unsigned long mem_end;[/b] /* shared mem end */

[b]unsigned long mem_start;[/b] /* shared mem start */

[b]unsigned long base_addr;[/b] /* device I/O address */

[b]unsigned char irq;[/b] /* device IRQ number */


/* Low-level status flags. */

[b]volatile unsigned char start, [/b] /* start an operation */

[b]interrupt; [/b] /* interrupt arrived */

[b]unsigned long tbusy; [/b] /* transmitter busy */

[b]struct device *next;[/b]


/* The device initialization function. Called only once. */

[b] int (*init)(struct device *dev);[/b]


/* Some hardware also needs these fields, but they are not part of

the usual set specified in Space.c. */

[b]unsigned char if_port;[/b] /* Selectable AUI,TP, */

[b]unsigned char dma; [/b] /* DMA channel */


[b]struct enet_statistics* (*get_stats)(struct device *dev);[/b]


/*

* This marks the end of the "visible" part of the structure. All

* fields hereafter are internal to the system, and may change at

* will (read: may be cleaned up at will).

*/


/* These may be needed for future network-power-down code. */

[b]unsigned long trans_start;[/b] /* Time (jiffies) of

last transmit */

[b]unsigned long last_rx;[/b] /* Time of last Rx */

[b] unsigned short flags; [/b] /* interface flags (BSD)*/

[b]unsigned short family;[/b] /* address family ID */

[b]unsigned short metric;[/b] /* routing metric */

[b]unsigned short mtu;[/b] /* MTU value */

[b]unsigned short type;[/b] /* hardware type */

[b]unsigned short hard_header_len; [/b]/* hardware hdr len */

[b]void *priv;[/b] /* private data */


/* Interface address info. */

[b]unsigned char broadcast[MAX_ADDR_LEN];

unsigned char pad;

unsigned char dev_addr[MAX_ADDR_LEN]; [/b]
[b]unsigned char addr_len; [/b] /* hardware addr len */

[b]unsigned long pa_addr;[/b] /* protocol address */

[b]unsigned long pa_brdaddr; [/b] /* protocol broadcast addr*/

[b]unsigned long pa_dstaddr;[/b] /* protocol P-P other addr*/

[b]unsigned long pa_mask; [/b] /* protocol netmask */

[b]unsigned short pa_alen;[/b] /* protocol address len */


[b]struct dev_mc_list *mc_list; [/b] /* M'cast mac addrs */

[b]int mc_count;[/b] /* No installed mcasts */



[b]struct ip_mc_list *ip_mc_list; [/b] /* IP m'cast filter chain */

[b]__u32 tx_queue_len;[/b] /* Max frames per queue */



/* For load balancing driver pair support */

[b]unsigned long pkt_queue; [/b] /* Packets queued */

[b]struct device *slave;[/b] /* Slave device */

[b]struct net_alias_info *alias_info; [/b] /* main dev alias info */

[b]struct net_alias *my_alias;[/b] /* alias devs */



/* Pointer to the interface buffers. */

[b]struct sk_buff_head buffs[DEV_NUMBUFFS];[/b]


/* Pointers to interface service routines. */

[b]int (*open)(struct device *dev);

int (*stop)(struct device *dev);

int (*hard_start_xmit) (struct sk_buff *skb,

struct device *dev);

int (*hard_header) (struct sk_buff *skb,

struct device *dev,

unsigned short type,

void *daddr,

void *saddr,

unsigned len);

int (*rebuild_header)(void *eth,

struct device *dev,

unsigned long raddr,

struct sk_buff *skb);

void (*set_multicast_list)(struct device *dev);

int (*set_mac_address)(struct device *dev,

void *addr);

int (*do_ioctl)(struct device *dev,

struct ifreq *ifr,

int cmd);

int (*set_config)(struct device *dev,

struct ifmap *map);

void (*header_cache_bind)(struct hh_cache **hhp,

struct device *dev,

unsigned short htype,

__u32 daddr);

void (*header_cache_update)(struct hh_cache *hh,

struct device *dev,

unsigned char * haddr);

int (*change_mtu)(struct device *dev,

int new_mtu);

struct iw_statistics* (*get_wireless_stats)(struct device *dev);

};[/b]