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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/netdevice.h> |
| 13 | #include <linux/etherdevice.h> |
| 14 | #include <linux/string.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 15 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/inetdevice.h> |
| 17 | #include <linux/inet.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/netpoll.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/rcupdate.h> |
| 23 | #include <linux/workqueue.h> |
| 24 | #include <net/tcp.h> |
| 25 | #include <net/udp.h> |
| 26 | #include <asm/unaligned.h> |
| 27 | |
| 28 | /* |
| 29 | * We maintain a small pool of fully-sized skbs, to make sure the |
| 30 | * message gets out even in extreme OOM situations. |
| 31 | */ |
| 32 | |
| 33 | #define MAX_UDP_CHUNK 1460 |
| 34 | #define MAX_SKBS 32 |
| 35 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
| 36 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 37 | static struct sk_buff_head skb_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static atomic_t trapped; |
| 40 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 41 | #define USEC_PER_POLL 50 |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 42 | #define NETPOLL_RX_ENABLED 1 |
| 43 | #define NETPOLL_RX_DROP 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #define MAX_SKB_SIZE \ |
| 46 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
| 47 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
| 48 | |
| 49 | static void zap_completion_queue(void); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 50 | static void arp_reply(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 52 | static void queue_process(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 54 | struct netpoll_info *npinfo = |
| 55 | container_of(work, struct netpoll_info, tx_work.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | struct sk_buff *skb; |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 57 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 59 | while ((skb = skb_dequeue(&npinfo->txq))) { |
| 60 | struct net_device *dev = skb->dev; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 61 | const struct net_device_ops *ops = dev->netdev_ops; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 62 | struct netdev_queue *txq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 64 | if (!netif_device_present(dev) || !netif_running(dev)) { |
| 65 | __kfree_skb(skb); |
| 66 | continue; |
| 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 69 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 70 | |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 71 | local_irq_save(flags); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 72 | __netif_tx_lock(txq, smp_processor_id()); |
| 73 | if (netif_tx_queue_stopped(txq) || |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 74 | netif_tx_queue_frozen(txq) || |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 75 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 76 | skb_queue_head(&npinfo->txq, skb); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 77 | __netif_tx_unlock(txq); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 78 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 80 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 81 | return; |
| 82 | } |
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 | } |
| 86 | } |
| 87 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 88 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
| 89 | unsigned short ulen, __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | { |
Al Viro | d6f5493c | 2006-11-14 21:26:08 -0800 | [diff] [blame] | 91 | __wsum psum; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 92 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 93 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | return 0; |
| 95 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 96 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 98 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 99 | !csum_fold(csum_add(psum, skb->csum))) |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 100 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 102 | skb->csum = psum; |
| 103 | |
| 104 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Check whether delayed processing was scheduled for our NIC. If so, |
| 109 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
| 110 | * If this fails, either we've recursed in ->poll() or it's already |
| 111 | * running on another CPU. |
| 112 | * |
| 113 | * Note: we don't mask interrupts with this lock because we're using |
| 114 | * trylock here and interrupts are already disabled in the softirq |
| 115 | * case. Further, we test the poll_owner to avoid recursion on UP |
| 116 | * systems where the lock doesn't exist. |
| 117 | * |
| 118 | * In cases where there is bi-directional communications, reading only |
| 119 | * one message at a time can lead to packets being dropped by the |
| 120 | * network adapter, forcing superfluous retries and possibly timeouts. |
| 121 | * Thus, we set our budget to greater than 1. |
| 122 | */ |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 123 | static int poll_one_napi(struct netpoll_info *npinfo, |
| 124 | struct napi_struct *napi, int budget) |
| 125 | { |
| 126 | int work; |
| 127 | |
| 128 | /* net_rx_action's ->poll() invocations and our's are |
| 129 | * synchronized by this test which is only made while |
| 130 | * holding the napi->poll_lock. |
| 131 | */ |
| 132 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) |
| 133 | return budget; |
| 134 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 135 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 136 | atomic_inc(&trapped); |
Neil Horman | 7b363e4 | 2008-12-09 23:22:26 -0800 | [diff] [blame] | 137 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 138 | |
| 139 | work = napi->poll(napi, budget); |
| 140 | |
Neil Horman | 7b363e4 | 2008-12-09 23:22:26 -0800 | [diff] [blame] | 141 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 142 | atomic_dec(&trapped); |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 143 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 144 | |
| 145 | return budget - work; |
| 146 | } |
| 147 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 148 | static void poll_napi(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 150 | struct napi_struct *napi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | int budget = 16; |
| 152 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 153 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 154 | if (napi->poll_owner != smp_processor_id() && |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 155 | spin_trylock(&napi->poll_lock)) { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 156 | budget = poll_one_napi(dev->npinfo, napi, budget); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 157 | spin_unlock(&napi->poll_lock); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 158 | |
| 159 | if (!budget) |
| 160 | break; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 161 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | } |
| 164 | |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 165 | static void service_arp_queue(struct netpoll_info *npi) |
| 166 | { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 167 | if (npi) { |
| 168 | struct sk_buff *skb; |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 169 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 170 | while ((skb = skb_dequeue(&npi->arp_tx))) |
| 171 | arp_reply(skb); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 172 | } |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | void netpoll_poll(struct netpoll *np) |
| 176 | { |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 177 | struct net_device *dev = np->dev; |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 178 | const struct net_device_ops *ops = dev->netdev_ops; |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 179 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 180 | if (!dev || !netif_running(dev) || !ops->ndo_poll_controller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | return; |
| 182 | |
| 183 | /* Process pending work on NIC */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 184 | ops->ndo_poll_controller(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 186 | poll_napi(dev); |
| 187 | |
| 188 | service_arp_queue(dev->npinfo); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | zap_completion_queue(); |
| 191 | } |
| 192 | |
| 193 | static void refill_skbs(void) |
| 194 | { |
| 195 | struct sk_buff *skb; |
| 196 | unsigned long flags; |
| 197 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 198 | spin_lock_irqsave(&skb_pool.lock, flags); |
| 199 | while (skb_pool.qlen < MAX_SKBS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
| 201 | if (!skb) |
| 202 | break; |
| 203 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 204 | __skb_queue_tail(&skb_pool, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 206 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void zap_completion_queue(void) |
| 210 | { |
| 211 | unsigned long flags; |
| 212 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
| 213 | |
| 214 | if (sd->completion_queue) { |
| 215 | struct sk_buff *clist; |
| 216 | |
| 217 | local_irq_save(flags); |
| 218 | clist = sd->completion_queue; |
| 219 | sd->completion_queue = NULL; |
| 220 | local_irq_restore(flags); |
| 221 | |
| 222 | while (clist != NULL) { |
| 223 | struct sk_buff *skb = clist; |
| 224 | clist = clist->next; |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 225 | if (skb->destructor) { |
| 226 | atomic_inc(&skb->users); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | dev_kfree_skb_any(skb); /* put this one back */ |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 228 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | __kfree_skb(skb); |
Jarek Poplawski | 8a455b0 | 2008-03-20 16:07:27 -0700 | [diff] [blame] | 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | } |
| 233 | |
| 234 | put_cpu_var(softnet_data); |
| 235 | } |
| 236 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 237 | 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] | 238 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 239 | int count = 0; |
| 240 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | zap_completion_queue(); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 243 | refill_skbs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | repeat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | skb = alloc_skb(len, GFP_ATOMIC); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 247 | if (!skb) |
| 248 | skb = skb_dequeue(&skb_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | if (!skb) { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 251 | if (++count < 10) { |
| 252 | netpoll_poll(np); |
| 253 | goto repeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 255 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | atomic_set(&skb->users, 1); |
| 259 | skb_reserve(skb, reserve); |
| 260 | return skb; |
| 261 | } |
| 262 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 263 | static int netpoll_owner_active(struct net_device *dev) |
| 264 | { |
| 265 | struct napi_struct *napi; |
| 266 | |
| 267 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
| 268 | if (napi->poll_owner == smp_processor_id()) |
| 269 | return 1; |
| 270 | } |
| 271 | return 0; |
| 272 | } |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 275 | { |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 276 | int status = NETDEV_TX_BUSY; |
| 277 | unsigned long tries; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 278 | struct net_device *dev = np->dev; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 279 | const struct net_device_ops *ops = dev->netdev_ops; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 280 | struct netpoll_info *npinfo = np->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 282 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
| 283 | __kfree_skb(skb); |
| 284 | return; |
| 285 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 287 | /* don't get messages out of order, and no recursion */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 288 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 289 | struct netdev_queue *txq; |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 290 | unsigned long flags; |
| 291 | |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 292 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 293 | |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 294 | local_irq_save(flags); |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 295 | /* try until next clock tick */ |
| 296 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
| 297 | tries > 0; --tries) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 298 | if (__netif_tx_trylock(txq)) { |
| 299 | if (!netif_tx_queue_stopped(txq)) |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 300 | status = ops->ndo_start_xmit(skb, dev); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 301 | __netif_tx_unlock(txq); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 302 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 303 | if (status == NETDEV_TX_OK) |
| 304 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 306 | } |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 307 | |
| 308 | /* tickle device maybe there is some cleanup */ |
| 309 | netpoll_poll(np); |
| 310 | |
| 311 | udelay(USEC_PER_POLL); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 312 | } |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 313 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 316 | if (status != NETDEV_TX_OK) { |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 317 | skb_queue_tail(&npinfo->txq, skb); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 318 | schedule_delayed_work(&npinfo->tx_work,0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
| 323 | { |
| 324 | int total_len, eth_len, ip_len, udp_len; |
| 325 | struct sk_buff *skb; |
| 326 | struct udphdr *udph; |
| 327 | struct iphdr *iph; |
| 328 | struct ethhdr *eth; |
| 329 | |
| 330 | udp_len = len + sizeof(*udph); |
| 331 | ip_len = eth_len = udp_len + sizeof(*iph); |
| 332 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
| 333 | |
| 334 | skb = find_skb(np, total_len, total_len - len); |
| 335 | if (!skb) |
| 336 | return; |
| 337 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 338 | skb_copy_to_linear_data(skb, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | skb->len += len; |
| 340 | |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 341 | skb_push(skb, sizeof(*udph)); |
| 342 | skb_reset_transport_header(skb); |
| 343 | udph = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | udph->source = htons(np->local_port); |
| 345 | udph->dest = htons(np->remote_port); |
| 346 | udph->len = htons(udp_len); |
| 347 | udph->check = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 348 | udph->check = csum_tcpudp_magic(np->local_ip, |
| 349 | np->remote_ip, |
Chris Lalancette | 8e365ee | 2006-11-07 14:56:19 -0800 | [diff] [blame] | 350 | udp_len, IPPROTO_UDP, |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 351 | csum_partial(udph, udp_len, 0)); |
Chris Lalancette | 8e365ee | 2006-11-07 14:56:19 -0800 | [diff] [blame] | 352 | if (udph->check == 0) |
Al Viro | 5e57dff | 2006-11-20 18:08:13 -0800 | [diff] [blame] | 353 | udph->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 355 | skb_push(skb, sizeof(*iph)); |
| 356 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 357 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | /* iph->version = 4; iph->ihl = 5; */ |
| 360 | put_unaligned(0x45, (unsigned char *)iph); |
| 361 | iph->tos = 0; |
| 362 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
| 363 | iph->id = 0; |
| 364 | iph->frag_off = 0; |
| 365 | iph->ttl = 64; |
| 366 | iph->protocol = IPPROTO_UDP; |
| 367 | iph->check = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 368 | put_unaligned(np->local_ip, &(iph->saddr)); |
| 369 | put_unaligned(np->remote_ip, &(iph->daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 371 | |
| 372 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 373 | skb_reset_mac_header(skb); |
Stephen Hemminger | 206daaf | 2006-10-19 23:58:23 -0700 | [diff] [blame] | 374 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 375 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
| 376 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | skb->dev = np->dev; |
| 379 | |
| 380 | netpoll_send_skb(np, skb); |
| 381 | } |
| 382 | |
| 383 | static void arp_reply(struct sk_buff *skb) |
| 384 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 385 | struct netpoll_info *npinfo = skb->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | struct arphdr *arp; |
| 387 | unsigned char *arp_ptr; |
| 388 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 389 | __be32 sip, tip; |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 390 | unsigned char *sha; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | struct sk_buff *send_skb; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 392 | struct netpoll *np = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 394 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
| 395 | np = npinfo->rx_np; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 396 | if (!np) |
| 397 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* No arp on this interface */ |
| 400 | if (skb->dev->flags & IFF_NOARP) |
| 401 | return; |
| 402 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 403 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | return; |
| 405 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 406 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 407 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 408 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
| 410 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
| 411 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| 412 | arp->ar_pro != htons(ETH_P_IP) || |
| 413 | arp->ar_op != htons(ARPOP_REQUEST)) |
| 414 | return; |
| 415 | |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 416 | arp_ptr = (unsigned char *)(arp+1); |
| 417 | /* save the location of the src hw addr */ |
| 418 | sha = arp_ptr; |
| 419 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | memcpy(&sip, arp_ptr, 4); |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 421 | arp_ptr += 4; |
| 422 | /* if we actually cared about dst hw addr, it would get copied here */ |
| 423 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | memcpy(&tip, arp_ptr, 4); |
| 425 | |
| 426 | /* Should we ignore arp? */ |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 427 | if (tip != np->local_ip || |
Joe Perches | 21cf225 | 2007-12-16 13:44:00 -0800 | [diff] [blame] | 428 | ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | return; |
| 430 | |
Pavel Emelyanov | 988b705 | 2008-03-03 12:20:57 -0800 | [diff] [blame] | 431 | size = arp_hdr_len(skb->dev); |
Johannes Berg | f5184d2 | 2008-05-12 20:48:31 -0700 | [diff] [blame] | 432 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | LL_RESERVED_SPACE(np->dev)); |
| 434 | |
| 435 | if (!send_skb) |
| 436 | return; |
| 437 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 438 | skb_reset_network_header(send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | arp = (struct arphdr *) skb_put(send_skb, size); |
| 440 | send_skb->dev = skb->dev; |
| 441 | send_skb->protocol = htons(ETH_P_ARP); |
| 442 | |
| 443 | /* Fill the device header for the ARP frame */ |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 444 | if (dev_hard_header(send_skb, skb->dev, ptype, |
Stephen Hemminger | 0953864 | 2007-11-19 19:23:29 -0800 | [diff] [blame] | 445 | sha, np->dev->dev_addr, |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 446 | send_skb->len) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | kfree_skb(send_skb); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Fill out the arp protocol part. |
| 453 | * |
| 454 | * we only support ethernet device type, |
| 455 | * which (according to RFC 1390) should always equal 1 (Ethernet). |
| 456 | */ |
| 457 | |
| 458 | arp->ar_hrd = htons(np->dev->type); |
| 459 | arp->ar_pro = htons(ETH_P_IP); |
| 460 | arp->ar_hln = np->dev->addr_len; |
| 461 | arp->ar_pln = 4; |
| 462 | arp->ar_op = htons(type); |
| 463 | |
| 464 | arp_ptr=(unsigned char *)(arp + 1); |
| 465 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
| 466 | arp_ptr += np->dev->addr_len; |
| 467 | memcpy(arp_ptr, &tip, 4); |
| 468 | arp_ptr += 4; |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 469 | memcpy(arp_ptr, sha, np->dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | arp_ptr += np->dev->addr_len; |
| 471 | memcpy(arp_ptr, &sip, 4); |
| 472 | |
| 473 | netpoll_send_skb(np, send_skb); |
| 474 | } |
| 475 | |
| 476 | int __netpoll_rx(struct sk_buff *skb) |
| 477 | { |
| 478 | int proto, len, ulen; |
| 479 | struct iphdr *iph; |
| 480 | struct udphdr *uh; |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 481 | struct netpoll_info *npi = skb->dev->npinfo; |
| 482 | struct netpoll *np = npi->rx_np; |
| 483 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 484 | if (!np) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | goto out; |
| 486 | if (skb->dev->type != ARPHRD_ETHER) |
| 487 | goto out; |
| 488 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 489 | /* check if netpoll clients need ARP */ |
YOSHIFUJI Hideaki | 724800d | 2007-03-25 20:13:04 -0700 | [diff] [blame] | 490 | if (skb->protocol == htons(ETH_P_ARP) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | atomic_read(&trapped)) { |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 492 | skb_queue_tail(&npi->arp_tx, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | return 1; |
| 494 | } |
| 495 | |
| 496 | proto = ntohs(eth_hdr(skb)->h_proto); |
| 497 | if (proto != ETH_P_IP) |
| 498 | goto out; |
| 499 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 500 | goto out; |
| 501 | if (skb_shared(skb)) |
| 502 | goto out; |
| 503 | |
| 504 | iph = (struct iphdr *)skb->data; |
| 505 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 506 | goto out; |
| 507 | if (iph->ihl < 5 || iph->version != 4) |
| 508 | goto out; |
| 509 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 510 | goto out; |
| 511 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
| 512 | goto out; |
| 513 | |
| 514 | len = ntohs(iph->tot_len); |
| 515 | if (skb->len < len || len < iph->ihl*4) |
| 516 | goto out; |
| 517 | |
Aubrey.Li | 5e7d7fa | 2007-04-17 12:40:20 -0700 | [diff] [blame] | 518 | /* |
| 519 | * Our transport medium may have padded the buffer out. |
| 520 | * Now We trim to the true length of the frame. |
| 521 | */ |
| 522 | if (pskb_trim_rcsum(skb, len)) |
| 523 | goto out; |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | if (iph->protocol != IPPROTO_UDP) |
| 526 | goto out; |
| 527 | |
| 528 | len -= iph->ihl*4; |
| 529 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
| 530 | ulen = ntohs(uh->len); |
| 531 | |
| 532 | if (ulen != len) |
| 533 | goto out; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 534 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | goto out; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 536 | if (np->local_ip && np->local_ip != iph->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | goto out; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 538 | if (np->remote_ip && np->remote_ip != iph->saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | goto out; |
| 540 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
| 541 | goto out; |
| 542 | |
| 543 | np->rx_hook(np, ntohs(uh->source), |
| 544 | (char *)(uh+1), |
| 545 | ulen - sizeof(struct udphdr)); |
| 546 | |
| 547 | kfree_skb(skb); |
| 548 | return 1; |
| 549 | |
| 550 | out: |
| 551 | if (atomic_read(&trapped)) { |
| 552 | kfree_skb(skb); |
| 553 | return 1; |
| 554 | } |
| 555 | |
| 556 | return 0; |
| 557 | } |
| 558 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 559 | void netpoll_print_options(struct netpoll *np) |
| 560 | { |
| 561 | printk(KERN_INFO "%s: local port %d\n", |
| 562 | np->name, np->local_port); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 563 | printk(KERN_INFO "%s: local IP %pI4\n", |
| 564 | np->name, &np->local_ip); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 565 | printk(KERN_INFO "%s: interface %s\n", |
| 566 | np->name, np->dev_name); |
| 567 | printk(KERN_INFO "%s: remote port %d\n", |
| 568 | np->name, np->remote_port); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 569 | printk(KERN_INFO "%s: remote IP %pI4\n", |
| 570 | np->name, &np->remote_ip); |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 571 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
| 572 | np->name, np->remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | int netpoll_parse_options(struct netpoll *np, char *opt) |
| 576 | { |
| 577 | char *cur=opt, *delim; |
| 578 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 579 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if ((delim = strchr(cur, '@')) == NULL) |
| 581 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 582 | *delim = 0; |
| 583 | np->local_port = simple_strtol(cur, NULL, 10); |
| 584 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
| 586 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 588 | if (*cur != '/') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | if ((delim = strchr(cur, '/')) == NULL) |
| 590 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 591 | *delim = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 592 | np->local_ip = in_aton(cur); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 593 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | cur++; |
| 596 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 597 | if (*cur != ',') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | /* parse out dev name */ |
| 599 | if ((delim = strchr(cur, ',')) == NULL) |
| 600 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 601 | *delim = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 603 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | cur++; |
| 606 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 607 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | /* dst port */ |
| 609 | if ((delim = strchr(cur, '@')) == NULL) |
| 610 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 611 | *delim = 0; |
| 612 | np->remote_port = simple_strtol(cur, NULL, 10); |
| 613 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |
| 615 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | /* dst ip */ |
| 618 | if ((delim = strchr(cur, '/')) == NULL) |
| 619 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 620 | *delim = 0; |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 621 | np->remote_ip = in_aton(cur); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 622 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 624 | if (*cur != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | /* MAC address */ |
| 626 | if ((delim = strchr(cur, ':')) == NULL) |
| 627 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 628 | *delim = 0; |
| 629 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); |
| 630 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | if ((delim = strchr(cur, ':')) == NULL) |
| 632 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 633 | *delim = 0; |
| 634 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); |
| 635 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | if ((delim = strchr(cur, ':')) == NULL) |
| 637 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 638 | *delim = 0; |
| 639 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); |
| 640 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | if ((delim = strchr(cur, ':')) == NULL) |
| 642 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 643 | *delim = 0; |
| 644 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); |
| 645 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | if ((delim = strchr(cur, ':')) == NULL) |
| 647 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 648 | *delim = 0; |
| 649 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); |
| 650 | cur = delim + 1; |
| 651 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 654 | netpoll_print_options(np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | return 0; |
| 657 | |
| 658 | parse_failed: |
| 659 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", |
| 660 | np->name, cur); |
| 661 | return -1; |
| 662 | } |
| 663 | |
| 664 | int netpoll_setup(struct netpoll *np) |
| 665 | { |
| 666 | struct net_device *ndev = NULL; |
| 667 | struct in_device *in_dev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 668 | struct netpoll_info *npinfo; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 669 | unsigned long flags; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 670 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
| 672 | if (np->dev_name) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 673 | ndev = dev_get_by_name(&init_net, np->dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | if (!ndev) { |
| 675 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
| 676 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 677 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | np->dev = ndev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 681 | if (!ndev->npinfo) { |
| 682 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 683 | if (!npinfo) { |
| 684 | err = -ENOMEM; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 685 | goto release; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 686 | } |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 687 | |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 688 | npinfo->rx_flags = 0; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 689 | npinfo->rx_np = NULL; |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 690 | |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 691 | spin_lock_init(&npinfo->rx_lock); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 692 | skb_queue_head_init(&npinfo->arp_tx); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 693 | skb_queue_head_init(&npinfo->txq); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 694 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 695 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 696 | atomic_set(&npinfo->refcnt, 1); |
| 697 | } else { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 698 | npinfo = ndev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 699 | atomic_inc(&npinfo->refcnt); |
| 700 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 702 | if (!ndev->netdev_ops->ndo_poll_controller) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
| 704 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 705 | err = -ENOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | goto release; |
| 707 | } |
| 708 | |
| 709 | if (!netif_running(ndev)) { |
| 710 | unsigned long atmost, atleast; |
| 711 | |
| 712 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
| 713 | np->name, np->dev_name); |
| 714 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 715 | rtnl_lock(); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 716 | err = dev_open(ndev); |
| 717 | rtnl_unlock(); |
| 718 | |
| 719 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | printk(KERN_ERR "%s: failed to open %s\n", |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 721 | np->name, ndev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | goto release; |
| 723 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | atleast = jiffies + HZ/10; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 726 | atmost = jiffies + 4*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | while (!netif_carrier_ok(ndev)) { |
| 728 | if (time_after(jiffies, atmost)) { |
| 729 | printk(KERN_NOTICE |
| 730 | "%s: timeout waiting for carrier\n", |
| 731 | np->name); |
| 732 | break; |
| 733 | } |
| 734 | cond_resched(); |
| 735 | } |
| 736 | |
| 737 | /* If carrier appears to come up instantly, we don't |
| 738 | * trust it and pause so that we don't pump all our |
| 739 | * queued console messages into the bitbucket. |
| 740 | */ |
| 741 | |
| 742 | if (time_before(jiffies, atleast)) { |
| 743 | printk(KERN_NOTICE "%s: carrier detect appears" |
| 744 | " untrustworthy, waiting 4 seconds\n", |
| 745 | np->name); |
| 746 | msleep(4000); |
| 747 | } |
| 748 | } |
| 749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | if (!np->local_ip) { |
| 751 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 752 | in_dev = __in_dev_get_rcu(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
| 754 | if (!in_dev || !in_dev->ifa_list) { |
| 755 | rcu_read_unlock(); |
| 756 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
| 757 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 758 | err = -EDESTADDRREQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | goto release; |
| 760 | } |
| 761 | |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 762 | np->local_ip = in_dev->ifa_list->ifa_local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | rcu_read_unlock(); |
Harvey Harrison | e7557af | 2009-03-28 15:38:31 +0000 | [diff] [blame] | 764 | 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] | 765 | } |
| 766 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 767 | if (np->rx_hook) { |
| 768 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 769 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 770 | npinfo->rx_np = np; |
| 771 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 772 | } |
Ingo Molnar | 2652076 | 2005-08-11 19:26:42 -0700 | [diff] [blame] | 773 | |
| 774 | /* fill up the skb queue */ |
| 775 | refill_skbs(); |
| 776 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 777 | /* last thing to do is link it to the net device structure */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 778 | ndev->npinfo = npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 780 | /* avoid racing with NAPI reading npinfo */ |
| 781 | synchronize_rcu(); |
| 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | return 0; |
| 784 | |
| 785 | release: |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 786 | if (!ndev->npinfo) |
| 787 | kfree(npinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | np->dev = NULL; |
| 789 | dev_put(ndev); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 790 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | } |
| 792 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 793 | static int __init netpoll_init(void) |
| 794 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 795 | skb_queue_head_init(&skb_pool); |
| 796 | return 0; |
| 797 | } |
| 798 | core_initcall(netpoll_init); |
| 799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | void netpoll_cleanup(struct netpoll *np) |
| 801 | { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 802 | struct netpoll_info *npinfo; |
| 803 | unsigned long flags; |
| 804 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 805 | if (np->dev) { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 806 | npinfo = np->dev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 807 | if (npinfo) { |
| 808 | if (npinfo->rx_np == np) { |
| 809 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 810 | npinfo->rx_np = NULL; |
David S. Miller | d9452e9 | 2008-03-04 12:28:49 -0800 | [diff] [blame] | 811 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 812 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 813 | } |
| 814 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 815 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
| 816 | skb_queue_purge(&npinfo->arp_tx); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 817 | skb_queue_purge(&npinfo->txq); |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 818 | cancel_rearming_delayed_work(&npinfo->tx_work); |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 819 | |
Jarek Poplawski | 1720081 | 2007-06-28 22:11:47 -0700 | [diff] [blame] | 820 | /* clean after last, unfinished work */ |
Stephen Hemminger | 0adc9ad | 2007-11-19 19:15:03 -0800 | [diff] [blame] | 821 | __skb_queue_purge(&npinfo->txq); |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 822 | kfree(npinfo); |
Satyam Sharma | 1498b3f | 2007-07-09 15:22:23 -0700 | [diff] [blame] | 823 | np->dev->npinfo = NULL; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 824 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 825 | } |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 826 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 827 | dev_put(np->dev); |
| 828 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | np->dev = NULL; |
| 831 | } |
| 832 | |
| 833 | int netpoll_trap(void) |
| 834 | { |
| 835 | return atomic_read(&trapped); |
| 836 | } |
| 837 | |
| 838 | void netpoll_set_trap(int trap) |
| 839 | { |
| 840 | if (trap) |
| 841 | atomic_inc(&trapped); |
| 842 | else |
| 843 | atomic_dec(&trapped); |
| 844 | } |
| 845 | |
| 846 | EXPORT_SYMBOL(netpoll_set_trap); |
| 847 | EXPORT_SYMBOL(netpoll_trap); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 848 | EXPORT_SYMBOL(netpoll_print_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | EXPORT_SYMBOL(netpoll_parse_options); |
| 850 | EXPORT_SYMBOL(netpoll_setup); |
| 851 | EXPORT_SYMBOL(netpoll_cleanup); |
| 852 | EXPORT_SYMBOL(netpoll_send_udp); |
| 853 | EXPORT_SYMBOL(netpoll_poll); |