2 * Common code for low-level network console, dump, and debugger code
4 * Derived from netconsole, kgdb-over-ethernet, and netdump patches
7 #ifndef _LINUX_NETPOLL_H
8 #define _LINUX_NETPOLL_H
10 #include <linux/netdevice.h>
11 #include <linux/interrupt.h>
12 #include <linux/rcupdate.h>
13 #include <linux/list.h>
16 struct net_device *dev;
17 struct net_device *real_dev;
18 char dev_name[IFNAMSIZ];
20 void (*rx_hook)(struct netpoll *, int, char *, int);
22 __be32 local_ip, remote_ip;
23 u16 local_port, remote_port;
24 u8 remote_mac[ETH_ALEN];
26 struct list_head rx; /* rx_np list element */
34 struct list_head rx_np; /* netpolls that registered an rx_hook */
36 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
37 struct sk_buff_head txq;
39 struct delayed_work tx_work;
41 struct netpoll *netpoll;
44 void netpoll_poll_dev(struct net_device *dev);
45 void netpoll_poll(struct netpoll *np);
46 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
47 void netpoll_print_options(struct netpoll *np);
48 int netpoll_parse_options(struct netpoll *np, char *opt);
49 int netpoll_setup(struct netpoll *np);
50 int netpoll_trap(void);
51 void netpoll_set_trap(int trap);
52 void netpoll_cleanup(struct netpoll *np);
53 int __netpoll_rx(struct sk_buff *skb);
54 void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
58 static inline bool netpoll_rx(struct sk_buff *skb)
60 struct netpoll_info *npinfo = skb->dev->npinfo;
64 if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
67 spin_lock_irqsave(&npinfo->rx_lock, flags);
68 /* check rx_flags again with the lock held */
69 if (npinfo->rx_flags && __netpoll_rx(skb))
71 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
76 static inline int netpoll_rx_on(struct sk_buff *skb)
78 struct netpoll_info *npinfo = skb->dev->npinfo;
80 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
83 static inline int netpoll_receive_skb(struct sk_buff *skb)
85 if (!list_empty(&skb->dev->napi_list))
86 return netpoll_rx(skb);
90 static inline void *netpoll_poll_lock(struct napi_struct *napi)
92 struct net_device *dev = napi->dev;
94 rcu_read_lock(); /* deal with race on ->npinfo */
95 if (dev && dev->npinfo) {
96 spin_lock(&napi->poll_lock);
97 napi->poll_owner = smp_processor_id();
103 static inline void netpoll_poll_unlock(void *have)
105 struct napi_struct *napi = have;
108 napi->poll_owner = -1;
109 spin_unlock(&napi->poll_lock);
115 static inline int netpoll_rx(struct sk_buff *skb)
119 static inline int netpoll_rx_on(struct sk_buff *skb)
123 static inline int netpoll_receive_skb(struct sk_buff *skb)
127 static inline void *netpoll_poll_lock(struct napi_struct *napi)
131 static inline void netpoll_poll_unlock(void *have)
134 static inline void netpoll_netdev_init(struct net_device *dev)