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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 | ||
1da177e4 LT |
15 | struct netpoll { |
16 | struct net_device *dev; | |
0e34e931 | 17 | struct net_device *real_dev; |
bf6bce71 SH |
18 | char dev_name[IFNAMSIZ]; |
19 | const char *name; | |
1da177e4 | 20 | void (*rx_hook)(struct netpoll *, int, char *, int); |
5de4a473 | 21 | |
e7557af5 | 22 | __be32 local_ip, remote_ip; |
1da177e4 | 23 | u16 local_port, remote_port; |
09538641 | 24 | u8 remote_mac[ETH_ALEN]; |
508e14b4 DB |
25 | |
26 | struct list_head rx; /* rx_np list element */ | |
115c1d6e JM |
27 | }; |
28 | ||
29 | struct netpoll_info { | |
93ec2c72 | 30 | atomic_t refcnt; |
508e14b4 | 31 | |
d9452e9f | 32 | int rx_flags; |
fbeec2e1 | 33 | spinlock_t rx_lock; |
508e14b4 DB |
34 | struct list_head rx_np; /* netpolls that registered an rx_hook */ |
35 | ||
068c6e98 | 36 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ |
b6cd27ed | 37 | struct sk_buff_head txq; |
508e14b4 | 38 | |
6d5aefb8 | 39 | struct delayed_work tx_work; |
0e34e931 WC |
40 | |
41 | struct netpoll *netpoll; | |
1da177e4 LT |
42 | }; |
43 | ||
0e34e931 | 44 | void netpoll_poll_dev(struct net_device *dev); |
1da177e4 LT |
45 | void netpoll_poll(struct netpoll *np); |
46 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); | |
0bcc1816 | 47 | void netpoll_print_options(struct netpoll *np); |
1da177e4 | 48 | int netpoll_parse_options(struct netpoll *np, char *opt); |
8fdd95ec | 49 | int __netpoll_setup(struct netpoll *np); |
1da177e4 LT |
50 | int netpoll_setup(struct netpoll *np); |
51 | int netpoll_trap(void); | |
52 | void netpoll_set_trap(int trap); | |
8fdd95ec | 53 | void __netpoll_cleanup(struct netpoll *np); |
1da177e4 LT |
54 | void netpoll_cleanup(struct netpoll *np); |
55 | int __netpoll_rx(struct sk_buff *skb); | |
0e34e931 | 56 | void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); |
5de4a473 | 57 | |
1da177e4 LT |
58 | |
59 | #ifdef CONFIG_NETPOLL | |
ffb27362 | 60 | static inline bool netpoll_rx(struct sk_buff *skb) |
1da177e4 | 61 | { |
de85d99e | 62 | struct netpoll_info *npinfo; |
fbeec2e1 | 63 | unsigned long flags; |
ffb27362 | 64 | bool ret = false; |
115c1d6e | 65 | |
de85d99e | 66 | rcu_read_lock_bh(); |
d5f31fbf | 67 | npinfo = rcu_dereference_bh(skb->dev->npinfo); |
de85d99e | 68 | |
508e14b4 | 69 | if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags)) |
de85d99e | 70 | goto out; |
115c1d6e | 71 | |
fbeec2e1 | 72 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
d9452e9f DM |
73 | /* check rx_flags again with the lock held */ |
74 | if (npinfo->rx_flags && __netpoll_rx(skb)) | |
ffb27362 | 75 | ret = true; |
fbeec2e1 JM |
76 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
77 | ||
de85d99e HX |
78 | out: |
79 | rcu_read_unlock_bh(); | |
fbeec2e1 | 80 | return ret; |
1da177e4 LT |
81 | } |
82 | ||
d1c76af9 HX |
83 | static inline int netpoll_rx_on(struct sk_buff *skb) |
84 | { | |
d5f31fbf | 85 | struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo); |
d1c76af9 | 86 | |
508e14b4 | 87 | return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags); |
d1c76af9 HX |
88 | } |
89 | ||
bea3348e | 90 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
1da177e4 | 91 | { |
bea3348e SH |
92 | if (!list_empty(&skb->dev->napi_list)) |
93 | return netpoll_rx(skb); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
98 | { | |
99 | struct net_device *dev = napi->dev; | |
100 | ||
bea3348e SH |
101 | if (dev && dev->npinfo) { |
102 | spin_lock(&napi->poll_lock); | |
103 | napi->poll_owner = smp_processor_id(); | |
104 | return napi; | |
1da177e4 | 105 | } |
53fb95d3 | 106 | return NULL; |
1da177e4 LT |
107 | } |
108 | ||
53fb95d3 | 109 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 110 | { |
bea3348e | 111 | struct napi_struct *napi = have; |
53fb95d3 | 112 | |
bea3348e SH |
113 | if (napi) { |
114 | napi->poll_owner = -1; | |
115 | spin_unlock(&napi->poll_lock); | |
1da177e4 LT |
116 | } |
117 | } | |
118 | ||
c18370f5 HX |
119 | static inline int netpoll_tx_running(struct net_device *dev) |
120 | { | |
121 | return irqs_disabled(); | |
122 | } | |
123 | ||
1da177e4 | 124 | #else |
969a6e52 | 125 | static inline bool netpoll_rx(struct sk_buff *skb) |
bea3348e SH |
126 | { |
127 | return 0; | |
128 | } | |
d1c76af9 HX |
129 | static inline int netpoll_rx_on(struct sk_buff *skb) |
130 | { | |
131 | return 0; | |
132 | } | |
bea3348e SH |
133 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
134 | { | |
135 | return 0; | |
136 | } | |
137 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
138 | { | |
139 | return NULL; | |
140 | } | |
141 | static inline void netpoll_poll_unlock(void *have) | |
142 | { | |
143 | } | |
144 | static inline void netpoll_netdev_init(struct net_device *dev) | |
145 | { | |
146 | } | |
c18370f5 HX |
147 | static inline int netpoll_tx_running(struct net_device *dev) |
148 | { | |
149 | return 0; | |
150 | } | |
1da177e4 LT |
151 | #endif |
152 | ||
153 | #endif |