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 struct rcu_head rcu;
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 struct rcu_head rcu;
43};
44
45void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
46void netpoll_print_options(struct netpoll *np);
47int netpoll_parse_options(struct netpoll *np, char *opt);
48int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
49int netpoll_setup(struct netpoll *np);
50int netpoll_trap(void);
51void netpoll_set_trap(int trap);
52void __netpoll_cleanup(struct netpoll *np);
53void __netpoll_free_rcu(struct netpoll *np);
54void netpoll_cleanup(struct netpoll *np);
55int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
56void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
57 struct net_device *dev);
58static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
59{
60 unsigned long flags;
61 local_irq_save(flags);
62 netpoll_send_skb_on_dev(np, skb, np->dev);
63 local_irq_restore(flags);
64}
65
66
67
68#ifdef CONFIG_NETPOLL
69static inline bool netpoll_rx_on(struct sk_buff *skb)
70{
71 struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
72
73 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
74}
75
76static inline bool netpoll_rx(struct sk_buff *skb)
77{
78 struct netpoll_info *npinfo;
79 unsigned long flags;
80 bool ret = false;
81
82 local_irq_save(flags);
83
84 if (!netpoll_rx_on(skb))
85 goto out;
86
87 npinfo = rcu_dereference_bh(skb->dev->npinfo);
88 spin_lock(&npinfo->rx_lock);
89 /* check rx_flags again with the lock held */
90 if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
91 ret = true;
92 spin_unlock(&npinfo->rx_lock);
93
94out:
95 local_irq_restore(flags);
96 return ret;
97}
98
99static inline int netpoll_receive_skb(struct sk_buff *skb)
100{
101 if (!list_empty(&skb->dev->napi_list))
102 return netpoll_rx(skb);
103 return 0;
104}
105
106static inline void *netpoll_poll_lock(struct napi_struct *napi)
107{
108 struct net_device *dev = napi->dev;
109
110 if (dev && dev->npinfo) {
111 spin_lock(&napi->poll_lock);
112 napi->poll_owner = smp_processor_id();
113 return napi;
114 }
115 return NULL;
116}
117
118static inline void netpoll_poll_unlock(void *have)
119{
120 struct napi_struct *napi = have;
121
122 if (napi) {
123 napi->poll_owner = -1;
124 spin_unlock(&napi->poll_lock);
125 }
126}
127
128static inline bool netpoll_tx_running(struct net_device *dev)
129{
130 return irqs_disabled();
131}
132
133#else
134static inline bool netpoll_rx(struct sk_buff *skb)
135{
136 return false;
137}
138static inline bool netpoll_rx_on(struct sk_buff *skb)
139{
140 return false;
141}
142static inline int netpoll_receive_skb(struct sk_buff *skb)
143{
144 return 0;
145}
146static inline void *netpoll_poll_lock(struct napi_struct *napi)
147{
148 return NULL;
149}
150static inline void netpoll_poll_unlock(void *have)
151{
152}
153static inline void netpoll_netdev_init(struct net_device *dev)
154{
155}
156static inline bool netpoll_tx_running(struct net_device *dev)
157{
158 return false;
159}
160#endif
161
162#endif