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