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 | |
1da177e4 LT |
21 | u32 local_ip, remote_ip; |
22 | u16 local_port, remote_port; | |
bf6bce71 | 23 | u8 local_mac[ETH_ALEN], remote_mac[ETH_ALEN]; |
115c1d6e JM |
24 | }; |
25 | ||
26 | struct netpoll_info { | |
93ec2c72 | 27 | atomic_t refcnt; |
115c1d6e | 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); | |
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); | |
5de4a473 | 44 | |
1da177e4 LT |
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 | ||
bea3348e | 65 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
1da177e4 | 66 | { |
bea3348e SH |
67 | if (!list_empty(&skb->dev->napi_list)) |
68 | return netpoll_rx(skb); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
73 | { | |
74 | struct net_device *dev = napi->dev; | |
75 | ||
53fb95d3 | 76 | rcu_read_lock(); /* deal with race on ->npinfo */ |
bea3348e SH |
77 | if (dev && dev->npinfo) { |
78 | spin_lock(&napi->poll_lock); | |
79 | napi->poll_owner = smp_processor_id(); | |
80 | return napi; | |
1da177e4 | 81 | } |
53fb95d3 | 82 | return NULL; |
1da177e4 LT |
83 | } |
84 | ||
53fb95d3 | 85 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 86 | { |
bea3348e | 87 | struct napi_struct *napi = have; |
53fb95d3 | 88 | |
bea3348e SH |
89 | if (napi) { |
90 | napi->poll_owner = -1; | |
91 | spin_unlock(&napi->poll_lock); | |
1da177e4 | 92 | } |
53fb95d3 | 93 | rcu_read_unlock(); |
1da177e4 LT |
94 | } |
95 | ||
bea3348e SH |
96 | static inline void netpoll_netdev_init(struct net_device *dev) |
97 | { | |
98 | INIT_LIST_HEAD(&dev->napi_list); | |
99 | } | |
100 | ||
1da177e4 | 101 | #else |
bea3348e SH |
102 | static inline int netpoll_rx(struct sk_buff *skb) |
103 | { | |
104 | return 0; | |
105 | } | |
106 | static inline int netpoll_receive_skb(struct sk_buff *skb) | |
107 | { | |
108 | return 0; | |
109 | } | |
110 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
111 | { | |
112 | return NULL; | |
113 | } | |
114 | static inline void netpoll_poll_unlock(void *have) | |
115 | { | |
116 | } | |
117 | static inline void netpoll_netdev_init(struct net_device *dev) | |
118 | { | |
119 | } | |
1da177e4 LT |
120 | #endif |
121 | ||
122 | #endif |