Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 12 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/list.h> |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | struct netpoll { |
| 16 | struct net_device *dev; |
Stephen Hemminger | bf6bce7 | 2006-10-26 15:46:56 -0700 | [diff] [blame] | 17 | char dev_name[IFNAMSIZ]; |
| 18 | const char *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | void (*rx_hook)(struct netpoll *, int, char *, int); |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 20 | |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 21 | __be32 local_ip, remote_ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | u16 local_port, remote_port; |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 23 | u8 remote_mac[ETH_ALEN]; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 24 | |
| 25 | struct list_head rx; /* rx_np list element */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | struct netpoll_info { |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 29 | atomic_t refcnt; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 30 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 31 | int rx_flags; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 32 | spinlock_t rx_lock; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 33 | struct list_head rx_np; /* netpolls that registered an rx_hook */ |
| 34 | |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 35 | struct sk_buff_head arp_tx; /* list of arp requests to reply to */ |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 36 | struct sk_buff_head txq; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 37 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 38 | struct delayed_work tx_work; |
WANG Cong | 0e34e93 | 2010-05-06 00:47:21 -0700 | [diff] [blame] | 39 | |
| 40 | struct netpoll *netpoll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 44 | void netpoll_print_options(struct netpoll *np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | int netpoll_parse_options(struct netpoll *np, char *opt); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 46 | int __netpoll_setup(struct netpoll *np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | int netpoll_setup(struct netpoll *np); |
| 48 | int netpoll_trap(void); |
| 49 | void netpoll_set_trap(int trap); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 50 | void __netpoll_cleanup(struct netpoll *np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | void netpoll_cleanup(struct netpoll *np); |
| 52 | int __netpoll_rx(struct sk_buff *skb); |
Neil Horman | c2355e1 | 2010-10-13 16:01:49 +0000 | [diff] [blame] | 53 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
| 54 | struct net_device *dev); |
| 55 | static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 56 | { |
| 57 | netpoll_send_skb_on_dev(np, skb, np->dev); |
| 58 | } |
| 59 | |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | #ifdef CONFIG_NETPOLL |
David S. Miller | ffb2736 | 2010-05-06 01:20:10 -0700 | [diff] [blame] | 63 | static inline bool netpoll_rx(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Herbert Xu | de85d99 | 2010-06-10 16:12:44 +0000 | [diff] [blame] | 65 | struct netpoll_info *npinfo; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 66 | unsigned long flags; |
David S. Miller | ffb2736 | 2010-05-06 01:20:10 -0700 | [diff] [blame] | 67 | bool ret = false; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 68 | |
Herbert Xu | f0f9dea | 2010-09-17 16:55:03 -0700 | [diff] [blame] | 69 | local_irq_save(flags); |
Herbert Xu | d5f31fb | 2010-06-15 21:44:29 -0700 | [diff] [blame] | 70 | npinfo = rcu_dereference_bh(skb->dev->npinfo); |
Herbert Xu | de85d99 | 2010-06-10 16:12:44 +0000 | [diff] [blame] | 71 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 72 | if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags)) |
Herbert Xu | de85d99 | 2010-06-10 16:12:44 +0000 | [diff] [blame] | 73 | goto out; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 74 | |
Herbert Xu | f0f9dea | 2010-09-17 16:55:03 -0700 | [diff] [blame] | 75 | spin_lock(&npinfo->rx_lock); |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 76 | /* check rx_flags again with the lock held */ |
| 77 | if (npinfo->rx_flags && __netpoll_rx(skb)) |
David S. Miller | ffb2736 | 2010-05-06 01:20:10 -0700 | [diff] [blame] | 78 | ret = true; |
Herbert Xu | f0f9dea | 2010-09-17 16:55:03 -0700 | [diff] [blame] | 79 | spin_unlock(&npinfo->rx_lock); |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 80 | |
Herbert Xu | de85d99 | 2010-06-10 16:12:44 +0000 | [diff] [blame] | 81 | out: |
Herbert Xu | f0f9dea | 2010-09-17 16:55:03 -0700 | [diff] [blame] | 82 | local_irq_restore(flags); |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 83 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 86 | static inline int netpoll_rx_on(struct sk_buff *skb) |
| 87 | { |
Herbert Xu | d5f31fb | 2010-06-15 21:44:29 -0700 | [diff] [blame] | 88 | struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo); |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 89 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 90 | return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags); |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 91 | } |
| 92 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 93 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 95 | if (!list_empty(&skb->dev->napi_list)) |
| 96 | return netpoll_rx(skb); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
| 101 | { |
| 102 | struct net_device *dev = napi->dev; |
| 103 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 104 | if (dev && dev->npinfo) { |
| 105 | spin_lock(&napi->poll_lock); |
| 106 | napi->poll_owner = smp_processor_id(); |
| 107 | return napi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 109 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 112 | static inline void netpoll_poll_unlock(void *have) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 114 | struct napi_struct *napi = have; |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 115 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 116 | if (napi) { |
| 117 | napi->poll_owner = -1; |
| 118 | spin_unlock(&napi->poll_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | } |
| 121 | |
Herbert Xu | c18370f | 2010-06-10 16:12:49 +0000 | [diff] [blame] | 122 | static inline int netpoll_tx_running(struct net_device *dev) |
| 123 | { |
| 124 | return irqs_disabled(); |
| 125 | } |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | #else |
John W. Linville | 969a6e5 | 2010-08-10 16:24:41 -0700 | [diff] [blame] | 128 | static inline bool netpoll_rx(struct sk_buff *skb) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 129 | { |
| 130 | return 0; |
| 131 | } |
Herbert Xu | d1c76af | 2009-03-16 10:50:02 -0700 | [diff] [blame] | 132 | static inline int netpoll_rx_on(struct sk_buff *skb) |
| 133 | { |
| 134 | return 0; |
| 135 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 136 | static inline int netpoll_receive_skb(struct sk_buff *skb) |
| 137 | { |
| 138 | return 0; |
| 139 | } |
| 140 | static inline void *netpoll_poll_lock(struct napi_struct *napi) |
| 141 | { |
| 142 | return NULL; |
| 143 | } |
| 144 | static inline void netpoll_poll_unlock(void *have) |
| 145 | { |
| 146 | } |
| 147 | static inline void netpoll_netdev_init(struct net_device *dev) |
| 148 | { |
| 149 | } |
Herbert Xu | c18370f | 2010-06-10 16:12:49 +0000 | [diff] [blame] | 150 | static inline int netpoll_tx_running(struct net_device *dev) |
| 151 | { |
| 152 | return 0; |
| 153 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | #endif |
| 155 | |
| 156 | #endif |