blob: 4e98ffac3af0259bda8cbadfb9609fa6b57405a8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Vorontsovbff38772009-07-08 11:10:56 -070012#include <linux/moduleparam.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/netdevice.h>
14#include <linux/etherdevice.h>
15#include <linux/string.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020016#include <linux/if_arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#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 Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/tcp.h>
27#include <net/udp.h>
28#include <asm/unaligned.h>
David S. Miller9cbc1cb2009-06-15 03:02:23 -070029#include <trace/events/napi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
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 Hemmingera1bcfac2006-11-14 10:43:58 -080040static struct sk_buff_head skb_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42static atomic_t trapped;
43
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -070044#define USEC_PER_POLL 50
David S. Millerd9452e92008-03-04 12:28:49 -080045#define NETPOLL_RX_ENABLED 1
46#define NETPOLL_RX_DROP 2
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define MAX_SKB_SIZE \
49 (MAX_UDP_CHUNK + sizeof(struct udphdr) + \
50 sizeof(struct iphdr) + sizeof(struct ethhdr))
51
David S. Miller3578b0c2010-08-03 00:24:04 -070052static void zap_completion_queue(void);
Neil Horman068c6e92006-06-26 00:04:27 -070053static void arp_reply(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Anton Vorontsovbff38772009-07-08 11:10:56 -070055static unsigned int carrier_timeout = 4;
56module_param(carrier_timeout, uint, 0644);
57
David Howellsc4028952006-11-22 14:57:56 +000058static void queue_process(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
David Howells4c1ac1b2006-12-05 14:37:56 +000060 struct netpoll_info *npinfo =
61 container_of(work, struct netpoll_info, tx_work.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 struct sk_buff *skb;
Ingo Molnar36405432006-12-12 17:20:42 +010063 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070065 while ((skb = skb_dequeue(&npinfo->txq))) {
66 struct net_device *dev = skb->dev;
Stephen Hemminger00829822008-11-20 20:14:53 -080067 const struct net_device_ops *ops = dev->netdev_ops;
David S. Millerfd2ea0a2008-07-17 01:56:23 -070068 struct netdev_queue *txq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070070 if (!netif_device_present(dev) || !netif_running(dev)) {
71 __kfree_skb(skb);
72 continue;
73 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
David S. Millerfd2ea0a2008-07-17 01:56:23 -070075 txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
76
Ingo Molnar36405432006-12-12 17:20:42 +010077 local_irq_save(flags);
David S. Millerfd2ea0a2008-07-17 01:56:23 -070078 __netif_tx_lock(txq, smp_processor_id());
79 if (netif_tx_queue_stopped(txq) ||
David S. Millerc3f26a22008-07-31 16:58:50 -070080 netif_tx_queue_frozen(txq) ||
Stephen Hemminger00829822008-11-20 20:14:53 -080081 ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) {
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070082 skb_queue_head(&npinfo->txq, skb);
David S. Millerfd2ea0a2008-07-17 01:56:23 -070083 __netif_tx_unlock(txq);
Ingo Molnar36405432006-12-12 17:20:42 +010084 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Jarek Poplawski25442ca2007-07-05 17:42:44 -070086 schedule_delayed_work(&npinfo->tx_work, HZ/10);
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070087 return;
88 }
David S. Millerfd2ea0a2008-07-17 01:56:23 -070089 __netif_tx_unlock(txq);
Ingo Molnar36405432006-12-12 17:20:42 +010090 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
92}
93
Al Virob51655b2006-11-14 21:40:42 -080094static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
95 unsigned short ulen, __be32 saddr, __be32 daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Al Virod6f5493c2006-11-14 21:26:08 -080097 __wsum psum;
Herbert Xufb286bb2005-11-10 13:01:24 -080098
Herbert Xu60476372007-04-09 11:59:39 -070099 if (uh->check == 0 || skb_csum_unnecessary(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return 0;
101
Herbert Xufb286bb2005-11-10 13:01:24 -0800102 psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Patrick McHardy84fa7932006-08-29 16:44:56 -0700104 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Al Virod3bc23e2006-11-14 21:24:49 -0800105 !csum_fold(csum_add(psum, skb->csum)))
Herbert Xufb286bb2005-11-10 13:01:24 -0800106 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Herbert Xufb286bb2005-11-10 13:01:24 -0800108 skb->csum = psum;
109
110 return __skb_checksum_complete(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111}
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. Miller0a7606c2007-10-29 21:28:47 -0700129static 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. Millerd9452e92008-03-04 12:28:49 -0800141 npinfo->rx_flags |= NETPOLL_RX_DROP;
David S. Miller0a7606c2007-10-29 21:28:47 -0700142 atomic_inc(&trapped);
Neil Horman7b363e42008-12-09 23:22:26 -0800143 set_bit(NAPI_STATE_NPSVC, &napi->state);
David S. Miller0a7606c2007-10-29 21:28:47 -0700144
145 work = napi->poll(napi, budget);
David S. Miller7d18f112009-05-21 23:30:09 -0700146 trace_napi_poll(napi);
David S. Miller0a7606c2007-10-29 21:28:47 -0700147
Neil Horman7b363e42008-12-09 23:22:26 -0800148 clear_bit(NAPI_STATE_NPSVC, &napi->state);
David S. Miller0a7606c2007-10-29 21:28:47 -0700149 atomic_dec(&trapped);
David S. Millerd9452e92008-03-04 12:28:49 -0800150 npinfo->rx_flags &= ~NETPOLL_RX_DROP;
David S. Miller0a7606c2007-10-29 21:28:47 -0700151
152 return budget - work;
153}
154
Stephen Hemminger51069302007-11-19 19:18:11 -0800155static void poll_napi(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700157 struct napi_struct *napi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int budget = 16;
159
Neil Hormanf13d4932010-10-19 07:04:26 +0000160 list_for_each_entry(napi, &dev->napi_list, dev_list) {
David S. Miller0a7606c2007-10-29 21:28:47 -0700161 if (napi->poll_owner != smp_processor_id() &&
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700162 spin_trylock(&napi->poll_lock)) {
Stephen Hemminger51069302007-11-19 19:18:11 -0800163 budget = poll_one_napi(dev->npinfo, napi, budget);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700164 spin_unlock(&napi->poll_lock);
David S. Miller0a7606c2007-10-29 21:28:47 -0700165
166 if (!budget)
167 break;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
170}
171
Neil Horman068c6e92006-06-26 00:04:27 -0700172static void service_arp_queue(struct netpoll_info *npi)
173{
Stephen Hemminger51069302007-11-19 19:18:11 -0800174 if (npi) {
175 struct sk_buff *skb;
Neil Horman068c6e92006-06-26 00:04:27 -0700176
Stephen Hemminger51069302007-11-19 19:18:11 -0800177 while ((skb = skb_dequeue(&npi->arp_tx)))
178 arp_reply(skb);
Neil Horman068c6e92006-06-26 00:04:27 -0700179 }
Neil Horman068c6e92006-06-26 00:04:27 -0700180}
181
WANG Cong0e34e932010-05-06 00:47:21 -0700182void netpoll_poll_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Pavel Emelyanov5e392732009-05-11 00:36:35 +0000184 const struct net_device_ops *ops;
Stephen Hemminger51069302007-11-19 19:18:11 -0800185
Pavel Emelyanov5e392732009-05-11 00:36:35 +0000186 if (!dev || !netif_running(dev))
187 return;
188
189 ops = dev->netdev_ops;
190 if (!ops->ndo_poll_controller)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return;
192
193 /* Process pending work on NIC */
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800194 ops->ndo_poll_controller(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Stephen Hemminger51069302007-11-19 19:18:11 -0800196 poll_napi(dev);
197
198 service_arp_queue(dev->npinfo);
Neil Horman068c6e92006-06-26 00:04:27 -0700199
David S. Miller3578b0c2010-08-03 00:24:04 -0700200 zap_completion_queue();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000202EXPORT_SYMBOL(netpoll_poll_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
WANG Cong0e34e932010-05-06 00:47:21 -0700204void netpoll_poll(struct netpoll *np)
205{
206 netpoll_poll_dev(np->dev);
207}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000208EXPORT_SYMBOL(netpoll_poll);
WANG Cong0e34e932010-05-06 00:47:21 -0700209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210static void refill_skbs(void)
211{
212 struct sk_buff *skb;
213 unsigned long flags;
214
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800215 spin_lock_irqsave(&skb_pool.lock, flags);
216 while (skb_pool.qlen < MAX_SKBS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
218 if (!skb)
219 break;
220
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800221 __skb_queue_tail(&skb_pool, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800223 spin_unlock_irqrestore(&skb_pool.lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
David S. Miller3578b0c2010-08-03 00:24:04 -0700226static void zap_completion_queue(void)
227{
228 unsigned long flags;
229 struct softnet_data *sd = &get_cpu_var(softnet_data);
230
231 if (sd->completion_queue) {
232 struct sk_buff *clist;
233
234 local_irq_save(flags);
235 clist = sd->completion_queue;
236 sd->completion_queue = NULL;
237 local_irq_restore(flags);
238
239 while (clist != NULL) {
240 struct sk_buff *skb = clist;
241 clist = clist->next;
242 if (skb->destructor) {
243 atomic_inc(&skb->users);
244 dev_kfree_skb_any(skb); /* put this one back */
245 } else {
246 __kfree_skb(skb);
247 }
248 }
249 }
250
251 put_cpu_var(softnet_data);
252}
253
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800254static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800256 int count = 0;
257 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
David S. Miller3578b0c2010-08-03 00:24:04 -0700259 zap_completion_queue();
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800260 refill_skbs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261repeat:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 skb = alloc_skb(len, GFP_ATOMIC);
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800264 if (!skb)
265 skb = skb_dequeue(&skb_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 if (!skb) {
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800268 if (++count < 10) {
269 netpoll_poll(np);
270 goto repeat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800272 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
274
275 atomic_set(&skb->users, 1);
276 skb_reserve(skb, reserve);
277 return skb;
278}
279
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700280static int netpoll_owner_active(struct net_device *dev)
281{
282 struct napi_struct *napi;
283
284 list_for_each_entry(napi, &dev->napi_list, dev_list) {
285 if (napi->poll_owner == smp_processor_id())
286 return 1;
287 }
288 return 0;
289}
290
Neil Hormanc2355e12010-10-13 16:01:49 +0000291void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
292 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700294 int status = NETDEV_TX_BUSY;
295 unsigned long tries;
Stephen Hemminger00829822008-11-20 20:14:53 -0800296 const struct net_device_ops *ops = dev->netdev_ops;
Herbert Xude85d992010-06-10 16:12:44 +0000297 /* It is up to the caller to keep npinfo alive. */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900298 struct netpoll_info *npinfo = np->dev->npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900300 if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
301 __kfree_skb(skb);
302 return;
303 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700305 /* don't get messages out of order, and no recursion */
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700306 if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700307 struct netdev_queue *txq;
Andrew Mortona49f99f2006-12-11 17:24:46 -0800308 unsigned long flags;
309
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700310 txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
311
Andrew Mortona49f99f2006-12-11 17:24:46 -0800312 local_irq_save(flags);
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700313 /* try until next clock tick */
314 for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
315 tries > 0; --tries) {
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700316 if (__netif_tx_trylock(txq)) {
Eric Dumazet08baf562009-05-25 22:58:01 -0700317 if (!netif_tx_queue_stopped(txq)) {
WANG Cong0e34e932010-05-06 00:47:21 -0700318 dev->priv_flags |= IFF_IN_NETPOLL;
Stephen Hemminger00829822008-11-20 20:14:53 -0800319 status = ops->ndo_start_xmit(skb, dev);
WANG Cong0e34e932010-05-06 00:47:21 -0700320 dev->priv_flags &= ~IFF_IN_NETPOLL;
Eric Dumazet08baf562009-05-25 22:58:01 -0700321 if (status == NETDEV_TX_OK)
322 txq_trans_update(txq);
323 }
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700324 __netif_tx_unlock(txq);
Matt Mackallf0d34592005-08-11 19:25:11 -0700325
Andrew Mortone37b8d92006-12-09 14:01:49 -0800326 if (status == NETDEV_TX_OK)
327 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Andrew Mortone37b8d92006-12-09 14:01:49 -0800329 }
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700330
331 /* tickle device maybe there is some cleanup */
332 netpoll_poll(np);
333
334 udelay(USEC_PER_POLL);
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700335 }
Dongdong Deng79b1bee2009-08-21 03:33:36 +0000336
337 WARN_ONCE(!irqs_disabled(),
338 "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n",
339 dev->name, ops->ndo_start_xmit);
340
Andrew Mortona49f99f2006-12-11 17:24:46 -0800341 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700344 if (status != NETDEV_TX_OK) {
Stephen Hemminger5de4a472006-10-26 15:46:55 -0700345 skb_queue_tail(&npinfo->txq, skb);
David Howells4c1ac1b2006-12-05 14:37:56 +0000346 schedule_delayed_work(&npinfo->tx_work,0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
Neil Hormanc2355e12010-10-13 16:01:49 +0000349EXPORT_SYMBOL(netpoll_send_skb_on_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
352{
353 int total_len, eth_len, ip_len, udp_len;
354 struct sk_buff *skb;
355 struct udphdr *udph;
356 struct iphdr *iph;
357 struct ethhdr *eth;
358
359 udp_len = len + sizeof(*udph);
360 ip_len = eth_len = udp_len + sizeof(*iph);
361 total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
362
363 skb = find_skb(np, total_len, total_len - len);
364 if (!skb)
365 return;
366
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300367 skb_copy_to_linear_data(skb, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 skb->len += len;
369
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300370 skb_push(skb, sizeof(*udph));
371 skb_reset_transport_header(skb);
372 udph = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 udph->source = htons(np->local_port);
374 udph->dest = htons(np->remote_port);
375 udph->len = htons(udp_len);
376 udph->check = 0;
Harvey Harrisone7557af2009-03-28 15:38:31 +0000377 udph->check = csum_tcpudp_magic(np->local_ip,
378 np->remote_ip,
Chris Lalancette8e365ee2006-11-07 14:56:19 -0800379 udp_len, IPPROTO_UDP,
Joe Perches07f07572008-11-19 15:44:53 -0800380 csum_partial(udph, udp_len, 0));
Chris Lalancette8e365ee2006-11-07 14:56:19 -0800381 if (udph->check == 0)
Al Viro5e57dff2006-11-20 18:08:13 -0800382 udph->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Arnaldo Carvalho de Meloe2d1bca2007-04-10 20:46:21 -0700384 skb_push(skb, sizeof(*iph));
385 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700386 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 /* iph->version = 4; iph->ihl = 5; */
389 put_unaligned(0x45, (unsigned char *)iph);
390 iph->tos = 0;
391 put_unaligned(htons(ip_len), &(iph->tot_len));
392 iph->id = 0;
393 iph->frag_off = 0;
394 iph->ttl = 64;
395 iph->protocol = IPPROTO_UDP;
396 iph->check = 0;
Harvey Harrisone7557af2009-03-28 15:38:31 +0000397 put_unaligned(np->local_ip, &(iph->saddr));
398 put_unaligned(np->remote_ip, &(iph->daddr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
400
401 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700402 skb_reset_mac_header(skb);
Stephen Hemminger206daaf2006-10-19 23:58:23 -0700403 skb->protocol = eth->h_proto = htons(ETH_P_IP);
Stephen Hemminger09538642007-11-19 19:23:29 -0800404 memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN);
405 memcpy(eth->h_dest, np->remote_mac, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 skb->dev = np->dev;
408
409 netpoll_send_skb(np, skb);
410}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000411EXPORT_SYMBOL(netpoll_send_udp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413static void arp_reply(struct sk_buff *skb)
414{
Jeff Moyer115c1d62005-06-22 22:05:31 -0700415 struct netpoll_info *npinfo = skb->dev->npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 struct arphdr *arp;
417 unsigned char *arp_ptr;
418 int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
Al Viro252e33462006-11-14 20:48:11 -0800419 __be32 sip, tip;
Neil Horman47bbec02006-12-08 00:05:55 -0800420 unsigned char *sha;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 struct sk_buff *send_skb;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000422 struct netpoll *np, *tmp;
423 unsigned long flags;
424 int hits = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000426 if (list_empty(&npinfo->rx_np))
427 return;
428
429 /* Before checking the packet, we do some early
430 inspection whether this is interesting at all */
431 spin_lock_irqsave(&npinfo->rx_lock, flags);
432 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
433 if (np->dev == skb->dev)
434 hits++;
435 }
436 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
437
438 /* No netpoll struct is using this dev */
439 if (!hits)
Jeff Moyer115c1d62005-06-22 22:05:31 -0700440 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 /* No arp on this interface */
443 if (skb->dev->flags & IFF_NOARP)
444 return;
445
Pavel Emelyanov988b7052008-03-03 12:20:57 -0800446 if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return;
448
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700449 skb_reset_network_header(skb);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300450 skb_reset_transport_header(skb);
Arnaldo Carvalho de Melod0a92be2007-03-12 20:56:31 -0300451 arp = arp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
454 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
455 arp->ar_pro != htons(ETH_P_IP) ||
456 arp->ar_op != htons(ARPOP_REQUEST))
457 return;
458
Neil Horman47bbec02006-12-08 00:05:55 -0800459 arp_ptr = (unsigned char *)(arp+1);
460 /* save the location of the src hw addr */
461 sha = arp_ptr;
462 arp_ptr += skb->dev->addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 memcpy(&sip, arp_ptr, 4);
Neil Horman47bbec02006-12-08 00:05:55 -0800464 arp_ptr += 4;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000465 /* If we actually cared about dst hw addr,
466 it would get copied here */
Neil Horman47bbec02006-12-08 00:05:55 -0800467 arp_ptr += skb->dev->addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 memcpy(&tip, arp_ptr, 4);
469
470 /* Should we ignore arp? */
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000471 if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return;
473
Pavel Emelyanov988b7052008-03-03 12:20:57 -0800474 size = arp_hdr_len(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000476 spin_lock_irqsave(&npinfo->rx_lock, flags);
477 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
478 if (tip != np->local_ip)
479 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000481 send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
482 LL_RESERVED_SPACE(np->dev));
483 if (!send_skb)
484 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000486 skb_reset_network_header(send_skb);
487 arp = (struct arphdr *) skb_put(send_skb, size);
488 send_skb->dev = skb->dev;
489 send_skb->protocol = htons(ETH_P_ARP);
490
491 /* Fill the device header for the ARP frame */
492 if (dev_hard_header(send_skb, skb->dev, ptype,
493 sha, np->dev->dev_addr,
494 send_skb->len) < 0) {
495 kfree_skb(send_skb);
496 continue;
497 }
498
499 /*
500 * Fill out the arp protocol part.
501 *
502 * we only support ethernet device type,
503 * which (according to RFC 1390) should
504 * always equal 1 (Ethernet).
505 */
506
507 arp->ar_hrd = htons(np->dev->type);
508 arp->ar_pro = htons(ETH_P_IP);
509 arp->ar_hln = np->dev->addr_len;
510 arp->ar_pln = 4;
511 arp->ar_op = htons(type);
512
513 arp_ptr = (unsigned char *)(arp + 1);
514 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
515 arp_ptr += np->dev->addr_len;
516 memcpy(arp_ptr, &tip, 4);
517 arp_ptr += 4;
518 memcpy(arp_ptr, sha, np->dev->addr_len);
519 arp_ptr += np->dev->addr_len;
520 memcpy(arp_ptr, &sip, 4);
521
522 netpoll_send_skb(np, send_skb);
523
524 /* If there are several rx_hooks for the same address,
525 we're fine by sending a single reply */
526 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000528 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
531int __netpoll_rx(struct sk_buff *skb)
532{
533 int proto, len, ulen;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000534 int hits = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 struct iphdr *iph;
536 struct udphdr *uh;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000537 struct netpoll_info *npinfo = skb->dev->npinfo;
538 struct netpoll *np, *tmp;
Neil Horman068c6e92006-06-26 00:04:27 -0700539
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000540 if (list_empty(&npinfo->rx_np))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 goto out;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 if (skb->dev->type != ARPHRD_ETHER)
544 goto out;
545
David S. Millerd9452e92008-03-04 12:28:49 -0800546 /* check if netpoll clients need ARP */
YOSHIFUJI Hideaki724800d2007-03-25 20:13:04 -0700547 if (skb->protocol == htons(ETH_P_ARP) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 atomic_read(&trapped)) {
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000549 skb_queue_tail(&npinfo->arp_tx, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 return 1;
551 }
552
553 proto = ntohs(eth_hdr(skb)->h_proto);
554 if (proto != ETH_P_IP)
555 goto out;
556 if (skb->pkt_type == PACKET_OTHERHOST)
557 goto out;
558 if (skb_shared(skb))
559 goto out;
560
561 iph = (struct iphdr *)skb->data;
562 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
563 goto out;
564 if (iph->ihl < 5 || iph->version != 4)
565 goto out;
566 if (!pskb_may_pull(skb, iph->ihl*4))
567 goto out;
568 if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
569 goto out;
570
571 len = ntohs(iph->tot_len);
572 if (skb->len < len || len < iph->ihl*4)
573 goto out;
574
Aubrey.Li5e7d7fa2007-04-17 12:40:20 -0700575 /*
576 * Our transport medium may have padded the buffer out.
577 * Now We trim to the true length of the frame.
578 */
579 if (pskb_trim_rcsum(skb, len))
580 goto out;
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 if (iph->protocol != IPPROTO_UDP)
583 goto out;
584
585 len -= iph->ihl*4;
586 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
587 ulen = ntohs(uh->len);
588
589 if (ulen != len)
590 goto out;
Herbert Xufb286bb2005-11-10 13:01:24 -0800591 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000594 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
595 if (np->local_ip && np->local_ip != iph->daddr)
596 continue;
597 if (np->remote_ip && np->remote_ip != iph->saddr)
598 continue;
599 if (np->local_port && np->local_port != ntohs(uh->dest))
600 continue;
601
602 np->rx_hook(np, ntohs(uh->source),
603 (char *)(uh+1),
604 ulen - sizeof(struct udphdr));
605 hits++;
606 }
607
608 if (!hits)
609 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 kfree_skb(skb);
612 return 1;
613
614out:
615 if (atomic_read(&trapped)) {
616 kfree_skb(skb);
617 return 1;
618 }
619
620 return 0;
621}
622
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700623void netpoll_print_options(struct netpoll *np)
624{
625 printk(KERN_INFO "%s: local port %d\n",
626 np->name, np->local_port);
Harvey Harrisone7557af2009-03-28 15:38:31 +0000627 printk(KERN_INFO "%s: local IP %pI4\n",
628 np->name, &np->local_ip);
Amerigo Wang5fc05f82010-03-21 22:59:58 +0000629 printk(KERN_INFO "%s: interface '%s'\n",
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700630 np->name, np->dev_name);
631 printk(KERN_INFO "%s: remote port %d\n",
632 np->name, np->remote_port);
Harvey Harrisone7557af2009-03-28 15:38:31 +0000633 printk(KERN_INFO "%s: remote IP %pI4\n",
634 np->name, &np->remote_ip);
Johannes Berge1749612008-10-27 15:59:26 -0700635 printk(KERN_INFO "%s: remote ethernet address %pM\n",
636 np->name, np->remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700637}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000638EXPORT_SYMBOL(netpoll_print_options);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640int netpoll_parse_options(struct netpoll *np, char *opt)
641{
642 char *cur=opt, *delim;
643
David S. Millerc68b9072006-11-14 20:40:49 -0800644 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if ((delim = strchr(cur, '@')) == NULL)
646 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800647 *delim = 0;
648 np->local_port = simple_strtol(cur, NULL, 10);
649 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 }
651 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
David S. Millerc68b9072006-11-14 20:40:49 -0800653 if (*cur != '/') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if ((delim = strchr(cur, '/')) == NULL)
655 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800656 *delim = 0;
Harvey Harrisone7557af2009-03-28 15:38:31 +0000657 np->local_ip = in_aton(cur);
David S. Millerc68b9072006-11-14 20:40:49 -0800658 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660 cur++;
661
David S. Millerc68b9072006-11-14 20:40:49 -0800662 if (*cur != ',') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 /* parse out dev name */
664 if ((delim = strchr(cur, ',')) == NULL)
665 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800666 *delim = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
David S. Millerc68b9072006-11-14 20:40:49 -0800668 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 }
670 cur++;
671
David S. Millerc68b9072006-11-14 20:40:49 -0800672 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 /* dst port */
674 if ((delim = strchr(cur, '@')) == NULL)
675 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800676 *delim = 0;
Amerigo Wang5fc05f82010-03-21 22:59:58 +0000677 if (*cur == ' ' || *cur == '\t')
678 printk(KERN_INFO "%s: warning: whitespace"
679 "is not allowed\n", np->name);
David S. Millerc68b9072006-11-14 20:40:49 -0800680 np->remote_port = simple_strtol(cur, NULL, 10);
681 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 }
683 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 /* dst ip */
686 if ((delim = strchr(cur, '/')) == NULL)
687 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800688 *delim = 0;
Harvey Harrisone7557af2009-03-28 15:38:31 +0000689 np->remote_ip = in_aton(cur);
David S. Millerc68b9072006-11-14 20:40:49 -0800690 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
David S. Millerc68b9072006-11-14 20:40:49 -0800692 if (*cur != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 /* MAC address */
694 if ((delim = strchr(cur, ':')) == NULL)
695 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800696 *delim = 0;
697 np->remote_mac[0] = simple_strtol(cur, NULL, 16);
698 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if ((delim = strchr(cur, ':')) == NULL)
700 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800701 *delim = 0;
702 np->remote_mac[1] = simple_strtol(cur, NULL, 16);
703 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 if ((delim = strchr(cur, ':')) == NULL)
705 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800706 *delim = 0;
707 np->remote_mac[2] = simple_strtol(cur, NULL, 16);
708 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 if ((delim = strchr(cur, ':')) == NULL)
710 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800711 *delim = 0;
712 np->remote_mac[3] = simple_strtol(cur, NULL, 16);
713 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 if ((delim = strchr(cur, ':')) == NULL)
715 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800716 *delim = 0;
717 np->remote_mac[4] = simple_strtol(cur, NULL, 16);
718 cur = delim + 1;
719 np->remote_mac[5] = simple_strtol(cur, NULL, 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 }
721
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700722 netpoll_print_options(np);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 return 0;
725
726 parse_failed:
Amerigo Wang5fc05f82010-03-21 22:59:58 +0000727 printk(KERN_INFO "%s: couldn't parse config at '%s'!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 np->name, cur);
729 return -1;
730}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000731EXPORT_SYMBOL(netpoll_parse_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000733int __netpoll_setup(struct netpoll *np)
734{
735 struct net_device *ndev = np->dev;
736 struct netpoll_info *npinfo;
737 const struct net_device_ops *ops;
738 unsigned long flags;
739 int err;
740
741 if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) ||
742 !ndev->netdev_ops->ndo_poll_controller) {
743 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
744 np->name, np->dev_name);
745 err = -ENOTSUPP;
746 goto out;
747 }
748
749 if (!ndev->npinfo) {
750 npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
751 if (!npinfo) {
752 err = -ENOMEM;
753 goto out;
754 }
755
756 npinfo->rx_flags = 0;
757 INIT_LIST_HEAD(&npinfo->rx_np);
758
759 spin_lock_init(&npinfo->rx_lock);
760 skb_queue_head_init(&npinfo->arp_tx);
761 skb_queue_head_init(&npinfo->txq);
762 INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
763
764 atomic_set(&npinfo->refcnt, 1);
765
766 ops = np->dev->netdev_ops;
767 if (ops->ndo_netpoll_setup) {
768 err = ops->ndo_netpoll_setup(ndev, npinfo);
769 if (err)
770 goto free_npinfo;
771 }
772 } else {
773 npinfo = ndev->npinfo;
774 atomic_inc(&npinfo->refcnt);
775 }
776
777 npinfo->netpoll = np;
778
779 if (np->rx_hook) {
780 spin_lock_irqsave(&npinfo->rx_lock, flags);
781 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
782 list_add_tail(&np->rx, &npinfo->rx_np);
783 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
784 }
785
786 /* last thing to do is link it to the net device structure */
787 rcu_assign_pointer(ndev->npinfo, npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000788
789 return 0;
790
791free_npinfo:
792 kfree(npinfo);
793out:
794 return err;
795}
796EXPORT_SYMBOL_GPL(__netpoll_setup);
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798int netpoll_setup(struct netpoll *np)
799{
800 struct net_device *ndev = NULL;
801 struct in_device *in_dev;
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700802 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
804 if (np->dev_name)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700805 ndev = dev_get_by_name(&init_net, np->dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (!ndev) {
807 printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
808 np->name, np->dev_name);
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700809 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 }
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (!netif_running(ndev)) {
813 unsigned long atmost, atleast;
814
815 printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
816 np->name, np->dev_name);
817
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800818 rtnl_lock();
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700819 err = dev_open(ndev);
820 rtnl_unlock();
821
822 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 printk(KERN_ERR "%s: failed to open %s\n",
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700824 np->name, ndev->name);
Herbert Xudbaa1542010-06-10 16:12:46 +0000825 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828 atleast = jiffies + HZ/10;
Anton Vorontsovbff38772009-07-08 11:10:56 -0700829 atmost = jiffies + carrier_timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 while (!netif_carrier_ok(ndev)) {
831 if (time_after(jiffies, atmost)) {
832 printk(KERN_NOTICE
833 "%s: timeout waiting for carrier\n",
834 np->name);
835 break;
836 }
Anton Vorontsov1b614fb2009-07-08 20:09:44 -0700837 msleep(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 }
839
840 /* If carrier appears to come up instantly, we don't
841 * trust it and pause so that we don't pump all our
842 * queued console messages into the bitbucket.
843 */
844
845 if (time_before(jiffies, atleast)) {
846 printk(KERN_NOTICE "%s: carrier detect appears"
847 " untrustworthy, waiting 4 seconds\n",
848 np->name);
849 msleep(4000);
850 }
851 }
852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 if (!np->local_ip) {
854 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700855 in_dev = __in_dev_get_rcu(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
857 if (!in_dev || !in_dev->ifa_list) {
858 rcu_read_unlock();
859 printk(KERN_ERR "%s: no IP address for %s, aborting\n",
860 np->name, np->dev_name);
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700861 err = -EDESTADDRREQ;
Herbert Xudbaa1542010-06-10 16:12:46 +0000862 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 }
864
Harvey Harrisone7557af2009-03-28 15:38:31 +0000865 np->local_ip = in_dev->ifa_list->ifa_local;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 rcu_read_unlock();
Harvey Harrisone7557af2009-03-28 15:38:31 +0000867 printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 }
869
Herbert Xudbaa1542010-06-10 16:12:46 +0000870 np->dev = ndev;
871
872 /* fill up the skb queue */
873 refill_skbs();
874
875 rtnl_lock();
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000876 err = __netpoll_setup(np);
Herbert Xudbaa1542010-06-10 16:12:46 +0000877 rtnl_unlock();
Matt Mackall53fb95d2005-08-11 19:27:43 -0700878
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000879 if (err)
880 goto put;
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 return 0;
883
Jiri Slaby21edbb22010-03-16 05:29:54 +0000884put:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 dev_put(ndev);
Stephen Hemmingerb41848b2006-10-26 15:46:52 -0700886 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000888EXPORT_SYMBOL(netpoll_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
David S. Millerc68b9072006-11-14 20:40:49 -0800890static int __init netpoll_init(void)
891{
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800892 skb_queue_head_init(&skb_pool);
893 return 0;
894}
895core_initcall(netpoll_init);
896
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000897void __netpoll_cleanup(struct netpoll *np)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700899 struct netpoll_info *npinfo;
900 unsigned long flags;
901
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000902 npinfo = np->dev->npinfo;
903 if (!npinfo)
Herbert Xudbaa1542010-06-10 16:12:46 +0000904 return;
Stephen Hemminger93ec2c72006-10-26 15:46:50 -0700905
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000906 if (!list_empty(&npinfo->rx_np)) {
907 spin_lock_irqsave(&npinfo->rx_lock, flags);
908 list_del(&np->rx);
909 if (list_empty(&npinfo->rx_np))
910 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
911 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Jeff Moyer115c1d62005-06-22 22:05:31 -0700912 }
Herbert Xudbaa1542010-06-10 16:12:46 +0000913
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000914 if (atomic_dec_and_test(&npinfo->refcnt)) {
915 const struct net_device_ops *ops;
916
917 ops = np->dev->netdev_ops;
918 if (ops->ndo_netpoll_cleanup)
919 ops->ndo_netpoll_cleanup(np->dev);
920
921 rcu_assign_pointer(np->dev->npinfo, NULL);
922
Herbert Xudbaa1542010-06-10 16:12:46 +0000923 /* avoid racing with NAPI reading npinfo */
924 synchronize_rcu_bh();
925
926 skb_queue_purge(&npinfo->arp_tx);
927 skb_queue_purge(&npinfo->txq);
928 cancel_rearming_delayed_work(&npinfo->tx_work);
929
930 /* clean after last, unfinished work */
931 __skb_queue_purge(&npinfo->txq);
932 kfree(npinfo);
933 }
Herbert Xu8fdd95e2010-06-10 16:12:48 +0000934}
935EXPORT_SYMBOL_GPL(__netpoll_cleanup);
936
937void netpoll_cleanup(struct netpoll *np)
938{
939 if (!np->dev)
940 return;
941
942 rtnl_lock();
943 __netpoll_cleanup(np);
944 rtnl_unlock();
Herbert Xudbaa1542010-06-10 16:12:46 +0000945
946 dev_put(np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 np->dev = NULL;
948}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000949EXPORT_SYMBOL(netpoll_cleanup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951int netpoll_trap(void)
952{
953 return atomic_read(&trapped);
954}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000955EXPORT_SYMBOL(netpoll_trap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957void netpoll_set_trap(int trap)
958{
959 if (trap)
960 atomic_inc(&trapped);
961 else
962 atomic_dec(&trapped);
963}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964EXPORT_SYMBOL(netpoll_set_trap);