11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Common code for low-level network console, dump, and debugger code 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Derived from netconsole, kgdb-over-ethernet, and netdump patches 51da177e4SLinus Torvalds */ 61da177e4SLinus Torvalds 71da177e4SLinus Torvalds #ifndef _LINUX_NETPOLL_H 81da177e4SLinus Torvalds #define _LINUX_NETPOLL_H 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/netdevice.h> 111da177e4SLinus Torvalds #include <linux/interrupt.h> 1253fb95d3SMatt Mackall #include <linux/rcupdate.h> 131da177e4SLinus Torvalds #include <linux/list.h> 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds struct netpoll { 161da177e4SLinus Torvalds struct net_device *dev; 17bf6bce71SStephen Hemminger char dev_name[IFNAMSIZ]; 18bf6bce71SStephen Hemminger const char *name; 191da177e4SLinus Torvalds void (*rx_hook)(struct netpoll *, int, char *, int); 205de4a473SStephen Hemminger 211da177e4SLinus Torvalds u32 local_ip, remote_ip; 221da177e4SLinus Torvalds u16 local_port, remote_port; 23*09538641SStephen Hemminger u8 remote_mac[ETH_ALEN]; 24115c1d6eSJeff Moyer }; 25115c1d6eSJeff Moyer 26115c1d6eSJeff Moyer struct netpoll_info { 2793ec2c72SStephen Hemminger atomic_t refcnt; 28115c1d6eSJeff Moyer int rx_flags; 29fbeec2e1SJeff Moyer spinlock_t rx_lock; 30fbeec2e1SJeff Moyer struct netpoll *rx_np; /* netpoll that registered an rx_hook */ 31068c6e98SNeil Horman struct sk_buff_head arp_tx; /* list of arp requests to reply to */ 32b6cd27edSStephen Hemminger struct sk_buff_head txq; 336d5aefb8SDavid Howells struct delayed_work tx_work; 341da177e4SLinus Torvalds }; 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds void netpoll_poll(struct netpoll *np); 371da177e4SLinus Torvalds void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 380bcc1816SSatyam Sharma void netpoll_print_options(struct netpoll *np); 391da177e4SLinus Torvalds int netpoll_parse_options(struct netpoll *np, char *opt); 401da177e4SLinus Torvalds int netpoll_setup(struct netpoll *np); 411da177e4SLinus Torvalds int netpoll_trap(void); 421da177e4SLinus Torvalds void netpoll_set_trap(int trap); 431da177e4SLinus Torvalds void netpoll_cleanup(struct netpoll *np); 441da177e4SLinus Torvalds int __netpoll_rx(struct sk_buff *skb); 455de4a473SStephen Hemminger 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef CONFIG_NETPOLL 481da177e4SLinus Torvalds static inline int netpoll_rx(struct sk_buff *skb) 491da177e4SLinus Torvalds { 50115c1d6eSJeff Moyer struct netpoll_info *npinfo = skb->dev->npinfo; 51fbeec2e1SJeff Moyer unsigned long flags; 52fbeec2e1SJeff Moyer int ret = 0; 53115c1d6eSJeff Moyer 54fbeec2e1SJeff Moyer if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) 55115c1d6eSJeff Moyer return 0; 56115c1d6eSJeff Moyer 57fbeec2e1SJeff Moyer spin_lock_irqsave(&npinfo->rx_lock, flags); 58fbeec2e1SJeff Moyer /* check rx_flags again with the lock held */ 59fbeec2e1SJeff Moyer if (npinfo->rx_flags && __netpoll_rx(skb)) 60fbeec2e1SJeff Moyer ret = 1; 61fbeec2e1SJeff Moyer spin_unlock_irqrestore(&npinfo->rx_lock, flags); 62fbeec2e1SJeff Moyer 63fbeec2e1SJeff Moyer return ret; 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 66bea3348eSStephen Hemminger static inline int netpoll_receive_skb(struct sk_buff *skb) 671da177e4SLinus Torvalds { 68bea3348eSStephen Hemminger if (!list_empty(&skb->dev->napi_list)) 69bea3348eSStephen Hemminger return netpoll_rx(skb); 70bea3348eSStephen Hemminger return 0; 71bea3348eSStephen Hemminger } 72bea3348eSStephen Hemminger 73bea3348eSStephen Hemminger static inline void *netpoll_poll_lock(struct napi_struct *napi) 74bea3348eSStephen Hemminger { 75bea3348eSStephen Hemminger struct net_device *dev = napi->dev; 76bea3348eSStephen Hemminger 7753fb95d3SMatt Mackall rcu_read_lock(); /* deal with race on ->npinfo */ 78bea3348eSStephen Hemminger if (dev && dev->npinfo) { 79bea3348eSStephen Hemminger spin_lock(&napi->poll_lock); 80bea3348eSStephen Hemminger napi->poll_owner = smp_processor_id(); 81bea3348eSStephen Hemminger return napi; 821da177e4SLinus Torvalds } 8353fb95d3SMatt Mackall return NULL; 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 8653fb95d3SMatt Mackall static inline void netpoll_poll_unlock(void *have) 871da177e4SLinus Torvalds { 88bea3348eSStephen Hemminger struct napi_struct *napi = have; 8953fb95d3SMatt Mackall 90bea3348eSStephen Hemminger if (napi) { 91bea3348eSStephen Hemminger napi->poll_owner = -1; 92bea3348eSStephen Hemminger spin_unlock(&napi->poll_lock); 931da177e4SLinus Torvalds } 9453fb95d3SMatt Mackall rcu_read_unlock(); 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 97bea3348eSStephen Hemminger static inline void netpoll_netdev_init(struct net_device *dev) 98bea3348eSStephen Hemminger { 99bea3348eSStephen Hemminger INIT_LIST_HEAD(&dev->napi_list); 100bea3348eSStephen Hemminger } 101bea3348eSStephen Hemminger 1021da177e4SLinus Torvalds #else 103bea3348eSStephen Hemminger static inline int netpoll_rx(struct sk_buff *skb) 104bea3348eSStephen Hemminger { 105bea3348eSStephen Hemminger return 0; 106bea3348eSStephen Hemminger } 107bea3348eSStephen Hemminger static inline int netpoll_receive_skb(struct sk_buff *skb) 108bea3348eSStephen Hemminger { 109bea3348eSStephen Hemminger return 0; 110bea3348eSStephen Hemminger } 111bea3348eSStephen Hemminger static inline void *netpoll_poll_lock(struct napi_struct *napi) 112bea3348eSStephen Hemminger { 113bea3348eSStephen Hemminger return NULL; 114bea3348eSStephen Hemminger } 115bea3348eSStephen Hemminger static inline void netpoll_poll_unlock(void *have) 116bea3348eSStephen Hemminger { 117bea3348eSStephen Hemminger } 118bea3348eSStephen Hemminger static inline void netpoll_netdev_init(struct net_device *dev) 119bea3348eSStephen Hemminger { 120bea3348eSStephen Hemminger } 1211da177e4SLinus Torvalds #endif 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds #endif 124