]>
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> | |
14c85021 | 16 | #include <linux/if_arp.h> |
1da177e4 LT |
17 | #include <linux/inetdevice.h> |
18 | #include <linux/inet.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/netpoll.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/rcupdate.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <net/tcp.h> | |
26 | #include <net/udp.h> | |
27 | #include <asm/unaligned.h> | |
28 | ||
29 | /* | |
30 | * We maintain a small pool of fully-sized skbs, to make sure the | |
31 | * message gets out even in extreme OOM situations. | |
32 | */ | |
33 | ||
34 | #define MAX_UDP_CHUNK 1460 | |
35 | #define MAX_SKBS 32 | |
36 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
0db1d6fc | 37 | #define MAX_RETRIES 20000 |
1da177e4 LT |
38 | |
39 | static DEFINE_SPINLOCK(skb_list_lock); | |
40 | static int nr_skbs; | |
41 | static struct sk_buff *skbs; | |
42 | ||
43 | static DEFINE_SPINLOCK(queue_lock); | |
44 | static int queue_depth; | |
45 | static struct sk_buff *queue_head, *queue_tail; | |
46 | ||
47 | static atomic_t trapped; | |
48 | ||
49 | #define NETPOLL_RX_ENABLED 1 | |
50 | #define NETPOLL_RX_DROP 2 | |
51 | ||
52 | #define MAX_SKB_SIZE \ | |
53 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
54 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
55 | ||
56 | static void zap_completion_queue(void); | |
57 | ||
58 | static void queue_process(void *p) | |
59 | { | |
60 | unsigned long flags; | |
61 | struct sk_buff *skb; | |
62 | ||
63 | while (queue_head) { | |
64 | spin_lock_irqsave(&queue_lock, flags); | |
65 | ||
66 | skb = queue_head; | |
67 | queue_head = skb->next; | |
68 | if (skb == queue_tail) | |
69 | queue_head = NULL; | |
70 | ||
71 | queue_depth--; | |
72 | ||
73 | spin_unlock_irqrestore(&queue_lock, flags); | |
74 | ||
75 | dev_queue_xmit(skb); | |
76 | } | |
77 | } | |
78 | ||
79 | static DECLARE_WORK(send_queue, queue_process, NULL); | |
80 | ||
81 | void netpoll_queue(struct sk_buff *skb) | |
82 | { | |
83 | unsigned long flags; | |
84 | ||
85 | if (queue_depth == MAX_QUEUE_DEPTH) { | |
86 | __kfree_skb(skb); | |
87 | return; | |
88 | } | |
89 | ||
90 | spin_lock_irqsave(&queue_lock, flags); | |
91 | if (!queue_head) | |
92 | queue_head = skb; | |
93 | else | |
94 | queue_tail->next = skb; | |
95 | queue_tail = skb; | |
96 | queue_depth++; | |
97 | spin_unlock_irqrestore(&queue_lock, flags); | |
98 | ||
99 | schedule_work(&send_queue); | |
100 | } | |
101 | ||
102 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, | |
103 | unsigned short ulen, u32 saddr, u32 daddr) | |
104 | { | |
fb286bb2 HX |
105 | unsigned int psum; |
106 | ||
107 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
108 | return 0; |
109 | ||
fb286bb2 HX |
110 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
111 | ||
112 | if (skb->ip_summed == CHECKSUM_HW && | |
113 | !(u16)csum_fold(csum_add(psum, skb->csum))) | |
114 | return 0; | |
1da177e4 | 115 | |
fb286bb2 | 116 | skb->csum = psum; |
1da177e4 | 117 | |
fb286bb2 | 118 | return __skb_checksum_complete(skb); |
1da177e4 LT |
119 | } |
120 | ||
121 | /* | |
122 | * Check whether delayed processing was scheduled for our NIC. If so, | |
123 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
124 | * If this fails, either we've recursed in ->poll() or it's already | |
125 | * running on another CPU. | |
126 | * | |
127 | * Note: we don't mask interrupts with this lock because we're using | |
128 | * trylock here and interrupts are already disabled in the softirq | |
129 | * case. Further, we test the poll_owner to avoid recursion on UP | |
130 | * systems where the lock doesn't exist. | |
131 | * | |
132 | * In cases where there is bi-directional communications, reading only | |
133 | * one message at a time can lead to packets being dropped by the | |
134 | * network adapter, forcing superfluous retries and possibly timeouts. | |
135 | * Thus, we set our budget to greater than 1. | |
136 | */ | |
137 | static void poll_napi(struct netpoll *np) | |
138 | { | |
115c1d6e | 139 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
140 | int budget = 16; |
141 | ||
142 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
143 | npinfo->poll_owner != smp_processor_id() && |
144 | spin_trylock(&npinfo->poll_lock)) { | |
145 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
146 | atomic_inc(&trapped); |
147 | ||
148 | np->dev->poll(np->dev, &budget); | |
149 | ||
150 | atomic_dec(&trapped); | |
115c1d6e JM |
151 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
152 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
153 | } |
154 | } | |
155 | ||
156 | void netpoll_poll(struct netpoll *np) | |
157 | { | |
158 | if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) | |
159 | return; | |
160 | ||
161 | /* Process pending work on NIC */ | |
162 | np->dev->poll_controller(np->dev); | |
163 | if (np->dev->poll) | |
164 | poll_napi(np); | |
165 | ||
166 | zap_completion_queue(); | |
167 | } | |
168 | ||
169 | static void refill_skbs(void) | |
170 | { | |
171 | struct sk_buff *skb; | |
172 | unsigned long flags; | |
173 | ||
174 | spin_lock_irqsave(&skb_list_lock, flags); | |
175 | while (nr_skbs < MAX_SKBS) { | |
176 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); | |
177 | if (!skb) | |
178 | break; | |
179 | ||
180 | skb->next = skbs; | |
181 | skbs = skb; | |
182 | nr_skbs++; | |
183 | } | |
184 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
185 | } | |
186 | ||
187 | static void zap_completion_queue(void) | |
188 | { | |
189 | unsigned long flags; | |
190 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
191 | ||
192 | if (sd->completion_queue) { | |
193 | struct sk_buff *clist; | |
194 | ||
195 | local_irq_save(flags); | |
196 | clist = sd->completion_queue; | |
197 | sd->completion_queue = NULL; | |
198 | local_irq_restore(flags); | |
199 | ||
200 | while (clist != NULL) { | |
201 | struct sk_buff *skb = clist; | |
202 | clist = clist->next; | |
203 | if(skb->destructor) | |
204 | dev_kfree_skb_any(skb); /* put this one back */ | |
205 | else | |
206 | __kfree_skb(skb); | |
207 | } | |
208 | } | |
209 | ||
210 | put_cpu_var(softnet_data); | |
211 | } | |
212 | ||
213 | static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve) | |
214 | { | |
215 | int once = 1, count = 0; | |
216 | unsigned long flags; | |
217 | struct sk_buff *skb = NULL; | |
218 | ||
219 | zap_completion_queue(); | |
220 | repeat: | |
221 | if (nr_skbs < MAX_SKBS) | |
222 | refill_skbs(); | |
223 | ||
224 | skb = alloc_skb(len, GFP_ATOMIC); | |
225 | ||
226 | if (!skb) { | |
227 | spin_lock_irqsave(&skb_list_lock, flags); | |
228 | skb = skbs; | |
229 | if (skb) { | |
230 | skbs = skb->next; | |
231 | skb->next = NULL; | |
232 | nr_skbs--; | |
233 | } | |
234 | spin_unlock_irqrestore(&skb_list_lock, flags); | |
235 | } | |
236 | ||
237 | if(!skb) { | |
238 | count++; | |
239 | if (once && (count == 1000000)) { | |
240 | printk("out of netpoll skbs!\n"); | |
241 | once = 0; | |
242 | } | |
243 | netpoll_poll(np); | |
244 | goto repeat; | |
245 | } | |
246 | ||
247 | atomic_set(&skb->users, 1); | |
248 | skb_reserve(skb, reserve); | |
249 | return skb; | |
250 | } | |
251 | ||
252 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
253 | { | |
254 | int status; | |
115c1d6e | 255 | struct netpoll_info *npinfo; |
1da177e4 | 256 | |
f0d3459d | 257 | if (!np || !np->dev || !netif_running(np->dev)) { |
1da177e4 LT |
258 | __kfree_skb(skb); |
259 | return; | |
260 | } | |
261 | ||
115c1d6e | 262 | npinfo = np->dev->npinfo; |
f0d3459d MM |
263 | |
264 | /* avoid recursion */ | |
115c1d6e JM |
265 | if (npinfo->poll_owner == smp_processor_id() || |
266 | np->dev->xmit_lock_owner == smp_processor_id()) { | |
1da177e4 LT |
267 | if (np->drop) |
268 | np->drop(skb); | |
269 | else | |
270 | __kfree_skb(skb); | |
271 | return; | |
272 | } | |
273 | ||
0db1d6fc MM |
274 | do { |
275 | npinfo->tries--; | |
932ff279 | 276 | netif_tx_lock(np->dev); |
f0d3459d MM |
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)) { | |
932ff279 | 283 | netif_tx_unlock(np->dev); |
f0d3459d | 284 | netpoll_poll(np); |
0db1d6fc | 285 | udelay(50); |
f0d3459d MM |
286 | continue; |
287 | } | |
1da177e4 | 288 | |
f0d3459d | 289 | status = np->dev->hard_start_xmit(skb, np->dev); |
932ff279 | 290 | netif_tx_unlock(np->dev); |
1da177e4 | 291 | |
f0d3459d | 292 | /* success */ |
0db1d6fc MM |
293 | if(!status) { |
294 | npinfo->tries = MAX_RETRIES; /* reset */ | |
f0d3459d | 295 | return; |
0db1d6fc | 296 | } |
1da177e4 | 297 | |
f0d3459d | 298 | /* transmit busy */ |
1da177e4 | 299 | netpoll_poll(np); |
0db1d6fc MM |
300 | udelay(50); |
301 | } while (npinfo->tries > 0); | |
1da177e4 LT |
302 | } |
303 | ||
304 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
305 | { | |
306 | int total_len, eth_len, ip_len, udp_len; | |
307 | struct sk_buff *skb; | |
308 | struct udphdr *udph; | |
309 | struct iphdr *iph; | |
310 | struct ethhdr *eth; | |
311 | ||
312 | udp_len = len + sizeof(*udph); | |
313 | ip_len = eth_len = udp_len + sizeof(*iph); | |
314 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
315 | ||
316 | skb = find_skb(np, total_len, total_len - len); | |
317 | if (!skb) | |
318 | return; | |
319 | ||
320 | memcpy(skb->data, msg, len); | |
321 | skb->len += len; | |
322 | ||
323 | udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); | |
324 | udph->source = htons(np->local_port); | |
325 | udph->dest = htons(np->remote_port); | |
326 | udph->len = htons(udp_len); | |
327 | udph->check = 0; | |
328 | ||
329 | iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); | |
330 | ||
331 | /* iph->version = 4; iph->ihl = 5; */ | |
332 | put_unaligned(0x45, (unsigned char *)iph); | |
333 | iph->tos = 0; | |
334 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
335 | iph->id = 0; | |
336 | iph->frag_off = 0; | |
337 | iph->ttl = 64; | |
338 | iph->protocol = IPPROTO_UDP; | |
339 | iph->check = 0; | |
340 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
341 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
342 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
343 | ||
344 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
345 | ||
346 | eth->h_proto = htons(ETH_P_IP); | |
347 | memcpy(eth->h_source, np->local_mac, 6); | |
348 | memcpy(eth->h_dest, np->remote_mac, 6); | |
349 | ||
350 | skb->dev = np->dev; | |
351 | ||
352 | netpoll_send_skb(np, skb); | |
353 | } | |
354 | ||
355 | static void arp_reply(struct sk_buff *skb) | |
356 | { | |
115c1d6e | 357 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
358 | struct arphdr *arp; |
359 | unsigned char *arp_ptr; | |
360 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
361 | u32 sip, tip; | |
362 | struct sk_buff *send_skb; | |
115c1d6e | 363 | struct netpoll *np = NULL; |
1da177e4 | 364 | |
fbeec2e1 JM |
365 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
366 | np = npinfo->rx_np; | |
115c1d6e JM |
367 | if (!np) |
368 | return; | |
1da177e4 LT |
369 | |
370 | /* No arp on this interface */ | |
371 | if (skb->dev->flags & IFF_NOARP) | |
372 | return; | |
373 | ||
374 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
375 | (2 * skb->dev->addr_len) + | |
376 | (2 * sizeof(u32))))) | |
377 | return; | |
378 | ||
379 | skb->h.raw = skb->nh.raw = skb->data; | |
380 | arp = skb->nh.arph; | |
381 | ||
382 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
383 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
384 | arp->ar_pro != htons(ETH_P_IP) || | |
385 | arp->ar_op != htons(ARPOP_REQUEST)) | |
386 | return; | |
387 | ||
388 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
389 | memcpy(&sip, arp_ptr, 4); | |
390 | arp_ptr += 4 + skb->dev->addr_len; | |
391 | memcpy(&tip, arp_ptr, 4); | |
392 | ||
393 | /* Should we ignore arp? */ | |
394 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
395 | return; | |
396 | ||
397 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
398 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
399 | LL_RESERVED_SPACE(np->dev)); | |
400 | ||
401 | if (!send_skb) | |
402 | return; | |
403 | ||
404 | send_skb->nh.raw = send_skb->data; | |
405 | arp = (struct arphdr *) skb_put(send_skb, size); | |
406 | send_skb->dev = skb->dev; | |
407 | send_skb->protocol = htons(ETH_P_ARP); | |
408 | ||
409 | /* Fill the device header for the ARP frame */ | |
410 | ||
411 | if (np->dev->hard_header && | |
412 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
413 | np->remote_mac, np->local_mac, | |
414 | send_skb->len) < 0) { | |
415 | kfree_skb(send_skb); | |
416 | return; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Fill out the arp protocol part. | |
421 | * | |
422 | * we only support ethernet device type, | |
423 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
424 | */ | |
425 | ||
426 | arp->ar_hrd = htons(np->dev->type); | |
427 | arp->ar_pro = htons(ETH_P_IP); | |
428 | arp->ar_hln = np->dev->addr_len; | |
429 | arp->ar_pln = 4; | |
430 | arp->ar_op = htons(type); | |
431 | ||
432 | arp_ptr=(unsigned char *)(arp + 1); | |
433 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
434 | arp_ptr += np->dev->addr_len; | |
435 | memcpy(arp_ptr, &tip, 4); | |
436 | arp_ptr += 4; | |
437 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
438 | arp_ptr += np->dev->addr_len; | |
439 | memcpy(arp_ptr, &sip, 4); | |
440 | ||
441 | netpoll_send_skb(np, send_skb); | |
442 | } | |
443 | ||
444 | int __netpoll_rx(struct sk_buff *skb) | |
445 | { | |
446 | int proto, len, ulen; | |
447 | struct iphdr *iph; | |
448 | struct udphdr *uh; | |
fbeec2e1 | 449 | struct netpoll *np = skb->dev->npinfo->rx_np; |
1da177e4 | 450 | |
fbeec2e1 | 451 | if (!np) |
1da177e4 LT |
452 | goto out; |
453 | if (skb->dev->type != ARPHRD_ETHER) | |
454 | goto out; | |
455 | ||
456 | /* check if netpoll clients need ARP */ | |
457 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
458 | atomic_read(&trapped)) { | |
459 | arp_reply(skb); | |
460 | return 1; | |
461 | } | |
462 | ||
463 | proto = ntohs(eth_hdr(skb)->h_proto); | |
464 | if (proto != ETH_P_IP) | |
465 | goto out; | |
466 | if (skb->pkt_type == PACKET_OTHERHOST) | |
467 | goto out; | |
468 | if (skb_shared(skb)) | |
469 | goto out; | |
470 | ||
471 | iph = (struct iphdr *)skb->data; | |
472 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
473 | goto out; | |
474 | if (iph->ihl < 5 || iph->version != 4) | |
475 | goto out; | |
476 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
477 | goto out; | |
478 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
479 | goto out; | |
480 | ||
481 | len = ntohs(iph->tot_len); | |
482 | if (skb->len < len || len < iph->ihl*4) | |
483 | goto out; | |
484 | ||
485 | if (iph->protocol != IPPROTO_UDP) | |
486 | goto out; | |
487 | ||
488 | len -= iph->ihl*4; | |
489 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
490 | ulen = ntohs(uh->len); | |
491 | ||
492 | if (ulen != len) | |
493 | goto out; | |
fb286bb2 | 494 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
495 | goto out; |
496 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
497 | goto out; | |
498 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
499 | goto out; | |
500 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
501 | goto out; | |
502 | ||
503 | np->rx_hook(np, ntohs(uh->source), | |
504 | (char *)(uh+1), | |
505 | ulen - sizeof(struct udphdr)); | |
506 | ||
507 | kfree_skb(skb); | |
508 | return 1; | |
509 | ||
510 | out: | |
511 | if (atomic_read(&trapped)) { | |
512 | kfree_skb(skb); | |
513 | return 1; | |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
520 | { | |
521 | char *cur=opt, *delim; | |
522 | ||
523 | if(*cur != '@') { | |
524 | if ((delim = strchr(cur, '@')) == NULL) | |
525 | goto parse_failed; | |
526 | *delim=0; | |
527 | np->local_port=simple_strtol(cur, NULL, 10); | |
528 | cur=delim; | |
529 | } | |
530 | cur++; | |
531 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
532 | ||
533 | if(*cur != '/') { | |
534 | if ((delim = strchr(cur, '/')) == NULL) | |
535 | goto parse_failed; | |
536 | *delim=0; | |
537 | np->local_ip=ntohl(in_aton(cur)); | |
538 | cur=delim; | |
539 | ||
540 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
541 | np->name, HIPQUAD(np->local_ip)); | |
542 | } | |
543 | cur++; | |
544 | ||
545 | if ( *cur != ',') { | |
546 | /* parse out dev name */ | |
547 | if ((delim = strchr(cur, ',')) == NULL) | |
548 | goto parse_failed; | |
549 | *delim=0; | |
550 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); | |
551 | cur=delim; | |
552 | } | |
553 | cur++; | |
554 | ||
555 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
556 | ||
557 | if ( *cur != '@' ) { | |
558 | /* dst port */ | |
559 | if ((delim = strchr(cur, '@')) == NULL) | |
560 | goto parse_failed; | |
561 | *delim=0; | |
562 | np->remote_port=simple_strtol(cur, NULL, 10); | |
563 | cur=delim; | |
564 | } | |
565 | cur++; | |
566 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
567 | ||
568 | /* dst ip */ | |
569 | if ((delim = strchr(cur, '/')) == NULL) | |
570 | goto parse_failed; | |
571 | *delim=0; | |
572 | np->remote_ip=ntohl(in_aton(cur)); | |
573 | cur=delim+1; | |
574 | ||
575 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
576 | np->name, HIPQUAD(np->remote_ip)); | |
577 | ||
578 | if( *cur != 0 ) | |
579 | { | |
580 | /* MAC address */ | |
581 | if ((delim = strchr(cur, ':')) == NULL) | |
582 | goto parse_failed; | |
583 | *delim=0; | |
584 | np->remote_mac[0]=simple_strtol(cur, NULL, 16); | |
585 | cur=delim+1; | |
586 | if ((delim = strchr(cur, ':')) == NULL) | |
587 | goto parse_failed; | |
588 | *delim=0; | |
589 | np->remote_mac[1]=simple_strtol(cur, NULL, 16); | |
590 | cur=delim+1; | |
591 | if ((delim = strchr(cur, ':')) == NULL) | |
592 | goto parse_failed; | |
593 | *delim=0; | |
594 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); | |
595 | cur=delim+1; | |
596 | if ((delim = strchr(cur, ':')) == NULL) | |
597 | goto parse_failed; | |
598 | *delim=0; | |
599 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); | |
600 | cur=delim+1; | |
601 | if ((delim = strchr(cur, ':')) == NULL) | |
602 | goto parse_failed; | |
603 | *delim=0; | |
604 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); | |
605 | cur=delim+1; | |
606 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); | |
607 | } | |
608 | ||
609 | printk(KERN_INFO "%s: remote ethernet address " | |
610 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
611 | np->name, | |
612 | np->remote_mac[0], | |
613 | np->remote_mac[1], | |
614 | np->remote_mac[2], | |
615 | np->remote_mac[3], | |
616 | np->remote_mac[4], | |
617 | np->remote_mac[5]); | |
618 | ||
619 | return 0; | |
620 | ||
621 | parse_failed: | |
622 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
623 | np->name, cur); | |
624 | return -1; | |
625 | } | |
626 | ||
627 | int netpoll_setup(struct netpoll *np) | |
628 | { | |
629 | struct net_device *ndev = NULL; | |
630 | struct in_device *in_dev; | |
115c1d6e | 631 | struct netpoll_info *npinfo; |
fbeec2e1 | 632 | unsigned long flags; |
1da177e4 LT |
633 | |
634 | if (np->dev_name) | |
635 | ndev = dev_get_by_name(np->dev_name); | |
636 | if (!ndev) { | |
637 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
638 | np->name, np->dev_name); | |
639 | return -1; | |
640 | } | |
641 | ||
642 | np->dev = ndev; | |
115c1d6e JM |
643 | if (!ndev->npinfo) { |
644 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
645 | if (!npinfo) | |
646 | goto release; | |
647 | ||
11513128 | 648 | npinfo->rx_flags = 0; |
fbeec2e1 | 649 | npinfo->rx_np = NULL; |
a9f6a0dd | 650 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 651 | npinfo->poll_owner = -1; |
0db1d6fc | 652 | npinfo->tries = MAX_RETRIES; |
a9f6a0dd | 653 | spin_lock_init(&npinfo->rx_lock); |
115c1d6e JM |
654 | } else |
655 | npinfo = ndev->npinfo; | |
1da177e4 LT |
656 | |
657 | if (!ndev->poll_controller) { | |
658 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
659 | np->name, np->dev_name); | |
660 | goto release; | |
661 | } | |
662 | ||
663 | if (!netif_running(ndev)) { | |
664 | unsigned long atmost, atleast; | |
665 | ||
666 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
667 | np->name, np->dev_name); | |
668 | ||
6756ae4b | 669 | rtnl_lock(); |
1da177e4 LT |
670 | if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) { |
671 | printk(KERN_ERR "%s: failed to open %s\n", | |
672 | np->name, np->dev_name); | |
6756ae4b | 673 | rtnl_unlock(); |
1da177e4 LT |
674 | goto release; |
675 | } | |
6756ae4b | 676 | rtnl_unlock(); |
1da177e4 LT |
677 | |
678 | atleast = jiffies + HZ/10; | |
679 | atmost = jiffies + 4*HZ; | |
680 | while (!netif_carrier_ok(ndev)) { | |
681 | if (time_after(jiffies, atmost)) { | |
682 | printk(KERN_NOTICE | |
683 | "%s: timeout waiting for carrier\n", | |
684 | np->name); | |
685 | break; | |
686 | } | |
687 | cond_resched(); | |
688 | } | |
689 | ||
690 | /* If carrier appears to come up instantly, we don't | |
691 | * trust it and pause so that we don't pump all our | |
692 | * queued console messages into the bitbucket. | |
693 | */ | |
694 | ||
695 | if (time_before(jiffies, atleast)) { | |
696 | printk(KERN_NOTICE "%s: carrier detect appears" | |
697 | " untrustworthy, waiting 4 seconds\n", | |
698 | np->name); | |
699 | msleep(4000); | |
700 | } | |
701 | } | |
702 | ||
3860288e | 703 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
704 | memcpy(np->local_mac, ndev->dev_addr, 6); |
705 | ||
706 | if (!np->local_ip) { | |
707 | rcu_read_lock(); | |
e5ed6399 | 708 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
709 | |
710 | if (!in_dev || !in_dev->ifa_list) { | |
711 | rcu_read_unlock(); | |
712 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
713 | np->name, np->dev_name); | |
714 | goto release; | |
715 | } | |
716 | ||
717 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
718 | rcu_read_unlock(); | |
719 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
720 | np->name, HIPQUAD(np->local_ip)); | |
721 | } | |
722 | ||
fbeec2e1 JM |
723 | if (np->rx_hook) { |
724 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
725 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
726 | npinfo->rx_np = np; | |
727 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
728 | } | |
26520765 IM |
729 | |
730 | /* fill up the skb queue */ | |
731 | refill_skbs(); | |
732 | ||
fbeec2e1 | 733 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 734 | ndev->npinfo = npinfo; |
1da177e4 | 735 | |
53fb95d3 MM |
736 | /* avoid racing with NAPI reading npinfo */ |
737 | synchronize_rcu(); | |
738 | ||
1da177e4 LT |
739 | return 0; |
740 | ||
741 | release: | |
115c1d6e JM |
742 | if (!ndev->npinfo) |
743 | kfree(npinfo); | |
1da177e4 LT |
744 | np->dev = NULL; |
745 | dev_put(ndev); | |
746 | return -1; | |
747 | } | |
748 | ||
749 | void netpoll_cleanup(struct netpoll *np) | |
750 | { | |
fbeec2e1 JM |
751 | struct netpoll_info *npinfo; |
752 | unsigned long flags; | |
753 | ||
115c1d6e | 754 | if (np->dev) { |
fbeec2e1 JM |
755 | npinfo = np->dev->npinfo; |
756 | if (npinfo && npinfo->rx_np == np) { | |
757 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
758 | npinfo->rx_np = NULL; | |
759 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
760 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
761 | } | |
115c1d6e JM |
762 | dev_put(np->dev); |
763 | } | |
fbeec2e1 | 764 | |
1da177e4 LT |
765 | np->dev = NULL; |
766 | } | |
767 | ||
768 | int netpoll_trap(void) | |
769 | { | |
770 | return atomic_read(&trapped); | |
771 | } | |
772 | ||
773 | void netpoll_set_trap(int trap) | |
774 | { | |
775 | if (trap) | |
776 | atomic_inc(&trapped); | |
777 | else | |
778 | atomic_dec(&trapped); | |
779 | } | |
780 | ||
781 | EXPORT_SYMBOL(netpoll_set_trap); | |
782 | EXPORT_SYMBOL(netpoll_trap); | |
783 | EXPORT_SYMBOL(netpoll_parse_options); | |
784 | EXPORT_SYMBOL(netpoll_setup); | |
785 | EXPORT_SYMBOL(netpoll_cleanup); | |
786 | EXPORT_SYMBOL(netpoll_send_udp); | |
787 | EXPORT_SYMBOL(netpoll_poll); | |
788 | EXPORT_SYMBOL(netpoll_queue); |