netpoll.h 3.34 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11
/*
 * 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>
12
#include <linux/rcupdate.h>
Linus Torvalds's avatar
Linus Torvalds committed
13 14 15 16
#include <linux/list.h>

struct netpoll {
	struct net_device *dev;
17 18
	char dev_name[IFNAMSIZ];
	const char *name;
Linus Torvalds's avatar
Linus Torvalds committed
19
	void (*rx_hook)(struct netpoll *, int, char *, int);
20

21
	__be32 local_ip, remote_ip;
Linus Torvalds's avatar
Linus Torvalds committed
22
	u16 local_port, remote_port;
23
	u8 remote_mac[ETH_ALEN];
24 25

	struct list_head rx; /* rx_np list element */
26 27 28
};

struct netpoll_info {
Stephen Hemminger's avatar
Stephen Hemminger committed
29
	atomic_t refcnt;
30

31
	int rx_flags;
32
	spinlock_t rx_lock;
33 34
	struct list_head rx_np; /* netpolls that registered an rx_hook */

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

	struct netpoll *netpoll;
Linus Torvalds's avatar
Linus Torvalds committed
41 42 43
};

void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
44
void netpoll_print_options(struct netpoll *np);
Linus Torvalds's avatar
Linus Torvalds committed
45
int netpoll_parse_options(struct netpoll *np, char *opt);
46
int __netpoll_setup(struct netpoll *np);
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49
int netpoll_setup(struct netpoll *np);
int netpoll_trap(void);
void netpoll_set_trap(int trap);
50
void __netpoll_cleanup(struct netpoll *np);
Linus Torvalds's avatar
Linus Torvalds committed
51 52
void netpoll_cleanup(struct netpoll *np);
int __netpoll_rx(struct sk_buff *skb);
53 54 55 56 57 58 59
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);
}

60

Linus Torvalds's avatar
Linus Torvalds committed
61 62

#ifdef CONFIG_NETPOLL
63
static inline bool netpoll_rx(struct sk_buff *skb)
Linus Torvalds's avatar
Linus Torvalds committed
64
{
Herbert Xu's avatar
Herbert Xu committed
65
	struct netpoll_info *npinfo;
66
	unsigned long flags;
67
	bool ret = false;
68

69
	local_irq_save(flags);
70
	npinfo = rcu_dereference_bh(skb->dev->npinfo);
Herbert Xu's avatar
Herbert Xu committed
71

72
	if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
Herbert Xu's avatar
Herbert Xu committed
73
		goto out;
74

75
	spin_lock(&npinfo->rx_lock);
76 77
	/* check rx_flags again with the lock held */
	if (npinfo->rx_flags && __netpoll_rx(skb))
78
		ret = true;
79
	spin_unlock(&npinfo->rx_lock);
80

Herbert Xu's avatar
Herbert Xu committed
81
out:
82
	local_irq_restore(flags);
83
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
84 85
}

86 87
static inline int netpoll_rx_on(struct sk_buff *skb)
{
88
	struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
89

90
	return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
91 92
}

93
static inline int netpoll_receive_skb(struct sk_buff *skb)
Linus Torvalds's avatar
Linus Torvalds committed
94
{
95 96 97 98 99 100 101 102 103 104 105 106 107
	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;
Linus Torvalds's avatar
Linus Torvalds committed
108
	}
109
	return NULL;
Linus Torvalds's avatar
Linus Torvalds committed
110 111
}

112
static inline void netpoll_poll_unlock(void *have)
Linus Torvalds's avatar
Linus Torvalds committed
113
{
114
	struct napi_struct *napi = have;
115

116 117 118
	if (napi) {
		napi->poll_owner = -1;
		spin_unlock(&napi->poll_lock);
Linus Torvalds's avatar
Linus Torvalds committed
119 120 121
	}
}

122 123 124 125 126
static inline int netpoll_tx_running(struct net_device *dev)
{
	return irqs_disabled();
}

Linus Torvalds's avatar
Linus Torvalds committed
127
#else
128
static inline bool netpoll_rx(struct sk_buff *skb)
129 130 131
{
	return 0;
}
132 133 134 135
static inline int netpoll_rx_on(struct sk_buff *skb)
{
	return 0;
}
136 137 138 139 140 141 142 143 144 145 146 147 148 149
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)
{
}
150 151 152 153
static inline int netpoll_tx_running(struct net_device *dev)
{
	return 0;
}
Linus Torvalds's avatar
Linus Torvalds committed
154 155 156
#endif

#endif