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[deliverable/linux.git] / net / core / netpoll.c
CommitLineData
1da177e4
LT		 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/smp_lock.h>
13#include <linux/netdevice.h>
14#include <linux/etherdevice.h>
15#include <linux/string.h>
14c85021 16#include <linux/if_arp.h>
1da177e4
LT		 17#include <linux/inetdevice.h>
18#include <linux/inet.h>
19#include <linux/interrupt.h>
20#include <linux/netpoll.h>
21#include <linux/sched.h>
22#include <linux/delay.h>
23#include <linux/rcupdate.h>
24#include <linux/workqueue.h>
25#include <net/tcp.h>
26#include <net/udp.h>
27#include <asm/unaligned.h>
28
29/*
30 * We maintain a small pool of fully-sized skbs, to make sure the
31 * message gets out even in extreme OOM situations.
32 */
33
34#define MAX_UDP_CHUNK 1460
35#define MAX_SKBS 32
36#define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
0db1d6fc 37#define MAX_RETRIES 20000
1da177e4
LT		 38
39static DEFINE_SPINLOCK(skb_list_lock);
40static int nr_skbs;
41static struct sk_buff *skbs;
42
43static DEFINE_SPINLOCK(queue_lock);
44static int queue_depth;
45static struct sk_buff *queue_head, *queue_tail;
46
47static atomic_t trapped;
48
49#define NETPOLL_RX_ENABLED 1
50#define NETPOLL_RX_DROP 2
51
52#define MAX_SKB_SIZE \
53 (MAX_UDP_CHUNK + sizeof(struct udphdr) + \
54 sizeof(struct iphdr) + sizeof(struct ethhdr))
55
56static void zap_completion_queue(void);
068c6e98 57static void arp_reply(struct sk_buff *skb);
1da177e4 58
c4028958 59static void queue_process(struct work_struct *work)
1da177e4
LT		 60{
61 unsigned long flags;
62 struct sk_buff *skb;
63
64 while (queue_head) {
65 spin_lock_irqsave(&queue_lock, flags);
66
67 skb = queue_head;
68 queue_head = skb->next;
69 if (skb == queue_tail)
70 queue_head = NULL;
71
72 queue_depth--;
73
74 spin_unlock_irqrestore(&queue_lock, flags);
75
76 dev_queue_xmit(skb);
77 }
78}
79
c4028958 80static DECLARE_WORK(send_queue, queue_process);
1da177e4
LT		 81
82void netpoll_queue(struct sk_buff *skb)
83{
84 unsigned long flags;
85
86 if (queue_depth == MAX_QUEUE_DEPTH) {
87 __kfree_skb(skb);
88 return;
89 }
90
91 spin_lock_irqsave(&queue_lock, flags);
92 if (!queue_head)
93 queue_head = skb;
94 else
95 queue_tail->next = skb;
96 queue_tail = skb;
97 queue_depth++;
98 spin_unlock_irqrestore(&queue_lock, flags);
99
100 schedule_work(&send_queue);
101}
102
103static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
104 unsigned short ulen, u32 saddr, u32 daddr)
105{
fb286bb2
HX		 106 unsigned int psum;
107
108 if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY)
1da177e4
LT		 109 return 0;
110
fb286bb2
HX		 111 psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
112
84fa7933 113 if (skb->ip_summed == CHECKSUM_COMPLETE &&
fb286bb2
HX		 114 !(u16)csum_fold(csum_add(psum, skb->csum)))
115 return 0;
1da177e4 116
fb286bb2 117 skb->csum = psum;
1da177e4 118
fb286bb2 119 return __skb_checksum_complete(skb);
1da177e4
LT		 120}
121
122/*
123 * Check whether delayed processing was scheduled for our NIC. If so,
124 * we attempt to grab the poll lock and use ->poll() to pump the card.
125 * If this fails, either we've recursed in ->poll() or it's already
126 * running on another CPU.
127 *
128 * Note: we don't mask interrupts with this lock because we're using
129 * trylock here and interrupts are already disabled in the softirq
130 * case. Further, we test the poll_owner to avoid recursion on UP
131 * systems where the lock doesn't exist.
132 *
133 * In cases where there is bi-directional communications, reading only
134 * one message at a time can lead to packets being dropped by the
135 * network adapter, forcing superfluous retries and possibly timeouts.
136 * Thus, we set our budget to greater than 1.
137 */
138static void poll_napi(struct netpoll *np)
139{
115c1d6e 140 struct netpoll_info *npinfo = np->dev->npinfo;
1da177e4
LT		 141 int budget = 16;
142
143 if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&
115c1d6e
JM		 144 npinfo->poll_owner != smp_processor_id() &&
145 spin_trylock(&npinfo->poll_lock)) {
146 npinfo->rx_flags |= NETPOLL_RX_DROP;
1da177e4
LT		 147 atomic_inc(&trapped);
148
149 np->dev->poll(np->dev, &budget);
150
151 atomic_dec(&trapped);
115c1d6e
JM		 152 npinfo->rx_flags &= ~NETPOLL_RX_DROP;
153 spin_unlock(&npinfo->poll_lock);
1da177e4
LT		 154 }
155}
156
068c6e98
NH		 157static void service_arp_queue(struct netpoll_info *npi)
158{
159 struct sk_buff *skb;
160
161 if (unlikely(!npi))
162 return;
163
164 skb = skb_dequeue(&npi->arp_tx);
165
166 while (skb != NULL) {
167 arp_reply(skb);
168 skb = skb_dequeue(&npi->arp_tx);
169 }
170 return;
171}
172
1da177e4
LT		 173void netpoll_poll(struct netpoll *np)
174{
175 if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
176 return;
177
178 /* Process pending work on NIC */
179 np->dev->poll_controller(np->dev);
180 if (np->dev->poll)
181 poll_napi(np);
182
068c6e98
NH		 183 service_arp_queue(np->dev->npinfo);
184
1da177e4
LT		 185 zap_completion_queue();
186}
187
188static void refill_skbs(void)
189{
190 struct sk_buff *skb;
191 unsigned long flags;
192
193 spin_lock_irqsave(&skb_list_lock, flags);
194 while (nr_skbs < MAX_SKBS) {
195 skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
196 if (!skb)
197 break;
198
199 skb->next = skbs;
200 skbs = skb;
201 nr_skbs++;
202 }
203 spin_unlock_irqrestore(&skb_list_lock, flags);
204}
205
206static void zap_completion_queue(void)
207{
208 unsigned long flags;
209 struct softnet_data *sd = &get_cpu_var(softnet_data);
210
211 if (sd->completion_queue) {
212 struct sk_buff *clist;
213
214 local_irq_save(flags);
215 clist = sd->completion_queue;
216 sd->completion_queue = NULL;
217 local_irq_restore(flags);
218
219 while (clist != NULL) {
220 struct sk_buff *skb = clist;
221 clist = clist->next;
222 if(skb->destructor)
223 dev_kfree_skb_any(skb); /* put this one back */
224 else
225 __kfree_skb(skb);
226 }
227 }
228
229 put_cpu_var(softnet_data);
230}
231
232static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve)
233{
234 int once = 1, count = 0;
235 unsigned long flags;
236 struct sk_buff *skb = NULL;
237
238 zap_completion_queue();
239repeat:
240 if (nr_skbs < MAX_SKBS)
241 refill_skbs();
242
243 skb = alloc_skb(len, GFP_ATOMIC);
244
245 if (!skb) {
246 spin_lock_irqsave(&skb_list_lock, flags);
247 skb = skbs;
248 if (skb) {
249 skbs = skb->next;
250 skb->next = NULL;
251 nr_skbs--;
252 }
253 spin_unlock_irqrestore(&skb_list_lock, flags);
254 }
255
256 if(!skb) {
257 count++;
258 if (once && (count == 1000000)) {
259 printk("out of netpoll skbs!\n");
260 once = 0;
261 }
262 netpoll_poll(np);
263 goto repeat;
264 }
265
266 atomic_set(&skb->users, 1);
267 skb_reserve(skb, reserve);
268 return skb;
269}
270
271static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
272{
273 int status;
115c1d6e 274 struct netpoll_info *npinfo;
1da177e4 275
f0d3459d 276 if (!np || !np->dev || !netif_running(np->dev)) {
1da177e4
LT		 277 __kfree_skb(skb);
278 return;
279 }
280
115c1d6e 281 npinfo = np->dev->npinfo;
f0d3459d
MM		 282
283 /* avoid recursion */
115c1d6e
JM		 284 if (npinfo->poll_owner == smp_processor_id() ||
285 np->dev->xmit_lock_owner == smp_processor_id()) {
1da177e4
LT		 286 if (np->drop)
287 np->drop(skb);
288 else
289 __kfree_skb(skb);
290 return;
291 }
292
0db1d6fc
MM		 293 do {
294 npinfo->tries--;
932ff279 295 netif_tx_lock(np->dev);
f0d3459d
MM		 296
297 /*
298 * network drivers do not expect to be called if the queue is
299 * stopped.
300 */
8834807b
JF		 301 status = NETDEV_TX_BUSY;
302 if (!netif_queue_stopped(np->dev))
303 status = np->dev->hard_start_xmit(skb, np->dev);
1da177e4 304
932ff279 305 netif_tx_unlock(np->dev);
1da177e4 306
f0d3459d 307 /* success */
0db1d6fc
MM		 308 if(!status) {
309 npinfo->tries = MAX_RETRIES; /* reset */
f0d3459d 310 return;
0db1d6fc 311 }
1da177e4 312
f0d3459d 313 /* transmit busy */
1da177e4 314 netpoll_poll(np);
0db1d6fc
MM		 315 udelay(50);
316 } while (npinfo->tries > 0);
1da177e4
LT		 317}
318
319void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
320{
321 int total_len, eth_len, ip_len, udp_len;
322 struct sk_buff *skb;
323 struct udphdr *udph;
324 struct iphdr *iph;
325 struct ethhdr *eth;
326
327 udp_len = len + sizeof(*udph);
328 ip_len = eth_len = udp_len + sizeof(*iph);
329 total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
330
331 skb = find_skb(np, total_len, total_len - len);
332 if (!skb)
333 return;
334
335 memcpy(skb->data, msg, len);
336 skb->len += len;
337
206daaf7 338 skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
1da177e4
LT		 339 udph->source = htons(np->local_port);
340 udph->dest = htons(np->remote_port);
341 udph->len = htons(udp_len);
342 udph->check = 0;
8e365eec
CL		 343 udph->check = csum_tcpudp_magic(htonl(np->local_ip),
344 htonl(np->remote_ip),
345 udp_len, IPPROTO_UDP,
346 csum_partial((unsigned char *)udph, udp_len, 0));
347 if (udph->check == 0)
348 udph->check = -1;
1da177e4 349
206daaf7 350 skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
1da177e4
LT		 351
352 /* iph->version = 4; iph->ihl = 5; */
353 put_unaligned(0x45, (unsigned char *)iph);
354 iph->tos = 0;
355 put_unaligned(htons(ip_len), &(iph->tot_len));
356 iph->id = 0;
357 iph->frag_off = 0;
358 iph->ttl = 64;
359 iph->protocol = IPPROTO_UDP;
360 iph->check = 0;
361 put_unaligned(htonl(np->local_ip), &(iph->saddr));
362 put_unaligned(htonl(np->remote_ip), &(iph->daddr));
363 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
364
365 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
206daaf7
SH		 366 skb->mac.raw = skb->data;
367 skb->protocol = eth->h_proto = htons(ETH_P_IP);
1da177e4
LT		 368 memcpy(eth->h_source, np->local_mac, 6);
369 memcpy(eth->h_dest, np->remote_mac, 6);
370
371 skb->dev = np->dev;
372
373 netpoll_send_skb(np, skb);
374}
375
376static void arp_reply(struct sk_buff *skb)
377{
115c1d6e 378 struct netpoll_info *npinfo = skb->dev->npinfo;
1da177e4
LT		 379 struct arphdr *arp;
380 unsigned char *arp_ptr;
381 int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
382 u32 sip, tip;
383 struct sk_buff *send_skb;
115c1d6e 384 struct netpoll *np = NULL;
1da177e4 385
fbeec2e1
JM		 386 if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
387 np = npinfo->rx_np;
115c1d6e
JM		 388 if (!np)
389 return;
1da177e4
LT		 390
391 /* No arp on this interface */
392 if (skb->dev->flags & IFF_NOARP)
393 return;
394
395 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
396 (2 * skb->dev->addr_len) +
397 (2 * sizeof(u32)))))
398 return;
399
400 skb->h.raw = skb->nh.raw = skb->data;
401 arp = skb->nh.arph;
402
403 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
404 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
405 arp->ar_pro != htons(ETH_P_IP) ||
406 arp->ar_op != htons(ARPOP_REQUEST))
407 return;
408
409 arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len;
410 memcpy(&sip, arp_ptr, 4);
411 arp_ptr += 4 + skb->dev->addr_len;
412 memcpy(&tip, arp_ptr, 4);
413
414 /* Should we ignore arp? */
415 if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip))
416 return;
417
418 size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4);
419 send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev),
420 LL_RESERVED_SPACE(np->dev));
421
422 if (!send_skb)
423 return;
424
425 send_skb->nh.raw = send_skb->data;
426 arp = (struct arphdr *) skb_put(send_skb, size);
427 send_skb->dev = skb->dev;
428 send_skb->protocol = htons(ETH_P_ARP);
429
430 /* Fill the device header for the ARP frame */
431
432 if (np->dev->hard_header &&
433 np->dev->hard_header(send_skb, skb->dev, ptype,
434 np->remote_mac, np->local_mac,
435 send_skb->len) < 0) {
436 kfree_skb(send_skb);
437 return;
438 }
439
440 /*
441 * Fill out the arp protocol part.
442 *
443 * we only support ethernet device type,
444 * which (according to RFC 1390) should always equal 1 (Ethernet).
445 */
446
447 arp->ar_hrd = htons(np->dev->type);
448 arp->ar_pro = htons(ETH_P_IP);
449 arp->ar_hln = np->dev->addr_len;
450 arp->ar_pln = 4;
451 arp->ar_op = htons(type);
452
453 arp_ptr=(unsigned char *)(arp + 1);
454 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
455 arp_ptr += np->dev->addr_len;
456 memcpy(arp_ptr, &tip, 4);
457 arp_ptr += 4;
458 memcpy(arp_ptr, np->remote_mac, np->dev->addr_len);
459 arp_ptr += np->dev->addr_len;
460 memcpy(arp_ptr, &sip, 4);
461
462 netpoll_send_skb(np, send_skb);
463}
464
465int __netpoll_rx(struct sk_buff *skb)
466{
467 int proto, len, ulen;
468 struct iphdr *iph;
469 struct udphdr *uh;
068c6e98
NH		 470 struct netpoll_info *npi = skb->dev->npinfo;
471 struct netpoll *np = npi->rx_np;
472
1da177e4 473
fbeec2e1 474 if (!np)
1da177e4
LT		 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 == __constant_htons(ETH_P_ARP) &&
481 atomic_read(&trapped)) {
068c6e98 482 skb_queue_tail(&npi->arp_tx, skb);
1da177e4
LT		 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 if (iph->protocol != IPPROTO_UDP)
509 goto out;
510
511 len -= iph->ihl*4;
512 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
513 ulen = ntohs(uh->len);
514
515 if (ulen != len)
516 goto out;
fb286bb2 517 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
1da177e4
LT		 518 goto out;
519 if (np->local_ip && np->local_ip != ntohl(iph->daddr))
520 goto out;
521 if (np->remote_ip && np->remote_ip != ntohl(iph->saddr))
522 goto out;
523 if (np->local_port && np->local_port != ntohs(uh->dest))
524 goto out;
525
526 np->rx_hook(np, ntohs(uh->source),
527 (char *)(uh+1),
528 ulen - sizeof(struct udphdr));
529
530 kfree_skb(skb);
531 return 1;
532
533out:
534 if (atomic_read(&trapped)) {
535 kfree_skb(skb);
536 return 1;
537 }
538
539 return 0;
540}
541
542int netpoll_parse_options(struct netpoll *np, char *opt)
543{
544 char *cur=opt, *delim;
545
546 if(*cur != '@') {
547 if ((delim = strchr(cur, '@')) == NULL)
548 goto parse_failed;
549 *delim=0;
550 np->local_port=simple_strtol(cur, NULL, 10);
551 cur=delim;
552 }
553 cur++;
554 printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
555
556 if(*cur != '/') {
557 if ((delim = strchr(cur, '/')) == NULL)
558 goto parse_failed;
559 *delim=0;
560 np->local_ip=ntohl(in_aton(cur));
561 cur=delim;
562
563 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
564 np->name, HIPQUAD(np->local_ip));
565 }
566 cur++;
567
568 if ( *cur != ',') {
569 /* parse out dev name */
570 if ((delim = strchr(cur, ',')) == NULL)
571 goto parse_failed;
572 *delim=0;
573 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
574 cur=delim;
575 }
576 cur++;
577
578 printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
579
580 if ( *cur != '@' ) {
581 /* dst port */
582 if ((delim = strchr(cur, '@')) == NULL)
583 goto parse_failed;
584 *delim=0;
585 np->remote_port=simple_strtol(cur, NULL, 10);
586 cur=delim;
587 }
588 cur++;
589 printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
590
591 /* dst ip */
592 if ((delim = strchr(cur, '/')) == NULL)
593 goto parse_failed;
594 *delim=0;
595 np->remote_ip=ntohl(in_aton(cur));
596 cur=delim+1;
597
598 printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
599 np->name, HIPQUAD(np->remote_ip));
600
601 if( *cur != 0 )
602 {
603 /* MAC address */
604 if ((delim = strchr(cur, ':')) == NULL)
605 goto parse_failed;
606 *delim=0;
607 np->remote_mac[0]=simple_strtol(cur, NULL, 16);
608 cur=delim+1;
609 if ((delim = strchr(cur, ':')) == NULL)
610 goto parse_failed;
611 *delim=0;
612 np->remote_mac[1]=simple_strtol(cur, NULL, 16);
613 cur=delim+1;
614 if ((delim = strchr(cur, ':')) == NULL)
615 goto parse_failed;
616 *delim=0;
617 np->remote_mac[2]=simple_strtol(cur, NULL, 16);
618 cur=delim+1;
619 if ((delim = strchr(cur, ':')) == NULL)
620 goto parse_failed;
621 *delim=0;
622 np->remote_mac[3]=simple_strtol(cur, NULL, 16);
623 cur=delim+1;
624 if ((delim = strchr(cur, ':')) == NULL)
625 goto parse_failed;
626 *delim=0;
627 np->remote_mac[4]=simple_strtol(cur, NULL, 16);
628 cur=delim+1;
629 np->remote_mac[5]=simple_strtol(cur, NULL, 16);
630 }
631
632 printk(KERN_INFO "%s: remote ethernet address "
633 "%02x:%02x:%02x:%02x:%02x:%02x\n",
634 np->name,
635 np->remote_mac[0],
636 np->remote_mac[1],
637 np->remote_mac[2],
638 np->remote_mac[3],
639 np->remote_mac[4],
640 np->remote_mac[5]);
641
642 return 0;
643
644 parse_failed:
645 printk(KERN_INFO "%s: couldn't parse config at %s!\n",
646 np->name, cur);
647 return -1;
648}
649
650int netpoll_setup(struct netpoll *np)
651{
652 struct net_device *ndev = NULL;
653 struct in_device *in_dev;
115c1d6e 654 struct netpoll_info *npinfo;
fbeec2e1 655 unsigned long flags;
1da177e4
LT		 656
657 if (np->dev_name)
658 ndev = dev_get_by_name(np->dev_name);
659 if (!ndev) {
660 printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
661 np->name, np->dev_name);
662 return -1;
663 }
664
665 np->dev = ndev;
115c1d6e
JM		 666 if (!ndev->npinfo) {
667 npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
668 if (!npinfo)
669 goto release;
670
11513128 671 npinfo->rx_flags = 0;
fbeec2e1 672 npinfo->rx_np = NULL;
a9f6a0dd 673 spin_lock_init(&npinfo->poll_lock);
115c1d6e 674 npinfo->poll_owner = -1;
0db1d6fc 675 npinfo->tries = MAX_RETRIES;
a9f6a0dd 676 spin_lock_init(&npinfo->rx_lock);
068c6e98 677 skb_queue_head_init(&npinfo->arp_tx);
115c1d6e
JM		 678 } else
679 npinfo = ndev->npinfo;
1da177e4
LT		 680
681 if (!ndev->poll_controller) {
682 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
683 np->name, np->dev_name);
684 goto release;
685 }
686
687 if (!netif_running(ndev)) {
688 unsigned long atmost, atleast;
689
690 printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
691 np->name, np->dev_name);
692
6756ae4b 693 rtnl_lock();
1da177e4
LT		 694 if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
695 printk(KERN_ERR "%s: failed to open %s\n",
696 np->name, np->dev_name);
6756ae4b 697 rtnl_unlock();
1da177e4
LT		 698 goto release;
699 }
6756ae4b 700 rtnl_unlock();
1da177e4
LT		 701
702 atleast = jiffies + HZ/10;
703 atmost = jiffies + 4*HZ;
704 while (!netif_carrier_ok(ndev)) {
705 if (time_after(jiffies, atmost)) {
706 printk(KERN_NOTICE
707 "%s: timeout waiting for carrier\n",
708 np->name);
709 break;
710 }
711 cond_resched();
712 }
713
714 /* If carrier appears to come up instantly, we don't
715 * trust it and pause so that we don't pump all our
716 * queued console messages into the bitbucket.
717 */
718
719 if (time_before(jiffies, atleast)) {
720 printk(KERN_NOTICE "%s: carrier detect appears"
721 " untrustworthy, waiting 4 seconds\n",
722 np->name);
723 msleep(4000);
724 }
725 }
726
3860288e 727 if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr)
1da177e4
LT		 728 memcpy(np->local_mac, ndev->dev_addr, 6);
729
730 if (!np->local_ip) {
731 rcu_read_lock();
e5ed6399 732 in_dev = __in_dev_get_rcu(ndev);
1da177e4
LT		 733
734 if (!in_dev || !in_dev->ifa_list) {
735 rcu_read_unlock();
736 printk(KERN_ERR "%s: no IP address for %s, aborting\n",
737 np->name, np->dev_name);
738 goto release;
739 }
740
741 np->local_ip = ntohl(in_dev->ifa_list->ifa_local);
742 rcu_read_unlock();
743 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
744 np->name, HIPQUAD(np->local_ip));
745 }
746
fbeec2e1
JM		 747 if (np->rx_hook) {
748 spin_lock_irqsave(&npinfo->rx_lock, flags);
749 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
750 npinfo->rx_np = np;
751 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
752 }
26520765
IM		 753
754 /* fill up the skb queue */
755 refill_skbs();
756
fbeec2e1 757 /* last thing to do is link it to the net device structure */
115c1d6e 758 ndev->npinfo = npinfo;
1da177e4 759
53fb95d3
MM		 760 /* avoid racing with NAPI reading npinfo */
761 synchronize_rcu();
762
1da177e4
LT		 763 return 0;
764
765 release:
115c1d6e
JM		 766 if (!ndev->npinfo)
767 kfree(npinfo);
1da177e4
LT		 768 np->dev = NULL;
769 dev_put(ndev);
770 return -1;
771}
772
773void netpoll_cleanup(struct netpoll *np)
774{
fbeec2e1
JM		 775 struct netpoll_info *npinfo;
776 unsigned long flags;
777
115c1d6e 778 if (np->dev) {
fbeec2e1
JM		 779 npinfo = np->dev->npinfo;
780 if (npinfo && npinfo->rx_np == np) {
781 spin_lock_irqsave(&npinfo->rx_lock, flags);
782 npinfo->rx_np = NULL;
783 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
784 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
785 }
115c1d6e
JM		 786 dev_put(np->dev);
787 }
fbeec2e1 788
1da177e4
LT		 789 np->dev = NULL;
790}
791
792int netpoll_trap(void)
793{
794 return atomic_read(&trapped);
795}
796
797void netpoll_set_trap(int trap)
798{
799 if (trap)
800 atomic_inc(&trapped);
801 else
802 atomic_dec(&trapped);
803}
804
805EXPORT_SYMBOL(netpoll_set_trap);
806EXPORT_SYMBOL(netpoll_trap);
807EXPORT_SYMBOL(netpoll_parse_options);
808EXPORT_SYMBOL(netpoll_setup);
809EXPORT_SYMBOL(netpoll_cleanup);
810EXPORT_SYMBOL(netpoll_send_udp);
811EXPORT_SYMBOL(netpoll_poll);
812EXPORT_SYMBOL(netpoll_queue);
Linux kernel - Deliverables
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