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; 23bf6bce71SStephen Hemminger u8 local_mac[ETH_ALEN], 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); 381da177e4SLinus Torvalds int netpoll_parse_options(struct netpoll *np, char *opt); 391da177e4SLinus Torvalds int netpoll_setup(struct netpoll *np); 401da177e4SLinus Torvalds int netpoll_trap(void); 411da177e4SLinus Torvalds void netpoll_set_trap(int trap); 421da177e4SLinus Torvalds void netpoll_cleanup(struct netpoll *np); 431da177e4SLinus Torvalds int __netpoll_rx(struct sk_buff *skb); 445de4a473SStephen Hemminger 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds #ifdef CONFIG_NETPOLL 471da177e4SLinus Torvalds static inline int netpoll_rx(struct sk_buff *skb) 481da177e4SLinus Torvalds { 49115c1d6eSJeff Moyer struct netpoll_info *npinfo = skb->dev->npinfo; 50fbeec2e1SJeff Moyer unsigned long flags; 51fbeec2e1SJeff Moyer int ret = 0; 52115c1d6eSJeff Moyer 53fbeec2e1SJeff Moyer if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) 54115c1d6eSJeff Moyer return 0; 55115c1d6eSJeff Moyer 56fbeec2e1SJeff Moyer spin_lock_irqsave(&npinfo->rx_lock, flags); 57fbeec2e1SJeff Moyer /* check rx_flags again with the lock held */ 58fbeec2e1SJeff Moyer if (npinfo->rx_flags && __netpoll_rx(skb)) 59fbeec2e1SJeff Moyer ret = 1; 60fbeec2e1SJeff Moyer spin_unlock_irqrestore(&npinfo->rx_lock, flags); 61fbeec2e1SJeff Moyer 62fbeec2e1SJeff Moyer return ret; 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 65*bea3348eSStephen Hemminger static inline int netpoll_receive_skb(struct sk_buff *skb) 661da177e4SLinus Torvalds { 67*bea3348eSStephen Hemminger if (!list_empty(&skb->dev->napi_list)) 68*bea3348eSStephen Hemminger return netpoll_rx(skb); 69*bea3348eSStephen Hemminger return 0; 70*bea3348eSStephen Hemminger } 71*bea3348eSStephen Hemminger 72*bea3348eSStephen Hemminger static inline void *netpoll_poll_lock(struct napi_struct *napi) 73*bea3348eSStephen Hemminger { 74*bea3348eSStephen Hemminger struct net_device *dev = napi->dev; 75*bea3348eSStephen Hemminger 7653fb95d3SMatt Mackall rcu_read_lock(); /* deal with race on ->npinfo */ 77*bea3348eSStephen Hemminger if (dev && dev->npinfo) { 78*bea3348eSStephen Hemminger spin_lock(&napi->poll_lock); 79*bea3348eSStephen Hemminger napi->poll_owner = smp_processor_id(); 80*bea3348eSStephen Hemminger return napi; 811da177e4SLinus Torvalds } 8253fb95d3SMatt Mackall return NULL; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 8553fb95d3SMatt Mackall static inline void netpoll_poll_unlock(void *have) 861da177e4SLinus Torvalds { 87*bea3348eSStephen Hemminger struct napi_struct *napi = have; 8853fb95d3SMatt Mackall 89*bea3348eSStephen Hemminger if (napi) { 90*bea3348eSStephen Hemminger napi->poll_owner = -1; 91*bea3348eSStephen Hemminger spin_unlock(&napi->poll_lock); 921da177e4SLinus Torvalds } 9353fb95d3SMatt Mackall rcu_read_unlock(); 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 96*bea3348eSStephen Hemminger static inline void netpoll_netdev_init(struct net_device *dev) 97*bea3348eSStephen Hemminger { 98*bea3348eSStephen Hemminger INIT_LIST_HEAD(&dev->napi_list); 99*bea3348eSStephen Hemminger } 100*bea3348eSStephen Hemminger 1011da177e4SLinus Torvalds #else 102*bea3348eSStephen Hemminger static inline int netpoll_rx(struct sk_buff *skb) 103*bea3348eSStephen Hemminger { 104*bea3348eSStephen Hemminger return 0; 105*bea3348eSStephen Hemminger } 106*bea3348eSStephen Hemminger static inline int netpoll_receive_skb(struct sk_buff *skb) 107*bea3348eSStephen Hemminger { 108*bea3348eSStephen Hemminger return 0; 109*bea3348eSStephen Hemminger } 110*bea3348eSStephen Hemminger static inline void *netpoll_poll_lock(struct napi_struct *napi) 111*bea3348eSStephen Hemminger { 112*bea3348eSStephen Hemminger return NULL; 113*bea3348eSStephen Hemminger } 114*bea3348eSStephen Hemminger static inline void netpoll_poll_unlock(void *have) 115*bea3348eSStephen Hemminger { 116*bea3348eSStephen Hemminger } 117*bea3348eSStephen Hemminger static inline void netpoll_netdev_init(struct net_device *dev) 118*bea3348eSStephen Hemminger { 119*bea3348eSStephen Hemminger } 1201da177e4SLinus Torvalds #endif 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds #endif 123