]>
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) | |
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 | { | |
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 | */ | |
132 | static void poll_napi(struct netpoll *np) | |
133 | { | |
115c1d6e | 134 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
135 | int budget = 16; |
136 | ||
137 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
138 | npinfo->poll_owner != smp_processor_id() && |
139 | spin_trylock(&npinfo->poll_lock)) { | |
140 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
141 | atomic_inc(&trapped); |
142 | ||
143 | np->dev->poll(np->dev, &budget); | |
144 | ||
145 | atomic_dec(&trapped); | |
115c1d6e JM |
146 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
147 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
148 | } |
149 | } | |
150 | ||
151 | void 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 | ||
164 | static 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 | ||
182 | static 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 | ||
208 | static 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(); | |
215 | repeat: | |
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 | ||
247 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
248 | { | |
249 | int status; | |
115c1d6e | 250 | struct netpoll_info *npinfo; |
1da177e4 | 251 | |
f0d3459d | 252 | if (!np || !np->dev || !netif_running(np->dev)) { |
1da177e4 LT |
253 | __kfree_skb(skb); |
254 | return; | |
255 | } | |
256 | ||
115c1d6e | 257 | npinfo = np->dev->npinfo; |
f0d3459d MM |
258 | |
259 | /* avoid recursion */ | |
115c1d6e JM |
260 | if (npinfo->poll_owner == smp_processor_id() || |
261 | np->dev->xmit_lock_owner == smp_processor_id()) { | |
1da177e4 LT |
262 | if (np->drop) |
263 | np->drop(skb); | |
264 | else | |
265 | __kfree_skb(skb); | |
266 | return; | |
267 | } | |
268 | ||
0db1d6fc MM |
269 | do { |
270 | npinfo->tries--; | |
f0d3459d MM |
271 | spin_lock(&np->dev->xmit_lock); |
272 | np->dev->xmit_lock_owner = smp_processor_id(); | |
273 | ||
274 | /* | |
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); | |
0db1d6fc | 282 | udelay(50); |
f0d3459d MM |
283 | continue; |
284 | } | |
1da177e4 | 285 | |
f0d3459d | 286 | status = np->dev->hard_start_xmit(skb, np->dev); |
1da177e4 LT |
287 | np->dev->xmit_lock_owner = -1; |
288 | spin_unlock(&np->dev->xmit_lock); | |
289 | ||
f0d3459d | 290 | /* success */ |
0db1d6fc MM |
291 | if(!status) { |
292 | npinfo->tries = MAX_RETRIES; /* reset */ | |
f0d3459d | 293 | return; |
0db1d6fc | 294 | } |
1da177e4 | 295 | |
f0d3459d | 296 | /* transmit busy */ |
1da177e4 | 297 | netpoll_poll(np); |
0db1d6fc MM |
298 | udelay(50); |
299 | } while (npinfo->tries > 0); | |
1da177e4 LT |
300 | } |
301 | ||
302 | void 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 | ||
353 | static void arp_reply(struct sk_buff *skb) | |
354 | { | |
115c1d6e | 355 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
356 | struct arphdr *arp; |
357 | unsigned char *arp_ptr; | |
358 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
359 | u32 sip, tip; | |
360 | struct sk_buff *send_skb; | |
115c1d6e | 361 | struct netpoll *np = NULL; |
1da177e4 | 362 | |
fbeec2e1 JM |
363 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
364 | np = npinfo->rx_np; | |
115c1d6e JM |
365 | if (!np) |
366 | return; | |
1da177e4 LT |
367 | |
368 | /* No arp on this interface */ | |
369 | if (skb->dev->flags & IFF_NOARP) | |
370 | return; | |
371 | ||
372 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
373 | (2 * skb->dev->addr_len) + | |
374 | (2 * sizeof(u32))))) | |
375 | return; | |
376 | ||
377 | skb->h.raw = skb->nh.raw = skb->data; | |
378 | arp = skb->nh.arph; | |
379 | ||
380 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
381 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
382 | arp->ar_pro != htons(ETH_P_IP) || | |
383 | arp->ar_op != htons(ARPOP_REQUEST)) | |
384 | return; | |
385 | ||
386 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
387 | memcpy(&sip, arp_ptr, 4); | |
388 | arp_ptr += 4 + skb->dev->addr_len; | |
389 | memcpy(&tip, arp_ptr, 4); | |
390 | ||
391 | /* Should we ignore arp? */ | |
392 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
393 | return; | |
394 | ||
395 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
396 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
397 | LL_RESERVED_SPACE(np->dev)); | |
398 | ||
399 | if (!send_skb) | |
400 | return; | |
401 | ||
402 | send_skb->nh.raw = send_skb->data; | |
403 | arp = (struct arphdr *) skb_put(send_skb, size); | |
404 | send_skb->dev = skb->dev; | |
405 | send_skb->protocol = htons(ETH_P_ARP); | |
406 | ||
407 | /* Fill the device header for the ARP frame */ | |
408 | ||
409 | if (np->dev->hard_header && | |
410 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
411 | np->remote_mac, np->local_mac, | |
412 | send_skb->len) < 0) { | |
413 | kfree_skb(send_skb); | |
414 | return; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Fill out the arp protocol part. | |
419 | * | |
420 | * we only support ethernet device type, | |
421 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
422 | */ | |
423 | ||
424 | arp->ar_hrd = htons(np->dev->type); | |
425 | arp->ar_pro = htons(ETH_P_IP); | |
426 | arp->ar_hln = np->dev->addr_len; | |
427 | arp->ar_pln = 4; | |
428 | arp->ar_op = htons(type); | |
429 | ||
430 | arp_ptr=(unsigned char *)(arp + 1); | |
431 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
432 | arp_ptr += np->dev->addr_len; | |
433 | memcpy(arp_ptr, &tip, 4); | |
434 | arp_ptr += 4; | |
435 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
436 | arp_ptr += np->dev->addr_len; | |
437 | memcpy(arp_ptr, &sip, 4); | |
438 | ||
439 | netpoll_send_skb(np, send_skb); | |
440 | } | |
441 | ||
442 | int __netpoll_rx(struct sk_buff *skb) | |
443 | { | |
444 | int proto, len, ulen; | |
445 | struct iphdr *iph; | |
446 | struct udphdr *uh; | |
fbeec2e1 | 447 | struct netpoll *np = skb->dev->npinfo->rx_np; |
1da177e4 | 448 | |
fbeec2e1 | 449 | if (!np) |
1da177e4 LT |
450 | goto out; |
451 | if (skb->dev->type != ARPHRD_ETHER) | |
452 | goto out; | |
453 | ||
454 | /* check if netpoll clients need ARP */ | |
455 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
456 | atomic_read(&trapped)) { | |
457 | arp_reply(skb); | |
458 | return 1; | |
459 | } | |
460 | ||
461 | proto = ntohs(eth_hdr(skb)->h_proto); | |
462 | if (proto != ETH_P_IP) | |
463 | goto out; | |
464 | if (skb->pkt_type == PACKET_OTHERHOST) | |
465 | goto out; | |
466 | if (skb_shared(skb)) | |
467 | goto out; | |
468 | ||
469 | iph = (struct iphdr *)skb->data; | |
470 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
471 | goto out; | |
472 | if (iph->ihl < 5 || iph->version != 4) | |
473 | goto out; | |
474 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
475 | goto out; | |
476 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
477 | goto out; | |
478 | ||
479 | len = ntohs(iph->tot_len); | |
480 | if (skb->len < len || len < iph->ihl*4) | |
481 | goto out; | |
482 | ||
483 | if (iph->protocol != IPPROTO_UDP) | |
484 | goto out; | |
485 | ||
486 | len -= iph->ihl*4; | |
487 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
488 | ulen = ntohs(uh->len); | |
489 | ||
490 | if (ulen != len) | |
491 | goto out; | |
492 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr) < 0) | |
493 | goto out; | |
494 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
495 | goto out; | |
496 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
497 | goto out; | |
498 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
499 | goto out; | |
500 | ||
501 | np->rx_hook(np, ntohs(uh->source), | |
502 | (char *)(uh+1), | |
503 | ulen - sizeof(struct udphdr)); | |
504 | ||
505 | kfree_skb(skb); | |
506 | return 1; | |
507 | ||
508 | out: | |
509 | if (atomic_read(&trapped)) { | |
510 | kfree_skb(skb); | |
511 | return 1; | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
518 | { | |
519 | char *cur=opt, *delim; | |
520 | ||
521 | if(*cur != '@') { | |
522 | if ((delim = strchr(cur, '@')) == NULL) | |
523 | goto parse_failed; | |
524 | *delim=0; | |
525 | np->local_port=simple_strtol(cur, NULL, 10); | |
526 | cur=delim; | |
527 | } | |
528 | cur++; | |
529 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
530 | ||
531 | if(*cur != '/') { | |
532 | if ((delim = strchr(cur, '/')) == NULL) | |
533 | goto parse_failed; | |
534 | *delim=0; | |
535 | np->local_ip=ntohl(in_aton(cur)); | |
536 | cur=delim; | |
537 | ||
538 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
539 | np->name, HIPQUAD(np->local_ip)); | |
540 | } | |
541 | cur++; | |
542 | ||
543 | if ( *cur != ',') { | |
544 | /* parse out dev name */ | |
545 | if ((delim = strchr(cur, ',')) == NULL) | |
546 | goto parse_failed; | |
547 | *delim=0; | |
548 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); | |
549 | cur=delim; | |
550 | } | |
551 | cur++; | |
552 | ||
553 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
554 | ||
555 | if ( *cur != '@' ) { | |
556 | /* dst port */ | |
557 | if ((delim = strchr(cur, '@')) == NULL) | |
558 | goto parse_failed; | |
559 | *delim=0; | |
560 | np->remote_port=simple_strtol(cur, NULL, 10); | |
561 | cur=delim; | |
562 | } | |
563 | cur++; | |
564 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
565 | ||
566 | /* dst ip */ | |
567 | if ((delim = strchr(cur, '/')) == NULL) | |
568 | goto parse_failed; | |
569 | *delim=0; | |
570 | np->remote_ip=ntohl(in_aton(cur)); | |
571 | cur=delim+1; | |
572 | ||
573 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
574 | np->name, HIPQUAD(np->remote_ip)); | |
575 | ||
576 | if( *cur != 0 ) | |
577 | { | |
578 | /* MAC address */ | |
579 | if ((delim = strchr(cur, ':')) == NULL) | |
580 | goto parse_failed; | |
581 | *delim=0; | |
582 | np->remote_mac[0]=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[1]=simple_strtol(cur, NULL, 16); | |
588 | cur=delim+1; | |
589 | if ((delim = strchr(cur, ':')) == NULL) | |
590 | goto parse_failed; | |
591 | *delim=0; | |
592 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); | |
593 | cur=delim+1; | |
594 | if ((delim = strchr(cur, ':')) == NULL) | |
595 | goto parse_failed; | |
596 | *delim=0; | |
597 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); | |
598 | cur=delim+1; | |
599 | if ((delim = strchr(cur, ':')) == NULL) | |
600 | goto parse_failed; | |
601 | *delim=0; | |
602 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); | |
603 | cur=delim+1; | |
604 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); | |
605 | } | |
606 | ||
607 | printk(KERN_INFO "%s: remote ethernet address " | |
608 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
609 | np->name, | |
610 | np->remote_mac[0], | |
611 | np->remote_mac[1], | |
612 | np->remote_mac[2], | |
613 | np->remote_mac[3], | |
614 | np->remote_mac[4], | |
615 | np->remote_mac[5]); | |
616 | ||
617 | return 0; | |
618 | ||
619 | parse_failed: | |
620 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
621 | np->name, cur); | |
622 | return -1; | |
623 | } | |
624 | ||
625 | int netpoll_setup(struct netpoll *np) | |
626 | { | |
627 | struct net_device *ndev = NULL; | |
628 | struct in_device *in_dev; | |
115c1d6e | 629 | struct netpoll_info *npinfo; |
fbeec2e1 | 630 | unsigned long flags; |
1da177e4 LT |
631 | |
632 | if (np->dev_name) | |
633 | ndev = dev_get_by_name(np->dev_name); | |
634 | if (!ndev) { | |
635 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
636 | np->name, np->dev_name); | |
637 | return -1; | |
638 | } | |
639 | ||
640 | np->dev = ndev; | |
115c1d6e JM |
641 | if (!ndev->npinfo) { |
642 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
643 | if (!npinfo) | |
644 | goto release; | |
645 | ||
11513128 | 646 | npinfo->rx_flags = 0; |
fbeec2e1 | 647 | npinfo->rx_np = NULL; |
115c1d6e JM |
648 | npinfo->poll_lock = SPIN_LOCK_UNLOCKED; |
649 | npinfo->poll_owner = -1; | |
0db1d6fc | 650 | npinfo->tries = MAX_RETRIES; |
fbeec2e1 | 651 | npinfo->rx_lock = SPIN_LOCK_UNLOCKED; |
115c1d6e JM |
652 | } else |
653 | npinfo = ndev->npinfo; | |
1da177e4 LT |
654 | |
655 | if (!ndev->poll_controller) { | |
656 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
657 | np->name, np->dev_name); | |
658 | goto release; | |
659 | } | |
660 | ||
661 | if (!netif_running(ndev)) { | |
662 | unsigned long atmost, atleast; | |
663 | ||
664 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
665 | np->name, np->dev_name); | |
666 | ||
667 | rtnl_shlock(); | |
668 | if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) { | |
669 | printk(KERN_ERR "%s: failed to open %s\n", | |
670 | np->name, np->dev_name); | |
671 | rtnl_shunlock(); | |
672 | goto release; | |
673 | } | |
674 | rtnl_shunlock(); | |
675 | ||
676 | atleast = jiffies + HZ/10; | |
677 | atmost = jiffies + 4*HZ; | |
678 | while (!netif_carrier_ok(ndev)) { | |
679 | if (time_after(jiffies, atmost)) { | |
680 | printk(KERN_NOTICE | |
681 | "%s: timeout waiting for carrier\n", | |
682 | np->name); | |
683 | break; | |
684 | } | |
685 | cond_resched(); | |
686 | } | |
687 | ||
688 | /* If carrier appears to come up instantly, we don't | |
689 | * trust it and pause so that we don't pump all our | |
690 | * queued console messages into the bitbucket. | |
691 | */ | |
692 | ||
693 | if (time_before(jiffies, atleast)) { | |
694 | printk(KERN_NOTICE "%s: carrier detect appears" | |
695 | " untrustworthy, waiting 4 seconds\n", | |
696 | np->name); | |
697 | msleep(4000); | |
698 | } | |
699 | } | |
700 | ||
701 | if (!memcmp(np->local_mac, "\0\0\0\0\0\0", 6) && ndev->dev_addr) | |
702 | memcpy(np->local_mac, ndev->dev_addr, 6); | |
703 | ||
704 | if (!np->local_ip) { | |
705 | rcu_read_lock(); | |
706 | in_dev = __in_dev_get(ndev); | |
707 | ||
708 | if (!in_dev || !in_dev->ifa_list) { | |
709 | rcu_read_unlock(); | |
710 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
711 | np->name, np->dev_name); | |
712 | goto release; | |
713 | } | |
714 | ||
715 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
716 | rcu_read_unlock(); | |
717 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
718 | np->name, HIPQUAD(np->local_ip)); | |
719 | } | |
720 | ||
fbeec2e1 JM |
721 | if (np->rx_hook) { |
722 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
723 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
724 | npinfo->rx_np = np; | |
725 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
726 | } | |
26520765 IM |
727 | |
728 | /* fill up the skb queue */ | |
729 | refill_skbs(); | |
730 | ||
fbeec2e1 | 731 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 732 | ndev->npinfo = npinfo; |
1da177e4 | 733 | |
53fb95d3 MM |
734 | /* avoid racing with NAPI reading npinfo */ |
735 | synchronize_rcu(); | |
736 | ||
1da177e4 LT |
737 | return 0; |
738 | ||
739 | release: | |
115c1d6e JM |
740 | if (!ndev->npinfo) |
741 | kfree(npinfo); | |
1da177e4 LT |
742 | np->dev = NULL; |
743 | dev_put(ndev); | |
744 | return -1; | |
745 | } | |
746 | ||
747 | void netpoll_cleanup(struct netpoll *np) | |
748 | { | |
fbeec2e1 JM |
749 | struct netpoll_info *npinfo; |
750 | unsigned long flags; | |
751 | ||
115c1d6e | 752 | if (np->dev) { |
fbeec2e1 JM |
753 | npinfo = np->dev->npinfo; |
754 | if (npinfo && npinfo->rx_np == np) { | |
755 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
756 | npinfo->rx_np = NULL; | |
757 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
758 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
759 | } | |
115c1d6e JM |
760 | dev_put(np->dev); |
761 | } | |
fbeec2e1 | 762 | |
1da177e4 LT |
763 | np->dev = NULL; |
764 | } | |
765 | ||
766 | int netpoll_trap(void) | |
767 | { | |
768 | return atomic_read(&trapped); | |
769 | } | |
770 | ||
771 | void netpoll_set_trap(int trap) | |
772 | { | |
773 | if (trap) | |
774 | atomic_inc(&trapped); | |
775 | else | |
776 | atomic_dec(&trapped); | |
777 | } | |
778 | ||
779 | EXPORT_SYMBOL(netpoll_set_trap); | |
780 | EXPORT_SYMBOL(netpoll_trap); | |
781 | EXPORT_SYMBOL(netpoll_parse_options); | |
782 | EXPORT_SYMBOL(netpoll_setup); | |
783 | EXPORT_SYMBOL(netpoll_cleanup); | |
784 | EXPORT_SYMBOL(netpoll_send_udp); | |
785 | EXPORT_SYMBOL(netpoll_poll); | |
786 | EXPORT_SYMBOL(netpoll_queue); |