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 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
67
68 #ifdef CONFIG_NETPOLL
netpoll_poll_lock(struct napi_struct * napi)69 static inline void *netpoll_poll_lock(struct napi_struct *napi)
70 {
71 struct net_device *dev = napi->dev;
72
73 if (dev && dev->npinfo) {
74 int owner = smp_processor_id();
75
76 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
77 cpu_relax();
78
79 return napi;
80 }
81 return NULL;
82 }
83
netpoll_poll_unlock(void * have)84 static inline void netpoll_poll_unlock(void *have)
85 {
86 struct napi_struct *napi = have;
87
88 if (napi)
89 smp_store_release(&napi->poll_owner, -1);
90 }
91
netpoll_tx_running(struct net_device * dev)92 static inline bool netpoll_tx_running(struct net_device *dev)
93 {
94 return irqs_disabled();
95 }
96
97 #else
netpoll_poll_lock(struct napi_struct * napi)98 static inline void *netpoll_poll_lock(struct napi_struct *napi)
99 {
100 return NULL;
101 }
netpoll_poll_unlock(void * have)102 static inline void netpoll_poll_unlock(void *have)
103 {
104 }
netpoll_tx_running(struct net_device * dev)105 static inline bool netpoll_tx_running(struct net_device *dev)
106 {
107 return false;
108 }
109 #endif
110
111 #endif
112