Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Common code for low-level network console, dump, and debugger code
3 *
4 * Derived from netconsole, kgdb-over-ethernet, and netdump patches
5 */
6
7#ifndef _LINUX_NETPOLL_H
8#define _LINUX_NETPOLL_H
9
10#include <linux/netdevice.h>
11#include <linux/interrupt.h>
12#include <linux/rcupdate.h>
13#include <linux/list.h>
14
15struct netpoll {
16 struct net_device *dev;
17 struct net_device *real_dev;
18 char dev_name[IFNAMSIZ];
19 const char *name;
20 void (*rx_hook)(struct netpoll *, int, char *, int);
21
22 __be32 local_ip, remote_ip;
23 u16 local_port, remote_port;
24 u8 remote_mac[ETH_ALEN];
25
26 struct list_head rx; /* rx_np list element */
27};
28
29struct netpoll_info {
30 atomic_t refcnt;
31
32 int rx_flags;
33 spinlock_t rx_lock;
34 struct list_head rx_np; /* netpolls that registered an rx_hook */
35
36 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
37 struct sk_buff_head txq;
38
39 struct delayed_work tx_work;
40
41 struct netpoll *netpoll;
42};
43
44void netpoll_poll_dev(struct net_device *dev);
45void netpoll_poll(struct netpoll *np);
46void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
47void netpoll_print_options(struct netpoll *np);
48int netpoll_parse_options(struct netpoll *np, char *opt);
49int __netpoll_setup(struct netpoll *np);
50int netpoll_setup(struct netpoll *np);
51int netpoll_trap(void);
52void netpoll_set_trap(int trap);
53void __netpoll_cleanup(struct netpoll *np);
54void netpoll_cleanup(struct netpoll *np);
55int __netpoll_rx(struct sk_buff *skb);
56void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
57
58
59#ifdef CONFIG_NETPOLL
60static inline bool netpoll_rx(struct sk_buff *skb)
61{
62 struct netpoll_info *npinfo;
63 unsigned long flags;
64 bool ret = false;
65
66 local_irq_save(flags);
67 npinfo = rcu_dereference_bh(skb->dev->npinfo);
68
69 if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
70 goto out;
71
72 spin_lock(&npinfo->rx_lock);
73 /* check rx_flags again with the lock held */
74 if (npinfo->rx_flags && __netpoll_rx(skb))
75 ret = true;
76 spin_unlock(&npinfo->rx_lock);
77
78out:
79 local_irq_restore(flags);
80 return ret;
81}
82
83static inline int netpoll_rx_on(struct sk_buff *skb)
84{
85 struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
86
87 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
88}
89
90static inline int netpoll_receive_skb(struct sk_buff *skb)
91{
92 if (!list_empty(&skb->dev->napi_list))
93 return netpoll_rx(skb);
94 return 0;
95}
96
97static inline void *netpoll_poll_lock(struct napi_struct *napi)
98{
99 struct net_device *dev = napi->dev;
100
101 if (dev && dev->npinfo) {
102 spin_lock(&napi->poll_lock);
103 napi->poll_owner = smp_processor_id();
104 return napi;
105 }
106 return NULL;
107}
108
109static inline void netpoll_poll_unlock(void *have)
110{
111 struct napi_struct *napi = have;
112
113 if (napi) {
114 napi->poll_owner = -1;
115 spin_unlock(&napi->poll_lock);
116 }
117}
118
119static inline int netpoll_tx_running(struct net_device *dev)
120{
121 return irqs_disabled();
122}
123
124#else
125static inline bool netpoll_rx(struct sk_buff *skb)
126{
127 return 0;
128}
129static inline int netpoll_rx_on(struct sk_buff *skb)
130{
131 return 0;
132}
133static inline int netpoll_receive_skb(struct sk_buff *skb)
134{
135 return 0;
136}
137static inline void *netpoll_poll_lock(struct napi_struct *napi)
138{
139 return NULL;
140}
141static inline void netpoll_poll_unlock(void *have)
142{
143}
144static inline void netpoll_netdev_init(struct net_device *dev)
145{
146}
147static inline int netpoll_tx_running(struct net_device *dev)
148{
149 return 0;
150}
151#endif
152
153#endif