/* Some hardware also needs these fields, but they are not part of the
usual set specified in Space.c. */
/* 一些硬件能够在一块板上支持多个接口，可能用到if_port。 */
unsigned char if_port; /* Selectable AUI, TP,..*/
unsigned char dma; /* DMA channel */
struct enet_statistics* (*get_stats)(struct device *dev);
/*
* 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. */
/* trans_start记录最后一次成功发送的时间。能够用来确定硬件是否工作正常。*/
unsigned long trans_start; /* Time (in jiffies) of last Tx */
unsigned long last_rx; /* Time of last Rx */
/* flags里面有很多内容，定义在include/linux/if.h里。*/
unsigned short flags; /* interface flags (a la BSD) */
unsigned short family; /* address family ID (AF_INET) */
unsigned short metric; /* routing metric (not used) */
unsigned short mtu; /* interface MTU value */
/* type标明物理硬件的类型。主要说明硬件是否需要arp。定义在
include/linux/if_arp.h里。 */
unsigned short type; /* interface hardware type */
/* 上层协议层根据hard_header_len在发送数据缓冲区前面预留硬件帧头空间。*/
unsigned short hard_header_len; /* hardware hdr length */
/* priv指向驱动程式自己定义的一些参数。*/
void *priv; /* pointer to private data */
/* Interface address info. */
unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
unsigned char pad; /* make dev_addr aligned
to 8
bytes */
unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */
unsigned char addr_len; /* hardware address length */
unsigned long pa_addr; /* protocol address */
unsigned long pa_brdaddr; /* protocol broadcast addr */
unsigned long pa_dstaddr; /* protocol P-P other side addr */
unsigned long pa_mask; /* protocol netmask */
unsigned short pa_alen; /* protocol address length */
struct dev_mc_list *mc_list; /* Multicast mac addresses */
int mc_count; /* Number of installed mcasts */
struct ip_mc_list *ip_mc_list; /* IP multicast filter chain */
__u32 tx_queue_len; /* Max frames per queue allowed */
------------------ Linux操作系统网络驱动程式编写 -------------------
------------ Contact the author by mailto:bordi@bordi.dhs.org ------
/* For load balancing driver pair support */
unsigned long pkt_queue; /* Packets queued */
struct device *slave; /* Slave device */
struct net_alias_info *alias_info; /* main dev alias info */
struct net_alias *my_alias; /* alias devs */
/* Pointer to the interface buffers. */
struct sk_buff_head buffs[DEV_NUMBUFFS];
/* Pointers to interface service routines. */
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);
#define HAVE_MULTICAST
void (*set_multicast_list)(struct device *dev);
#define HAVE_SET_MAC_ADDR
int (*set_mac_address)(struct device *dev, void *addr);
#define HAVE_PRIVATE_IOCTL
int (*do_ioctl)(struct device *dev, struct ifreq *ifr, int
cmd);
#define HAVE_SET_CONFIG
int (*set_config)(struct device *dev, struct ifmap *map);
#define HAVE_HEADER_CACHE
void (*header_cache_bind)(struct hh_cache **hhp, struct dev
ce
*dev, unsigned short htype, __u32 daddr);
void (*header_cache_update)(struct hh_cache *hh, struct dev
ce
*dev, unsigned char * haddr);
#define HAVE_CHANGE_MTU
int (*change_mtu)(struct device *dev, int new_mtu);
struct iw_statistics* (*get_wireless_stats)(struct device *dev);
};
2.4 常用的系统支持
2.4.1 内存申请和释放
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