1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Common code for low-level network console, dump, and debugger code
4 *
5 * Derived from netconsole, kgdb-over-ethernet, and netdump patches
6 */
7
8#ifndef _LINUX_NETPOLL_H
9#define _LINUX_NETPOLL_H
10
11#include <linux/netdevice.h>
12#include <linux/interrupt.h>
13#include <linux/rcupdate.h>
14#include <linux/list.h>
15#include <linux/refcount.h>
16
17union inet_addr {
18 __u32 all[4];
19 __be32 ip;
20 __be32 ip6[4];
21 struct in_addr in;
22 struct in6_addr in6;
23};
24
25struct netpoll {
26 struct net_device *dev;
27 char dev_name[IFNAMSIZ];
28 const char *name;
29
30 union inet_addr local_ip, remote_ip;
31 bool ipv6;
32 u16 local_port, remote_port;
33 u8 remote_mac[ETH_ALEN];
34};
35
36struct netpoll_info {
37 refcount_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
50void netpoll_poll_dev(struct net_device *dev);
51void netpoll_poll_disable(struct net_device *dev);
52void netpoll_poll_enable(struct net_device *dev);
53#else
54static inline void netpoll_poll_disable(struct net_device *dev) { return; }
55static inline void netpoll_poll_enable(struct net_device *dev) { return; }
56#endif
57
58void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
59void netpoll_print_options(struct netpoll *np);
60int netpoll_parse_options(struct netpoll *np, char *opt);
61int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
62int netpoll_setup(struct netpoll *np);
63void __netpoll_cleanup(struct netpoll *np);
64void __netpoll_free(struct netpoll *np);
65void netpoll_cleanup(struct netpoll *np);
66void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
67 struct net_device *dev);
68static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
69{
70 unsigned long flags;
71 local_irq_save(flags);
72 netpoll_send_skb_on_dev(np, skb, np->dev);
73 local_irq_restore(flags);
74}
75
76#ifdef CONFIG_NETPOLL
77static inline void *netpoll_poll_lock(struct napi_struct *napi)
78{
79 struct net_device *dev = napi->dev;
80
81 if (dev && dev->npinfo) {
82 int owner = smp_processor_id();
83
84 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
85 cpu_relax();
86
87 return napi;
88 }
89 return NULL;
90}
91
92static inline void netpoll_poll_unlock(void *have)
93{
94 struct napi_struct *napi = have;
95
96 if (napi)
97 smp_store_release(&napi->poll_owner, -1);
98}
99
100static inline bool netpoll_tx_running(struct net_device *dev)
101{
102 return irqs_disabled();
103}
104
105#else
106static inline void *netpoll_poll_lock(struct napi_struct *napi)
107{
108 return NULL;
109}
110static inline void netpoll_poll_unlock(void *have)
111{
112}
113static inline void netpoll_netdev_init(struct net_device *dev)
114{
115}
116static inline bool netpoll_tx_running(struct net_device *dev)
117{
118 return false;
119}
120#endif
121
122#endif
123