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 struct work_struct cleanup_work;
36};
37
38struct netpoll_info {
39 refcount_t refcnt;
40
41 struct semaphore dev_lock;
42
43 struct sk_buff_head txq;
44
45 struct delayed_work tx_work;
46
47 struct netpoll *netpoll;
48 struct rcu_head rcu;
49};
50
51#ifdef CONFIG_NETPOLL
52extern void netpoll_poll_disable(struct net_device *dev);
53extern void 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_async(struct netpoll *np);
66void netpoll_cleanup(struct netpoll *np);
67void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
68 struct net_device *dev);
69static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
70{
71 unsigned long flags;
72 local_irq_save(flags);
73 netpoll_send_skb_on_dev(np, skb, np->dev);
74 local_irq_restore(flags);
75}
76
77#ifdef CONFIG_NETPOLL
78static inline void *netpoll_poll_lock(struct napi_struct *napi)
79{
80 struct net_device *dev = napi->dev;
81
82 if (dev && dev->npinfo) {
83 int owner = smp_processor_id();
84
85 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
86 cpu_relax();
87
88 return napi;
89 }
90 return NULL;
91}
92
93static inline void netpoll_poll_unlock(void *have)
94{
95 struct napi_struct *napi = have;
96
97 if (napi)
98 smp_store_release(&napi->poll_owner, -1);
99}
100
101static inline bool netpoll_tx_running(struct net_device *dev)
102{
103 return irqs_disabled();
104}
105
106#else
107static inline void *netpoll_poll_lock(struct napi_struct *napi)
108{
109 return NULL;
110}
111static inline void netpoll_poll_unlock(void *have)
112{
113}
114static inline void netpoll_netdev_init(struct net_device *dev)
115{
116}
117static inline bool netpoll_tx_running(struct net_device *dev)
118{
119 return false;
120}
121#endif
122
123#endif
124