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 struct net_device *real_dev;
18 char dev_name[IFNAMSIZ];
19 const char *name;
20 void (*rx_hook)(struct netpoll *, int, char *, int);
21
22 __be32 local_ip, remote_ip;
23 u16 local_port, remote_port;
24 u8 remote_mac[ETH_ALEN];
25
26 struct list_head rx; /* rx_np list element */
27};
28
29struct 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};
43
44void netpoll_poll_dev(struct net_device *dev);
45void netpoll_poll(struct netpoll *np);
46void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
47void netpoll_print_options(struct netpoll *np);
48int netpoll_parse_options(struct netpoll *np, char *opt);
49int netpoll_setup(struct netpoll *np);
50int netpoll_trap(void);
51void netpoll_set_trap(int trap);
52void netpoll_cleanup(struct netpoll *np);
53int __netpoll_rx(struct sk_buff *skb);
54void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
55
56
57#ifdef CONFIG_NETPOLL
58static inline bool netpoll_rx(struct sk_buff *skb)
59{
60 struct netpoll_info *npinfo = skb->dev->npinfo;
61 unsigned long flags;
62 bool ret = false;
63
64 if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
65 return false;
66
67 spin_lock_irqsave(&npinfo->rx_lock, flags);
68 /* check rx_flags again with the lock held */
69 if (npinfo->rx_flags && __netpoll_rx(skb))
70 ret = true;
71 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
72
73 return ret;
74}
75
76static inline int netpoll_rx_on(struct sk_buff *skb)
77{
78 struct netpoll_info *npinfo = skb->dev->npinfo;
79
80 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
81}
82
83static inline int netpoll_receive_skb(struct sk_buff *skb)
84{
85 if (!list_empty(&skb->dev->napi_list))
86 return netpoll_rx(skb);
87 return 0;
88}
89
90static inline void *netpoll_poll_lock(struct napi_struct *napi)
91{
92 struct net_device *dev = napi->dev;
93
94 rcu_read_lock(); /* deal with race on ->npinfo */
95 if (dev && dev->npinfo) {
96 spin_lock(&napi->poll_lock);
97 napi->poll_owner = smp_processor_id();
98 return napi;
99 }
100 return NULL;
101}
102
103static inline void netpoll_poll_unlock(void *have)
104{
105 struct napi_struct *napi = have;
106
107 if (napi) {
108 napi->poll_owner = -1;
109 spin_unlock(&napi->poll_lock);
110 }
111 rcu_read_unlock();
112}
113
114#else
115static inline int netpoll_rx(struct sk_buff *skb)
116{
117 return 0;
118}
119static inline int netpoll_rx_on(struct sk_buff *skb)
120{
121 return 0;
122}
123static inline int netpoll_receive_skb(struct sk_buff *skb)
124{
125 return 0;
126}
127static inline void *netpoll_poll_lock(struct napi_struct *napi)
128{
129 return NULL;
130}
131static inline void netpoll_poll_unlock(void *have)
132{
133}
134static inline void netpoll_netdev_init(struct net_device *dev)
135{
136}
137#endif
138
139#endif