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	netdevice_tracker dev_tracker;
28	char dev_name[IFNAMSIZ];
29	const char *name;
30
31	union inet_addr local_ip, remote_ip;
32	bool ipv6;
33	u16 local_port, remote_port;
34	u8 remote_mac[ETH_ALEN];
35};
36
37struct netpoll_info {
38	refcount_t refcnt;
39
40	struct semaphore dev_lock;
41
42	struct sk_buff_head txq;
43
44	struct delayed_work tx_work;
45
46	struct netpoll *netpoll;
47	struct rcu_head rcu;
48};
49
50#ifdef CONFIG_NETPOLL
51void netpoll_poll_dev(struct net_device *dev);
52void netpoll_poll_disable(struct net_device *dev);
53void netpoll_poll_enable(struct net_device *dev);
54#else
55static inline void netpoll_poll_disable(struct net_device *dev) { return; }
56static inline void netpoll_poll_enable(struct net_device *dev) { return; }
57#endif
58
59void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
60void netpoll_print_options(struct netpoll *np);
61int netpoll_parse_options(struct netpoll *np, char *opt);
62int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
63int netpoll_setup(struct netpoll *np);
64void __netpoll_cleanup(struct netpoll *np);
65void __netpoll_free(struct netpoll *np);
66void netpoll_cleanup(struct netpoll *np);
67netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
68
69#ifdef CONFIG_NETPOLL
70static inline void *netpoll_poll_lock(struct napi_struct *napi)
71{
72	struct net_device *dev = napi->dev;
73
74	if (dev && dev->npinfo) {
75		int owner = smp_processor_id();
76
77		while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
78			cpu_relax();
79
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		smp_store_release(&napi->poll_owner, -1);
91}
92
93static inline bool netpoll_tx_running(struct net_device *dev)
94{
95	return irqs_disabled();
96}
97
98#else
99static inline void *netpoll_poll_lock(struct napi_struct *napi)
100{
101	return NULL;
102}
103static inline void netpoll_poll_unlock(void *have)
104{
105}
106static inline bool netpoll_tx_running(struct net_device *dev)
107{
108	return false;
109}
110#endif
111
112#endif
113