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 u32 local_ip, remote_ip;
22 u16 local_port, remote_port;
23 u8 remote_mac[ETH_ALEN];
24 };
25
26 struct netpoll_info {
27 atomic_t refcnt;
28 int rx_flags;
29 spinlock_t rx_lock;
30 struct netpoll *rx_np; /* netpoll that registered an rx_hook */
31 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
32 struct sk_buff_head txq;
33 struct delayed_work tx_work;
34 };
35
36 void netpoll_poll(struct netpoll *np);
37 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
38 void netpoll_print_options(struct netpoll *np);
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);
45
46
47 #ifdef CONFIG_NETPOLL
netpoll_rx(struct sk_buff * skb)48 static inline int netpoll_rx(struct sk_buff *skb)
49 {
50 struct netpoll_info *npinfo = skb->dev->npinfo;
51 unsigned long flags;
52 int ret = 0;
53
54 if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
55 return 0;
56
57 spin_lock_irqsave(&npinfo->rx_lock, flags);
58 /* check rx_flags again with the lock held */
59 if (npinfo->rx_flags && __netpoll_rx(skb))
60 ret = 1;
61 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
62
63 return ret;
64 }
65
netpoll_receive_skb(struct sk_buff * skb)66 static inline int netpoll_receive_skb(struct sk_buff *skb)
67 {
68 if (!list_empty(&skb->dev->napi_list))
69 return netpoll_rx(skb);
70 return 0;
71 }
72
netpoll_poll_lock(struct napi_struct * napi)73 static inline void *netpoll_poll_lock(struct napi_struct *napi)
74 {
75 struct net_device *dev = napi->dev;
76
77 rcu_read_lock(); /* deal with race on ->npinfo */
78 if (dev && dev->npinfo) {
79 spin_lock(&napi->poll_lock);
80 napi->poll_owner = smp_processor_id();
81 return napi;
82 }
83 return NULL;
84 }
85
netpoll_poll_unlock(void * have)86 static inline void netpoll_poll_unlock(void *have)
87 {
88 struct napi_struct *napi = have;
89
90 if (napi) {
91 napi->poll_owner = -1;
92 spin_unlock(&napi->poll_lock);
93 }
94 rcu_read_unlock();
95 }
96
97 #else
netpoll_rx(struct sk_buff * skb)98 static inline int netpoll_rx(struct sk_buff *skb)
99 {
100 return 0;
101 }
netpoll_receive_skb(struct sk_buff * skb)102 static inline int netpoll_receive_skb(struct sk_buff *skb)
103 {
104 return 0;
105 }
netpoll_poll_lock(struct napi_struct * napi)106 static inline void *netpoll_poll_lock(struct napi_struct *napi)
107 {
108 return NULL;
109 }
netpoll_poll_unlock(void * have)110 static inline void netpoll_poll_unlock(void *have)
111 {
112 }
netpoll_netdev_init(struct net_device * dev)113 static inline void netpoll_netdev_init(struct net_device *dev)
114 {
115 }
116 #endif
117
118 #endif
119