/*

 * 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);

	u32 local_ip, remote_ip;

	u16 local_port, remote_port;

	u8 remote_mac[ETH_ALEN];

};

struct netpoll_info {

	atomic_t refcnt;

	int rx_flags;

	spinlock_t rx_lock;

	struct netpoll *rx_np; /* netpoll 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;

};

void netpoll_poll(struct netpoll *np);

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);

int netpoll_trap(void);

void netpoll_set_trap(int trap);

void netpoll_cleanup(struct netpoll *np);

int __netpoll_rx(struct sk_buff *skb);

#ifdef CONFIG_NETPOLL

static inline int netpoll_rx(struct sk_buff *skb)

{

	struct netpoll_info *npinfo = skb->dev->npinfo;

	unsigned long flags;

	int ret = 0;

	if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))

		return 0;

	spin_lock_irqsave(&npinfo->rx_lock, flags);

	/* check rx_flags again with the lock held */

	if (npinfo->rx_flags && __netpoll_rx(skb))

		ret = 1;

	spin_unlock_irqrestore(&npinfo->rx_lock, flags);

	return ret;

}

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;

	rcu_read_lock(); /* deal with race on ->npinfo */

	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);

	}

	rcu_read_unlock();

}

#else

static inline int netpoll_rx(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)

{

}

#endif

#endif