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 u32 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 spinlock_t rx_lock;
29 struct netpoll *rx_np; /* netpoll that registered an rx_hook */
30 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
31 struct sk_buff_head txq;
32 struct delayed_work tx_work;
33};
34
35void netpoll_poll(struct netpoll *np);
36void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
37void netpoll_print_options(struct netpoll *np);
38int netpoll_parse_options(struct netpoll *np, char *opt);
39int netpoll_setup(struct netpoll *np);
40int netpoll_trap(void);
41void netpoll_set_trap(int trap);
42void netpoll_cleanup(struct netpoll *np);
43int __netpoll_rx(struct sk_buff *skb);
44
45
46#ifdef CONFIG_NETPOLL
47static inline int netpoll_rx(struct sk_buff *skb)
48{
49 struct netpoll_info *npinfo = skb->dev->npinfo;
50 unsigned long flags;
51 int ret = 0;
52
53 if (!npinfo || !npinfo->rx_np)
54 return 0;
55
56 spin_lock_irqsave(&npinfo->rx_lock, flags);
57 /* check rx_np again with the lock held */
58 if (npinfo->rx_np && __netpoll_rx(skb))
59 ret = 1;
60 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
61
62 return ret;
63}
64
65static inline int netpoll_receive_skb(struct sk_buff *skb)
66{
67 if (!list_empty(&skb->dev->napi_list))
68 return netpoll_rx(skb);
69 return 0;
70}
71
72static inline void *netpoll_poll_lock(struct napi_struct *napi)
73{
74 struct net_device *dev = napi->dev;
75
76 rcu_read_lock(); /* deal with race on ->npinfo */
77 if (dev && dev->npinfo) {
78 spin_lock(&napi->poll_lock);
79 napi->poll_owner = smp_processor_id();
80 return napi;
81 }
82 return NULL;
83}
84
85static inline void netpoll_poll_unlock(void *have)
86{
87 struct napi_struct *napi = have;
88
89 if (napi) {
90 napi->poll_owner = -1;
91 spin_unlock(&napi->poll_lock);
92 }
93 rcu_read_unlock();
94}
95
96static inline void netpoll_netdev_init(struct net_device *dev)
97{
98 INIT_LIST_HEAD(&dev->napi_list);
99}
100
101#else
102static inline int netpoll_rx(struct sk_buff *skb)
103{
104 return 0;
105}
106static inline int netpoll_receive_skb(struct sk_buff *skb)
107{
108 return 0;
109}
110static inline void *netpoll_poll_lock(struct napi_struct *napi)
111{
112 return NULL;
113}
114static inline void netpoll_poll_unlock(void *have)
115{
116}
117static inline void netpoll_netdev_init(struct net_device *dev)
118{
119}
120#endif
121
122#endif