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
36 struct netpoll_info {
37 refcount_t refcnt;
38
39 struct semaphore dev_lock;
40
41 struct sk_buff_head txq;
42
43 struct delayed_work tx_work;
44
45 struct netpoll *netpoll;
46 struct rcu_head rcu;
47 };
48
49 #ifdef CONFIG_NETPOLL
50 void netpoll_poll_dev(struct net_device *dev);
51 void netpoll_poll_disable(struct net_device *dev);
52 void netpoll_poll_enable(struct net_device *dev);
53 #else
netpoll_poll_disable(struct net_device * dev)54 static inline void netpoll_poll_disable(struct net_device *dev) { return; }
netpoll_poll_enable(struct net_device * dev)55 static inline void netpoll_poll_enable(struct net_device *dev) { return; }
56 #endif
57
58 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
59 void netpoll_print_options(struct netpoll *np);
60 int netpoll_parse_options(struct netpoll *np, char *opt);
61 int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
62 int netpoll_setup(struct netpoll *np);
63 void __netpoll_cleanup(struct netpoll *np);
64 void __netpoll_free(struct netpoll *np);
65 void netpoll_cleanup(struct netpoll *np);
66 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
67 struct net_device *dev);
netpoll_send_skb(struct netpoll * np,struct sk_buff * skb)68 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
69 {
70 unsigned long flags;
71 local_irq_save(flags);
72 netpoll_send_skb_on_dev(np, skb, np->dev);
73 local_irq_restore(flags);
74 }
75
76 #ifdef CONFIG_NETPOLL
netpoll_poll_lock(struct napi_struct * napi)77 static inline void *netpoll_poll_lock(struct napi_struct *napi)
78 {
79 struct net_device *dev = napi->dev;
80
81 if (dev && dev->npinfo) {
82 int owner = smp_processor_id();
83
84 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
85 cpu_relax();
86
87 return napi;
88 }
89 return NULL;
90 }
91
netpoll_poll_unlock(void * have)92 static inline void netpoll_poll_unlock(void *have)
93 {
94 struct napi_struct *napi = have;
95
96 if (napi)
97 smp_store_release(&napi->poll_owner, -1);
98 }
99
netpoll_tx_running(struct net_device * dev)100 static inline bool netpoll_tx_running(struct net_device *dev)
101 {
102 return irqs_disabled();
103 }
104
105 #else
netpoll_poll_lock(struct napi_struct * napi)106 static inline void *netpoll_poll_lock(struct napi_struct *napi)
107 {
108 return NULL;
109 }
netpoll_poll_unlock(void * have)110 static inline void netpoll_poll_unlock(void *have)
111 {
112 }
netpoll_netdev_init(struct net_device * dev)113 static inline void netpoll_netdev_init(struct net_device *dev)
114 {
115 }
netpoll_tx_running(struct net_device * dev)116 static inline bool netpoll_tx_running(struct net_device *dev)
117 {
118 return false;
119 }
120 #endif
121
122 #endif
123