1 /* 2 * Common code for low-level network console, dump, and debugger code 3 * 4 * Derived from netconsole, kgdb-over-ethernet, and netdump patches 5 */ 6 7 #ifndef _LINUX_NETPOLL_H 8 #define _LINUX_NETPOLL_H 9 10 #include <linux/netdevice.h> 11 #include <linux/interrupt.h> 12 #include <linux/list.h> 13 14 struct netpoll; 15 16 struct netpoll { 17 struct net_device *dev; 18 char dev_name[16], *name; 19 void (*rx_hook)(struct netpoll *, int, char *, int); 20 void (*drop)(struct sk_buff *skb); 21 u32 local_ip, remote_ip; 22 u16 local_port, remote_port; 23 unsigned char local_mac[6], remote_mac[6]; 24 }; 25 26 struct netpoll_info { 27 spinlock_t poll_lock; 28 int poll_owner; 29 int rx_flags; 30 spinlock_t rx_lock; 31 struct netpoll *rx_np; /* netpoll that registered an rx_hook */ 32 }; 33 34 void netpoll_poll(struct netpoll *np); 35 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 36 int netpoll_parse_options(struct netpoll *np, char *opt); 37 int netpoll_setup(struct netpoll *np); 38 int netpoll_trap(void); 39 void netpoll_set_trap(int trap); 40 void netpoll_cleanup(struct netpoll *np); 41 int __netpoll_rx(struct sk_buff *skb); 42 void netpoll_queue(struct sk_buff *skb); 43 44 #ifdef CONFIG_NETPOLL 45 static inline int netpoll_rx(struct sk_buff *skb) 46 { 47 struct netpoll_info *npinfo = skb->dev->npinfo; 48 unsigned long flags; 49 int ret = 0; 50 51 if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) 52 return 0; 53 54 spin_lock_irqsave(&npinfo->rx_lock, flags); 55 /* check rx_flags again with the lock held */ 56 if (npinfo->rx_flags && __netpoll_rx(skb)) 57 ret = 1; 58 spin_unlock_irqrestore(&npinfo->rx_lock, flags); 59 60 return ret; 61 } 62 63 static inline void netpoll_poll_lock(struct net_device *dev) 64 { 65 if (dev->npinfo) { 66 spin_lock(&dev->npinfo->poll_lock); 67 dev->npinfo->poll_owner = smp_processor_id(); 68 } 69 } 70 71 static inline void netpoll_poll_unlock(struct net_device *dev) 72 { 73 if (dev->npinfo) { 74 dev->npinfo->poll_owner = -1; 75 spin_unlock(&dev->npinfo->poll_lock); 76 } 77 } 78 79 #else 80 #define netpoll_rx(a) 0 81 #define netpoll_poll_lock(a) 82 #define netpoll_poll_unlock(a) 83 #endif 84 85 #endif 86