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 char dev_name[IFNAMSIZ];
19 void (*rx_hook)(struct netpoll *, int, char *, int);
21 __be32 local_ip, remote_ip;
22 u16 local_port, remote_port;
23 u8 remote_mac[ETH_ALEN];
25 struct list_head rx; /* rx_np list element */
33 struct list_head rx_np; /* netpolls that registered an rx_hook */
35 struct sk_buff_head arp_tx; /* list of arp requests to reply to */
36 struct sk_buff_head txq;
38 struct delayed_work tx_work;
41 void netpoll_poll(struct netpoll *np);
42 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
43 void netpoll_print_options(struct netpoll *np);
44 int netpoll_parse_options(struct netpoll *np, char *opt);
45 int netpoll_setup(struct netpoll *np);
46 int netpoll_trap(void);
47 void netpoll_set_trap(int trap);
48 void netpoll_cleanup(struct netpoll *np);
49 int __netpoll_rx(struct sk_buff *skb);
53 static inline int netpoll_rx(struct sk_buff *skb)
55 struct netpoll_info *npinfo = skb->dev->npinfo;
59 if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
62 spin_lock_irqsave(&npinfo->rx_lock, flags);
63 /* check rx_flags again with the lock held */
64 if (npinfo->rx_flags && __netpoll_rx(skb))
66 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
71 static inline int netpoll_rx_on(struct sk_buff *skb)
73 struct netpoll_info *npinfo = skb->dev->npinfo;
75 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
78 static inline int netpoll_receive_skb(struct sk_buff *skb)
80 if (!list_empty(&skb->dev->napi_list))
81 return netpoll_rx(skb);
85 static inline void *netpoll_poll_lock(struct napi_struct *napi)
87 struct net_device *dev = napi->dev;
89 rcu_read_lock(); /* deal with race on ->npinfo */
90 if (dev && dev->npinfo) {
91 spin_lock(&napi->poll_lock);
92 napi->poll_owner = smp_processor_id();
98 static inline void netpoll_poll_unlock(void *have)
100 struct napi_struct *napi = have;
103 napi->poll_owner = -1;
104 spin_unlock(&napi->poll_lock);
110 static inline int netpoll_rx(struct sk_buff *skb)
114 static inline int netpoll_rx_on(struct sk_buff *skb)
118 static inline int netpoll_receive_skb(struct sk_buff *skb)
122 static inline void *netpoll_poll_lock(struct napi_struct *napi)
126 static inline void netpoll_poll_unlock(void *have)
129 static inline void netpoll_netdev_init(struct net_device *dev)