Commit | Line | Data |
---|---|---|
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> | |
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 DEFINE_SPINLOCK(skb_list_lock); | |
38 | static int nr_skbs; | |
39 | static struct sk_buff *skbs; | |
40 | ||
41 | static DEFINE_SPINLOCK(queue_lock); | |
42 | static int queue_depth; | |
43 | static struct sk_buff *queue_head, *queue_tail; | |
44 | ||
45 | static atomic_t trapped; | |
46 | ||
47 | #define NETPOLL_RX_ENABLED 1 | |
48 | #define NETPOLL_RX_DROP 2 | |
49 | ||
50 | #define MAX_SKB_SIZE \ | |
51 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
52 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
53 | ||
54 | static void zap_completion_queue(void); | |
55 | ||
56 | static void queue_process(void *p) | |
57 | { | |
58 | unsigned long flags; | |
59 | struct sk_buff *skb; | |
60 | ||
61 | while (queue_head) { | |
62 | spin_lock_irqsave(&queue_lock, flags); | |
63 | ||
64 | skb = queue_head; | |
65 | queue_head = skb->next; | |
66 | if (skb == queue_tail) | |
67 | queue_head = NULL; | |
68 | ||
69 | queue_depth--; | |
70 | ||
71 | spin_unlock_irqrestore(&queue_lock, flags); | |
72 | ||
73 | dev_queue_xmit(skb); | |
74 | } | |
75 | } | |
76 | ||
77 | static DECLARE_WORK(send_queue, queue_process, NULL); | |
78 | ||
79 | void netpoll_queue(struct sk_buff *skb) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
83 | if (queue_depth == MAX_QUEUE_DEPTH) { | |
84 | __kfree_skb(skb); | |
85 | return; | |
86 | } | |
87 | ||
88 | spin_lock_irqsave(&queue_lock, flags); | |
89 | if (!queue_head) | |
90 | queue_head = skb; | |
91 | else | |
92 | queue_tail->next = skb; | |
93 | queue_tail = skb; | |
94 | queue_depth++; | |
95 | spin_unlock_irqrestore(&queue_lock, flags); | |
96 | ||
97 | schedule_work(&send_queue); | |
98 | } | |
99 | ||
100 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, | |
101 | unsigned short ulen, u32 saddr, u32 daddr) | |
102 | { | |
103 | if (uh->check == 0) | |
104 | return 0; | |
105 | ||
106 | if (skb->ip_summed == CHECKSUM_HW) | |
107 | return csum_tcpudp_magic( | |
108 | saddr, daddr, ulen, IPPROTO_UDP, skb->csum); | |
109 | ||
110 | skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); | |
111 | ||
112 | return csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Check whether delayed processing was scheduled for our NIC. If so, | |
117 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
118 | * If this fails, either we've recursed in ->poll() or it's already | |
119 | * running on another CPU. | |
120 | * | |
121 | * Note: we don't mask interrupts with this lock because we're using | |
122 | * trylock here and interrupts are already disabled in the softirq | |
123 | * case. Further, we test the poll_owner to avoid recursion on UP | |
124 | * systems where the lock doesn't exist. | |
125 | * | |
126 | * In cases where there is bi-directional communications, reading only | |
127 | * one message at a time can lead to packets being dropped by the | |
128 | * network adapter, forcing superfluous retries and possibly timeouts. | |
129 | * Thus, we set our budget to greater than 1. | |
130 | */ | |
131 | static void poll_napi(struct netpoll *np) | |
132 | { | |
133 | int budget = 16; | |
134 | ||
135 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
136 | np->poll_owner != smp_processor_id() && | |
137 | spin_trylock(&np->poll_lock)) { | |
138 | np->rx_flags |= NETPOLL_RX_DROP; | |
139 | atomic_inc(&trapped); | |
140 | ||
141 | np->dev->poll(np->dev, &budget); | |
142 | ||
143 | atomic_dec(&trapped); | |
144 | np->rx_flags &= ~NETPOLL_RX_DROP; | |
145 | spin_unlock(&np->poll_lock); | |
146 | } | |
147 | } | |
148 | ||
149 | void netpoll_poll(struct netpoll *np) | |
150 | { | |
151 | if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) | |
152 | return; | |
153 | ||
154 | /* Process pending work on NIC */ | |
155 | np->dev->poll_controller(np->dev); | |
156 | if (np->dev->poll) | |
157 | poll_napi(np); | |
158 | ||
159 | zap_completion_queue(); | |
160 | } | |
161 | ||
162 | static void refill_skbs(void) | |
163 | { | |
164 | struct sk_buff *skb; | |
165 | unsigned long flags; | |
166 | ||
167 | spin_lock_irqsave(&skb_list_lock, flags); | |
168 | while (nr_skbs < MAX_SKBS) { | |
169 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); | |
170 | if (!skb) | |
171 | break; | |
172 | ||
173 | skb->next = skbs; | |
174 | skbs = skb; | |
175 | nr_skbs++; | |
176 | } | |
177 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
178 | } | |
179 | ||
180 | static void zap_completion_queue(void) | |
181 | { | |
182 | unsigned long flags; | |
183 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
184 | ||
185 | if (sd->completion_queue) { | |
186 | struct sk_buff *clist; | |
187 | ||
188 | local_irq_save(flags); | |
189 | clist = sd->completion_queue; | |
190 | sd->completion_queue = NULL; | |
191 | local_irq_restore(flags); | |
192 | ||
193 | while (clist != NULL) { | |
194 | struct sk_buff *skb = clist; | |
195 | clist = clist->next; | |
196 | if(skb->destructor) | |
197 | dev_kfree_skb_any(skb); /* put this one back */ | |
198 | else | |
199 | __kfree_skb(skb); | |
200 | } | |
201 | } | |
202 | ||
203 | put_cpu_var(softnet_data); | |
204 | } | |
205 | ||
206 | static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve) | |
207 | { | |
208 | int once = 1, count = 0; | |
209 | unsigned long flags; | |
210 | struct sk_buff *skb = NULL; | |
211 | ||
212 | zap_completion_queue(); | |
213 | repeat: | |
214 | if (nr_skbs < MAX_SKBS) | |
215 | refill_skbs(); | |
216 | ||
217 | skb = alloc_skb(len, GFP_ATOMIC); | |
218 | ||
219 | if (!skb) { | |
220 | spin_lock_irqsave(&skb_list_lock, flags); | |
221 | skb = skbs; | |
222 | if (skb) { | |
223 | skbs = skb->next; | |
224 | skb->next = NULL; | |
225 | nr_skbs--; | |
226 | } | |
227 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
228 | } | |
229 | ||
230 | if(!skb) { | |
231 | count++; | |
232 | if (once && (count == 1000000)) { | |
233 | printk("out of netpoll skbs!\n"); | |
234 | once = 0; | |
235 | } | |
236 | netpoll_poll(np); | |
237 | goto repeat; | |
238 | } | |
239 | ||
240 | atomic_set(&skb->users, 1); | |
241 | skb_reserve(skb, reserve); | |
242 | return skb; | |
243 | } | |
244 | ||
245 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
246 | { | |
247 | int status; | |
248 | ||
249 | repeat: | |
250 | if(!np || !np->dev || !netif_running(np->dev)) { | |
251 | __kfree_skb(skb); | |
252 | return; | |
253 | } | |
254 | ||
255 | /* avoid recursion */ | |
256 | if(np->poll_owner == smp_processor_id() || | |
257 | np->dev->xmit_lock_owner == smp_processor_id()) { | |
258 | if (np->drop) | |
259 | np->drop(skb); | |
260 | else | |
261 | __kfree_skb(skb); | |
262 | return; | |
263 | } | |
264 | ||
265 | spin_lock(&np->dev->xmit_lock); | |
266 | np->dev->xmit_lock_owner = smp_processor_id(); | |
267 | ||
268 | /* | |
269 | * network drivers do not expect to be called if the queue is | |
270 | * stopped. | |
271 | */ | |
272 | if (netif_queue_stopped(np->dev)) { | |
273 | np->dev->xmit_lock_owner = -1; | |
274 | spin_unlock(&np->dev->xmit_lock); | |
275 | ||
276 | netpoll_poll(np); | |
277 | goto repeat; | |
278 | } | |
279 | ||
280 | status = np->dev->hard_start_xmit(skb, np->dev); | |
281 | np->dev->xmit_lock_owner = -1; | |
282 | spin_unlock(&np->dev->xmit_lock); | |
283 | ||
284 | /* transmit busy */ | |
285 | if(status) { | |
286 | netpoll_poll(np); | |
287 | goto repeat; | |
288 | } | |
289 | } | |
290 | ||
291 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
292 | { | |
293 | int total_len, eth_len, ip_len, udp_len; | |
294 | struct sk_buff *skb; | |
295 | struct udphdr *udph; | |
296 | struct iphdr *iph; | |
297 | struct ethhdr *eth; | |
298 | ||
299 | udp_len = len + sizeof(*udph); | |
300 | ip_len = eth_len = udp_len + sizeof(*iph); | |
301 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
302 | ||
303 | skb = find_skb(np, total_len, total_len - len); | |
304 | if (!skb) | |
305 | return; | |
306 | ||
307 | memcpy(skb->data, msg, len); | |
308 | skb->len += len; | |
309 | ||
310 | udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); | |
311 | udph->source = htons(np->local_port); | |
312 | udph->dest = htons(np->remote_port); | |
313 | udph->len = htons(udp_len); | |
314 | udph->check = 0; | |
315 | ||
316 | iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); | |
317 | ||
318 | /* iph->version = 4; iph->ihl = 5; */ | |
319 | put_unaligned(0x45, (unsigned char *)iph); | |
320 | iph->tos = 0; | |
321 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
322 | iph->id = 0; | |
323 | iph->frag_off = 0; | |
324 | iph->ttl = 64; | |
325 | iph->protocol = IPPROTO_UDP; | |
326 | iph->check = 0; | |
327 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
328 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
329 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
330 | ||
331 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
332 | ||
333 | eth->h_proto = htons(ETH_P_IP); | |
334 | memcpy(eth->h_source, np->local_mac, 6); | |
335 | memcpy(eth->h_dest, np->remote_mac, 6); | |
336 | ||
337 | skb->dev = np->dev; | |
338 | ||
339 | netpoll_send_skb(np, skb); | |
340 | } | |
341 | ||
342 | static void arp_reply(struct sk_buff *skb) | |
343 | { | |
344 | struct arphdr *arp; | |
345 | unsigned char *arp_ptr; | |
346 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
347 | u32 sip, tip; | |
348 | struct sk_buff *send_skb; | |
349 | struct netpoll *np = skb->dev->np; | |
350 | ||
351 | if (!np) return; | |
352 | ||
353 | /* No arp on this interface */ | |
354 | if (skb->dev->flags & IFF_NOARP) | |
355 | return; | |
356 | ||
357 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
358 | (2 * skb->dev->addr_len) + | |
359 | (2 * sizeof(u32))))) | |
360 | return; | |
361 | ||
362 | skb->h.raw = skb->nh.raw = skb->data; | |
363 | arp = skb->nh.arph; | |
364 | ||
365 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
366 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
367 | arp->ar_pro != htons(ETH_P_IP) || | |
368 | arp->ar_op != htons(ARPOP_REQUEST)) | |
369 | return; | |
370 | ||
371 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
372 | memcpy(&sip, arp_ptr, 4); | |
373 | arp_ptr += 4 + skb->dev->addr_len; | |
374 | memcpy(&tip, arp_ptr, 4); | |
375 | ||
376 | /* Should we ignore arp? */ | |
377 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
378 | return; | |
379 | ||
380 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
381 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
382 | LL_RESERVED_SPACE(np->dev)); | |
383 | ||
384 | if (!send_skb) | |
385 | return; | |
386 | ||
387 | send_skb->nh.raw = send_skb->data; | |
388 | arp = (struct arphdr *) skb_put(send_skb, size); | |
389 | send_skb->dev = skb->dev; | |
390 | send_skb->protocol = htons(ETH_P_ARP); | |
391 | ||
392 | /* Fill the device header for the ARP frame */ | |
393 | ||
394 | if (np->dev->hard_header && | |
395 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
396 | np->remote_mac, np->local_mac, | |
397 | send_skb->len) < 0) { | |
398 | kfree_skb(send_skb); | |
399 | return; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Fill out the arp protocol part. | |
404 | * | |
405 | * we only support ethernet device type, | |
406 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
407 | */ | |
408 | ||
409 | arp->ar_hrd = htons(np->dev->type); | |
410 | arp->ar_pro = htons(ETH_P_IP); | |
411 | arp->ar_hln = np->dev->addr_len; | |
412 | arp->ar_pln = 4; | |
413 | arp->ar_op = htons(type); | |
414 | ||
415 | arp_ptr=(unsigned char *)(arp + 1); | |
416 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
417 | arp_ptr += np->dev->addr_len; | |
418 | memcpy(arp_ptr, &tip, 4); | |
419 | arp_ptr += 4; | |
420 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
421 | arp_ptr += np->dev->addr_len; | |
422 | memcpy(arp_ptr, &sip, 4); | |
423 | ||
424 | netpoll_send_skb(np, send_skb); | |
425 | } | |
426 | ||
427 | int __netpoll_rx(struct sk_buff *skb) | |
428 | { | |
429 | int proto, len, ulen; | |
430 | struct iphdr *iph; | |
431 | struct udphdr *uh; | |
432 | struct netpoll *np = skb->dev->np; | |
433 | ||
434 | if (!np->rx_hook) | |
435 | goto out; | |
436 | if (skb->dev->type != ARPHRD_ETHER) | |
437 | goto out; | |
438 | ||
439 | /* check if netpoll clients need ARP */ | |
440 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
441 | atomic_read(&trapped)) { | |
442 | arp_reply(skb); | |
443 | return 1; | |
444 | } | |
445 | ||
446 | proto = ntohs(eth_hdr(skb)->h_proto); | |
447 | if (proto != ETH_P_IP) | |
448 | goto out; | |
449 | if (skb->pkt_type == PACKET_OTHERHOST) | |
450 | goto out; | |
451 | if (skb_shared(skb)) | |
452 | goto out; | |
453 | ||
454 | iph = (struct iphdr *)skb->data; | |
455 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
456 | goto out; | |
457 | if (iph->ihl < 5 || iph->version != 4) | |
458 | goto out; | |
459 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
460 | goto out; | |
461 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
462 | goto out; | |
463 | ||
464 | len = ntohs(iph->tot_len); | |
465 | if (skb->len < len || len < iph->ihl*4) | |
466 | goto out; | |
467 | ||
468 | if (iph->protocol != IPPROTO_UDP) | |
469 | goto out; | |
470 | ||
471 | len -= iph->ihl*4; | |
472 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
473 | ulen = ntohs(uh->len); | |
474 | ||
475 | if (ulen != len) | |
476 | goto out; | |
477 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr) < 0) | |
478 | goto out; | |
479 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
480 | goto out; | |
481 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
482 | goto out; | |
483 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
484 | goto out; | |
485 | ||
486 | np->rx_hook(np, ntohs(uh->source), | |
487 | (char *)(uh+1), | |
488 | ulen - sizeof(struct udphdr)); | |
489 | ||
490 | kfree_skb(skb); | |
491 | return 1; | |
492 | ||
493 | out: | |
494 | if (atomic_read(&trapped)) { | |
495 | kfree_skb(skb); | |
496 | return 1; | |
497 | } | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
503 | { | |
504 | char *cur=opt, *delim; | |
505 | ||
506 | if(*cur != '@') { | |
507 | if ((delim = strchr(cur, '@')) == NULL) | |
508 | goto parse_failed; | |
509 | *delim=0; | |
510 | np->local_port=simple_strtol(cur, NULL, 10); | |
511 | cur=delim; | |
512 | } | |
513 | cur++; | |
514 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
515 | ||
516 | if(*cur != '/') { | |
517 | if ((delim = strchr(cur, '/')) == NULL) | |
518 | goto parse_failed; | |
519 | *delim=0; | |
520 | np->local_ip=ntohl(in_aton(cur)); | |
521 | cur=delim; | |
522 | ||
523 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
524 | np->name, HIPQUAD(np->local_ip)); | |
525 | } | |
526 | cur++; | |
527 | ||
528 | if ( *cur != ',') { | |
529 | /* parse out dev name */ | |
530 | if ((delim = strchr(cur, ',')) == NULL) | |
531 | goto parse_failed; | |
532 | *delim=0; | |
533 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); | |
534 | cur=delim; | |
535 | } | |
536 | cur++; | |
537 | ||
538 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
539 | ||
540 | if ( *cur != '@' ) { | |
541 | /* dst port */ | |
542 | if ((delim = strchr(cur, '@')) == NULL) | |
543 | goto parse_failed; | |
544 | *delim=0; | |
545 | np->remote_port=simple_strtol(cur, NULL, 10); | |
546 | cur=delim; | |
547 | } | |
548 | cur++; | |
549 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
550 | ||
551 | /* dst ip */ | |
552 | if ((delim = strchr(cur, '/')) == NULL) | |
553 | goto parse_failed; | |
554 | *delim=0; | |
555 | np->remote_ip=ntohl(in_aton(cur)); | |
556 | cur=delim+1; | |
557 | ||
558 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
559 | np->name, HIPQUAD(np->remote_ip)); | |
560 | ||
561 | if( *cur != 0 ) | |
562 | { | |
563 | /* MAC address */ | |
564 | if ((delim = strchr(cur, ':')) == NULL) | |
565 | goto parse_failed; | |
566 | *delim=0; | |
567 | np->remote_mac[0]=simple_strtol(cur, NULL, 16); | |
568 | cur=delim+1; | |
569 | if ((delim = strchr(cur, ':')) == NULL) | |
570 | goto parse_failed; | |
571 | *delim=0; | |
572 | np->remote_mac[1]=simple_strtol(cur, NULL, 16); | |
573 | cur=delim+1; | |
574 | if ((delim = strchr(cur, ':')) == NULL) | |
575 | goto parse_failed; | |
576 | *delim=0; | |
577 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); | |
578 | cur=delim+1; | |
579 | if ((delim = strchr(cur, ':')) == NULL) | |
580 | goto parse_failed; | |
581 | *delim=0; | |
582 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); | |
583 | cur=delim+1; | |
584 | if ((delim = strchr(cur, ':')) == NULL) | |
585 | goto parse_failed; | |
586 | *delim=0; | |
587 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); | |
588 | cur=delim+1; | |
589 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); | |
590 | } | |
591 | ||
592 | printk(KERN_INFO "%s: remote ethernet address " | |
593 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
594 | np->name, | |
595 | np->remote_mac[0], | |
596 | np->remote_mac[1], | |
597 | np->remote_mac[2], | |
598 | np->remote_mac[3], | |
599 | np->remote_mac[4], | |
600 | np->remote_mac[5]); | |
601 | ||
602 | return 0; | |
603 | ||
604 | parse_failed: | |
605 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
606 | np->name, cur); | |
607 | return -1; | |
608 | } | |
609 | ||
610 | int netpoll_setup(struct netpoll *np) | |
611 | { | |
612 | struct net_device *ndev = NULL; | |
613 | struct in_device *in_dev; | |
614 | ||
615 | np->poll_lock = SPIN_LOCK_UNLOCKED; | |
616 | np->poll_owner = -1; | |
617 | ||
618 | if (np->dev_name) | |
619 | ndev = dev_get_by_name(np->dev_name); | |
620 | if (!ndev) { | |
621 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
622 | np->name, np->dev_name); | |
623 | return -1; | |
624 | } | |
625 | ||
626 | np->dev = ndev; | |
627 | ndev->np = np; | |
628 | ||
629 | if (!ndev->poll_controller) { | |
630 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
631 | np->name, np->dev_name); | |
632 | goto release; | |
633 | } | |
634 | ||
635 | if (!netif_running(ndev)) { | |
636 | unsigned long atmost, atleast; | |
637 | ||
638 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
639 | np->name, np->dev_name); | |
640 | ||
641 | rtnl_shlock(); | |
642 | if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) { | |
643 | printk(KERN_ERR "%s: failed to open %s\n", | |
644 | np->name, np->dev_name); | |
645 | rtnl_shunlock(); | |
646 | goto release; | |
647 | } | |
648 | rtnl_shunlock(); | |
649 | ||
650 | atleast = jiffies + HZ/10; | |
651 | atmost = jiffies + 4*HZ; | |
652 | while (!netif_carrier_ok(ndev)) { | |
653 | if (time_after(jiffies, atmost)) { | |
654 | printk(KERN_NOTICE | |
655 | "%s: timeout waiting for carrier\n", | |
656 | np->name); | |
657 | break; | |
658 | } | |
659 | cond_resched(); | |
660 | } | |
661 | ||
662 | /* If carrier appears to come up instantly, we don't | |
663 | * trust it and pause so that we don't pump all our | |
664 | * queued console messages into the bitbucket. | |
665 | */ | |
666 | ||
667 | if (time_before(jiffies, atleast)) { | |
668 | printk(KERN_NOTICE "%s: carrier detect appears" | |
669 | " untrustworthy, waiting 4 seconds\n", | |
670 | np->name); | |
671 | msleep(4000); | |
672 | } | |
673 | } | |
674 | ||
675 | if (!memcmp(np->local_mac, "\0\0\0\0\0\0", 6) && ndev->dev_addr) | |
676 | memcpy(np->local_mac, ndev->dev_addr, 6); | |
677 | ||
678 | if (!np->local_ip) { | |
679 | rcu_read_lock(); | |
680 | in_dev = __in_dev_get(ndev); | |
681 | ||
682 | if (!in_dev || !in_dev->ifa_list) { | |
683 | rcu_read_unlock(); | |
684 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
685 | np->name, np->dev_name); | |
686 | goto release; | |
687 | } | |
688 | ||
689 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
690 | rcu_read_unlock(); | |
691 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
692 | np->name, HIPQUAD(np->local_ip)); | |
693 | } | |
694 | ||
695 | if(np->rx_hook) | |
696 | np->rx_flags = NETPOLL_RX_ENABLED; | |
697 | ||
698 | return 0; | |
699 | ||
700 | release: | |
701 | ndev->np = NULL; | |
702 | np->dev = NULL; | |
703 | dev_put(ndev); | |
704 | return -1; | |
705 | } | |
706 | ||
707 | void netpoll_cleanup(struct netpoll *np) | |
708 | { | |
709 | if (np->dev) | |
710 | np->dev->np = NULL; | |
711 | dev_put(np->dev); | |
712 | np->dev = NULL; | |
713 | } | |
714 | ||
715 | int netpoll_trap(void) | |
716 | { | |
717 | return atomic_read(&trapped); | |
718 | } | |
719 | ||
720 | void netpoll_set_trap(int trap) | |
721 | { | |
722 | if (trap) | |
723 | atomic_inc(&trapped); | |
724 | else | |
725 | atomic_dec(&trapped); | |
726 | } | |
727 | ||
728 | EXPORT_SYMBOL(netpoll_set_trap); | |
729 | EXPORT_SYMBOL(netpoll_trap); | |
730 | EXPORT_SYMBOL(netpoll_parse_options); | |
731 | EXPORT_SYMBOL(netpoll_setup); | |
732 | EXPORT_SYMBOL(netpoll_cleanup); | |
733 | EXPORT_SYMBOL(netpoll_send_udp); | |
734 | EXPORT_SYMBOL(netpoll_poll); | |
735 | EXPORT_SYMBOL(netpoll_queue); |