Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common framework for low-level network console, dump, and debugger code |
| 3 | * |
| 4 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> |
| 5 | * |
| 6 | * based on the netconsole code from: |
| 7 | * |
| 8 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> |
| 9 | * Copyright (C) 2002 Red Hat, Inc. |
| 10 | */ |
| 11 | |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 12 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/netdevice.h> |
| 14 | #include <linux/etherdevice.h> |
| 15 | #include <linux/string.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 16 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/inetdevice.h> |
| 18 | #include <linux/inet.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/netpoll.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/rcupdate.h> |
| 24 | #include <linux/workqueue.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <net/tcp.h> |
| 27 | #include <net/udp.h> |
| 28 | #include <asm/unaligned.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 29 | #include <trace/events/napi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * We maintain a small pool of fully-sized skbs, to make sure the |
| 33 | * message gets out even in extreme OOM situations. |
| 34 | */ |
| 35 | |
| 36 | #define MAX_UDP_CHUNK 1460 |
| 37 | #define MAX_SKBS 32 |
| 38 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
| 39 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 40 | static struct sk_buff_head skb_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | static atomic_t trapped; |
| 43 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 44 | #define USEC_PER_POLL 50 |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 45 | #define NETPOLL_RX_ENABLED 1 |
| 46 | #define NETPOLL_RX_DROP 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define MAX_SKB_SIZE \ |
| 49 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
| 50 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
| 51 | |
| 52 | static void zap_completion_queue(void); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 53 | static void arp_reply(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 55 | static unsigned int carrier_timeout = 4; |
| 56 | module_param(carrier_timeout, uint, 0644); |
| 57 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 58 | static void queue_process(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 60 | struct netpoll_info *npinfo = |
| 61 | container_of(work, struct netpoll_info, tx_work.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | struct sk_buff *skb; |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 63 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 65 | while ((skb = skb_dequeue(&npinfo->txq))) { |
| 66 | struct net_device *dev = skb->dev; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 67 | const struct net_device_ops *ops = dev->netdev_ops; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 68 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 70 | if (!netif_device_present(dev) || !netif_running(dev)) { |
| 71 | __kfree_skb(skb); |
| 72 | continue; |
| 73 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 75 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 76 | |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 77 | local_irq_save(flags); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 78 | __netif_tx_lock(txq, smp_processor_id()); |
| 79 | if (netif_tx_queue_stopped(txq) || |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 80 | netif_tx_queue_frozen(txq) || |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 81 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 82 | skb_queue_head(&npinfo->txq, skb); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 83 | __netif_tx_unlock(txq); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 84 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 86 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 87 | return; |
| 88 | } |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 89 | __netif_tx_unlock(txq); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 90 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | } |
| 93 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 94 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
| 95 | unsigned short ulen, __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Al Viro | d6f5493c | 2006-11-14 21:26:08 -0800 | [diff] [blame] | 97 | __wsum psum; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 98 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 99 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | return 0; |
| 101 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 102 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 104 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 105 | !csum_fold(csum_add(psum, skb->csum))) |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 106 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 108 | skb->csum = psum; |
| 109 | |
| 110 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Check whether delayed processing was scheduled for our NIC. If so, |
| 115 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
| 116 | * If this fails, either we've recursed in ->poll() or it's already |
| 117 | * running on another CPU. |
| 118 | * |
| 119 | * Note: we don't mask interrupts with this lock because we're using |
| 120 | * trylock here and interrupts are already disabled in the softirq |
| 121 | * case. Further, we test the poll_owner to avoid recursion on UP |
| 122 | * systems where the lock doesn't exist. |
| 123 | * |
| 124 | * In cases where there is bi-directional communications, reading only |
| 125 | * one message at a time can lead to packets being dropped by the |
| 126 | * network adapter, forcing superfluous retries and possibly timeouts. |
| 127 | * Thus, we set our budget to greater than 1. |
| 128 | */ |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 129 | static int poll_one_napi(struct netpoll_info *npinfo, |
| 130 | struct napi_struct *napi, int budget) |
| 131 | { |
| 132 | int work; |
| 133 | |
| 134 | /* net_rx_action's ->poll() invocations and our's are |
| 135 | * synchronized by this test which is only made while |
| 136 | * holding the napi->poll_lock. |
| 137 | */ |
| 138 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) |
| 139 | return budget; |
| 140 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 141 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 142 | atomic_inc(&trapped); |
Neil Horman | 7b363e4 | 2008-12-09 23:22:26 -0800 | [diff] [blame] | 143 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 144 | |
| 145 | work = napi->poll(napi, budget); |
David S. Miller | 7d18f11 | 2009-05-21 23:30:09 -0700 | [diff] [blame] | 146 | trace_napi_poll(napi); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 147 | |
Neil Horman | 7b363e4 | 2008-12-09 23:22:26 -0800 | [diff] [blame] | 148 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 149 | atomic_dec(&trapped); |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 150 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 151 | |
| 152 | return budget - work; |
| 153 | } |
| 154 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 155 | static void poll_napi(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 157 | struct napi_struct *napi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | int budget = 16; |
| 159 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 160 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 161 | if (napi->poll_owner != smp_processor_id() && |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 162 | spin_trylock(&napi->poll_lock)) { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 163 | budget = poll_one_napi(dev->npinfo, napi, budget); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 164 | spin_unlock(&napi->poll_lock); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 165 | |
| 166 | if (!budget) |
| 167 | break; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | } |
| 171 | |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 172 | static void service_arp_queue(struct netpoll_info *npi) |
| 173 | { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 174 | if (npi) { |
| 175 | struct sk_buff *skb; |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 176 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 177 | while ((skb = skb_dequeue(&npi->arp_tx))) |
| 178 | arp_reply(skb); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 179 | } |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 180 | } |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | void netpoll_poll(struct netpoll *np) |
| 183 | { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 184 | struct net_device *dev = np->dev; |
Pavel Emelyanov | 5e39273 | 2009-05-11 00:36:35 +0000 | [diff] [blame] | 185 | const struct net_device_ops *ops; |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 186 | |
Pavel Emelyanov | 5e39273 | 2009-05-11 00:36:35 +0000 | [diff] [blame] | 187 | if (!dev || !netif_running(dev)) |
| 188 | return; |
| 189 | |
| 190 | ops = dev->netdev_ops; |
| 191 | if (!ops->ndo_poll_controller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | return; |
| 193 | |
| 194 | /* Process pending work on NIC */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 195 | ops->ndo_poll_controller(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 197 | poll_napi(dev); |
| 198 | |
| 199 | service_arp_queue(dev->npinfo); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | zap_completion_queue(); |
| 202 | } |
| 203 | |
| 204 | static void refill_skbs(void) |
| 205 | { |
| 206 | struct sk_buff *skb; |
| 207 | unsigned long flags; |
| 208 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 209 | spin_lock_irqsave(&skb_pool.lock, flags); |
| 210 | while (skb_pool.qlen < MAX_SKBS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
| 212 | if (!skb) |
| 213 | break; |
| 214 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 215 | __skb_queue_tail(&skb_pool, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 217 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static void zap_completion_queue(void) |
| 221 | { |
| 222 | unsigned long flags; |
| 223 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
| 224 | |
| 225 | if (sd->completion_queue) { |
| 226 | struct sk_buff *clist; |
| 227 | |
| 228 | local_irq_save(flags); |
| 229 | clist = sd->completion_queue; |
| 230 | sd->completion_queue = NULL; |
| 231 | local_irq_restore(flags); |
| 232 | |
| 233 | while (clist != NULL) { |
| 234 | struct sk_buff *skb = clist; |
| 235 | clist = clist->next; |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 236 | if (skb->destructor) { |
| 237 | atomic_inc(&skb->users); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | dev_kfree_skb_any(skb); /* put this one back */ |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 239 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | __kfree_skb(skb); |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 241 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | } |
| 244 | |
| 245 | put_cpu_var(softnet_data); |
| 246 | } |
| 247 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 248 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 250 | int count = 0; |
| 251 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | zap_completion_queue(); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 254 | refill_skbs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | repeat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
| 257 | skb = alloc_skb(len, GFP_ATOMIC); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 258 | if (!skb) |
| 259 | skb = skb_dequeue(&skb_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
| 261 | if (!skb) { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 262 | if (++count < 10) { |
| 263 | netpoll_poll(np); |
| 264 | goto repeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 266 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | atomic_set(&skb->users, 1); |
| 270 | skb_reserve(skb, reserve); |
| 271 | return skb; |
| 272 | } |
| 273 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 274 | static int netpoll_owner_active(struct net_device *dev) |
| 275 | { |
| 276 | struct napi_struct *napi; |
| 277 | |
| 278 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
| 279 | if (napi->poll_owner == smp_processor_id()) |
| 280 | return 1; |
| 281 | } |
| 282 | return 0; |
| 283 | } |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 286 | { |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 287 | int status = NETDEV_TX_BUSY; |
| 288 | unsigned long tries; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 289 | struct net_device *dev = np->dev; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 290 | const struct net_device_ops *ops = dev->netdev_ops; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 291 | struct netpoll_info *npinfo = np->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 293 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
| 294 | __kfree_skb(skb); |
| 295 | return; |
| 296 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 298 | /* don't get messages out of order, and no recursion */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 299 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 300 | struct netdev_queue *txq; |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 301 | unsigned long flags; |
| 302 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 303 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 304 | |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 305 | local_irq_save(flags); |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 306 | /* try until next clock tick */ |
| 307 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
| 308 | tries > 0; --tries) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 309 | if (__netif_tx_trylock(txq)) { |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 310 | if (!netif_tx_queue_stopped(txq)) { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 311 | status = ops->ndo_start_xmit(skb, dev); |
Eric Dumazet | 08baf56 | 2009-05-25 22:58:01 -0700 | [diff] [blame] | 312 | if (status == NETDEV_TX_OK) |
| 313 | txq_trans_update(txq); |
| 314 | } |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 315 | __netif_tx_unlock(txq); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 316 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 317 | if (status == NETDEV_TX_OK) |
| 318 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 320 | } |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 321 | |
| 322 | /* tickle device maybe there is some cleanup */ |
| 323 | netpoll_poll(np); |
| 324 | |
| 325 | udelay(USEC_PER_POLL); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 326 | } |
Dongdong Deng | 79b1bee | 2009-08-21 03:33:36 +0000 | [diff] [blame] | 327 | |
| 328 | WARN_ONCE(!irqs_disabled(), |
| 329 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", |
| 330 | dev->name, ops->ndo_start_xmit); |
| 331 | |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 332 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 335 | if (status != NETDEV_TX_OK) { |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 336 | skb_queue_tail(&npinfo->txq, skb); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 337 | schedule_delayed_work(&npinfo->tx_work,0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
| 342 | { |
| 343 | int total_len, eth_len, ip_len, udp_len; |
| 344 | struct sk_buff *skb; |
| 345 | struct udphdr *udph; |
| 346 | struct iphdr *iph; |
| 347 | struct ethhdr *eth; |
| 348 | |
| 349 | udp_len = len + sizeof(*udph); |
| 350 | ip_len = eth_len = udp_len + sizeof(*iph); |
| 351 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
| 352 | |
| 353 | skb = find_skb(np, total_len, total_len - len); |
| 354 | if (!skb) |
| 355 | return; |
| 356 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 357 | skb_copy_to_linear_data(skb, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | skb->len += len; |
| 359 | |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 360 | skb_push(skb, sizeof(*udph)); |
| 361 | skb_reset_transport_header(skb); |
| 362 | udph = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | udph->source = htons(np->local_port); |
| 364 | udph->dest = htons(np->remote_port); |
| 365 | udph->len = htons(udp_len); |
| 366 | udph->check = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 367 | udph->check = csum_tcpudp_magic(np->local_ip, |
| 368 | np->remote_ip, |
Chris Lalancette | 8e365ee | 2006-11-07 14:56:19 -0800 | [diff] [blame] | 369 | udp_len, IPPROTO_UDP, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 370 | csum_partial(udph, udp_len, 0)); |
Chris Lalancette | 8e365ee | 2006-11-07 14:56:19 -0800 | [diff] [blame] | 371 | if (udph->check == 0) |
Al Viro | 5e57dff | 2006-11-20 18:08:13 -0800 | [diff] [blame] | 372 | udph->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 374 | skb_push(skb, sizeof(*iph)); |
| 375 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 376 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | /* iph->version = 4; iph->ihl = 5; */ |
| 379 | put_unaligned(0x45, (unsigned char *)iph); |
| 380 | iph->tos = 0; |
| 381 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
| 382 | iph->id = 0; |
| 383 | iph->frag_off = 0; |
| 384 | iph->ttl = 64; |
| 385 | iph->protocol = IPPROTO_UDP; |
| 386 | iph->check = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 387 | put_unaligned(np->local_ip, &(iph->saddr)); |
| 388 | put_unaligned(np->remote_ip, &(iph->daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 390 | |
| 391 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 392 | skb_reset_mac_header(skb); |
Stephen Hemminger | 206daaf | 2006-10-19 23:58:23 -0700 | [diff] [blame] | 393 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 394 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
| 395 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | skb->dev = np->dev; |
| 398 | |
| 399 | netpoll_send_skb(np, skb); |
| 400 | } |
| 401 | |
| 402 | static void arp_reply(struct sk_buff *skb) |
| 403 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 404 | struct netpoll_info *npinfo = skb->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | struct arphdr *arp; |
| 406 | unsigned char *arp_ptr; |
| 407 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 408 | __be32 sip, tip; |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 409 | unsigned char *sha; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | struct sk_buff *send_skb; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 411 | struct netpoll *np, *tmp; |
| 412 | unsigned long flags; |
| 413 | int hits = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 415 | if (list_empty(&npinfo->rx_np)) |
| 416 | return; |
| 417 | |
| 418 | /* Before checking the packet, we do some early |
| 419 | inspection whether this is interesting at all */ |
| 420 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 421 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
| 422 | if (np->dev == skb->dev) |
| 423 | hits++; |
| 424 | } |
| 425 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 426 | |
| 427 | /* No netpoll struct is using this dev */ |
| 428 | if (!hits) |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 429 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | /* No arp on this interface */ |
| 432 | if (skb->dev->flags & IFF_NOARP) |
| 433 | return; |
| 434 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 435 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | return; |
| 437 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 438 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 439 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 440 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
| 443 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| 444 | arp->ar_pro != htons(ETH_P_IP) || |
| 445 | arp->ar_op != htons(ARPOP_REQUEST)) |
| 446 | return; |
| 447 | |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 448 | arp_ptr = (unsigned char *)(arp+1); |
| 449 | /* save the location of the src hw addr */ |
| 450 | sha = arp_ptr; |
| 451 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | memcpy(&sip, arp_ptr, 4); |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 453 | arp_ptr += 4; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 454 | /* If we actually cared about dst hw addr, |
| 455 | it would get copied here */ |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 456 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | memcpy(&tip, arp_ptr, 4); |
| 458 | |
| 459 | /* Should we ignore arp? */ |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 460 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | return; |
| 462 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 463 | size = arp_hdr_len(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 465 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 466 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
| 467 | if (tip != np->local_ip) |
| 468 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 470 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
| 471 | LL_RESERVED_SPACE(np->dev)); |
| 472 | if (!send_skb) |
| 473 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 475 | skb_reset_network_header(send_skb); |
| 476 | arp = (struct arphdr *) skb_put(send_skb, size); |
| 477 | send_skb->dev = skb->dev; |
| 478 | send_skb->protocol = htons(ETH_P_ARP); |
| 479 | |
| 480 | /* Fill the device header for the ARP frame */ |
| 481 | if (dev_hard_header(send_skb, skb->dev, ptype, |
| 482 | sha, np->dev->dev_addr, |
| 483 | send_skb->len) < 0) { |
| 484 | kfree_skb(send_skb); |
| 485 | continue; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Fill out the arp protocol part. |
| 490 | * |
| 491 | * we only support ethernet device type, |
| 492 | * which (according to RFC 1390) should |
| 493 | * always equal 1 (Ethernet). |
| 494 | */ |
| 495 | |
| 496 | arp->ar_hrd = htons(np->dev->type); |
| 497 | arp->ar_pro = htons(ETH_P_IP); |
| 498 | arp->ar_hln = np->dev->addr_len; |
| 499 | arp->ar_pln = 4; |
| 500 | arp->ar_op = htons(type); |
| 501 | |
| 502 | arp_ptr = (unsigned char *)(arp + 1); |
| 503 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
| 504 | arp_ptr += np->dev->addr_len; |
| 505 | memcpy(arp_ptr, &tip, 4); |
| 506 | arp_ptr += 4; |
| 507 | memcpy(arp_ptr, sha, np->dev->addr_len); |
| 508 | arp_ptr += np->dev->addr_len; |
| 509 | memcpy(arp_ptr, &sip, 4); |
| 510 | |
| 511 | netpoll_send_skb(np, send_skb); |
| 512 | |
| 513 | /* If there are several rx_hooks for the same address, |
| 514 | we're fine by sending a single reply */ |
| 515 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 517 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | int __netpoll_rx(struct sk_buff *skb) |
| 521 | { |
| 522 | int proto, len, ulen; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 523 | int hits = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | struct iphdr *iph; |
| 525 | struct udphdr *uh; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 526 | struct netpoll_info *npinfo = skb->dev->npinfo; |
| 527 | struct netpoll *np, *tmp; |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 528 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 529 | if (list_empty(&npinfo->rx_np)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | goto out; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | if (skb->dev->type != ARPHRD_ETHER) |
| 533 | goto out; |
| 534 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 535 | /* check if netpoll clients need ARP */ |
YOSHIFUJI Hideaki | 724800d | 2007-03-25 20:13:04 -0700 | [diff] [blame] | 536 | if (skb->protocol == htons(ETH_P_ARP) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | atomic_read(&trapped)) { |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 538 | skb_queue_tail(&npinfo->arp_tx, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | return 1; |
| 540 | } |
| 541 | |
| 542 | proto = ntohs(eth_hdr(skb)->h_proto); |
| 543 | if (proto != ETH_P_IP) |
| 544 | goto out; |
| 545 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 546 | goto out; |
| 547 | if (skb_shared(skb)) |
| 548 | goto out; |
| 549 | |
| 550 | iph = (struct iphdr *)skb->data; |
| 551 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 552 | goto out; |
| 553 | if (iph->ihl < 5 || iph->version != 4) |
| 554 | goto out; |
| 555 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 556 | goto out; |
| 557 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
| 558 | goto out; |
| 559 | |
| 560 | len = ntohs(iph->tot_len); |
| 561 | if (skb->len < len || len < iph->ihl*4) |
| 562 | goto out; |
| 563 | |
Aubrey.Li | 5e7d7fa | 2007-04-17 12:40:20 -0700 | [diff] [blame] | 564 | /* |
| 565 | * Our transport medium may have padded the buffer out. |
| 566 | * Now We trim to the true length of the frame. |
| 567 | */ |
| 568 | if (pskb_trim_rcsum(skb, len)) |
| 569 | goto out; |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | if (iph->protocol != IPPROTO_UDP) |
| 572 | goto out; |
| 573 | |
| 574 | len -= iph->ihl*4; |
| 575 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
| 576 | ulen = ntohs(uh->len); |
| 577 | |
| 578 | if (ulen != len) |
| 579 | goto out; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 580 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 583 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
| 584 | if (np->local_ip && np->local_ip != iph->daddr) |
| 585 | continue; |
| 586 | if (np->remote_ip && np->remote_ip != iph->saddr) |
| 587 | continue; |
| 588 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
| 589 | continue; |
| 590 | |
| 591 | np->rx_hook(np, ntohs(uh->source), |
| 592 | (char *)(uh+1), |
| 593 | ulen - sizeof(struct udphdr)); |
| 594 | hits++; |
| 595 | } |
| 596 | |
| 597 | if (!hits) |
| 598 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | kfree_skb(skb); |
| 601 | return 1; |
| 602 | |
| 603 | out: |
| 604 | if (atomic_read(&trapped)) { |
| 605 | kfree_skb(skb); |
| 606 | return 1; |
| 607 | } |
| 608 | |
| 609 | return 0; |
| 610 | } |
| 611 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 612 | void netpoll_print_options(struct netpoll *np) |
| 613 | { |
| 614 | printk(KERN_INFO "%s: local port %d\n", |
| 615 | np->name, np->local_port); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 616 | printk(KERN_INFO "%s: local IP %pI4\n", |
| 617 | np->name, &np->local_ip); |
Amerigo Wang | 5fc05f8 | 2010-03-21 22:59:58 +0000 | [diff] [blame] | 618 | printk(KERN_INFO "%s: interface '%s'\n", |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 619 | np->name, np->dev_name); |
| 620 | printk(KERN_INFO "%s: remote port %d\n", |
| 621 | np->name, np->remote_port); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 622 | printk(KERN_INFO "%s: remote IP %pI4\n", |
| 623 | np->name, &np->remote_ip); |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 624 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
| 625 | np->name, np->remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 626 | } |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | int netpoll_parse_options(struct netpoll *np, char *opt) |
| 629 | { |
| 630 | char *cur=opt, *delim; |
| 631 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 632 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | if ((delim = strchr(cur, '@')) == NULL) |
| 634 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 635 | *delim = 0; |
| 636 | np->local_port = simple_strtol(cur, NULL, 10); |
| 637 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 641 | if (*cur != '/') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | if ((delim = strchr(cur, '/')) == NULL) |
| 643 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 644 | *delim = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 645 | np->local_ip = in_aton(cur); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 646 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | cur++; |
| 649 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 650 | if (*cur != ',') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | /* parse out dev name */ |
| 652 | if ((delim = strchr(cur, ',')) == NULL) |
| 653 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 654 | *delim = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 656 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
| 658 | cur++; |
| 659 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 660 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | /* dst port */ |
| 662 | if ((delim = strchr(cur, '@')) == NULL) |
| 663 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 664 | *delim = 0; |
Amerigo Wang | 5fc05f8 | 2010-03-21 22:59:58 +0000 | [diff] [blame] | 665 | if (*cur == ' ' || *cur == '\t') |
| 666 | printk(KERN_INFO "%s: warning: whitespace" |
| 667 | "is not allowed\n", np->name); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 668 | np->remote_port = simple_strtol(cur, NULL, 10); |
| 669 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
| 671 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | /* dst ip */ |
| 674 | if ((delim = strchr(cur, '/')) == NULL) |
| 675 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 676 | *delim = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 677 | np->remote_ip = in_aton(cur); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 678 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 680 | if (*cur != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | /* MAC address */ |
| 682 | if ((delim = strchr(cur, ':')) == NULL) |
| 683 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 684 | *delim = 0; |
| 685 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); |
| 686 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | if ((delim = strchr(cur, ':')) == NULL) |
| 688 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 689 | *delim = 0; |
| 690 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); |
| 691 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | if ((delim = strchr(cur, ':')) == NULL) |
| 693 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 694 | *delim = 0; |
| 695 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); |
| 696 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | if ((delim = strchr(cur, ':')) == NULL) |
| 698 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 699 | *delim = 0; |
| 700 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); |
| 701 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if ((delim = strchr(cur, ':')) == NULL) |
| 703 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 704 | *delim = 0; |
| 705 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); |
| 706 | cur = delim + 1; |
| 707 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
| 709 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 710 | netpoll_print_options(np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | return 0; |
| 713 | |
| 714 | parse_failed: |
Amerigo Wang | 5fc05f8 | 2010-03-21 22:59:58 +0000 | [diff] [blame] | 715 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | np->name, cur); |
| 717 | return -1; |
| 718 | } |
| 719 | |
| 720 | int netpoll_setup(struct netpoll *np) |
| 721 | { |
| 722 | struct net_device *ndev = NULL; |
| 723 | struct in_device *in_dev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 724 | struct netpoll_info *npinfo; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 725 | struct netpoll *npe, *tmp; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 726 | unsigned long flags; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 727 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | if (np->dev_name) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 730 | ndev = dev_get_by_name(&init_net, np->dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | if (!ndev) { |
| 732 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
| 733 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 734 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | np->dev = ndev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 738 | if (!ndev->npinfo) { |
| 739 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 740 | if (!npinfo) { |
| 741 | err = -ENOMEM; |
Jiri Slaby | 21edbb2 | 2010-03-16 05:29:54 +0000 | [diff] [blame] | 742 | goto put; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 743 | } |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 744 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 745 | npinfo->rx_flags = 0; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 746 | INIT_LIST_HEAD(&npinfo->rx_np); |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 747 | |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 748 | spin_lock_init(&npinfo->rx_lock); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 749 | skb_queue_head_init(&npinfo->arp_tx); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 750 | skb_queue_head_init(&npinfo->txq); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 751 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 752 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 753 | atomic_set(&npinfo->refcnt, 1); |
| 754 | } else { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 755 | npinfo = ndev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 756 | atomic_inc(&npinfo->refcnt); |
| 757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 759 | if (!ndev->netdev_ops->ndo_poll_controller) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
| 761 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 762 | err = -ENOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | goto release; |
| 764 | } |
| 765 | |
| 766 | if (!netif_running(ndev)) { |
| 767 | unsigned long atmost, atleast; |
| 768 | |
| 769 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
| 770 | np->name, np->dev_name); |
| 771 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 772 | rtnl_lock(); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 773 | err = dev_open(ndev); |
| 774 | rtnl_unlock(); |
| 775 | |
| 776 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | printk(KERN_ERR "%s: failed to open %s\n", |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 778 | np->name, ndev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | goto release; |
| 780 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | atleast = jiffies + HZ/10; |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 783 | atmost = jiffies + carrier_timeout * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | while (!netif_carrier_ok(ndev)) { |
| 785 | if (time_after(jiffies, atmost)) { |
| 786 | printk(KERN_NOTICE |
| 787 | "%s: timeout waiting for carrier\n", |
| 788 | np->name); |
| 789 | break; |
| 790 | } |
Anton Vorontsov | 1b614fb | 2009-07-08 20:09:44 -0700 | [diff] [blame] | 791 | msleep(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | /* If carrier appears to come up instantly, we don't |
| 795 | * trust it and pause so that we don't pump all our |
| 796 | * queued console messages into the bitbucket. |
| 797 | */ |
| 798 | |
| 799 | if (time_before(jiffies, atleast)) { |
| 800 | printk(KERN_NOTICE "%s: carrier detect appears" |
| 801 | " untrustworthy, waiting 4 seconds\n", |
| 802 | np->name); |
| 803 | msleep(4000); |
| 804 | } |
| 805 | } |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | if (!np->local_ip) { |
| 808 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 809 | in_dev = __in_dev_get_rcu(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | if (!in_dev || !in_dev->ifa_list) { |
| 812 | rcu_read_unlock(); |
| 813 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
| 814 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 815 | err = -EDESTADDRREQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | goto release; |
| 817 | } |
| 818 | |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 819 | np->local_ip = in_dev->ifa_list->ifa_local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | rcu_read_unlock(); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 821 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 824 | if (np->rx_hook) { |
| 825 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 826 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 827 | list_add_tail(&np->rx, &npinfo->rx_np); |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 828 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 829 | } |
Ingo Molnar | 2652076 | 2005-08-11 19:26:42 -0700 | [diff] [blame] | 830 | |
| 831 | /* fill up the skb queue */ |
| 832 | refill_skbs(); |
| 833 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 834 | /* last thing to do is link it to the net device structure */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 835 | ndev->npinfo = npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 837 | /* avoid racing with NAPI reading npinfo */ |
| 838 | synchronize_rcu(); |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | return 0; |
| 841 | |
| 842 | release: |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 843 | if (!ndev->npinfo) { |
| 844 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 845 | list_for_each_entry_safe(npe, tmp, &npinfo->rx_np, rx) { |
| 846 | npe->dev = NULL; |
| 847 | } |
| 848 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 849 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 850 | kfree(npinfo); |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 851 | } |
Jiri Slaby | 21edbb2 | 2010-03-16 05:29:54 +0000 | [diff] [blame] | 852 | put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | dev_put(ndev); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 854 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 857 | static int __init netpoll_init(void) |
| 858 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 859 | skb_queue_head_init(&skb_pool); |
| 860 | return 0; |
| 861 | } |
| 862 | core_initcall(netpoll_init); |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | void netpoll_cleanup(struct netpoll *np) |
| 865 | { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 866 | struct netpoll_info *npinfo; |
| 867 | unsigned long flags; |
| 868 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 869 | if (np->dev) { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 870 | npinfo = np->dev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 871 | if (npinfo) { |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 872 | if (!list_empty(&npinfo->rx_np)) { |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 873 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
Daniel Borkmann | 508e14b | 2010-01-12 14:27:30 +0000 | [diff] [blame] | 874 | list_del(&np->rx); |
| 875 | if (list_empty(&npinfo->rx_np)) |
| 876 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 877 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 878 | } |
| 879 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 880 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
| 881 | skb_queue_purge(&npinfo->arp_tx); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 882 | skb_queue_purge(&npinfo->txq); |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 883 | cancel_rearming_delayed_work(&npinfo->tx_work); |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 884 | |
Jarek Poplawski | 1720081 | 2007-06-28 22:11:47 -0700 | [diff] [blame] | 885 | /* clean after last, unfinished work */ |
Stephen Hemminger | 0adc9ad | 2007-11-19 19:15:03 -0800 | [diff] [blame] | 886 | __skb_queue_purge(&npinfo->txq); |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 887 | kfree(npinfo); |
Satyam Sharma | 1498b3f | 2007-07-09 15:22:23 -0700 | [diff] [blame] | 888 | np->dev->npinfo = NULL; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 889 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 890 | } |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 891 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 892 | dev_put(np->dev); |
| 893 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | np->dev = NULL; |
| 896 | } |
| 897 | |
| 898 | int netpoll_trap(void) |
| 899 | { |
| 900 | return atomic_read(&trapped); |
| 901 | } |
| 902 | |
| 903 | void netpoll_set_trap(int trap) |
| 904 | { |
| 905 | if (trap) |
| 906 | atomic_inc(&trapped); |
| 907 | else |
| 908 | atomic_dec(&trapped); |
| 909 | } |
| 910 | |
| 911 | EXPORT_SYMBOL(netpoll_set_trap); |
| 912 | EXPORT_SYMBOL(netpoll_trap); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 913 | EXPORT_SYMBOL(netpoll_print_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | EXPORT_SYMBOL(netpoll_parse_options); |
| 915 | EXPORT_SYMBOL(netpoll_setup); |
| 916 | EXPORT_SYMBOL(netpoll_cleanup); |
| 917 | EXPORT_SYMBOL(netpoll_send_udp); |
| 918 | EXPORT_SYMBOL(netpoll_poll); |