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 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
38 struct 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
52 void netpoll_poll_dev(struct net_device *dev);
53 void netpoll_poll_disable(struct net_device *dev);
54 void netpoll_poll_enable(struct net_device *dev);
55 #else
netpoll_poll_disable(struct net_device * dev)56 static inline void netpoll_poll_disable(struct net_device *dev) { return; }
netpoll_poll_enable(struct net_device * dev)57 static inline void netpoll_poll_enable(struct net_device *dev) { return; }
58 #endif
59
60 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
61 void netpoll_print_options(struct netpoll *np);
62 int netpoll_parse_options(struct netpoll *np, char *opt);
63 int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
64 int netpoll_setup(struct netpoll *np);
65 void __netpoll_cleanup(struct netpoll *np);
66 void __netpoll_free_async(struct netpoll *np);
67 void netpoll_cleanup(struct netpoll *np);
68 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
69 struct net_device *dev);
netpoll_send_skb(struct netpoll * np,struct sk_buff * skb)70 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
71 {
72 unsigned long flags;
73 local_irq_save(flags);
74 netpoll_send_skb_on_dev(np, skb, np->dev);
75 local_irq_restore(flags);
76 }
77
78 #ifdef CONFIG_NETPOLL
netpoll_poll_lock(struct napi_struct * napi)79 static inline void *netpoll_poll_lock(struct napi_struct *napi)
80 {
81 struct net_device *dev = napi->dev;
82
83 if (dev && 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
netpoll_poll_unlock(void * have)94 static 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
netpoll_tx_running(struct net_device * dev)102 static inline bool netpoll_tx_running(struct net_device *dev)
103 {
104 return irqs_disabled();
105 }
106
107 #else
netpoll_poll_lock(struct napi_struct * napi)108 static inline void *netpoll_poll_lock(struct napi_struct *napi)
109 {
110 return NULL;
111 }
netpoll_poll_unlock(void * have)112 static inline void netpoll_poll_unlock(void *have)
113 {
114 }
netpoll_netdev_init(struct net_device * dev)115 static inline void netpoll_netdev_init(struct net_device *dev)
116 {
117 }
netpoll_tx_running(struct net_device * dev)118 static inline bool netpoll_tx_running(struct net_device *dev)
119 {
120 return false;
121 }
122 #endif
123
124 #endif
125