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Commit | Line | Data |
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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> | |
12 | #include <linux/rcupdate.h> | |
13 | #include <linux/list.h> | |
14 | ||
15 | struct netpoll { | |
16 | struct net_device *dev; | |
17 | char dev_name[IFNAMSIZ]; | |
18 | const char *name; | |
19 | void (*rx_hook)(struct netpoll *, int, char *, int); | |
20 | ||
21 | __be32 local_ip, remote_ip; | |
22 | u16 local_port, remote_port; | |
23 | u8 remote_mac[ETH_ALEN]; | |
24 | ||
25 | struct list_head rx; /* rx_np list element */ | |
26 | struct rcu_head rcu; | |
27 | }; | |
28 | ||
29 | struct netpoll_info { | |
30 | atomic_t refcnt; | |
31 | ||
32 | int rx_flags; | |
33 | spinlock_t rx_lock; | |
34 | struct list_head rx_np; /* netpolls that registered an rx_hook */ | |
35 | ||
36 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ | |
37 | struct sk_buff_head txq; | |
38 | ||
39 | struct delayed_work tx_work; | |
40 | ||
41 | struct netpoll *netpoll; | |
42 | struct rcu_head rcu; | |
43 | }; | |
44 | ||
45 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); | |
46 | void netpoll_print_options(struct netpoll *np); | |
47 | int netpoll_parse_options(struct netpoll *np, char *opt); | |
48 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp); | |
49 | int netpoll_setup(struct netpoll *np); | |
50 | int netpoll_trap(void); | |
51 | void netpoll_set_trap(int trap); | |
52 | void __netpoll_cleanup(struct netpoll *np); | |
53 | void __netpoll_free_rcu(struct netpoll *np); | |
54 | void netpoll_cleanup(struct netpoll *np); | |
55 | int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo); | |
56 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, | |
57 | struct net_device *dev); | |
58 | static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
59 | { | |
60 | netpoll_send_skb_on_dev(np, skb, np->dev); | |
61 | } | |
62 | ||
63 | ||
64 | ||
65 | #ifdef CONFIG_NETPOLL | |
66 | static inline int netpoll_rx_on(struct sk_buff *skb) | |
67 | { | |
68 | struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo); | |
69 | ||
70 | return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags); | |
71 | } | |
72 | ||
73 | static inline bool netpoll_rx(struct sk_buff *skb) | |
74 | { | |
75 | struct netpoll_info *npinfo; | |
76 | unsigned long flags; | |
77 | bool ret = false; | |
78 | ||
79 | local_irq_save(flags); | |
80 | ||
81 | if (!netpoll_rx_on(skb)) | |
82 | goto out; | |
83 | ||
84 | npinfo = rcu_dereference_bh(skb->dev->npinfo); | |
85 | spin_lock(&npinfo->rx_lock); | |
86 | /* check rx_flags again with the lock held */ | |
87 | if (npinfo->rx_flags && __netpoll_rx(skb, npinfo)) | |
88 | ret = true; | |
89 | spin_unlock(&npinfo->rx_lock); | |
90 | ||
91 | out: | |
92 | local_irq_restore(flags); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | static inline int netpoll_receive_skb(struct sk_buff *skb) | |
97 | { | |
98 | if (!list_empty(&skb->dev->napi_list)) | |
99 | return netpoll_rx(skb); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
104 | { | |
105 | struct net_device *dev = napi->dev; | |
106 | ||
107 | if (dev && dev->npinfo) { | |
108 | spin_lock(&napi->poll_lock); | |
109 | napi->poll_owner = smp_processor_id(); | |
110 | return napi; | |
111 | } | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | static inline void netpoll_poll_unlock(void *have) | |
116 | { | |
117 | struct napi_struct *napi = have; | |
118 | ||
119 | if (napi) { | |
120 | napi->poll_owner = -1; | |
121 | spin_unlock(&napi->poll_lock); | |
122 | } | |
123 | } | |
124 | ||
125 | static inline int netpoll_tx_running(struct net_device *dev) | |
126 | { | |
127 | return irqs_disabled(); | |
128 | } | |
129 | ||
130 | #else | |
131 | static inline bool netpoll_rx(struct sk_buff *skb) | |
132 | { | |
133 | return 0; | |
134 | } | |
135 | static inline int netpoll_rx_on(struct sk_buff *skb) | |
136 | { | |
137 | return 0; | |
138 | } | |
139 | static inline int netpoll_receive_skb(struct sk_buff *skb) | |
140 | { | |
141 | return 0; | |
142 | } | |
143 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
144 | { | |
145 | return NULL; | |
146 | } | |
147 | static inline void netpoll_poll_unlock(void *have) | |
148 | { | |
149 | } | |
150 | static inline void netpoll_netdev_init(struct net_device *dev) | |
151 | { | |
152 | } | |
153 | static inline int netpoll_tx_running(struct net_device *dev) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | #endif | |
158 | ||
159 | #endif |