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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 { | |
93ec2c72 | 28 | atomic_t refcnt; |
1da177e4 LT |
29 | spinlock_t poll_lock; |
30 | int poll_owner; | |
0db1d6fc | 31 | int tries; |
115c1d6e | 32 | int rx_flags; |
fbeec2e1 JM |
33 | spinlock_t rx_lock; |
34 | struct netpoll *rx_np; /* netpoll that registered an rx_hook */ | |
068c6e98 | 35 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ |
1da177e4 LT |
36 | }; |
37 | ||
38 | void netpoll_poll(struct netpoll *np); | |
39 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); | |
40 | int netpoll_parse_options(struct netpoll *np, char *opt); | |
41 | int netpoll_setup(struct netpoll *np); | |
42 | int netpoll_trap(void); | |
43 | void netpoll_set_trap(int trap); | |
44 | void netpoll_cleanup(struct netpoll *np); | |
45 | int __netpoll_rx(struct sk_buff *skb); | |
46 | void netpoll_queue(struct sk_buff *skb); | |
47 | ||
48 | #ifdef CONFIG_NETPOLL | |
49 | static inline int netpoll_rx(struct sk_buff *skb) | |
50 | { | |
115c1d6e | 51 | struct netpoll_info *npinfo = skb->dev->npinfo; |
fbeec2e1 JM |
52 | unsigned long flags; |
53 | int ret = 0; | |
115c1d6e | 54 | |
fbeec2e1 | 55 | if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) |
115c1d6e JM |
56 | return 0; |
57 | ||
fbeec2e1 JM |
58 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
59 | /* check rx_flags again with the lock held */ | |
60 | if (npinfo->rx_flags && __netpoll_rx(skb)) | |
61 | ret = 1; | |
62 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
63 | ||
64 | return ret; | |
1da177e4 LT |
65 | } |
66 | ||
53fb95d3 | 67 | static inline void *netpoll_poll_lock(struct net_device *dev) |
1da177e4 | 68 | { |
53fb95d3 | 69 | rcu_read_lock(); /* deal with race on ->npinfo */ |
115c1d6e JM |
70 | if (dev->npinfo) { |
71 | spin_lock(&dev->npinfo->poll_lock); | |
72 | dev->npinfo->poll_owner = smp_processor_id(); | |
53fb95d3 | 73 | return dev->npinfo; |
1da177e4 | 74 | } |
53fb95d3 | 75 | return NULL; |
1da177e4 LT |
76 | } |
77 | ||
53fb95d3 | 78 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 79 | { |
53fb95d3 MM |
80 | struct netpoll_info *npi = have; |
81 | ||
82 | if (npi) { | |
83 | npi->poll_owner = -1; | |
84 | spin_unlock(&npi->poll_lock); | |
1da177e4 | 85 | } |
53fb95d3 | 86 | rcu_read_unlock(); |
1da177e4 LT |
87 | } |
88 | ||
89 | #else | |
90 | #define netpoll_rx(a) 0 | |
afb997c6 | 91 | #define netpoll_poll_lock(a) NULL |
1da177e4 LT |
92 | #define netpoll_poll_unlock(a) |
93 | #endif | |
94 | ||
95 | #endif |