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
15union inet_addr {
16	__u32		all[4];
17	__be32		ip;
18	__be32		ip6[4];
19	struct in_addr	in;
20	struct in6_addr	in6;
21};
22
23struct netpoll {
24	struct net_device *dev;
25	char dev_name[IFNAMSIZ];
26	const char *name;
27
28	union inet_addr local_ip, remote_ip;
29	bool ipv6;
30	u16 local_port, remote_port;
31	u8 remote_mac[ETH_ALEN];
32
33	struct work_struct cleanup_work;
34};
35
36struct netpoll_info {
37	atomic_t refcnt;
38
39	struct semaphore dev_lock;
40
41	struct sk_buff_head txq;
42
43	struct delayed_work tx_work;
44
45	struct netpoll *netpoll;
46	struct rcu_head rcu;
47};
48
49#ifdef CONFIG_NETPOLL
50extern void netpoll_poll_disable(struct net_device *dev);
51extern void netpoll_poll_enable(struct net_device *dev);
52#else
53static inline void netpoll_poll_disable(struct net_device *dev) { return; }
54static inline void netpoll_poll_enable(struct net_device *dev) { return; }
55#endif
56
57void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
58void netpoll_print_options(struct netpoll *np);
59int netpoll_parse_options(struct netpoll *np, char *opt);
60int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
61int netpoll_setup(struct netpoll *np);
62void __netpoll_cleanup(struct netpoll *np);
63void __netpoll_free_async(struct netpoll *np);
64void netpoll_cleanup(struct netpoll *np);
65void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
66			     struct net_device *dev);
67static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
68{
69	unsigned long flags;
70	local_irq_save(flags);
71	netpoll_send_skb_on_dev(np, skb, np->dev);
72	local_irq_restore(flags);
73}
74
75#ifdef CONFIG_NETPOLL
76static inline void *netpoll_poll_lock(struct napi_struct *napi)
77{
78	struct net_device *dev = napi->dev;
79
80	if (dev && dev->npinfo) {
81		spin_lock(&napi->poll_lock);
82		napi->poll_owner = smp_processor_id();
83		return napi;
84	}
85	return NULL;
86}
87
88static inline void netpoll_poll_unlock(void *have)
89{
90	struct napi_struct *napi = have;
91
92	if (napi) {
93		napi->poll_owner = -1;
94		spin_unlock(&napi->poll_lock);
95	}
96}
97
98static inline bool netpoll_tx_running(struct net_device *dev)
99{
100	return irqs_disabled();
101}
102
103#else
104static inline void *netpoll_poll_lock(struct napi_struct *napi)
105{
106	return NULL;
107}
108static inline void netpoll_poll_unlock(void *have)
109{
110}
111static inline void netpoll_netdev_init(struct net_device *dev)
112{
113}
114static inline bool netpoll_tx_running(struct net_device *dev)
115{
116	return false;
117}
118#endif
119
120#endif
121