/* * 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(); } 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