1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Common code for low-level network console, dump, and debugger code
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Derived from netconsole, kgdb-over-ethernet, and netdump patches
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #ifndef _LINUX_NETPOLL_H
9*4882a593Smuzhiyun #define _LINUX_NETPOLL_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/netdevice.h>
12*4882a593Smuzhiyun #include <linux/interrupt.h>
13*4882a593Smuzhiyun #include <linux/rcupdate.h>
14*4882a593Smuzhiyun #include <linux/list.h>
15*4882a593Smuzhiyun #include <linux/refcount.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun union inet_addr {
18*4882a593Smuzhiyun __u32 all[4];
19*4882a593Smuzhiyun __be32 ip;
20*4882a593Smuzhiyun __be32 ip6[4];
21*4882a593Smuzhiyun struct in_addr in;
22*4882a593Smuzhiyun struct in6_addr in6;
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun struct netpoll {
26*4882a593Smuzhiyun struct net_device *dev;
27*4882a593Smuzhiyun char dev_name[IFNAMSIZ];
28*4882a593Smuzhiyun const char *name;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun union inet_addr local_ip, remote_ip;
31*4882a593Smuzhiyun bool ipv6;
32*4882a593Smuzhiyun u16 local_port, remote_port;
33*4882a593Smuzhiyun u8 remote_mac[ETH_ALEN];
34*4882a593Smuzhiyun };
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun struct netpoll_info {
37*4882a593Smuzhiyun refcount_t refcnt;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun struct semaphore dev_lock;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun struct sk_buff_head txq;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun struct delayed_work tx_work;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun struct netpoll *netpoll;
46*4882a593Smuzhiyun struct rcu_head rcu;
47*4882a593Smuzhiyun };
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun #ifdef CONFIG_NETPOLL
50*4882a593Smuzhiyun void netpoll_poll_dev(struct net_device *dev);
51*4882a593Smuzhiyun void netpoll_poll_disable(struct net_device *dev);
52*4882a593Smuzhiyun void netpoll_poll_enable(struct net_device *dev);
53*4882a593Smuzhiyun #else
netpoll_poll_disable(struct net_device * dev)54*4882a593Smuzhiyun static inline void netpoll_poll_disable(struct net_device *dev) { return; }
netpoll_poll_enable(struct net_device * dev)55*4882a593Smuzhiyun static inline void netpoll_poll_enable(struct net_device *dev) { return; }
56*4882a593Smuzhiyun #endif
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
59*4882a593Smuzhiyun void netpoll_print_options(struct netpoll *np);
60*4882a593Smuzhiyun int netpoll_parse_options(struct netpoll *np, char *opt);
61*4882a593Smuzhiyun int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
62*4882a593Smuzhiyun int netpoll_setup(struct netpoll *np);
63*4882a593Smuzhiyun void __netpoll_cleanup(struct netpoll *np);
64*4882a593Smuzhiyun void __netpoll_free(struct netpoll *np);
65*4882a593Smuzhiyun void netpoll_cleanup(struct netpoll *np);
66*4882a593Smuzhiyun netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun #ifdef CONFIG_NETPOLL
netpoll_poll_lock(struct napi_struct * napi)69*4882a593Smuzhiyun static inline void *netpoll_poll_lock(struct napi_struct *napi)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct net_device *dev = napi->dev;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (dev && dev->npinfo) {
74*4882a593Smuzhiyun int owner = smp_processor_id();
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
77*4882a593Smuzhiyun cpu_relax();
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun return napi;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun return NULL;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
netpoll_poll_unlock(void * have)84*4882a593Smuzhiyun static inline void netpoll_poll_unlock(void *have)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun struct napi_struct *napi = have;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun if (napi)
89*4882a593Smuzhiyun smp_store_release(&napi->poll_owner, -1);
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
netpoll_tx_running(struct net_device * dev)92*4882a593Smuzhiyun static inline bool netpoll_tx_running(struct net_device *dev)
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun return irqs_disabled();
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun #else
netpoll_poll_lock(struct napi_struct * napi)98*4882a593Smuzhiyun static inline void *netpoll_poll_lock(struct napi_struct *napi)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun return NULL;
101*4882a593Smuzhiyun }
netpoll_poll_unlock(void * have)102*4882a593Smuzhiyun static inline void netpoll_poll_unlock(void *have)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun }
netpoll_tx_running(struct net_device * dev)105*4882a593Smuzhiyun static inline bool netpoll_tx_running(struct net_device *dev)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun return false;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun #endif
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun #endif
112