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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;
- spinlock_t poll_lock;
- int poll_owner;
- 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);
- 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 void *netpoll_poll_lock(struct net_device *dev)
- {
- rcu_read_lock(); /* deal with race on ->npinfo */
- if (dev->npinfo) {
- spin_lock(&dev->npinfo->poll_lock);
- dev->npinfo->poll_owner = smp_processor_id();
- return dev->npinfo;
- }
- return NULL;
- }
- static inline void netpoll_poll_unlock(void *have)
- {
- struct netpoll_info *npi = have;
- if (npi) {
- npi->poll_owner = -1;
- spin_unlock(&npi->poll_lock);
- }
- rcu_read_unlock();
- }
- #else
- #define netpoll_rx(a) 0
- #define netpoll_poll_lock(a) NULL
- #define netpoll_poll_unlock(a)
- #endif
- #endif
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