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
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 int owner = smp_processor_id();
82
83 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
84 cpu_relax();
85
86 return napi;
87 }
88 return NULL;
89}
90
91static inline void netpoll_poll_unlock(void *have)
92{
93 struct napi_struct *napi = have;
94
95 if (napi)
96 smp_store_release(&napi->poll_owner, -1);
97}
98
99static inline bool netpoll_tx_running(struct net_device *dev)
100{
101 return irqs_disabled();
102}
103
104#else
105static inline void *netpoll_poll_lock(struct napi_struct *napi)
106{
107 return NULL;
108}
109static inline void netpoll_poll_unlock(void *have)
110{
111}
112static inline void netpoll_netdev_init(struct net_device *dev)
113{
114}
115static inline bool netpoll_tx_running(struct net_device *dev)
116{
117 return false;
118}
119#endif
120
121#endif