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
15union inet_addr {
16 __u32 all[4];
17 __be32 ip;
18 __be32 ip6[4];
19 struct in_addr in;
20 struct in6_addr in6;
21};
22
23struct netpoll {
24 struct net_device *dev;
25 char dev_name[IFNAMSIZ];
26 const char *name;
27 void (*rx_hook)(struct netpoll *, int, char *, int);
28
29 union inet_addr local_ip, remote_ip;
30 bool ipv6;
31 u16 local_port, remote_port;
32 u8 remote_mac[ETH_ALEN];
33
34 struct list_head rx; /* rx_np list element */
35 struct work_struct cleanup_work;
36};
37
38struct netpoll_info {
39 atomic_t refcnt;
40
41 unsigned long rx_flags;
42 spinlock_t rx_lock;
43 struct semaphore dev_lock;
44 struct list_head rx_np; /* netpolls that registered an rx_hook */
45
46 struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */
47 struct sk_buff_head txq;
48
49 struct delayed_work tx_work;
50
51 struct netpoll *netpoll;
52 struct rcu_head rcu;
53};
54
55#ifdef CONFIG_NETPOLL
56extern int netpoll_rx_disable(struct net_device *dev);
57extern void netpoll_rx_enable(struct net_device *dev);
58#else
59static inline int netpoll_rx_disable(struct net_device *dev) { return 0; }
60static inline void netpoll_rx_enable(struct net_device *dev) { return; }
61#endif
62
63void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
64void netpoll_print_options(struct netpoll *np);
65int netpoll_parse_options(struct netpoll *np, char *opt);
66int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
67int netpoll_setup(struct netpoll *np);
68int netpoll_trap(void);
69void netpoll_set_trap(int trap);
70void __netpoll_cleanup(struct netpoll *np);
71void __netpoll_free_async(struct netpoll *np);
72void netpoll_cleanup(struct netpoll *np);
73int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
74void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
75 struct net_device *dev);
76static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
77{
78 unsigned long flags;
79 local_irq_save(flags);
80 netpoll_send_skb_on_dev(np, skb, np->dev);
81 local_irq_restore(flags);
82}
83
84
85
86#ifdef CONFIG_NETPOLL
87static inline bool netpoll_rx_on(struct sk_buff *skb)
88{
89 struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
90
91 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
92}
93
94static inline bool netpoll_rx(struct sk_buff *skb)
95{
96 struct netpoll_info *npinfo;
97 unsigned long flags;
98 bool ret = false;
99
100 local_irq_save(flags);
101
102 if (!netpoll_rx_on(skb))
103 goto out;
104
105 npinfo = rcu_dereference_bh(skb->dev->npinfo);
106 spin_lock(&npinfo->rx_lock);
107 /* check rx_flags again with the lock held */
108 if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
109 ret = true;
110 spin_unlock(&npinfo->rx_lock);
111
112out:
113 local_irq_restore(flags);
114 return ret;
115}
116
117static inline int netpoll_receive_skb(struct sk_buff *skb)
118{
119 if (!list_empty(&skb->dev->napi_list))
120 return netpoll_rx(skb);
121 return 0;
122}
123
124static inline void *netpoll_poll_lock(struct napi_struct *napi)
125{
126 struct net_device *dev = napi->dev;
127
128 if (dev && dev->npinfo) {
129 spin_lock(&napi->poll_lock);
130 napi->poll_owner = smp_processor_id();
131 return napi;
132 }
133 return NULL;
134}
135
136static inline void netpoll_poll_unlock(void *have)
137{
138 struct napi_struct *napi = have;
139
140 if (napi) {
141 napi->poll_owner = -1;
142 spin_unlock(&napi->poll_lock);
143 }
144}
145
146static inline bool netpoll_tx_running(struct net_device *dev)
147{
148 return irqs_disabled();
149}
150
151#else
152static inline bool netpoll_rx(struct sk_buff *skb)
153{
154 return false;
155}
156static inline bool netpoll_rx_on(struct sk_buff *skb)
157{
158 return false;
159}
160static inline int netpoll_receive_skb(struct sk_buff *skb)
161{
162 return 0;
163}
164static inline void *netpoll_poll_lock(struct napi_struct *napi)
165{
166 return NULL;
167}
168static inline void netpoll_poll_unlock(void *have)
169{
170}
171static inline void netpoll_netdev_init(struct net_device *dev)
172{
173}
174static inline bool netpoll_tx_running(struct net_device *dev)
175{
176 return false;
177}
178#endif
179
180#endif