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 char dev_name[IFNAMSIZ];
18 const char *name;
19 void (*rx_hook)(struct netpoll *, int, char *, int);
20
21 __be32 local_ip, remote_ip;
22 u16 local_port, remote_port;
23 u8 remote_mac[ETH_ALEN];
24
25 struct list_head rx; /* rx_np list element */
26};
27
28struct netpoll_info {
29 atomic_t refcnt;
30
31 int rx_flags;
32 spinlock_t rx_lock;
33 struct list_head rx_np; /* netpolls that registered an rx_hook */
34
35 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
36 struct sk_buff_head txq;
37
38 struct delayed_work tx_work;
39};
40
41void netpoll_poll(struct netpoll *np);
42void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
43void netpoll_print_options(struct netpoll *np);
44int netpoll_parse_options(struct netpoll *np, char *opt);
45int netpoll_setup(struct netpoll *np);
46int netpoll_trap(void);
47void netpoll_set_trap(int trap);
48void netpoll_cleanup(struct netpoll *np);
49int __netpoll_rx(struct sk_buff *skb);
50
51
52#ifdef CONFIG_NETPOLL
53static inline int netpoll_rx(struct sk_buff *skb)
54{
55 struct netpoll_info *npinfo = skb->dev->npinfo;
56 unsigned long flags;
57 int ret = 0;
58
59 if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
60 return 0;
61
62 spin_lock_irqsave(&npinfo->rx_lock, flags);
63 /* check rx_flags again with the lock held */
64 if (npinfo->rx_flags && __netpoll_rx(skb))
65 ret = 1;
66 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
67
68 return ret;
69}
70
71static inline int netpoll_rx_on(struct sk_buff *skb)
72{
73 struct netpoll_info *npinfo = skb->dev->npinfo;
74
75 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
76}
77
78static inline int netpoll_receive_skb(struct sk_buff *skb)
79{
80 if (!list_empty(&skb->dev->napi_list))
81 return netpoll_rx(skb);
82 return 0;
83}
84
85static inline void *netpoll_poll_lock(struct napi_struct *napi)
86{
87 struct net_device *dev = napi->dev;
88
89 rcu_read_lock(); /* deal with race on ->npinfo */
90 if (dev && dev->npinfo) {
91 spin_lock(&napi->poll_lock);
92 napi->poll_owner = smp_processor_id();
93 return napi;
94 }
95 return NULL;
96}
97
98static inline void netpoll_poll_unlock(void *have)
99{
100 struct napi_struct *napi = have;
101
102 if (napi) {
103 napi->poll_owner = -1;
104 spin_unlock(&napi->poll_lock);
105 }
106 rcu_read_unlock();
107}
108
109#else
110static inline int netpoll_rx(struct sk_buff *skb)
111{
112 return 0;
113}
114static inline int netpoll_rx_on(struct sk_buff *skb)
115{
116 return 0;
117}
118static inline int netpoll_receive_skb(struct sk_buff *skb)
119{
120 return 0;
121}
122static inline void *netpoll_poll_lock(struct napi_struct *napi)
123{
124 return NULL;
125}
126static inline void netpoll_poll_unlock(void *have)
127{
128}
129static inline void netpoll_netdev_init(struct net_device *dev)
130{
131}
132#endif
133
134#endif