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Commit | Line | Data |
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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) | |
0db1d6fc | 36 | #define MAX_RETRIES 20000 |
1da177e4 LT |
37 | |
38 | static DEFINE_SPINLOCK(skb_list_lock); | |
39 | static int nr_skbs; | |
40 | static struct sk_buff *skbs; | |
41 | ||
42 | static DEFINE_SPINLOCK(queue_lock); | |
43 | static int queue_depth; | |
44 | static struct sk_buff *queue_head, *queue_tail; | |
45 | ||
46 | static 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 | ||
55 | static void zap_completion_queue(void); | |
56 | ||
57 | static 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 | ||
78 | static DECLARE_WORK(send_queue, queue_process, NULL); | |
79 | ||
80 | void 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 | ||
101 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, | |
102 | unsigned short ulen, u32 saddr, u32 daddr) | |
103 | { | |
fb286bb2 HX |
104 | unsigned int psum; |
105 | ||
106 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
107 | return 0; |
108 | ||
fb286bb2 HX |
109 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
110 | ||
111 | if (skb->ip_summed == CHECKSUM_HW && | |
112 | !(u16)csum_fold(csum_add(psum, skb->csum))) | |
113 | return 0; | |
1da177e4 | 114 | |
fb286bb2 | 115 | skb->csum = psum; |
1da177e4 | 116 | |
fb286bb2 | 117 | return __skb_checksum_complete(skb); |
1da177e4 LT |
118 | } |
119 | ||
120 | /* | |
121 | * Check whether delayed processing was scheduled for our NIC. If so, | |
122 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
123 | * If this fails, either we've recursed in ->poll() or it's already | |
124 | * running on another CPU. | |
125 | * | |
126 | * Note: we don't mask interrupts with this lock because we're using | |
127 | * trylock here and interrupts are already disabled in the softirq | |
128 | * case. Further, we test the poll_owner to avoid recursion on UP | |
129 | * systems where the lock doesn't exist. | |
130 | * | |
131 | * In cases where there is bi-directional communications, reading only | |
132 | * one message at a time can lead to packets being dropped by the | |
133 | * network adapter, forcing superfluous retries and possibly timeouts. | |
134 | * Thus, we set our budget to greater than 1. | |
135 | */ | |
136 | static void poll_napi(struct netpoll *np) | |
137 | { | |
115c1d6e | 138 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
139 | int budget = 16; |
140 | ||
141 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
142 | npinfo->poll_owner != smp_processor_id() && |
143 | spin_trylock(&npinfo->poll_lock)) { | |
144 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
145 | atomic_inc(&trapped); |
146 | ||
147 | np->dev->poll(np->dev, &budget); | |
148 | ||
149 | atomic_dec(&trapped); | |
115c1d6e JM |
150 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
151 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
152 | } |
153 | } | |
154 | ||
155 | void netpoll_poll(struct netpoll *np) | |
156 | { | |
157 | if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) | |
158 | return; | |
159 | ||
160 | /* Process pending work on NIC */ | |
161 | np->dev->poll_controller(np->dev); | |
162 | if (np->dev->poll) | |
163 | poll_napi(np); | |
164 | ||
165 | zap_completion_queue(); | |
166 | } | |
167 | ||
168 | static void refill_skbs(void) | |
169 | { | |
170 | struct sk_buff *skb; | |
171 | unsigned long flags; | |
172 | ||
173 | spin_lock_irqsave(&skb_list_lock, flags); | |
174 | while (nr_skbs < MAX_SKBS) { | |
175 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); | |
176 | if (!skb) | |
177 | break; | |
178 | ||
179 | skb->next = skbs; | |
180 | skbs = skb; | |
181 | nr_skbs++; | |
182 | } | |
183 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
184 | } | |
185 | ||
186 | static void zap_completion_queue(void) | |
187 | { | |
188 | unsigned long flags; | |
189 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
190 | ||
191 | if (sd->completion_queue) { | |
192 | struct sk_buff *clist; | |
193 | ||
194 | local_irq_save(flags); | |
195 | clist = sd->completion_queue; | |
196 | sd->completion_queue = NULL; | |
197 | local_irq_restore(flags); | |
198 | ||
199 | while (clist != NULL) { | |
200 | struct sk_buff *skb = clist; | |
201 | clist = clist->next; | |
202 | if(skb->destructor) | |
203 | dev_kfree_skb_any(skb); /* put this one back */ | |
204 | else | |
205 | __kfree_skb(skb); | |
206 | } | |
207 | } | |
208 | ||
209 | put_cpu_var(softnet_data); | |
210 | } | |
211 | ||
212 | static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve) | |
213 | { | |
214 | int once = 1, count = 0; | |
215 | unsigned long flags; | |
216 | struct sk_buff *skb = NULL; | |
217 | ||
218 | zap_completion_queue(); | |
219 | repeat: | |
220 | if (nr_skbs < MAX_SKBS) | |
221 | refill_skbs(); | |
222 | ||
223 | skb = alloc_skb(len, GFP_ATOMIC); | |
224 | ||
225 | if (!skb) { | |
226 | spin_lock_irqsave(&skb_list_lock, flags); | |
227 | skb = skbs; | |
228 | if (skb) { | |
229 | skbs = skb->next; | |
230 | skb->next = NULL; | |
231 | nr_skbs--; | |
232 | } | |
233 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
234 | } | |
235 | ||
236 | if(!skb) { | |
237 | count++; | |
238 | if (once && (count == 1000000)) { | |
239 | printk("out of netpoll skbs!\n"); | |
240 | once = 0; | |
241 | } | |
242 | netpoll_poll(np); | |
243 | goto repeat; | |
244 | } | |
245 | ||
246 | atomic_set(&skb->users, 1); | |
247 | skb_reserve(skb, reserve); | |
248 | return skb; | |
249 | } | |
250 | ||
251 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
252 | { | |
253 | int status; | |
115c1d6e | 254 | struct netpoll_info *npinfo; |
1da177e4 | 255 | |
f0d3459d | 256 | if (!np || !np->dev || !netif_running(np->dev)) { |
1da177e4 LT |
257 | __kfree_skb(skb); |
258 | return; | |
259 | } | |
260 | ||
115c1d6e | 261 | npinfo = np->dev->npinfo; |
f0d3459d MM |
262 | |
263 | /* avoid recursion */ | |
115c1d6e JM |
264 | if (npinfo->poll_owner == smp_processor_id() || |
265 | np->dev->xmit_lock_owner == smp_processor_id()) { | |
1da177e4 LT |
266 | if (np->drop) |
267 | np->drop(skb); | |
268 | else | |
269 | __kfree_skb(skb); | |
270 | return; | |
271 | } | |
272 | ||
0db1d6fc MM |
273 | do { |
274 | npinfo->tries--; | |
f0d3459d MM |
275 | spin_lock(&np->dev->xmit_lock); |
276 | np->dev->xmit_lock_owner = smp_processor_id(); | |
277 | ||
278 | /* | |
279 | * network drivers do not expect to be called if the queue is | |
280 | * stopped. | |
281 | */ | |
282 | if (netif_queue_stopped(np->dev)) { | |
283 | np->dev->xmit_lock_owner = -1; | |
284 | spin_unlock(&np->dev->xmit_lock); | |
285 | netpoll_poll(np); | |
0db1d6fc | 286 | udelay(50); |
f0d3459d MM |
287 | continue; |
288 | } | |
1da177e4 | 289 | |
f0d3459d | 290 | status = np->dev->hard_start_xmit(skb, np->dev); |
1da177e4 LT |
291 | np->dev->xmit_lock_owner = -1; |
292 | spin_unlock(&np->dev->xmit_lock); | |
293 | ||
f0d3459d | 294 | /* success */ |
0db1d6fc MM |
295 | if(!status) { |
296 | npinfo->tries = MAX_RETRIES; /* reset */ | |
f0d3459d | 297 | return; |
0db1d6fc | 298 | } |
1da177e4 | 299 | |
f0d3459d | 300 | /* transmit busy */ |
1da177e4 | 301 | netpoll_poll(np); |
0db1d6fc MM |
302 | udelay(50); |
303 | } while (npinfo->tries > 0); | |
1da177e4 LT |
304 | } |
305 | ||
306 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
307 | { | |
308 | int total_len, eth_len, ip_len, udp_len; | |
309 | struct sk_buff *skb; | |
310 | struct udphdr *udph; | |
311 | struct iphdr *iph; | |
312 | struct ethhdr *eth; | |
313 | ||
314 | udp_len = len + sizeof(*udph); | |
315 | ip_len = eth_len = udp_len + sizeof(*iph); | |
316 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
317 | ||
318 | skb = find_skb(np, total_len, total_len - len); | |
319 | if (!skb) | |
320 | return; | |
321 | ||
322 | memcpy(skb->data, msg, len); | |
323 | skb->len += len; | |
324 | ||
325 | udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); | |
326 | udph->source = htons(np->local_port); | |
327 | udph->dest = htons(np->remote_port); | |
328 | udph->len = htons(udp_len); | |
329 | udph->check = 0; | |
330 | ||
331 | iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); | |
332 | ||
333 | /* iph->version = 4; iph->ihl = 5; */ | |
334 | put_unaligned(0x45, (unsigned char *)iph); | |
335 | iph->tos = 0; | |
336 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
337 | iph->id = 0; | |
338 | iph->frag_off = 0; | |
339 | iph->ttl = 64; | |
340 | iph->protocol = IPPROTO_UDP; | |
341 | iph->check = 0; | |
342 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
343 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
344 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
345 | ||
346 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
347 | ||
348 | eth->h_proto = htons(ETH_P_IP); | |
349 | memcpy(eth->h_source, np->local_mac, 6); | |
350 | memcpy(eth->h_dest, np->remote_mac, 6); | |
351 | ||
352 | skb->dev = np->dev; | |
353 | ||
354 | netpoll_send_skb(np, skb); | |
355 | } | |
356 | ||
357 | static void arp_reply(struct sk_buff *skb) | |
358 | { | |
115c1d6e | 359 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
360 | struct arphdr *arp; |
361 | unsigned char *arp_ptr; | |
362 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
363 | u32 sip, tip; | |
364 | struct sk_buff *send_skb; | |
115c1d6e | 365 | struct netpoll *np = NULL; |
1da177e4 | 366 | |
fbeec2e1 JM |
367 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
368 | np = npinfo->rx_np; | |
115c1d6e JM |
369 | if (!np) |
370 | return; | |
1da177e4 LT |
371 | |
372 | /* No arp on this interface */ | |
373 | if (skb->dev->flags & IFF_NOARP) | |
374 | return; | |
375 | ||
376 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
377 | (2 * skb->dev->addr_len) + | |
378 | (2 * sizeof(u32))))) | |
379 | return; | |
380 | ||
381 | skb->h.raw = skb->nh.raw = skb->data; | |
382 | arp = skb->nh.arph; | |
383 | ||
384 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
385 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
386 | arp->ar_pro != htons(ETH_P_IP) || | |
387 | arp->ar_op != htons(ARPOP_REQUEST)) | |
388 | return; | |
389 | ||
390 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
391 | memcpy(&sip, arp_ptr, 4); | |
392 | arp_ptr += 4 + skb->dev->addr_len; | |
393 | memcpy(&tip, arp_ptr, 4); | |
394 | ||
395 | /* Should we ignore arp? */ | |
396 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
397 | return; | |
398 | ||
399 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
400 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
401 | LL_RESERVED_SPACE(np->dev)); | |
402 | ||
403 | if (!send_skb) | |
404 | return; | |
405 | ||
406 | send_skb->nh.raw = send_skb->data; | |
407 | arp = (struct arphdr *) skb_put(send_skb, size); | |
408 | send_skb->dev = skb->dev; | |
409 | send_skb->protocol = htons(ETH_P_ARP); | |
410 | ||
411 | /* Fill the device header for the ARP frame */ | |
412 | ||
413 | if (np->dev->hard_header && | |
414 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
415 | np->remote_mac, np->local_mac, | |
416 | send_skb->len) < 0) { | |
417 | kfree_skb(send_skb); | |
418 | return; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Fill out the arp protocol part. | |
423 | * | |
424 | * we only support ethernet device type, | |
425 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
426 | */ | |
427 | ||
428 | arp->ar_hrd = htons(np->dev->type); | |
429 | arp->ar_pro = htons(ETH_P_IP); | |
430 | arp->ar_hln = np->dev->addr_len; | |
431 | arp->ar_pln = 4; | |
432 | arp->ar_op = htons(type); | |
433 | ||
434 | arp_ptr=(unsigned char *)(arp + 1); | |
435 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
436 | arp_ptr += np->dev->addr_len; | |
437 | memcpy(arp_ptr, &tip, 4); | |
438 | arp_ptr += 4; | |
439 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
440 | arp_ptr += np->dev->addr_len; | |
441 | memcpy(arp_ptr, &sip, 4); | |
442 | ||
443 | netpoll_send_skb(np, send_skb); | |
444 | } | |
445 | ||
446 | int __netpoll_rx(struct sk_buff *skb) | |
447 | { | |
448 | int proto, len, ulen; | |
449 | struct iphdr *iph; | |
450 | struct udphdr *uh; | |
fbeec2e1 | 451 | struct netpoll *np = skb->dev->npinfo->rx_np; |
1da177e4 | 452 | |
fbeec2e1 | 453 | if (!np) |
1da177e4 LT |
454 | goto out; |
455 | if (skb->dev->type != ARPHRD_ETHER) | |
456 | goto out; | |
457 | ||
458 | /* check if netpoll clients need ARP */ | |
459 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
460 | atomic_read(&trapped)) { | |
461 | arp_reply(skb); | |
462 | return 1; | |
463 | } | |
464 | ||
465 | proto = ntohs(eth_hdr(skb)->h_proto); | |
466 | if (proto != ETH_P_IP) | |
467 | goto out; | |
468 | if (skb->pkt_type == PACKET_OTHERHOST) | |
469 | goto out; | |
470 | if (skb_shared(skb)) | |
471 | goto out; | |
472 | ||
473 | iph = (struct iphdr *)skb->data; | |
474 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
475 | goto out; | |
476 | if (iph->ihl < 5 || iph->version != 4) | |
477 | goto out; | |
478 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
479 | goto out; | |
480 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
481 | goto out; | |
482 | ||
483 | len = ntohs(iph->tot_len); | |
484 | if (skb->len < len || len < iph->ihl*4) | |
485 | goto out; | |
486 | ||
487 | if (iph->protocol != IPPROTO_UDP) | |
488 | goto out; | |
489 | ||
490 | len -= iph->ihl*4; | |
491 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
492 | ulen = ntohs(uh->len); | |
493 | ||
494 | if (ulen != len) | |
495 | goto out; | |
fb286bb2 | 496 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
497 | goto out; |
498 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
499 | goto out; | |
500 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
501 | goto out; | |
502 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
503 | goto out; | |
504 | ||
505 | np->rx_hook(np, ntohs(uh->source), | |
506 | (char *)(uh+1), | |
507 | ulen - sizeof(struct udphdr)); | |
508 | ||
509 | kfree_skb(skb); | |
510 | return 1; | |
511 | ||
512 | out: | |
513 | if (atomic_read(&trapped)) { | |
514 | kfree_skb(skb); | |
515 | return 1; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
522 | { | |
523 | char *cur=opt, *delim; | |
524 | ||
525 | if(*cur != '@') { | |
526 | if ((delim = strchr(cur, '@')) == NULL) | |
527 | goto parse_failed; | |
528 | *delim=0; | |
529 | np->local_port=simple_strtol(cur, NULL, 10); | |
530 | cur=delim; | |
531 | } | |
532 | cur++; | |
533 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
534 | ||
535 | if(*cur != '/') { | |
536 | if ((delim = strchr(cur, '/')) == NULL) | |
537 | goto parse_failed; | |
538 | *delim=0; | |
539 | np->local_ip=ntohl(in_aton(cur)); | |
540 | cur=delim; | |
541 | ||
542 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
543 | np->name, HIPQUAD(np->local_ip)); | |
544 | } | |
545 | cur++; | |
546 | ||
547 | if ( *cur != ',') { | |
548 | /* parse out dev name */ | |
549 | if ((delim = strchr(cur, ',')) == NULL) | |
550 | goto parse_failed; | |
551 | *delim=0; | |
552 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); | |
553 | cur=delim; | |
554 | } | |
555 | cur++; | |
556 | ||
557 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
558 | ||
559 | if ( *cur != '@' ) { | |
560 | /* dst port */ | |
561 | if ((delim = strchr(cur, '@')) == NULL) | |
562 | goto parse_failed; | |
563 | *delim=0; | |
564 | np->remote_port=simple_strtol(cur, NULL, 10); | |
565 | cur=delim; | |
566 | } | |
567 | cur++; | |
568 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
569 | ||
570 | /* dst ip */ | |
571 | if ((delim = strchr(cur, '/')) == NULL) | |
572 | goto parse_failed; | |
573 | *delim=0; | |
574 | np->remote_ip=ntohl(in_aton(cur)); | |
575 | cur=delim+1; | |
576 | ||
577 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
578 | np->name, HIPQUAD(np->remote_ip)); | |
579 | ||
580 | if( *cur != 0 ) | |
581 | { | |
582 | /* MAC address */ | |
583 | if ((delim = strchr(cur, ':')) == NULL) | |
584 | goto parse_failed; | |
585 | *delim=0; | |
586 | np->remote_mac[0]=simple_strtol(cur, NULL, 16); | |
587 | cur=delim+1; | |
588 | if ((delim = strchr(cur, ':')) == NULL) | |
589 | goto parse_failed; | |
590 | *delim=0; | |
591 | np->remote_mac[1]=simple_strtol(cur, NULL, 16); | |
592 | cur=delim+1; | |
593 | if ((delim = strchr(cur, ':')) == NULL) | |
594 | goto parse_failed; | |
595 | *delim=0; | |
596 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); | |
597 | cur=delim+1; | |
598 | if ((delim = strchr(cur, ':')) == NULL) | |
599 | goto parse_failed; | |
600 | *delim=0; | |
601 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); | |
602 | cur=delim+1; | |
603 | if ((delim = strchr(cur, ':')) == NULL) | |
604 | goto parse_failed; | |
605 | *delim=0; | |
606 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); | |
607 | cur=delim+1; | |
608 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); | |
609 | } | |
610 | ||
611 | printk(KERN_INFO "%s: remote ethernet address " | |
612 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
613 | np->name, | |
614 | np->remote_mac[0], | |
615 | np->remote_mac[1], | |
616 | np->remote_mac[2], | |
617 | np->remote_mac[3], | |
618 | np->remote_mac[4], | |
619 | np->remote_mac[5]); | |
620 | ||
621 | return 0; | |
622 | ||
623 | parse_failed: | |
624 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
625 | np->name, cur); | |
626 | return -1; | |
627 | } | |
628 | ||
629 | int netpoll_setup(struct netpoll *np) | |
630 | { | |
631 | struct net_device *ndev = NULL; | |
632 | struct in_device *in_dev; | |
115c1d6e | 633 | struct netpoll_info *npinfo; |
fbeec2e1 | 634 | unsigned long flags; |
1da177e4 LT |
635 | |
636 | if (np->dev_name) | |
637 | ndev = dev_get_by_name(np->dev_name); | |
638 | if (!ndev) { | |
639 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
640 | np->name, np->dev_name); | |
641 | return -1; | |
642 | } | |
643 | ||
644 | np->dev = ndev; | |
115c1d6e JM |
645 | if (!ndev->npinfo) { |
646 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
647 | if (!npinfo) | |
648 | goto release; | |
649 | ||
11513128 | 650 | npinfo->rx_flags = 0; |
fbeec2e1 | 651 | npinfo->rx_np = NULL; |
a9f6a0dd | 652 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 653 | npinfo->poll_owner = -1; |
0db1d6fc | 654 | npinfo->tries = MAX_RETRIES; |
a9f6a0dd | 655 | spin_lock_init(&npinfo->rx_lock); |
115c1d6e JM |
656 | } else |
657 | npinfo = ndev->npinfo; | |
1da177e4 LT |
658 | |
659 | if (!ndev->poll_controller) { | |
660 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
661 | np->name, np->dev_name); | |
662 | goto release; | |
663 | } | |
664 | ||
665 | if (!netif_running(ndev)) { | |
666 | unsigned long atmost, atleast; | |
667 | ||
668 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
669 | np->name, np->dev_name); | |
670 | ||
671 | rtnl_shlock(); | |
672 | if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) { | |
673 | printk(KERN_ERR "%s: failed to open %s\n", | |
674 | np->name, np->dev_name); | |
675 | rtnl_shunlock(); | |
676 | goto release; | |
677 | } | |
678 | rtnl_shunlock(); | |
679 | ||
680 | atleast = jiffies + HZ/10; | |
681 | atmost = jiffies + 4*HZ; | |
682 | while (!netif_carrier_ok(ndev)) { | |
683 | if (time_after(jiffies, atmost)) { | |
684 | printk(KERN_NOTICE | |
685 | "%s: timeout waiting for carrier\n", | |
686 | np->name); | |
687 | break; | |
688 | } | |
689 | cond_resched(); | |
690 | } | |
691 | ||
692 | /* If carrier appears to come up instantly, we don't | |
693 | * trust it and pause so that we don't pump all our | |
694 | * queued console messages into the bitbucket. | |
695 | */ | |
696 | ||
697 | if (time_before(jiffies, atleast)) { | |
698 | printk(KERN_NOTICE "%s: carrier detect appears" | |
699 | " untrustworthy, waiting 4 seconds\n", | |
700 | np->name); | |
701 | msleep(4000); | |
702 | } | |
703 | } | |
704 | ||
705 | if (!memcmp(np->local_mac, "\0\0\0\0\0\0", 6) && ndev->dev_addr) | |
706 | memcpy(np->local_mac, ndev->dev_addr, 6); | |
707 | ||
708 | if (!np->local_ip) { | |
709 | rcu_read_lock(); | |
e5ed6399 | 710 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
711 | |
712 | if (!in_dev || !in_dev->ifa_list) { | |
713 | rcu_read_unlock(); | |
714 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
715 | np->name, np->dev_name); | |
716 | goto release; | |
717 | } | |
718 | ||
719 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
720 | rcu_read_unlock(); | |
721 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
722 | np->name, HIPQUAD(np->local_ip)); | |
723 | } | |
724 | ||
fbeec2e1 JM |
725 | if (np->rx_hook) { |
726 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
727 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
728 | npinfo->rx_np = np; | |
729 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
730 | } | |
26520765 IM |
731 | |
732 | /* fill up the skb queue */ | |
733 | refill_skbs(); | |
734 | ||
fbeec2e1 | 735 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 736 | ndev->npinfo = npinfo; |
1da177e4 | 737 | |
53fb95d3 MM |
738 | /* avoid racing with NAPI reading npinfo */ |
739 | synchronize_rcu(); | |
740 | ||
1da177e4 LT |
741 | return 0; |
742 | ||
743 | release: | |
115c1d6e JM |
744 | if (!ndev->npinfo) |
745 | kfree(npinfo); | |
1da177e4 LT |
746 | np->dev = NULL; |
747 | dev_put(ndev); | |
748 | return -1; | |
749 | } | |
750 | ||
751 | void netpoll_cleanup(struct netpoll *np) | |
752 | { | |
fbeec2e1 JM |
753 | struct netpoll_info *npinfo; |
754 | unsigned long flags; | |
755 | ||
115c1d6e | 756 | if (np->dev) { |
fbeec2e1 JM |
757 | npinfo = np->dev->npinfo; |
758 | if (npinfo && npinfo->rx_np == np) { | |
759 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
760 | npinfo->rx_np = NULL; | |
761 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
762 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
763 | } | |
115c1d6e JM |
764 | dev_put(np->dev); |
765 | } | |
fbeec2e1 | 766 | |
1da177e4 LT |
767 | np->dev = NULL; |
768 | } | |
769 | ||
770 | int netpoll_trap(void) | |
771 | { | |
772 | return atomic_read(&trapped); | |
773 | } | |
774 | ||
775 | void netpoll_set_trap(int trap) | |
776 | { | |
777 | if (trap) | |
778 | atomic_inc(&trapped); | |
779 | else | |
780 | atomic_dec(&trapped); | |
781 | } | |
782 | ||
783 | EXPORT_SYMBOL(netpoll_set_trap); | |
784 | EXPORT_SYMBOL(netpoll_trap); | |
785 | EXPORT_SYMBOL(netpoll_parse_options); | |
786 | EXPORT_SYMBOL(netpoll_setup); | |
787 | EXPORT_SYMBOL(netpoll_cleanup); | |
788 | EXPORT_SYMBOL(netpoll_send_udp); | |
789 | EXPORT_SYMBOL(netpoll_poll); | |
790 | EXPORT_SYMBOL(netpoll_queue); |