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>
24 struct net_device *dev;
25 char dev_name[IFNAMSIZ];
27 void (*rx_skb_hook)(struct netpoll *np, int source, struct sk_buff *skb,
30 union inet_addr local_ip, remote_ip;
32 u16 local_port, remote_port;
33 u8 remote_mac[ETH_ALEN];
35 struct list_head rx; /* rx_np list element */
36 struct work_struct cleanup_work;
42 unsigned long rx_flags;
44 struct semaphore dev_lock;
45 struct list_head rx_np; /* netpolls that registered an rx_skb_hook */
47 struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */
48 struct sk_buff_head txq;
50 struct delayed_work tx_work;
52 struct netpoll *netpoll;
57 extern void netpoll_rx_disable(struct net_device *dev);
58 extern void netpoll_rx_enable(struct net_device *dev);
60 static inline void netpoll_rx_disable(struct net_device *dev) { return; }
61 static inline void netpoll_rx_enable(struct net_device *dev) { return; }
64 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
65 void netpoll_print_options(struct netpoll *np);
66 int netpoll_parse_options(struct netpoll *np, char *opt);
67 int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
68 int netpoll_setup(struct netpoll *np);
69 int netpoll_trap(void);
70 void netpoll_set_trap(int trap);
71 void __netpoll_cleanup(struct netpoll *np);
72 void __netpoll_free_async(struct netpoll *np);
73 void netpoll_cleanup(struct netpoll *np);
74 int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
75 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
76 struct net_device *dev);
77 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
80 local_irq_save(flags);
81 netpoll_send_skb_on_dev(np, skb, np->dev);
82 local_irq_restore(flags);
85 #ifdef CONFIG_NETPOLL_TRAP
86 static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
88 return !list_empty(&npinfo->rx_np);
91 static inline bool netpoll_rx_processing(struct netpoll_info *npinfo)
98 static inline bool netpoll_rx_on(struct sk_buff *skb)
100 struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
102 return npinfo && (netpoll_rx_processing(npinfo) || npinfo->rx_flags);
105 static inline bool netpoll_rx(struct sk_buff *skb)
107 struct netpoll_info *npinfo;
111 local_irq_save(flags);
113 if (!netpoll_rx_on(skb))
116 npinfo = rcu_dereference_bh(skb->dev->npinfo);
117 spin_lock(&npinfo->rx_lock);
118 /* check rx_processing again with the lock held */
119 if (netpoll_rx_processing(npinfo) && __netpoll_rx(skb, npinfo))
121 spin_unlock(&npinfo->rx_lock);
124 local_irq_restore(flags);
128 static inline int netpoll_receive_skb(struct sk_buff *skb)
130 if (!list_empty(&skb->dev->napi_list))
131 return netpoll_rx(skb);
135 static inline void *netpoll_poll_lock(struct napi_struct *napi)
137 struct net_device *dev = napi->dev;
139 if (dev && dev->npinfo) {
140 spin_lock(&napi->poll_lock);
141 napi->poll_owner = smp_processor_id();
147 static inline void netpoll_poll_unlock(void *have)
149 struct napi_struct *napi = have;
152 napi->poll_owner = -1;
153 spin_unlock(&napi->poll_lock);
157 static inline bool netpoll_tx_running(struct net_device *dev)
159 return irqs_disabled();
163 static inline bool netpoll_rx(struct sk_buff *skb)
167 static inline bool netpoll_rx_on(struct sk_buff *skb)
171 static inline int netpoll_receive_skb(struct sk_buff *skb)
175 static inline void *netpoll_poll_lock(struct napi_struct *napi)
179 static inline void netpoll_poll_unlock(void *have)
182 static inline void netpoll_netdev_init(struct net_device *dev)
185 static inline bool netpoll_tx_running(struct net_device *dev)