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 rcu_head rcu;
59};
60
61#ifdef CONFIG_NETPOLL
62void netpoll_poll_dev(struct net_device *dev);
63void netpoll_poll_disable(struct net_device *dev);
64void netpoll_poll_enable(struct net_device *dev);
65#else
66static inline void netpoll_poll_disable(struct net_device *dev) { return; }
67static inline void netpoll_poll_enable(struct net_device *dev) { return; }
68#endif
69
70int netpoll_send_udp(struct netpoll *np, const char *msg, int len);
71int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
72int netpoll_setup(struct netpoll *np);
73void __netpoll_free(struct netpoll *np);
74void netpoll_cleanup(struct netpoll *np);
75void do_netpoll_cleanup(struct netpoll *np);
76netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
77
78#ifdef CONFIG_NETPOLL
79static inline void *netpoll_poll_lock(struct napi_struct *napi)
80{
81 struct net_device *dev = napi->dev;
82
83 if (dev && rcu_access_pointer(dev->npinfo)) {
84 int owner = smp_processor_id();
85
86 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
87 cpu_relax();
88
89 return napi;
90 }
91 return NULL;
92}
93
94static inline void netpoll_poll_unlock(void *have)
95{
96 struct napi_struct *napi = have;
97
98 if (napi)
99 smp_store_release(&napi->poll_owner, -1);
100}
101
102static inline bool netpoll_tx_running(struct net_device *dev)
103{
104 return irqs_disabled();
105}
106
107#else
108static inline void *netpoll_poll_lock(struct napi_struct *napi)
109{
110 return NULL;
111}
112static inline void netpoll_poll_unlock(void *have)
113{
114}
115static inline bool netpoll_tx_running(struct net_device *dev)
116{
117 return false;
118}
119#endif
120
121#endif