Linux kernel mirror (for testing)
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linux
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 __be32 ip;
19 struct in6_addr in6;
20};
21
22struct netpoll {
23 struct net_device *dev;
24 netdevice_tracker dev_tracker;
25 /*
26 * Either dev_name or dev_mac can be used to specify the local
27 * interface - dev_name is used if it is a nonempty string, else
28 * dev_mac is used.
29 */
30 char dev_name[IFNAMSIZ];
31 u8 dev_mac[ETH_ALEN];
32 const char *name;
33
34 union inet_addr local_ip, remote_ip;
35 bool ipv6;
36 u16 local_port, remote_port;
37 u8 remote_mac[ETH_ALEN];
38 struct sk_buff_head skb_pool;
39 struct work_struct refill_wq;
40};
41
42#define np_info(np, fmt, ...) \
43 pr_info("%s: " fmt, np->name, ##__VA_ARGS__)
44#define np_err(np, fmt, ...) \
45 pr_err("%s: " fmt, np->name, ##__VA_ARGS__)
46#define np_notice(np, fmt, ...) \
47 pr_notice("%s: " fmt, np->name, ##__VA_ARGS__)
48
49struct netpoll_info {
50 refcount_t refcnt;
51
52 struct semaphore dev_lock;
53
54 struct sk_buff_head txq;
55
56 struct delayed_work tx_work;
57
58 struct netpoll *netpoll;
59 struct rcu_head rcu;
60};
61
62#ifdef CONFIG_NETPOLL
63void netpoll_poll_dev(struct net_device *dev);
64void netpoll_poll_disable(struct net_device *dev);
65void netpoll_poll_enable(struct net_device *dev);
66#else
67static inline void netpoll_poll_disable(struct net_device *dev) { return; }
68static inline void netpoll_poll_enable(struct net_device *dev) { return; }
69#endif
70
71int netpoll_send_udp(struct netpoll *np, const char *msg, int len);
72int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
73int netpoll_setup(struct netpoll *np);
74void __netpoll_free(struct netpoll *np);
75void netpoll_cleanup(struct netpoll *np);
76void do_netpoll_cleanup(struct netpoll *np);
77netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
78
79#ifdef CONFIG_NETPOLL
80static inline void *netpoll_poll_lock(struct napi_struct *napi)
81{
82 struct net_device *dev = napi->dev;
83
84 if (dev && rcu_access_pointer(dev->npinfo)) {
85 int owner = smp_processor_id();
86
87 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
88 cpu_relax();
89
90 return napi;
91 }
92 return NULL;
93}
94
95static inline void netpoll_poll_unlock(void *have)
96{
97 struct napi_struct *napi = have;
98
99 if (napi)
100 smp_store_release(&napi->poll_owner, -1);
101}
102
103static inline bool netpoll_tx_running(struct net_device *dev)
104{
105 return irqs_disabled();
106}
107
108#else
109static inline void *netpoll_poll_lock(struct napi_struct *napi)
110{
111 return NULL;
112}
113static inline void netpoll_poll_unlock(void *have)
114{
115}
116static inline bool netpoll_tx_running(struct net_device *dev)
117{
118 return false;
119}
120#endif
121
122#endif