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
);
88 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
90 struct netpoll_info
*npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
92 return npinfo
&& (!list_empty(&npinfo
->rx_np
) || npinfo
->rx_flags
);
95 static inline bool netpoll_rx(struct sk_buff
*skb
)
97 struct netpoll_info
*npinfo
;
101 local_irq_save(flags
);
103 if (!netpoll_rx_on(skb
))
106 npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
107 spin_lock(&npinfo
->rx_lock
);
108 /* check rx_flags again with the lock held */
109 if (npinfo
->rx_flags
&& __netpoll_rx(skb
, npinfo
))
111 spin_unlock(&npinfo
->rx_lock
);
114 local_irq_restore(flags
);
118 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
120 if (!list_empty(&skb
->dev
->napi_list
))
121 return netpoll_rx(skb
);
125 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
127 struct net_device
*dev
= napi
->dev
;
129 if (dev
&& dev
->npinfo
) {
130 spin_lock(&napi
->poll_lock
);
131 napi
->poll_owner
= smp_processor_id();
137 static inline void netpoll_poll_unlock(void *have
)
139 struct napi_struct
*napi
= have
;
142 napi
->poll_owner
= -1;
143 spin_unlock(&napi
->poll_lock
);
147 static inline bool netpoll_tx_running(struct net_device
*dev
)
149 return irqs_disabled();
153 static inline bool netpoll_rx(struct sk_buff
*skb
)
157 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
161 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
165 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
169 static inline void netpoll_poll_unlock(void *have
)
172 static inline void netpoll_netdev_init(struct net_device
*dev
)
175 static inline bool netpoll_tx_running(struct net_device
*dev
)
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