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 struct sk_buff_head skb_pool;
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(struct netpoll *np);
67 void netpoll_cleanup(struct netpoll *np);
68 void do_netpoll_cleanup(struct netpoll *np);
69 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
70
71 #ifdef CONFIG_NETPOLL
netpoll_poll_lock(struct napi_struct * napi)72 static 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
netpoll_poll_unlock(void * have)87 static 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
netpoll_tx_running(struct net_device * dev)95 static inline bool netpoll_tx_running(struct net_device *dev)
96 {
97 return irqs_disabled();
98 }
99
100 #else
netpoll_poll_lock(struct napi_struct * napi)101 static inline void *netpoll_poll_lock(struct napi_struct *napi)
102 {
103 return NULL;
104 }
netpoll_poll_unlock(void * have)105 static inline void netpoll_poll_unlock(void *have)
106 {
107 }
netpoll_tx_running(struct net_device * dev)108 static inline bool netpoll_tx_running(struct net_device *dev)
109 {
110 return false;
111 }
112 #endif
113
114 #endif
115