分类： LINUX
2009-09-21 10:33:38
先上代码！
复杂版本：
1. /*
2.
* The DEVICE structure.
3.
* Actually, this whole structure
is a big mistake. It mixes I/O
4.
* data with strictly "high-level"
data, and it has to know about
5.
* almost every data structure
used in the INET module.
6. *
7.
* FIXME: cleanup struct
net_device such that network protocol info
8.
* moves out.
9.
*/
10.
11. struct net_device
12. {
13.
14. /*
15.
* This is the first field of the "visible" part of this
structure
16.
* (i.e. as seen by users in the "Space.c" file). It is the name
17.
* the interface.
18.
*/
19. char name[IFNAMSIZ];
20. /* device name hash chain */
21. struct hlist_node name_hlist;
22. /* snmp alias */
23. char *ifalias;
24.
25. /*
26.
* I/O specific fields
27.
* FIXME: Merge these and struct
ifmap into one
28.
*/
29. unsigned long mem_end; /* shared mem end */
30. unsigned long mem_start; /* shared mem start */
31. unsigned long base_addr; /* device I/O address */
32. unsigned int irq; /* device IRQ number */
33.
34. /*
35.
* Some hardware also needs these
fields, but they are not
36.
* part of the usual set specified
in Space.c.
37.
*/
38.
39. unsigned char if_port; /* Selectable AUI, TP,..*/
40. unsigned char dma; /* DMA channel */
41.
42. unsigned long state;
43.
44. struct list_head dev_list;
45. struct list_head napi_list;
46.
47. /* Net device features */
48. unsigned long features;
49. #define NETIF_F_SG 1 /* Scatter/gather IO. */
50. #define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over
IPv4. */
51. #define NETIF_F_NO_CSUM 4 /* Does not require checksum.
F.e. loopack. */
52. #define NETIF_F_HW_CSUM 8 /* Can checksum all the packets.
*/
53. #define NETIF_F_IPV6_CSUM 16 /* Can
checksum TCP/UDP over IPV6 */
54. #define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
55. #define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
56. #define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
57. #define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
58. #define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
59. #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets
*/
60. #define NETIF_F_GSO 2048 /* Enable software GSO. */
61. #define NETIF_F_LLTX 4096 /* LockLess TX - deprecated.
Please */
62. /* do not use LLTX in new
drivers */
63. #define NETIF_F_NETNS_LOCAL 8192 /* Does not change network namespaces
*/
64. #define NETIF_F_GRO 16384 /*
Generic receive offload */
65. #define NETIF_F_LRO 32768 /*
large receive offload */
66.
67. /* Segmentation offload features */
68. #define NETIF_F_GSO_SHIFT 16
69. #define NETIF_F_GSO_MASK 0xffff0000
70. #define NETIF_F_TSO (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
71. #define NETIF_F_UFO (SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
72. #define NETIF_F_GSO_ROBUST (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
73. #define NETIF_F_TSO_ECN (SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
74. #define NETIF_F_TSO6 (SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
75.
76. /* List of features with software
fallbacks. */
77. #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
78.
79.
80. #define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
81. #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
82. #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
83. #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
84.
85. /*
86.
* If one device supports one of these features, then enable them
87.
* for all in netdev_increment_features.
88.
*/
89. #define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
90. NETIF_F_SG | NETIF_F_HIGHDMA | \
91. NETIF_F_FRAGLIST)
92.
93. /* Interface index. Unique device
identifier */
94. int ifindex;
95. int iflink;
96.
97. struct net_device_stats stats;
98.
99. #ifdef CONFIG_WIRELESS_EXT
100. /* List of functions to handle Wireless
Extensions (instead of ioctl).
101.
* See
102. const struct iw_handler_def *
wireless_handlers;
103. /* Instance data managed by the core of
Wireless Extensions. */
104. struct iw_public_data * wireless_data;
105. #endif
106. /* Management operations */
107. const struct net_device_ops *netdev_ops;
108. const struct ethtool_ops *ethtool_ops;
109.
110. /* Hardware header description */
111. const struct header_ops *header_ops;
112.
113. unsigned int flags; /* interface flags (a la BSD) */
114. unsigned short gflags;
115. unsigned short priv_flags; /* Like 'flags' but invisible to userspace. */
116. unsigned short padded; /* How much padding added by alloc_netdev() */
117.
118. unsigned char operstate; /* RFC2863 operstate */
119. unsigned char link_mode; /* mapping policy to operstate */
120.
121. unsigned mtu; /* interface MTU value */
122. unsigned short type; /* interface hardware type */
123. unsigned short hard_header_len; /*
hardware hdr length */
124.
125. /* extra head- and tailroom the hardware
may need, but not in all cases
126.
* can this be guaranteed, especially tailroom. Some cases also use
127.
* LL_MAX_HEADER instead to allocate the skb.
128.
*/
129. unsigned short needed_headroom;
130. unsigned short needed_tailroom;
131.
132. struct net_device *master; /* Pointer to master device of a group,
133. * which this device is
member of.
134. */
135.
136. /* Interface address info. */
137. unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw
address */
138. unsigned char addr_len; /* hardware address length */
139. unsigned short
dev_id; /*
for shared network cards */
140.
141. spinlock_t addr_list_lock;
142. struct dev_addr_list
*uc_list; /* Secondary unicast mac
addresses */
143. int uc_count; /* Number of installed
ucasts */
144. int uc_promisc;
145. struct dev_addr_list
*mc_list; /* Multicast mac addresses */
146. int mc_count; /* Number of installed
mcasts */
147. unsigned int promiscuity;
148. unsigned int allmulti;
149.
150.
151. /* Protocol specific pointers */
152.
153. #ifdef CONFIG_NET_DSA
154. void *dsa_ptr; /* dsa specific data */
155. #endif
156. void *atalk_ptr; /* AppleTalk
link */
157. void *ip_ptr; /* IPv4 specific data */
158. void *dn_ptr; /* DECnet specific data */
159. void *ip6_ptr;
/* IPv6 specific data */
160. void *ec_ptr; /* Econet specific data */
161. void *ax25_ptr; /* AX.25 specific data */
162. struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
163. assign before
registering */
164.
165. /*
166. *
Cache line mostly used on receive path (including eth_type_trans())
167.
*/
168. unsigned long last_rx; /* Time of last Rx */
169. /* Interface address info used in
eth_type_trans() */
170. unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address,
(before bcast
171. because most
packets are unicast) */
172.
173. unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
174.
175. struct netdev_queue rx_queue;
176.
177. struct netdev_queue *_tx ____cacheline_aligned_in_smp;
178.
179. /* Number of TX queues allocated at
alloc_netdev_mq() time */
180. unsigned int num_tx_queues;
181.
182. /* Number of TX queues currently active in
device */
183. unsigned int real_num_tx_queues;
184.
185. unsigned long tx_queue_len; /* Max frames per queue allowed
*/
186. spinlock_t tx_global_lock;
187. /*
188. *
One part is mostly used on xmit path (device)
189.
*/
190. /* These may be needed for future
network-power-down code. */
191. unsigned long trans_start; /* Time (in jiffies) of last Tx
*/
192.
193. int watchdog_timeo; /* used by dev_watchdog() */
194. struct timer_list watchdog_timer;
195.
196. /* Number of references to this device
*/
197. atomic_t refcnt ____cacheline_aligned_in_smp;
198.
199. /* delayed register/unregister */
200. struct list_head todo_list;
201. /* device index hash chain */
202. struct hlist_node index_hlist;
203.
204. struct net_device *link_watch_next;
205.
206. /* register/unregister state machine
*/
207. enum { NETREG_UNINITIALIZED=0,
208. NETREG_REGISTERED, /* completed register_netdevice
*/
209. NETREG_UNREGISTERING, /* called unregister_netdevice
*/
210. NETREG_UNREGISTERED, /* completed unregister todo */
211. NETREG_RELEASED, /* called free_netdev */
212. NETREG_DUMMY, /* dummy device for NAPI
poll */
213. } reg_state;
214.
215. /* Called from unregister, can be used to
call free_netdev */
216. void (*destructor)(struct net_device *dev);
217.
218. #ifdef CONFIG_NETPOLL
219. struct netpoll_info *npinfo;
220. #endif
221.
222. #ifdef CONFIG_NET_NS
223. /* Network namespace this network device
is inside */
224. struct net *nd_net;
225. #endif
226.
227. /* mid-layer private */
228. void *ml_priv;
229.
230. /* bridge stuff */
231. struct net_bridge_port
*br_port;
232. /* macvlan */
233. struct macvlan_port *macvlan_port;
234. /* GARP */
235. struct garp_port *管理员在2009年8月13日编辑了该文章文章。
