1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* Common code for low-level network console, dump, and debugger code
*
* Derived from netconsole, kgdb-over-ethernet, and netdump patches
*/
#ifndef _LINUX_NETPOLL_H
#define _LINUX_NETPOLL_H
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
struct netpoll {
struct net_device *dev;
char dev_name[IFNAMSIZ];
const char *name;
void (*rx_hook)(struct netpoll *, int, char *, int);
__be32 local_ip, remote_ip;
u16 local_port, remote_port;
u8 remote_mac[ETH_ALEN];
struct list_head rx; /* rx_np list element */
struct rcu_head rcu;
};
struct netpoll_info {
atomic_t refcnt;
int rx_flags;
spinlock_t rx_lock;
struct list_head rx_np; /* netpolls that registered an rx_hook */
struct sk_buff_head arp_tx; /* list of arp requests to reply to */
struct sk_buff_head txq;
struct delayed_work tx_work;
struct netpoll *netpoll;
struct rcu_head rcu;
};
void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
void netpoll_print_options(struct netpoll *np);
int netpoll_parse_options(struct netpoll *np, char *opt);
int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
int netpoll_setup(struct netpoll *np);
int netpoll_trap(void);
void netpoll_set_trap(int trap);
void __netpoll_cleanup(struct netpoll *np);
void __netpoll_free_rcu(struct netpoll *np);
void netpoll_cleanup(struct netpoll *np);
int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
struct net_device *dev);
static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
{
netpoll_send_skb_on_dev(np, skb, np->dev);
}
#ifdef CONFIG_NETPOLL
static inline bool netpoll_rx(struct sk_buff *skb)
{
struct netpoll_info *npinfo;
unsigned long flags;
bool ret = false;
local_irq_save(flags);
npinfo = rcu_dereference_bh(skb->dev->npinfo);
if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
goto out;
spin_lock(&npinfo->rx_lock);
/* check rx_flags again with the lock held */
if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
ret = true;
spin_unlock(&npinfo->rx_lock);
out:
local_irq_restore(flags);
return ret;
}
static inline int netpoll_rx_on(struct sk_buff *skb)
{
struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
}
static inline int netpoll_receive_skb(struct sk_buff *skb)
{
if (!list_empty(&skb->dev->napi_list))
return netpoll_rx(skb);
return 0;
}
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
struct net_device *dev = napi->dev;
if (dev && dev->npinfo) {
spin_lock(&napi->poll_lock);
napi->poll_owner = smp_processor_id();
return napi;
}
return NULL;
}
static inline void netpoll_poll_unlock(void *have)
{
struct napi_struct *napi = have;
if (napi) {
napi->poll_owner = -1;
spin_unlock(&napi->poll_lock);
}
}
static inline int netpoll_tx_running(struct net_device *dev)
{
return irqs_disabled();
}
#else
static inline bool netpoll_rx(struct sk_buff *skb)
{
return 0;
}
static inline int netpoll_rx_on(struct sk_buff *skb)
{
return 0;
}
static inline int netpoll_receive_skb(struct sk_buff *skb)
{
return 0;
}
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
return NULL;
}
static inline void netpoll_poll_unlock(void *have)
{
}
static inline void netpoll_netdev_init(struct net_device *dev)
{
}
static inline int netpoll_tx_running(struct net_device *dev)
{
return 0;
}
#endif
#endif
|
