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Commit | Line | Data |
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1da177e4 LT |
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> | |
53fb95d3 | 12 | #include <linux/rcupdate.h> |
1da177e4 LT |
13 | #include <linux/list.h> |
14 | ||
15 | struct netpoll; | |
16 | ||
17 | struct netpoll { | |
18 | struct net_device *dev; | |
19 | char dev_name[16], *name; | |
1da177e4 LT |
20 | void (*rx_hook)(struct netpoll *, int, char *, int); |
21 | void (*drop)(struct sk_buff *skb); | |
22 | u32 local_ip, remote_ip; | |
23 | u16 local_port, remote_port; | |
24 | unsigned char local_mac[6], remote_mac[6]; | |
115c1d6e JM |
25 | }; |
26 | ||
27 | struct netpoll_info { | |
1da177e4 LT |
28 | spinlock_t poll_lock; |
29 | int poll_owner; | |
0db1d6fc | 30 | int tries; |
115c1d6e | 31 | int rx_flags; |
fbeec2e1 JM |
32 | spinlock_t rx_lock; |
33 | struct netpoll *rx_np; /* netpoll that registered an rx_hook */ | |
1da177e4 LT |
34 | }; |
35 | ||
36 | void netpoll_poll(struct netpoll *np); | |
37 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); | |
38 | int netpoll_parse_options(struct netpoll *np, char *opt); | |
39 | int netpoll_setup(struct netpoll *np); | |
40 | int netpoll_trap(void); | |
41 | void netpoll_set_trap(int trap); | |
42 | void netpoll_cleanup(struct netpoll *np); | |
43 | int __netpoll_rx(struct sk_buff *skb); | |
44 | void netpoll_queue(struct sk_buff *skb); | |
45 | ||
46 | #ifdef CONFIG_NETPOLL | |
47 | static inline int netpoll_rx(struct sk_buff *skb) | |
48 | { | |
115c1d6e | 49 | struct netpoll_info *npinfo = skb->dev->npinfo; |
fbeec2e1 JM |
50 | unsigned long flags; |
51 | int ret = 0; | |
115c1d6e | 52 | |
fbeec2e1 | 53 | if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) |
115c1d6e JM |
54 | return 0; |
55 | ||
fbeec2e1 JM |
56 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
57 | /* check rx_flags again with the lock held */ | |
58 | if (npinfo->rx_flags && __netpoll_rx(skb)) | |
59 | ret = 1; | |
60 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
61 | ||
62 | return ret; | |
1da177e4 LT |
63 | } |
64 | ||
53fb95d3 | 65 | static inline void *netpoll_poll_lock(struct net_device *dev) |
1da177e4 | 66 | { |
53fb95d3 | 67 | rcu_read_lock(); /* deal with race on ->npinfo */ |
115c1d6e JM |
68 | if (dev->npinfo) { |
69 | spin_lock(&dev->npinfo->poll_lock); | |
70 | dev->npinfo->poll_owner = smp_processor_id(); | |
53fb95d3 | 71 | return dev->npinfo; |
1da177e4 | 72 | } |
53fb95d3 | 73 | return NULL; |
1da177e4 LT |
74 | } |
75 | ||
53fb95d3 | 76 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 77 | { |
53fb95d3 MM |
78 | struct netpoll_info *npi = have; |
79 | ||
80 | if (npi) { | |
81 | npi->poll_owner = -1; | |
82 | spin_unlock(&npi->poll_lock); | |
1da177e4 | 83 | } |
53fb95d3 | 84 | rcu_read_unlock(); |
1da177e4 LT |
85 | } |
86 | ||
87 | #else | |
88 | #define netpoll_rx(a) 0 | |
53fb95d3 | 89 | #define netpoll_poll_lock(a) 0 |
1da177e4 LT |
90 | #define netpoll_poll_unlock(a) |
91 | #endif | |
92 | ||
93 | #endif |