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ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option
[pv_ops_mirror.git] / net / core / netpoll.c
blob4b7e756181c9ec96eea6b0f5397aec3c87008a5a
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
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/string.h>
15 #include <linux/if_arp.h>
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
37 static struct sk_buff_head skb_pool;
38
39 static atomic_t trapped;
40
41 #define USEC_PER_POLL 50
42 #define NETPOLL_RX_ENABLED 1
43 #define NETPOLL_RX_DROP 2
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);
50 static void arp_reply(struct sk_buff *skb);
51
52 static void queue_process(struct work_struct *work)
53 {
54 struct netpoll_info *npinfo =
55 container_of(work, struct netpoll_info, tx_work.work);
56 struct sk_buff *skb;
57 unsigned long flags;
58
59 while ((skb = skb_dequeue(&npinfo->txq))) {
60 struct net_device *dev = skb->dev;
61
62 if (!netif_device_present(dev) || !netif_running(dev)) {
63 __kfree_skb(skb);
64 continue;
65 }
66
67 local_irq_save(flags);
68 netif_tx_lock(dev);
69 if ((netif_queue_stopped(dev) ||
70 netif_subqueue_stopped(dev, skb)) ||
71 dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
72 skb_queue_head(&npinfo->txq, skb);
73 netif_tx_unlock(dev);
74 local_irq_restore(flags);
75
76 schedule_delayed_work(&npinfo->tx_work, HZ/10);
77 return;
78 }
79 netif_tx_unlock(dev);
80 local_irq_restore(flags);
81 }
82 }
83
84 static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
85 unsigned short ulen, __be32 saddr, __be32 daddr)
86 {
87 __wsum psum;
88
89 if (uh->check == 0 || skb_csum_unnecessary(skb))
90 return 0;
91
92 psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
93
94 if (skb->ip_summed == CHECKSUM_COMPLETE &&
95 !csum_fold(csum_add(psum, skb->csum)))
96 return 0;
97
98 skb->csum = psum;
99
100 return __skb_checksum_complete(skb);
101 }
102
103 /*
104 * Check whether delayed processing was scheduled for our NIC. If so,
105 * we attempt to grab the poll lock and use ->poll() to pump the card.
106 * If this fails, either we've recursed in ->poll() or it's already
107 * running on another CPU.
108 *
109 * Note: we don't mask interrupts with this lock because we're using
110 * trylock here and interrupts are already disabled in the softirq
111 * case. Further, we test the poll_owner to avoid recursion on UP
112 * systems where the lock doesn't exist.
113 *
114 * In cases where there is bi-directional communications, reading only
115 * one message at a time can lead to packets being dropped by the
116 * network adapter, forcing superfluous retries and possibly timeouts.
117 * Thus, we set our budget to greater than 1.
118 */
119 static int poll_one_napi(struct netpoll_info *npinfo,
120 struct napi_struct *napi, int budget)
121 {
122 int work;
123
124 /* net_rx_action's ->poll() invocations and our's are
125 * synchronized by this test which is only made while
126 * holding the napi->poll_lock.
127 */
128 if (!test_bit(NAPI_STATE_SCHED, &napi->state))
129 return budget;
130
131 npinfo->rx_flags |= NETPOLL_RX_DROP;
132 atomic_inc(&trapped);
133
134 work = napi->poll(napi, budget);
135
136 atomic_dec(&trapped);
137 npinfo->rx_flags &= ~NETPOLL_RX_DROP;
138
139 return budget - work;
140 }
141
142 static void poll_napi(struct net_device *dev)
143 {
144 struct napi_struct *napi;
145 int budget = 16;
146
147 list_for_each_entry(napi, &dev->napi_list, dev_list) {
148 if (napi->poll_owner != smp_processor_id() &&
149 spin_trylock(&napi->poll_lock)) {
150 budget = poll_one_napi(dev->npinfo, napi, budget);
151 spin_unlock(&napi->poll_lock);
152
153 if (!budget)
154 break;
155 }
156 }
157 }
158
159 static void service_arp_queue(struct netpoll_info *npi)
160 {
161 if (npi) {
162 struct sk_buff *skb;
163
164 while ((skb = skb_dequeue(&npi->arp_tx)))
165 arp_reply(skb);
166 }
167 }
168
169 void netpoll_poll(struct netpoll *np)
170 {
171 struct net_device *dev = np->dev;
172
173 if (!dev || !netif_running(dev) || !dev->poll_controller)
174 return;
175
176 /* Process pending work on NIC */
177 dev->poll_controller(dev);
178
179 poll_napi(dev);
180
181 service_arp_queue(dev->npinfo);
182
183 zap_completion_queue();
184 }
185
186 static void refill_skbs(void)
187 {
188 struct sk_buff *skb;
189 unsigned long flags;
190
191 spin_lock_irqsave(&skb_pool.lock, flags);
192 while (skb_pool.qlen < MAX_SKBS) {
193 skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
194 if (!skb)
195 break;
196
197 __skb_queue_tail(&skb_pool, skb);
198 }
199 spin_unlock_irqrestore(&skb_pool.lock, flags);
200 }
201
202 static void zap_completion_queue(void)
203 {
204 unsigned long flags;
205 struct softnet_data *sd = &get_cpu_var(softnet_data);
206
207 if (sd->completion_queue) {
208 struct sk_buff *clist;
209
210 local_irq_save(flags);
211 clist = sd->completion_queue;
212 sd->completion_queue = NULL;
213 local_irq_restore(flags);
214
215 while (clist != NULL) {
216 struct sk_buff *skb = clist;
217 clist = clist->next;
218 if (skb->destructor)
219 dev_kfree_skb_any(skb); /* put this one back */
220 else
221 __kfree_skb(skb);
222 }
223 }
224
225 put_cpu_var(softnet_data);
226 }
227
228 static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
229 {
230 int count = 0;
231 struct sk_buff *skb;
232
233 zap_completion_queue();
234 refill_skbs();
235 repeat:
236
237 skb = alloc_skb(len, GFP_ATOMIC);
238 if (!skb)
239 skb = skb_dequeue(&skb_pool);
240
241 if (!skb) {
242 if (++count < 10) {
243 netpoll_poll(np);
244 goto repeat;
245 }
246 return NULL;
247 }
248
249 atomic_set(&skb->users, 1);
250 skb_reserve(skb, reserve);
251 return skb;
252 }
253
254 static int netpoll_owner_active(struct net_device *dev)
255 {
256 struct napi_struct *napi;
257
258 list_for_each_entry(napi, &dev->napi_list, dev_list) {
259 if (napi->poll_owner == smp_processor_id())
260 return 1;
261 }
262 return 0;
263 }
264
265 static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
266 {
267 int status = NETDEV_TX_BUSY;
268 unsigned long tries;
269 struct net_device *dev = np->dev;
270 struct netpoll_info *npinfo = np->dev->npinfo;
271
272 if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
273 __kfree_skb(skb);
274 return;
275 }
276
277 /* don't get messages out of order, and no recursion */
278 if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
279 unsigned long flags;
280
281 local_irq_save(flags);
282 /* try until next clock tick */
283 for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
284 tries > 0; --tries) {
285 if (netif_tx_trylock(dev)) {
286 if (!netif_queue_stopped(dev) &&
287 !netif_subqueue_stopped(dev, skb))
288 status = dev->hard_start_xmit(skb, dev);
289 netif_tx_unlock(dev);
290
291 if (status == NETDEV_TX_OK)
292 break;
293
294 }
295
296 /* tickle device maybe there is some cleanup */
297 netpoll_poll(np);
298
299 udelay(USEC_PER_POLL);
300 }
301 local_irq_restore(flags);
302 }
303
304 if (status != NETDEV_TX_OK) {
305 skb_queue_tail(&npinfo->txq, skb);
306 schedule_delayed_work(&npinfo->tx_work,0);
307 }
308 }
309
310 void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
311 {
312 int total_len, eth_len, ip_len, udp_len;
313 struct sk_buff *skb;
314 struct udphdr *udph;
315 struct iphdr *iph;
316 struct ethhdr *eth;
317
318 udp_len = len + sizeof(*udph);
319 ip_len = eth_len = udp_len + sizeof(*iph);
320 total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
321
322 skb = find_skb(np, total_len, total_len - len);
323 if (!skb)
324 return;
325
326 skb_copy_to_linear_data(skb, msg, len);
327 skb->len += len;
328
329 skb_push(skb, sizeof(*udph));
330 skb_reset_transport_header(skb);
331 udph = udp_hdr(skb);
332 udph->source = htons(np->local_port);
333 udph->dest = htons(np->remote_port);
334 udph->len = htons(udp_len);
335 udph->check = 0;
336 udph->check = csum_tcpudp_magic(htonl(np->local_ip),
337 htonl(np->remote_ip),
338 udp_len, IPPROTO_UDP,
339 csum_partial((unsigned char *)udph, udp_len, 0));
340 if (udph->check == 0)
341 udph->check = CSUM_MANGLED_0;
342
343 skb_push(skb, sizeof(*iph));
344 skb_reset_network_header(skb);
345 iph = ip_hdr(skb);
346
347 /* iph->version = 4; iph->ihl = 5; */
348 put_unaligned(0x45, (unsigned char *)iph);
349 iph->tos = 0;
350 put_unaligned(htons(ip_len), &(iph->tot_len));
351 iph->id = 0;
352 iph->frag_off = 0;
353 iph->ttl = 64;
354 iph->protocol = IPPROTO_UDP;
355 iph->check = 0;
356 put_unaligned(htonl(np->local_ip), &(iph->saddr));
357 put_unaligned(htonl(np->remote_ip), &(iph->daddr));
358 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
359
360 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
361 skb_reset_mac_header(skb);
362 skb->protocol = eth->h_proto = htons(ETH_P_IP);
363 memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN);
364 memcpy(eth->h_dest, np->remote_mac, ETH_ALEN);
365
366 skb->dev = np->dev;
367
368 netpoll_send_skb(np, skb);
369 }
370
371 static void arp_reply(struct sk_buff *skb)
372 {
373 struct netpoll_info *npinfo = skb->dev->npinfo;
374 struct arphdr *arp;
375 unsigned char *arp_ptr;
376 int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
377 __be32 sip, tip;
378 unsigned char *sha;
379 struct sk_buff *send_skb;
380 struct netpoll *np = NULL;
381
382 if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
383 np = npinfo->rx_np;
384 if (!np)
385 return;
386
387 /* No arp on this interface */
388 if (skb->dev->flags & IFF_NOARP)
389 return;
390
391 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
392 (2 * skb->dev->addr_len) +
393 (2 * sizeof(u32)))))
394 return;
395
396 skb_reset_network_header(skb);
397 skb_reset_transport_header(skb);
398 arp = arp_hdr(skb);
399
400 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
401 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
402 arp->ar_pro != htons(ETH_P_IP) ||
403 arp->ar_op != htons(ARPOP_REQUEST))
404 return;
405
406 arp_ptr = (unsigned char *)(arp+1);
407 /* save the location of the src hw addr */
408 sha = arp_ptr;
409 arp_ptr += skb->dev->addr_len;
410 memcpy(&sip, arp_ptr, 4);
411 arp_ptr += 4;
412 /* if we actually cared about dst hw addr, it would get copied here */
413 arp_ptr += skb->dev->addr_len;
414 memcpy(&tip, arp_ptr, 4);
415
416 /* Should we ignore arp? */
417 if (tip != htonl(np->local_ip) ||
418 ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
419 return;
420
421 size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4);
422 send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev),
423 LL_RESERVED_SPACE(np->dev));
424
425 if (!send_skb)
426 return;
427
428 skb_reset_network_header(send_skb);
429 arp = (struct arphdr *) skb_put(send_skb, size);
430 send_skb->dev = skb->dev;
431 send_skb->protocol = htons(ETH_P_ARP);
432
433 /* Fill the device header for the ARP frame */
434 if (dev_hard_header(send_skb, skb->dev, ptype,
435 sha, np->dev->dev_addr,
436 send_skb->len) < 0) {
437 kfree_skb(send_skb);
438 return;
439 }
440
441 /*
442 * Fill out the arp protocol part.
443 *
444 * we only support ethernet device type,
445 * which (according to RFC 1390) should always equal 1 (Ethernet).
446 */
447
448 arp->ar_hrd = htons(np->dev->type);
449 arp->ar_pro = htons(ETH_P_IP);
450 arp->ar_hln = np->dev->addr_len;
451 arp->ar_pln = 4;
452 arp->ar_op = htons(type);
453
454 arp_ptr=(unsigned char *)(arp + 1);
455 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
456 arp_ptr += np->dev->addr_len;
457 memcpy(arp_ptr, &tip, 4);
458 arp_ptr += 4;
459 memcpy(arp_ptr, sha, np->dev->addr_len);
460 arp_ptr += np->dev->addr_len;
461 memcpy(arp_ptr, &sip, 4);
462
463 netpoll_send_skb(np, send_skb);
464 }
465
466 int __netpoll_rx(struct sk_buff *skb)
467 {
468 int proto, len, ulen;
469 struct iphdr *iph;
470 struct udphdr *uh;
471 struct netpoll_info *npi = skb->dev->npinfo;
472 struct netpoll *np = npi->rx_np;
473
474 if (!np)
475 goto out;
476 if (skb->dev->type != ARPHRD_ETHER)
477 goto out;
478
479 /* check if netpoll clients need ARP */
480 if (skb->protocol == htons(ETH_P_ARP) &&
481 atomic_read(&trapped)) {
482 skb_queue_tail(&npi->arp_tx, skb);
483 return 1;
484 }
485
486 proto = ntohs(eth_hdr(skb)->h_proto);
487 if (proto != ETH_P_IP)
488 goto out;
489 if (skb->pkt_type == PACKET_OTHERHOST)
490 goto out;
491 if (skb_shared(skb))
492 goto out;
493
494 iph = (struct iphdr *)skb->data;
495 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
496 goto out;
497 if (iph->ihl < 5 || iph->version != 4)
498 goto out;
499 if (!pskb_may_pull(skb, iph->ihl*4))
500 goto out;
501 if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
502 goto out;
503
504 len = ntohs(iph->tot_len);
505 if (skb->len < len || len < iph->ihl*4)
506 goto out;
507
508 /*
509 * Our transport medium may have padded the buffer out.
510 * Now We trim to the true length of the frame.
511 */
512 if (pskb_trim_rcsum(skb, len))
513 goto out;
514
515 if (iph->protocol != IPPROTO_UDP)
516 goto out;
517
518 len -= iph->ihl*4;
519 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
520 ulen = ntohs(uh->len);
521
522 if (ulen != len)
523 goto out;
524 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
525 goto out;
526 if (np->local_ip && np->local_ip != ntohl(iph->daddr))
527 goto out;
528 if (np->remote_ip && np->remote_ip != ntohl(iph->saddr))
529 goto out;
530 if (np->local_port && np->local_port != ntohs(uh->dest))
531 goto out;
532
533 np->rx_hook(np, ntohs(uh->source),
534 (char *)(uh+1),
535 ulen - sizeof(struct udphdr));
536
537 kfree_skb(skb);
538 return 1;
539
540 out:
541 if (atomic_read(&trapped)) {
542 kfree_skb(skb);
543 return 1;
544 }
545
546 return 0;
547 }
548
549 void netpoll_print_options(struct netpoll *np)
550 {
551 DECLARE_MAC_BUF(mac);
552 printk(KERN_INFO "%s: local port %d\n",
553 np->name, np->local_port);
554 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
555 np->name, HIPQUAD(np->local_ip));
556 printk(KERN_INFO "%s: interface %s\n",
557 np->name, np->dev_name);
558 printk(KERN_INFO "%s: remote port %d\n",
559 np->name, np->remote_port);
560 printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
561 np->name, HIPQUAD(np->remote_ip));
562 printk(KERN_INFO "%s: remote ethernet address %s\n",
563 np->name, print_mac(mac, np->remote_mac));
564 }
565
566 int netpoll_parse_options(struct netpoll *np, char *opt)
567 {
568 char *cur=opt, *delim;
569
570 if (*cur != '@') {
571 if ((delim = strchr(cur, '@')) == NULL)
572 goto parse_failed;
573 *delim = 0;
574 np->local_port = simple_strtol(cur, NULL, 10);
575 cur = delim;
576 }
577 cur++;
578
579 if (*cur != '/') {
580 if ((delim = strchr(cur, '/')) == NULL)
581 goto parse_failed;
582 *delim = 0;
583 np->local_ip = ntohl(in_aton(cur));
584 cur = delim;
585 }
586 cur++;
587
588 if (*cur != ',') {
589 /* parse out dev name */
590 if ((delim = strchr(cur, ',')) == NULL)
591 goto parse_failed;
592 *delim = 0;
593 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
594 cur = delim;
595 }
596 cur++;
597
598 if (*cur != '@') {
599 /* dst port */
600 if ((delim = strchr(cur, '@')) == NULL)
601 goto parse_failed;
602 *delim = 0;
603 np->remote_port = simple_strtol(cur, NULL, 10);
604 cur = delim;
605 }
606 cur++;
607
608 /* dst ip */
609 if ((delim = strchr(cur, '/')) == NULL)
610 goto parse_failed;
611 *delim = 0;
612 np->remote_ip = ntohl(in_aton(cur));
613 cur = delim + 1;
614
615 if (*cur != 0) {
616 /* MAC address */
617 if ((delim = strchr(cur, ':')) == NULL)
618 goto parse_failed;
619 *delim = 0;
620 np->remote_mac[0] = simple_strtol(cur, NULL, 16);
621 cur = delim + 1;
622 if ((delim = strchr(cur, ':')) == NULL)
623 goto parse_failed;
624 *delim = 0;
625 np->remote_mac[1] = simple_strtol(cur, NULL, 16);
626 cur = delim + 1;
627 if ((delim = strchr(cur, ':')) == NULL)
628 goto parse_failed;
629 *delim = 0;
630 np->remote_mac[2] = simple_strtol(cur, NULL, 16);
631 cur = delim + 1;
632 if ((delim = strchr(cur, ':')) == NULL)
633 goto parse_failed;
634 *delim = 0;
635 np->remote_mac[3] = simple_strtol(cur, NULL, 16);
636 cur = delim + 1;
637 if ((delim = strchr(cur, ':')) == NULL)
638 goto parse_failed;
639 *delim = 0;
640 np->remote_mac[4] = simple_strtol(cur, NULL, 16);
641 cur = delim + 1;
642 np->remote_mac[5] = simple_strtol(cur, NULL, 16);
643 }
644
645 netpoll_print_options(np);
646
647 return 0;
648
649 parse_failed:
650 printk(KERN_INFO "%s: couldn't parse config at %s!\n",
651 np->name, cur);
652 return -1;
653 }
654
655 int netpoll_setup(struct netpoll *np)
656 {
657 struct net_device *ndev = NULL;
658 struct in_device *in_dev;
659 struct netpoll_info *npinfo;
660 unsigned long flags;
661 int err;
662
663 if (np->dev_name)
664 ndev = dev_get_by_name(&init_net, np->dev_name);
665 if (!ndev) {
666 printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
667 np->name, np->dev_name);
668 return -ENODEV;
669 }
670
671 np->dev = ndev;
672 if (!ndev->npinfo) {
673 npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
674 if (!npinfo) {
675 err = -ENOMEM;
676 goto release;
677 }
678
679 npinfo->rx_flags = 0;
680 npinfo->rx_np = NULL;
681
682 spin_lock_init(&npinfo->rx_lock);
683 skb_queue_head_init(&npinfo->arp_tx);
684 skb_queue_head_init(&npinfo->txq);
685 INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
686
687 atomic_set(&npinfo->refcnt, 1);
688 } else {
689 npinfo = ndev->npinfo;
690 atomic_inc(&npinfo->refcnt);
691 }
692
693 if (!ndev->poll_controller) {
694 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
695 np->name, np->dev_name);
696 err = -ENOTSUPP;
697 goto release;
698 }
699
700 if (!netif_running(ndev)) {
701 unsigned long atmost, atleast;
702
703 printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
704 np->name, np->dev_name);
705
706 rtnl_lock();
707 err = dev_open(ndev);
708 rtnl_unlock();
709
710 if (err) {
711 printk(KERN_ERR "%s: failed to open %s\n",
712 np->name, ndev->name);
713 goto release;
714 }
715
716 atleast = jiffies + HZ/10;
717 atmost = jiffies + 4*HZ;
718 while (!netif_carrier_ok(ndev)) {
719 if (time_after(jiffies, atmost)) {
720 printk(KERN_NOTICE
721 "%s: timeout waiting for carrier\n",
722 np->name);
723 break;
724 }
725 cond_resched();
726 }
727
728 /* If carrier appears to come up instantly, we don't
729 * trust it and pause so that we don't pump all our
730 * queued console messages into the bitbucket.
731 */
732
733 if (time_before(jiffies, atleast)) {
734 printk(KERN_NOTICE "%s: carrier detect appears"
735 " untrustworthy, waiting 4 seconds\n",
736 np->name);
737 msleep(4000);
738 }
739 }
740
741 if (!np->local_ip) {
742 rcu_read_lock();
743 in_dev = __in_dev_get_rcu(ndev);
744
745 if (!in_dev || !in_dev->ifa_list) {
746 rcu_read_unlock();
747 printk(KERN_ERR "%s: no IP address for %s, aborting\n",
748 np->name, np->dev_name);
749 err = -EDESTADDRREQ;
750 goto release;
751 }
752
753 np->local_ip = ntohl(in_dev->ifa_list->ifa_local);
754 rcu_read_unlock();
755 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
756 np->name, HIPQUAD(np->local_ip));
757 }
758
759 if (np->rx_hook) {
760 spin_lock_irqsave(&npinfo->rx_lock, flags);
761 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
762 npinfo->rx_np = np;
763 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
764 }
765
766 /* fill up the skb queue */
767 refill_skbs();
768
769 /* last thing to do is link it to the net device structure */
770 ndev->npinfo = npinfo;
771
772 /* avoid racing with NAPI reading npinfo */
773 synchronize_rcu();
774
775 return 0;
776
777 release:
778 if (!ndev->npinfo)
779 kfree(npinfo);
780 np->dev = NULL;
781 dev_put(ndev);
782 return err;
783 }
784
785 static int __init netpoll_init(void)
786 {
787 skb_queue_head_init(&skb_pool);
788 return 0;
789 }
790 core_initcall(netpoll_init);
791
792 void netpoll_cleanup(struct netpoll *np)
793 {
794 struct netpoll_info *npinfo;
795 unsigned long flags;
796
797 if (np->dev) {
798 npinfo = np->dev->npinfo;
799 if (npinfo) {
800 if (npinfo->rx_np == np) {
801 spin_lock_irqsave(&npinfo->rx_lock, flags);
802 npinfo->rx_np = NULL;
803 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
804 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
805 }
806
807 if (atomic_dec_and_test(&npinfo->refcnt)) {
808 skb_queue_purge(&npinfo->arp_tx);
809 skb_queue_purge(&npinfo->txq);
810 cancel_rearming_delayed_work(&npinfo->tx_work);
811
812 /* clean after last, unfinished work */
813 __skb_queue_purge(&npinfo->txq);
814 kfree(npinfo);
815 np->dev->npinfo = NULL;
816 }
817 }
818
819 dev_put(np->dev);
820 }
821
822 np->dev = NULL;
823 }
824
825 int netpoll_trap(void)
826 {
827 return atomic_read(&trapped);
828 }
829
830 void netpoll_set_trap(int trap)
831 {
832 if (trap)
833 atomic_inc(&trapped);
834 else
835 atomic_dec(&trapped);
836 }
837
838 EXPORT_SYMBOL(netpoll_set_trap);
839 EXPORT_SYMBOL(netpoll_trap);
840 EXPORT_SYMBOL(netpoll_print_options);
841 EXPORT_SYMBOL(netpoll_parse_options);
842 EXPORT_SYMBOL(netpoll_setup);
843 EXPORT_SYMBOL(netpoll_cleanup);
844 EXPORT_SYMBOL(netpoll_send_udp);
845 EXPORT_SYMBOL(netpoll_poll);
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