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