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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Common code for low-level network console, dump, and debugger code | |
3 | * | |
4 | * Derived from netconsole, kgdb-over-ethernet, and netdump patches | |
5 | */ | |
6 | ||
7 | #ifndef _LINUX_NETPOLL_H | |
8 | #define _LINUX_NETPOLL_H | |
9 | ||
10 | #include <linux/netdevice.h> | |
11 | #include <linux/interrupt.h> | |
53fb95d3 | 12 | #include <linux/rcupdate.h> |
1da177e4 LT |
13 | #include <linux/list.h> |
14 | ||
b7394d24 CW |
15 | union inet_addr { |
16 | __u32 all[4]; | |
17 | __be32 ip; | |
18 | __be32 ip6[4]; | |
19 | struct in_addr in; | |
20 | struct in6_addr in6; | |
21 | }; | |
22 | ||
1da177e4 LT |
23 | struct netpoll { |
24 | struct net_device *dev; | |
bf6bce71 SH |
25 | char dev_name[IFNAMSIZ]; |
26 | const char *name; | |
8fb479a4 AQ |
27 | void (*rx_skb_hook)(struct netpoll *np, int source, struct sk_buff *skb, |
28 | int offset, int len); | |
5de4a473 | 29 | |
b7394d24 CW |
30 | union inet_addr local_ip, remote_ip; |
31 | bool ipv6; | |
1da177e4 | 32 | u16 local_port, remote_port; |
09538641 | 33 | u8 remote_mac[ETH_ALEN]; |
508e14b4 DB |
34 | |
35 | struct list_head rx; /* rx_np list element */ | |
2cde6acd | 36 | struct work_struct cleanup_work; |
115c1d6e JM |
37 | }; |
38 | ||
39 | struct netpoll_info { | |
93ec2c72 | 40 | atomic_t refcnt; |
508e14b4 | 41 | |
ca99ca14 | 42 | unsigned long rx_flags; |
fbeec2e1 | 43 | spinlock_t rx_lock; |
bd7c4b60 | 44 | struct semaphore dev_lock; |
8fb479a4 | 45 | struct list_head rx_np; /* netpolls that registered an rx_skb_hook */ |
508e14b4 | 46 | |
b7394d24 | 47 | struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */ |
b6cd27ed | 48 | struct sk_buff_head txq; |
508e14b4 | 49 | |
6d5aefb8 | 50 | struct delayed_work tx_work; |
0e34e931 WC |
51 | |
52 | struct netpoll *netpoll; | |
38e6bc18 | 53 | struct rcu_head rcu; |
1da177e4 LT |
54 | }; |
55 | ||
ca99ca14 | 56 | #ifdef CONFIG_NETPOLL |
da6e378b | 57 | extern void netpoll_rx_disable(struct net_device *dev); |
ca99ca14 NH |
58 | extern void netpoll_rx_enable(struct net_device *dev); |
59 | #else | |
da6e378b | 60 | static inline void netpoll_rx_disable(struct net_device *dev) { return; } |
ca99ca14 NH |
61 | static inline void netpoll_rx_enable(struct net_device *dev) { return; } |
62 | #endif | |
63 | ||
1da177e4 | 64 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); |
0bcc1816 | 65 | void netpoll_print_options(struct netpoll *np); |
1da177e4 | 66 | int netpoll_parse_options(struct netpoll *np, char *opt); |
47be03a2 | 67 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp); |
1da177e4 LT |
68 | int netpoll_setup(struct netpoll *np); |
69 | int netpoll_trap(void); | |
70 | void netpoll_set_trap(int trap); | |
8fdd95ec | 71 | void __netpoll_cleanup(struct netpoll *np); |
2cde6acd | 72 | void __netpoll_free_async(struct netpoll *np); |
1da177e4 | 73 | void netpoll_cleanup(struct netpoll *np); |
57c5d461 | 74 | int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo); |
c2355e1a NH |
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) | |
78 | { | |
2899656b AW |
79 | unsigned long flags; |
80 | local_irq_save(flags); | |
c2355e1a | 81 | netpoll_send_skb_on_dev(np, skb, np->dev); |
2899656b | 82 | local_irq_restore(flags); |
c2355e1a NH |
83 | } |
84 | ||
5de4a473 | 85 | |
1da177e4 LT |
86 | |
87 | #ifdef CONFIG_NETPOLL | |
77ab8a54 | 88 | static inline bool netpoll_rx_on(struct sk_buff *skb) |
91fe4a4b AW |
89 | { |
90 | struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo); | |
91 | ||
92 | return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags); | |
93 | } | |
94 | ||
ffb27362 | 95 | static inline bool netpoll_rx(struct sk_buff *skb) |
1da177e4 | 96 | { |
de85d99e | 97 | struct netpoll_info *npinfo; |
fbeec2e1 | 98 | unsigned long flags; |
ffb27362 | 99 | bool ret = false; |
115c1d6e | 100 | |
f0f9deae | 101 | local_irq_save(flags); |
de85d99e | 102 | |
91fe4a4b | 103 | if (!netpoll_rx_on(skb)) |
de85d99e | 104 | goto out; |
115c1d6e | 105 | |
91fe4a4b | 106 | npinfo = rcu_dereference_bh(skb->dev->npinfo); |
f0f9deae | 107 | spin_lock(&npinfo->rx_lock); |
d9452e9f | 108 | /* check rx_flags again with the lock held */ |
57c5d461 | 109 | if (npinfo->rx_flags && __netpoll_rx(skb, npinfo)) |
ffb27362 | 110 | ret = true; |
f0f9deae | 111 | spin_unlock(&npinfo->rx_lock); |
fbeec2e1 | 112 | |
de85d99e | 113 | out: |
f0f9deae | 114 | local_irq_restore(flags); |
fbeec2e1 | 115 | return ret; |
1da177e4 LT |
116 | } |
117 | ||
bea3348e | 118 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
1da177e4 | 119 | { |
bea3348e SH |
120 | if (!list_empty(&skb->dev->napi_list)) |
121 | return netpoll_rx(skb); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
126 | { | |
127 | struct net_device *dev = napi->dev; | |
128 | ||
bea3348e SH |
129 | if (dev && dev->npinfo) { |
130 | spin_lock(&napi->poll_lock); | |
131 | napi->poll_owner = smp_processor_id(); | |
132 | return napi; | |
1da177e4 | 133 | } |
53fb95d3 | 134 | return NULL; |
1da177e4 LT |
135 | } |
136 | ||
53fb95d3 | 137 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 138 | { |
bea3348e | 139 | struct napi_struct *napi = have; |
53fb95d3 | 140 | |
bea3348e SH |
141 | if (napi) { |
142 | napi->poll_owner = -1; | |
143 | spin_unlock(&napi->poll_lock); | |
1da177e4 LT |
144 | } |
145 | } | |
146 | ||
77ab8a54 | 147 | static inline bool netpoll_tx_running(struct net_device *dev) |
c18370f5 HX |
148 | { |
149 | return irqs_disabled(); | |
150 | } | |
151 | ||
1da177e4 | 152 | #else |
969a6e52 | 153 | static inline bool netpoll_rx(struct sk_buff *skb) |
bea3348e | 154 | { |
77ab8a54 | 155 | return false; |
bea3348e | 156 | } |
77ab8a54 | 157 | static inline bool netpoll_rx_on(struct sk_buff *skb) |
d1c76af9 | 158 | { |
77ab8a54 | 159 | return false; |
d1c76af9 | 160 | } |
bea3348e SH |
161 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
162 | { | |
163 | return 0; | |
164 | } | |
165 | static inline void *netpoll_poll_lock(struct napi_struct *napi) | |
166 | { | |
167 | return NULL; | |
168 | } | |
169 | static inline void netpoll_poll_unlock(void *have) | |
170 | { | |
171 | } | |
172 | static inline void netpoll_netdev_init(struct net_device *dev) | |
173 | { | |
174 | } | |
77ab8a54 | 175 | static inline bool netpoll_tx_running(struct net_device *dev) |
c18370f5 | 176 | { |
77ab8a54 | 177 | return false; |
c18370f5 | 178 | } |
1da177e4 LT |
179 | #endif |
180 | ||
181 | #endif |