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/rcupdate.h> 13 #include <linux/list.h> 14 15 struct netpoll { 16 struct net_device *dev; 17 char dev_name[IFNAMSIZ]; 18 const char *name; 19 void (*rx_hook)(struct netpoll *, int, char *, int); 20 21 u32 local_ip, remote_ip; 22 u16 local_port, remote_port; 23 u8 remote_mac[ETH_ALEN]; 24 }; 25 26 struct netpoll_info { 27 atomic_t refcnt; 28 spinlock_t rx_lock; 29 struct netpoll *rx_np; /* netpoll that registered an rx_hook */ 30 struct sk_buff_head arp_tx; /* list of arp requests to reply to */ 31 struct sk_buff_head txq; 32 struct delayed_work tx_work; 33 }; 34 35 void netpoll_poll(struct netpoll *np); 36 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 37 void netpoll_print_options(struct netpoll *np); 38 int netpoll_parse_options(struct netpoll *np, char *opt); 39 int netpoll_setup(struct netpoll *np); 40 int netpoll_trap(void); 41 void netpoll_set_trap(int trap); 42 void netpoll_cleanup(struct netpoll *np); 43 int __netpoll_rx(struct sk_buff *skb); 44 45 46 #ifdef CONFIG_NETPOLL 47 static inline int netpoll_rx(struct sk_buff *skb) 48 { 49 struct netpoll_info *npinfo = skb->dev->npinfo; 50 unsigned long flags; 51 int ret = 0; 52 53 if (!npinfo || !npinfo->rx_np) 54 return 0; 55 56 spin_lock_irqsave(&npinfo->rx_lock, flags); 57 /* check rx_np again with the lock held */ 58 if (npinfo->rx_np && __netpoll_rx(skb)) 59 ret = 1; 60 spin_unlock_irqrestore(&npinfo->rx_lock, flags); 61 62 return ret; 63 } 64 65 static inline int netpoll_receive_skb(struct sk_buff *skb) 66 { 67 if (!list_empty(&skb->dev->napi_list)) 68 return netpoll_rx(skb); 69 return 0; 70 } 71 72 static inline void *netpoll_poll_lock(struct napi_struct *napi) 73 { 74 struct net_device *dev = napi->dev; 75 76 rcu_read_lock(); /* deal with race on ->npinfo */ 77 if (dev && dev->npinfo) { 78 spin_lock(&napi->poll_lock); 79 napi->poll_owner = smp_processor_id(); 80 return napi; 81 } 82 return NULL; 83 } 84 85 static inline void netpoll_poll_unlock(void *have) 86 { 87 struct napi_struct *napi = have; 88 89 if (napi) { 90 napi->poll_owner = -1; 91 spin_unlock(&napi->poll_lock); 92 } 93 rcu_read_unlock(); 94 } 95 96 static inline void netpoll_netdev_init(struct net_device *dev) 97 { 98 INIT_LIST_HEAD(&dev->napi_list); 99 } 100 101 #else 102 static inline int netpoll_rx(struct sk_buff *skb) 103 { 104 return 0; 105 } 106 static inline int netpoll_receive_skb(struct sk_buff *skb) 107 { 108 return 0; 109 } 110 static inline void *netpoll_poll_lock(struct napi_struct *napi) 111 { 112 return NULL; 113 } 114 static inline void netpoll_poll_unlock(void *have) 115 { 116 } 117 static inline void netpoll_netdev_init(struct net_device *dev) 118 { 119 } 120 #endif 121 122 #endif 123