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/*

 * 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 local_mac[ETH_ALEN], 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();

}

static inline void netpoll_netdev_init(struct net_device *dev)

{

        INIT_LIST_HEAD(&dev->napi_list);

}

#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