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
17 union 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
25 struct 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
37 struct 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
51 void netpoll_poll_dev(struct net_device *dev);
52 void netpoll_poll_disable(struct net_device *dev);
53 void netpoll_poll_enable(struct net_device *dev);
54 #else
55 static inline void netpoll_poll_disable(struct net_device *dev) { return; }
56 static inline void netpoll_poll_enable(struct net_device *dev) { return; }
57 #endif
58
59 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
60 void netpoll_print_options(struct netpoll *np);
61 int netpoll_parse_options(struct netpoll *np, char *opt);
62 int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
63 int netpoll_setup(struct netpoll *np);
64 void __netpoll_cleanup(struct netpoll *np);
65 void __netpoll_free(struct netpoll *np);
66 void netpoll_cleanup(struct netpoll *np);
67 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
68
69 #ifdef CONFIG_NETPOLL
70 static 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
85 static 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
93 static inline bool netpoll_tx_running(struct net_device *dev)
94 {
95 return irqs_disabled();
96 }
97
98 #else
99 static inline void *netpoll_poll_lock(struct napi_struct *napi)
100 {
101 return NULL;
102 }
103 static inline void netpoll_poll_unlock(void *have)
104 {
105 }
106 static inline bool netpoll_tx_running(struct net_device *dev)
107 {
108 return false;
109 }
110 #endif
111
112 #endif
113
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