Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 __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 struct sk_buff_head skb_pool;
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
52void netpoll_poll_dev(struct net_device *dev);
53void netpoll_poll_disable(struct net_device *dev);
54void netpoll_poll_enable(struct net_device *dev);
55#else
56static inline void netpoll_poll_disable(struct net_device *dev) { return; }
57static inline void netpoll_poll_enable(struct net_device *dev) { return; }
58#endif
59
60void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
61void netpoll_print_options(struct netpoll *np);
62int netpoll_parse_options(struct netpoll *np, char *opt);
63int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
64int netpoll_setup(struct netpoll *np);
65void __netpoll_cleanup(struct netpoll *np);
66void __netpoll_free(struct netpoll *np);
67void netpoll_cleanup(struct netpoll *np);
68void do_netpoll_cleanup(struct netpoll *np);
69netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
70
71#ifdef CONFIG_NETPOLL
72static inline void *netpoll_poll_lock(struct napi_struct *napi)
73{
74 struct net_device *dev = napi->dev;
75
76 if (dev && rcu_access_pointer(dev->npinfo)) {
77 int owner = smp_processor_id();
78
79 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
80 cpu_relax();
81
82 return napi;
83 }
84 return NULL;
85}
86
87static inline void netpoll_poll_unlock(void *have)
88{
89 struct napi_struct *napi = have;
90
91 if (napi)
92 smp_store_release(&napi->poll_owner, -1);
93}
94
95static inline bool netpoll_tx_running(struct net_device *dev)
96{
97 return irqs_disabled();
98}
99
100#else
101static inline void *netpoll_poll_lock(struct napi_struct *napi)
102{
103 return NULL;
104}
105static inline void netpoll_poll_unlock(void *have)
106{
107}
108static inline bool netpoll_tx_running(struct net_device *dev)
109{
110 return false;
111}
112#endif
113
114#endif