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_hook
)(struct netpoll
*, int, char *, int);
29 union inet_addr local_ip
, remote_ip
;
31 u16 local_port
, remote_port
;
32 u8 remote_mac
[ETH_ALEN
];
34 struct list_head rx
; /* rx_np list element */
35 struct work_struct cleanup_work
;
41 unsigned long rx_flags
;
43 struct mutex dev_lock
;
44 struct list_head rx_np
; /* netpolls that registered an rx_hook */
46 struct sk_buff_head neigh_tx
; /* list of neigh requests to reply to */
47 struct sk_buff_head txq
;
49 struct delayed_work tx_work
;
51 struct netpoll
*netpoll
;
56 extern int netpoll_rx_disable(struct net_device
*dev
);
57 extern void netpoll_rx_enable(struct net_device
*dev
);
59 static inline int netpoll_rx_disable(struct net_device
*dev
) { return 0; }
60 static inline void netpoll_rx_enable(struct net_device
*dev
) { return; }
63 void netpoll_send_udp(struct netpoll
*np
, const char *msg
, int len
);
64 void netpoll_print_options(struct netpoll
*np
);
65 int netpoll_parse_options(struct netpoll
*np
, char *opt
);
66 int __netpoll_setup(struct netpoll
*np
, struct net_device
*ndev
, gfp_t gfp
);
67 int netpoll_setup(struct netpoll
*np
);
68 int netpoll_trap(void);
69 void netpoll_set_trap(int trap
);
70 void __netpoll_cleanup(struct netpoll
*np
);
71 void __netpoll_free_async(struct netpoll
*np
);
72 void netpoll_cleanup(struct netpoll
*np
);
73 int __netpoll_rx(struct sk_buff
*skb
, struct netpoll_info
*npinfo
);
74 void netpoll_send_skb_on_dev(struct netpoll
*np
, struct sk_buff
*skb
,
75 struct net_device
*dev
);
76 static inline void netpoll_send_skb(struct netpoll
*np
, struct sk_buff
*skb
)
79 local_irq_save(flags
);
80 netpoll_send_skb_on_dev(np
, skb
, np
->dev
);
81 local_irq_restore(flags
);
87 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
89 struct netpoll_info
*npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
91 return npinfo
&& (!list_empty(&npinfo
->rx_np
) || npinfo
->rx_flags
);
94 static inline bool netpoll_rx(struct sk_buff
*skb
)
96 struct netpoll_info
*npinfo
;
100 local_irq_save(flags
);
102 if (!netpoll_rx_on(skb
))
105 npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
106 spin_lock(&npinfo
->rx_lock
);
107 /* check rx_flags again with the lock held */
108 if (npinfo
->rx_flags
&& __netpoll_rx(skb
, npinfo
))
110 spin_unlock(&npinfo
->rx_lock
);
113 local_irq_restore(flags
);
117 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
119 if (!list_empty(&skb
->dev
->napi_list
))
120 return netpoll_rx(skb
);
124 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
126 struct net_device
*dev
= napi
->dev
;
128 if (dev
&& dev
->npinfo
) {
129 spin_lock(&napi
->poll_lock
);
130 napi
->poll_owner
= smp_processor_id();
136 static inline void netpoll_poll_unlock(void *have
)
138 struct napi_struct
*napi
= have
;
141 napi
->poll_owner
= -1;
142 spin_unlock(&napi
->poll_lock
);
146 static inline bool netpoll_tx_running(struct net_device
*dev
)
148 return irqs_disabled();
152 static inline bool netpoll_rx(struct sk_buff
*skb
)
156 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
160 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
164 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
168 static inline void netpoll_poll_unlock(void *have
)
171 static inline void netpoll_netdev_init(struct net_device
*dev
)
174 static inline bool netpoll_tx_running(struct net_device
*dev
)