??????????????????????????Linux??????????????????????????汾????????θ??????????????????????????????????????????????2????????????????????????????????

?????????????е???????????????????????????????net/socket.c?е????sock_init()?????е?proto_init()????????dev_init()???????????豸??????????

?????????????￡???drivers/net/space.c?ж??????豸??????dev_base??????????????豸??????


struct device loopback_dev = {
 "lo"??   /* Software Loopback interface  */
 0x0??   /* recv memory end   */
 0x0??   /* recv memory start   */
 0x0??   /* memory end    */
 0x0??   /* memory start    */
 0??   /* base I/O address   */
 0??   /* IRQ     */
 0?? 0?? 0??  /* flags    */
 NEXT_DEV??  /* next device    */
 loopback_init  /* loopback_init should set up the rest */
};

struct device *dev_base = &loopback_dev;
 


??????NEXT_DEV???弴????????????????豸????????????????豸????????

???????????豸????壨include/linux/netdevice.h?????￡?


/*
 * The DEVICE structure.
 * Actually?? this whole structure is a big mistake.  It mixes I/O
 * data with strictly "high-level" data?? and it has to know about
 * almost every data structure used in the INET module.
 */
struct device
{

  /*
   * 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.
   */
  char     *name;

  /* I/O specific fields - FIXME: Merge these and struct ifmap into one */
  unsigned long    rmem_end;  /* shmem "recv" end */
  unsigned long    rmem_start;  /* shmem "recv" start */
  unsigned long    mem_end;  /* sahared mem end */
  unsigned long    mem_start;  /* shared mem start */
  unsigned long    base_addr;  /* device I/O address */
  unsigned char    irq;   /* device IRQ number */

  /* Low-level status flags. */
  volatile unsigned char  start??  /* start an operation */
                          tbusy??  /* transmitter busy */
                          interrupt;  /* interrupt arrived */

  struct device    *next;

  /* The device initialization function. Called only once. */
  int     (*init)(struct device *dev);

  /* Some hardware also needs these fields?? but they are not part of the
     usual set specified in Space.c. */
  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. */
  unsigned long    trans_start; /* Time (in jiffies) of last Tx */
  unsigned long    last_rx; /* Time of last Rx  */

  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  */
  unsigned short   type;  /* interface hardware type */
  unsigned short   hard_header_len; /* hardware hdr length */
  void     *priv; /* pointer to private data */

  /* Interface address info. */
  unsigned char    broadcast[MAX_ADDR_LEN]; /* hw bcast add */
  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    */
  
  /* For load balancing driver pair support */
 
  unsigned long     pkt_queue; /* Packets queued */
  struct device    *slave; /* Slave device */
 

  /* 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) (unsigned char *buff??
       struct device *dev??
       unsigned short type??
       void *daddr??
       void *saddr??
       unsigned len??
       struct sk_buff *skb);
  int     (*rebuild_header)(void *eth?? struct device *dev??
    unsigned long raddr?? struct sk_buff *skb);
  unsigned short   (*type_trans) (struct sk_buff *skb??
      struct device *dev);
#define HAVE_MULTICAST  
  void     (*set_multicast_list)(struct device *dev??
        int num_addrs?? void *addrs);
#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);
 
};