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1 | /* |
2 | * Common code for low-level network console, dump, and debugger code |
3 | * |
4 | * Derived from netconsole, kgdb-over-ethernet, and netdump patches |
5 | */ |
6 | |
7 | #ifndef _LINUX_NETPOLL_H |
8 | #define _LINUX_NETPOLL_H |
9 | |
10 | #include <linux/netdevice.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/rcupdate.h> |
13 | #include <linux/list.h> |
14 | |
15 | struct netpoll { |
16 | struct net_device *dev; |
17 | char dev_name[IFNAMSIZ]; |
18 | const char *name; |
19 | void (*rx_hook)(struct netpoll *, int, char *, int); |
20 | |
21 | __be32 local_ip, remote_ip; |
22 | u16 local_port, remote_port; |
23 | u8 remote_mac[ETH_ALEN]; |
24 | }; |
25 | |
26 | struct netpoll_info { |
27 | atomic_t refcnt; |
28 | int rx_flags; |
29 | spinlock_t rx_lock; |
30 | struct netpoll *rx_np; /* netpoll that registered an rx_hook */ |
31 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ |
32 | struct sk_buff_head txq; |
33 | struct delayed_work tx_work; |
34 | }; |
35 | |
36 | void netpoll_poll(struct netpoll *np); |
37 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); |
38 | void netpoll_print_options(struct netpoll *np); |
39 | int netpoll_parse_options(struct netpoll *np, char *opt); |
40 | int netpoll_setup(struct netpoll *np); |
41 | int netpoll_trap(void); |
42 | void netpoll_set_trap(int trap); |
43 | void netpoll_cleanup(struct netpoll *np); |
44 | int __netpoll_rx(struct sk_buff *skb); |
45 | |
46 | |
47 | #ifdef CONFIG_NETPOLL |
48 | static inline int netpoll_rx(struct sk_buff *skb) |
49 | { |
50 | struct netpoll_info *npinfo = skb->dev->npinfo; |
51 | unsigned long flags; |
52 | int ret = 0; |
53 | |
54 | if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) |
55 | return 0; |
56 | |
57 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
58 | /* check rx_flags again with the lock held */ |
59 | if (npinfo->rx_flags && __netpoll_rx(skb)) |
60 | ret = 1; |
61 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
62 | |
63 | return ret; |
64 | } |
65 | |
66 | static inline int netpoll_rx_on(struct sk_buff *skb) |
67 | { |
68 | struct netpoll_info *npinfo = skb->dev->npinfo; |
69 | |
70 | return npinfo && (npinfo->rx_np || npinfo->rx_flags); |
71 | } |
72 | |
73 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
74 | { |
75 | if (!list_empty(&skb->dev->napi_list)) |
76 | return netpoll_rx(skb); |
77 | return 0; |
78 | } |
79 | |
80 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
81 | { |
82 | struct net_device *dev = napi->dev; |
83 | |
84 | rcu_read_lock(); /* deal with race on ->npinfo */ |
85 | if (dev && dev->npinfo) { |
86 | spin_lock(&napi->poll_lock); |
87 | napi->poll_owner = smp_processor_id(); |
88 | return napi; |
89 | } |
90 | return NULL; |
91 | } |
92 | |
93 | static inline void netpoll_poll_unlock(void *have) |
94 | { |
95 | struct napi_struct *napi = have; |
96 | |
97 | if (napi) { |
98 | napi->poll_owner = -1; |
99 | spin_unlock(&napi->poll_lock); |
100 | } |
101 | rcu_read_unlock(); |
102 | } |
103 | |
104 | #else |
105 | static inline int netpoll_rx(struct sk_buff *skb) |
106 | { |
107 | return 0; |
108 | } |
109 | static inline int netpoll_rx_on(struct sk_buff *skb) |
110 | { |
111 | return 0; |
112 | } |
113 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
114 | { |
115 | return 0; |
116 | } |
117 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
118 | { |
119 | return NULL; |
120 | } |
121 | static inline void netpoll_poll_unlock(void *have) |
122 | { |
123 | } |
124 | static inline void netpoll_netdev_init(struct net_device *dev) |
125 | { |
126 | } |
127 | #endif |
128 | |
129 | #endif |
130 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9