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 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
26struct 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
36void netpoll_poll(struct netpoll *np);
37void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
38void netpoll_print_options(struct netpoll *np);
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);
45
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 int netpoll_rx_on(struct sk_buff *skb)
67{
68 struct netpoll_info *npinfo = skb->dev->npinfo;
69
70 return npinfo && (npinfo->rx_np || npinfo->rx_flags);
71}
72
73static inline int netpoll_receive_skb(struct sk_buff *skb)
74{
75 if (!list_empty(&skb->dev->napi_list))
76 return netpoll_rx(skb);
77 return 0;
78}
79
80static inline void *netpoll_poll_lock(struct napi_struct *napi)
81{
82 struct net_device *dev = napi->dev;
83
84 rcu_read_lock(); /* deal with race on ->npinfo */
85 if (dev && dev->npinfo) {
86 spin_lock(&napi->poll_lock);
87 napi->poll_owner = smp_processor_id();
88 return napi;
89 }
90 return NULL;
91}
92
93static inline void netpoll_poll_unlock(void *have)
94{
95 struct napi_struct *napi = have;
96
97 if (napi) {
98 napi->poll_owner = -1;
99 spin_unlock(&napi->poll_lock);
100 }
101 rcu_read_unlock();
102}
103
104#else
105static inline int netpoll_rx(struct sk_buff *skb)
106{
107 return 0;
108}
109static inline int netpoll_rx_on(struct sk_buff *skb)
110{
111 return 0;
112}
113static inline int netpoll_receive_skb(struct sk_buff *skb)
114{
115 return 0;
116}
117static inline void *netpoll_poll_lock(struct napi_struct *napi)
118{
119 return NULL;
120}
121static inline void netpoll_poll_unlock(void *have)
122{
123}
124static inline void netpoll_netdev_init(struct net_device *dev)
125{
126}
127#endif
128
129#endif