Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
15 | struct netpoll { |
16 | struct net_device *dev; | |
bf6bce71 SH |
17 | char dev_name[IFNAMSIZ]; |
18 | const char *name; | |
1da177e4 | 19 | void (*rx_hook)(struct netpoll *, int, char *, int); |
5de4a473 | 20 | |
e7557af5 | 21 | __be32 local_ip, remote_ip; |
1da177e4 | 22 | u16 local_port, remote_port; |
09538641 | 23 | u8 remote_mac[ETH_ALEN]; |
115c1d6e JM |
24 | }; |
25 | ||
26 | struct netpoll_info { | |
93ec2c72 | 27 | atomic_t refcnt; |
d9452e9f | 28 | int rx_flags; |
fbeec2e1 JM |
29 | spinlock_t rx_lock; |
30 | struct netpoll *rx_np; /* netpoll that registered an rx_hook */ | |
068c6e98 | 31 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ |
b6cd27ed | 32 | struct sk_buff_head txq; |
6d5aefb8 | 33 | struct delayed_work tx_work; |
1da177e4 LT |
34 | }; |
35 | ||
36 | void netpoll_poll(struct netpoll *np); | |
37 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); | |
0bcc1816 | 38 | void netpoll_print_options(struct netpoll *np); |
1da177e4 LT |
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); | |
5de4a473 | 45 | |
1da177e4 LT |
46 | |
47 | #ifdef CONFIG_NETPOLL | |
48 | static inline int netpoll_rx(struct sk_buff *skb) | |
49 | { | |
115c1d6e | 50 | struct netpoll_info *npinfo = skb->dev->npinfo; |
fbeec2e1 JM |
51 | unsigned long flags; |
52 | int ret = 0; | |
115c1d6e | 53 | |
d9452e9f | 54 | if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) |
115c1d6e JM |
55 | return 0; |
56 | ||
fbeec2e1 | 57 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
d9452e9f DM |
58 | /* check rx_flags again with the lock held */ |
59 | if (npinfo->rx_flags && __netpoll_rx(skb)) | |
fbeec2e1 JM |
60 | ret = 1; |
61 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
62 | ||
63 | return ret; | |
1da177e4 LT |
64 | } |
65 | ||
d1c76af9 HX |
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 | ||
bea3348e | 73 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
1da177e4 | 74 | { |
bea3348e SH |
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 | ||
53fb95d3 | 84 | rcu_read_lock(); /* deal with race on ->npinfo */ |
bea3348e SH |
85 | if (dev && dev->npinfo) { |
86 | spin_lock(&napi->poll_lock); | |
87 | napi->poll_owner = smp_processor_id(); | |
88 | return napi; | |
1da177e4 | 89 | } |
53fb95d3 | 90 | return NULL; |
1da177e4 LT |
91 | } |
92 | ||
53fb95d3 | 93 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 94 | { |
bea3348e | 95 | struct napi_struct *napi = have; |
53fb95d3 | 96 | |
bea3348e SH |
97 | if (napi) { |
98 | napi->poll_owner = -1; | |
99 | spin_unlock(&napi->poll_lock); | |
1da177e4 | 100 | } |
53fb95d3 | 101 | rcu_read_unlock(); |
1da177e4 LT |
102 | } |
103 | ||
104 | #else | |
bea3348e SH |
105 | static inline int netpoll_rx(struct sk_buff *skb) |
106 | { | |
107 | return 0; | |
108 | } | |
d1c76af9 HX |
109 | static inline int netpoll_rx_on(struct sk_buff *skb) |
110 | { | |
111 | return 0; | |
112 | } | |
bea3348e SH |
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 | } | |
1da177e4 LT |
127 | #endif |
128 | ||
129 | #endif |