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 */
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;
45 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
46 void netpoll_print_options(struct netpoll *np);
47 int netpoll_parse_options(struct netpoll *np, char *opt);
48 int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
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 void __netpoll_free_rcu(struct netpoll *np);
54 void netpoll_cleanup(struct netpoll *np);
55 int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
56 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
57 struct net_device *dev);
58 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
60 netpoll_send_skb_on_dev(np, skb, np->dev);
66 static inline int netpoll_rx_on(struct sk_buff *skb)
68 struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
70 return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
73 static inline bool netpoll_rx(struct sk_buff *skb)
75 struct netpoll_info *npinfo;
79 local_irq_save(flags);
81 if (!netpoll_rx_on(skb))
84 npinfo = rcu_dereference_bh(skb->dev->npinfo);
85 spin_lock(&npinfo->rx_lock);
86 /* check rx_flags again with the lock held */
87 if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
89 spin_unlock(&npinfo->rx_lock);
92 local_irq_restore(flags);
96 static inline int netpoll_receive_skb(struct sk_buff *skb)
98 if (!list_empty(&skb->dev->napi_list))
99 return netpoll_rx(skb);
103 static inline void *netpoll_poll_lock(struct napi_struct *napi)
105 struct net_device *dev = napi->dev;
107 if (dev && dev->npinfo) {
108 spin_lock(&napi->poll_lock);
109 napi->poll_owner = smp_processor_id();
115 static inline void netpoll_poll_unlock(void *have)
117 struct napi_struct *napi = have;
120 napi->poll_owner = -1;
121 spin_unlock(&napi->poll_lock);
125 static inline int netpoll_tx_running(struct net_device *dev)
127 return irqs_disabled();
131 static inline bool netpoll_rx(struct sk_buff *skb)
135 static inline int netpoll_rx_on(struct sk_buff *skb)
139 static inline int netpoll_receive_skb(struct sk_buff *skb)
143 static inline void *netpoll_poll_lock(struct napi_struct *napi)
147 static inline void netpoll_poll_unlock(void *have)
150 static inline void netpoll_netdev_init(struct net_device *dev)
153 static inline int netpoll_tx_running(struct net_device *dev)