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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/moduleparam.h> |
13 | #include <linux/netdevice.h> |
14 | #include <linux/etherdevice.h> |
15 | #include <linux/string.h> |
16 | #include <linux/if_arp.h> |
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 | #include <trace/events/napi.h> |
29 | |
30 | /* |
31 | * We maintain a small pool of fully-sized skbs, to make sure the |
32 | * message gets out even in extreme OOM situations. |
33 | */ |
34 | |
35 | #define MAX_UDP_CHUNK 1460 |
36 | #define MAX_SKBS 32 |
37 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
38 | |
39 | static struct sk_buff_head skb_pool; |
40 | |
41 | static atomic_t trapped; |
42 | |
43 | #define USEC_PER_POLL 50 |
44 | #define NETPOLL_RX_ENABLED 1 |
45 | #define NETPOLL_RX_DROP 2 |
46 | |
47 | #define MAX_SKB_SIZE \ |
48 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
49 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
50 | |
51 | static void zap_completion_queue(void); |
52 | static void arp_reply(struct sk_buff *skb); |
53 | |
54 | static unsigned int carrier_timeout = 4; |
55 | module_param(carrier_timeout, uint, 0644); |
56 | |
57 | static void queue_process(struct work_struct *work) |
58 | { |
59 | struct netpoll_info *npinfo = |
60 | container_of(work, struct netpoll_info, tx_work.work); |
61 | struct sk_buff *skb; |
62 | unsigned long flags; |
63 | |
64 | while ((skb = skb_dequeue(&npinfo->txq))) { |
65 | struct net_device *dev = skb->dev; |
66 | const struct net_device_ops *ops = dev->netdev_ops; |
67 | struct netdev_queue *txq; |
68 | |
69 | if (!netif_device_present(dev) || !netif_running(dev)) { |
70 | __kfree_skb(skb); |
71 | continue; |
72 | } |
73 | |
74 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
75 | |
76 | local_irq_save(flags); |
77 | __netif_tx_lock(txq, smp_processor_id()); |
78 | if (netif_tx_queue_stopped(txq) || |
79 | netif_tx_queue_frozen(txq) || |
80 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
81 | skb_queue_head(&npinfo->txq, skb); |
82 | __netif_tx_unlock(txq); |
83 | local_irq_restore(flags); |
84 | |
85 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
86 | return; |
87 | } |
88 | __netif_tx_unlock(txq); |
89 | local_irq_restore(flags); |
90 | } |
91 | } |
92 | |
93 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
94 | unsigned short ulen, __be32 saddr, __be32 daddr) |
95 | { |
96 | __wsum psum; |
97 | |
98 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
99 | return 0; |
100 | |
101 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
102 | |
103 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
104 | !csum_fold(csum_add(psum, skb->csum))) |
105 | return 0; |
106 | |
107 | skb->csum = psum; |
108 | |
109 | return __skb_checksum_complete(skb); |
110 | } |
111 | |
112 | /* |
113 | * Check whether delayed processing was scheduled for our NIC. If so, |
114 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
115 | * If this fails, either we've recursed in ->poll() or it's already |
116 | * running on another CPU. |
117 | * |
118 | * Note: we don't mask interrupts with this lock because we're using |
119 | * trylock here and interrupts are already disabled in the softirq |
120 | * case. Further, we test the poll_owner to avoid recursion on UP |
121 | * systems where the lock doesn't exist. |
122 | * |
123 | * In cases where there is bi-directional communications, reading only |
124 | * one message at a time can lead to packets being dropped by the |
125 | * network adapter, forcing superfluous retries and possibly timeouts. |
126 | * Thus, we set our budget to greater than 1. |
127 | */ |
128 | static int poll_one_napi(struct netpoll_info *npinfo, |
129 | struct napi_struct *napi, int budget) |
130 | { |
131 | int work; |
132 | |
133 | /* net_rx_action's ->poll() invocations and our's are |
134 | * synchronized by this test which is only made while |
135 | * holding the napi->poll_lock. |
136 | */ |
137 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) |
138 | return budget; |
139 | |
140 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
141 | atomic_inc(&trapped); |
142 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
143 | |
144 | work = napi->poll(napi, budget); |
145 | trace_napi_poll(napi); |
146 | |
147 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
148 | atomic_dec(&trapped); |
149 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
150 | |
151 | return budget - work; |
152 | } |
153 | |
154 | static void poll_napi(struct net_device *dev) |
155 | { |
156 | struct napi_struct *napi; |
157 | int budget = 16; |
158 | |
159 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
160 | if (napi->poll_owner != smp_processor_id() && |
161 | spin_trylock(&napi->poll_lock)) { |
162 | budget = poll_one_napi(dev->npinfo, napi, budget); |
163 | spin_unlock(&napi->poll_lock); |
164 | |
165 | if (!budget) |
166 | break; |
167 | } |
168 | } |
169 | } |
170 | |
171 | static void service_arp_queue(struct netpoll_info *npi) |
172 | { |
173 | if (npi) { |
174 | struct sk_buff *skb; |
175 | |
176 | while ((skb = skb_dequeue(&npi->arp_tx))) |
177 | arp_reply(skb); |
178 | } |
179 | } |
180 | |
181 | void netpoll_poll(struct netpoll *np) |
182 | { |
183 | struct net_device *dev = np->dev; |
184 | const struct net_device_ops *ops; |
185 | |
186 | if (!dev || !netif_running(dev)) |
187 | return; |
188 | |
189 | ops = dev->netdev_ops; |
190 | if (!ops->ndo_poll_controller) |
191 | return; |
192 | |
193 | /* Process pending work on NIC */ |
194 | ops->ndo_poll_controller(dev); |
195 | |
196 | poll_napi(dev); |
197 | |
198 | service_arp_queue(dev->npinfo); |
199 | |
200 | zap_completion_queue(); |
201 | } |
202 | |
203 | static void refill_skbs(void) |
204 | { |
205 | struct sk_buff *skb; |
206 | unsigned long flags; |
207 | |
208 | spin_lock_irqsave(&skb_pool.lock, flags); |
209 | while (skb_pool.qlen < MAX_SKBS) { |
210 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
211 | if (!skb) |
212 | break; |
213 | |
214 | __skb_queue_tail(&skb_pool, skb); |
215 | } |
216 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
217 | } |
218 | |
219 | static void zap_completion_queue(void) |
220 | { |
221 | unsigned long flags; |
222 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
223 | |
224 | if (sd->completion_queue) { |
225 | struct sk_buff *clist; |
226 | |
227 | local_irq_save(flags); |
228 | clist = sd->completion_queue; |
229 | sd->completion_queue = NULL; |
230 | local_irq_restore(flags); |
231 | |
232 | while (clist != NULL) { |
233 | struct sk_buff *skb = clist; |
234 | clist = clist->next; |
235 | if (skb->destructor) { |
236 | atomic_inc(&skb->users); |
237 | dev_kfree_skb_any(skb); /* put this one back */ |
238 | } else { |
239 | __kfree_skb(skb); |
240 | } |
241 | } |
242 | } |
243 | |
244 | put_cpu_var(softnet_data); |
245 | } |
246 | |
247 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
248 | { |
249 | int count = 0; |
250 | struct sk_buff *skb; |
251 | |
252 | zap_completion_queue(); |
253 | refill_skbs(); |
254 | repeat: |
255 | |
256 | skb = alloc_skb(len, GFP_ATOMIC); |
257 | if (!skb) |
258 | skb = skb_dequeue(&skb_pool); |
259 | |
260 | if (!skb) { |
261 | if (++count < 10) { |
262 | netpoll_poll(np); |
263 | goto repeat; |
264 | } |
265 | return NULL; |
266 | } |
267 | |
268 | atomic_set(&skb->users, 1); |
269 | skb_reserve(skb, reserve); |
270 | return skb; |
271 | } |
272 | |
273 | static int netpoll_owner_active(struct net_device *dev) |
274 | { |
275 | struct napi_struct *napi; |
276 | |
277 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
278 | if (napi->poll_owner == smp_processor_id()) |
279 | return 1; |
280 | } |
281 | return 0; |
282 | } |
283 | |
284 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
285 | { |
286 | int status = NETDEV_TX_BUSY; |
287 | unsigned long tries; |
288 | struct net_device *dev = np->dev; |
289 | const struct net_device_ops *ops = dev->netdev_ops; |
290 | struct netpoll_info *npinfo = np->dev->npinfo; |
291 | |
292 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
293 | __kfree_skb(skb); |
294 | return; |
295 | } |
296 | |
297 | /* don't get messages out of order, and no recursion */ |
298 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
299 | struct netdev_queue *txq; |
300 | unsigned long flags; |
301 | |
302 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
303 | |
304 | local_irq_save(flags); |
305 | /* try until next clock tick */ |
306 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
307 | tries > 0; --tries) { |
308 | if (__netif_tx_trylock(txq)) { |
309 | if (!netif_tx_queue_stopped(txq)) { |
310 | status = ops->ndo_start_xmit(skb, dev); |
311 | if (status == NETDEV_TX_OK) |
312 | txq_trans_update(txq); |
313 | } |
314 | __netif_tx_unlock(txq); |
315 | |
316 | if (status == NETDEV_TX_OK) |
317 | break; |
318 | |
319 | } |
320 | |
321 | /* tickle device maybe there is some cleanup */ |
322 | netpoll_poll(np); |
323 | |
324 | udelay(USEC_PER_POLL); |
325 | } |
326 | |
327 | WARN_ONCE(!irqs_disabled(), |
328 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", |
329 | dev->name, ops->ndo_start_xmit); |
330 | |
331 | local_irq_restore(flags); |
332 | } |
333 | |
334 | if (status != NETDEV_TX_OK) { |
335 | skb_queue_tail(&npinfo->txq, skb); |
336 | schedule_delayed_work(&npinfo->tx_work,0); |
337 | } |
338 | } |
339 | |
340 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
341 | { |
342 | int total_len, eth_len, ip_len, udp_len; |
343 | struct sk_buff *skb; |
344 | struct udphdr *udph; |
345 | struct iphdr *iph; |
346 | struct ethhdr *eth; |
347 | |
348 | udp_len = len + sizeof(*udph); |
349 | ip_len = eth_len = udp_len + sizeof(*iph); |
350 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
351 | |
352 | skb = find_skb(np, total_len, total_len - len); |
353 | if (!skb) |
354 | return; |
355 | |
356 | skb_copy_to_linear_data(skb, msg, len); |
357 | skb->len += len; |
358 | |
359 | skb_push(skb, sizeof(*udph)); |
360 | skb_reset_transport_header(skb); |
361 | udph = udp_hdr(skb); |
362 | udph->source = htons(np->local_port); |
363 | udph->dest = htons(np->remote_port); |
364 | udph->len = htons(udp_len); |
365 | udph->check = 0; |
366 | udph->check = csum_tcpudp_magic(np->local_ip, |
367 | np->remote_ip, |
368 | udp_len, IPPROTO_UDP, |
369 | csum_partial(udph, udp_len, 0)); |
370 | if (udph->check == 0) |
371 | udph->check = CSUM_MANGLED_0; |
372 | |
373 | skb_push(skb, sizeof(*iph)); |
374 | skb_reset_network_header(skb); |
375 | iph = ip_hdr(skb); |
376 | |
377 | /* iph->version = 4; iph->ihl = 5; */ |
378 | put_unaligned(0x45, (unsigned char *)iph); |
379 | iph->tos = 0; |
380 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
381 | iph->id = 0; |
382 | iph->frag_off = 0; |
383 | iph->ttl = 64; |
384 | iph->protocol = IPPROTO_UDP; |
385 | iph->check = 0; |
386 | put_unaligned(np->local_ip, &(iph->saddr)); |
387 | put_unaligned(np->remote_ip, &(iph->daddr)); |
388 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
389 | |
390 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
391 | skb_reset_mac_header(skb); |
392 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
393 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
394 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); |
395 | |
396 | skb->dev = np->dev; |
397 | |
398 | netpoll_send_skb(np, skb); |
399 | } |
400 | |
401 | static void arp_reply(struct sk_buff *skb) |
402 | { |
403 | struct netpoll_info *npinfo = skb->dev->npinfo; |
404 | struct arphdr *arp; |
405 | unsigned char *arp_ptr; |
406 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
407 | __be32 sip, tip; |
408 | unsigned char *sha; |
409 | struct sk_buff *send_skb; |
410 | struct netpoll *np = NULL; |
411 | |
412 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
413 | np = npinfo->rx_np; |
414 | if (!np) |
415 | return; |
416 | |
417 | /* No arp on this interface */ |
418 | if (skb->dev->flags & IFF_NOARP) |
419 | return; |
420 | |
421 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
422 | return; |
423 | |
424 | skb_reset_network_header(skb); |
425 | skb_reset_transport_header(skb); |
426 | arp = arp_hdr(skb); |
427 | |
428 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
429 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
430 | arp->ar_pro != htons(ETH_P_IP) || |
431 | arp->ar_op != htons(ARPOP_REQUEST)) |
432 | return; |
433 | |
434 | arp_ptr = (unsigned char *)(arp+1); |
435 | /* save the location of the src hw addr */ |
436 | sha = arp_ptr; |
437 | arp_ptr += skb->dev->addr_len; |
438 | memcpy(&sip, arp_ptr, 4); |
439 | arp_ptr += 4; |
440 | /* if we actually cared about dst hw addr, it would get copied here */ |
441 | arp_ptr += skb->dev->addr_len; |
442 | memcpy(&tip, arp_ptr, 4); |
443 | |
444 | /* Should we ignore arp? */ |
445 | if (tip != np->local_ip || |
446 | ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
447 | return; |
448 | |
449 | size = arp_hdr_len(skb->dev); |
450 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
451 | LL_RESERVED_SPACE(np->dev)); |
452 | |
453 | if (!send_skb) |
454 | return; |
455 | |
456 | skb_reset_network_header(send_skb); |
457 | arp = (struct arphdr *) skb_put(send_skb, size); |
458 | send_skb->dev = skb->dev; |
459 | send_skb->protocol = htons(ETH_P_ARP); |
460 | |
461 | /* Fill the device header for the ARP frame */ |
462 | if (dev_hard_header(send_skb, skb->dev, ptype, |
463 | sha, np->dev->dev_addr, |
464 | send_skb->len) < 0) { |
465 | kfree_skb(send_skb); |
466 | return; |
467 | } |
468 | |
469 | /* |
470 | * Fill out the arp protocol part. |
471 | * |
472 | * we only support ethernet device type, |
473 | * which (according to RFC 1390) should always equal 1 (Ethernet). |
474 | */ |
475 | |
476 | arp->ar_hrd = htons(np->dev->type); |
477 | arp->ar_pro = htons(ETH_P_IP); |
478 | arp->ar_hln = np->dev->addr_len; |
479 | arp->ar_pln = 4; |
480 | arp->ar_op = htons(type); |
481 | |
482 | arp_ptr=(unsigned char *)(arp + 1); |
483 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
484 | arp_ptr += np->dev->addr_len; |
485 | memcpy(arp_ptr, &tip, 4); |
486 | arp_ptr += 4; |
487 | memcpy(arp_ptr, sha, np->dev->addr_len); |
488 | arp_ptr += np->dev->addr_len; |
489 | memcpy(arp_ptr, &sip, 4); |
490 | |
491 | netpoll_send_skb(np, send_skb); |
492 | } |
493 | |
494 | int __netpoll_rx(struct sk_buff *skb) |
495 | { |
496 | int proto, len, ulen; |
497 | struct iphdr *iph; |
498 | struct udphdr *uh; |
499 | struct netpoll_info *npi = skb->dev->npinfo; |
500 | struct netpoll *np = npi->rx_np; |
501 | |
502 | if (!np) |
503 | goto out; |
504 | if (skb->dev->type != ARPHRD_ETHER) |
505 | goto out; |
506 | |
507 | /* check if netpoll clients need ARP */ |
508 | if (skb->protocol == htons(ETH_P_ARP) && |
509 | atomic_read(&trapped)) { |
510 | skb_queue_tail(&npi->arp_tx, skb); |
511 | return 1; |
512 | } |
513 | |
514 | proto = ntohs(eth_hdr(skb)->h_proto); |
515 | if (proto != ETH_P_IP) |
516 | goto out; |
517 | if (skb->pkt_type == PACKET_OTHERHOST) |
518 | goto out; |
519 | if (skb_shared(skb)) |
520 | goto out; |
521 | |
522 | iph = (struct iphdr *)skb->data; |
523 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
524 | goto out; |
525 | if (iph->ihl < 5 || iph->version != 4) |
526 | goto out; |
527 | if (!pskb_may_pull(skb, iph->ihl*4)) |
528 | goto out; |
529 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
530 | goto out; |
531 | |
532 | len = ntohs(iph->tot_len); |
533 | if (skb->len < len || len < iph->ihl*4) |
534 | goto out; |
535 | |
536 | /* |
537 | * Our transport medium may have padded the buffer out. |
538 | * Now We trim to the true length of the frame. |
539 | */ |
540 | if (pskb_trim_rcsum(skb, len)) |
541 | goto out; |
542 | |
543 | if (iph->protocol != IPPROTO_UDP) |
544 | goto out; |
545 | |
546 | len -= iph->ihl*4; |
547 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
548 | ulen = ntohs(uh->len); |
549 | |
550 | if (ulen != len) |
551 | goto out; |
552 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
553 | goto out; |
554 | if (np->local_ip && np->local_ip != iph->daddr) |
555 | goto out; |
556 | if (np->remote_ip && np->remote_ip != iph->saddr) |
557 | goto out; |
558 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
559 | goto out; |
560 | |
561 | np->rx_hook(np, ntohs(uh->source), |
562 | (char *)(uh+1), |
563 | ulen - sizeof(struct udphdr)); |
564 | |
565 | kfree_skb(skb); |
566 | return 1; |
567 | |
568 | out: |
569 | if (atomic_read(&trapped)) { |
570 | kfree_skb(skb); |
571 | return 1; |
572 | } |
573 | |
574 | return 0; |
575 | } |
576 | |
577 | void netpoll_print_options(struct netpoll *np) |
578 | { |
579 | printk(KERN_INFO "%s: local port %d\n", |
580 | np->name, np->local_port); |
581 | printk(KERN_INFO "%s: local IP %pI4\n", |
582 | np->name, &np->local_ip); |
583 | printk(KERN_INFO "%s: interface %s\n", |
584 | np->name, np->dev_name); |
585 | printk(KERN_INFO "%s: remote port %d\n", |
586 | np->name, np->remote_port); |
587 | printk(KERN_INFO "%s: remote IP %pI4\n", |
588 | np->name, &np->remote_ip); |
589 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
590 | np->name, np->remote_mac); |
591 | } |
592 | |
593 | int netpoll_parse_options(struct netpoll *np, char *opt) |
594 | { |
595 | char *cur=opt, *delim; |
596 | |
597 | if (*cur != '@') { |
598 | if ((delim = strchr(cur, '@')) == NULL) |
599 | goto parse_failed; |
600 | *delim = 0; |
601 | np->local_port = simple_strtol(cur, NULL, 10); |
602 | cur = delim; |
603 | } |
604 | cur++; |
605 | |
606 | if (*cur != '/') { |
607 | if ((delim = strchr(cur, '/')) == NULL) |
608 | goto parse_failed; |
609 | *delim = 0; |
610 | np->local_ip = in_aton(cur); |
611 | cur = delim; |
612 | } |
613 | cur++; |
614 | |
615 | if (*cur != ',') { |
616 | /* parse out dev name */ |
617 | if ((delim = strchr(cur, ',')) == NULL) |
618 | goto parse_failed; |
619 | *delim = 0; |
620 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
621 | cur = delim; |
622 | } |
623 | cur++; |
624 | |
625 | if (*cur != '@') { |
626 | /* dst port */ |
627 | if ((delim = strchr(cur, '@')) == NULL) |
628 | goto parse_failed; |
629 | *delim = 0; |
630 | np->remote_port = simple_strtol(cur, NULL, 10); |
631 | cur = delim; |
632 | } |
633 | cur++; |
634 | |
635 | /* dst ip */ |
636 | if ((delim = strchr(cur, '/')) == NULL) |
637 | goto parse_failed; |
638 | *delim = 0; |
639 | np->remote_ip = in_aton(cur); |
640 | cur = delim + 1; |
641 | |
642 | if (*cur != 0) { |
643 | /* MAC address */ |
644 | if ((delim = strchr(cur, ':')) == NULL) |
645 | goto parse_failed; |
646 | *delim = 0; |
647 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); |
648 | cur = delim + 1; |
649 | if ((delim = strchr(cur, ':')) == NULL) |
650 | goto parse_failed; |
651 | *delim = 0; |
652 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); |
653 | cur = delim + 1; |
654 | if ((delim = strchr(cur, ':')) == NULL) |
655 | goto parse_failed; |
656 | *delim = 0; |
657 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); |
658 | cur = delim + 1; |
659 | if ((delim = strchr(cur, ':')) == NULL) |
660 | goto parse_failed; |
661 | *delim = 0; |
662 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); |
663 | cur = delim + 1; |
664 | if ((delim = strchr(cur, ':')) == NULL) |
665 | goto parse_failed; |
666 | *delim = 0; |
667 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); |
668 | cur = delim + 1; |
669 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); |
670 | } |
671 | |
672 | netpoll_print_options(np); |
673 | |
674 | return 0; |
675 | |
676 | parse_failed: |
677 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", |
678 | np->name, cur); |
679 | return -1; |
680 | } |
681 | |
682 | int netpoll_setup(struct netpoll *np) |
683 | { |
684 | struct net_device *ndev = NULL; |
685 | struct in_device *in_dev; |
686 | struct netpoll_info *npinfo; |
687 | unsigned long flags; |
688 | int err; |
689 | |
690 | if (np->dev_name) |
691 | ndev = dev_get_by_name(&init_net, np->dev_name); |
692 | if (!ndev) { |
693 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
694 | np->name, np->dev_name); |
695 | return -ENODEV; |
696 | } |
697 | |
698 | np->dev = ndev; |
699 | if (!ndev->npinfo) { |
700 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
701 | if (!npinfo) { |
702 | err = -ENOMEM; |
703 | goto release; |
704 | } |
705 | |
706 | npinfo->rx_flags = 0; |
707 | npinfo->rx_np = NULL; |
708 | |
709 | spin_lock_init(&npinfo->rx_lock); |
710 | skb_queue_head_init(&npinfo->arp_tx); |
711 | skb_queue_head_init(&npinfo->txq); |
712 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
713 | |
714 | atomic_set(&npinfo->refcnt, 1); |
715 | } else { |
716 | npinfo = ndev->npinfo; |
717 | atomic_inc(&npinfo->refcnt); |
718 | } |
719 | |
720 | if (!ndev->netdev_ops->ndo_poll_controller) { |
721 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
722 | np->name, np->dev_name); |
723 | err = -ENOTSUPP; |
724 | goto release; |
725 | } |
726 | |
727 | if (!netif_running(ndev)) { |
728 | unsigned long atmost, atleast; |
729 | |
730 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
731 | np->name, np->dev_name); |
732 | |
733 | rtnl_lock(); |
734 | err = dev_open(ndev); |
735 | rtnl_unlock(); |
736 | |
737 | if (err) { |
738 | printk(KERN_ERR "%s: failed to open %s\n", |
739 | np->name, ndev->name); |
740 | goto release; |
741 | } |
742 | |
743 | atleast = jiffies + HZ/10; |
744 | atmost = jiffies + carrier_timeout * HZ; |
745 | while (!netif_carrier_ok(ndev)) { |
746 | if (time_after(jiffies, atmost)) { |
747 | printk(KERN_NOTICE |
748 | "%s: timeout waiting for carrier\n", |
749 | np->name); |
750 | break; |
751 | } |
752 | msleep(1); |
753 | } |
754 | |
755 | /* If carrier appears to come up instantly, we don't |
756 | * trust it and pause so that we don't pump all our |
757 | * queued console messages into the bitbucket. |
758 | */ |
759 | |
760 | if (time_before(jiffies, atleast)) { |
761 | printk(KERN_NOTICE "%s: carrier detect appears" |
762 | " untrustworthy, waiting 4 seconds\n", |
763 | np->name); |
764 | msleep(4000); |
765 | } |
766 | } |
767 | |
768 | if (!np->local_ip) { |
769 | rcu_read_lock(); |
770 | in_dev = __in_dev_get_rcu(ndev); |
771 | |
772 | if (!in_dev || !in_dev->ifa_list) { |
773 | rcu_read_unlock(); |
774 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
775 | np->name, np->dev_name); |
776 | err = -EDESTADDRREQ; |
777 | goto release; |
778 | } |
779 | |
780 | np->local_ip = in_dev->ifa_list->ifa_local; |
781 | rcu_read_unlock(); |
782 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
783 | } |
784 | |
785 | if (np->rx_hook) { |
786 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
787 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
788 | npinfo->rx_np = np; |
789 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
790 | } |
791 | |
792 | /* fill up the skb queue */ |
793 | refill_skbs(); |
794 | |
795 | /* last thing to do is link it to the net device structure */ |
796 | ndev->npinfo = npinfo; |
797 | |
798 | /* avoid racing with NAPI reading npinfo */ |
799 | synchronize_rcu(); |
800 | |
801 | return 0; |
802 | |
803 | release: |
804 | if (!ndev->npinfo) |
805 | kfree(npinfo); |
806 | np->dev = NULL; |
807 | dev_put(ndev); |
808 | return err; |
809 | } |
810 | |
811 | static int __init netpoll_init(void) |
812 | { |
813 | skb_queue_head_init(&skb_pool); |
814 | return 0; |
815 | } |
816 | core_initcall(netpoll_init); |
817 | |
818 | void netpoll_cleanup(struct netpoll *np) |
819 | { |
820 | struct netpoll_info *npinfo; |
821 | unsigned long flags; |
822 | |
823 | if (np->dev) { |
824 | npinfo = np->dev->npinfo; |
825 | if (npinfo) { |
826 | if (npinfo->rx_np == np) { |
827 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
828 | npinfo->rx_np = NULL; |
829 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
830 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
831 | } |
832 | |
833 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
834 | skb_queue_purge(&npinfo->arp_tx); |
835 | skb_queue_purge(&npinfo->txq); |
836 | cancel_rearming_delayed_work(&npinfo->tx_work); |
837 | |
838 | /* clean after last, unfinished work */ |
839 | __skb_queue_purge(&npinfo->txq); |
840 | kfree(npinfo); |
841 | np->dev->npinfo = NULL; |
842 | } |
843 | } |
844 | |
845 | dev_put(np->dev); |
846 | } |
847 | |
848 | np->dev = NULL; |
849 | } |
850 | |
851 | int netpoll_trap(void) |
852 | { |
853 | return atomic_read(&trapped); |
854 | } |
855 | |
856 | void netpoll_set_trap(int trap) |
857 | { |
858 | if (trap) |
859 | atomic_inc(&trapped); |
860 | else |
861 | atomic_dec(&trapped); |
862 | } |
863 | |
864 | EXPORT_SYMBOL(netpoll_set_trap); |
865 | EXPORT_SYMBOL(netpoll_trap); |
866 | EXPORT_SYMBOL(netpoll_print_options); |
867 | EXPORT_SYMBOL(netpoll_parse_options); |
868 | EXPORT_SYMBOL(netpoll_setup); |
869 | EXPORT_SYMBOL(netpoll_cleanup); |
870 | EXPORT_SYMBOL(netpoll_send_udp); |
871 | EXPORT_SYMBOL(netpoll_poll); |
872 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9