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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * Common code for low-level network console, dump, and debugger code | |
4 | * | |
5 | * Derived from netconsole, kgdb-over-ethernet, and netdump patches | |
6 | */ | |
7 | ||
8 | #ifndef _LINUX_NETPOLL_H | |
9 | #define _LINUX_NETPOLL_H | |
10 | ||
11 | #include <linux/netdevice.h> | |
12 | #include <linux/interrupt.h> | |
53fb95d3 | 13 | #include <linux/rcupdate.h> |
1da177e4 | 14 | #include <linux/list.h> |
433cea4d | 15 | #include <linux/refcount.h> |
1da177e4 | 16 | |
b7394d24 CW |
17 | union inet_addr { |
18 | __u32 all[4]; | |
19 | __be32 ip; | |
20 | __be32 ip6[4]; | |
21 | struct in_addr in; | |
22 | struct in6_addr in6; | |
23 | }; | |
24 | ||
1da177e4 LT |
25 | struct netpoll { |
26 | struct net_device *dev; | |
bf6bce71 SH |
27 | char dev_name[IFNAMSIZ]; |
28 | const char *name; | |
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 | 34 | |
2cde6acd | 35 | struct work_struct cleanup_work; |
115c1d6e JM |
36 | }; |
37 | ||
38 | struct netpoll_info { | |
433cea4d | 39 | refcount_t refcnt; |
508e14b4 | 40 | |
bd7c4b60 | 41 | struct semaphore dev_lock; |
508e14b4 | 42 | |
b6cd27ed | 43 | struct sk_buff_head txq; |
508e14b4 | 44 | |
6d5aefb8 | 45 | struct delayed_work tx_work; |
0e34e931 WC |
46 | |
47 | struct netpoll *netpoll; | |
38e6bc18 | 48 | struct rcu_head rcu; |
1da177e4 LT |
49 | }; |
50 | ||
ca99ca14 | 51 | #ifdef CONFIG_NETPOLL |
66b5552f EB |
52 | extern void netpoll_poll_disable(struct net_device *dev); |
53 | extern void netpoll_poll_enable(struct net_device *dev); | |
ca99ca14 | 54 | #else |
66b5552f EB |
55 | static inline void netpoll_poll_disable(struct net_device *dev) { return; } |
56 | static inline void netpoll_poll_enable(struct net_device *dev) { return; } | |
ca99ca14 NH |
57 | #endif |
58 | ||
1da177e4 | 59 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); |
0bcc1816 | 60 | void netpoll_print_options(struct netpoll *np); |
1da177e4 | 61 | int netpoll_parse_options(struct netpoll *np, char *opt); |
a8779ec1 | 62 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev); |
1da177e4 | 63 | int netpoll_setup(struct netpoll *np); |
8fdd95ec | 64 | void __netpoll_cleanup(struct netpoll *np); |
2cde6acd | 65 | void __netpoll_free_async(struct netpoll *np); |
1da177e4 | 66 | void netpoll_cleanup(struct netpoll *np); |
c2355e1a NH |
67 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
68 | struct net_device *dev); | |
69 | static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
70 | { | |
2899656b AW |
71 | unsigned long flags; |
72 | local_irq_save(flags); | |
c2355e1a | 73 | netpoll_send_skb_on_dev(np, skb, np->dev); |
2899656b | 74 | local_irq_restore(flags); |
c2355e1a NH |
75 | } |
76 | ||
e1bd4d3d | 77 | #ifdef CONFIG_NETPOLL |
bea3348e SH |
78 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
79 | { | |
80 | struct net_device *dev = napi->dev; | |
81 | ||
bea3348e | 82 | if (dev && dev->npinfo) { |
89c4b442 ED |
83 | int owner = smp_processor_id(); |
84 | ||
85 | while (cmpxchg(&napi->poll_owner, -1, owner) != -1) | |
86 | cpu_relax(); | |
87 | ||
bea3348e | 88 | return napi; |
1da177e4 | 89 | } |
53fb95d3 | 90 | return NULL; |
1da177e4 LT |
91 | } |
92 | ||
53fb95d3 | 93 | static inline void netpoll_poll_unlock(void *have) |
1da177e4 | 94 | { |
bea3348e | 95 | struct napi_struct *napi = have; |
53fb95d3 | 96 | |
89c4b442 ED |
97 | if (napi) |
98 | smp_store_release(&napi->poll_owner, -1); | |
1da177e4 LT |
99 | } |
100 | ||
77ab8a54 | 101 | static inline bool netpoll_tx_running(struct net_device *dev) |
c18370f5 HX |
102 | { |
103 | return irqs_disabled(); | |
104 | } | |
105 | ||
1da177e4 | 106 | #else |
bea3348e SH |
107 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
108 | { | |
109 | return NULL; | |
110 | } | |
111 | static inline void netpoll_poll_unlock(void *have) | |
112 | { | |
113 | } | |
114 | static inline void netpoll_netdev_init(struct net_device *dev) | |
115 | { | |
116 | } | |
77ab8a54 | 117 | static inline bool netpoll_tx_running(struct net_device *dev) |
c18370f5 | 118 | { |
77ab8a54 | 119 | return false; |
c18370f5 | 120 | } |
1da177e4 LT |
121 | #endif |
122 | ||
123 | #endif |