Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
15struct netpoll;
16
17struct netpoll {
18 struct net_device *dev;
19 char dev_name[16], *name;
20 void (*rx_hook)(struct netpoll *, int, char *, int);
21 void (*drop)(struct sk_buff *skb);
22 u32 local_ip, remote_ip;
23 u16 local_port, remote_port;
24 unsigned char local_mac[6], remote_mac[6];
25};
26
27struct netpoll_info {
28 spinlock_t poll_lock;
29 int poll_owner;
30 int tries;
31 int rx_flags;
32 spinlock_t rx_lock;
33 struct netpoll *rx_np; /* netpoll that registered an rx_hook */
34 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
35};
36
37void netpoll_poll(struct netpoll *np);
38void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
39int netpoll_parse_options(struct netpoll *np, char *opt);
40int netpoll_setup(struct netpoll *np);
41int netpoll_trap(void);
42void netpoll_set_trap(int trap);
43void netpoll_cleanup(struct netpoll *np);
44int __netpoll_rx(struct sk_buff *skb);
45void netpoll_queue(struct sk_buff *skb);
46
47#ifdef CONFIG_NETPOLL
48static 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
66static inline void *netpoll_poll_lock(struct net_device *dev)
67{
68 rcu_read_lock(); /* deal with race on ->npinfo */
69 if (dev->npinfo) {
70 spin_lock(&dev->npinfo->poll_lock);
71 dev->npinfo->poll_owner = smp_processor_id();
72 return dev->npinfo;
73 }
74 return NULL;
75}
76
77static inline void netpoll_poll_unlock(void *have)
78{
79 struct netpoll_info *npi = have;
80
81 if (npi) {
82 npi->poll_owner = -1;
83 spin_unlock(&npi->poll_lock);
84 }
85 rcu_read_unlock();
86}
87
88#else
89#define netpoll_rx(a) 0
90#define netpoll_poll_lock(a) NULL
91#define netpoll_poll_unlock(a)
92#endif
93
94#endif