blob: c02a08da6d42a3f59afee93de979e81e090d633f [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
12#include <linux/smp_lock.h>
13#include <linux/netdevice.h>
14#include <linux/etherdevice.h>
15#include <linux/string.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)
Matt Mackall0db1d6f2005-08-11 19:25:54 -070036#define MAX_RETRIES 20000
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38static DEFINE_SPINLOCK(skb_list_lock);
39static int nr_skbs;
40static struct sk_buff *skbs;
41
42static DEFINE_SPINLOCK(queue_lock);
43static int queue_depth;
44static struct sk_buff *queue_head, *queue_tail;
45
46static atomic_t trapped;
47
48#define NETPOLL_RX_ENABLED 1
49#define NETPOLL_RX_DROP 2
50
51#define MAX_SKB_SIZE \
52 (MAX_UDP_CHUNK + sizeof(struct udphdr) + \
53 sizeof(struct iphdr) + sizeof(struct ethhdr))
54
55static void zap_completion_queue(void);
56
57static void queue_process(void *p)
58{
59 unsigned long flags;
60 struct sk_buff *skb;
61
62 while (queue_head) {
63 spin_lock_irqsave(&queue_lock, flags);
64
65 skb = queue_head;
66 queue_head = skb->next;
67 if (skb == queue_tail)
68 queue_head = NULL;
69
70 queue_depth--;
71
72 spin_unlock_irqrestore(&queue_lock, flags);
73
74 dev_queue_xmit(skb);
75 }
76}
77
78static DECLARE_WORK(send_queue, queue_process, NULL);
79
80void netpoll_queue(struct sk_buff *skb)
81{
82 unsigned long flags;
83
84 if (queue_depth == MAX_QUEUE_DEPTH) {
85 __kfree_skb(skb);
86 return;
87 }
88
89 spin_lock_irqsave(&queue_lock, flags);
90 if (!queue_head)
91 queue_head = skb;
92 else
93 queue_tail->next = skb;
94 queue_tail = skb;
95 queue_depth++;
96 spin_unlock_irqrestore(&queue_lock, flags);
97
98 schedule_work(&send_queue);
99}
100
101static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
102 unsigned short ulen, u32 saddr, u32 daddr)
103{
104 if (uh->check == 0)
105 return 0;
106
107 if (skb->ip_summed == CHECKSUM_HW)
108 return csum_tcpudp_magic(
109 saddr, daddr, ulen, IPPROTO_UDP, skb->csum);
110
111 skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
112
113 return csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
114}
115
116/*
117 * Check whether delayed processing was scheduled for our NIC. If so,
118 * we attempt to grab the poll lock and use ->poll() to pump the card.
119 * If this fails, either we've recursed in ->poll() or it's already
120 * running on another CPU.
121 *
122 * Note: we don't mask interrupts with this lock because we're using
123 * trylock here and interrupts are already disabled in the softirq
124 * case. Further, we test the poll_owner to avoid recursion on UP
125 * systems where the lock doesn't exist.
126 *
127 * In cases where there is bi-directional communications, reading only
128 * one message at a time can lead to packets being dropped by the
129 * network adapter, forcing superfluous retries and possibly timeouts.
130 * Thus, we set our budget to greater than 1.
131 */
132static void poll_napi(struct netpoll *np)
133{
Jeff Moyer115c1d62005-06-22 22:05:31 -0700134 struct netpoll_info *npinfo = np->dev->npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 int budget = 16;
136
137 if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&
Jeff Moyer115c1d62005-06-22 22:05:31 -0700138 npinfo->poll_owner != smp_processor_id() &&
139 spin_trylock(&npinfo->poll_lock)) {
140 npinfo->rx_flags |= NETPOLL_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 atomic_inc(&trapped);
142
143 np->dev->poll(np->dev, &budget);
144
145 atomic_dec(&trapped);
Jeff Moyer115c1d62005-06-22 22:05:31 -0700146 npinfo->rx_flags &= ~NETPOLL_RX_DROP;
147 spin_unlock(&npinfo->poll_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
149}
150
151void netpoll_poll(struct netpoll *np)
152{
153 if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
154 return;
155
156 /* Process pending work on NIC */
157 np->dev->poll_controller(np->dev);
158 if (np->dev->poll)
159 poll_napi(np);
160
161 zap_completion_queue();
162}
163
164static void refill_skbs(void)
165{
166 struct sk_buff *skb;
167 unsigned long flags;
168
169 spin_lock_irqsave(&skb_list_lock, flags);
170 while (nr_skbs < MAX_SKBS) {
171 skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
172 if (!skb)
173 break;
174
175 skb->next = skbs;
176 skbs = skb;
177 nr_skbs++;
178 }
179 spin_unlock_irqrestore(&skb_list_lock, flags);
180}
181
182static void zap_completion_queue(void)
183{
184 unsigned long flags;
185 struct softnet_data *sd = &get_cpu_var(softnet_data);
186
187 if (sd->completion_queue) {
188 struct sk_buff *clist;
189
190 local_irq_save(flags);
191 clist = sd->completion_queue;
192 sd->completion_queue = NULL;
193 local_irq_restore(flags);
194
195 while (clist != NULL) {
196 struct sk_buff *skb = clist;
197 clist = clist->next;
198 if(skb->destructor)
199 dev_kfree_skb_any(skb); /* put this one back */
200 else
201 __kfree_skb(skb);
202 }
203 }
204
205 put_cpu_var(softnet_data);
206}
207
208static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve)
209{
210 int once = 1, count = 0;
211 unsigned long flags;
212 struct sk_buff *skb = NULL;
213
214 zap_completion_queue();
215repeat:
216 if (nr_skbs < MAX_SKBS)
217 refill_skbs();
218
219 skb = alloc_skb(len, GFP_ATOMIC);
220
221 if (!skb) {
222 spin_lock_irqsave(&skb_list_lock, flags);
223 skb = skbs;
224 if (skb) {
225 skbs = skb->next;
226 skb->next = NULL;
227 nr_skbs--;
228 }
229 spin_unlock_irqrestore(&skb_list_lock, flags);
230 }
231
232 if(!skb) {
233 count++;
234 if (once && (count == 1000000)) {
235 printk("out of netpoll skbs!\n");
236 once = 0;
237 }
238 netpoll_poll(np);
239 goto repeat;
240 }
241
242 atomic_set(&skb->users, 1);
243 skb_reserve(skb, reserve);
244 return skb;
245}
246
247static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
248{
249 int status;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700250 struct netpoll_info *npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Matt Mackallf0d34592005-08-11 19:25:11 -0700252 if (!np || !np->dev || !netif_running(np->dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 __kfree_skb(skb);
254 return;
255 }
256
Jeff Moyer115c1d62005-06-22 22:05:31 -0700257 npinfo = np->dev->npinfo;
Matt Mackallf0d34592005-08-11 19:25:11 -0700258
259 /* avoid recursion */
Jeff Moyer115c1d62005-06-22 22:05:31 -0700260 if (npinfo->poll_owner == smp_processor_id() ||
261 np->dev->xmit_lock_owner == smp_processor_id()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (np->drop)
263 np->drop(skb);
264 else
265 __kfree_skb(skb);
266 return;
267 }
268
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700269 do {
270 npinfo->tries--;
Matt Mackallf0d34592005-08-11 19:25:11 -0700271 spin_lock(&np->dev->xmit_lock);
272 np->dev->xmit_lock_owner = smp_processor_id();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Matt Mackallf0d34592005-08-11 19:25:11 -0700274 /*
275 * network drivers do not expect to be called if the queue is
276 * stopped.
277 */
278 if (netif_queue_stopped(np->dev)) {
279 np->dev->xmit_lock_owner = -1;
280 spin_unlock(&np->dev->xmit_lock);
281 netpoll_poll(np);
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700282 udelay(50);
Matt Mackallf0d34592005-08-11 19:25:11 -0700283 continue;
284 }
285
286 status = np->dev->hard_start_xmit(skb, np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 np->dev->xmit_lock_owner = -1;
288 spin_unlock(&np->dev->xmit_lock);
289
Matt Mackallf0d34592005-08-11 19:25:11 -0700290 /* success */
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700291 if(!status) {
292 npinfo->tries = MAX_RETRIES; /* reset */
Matt Mackallf0d34592005-08-11 19:25:11 -0700293 return;
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700294 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Matt Mackallf0d34592005-08-11 19:25:11 -0700296 /* transmit busy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 netpoll_poll(np);
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700298 udelay(50);
299 } while (npinfo->tries > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
303{
304 int total_len, eth_len, ip_len, udp_len;
305 struct sk_buff *skb;
306 struct udphdr *udph;
307 struct iphdr *iph;
308 struct ethhdr *eth;
309
310 udp_len = len + sizeof(*udph);
311 ip_len = eth_len = udp_len + sizeof(*iph);
312 total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
313
314 skb = find_skb(np, total_len, total_len - len);
315 if (!skb)
316 return;
317
318 memcpy(skb->data, msg, len);
319 skb->len += len;
320
321 udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
322 udph->source = htons(np->local_port);
323 udph->dest = htons(np->remote_port);
324 udph->len = htons(udp_len);
325 udph->check = 0;
326
327 iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
328
329 /* iph->version = 4; iph->ihl = 5; */
330 put_unaligned(0x45, (unsigned char *)iph);
331 iph->tos = 0;
332 put_unaligned(htons(ip_len), &(iph->tot_len));
333 iph->id = 0;
334 iph->frag_off = 0;
335 iph->ttl = 64;
336 iph->protocol = IPPROTO_UDP;
337 iph->check = 0;
338 put_unaligned(htonl(np->local_ip), &(iph->saddr));
339 put_unaligned(htonl(np->remote_ip), &(iph->daddr));
340 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
341
342 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
343
344 eth->h_proto = htons(ETH_P_IP);
345 memcpy(eth->h_source, np->local_mac, 6);
346 memcpy(eth->h_dest, np->remote_mac, 6);
347
348 skb->dev = np->dev;
349
350 netpoll_send_skb(np, skb);
351}
352
353static void arp_reply(struct sk_buff *skb)
354{
Jeff Moyer115c1d62005-06-22 22:05:31 -0700355 struct netpoll_info *npinfo = skb->dev->npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 struct arphdr *arp;
357 unsigned char *arp_ptr;
358 int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
359 u32 sip, tip;
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700360 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 struct sk_buff *send_skb;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700362 struct netpoll *np = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700364 if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
365 np = npinfo->rx_np;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700366 if (!np)
367 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 /* No arp on this interface */
370 if (skb->dev->flags & IFF_NOARP)
371 return;
372
373 if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
374 (2 * skb->dev->addr_len) +
375 (2 * sizeof(u32)))))
376 return;
377
378 skb->h.raw = skb->nh.raw = skb->data;
379 arp = skb->nh.arph;
380
381 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
382 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
383 arp->ar_pro != htons(ETH_P_IP) ||
384 arp->ar_op != htons(ARPOP_REQUEST))
385 return;
386
387 arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len;
388 memcpy(&sip, arp_ptr, 4);
389 arp_ptr += 4 + skb->dev->addr_len;
390 memcpy(&tip, arp_ptr, 4);
391
392 /* Should we ignore arp? */
393 if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip))
394 return;
395
396 size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4);
397 send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev),
398 LL_RESERVED_SPACE(np->dev));
399
400 if (!send_skb)
401 return;
402
403 send_skb->nh.raw = send_skb->data;
404 arp = (struct arphdr *) skb_put(send_skb, size);
405 send_skb->dev = skb->dev;
406 send_skb->protocol = htons(ETH_P_ARP);
407
408 /* Fill the device header for the ARP frame */
409
410 if (np->dev->hard_header &&
411 np->dev->hard_header(send_skb, skb->dev, ptype,
412 np->remote_mac, np->local_mac,
413 send_skb->len) < 0) {
414 kfree_skb(send_skb);
415 return;
416 }
417
418 /*
419 * Fill out the arp protocol part.
420 *
421 * we only support ethernet device type,
422 * which (according to RFC 1390) should always equal 1 (Ethernet).
423 */
424
425 arp->ar_hrd = htons(np->dev->type);
426 arp->ar_pro = htons(ETH_P_IP);
427 arp->ar_hln = np->dev->addr_len;
428 arp->ar_pln = 4;
429 arp->ar_op = htons(type);
430
431 arp_ptr=(unsigned char *)(arp + 1);
432 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
433 arp_ptr += np->dev->addr_len;
434 memcpy(arp_ptr, &tip, 4);
435 arp_ptr += 4;
436 memcpy(arp_ptr, np->remote_mac, np->dev->addr_len);
437 arp_ptr += np->dev->addr_len;
438 memcpy(arp_ptr, &sip, 4);
439
440 netpoll_send_skb(np, send_skb);
441}
442
443int __netpoll_rx(struct sk_buff *skb)
444{
445 int proto, len, ulen;
446 struct iphdr *iph;
447 struct udphdr *uh;
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700448 struct netpoll *np = skb->dev->npinfo->rx_np;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700450 if (!np)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 goto out;
452 if (skb->dev->type != ARPHRD_ETHER)
453 goto out;
454
455 /* check if netpoll clients need ARP */
456 if (skb->protocol == __constant_htons(ETH_P_ARP) &&
457 atomic_read(&trapped)) {
458 arp_reply(skb);
459 return 1;
460 }
461
462 proto = ntohs(eth_hdr(skb)->h_proto);
463 if (proto != ETH_P_IP)
464 goto out;
465 if (skb->pkt_type == PACKET_OTHERHOST)
466 goto out;
467 if (skb_shared(skb))
468 goto out;
469
470 iph = (struct iphdr *)skb->data;
471 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
472 goto out;
473 if (iph->ihl < 5 || iph->version != 4)
474 goto out;
475 if (!pskb_may_pull(skb, iph->ihl*4))
476 goto out;
477 if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
478 goto out;
479
480 len = ntohs(iph->tot_len);
481 if (skb->len < len || len < iph->ihl*4)
482 goto out;
483
484 if (iph->protocol != IPPROTO_UDP)
485 goto out;
486
487 len -= iph->ihl*4;
488 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
489 ulen = ntohs(uh->len);
490
491 if (ulen != len)
492 goto out;
493 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr) < 0)
494 goto out;
495 if (np->local_ip && np->local_ip != ntohl(iph->daddr))
496 goto out;
497 if (np->remote_ip && np->remote_ip != ntohl(iph->saddr))
498 goto out;
499 if (np->local_port && np->local_port != ntohs(uh->dest))
500 goto out;
501
502 np->rx_hook(np, ntohs(uh->source),
503 (char *)(uh+1),
504 ulen - sizeof(struct udphdr));
505
506 kfree_skb(skb);
507 return 1;
508
509out:
510 if (atomic_read(&trapped)) {
511 kfree_skb(skb);
512 return 1;
513 }
514
515 return 0;
516}
517
518int netpoll_parse_options(struct netpoll *np, char *opt)
519{
520 char *cur=opt, *delim;
521
522 if(*cur != '@') {
523 if ((delim = strchr(cur, '@')) == NULL)
524 goto parse_failed;
525 *delim=0;
526 np->local_port=simple_strtol(cur, NULL, 10);
527 cur=delim;
528 }
529 cur++;
530 printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port);
531
532 if(*cur != '/') {
533 if ((delim = strchr(cur, '/')) == NULL)
534 goto parse_failed;
535 *delim=0;
536 np->local_ip=ntohl(in_aton(cur));
537 cur=delim;
538
539 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
540 np->name, HIPQUAD(np->local_ip));
541 }
542 cur++;
543
544 if ( *cur != ',') {
545 /* parse out dev name */
546 if ((delim = strchr(cur, ',')) == NULL)
547 goto parse_failed;
548 *delim=0;
549 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
550 cur=delim;
551 }
552 cur++;
553
554 printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name);
555
556 if ( *cur != '@' ) {
557 /* dst port */
558 if ((delim = strchr(cur, '@')) == NULL)
559 goto parse_failed;
560 *delim=0;
561 np->remote_port=simple_strtol(cur, NULL, 10);
562 cur=delim;
563 }
564 cur++;
565 printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port);
566
567 /* dst ip */
568 if ((delim = strchr(cur, '/')) == NULL)
569 goto parse_failed;
570 *delim=0;
571 np->remote_ip=ntohl(in_aton(cur));
572 cur=delim+1;
573
574 printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
575 np->name, HIPQUAD(np->remote_ip));
576
577 if( *cur != 0 )
578 {
579 /* MAC address */
580 if ((delim = strchr(cur, ':')) == NULL)
581 goto parse_failed;
582 *delim=0;
583 np->remote_mac[0]=simple_strtol(cur, NULL, 16);
584 cur=delim+1;
585 if ((delim = strchr(cur, ':')) == NULL)
586 goto parse_failed;
587 *delim=0;
588 np->remote_mac[1]=simple_strtol(cur, NULL, 16);
589 cur=delim+1;
590 if ((delim = strchr(cur, ':')) == NULL)
591 goto parse_failed;
592 *delim=0;
593 np->remote_mac[2]=simple_strtol(cur, NULL, 16);
594 cur=delim+1;
595 if ((delim = strchr(cur, ':')) == NULL)
596 goto parse_failed;
597 *delim=0;
598 np->remote_mac[3]=simple_strtol(cur, NULL, 16);
599 cur=delim+1;
600 if ((delim = strchr(cur, ':')) == NULL)
601 goto parse_failed;
602 *delim=0;
603 np->remote_mac[4]=simple_strtol(cur, NULL, 16);
604 cur=delim+1;
605 np->remote_mac[5]=simple_strtol(cur, NULL, 16);
606 }
607
608 printk(KERN_INFO "%s: remote ethernet address "
609 "%02x:%02x:%02x:%02x:%02x:%02x\n",
610 np->name,
611 np->remote_mac[0],
612 np->remote_mac[1],
613 np->remote_mac[2],
614 np->remote_mac[3],
615 np->remote_mac[4],
616 np->remote_mac[5]);
617
618 return 0;
619
620 parse_failed:
621 printk(KERN_INFO "%s: couldn't parse config at %s!\n",
622 np->name, cur);
623 return -1;
624}
625
626int netpoll_setup(struct netpoll *np)
627{
628 struct net_device *ndev = NULL;
629 struct in_device *in_dev;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700630 struct netpoll_info *npinfo;
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700631 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 if (np->dev_name)
634 ndev = dev_get_by_name(np->dev_name);
635 if (!ndev) {
636 printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
637 np->name, np->dev_name);
638 return -1;
639 }
640
641 np->dev = ndev;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700642 if (!ndev->npinfo) {
643 npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
644 if (!npinfo)
645 goto release;
646
Jeff Moyer11513122005-08-11 19:23:04 -0700647 npinfo->rx_flags = 0;
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700648 npinfo->rx_np = NULL;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700649 npinfo->poll_lock = SPIN_LOCK_UNLOCKED;
650 npinfo->poll_owner = -1;
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700651 npinfo->tries = MAX_RETRIES;
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700652 npinfo->rx_lock = SPIN_LOCK_UNLOCKED;
Jeff Moyer115c1d62005-06-22 22:05:31 -0700653 } else
654 npinfo = ndev->npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656 if (!ndev->poll_controller) {
657 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
658 np->name, np->dev_name);
659 goto release;
660 }
661
662 if (!netif_running(ndev)) {
663 unsigned long atmost, atleast;
664
665 printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
666 np->name, np->dev_name);
667
668 rtnl_shlock();
669 if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
670 printk(KERN_ERR "%s: failed to open %s\n",
671 np->name, np->dev_name);
672 rtnl_shunlock();
673 goto release;
674 }
675 rtnl_shunlock();
676
677 atleast = jiffies + HZ/10;
678 atmost = jiffies + 4*HZ;
679 while (!netif_carrier_ok(ndev)) {
680 if (time_after(jiffies, atmost)) {
681 printk(KERN_NOTICE
682 "%s: timeout waiting for carrier\n",
683 np->name);
684 break;
685 }
686 cond_resched();
687 }
688
689 /* If carrier appears to come up instantly, we don't
690 * trust it and pause so that we don't pump all our
691 * queued console messages into the bitbucket.
692 */
693
694 if (time_before(jiffies, atleast)) {
695 printk(KERN_NOTICE "%s: carrier detect appears"
696 " untrustworthy, waiting 4 seconds\n",
697 np->name);
698 msleep(4000);
699 }
700 }
701
702 if (!memcmp(np->local_mac, "\0\0\0\0\0\0", 6) && ndev->dev_addr)
703 memcpy(np->local_mac, ndev->dev_addr, 6);
704
705 if (!np->local_ip) {
706 rcu_read_lock();
707 in_dev = __in_dev_get(ndev);
708
709 if (!in_dev || !in_dev->ifa_list) {
710 rcu_read_unlock();
711 printk(KERN_ERR "%s: no IP address for %s, aborting\n",
712 np->name, np->dev_name);
713 goto release;
714 }
715
716 np->local_ip = ntohl(in_dev->ifa_list->ifa_local);
717 rcu_read_unlock();
718 printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
719 np->name, HIPQUAD(np->local_ip));
720 }
721
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700722 if (np->rx_hook) {
723 spin_lock_irqsave(&npinfo->rx_lock, flags);
724 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
725 npinfo->rx_np = np;
726 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
727 }
Ingo Molnar26520762005-08-11 19:26:42 -0700728
729 /* fill up the skb queue */
730 refill_skbs();
731
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700732 /* last thing to do is link it to the net device structure */
Jeff Moyer115c1d62005-06-22 22:05:31 -0700733 ndev->npinfo = npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 return 0;
736
737 release:
Jeff Moyer115c1d62005-06-22 22:05:31 -0700738 if (!ndev->npinfo)
739 kfree(npinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 np->dev = NULL;
741 dev_put(ndev);
742 return -1;
743}
744
745void netpoll_cleanup(struct netpoll *np)
746{
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700747 struct netpoll_info *npinfo;
748 unsigned long flags;
749
Jeff Moyer115c1d62005-06-22 22:05:31 -0700750 if (np->dev) {
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700751 npinfo = np->dev->npinfo;
752 if (npinfo && npinfo->rx_np == np) {
753 spin_lock_irqsave(&npinfo->rx_lock, flags);
754 npinfo->rx_np = NULL;
755 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
756 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
757 }
Jeff Moyer115c1d62005-06-22 22:05:31 -0700758 dev_put(np->dev);
759 }
Jeff Moyerfbeec2e2005-06-22 22:05:59 -0700760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 np->dev = NULL;
762}
763
764int netpoll_trap(void)
765{
766 return atomic_read(&trapped);
767}
768
769void netpoll_set_trap(int trap)
770{
771 if (trap)
772 atomic_inc(&trapped);
773 else
774 atomic_dec(&trapped);
775}
776
777EXPORT_SYMBOL(netpoll_set_trap);
778EXPORT_SYMBOL(netpoll_trap);
779EXPORT_SYMBOL(netpoll_parse_options);
780EXPORT_SYMBOL(netpoll_setup);
781EXPORT_SYMBOL(netpoll_cleanup);
782EXPORT_SYMBOL(netpoll_send_udp);
783EXPORT_SYMBOL(netpoll_poll);
784EXPORT_SYMBOL(netpoll_queue);