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 | ||
e6ec2693 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
bff38771 | 14 | #include <linux/moduleparam.h> |
4cd5773a | 15 | #include <linux/kernel.h> |
1da177e4 LT |
16 | #include <linux/netdevice.h> |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/string.h> | |
14c85021 | 19 | #include <linux/if_arp.h> |
1da177e4 LT |
20 | #include <linux/inetdevice.h> |
21 | #include <linux/inet.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/netpoll.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/rcupdate.h> | |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
689971b4 | 30 | #include <linux/if_vlan.h> |
1da177e4 LT |
31 | #include <net/tcp.h> |
32 | #include <net/udp.h> | |
b3d936f3 CW |
33 | #include <net/addrconf.h> |
34 | #include <net/ndisc.h> | |
35 | #include <net/ip6_checksum.h> | |
1da177e4 | 36 | #include <asm/unaligned.h> |
9cbc1cb8 | 37 | #include <trace/events/napi.h> |
1da177e4 LT |
38 | |
39 | /* | |
40 | * We maintain a small pool of fully-sized skbs, to make sure the | |
41 | * message gets out even in extreme OOM situations. | |
42 | */ | |
43 | ||
44 | #define MAX_UDP_CHUNK 1460 | |
45 | #define MAX_SKBS 32 | |
1da177e4 | 46 | |
a1bcfacd | 47 | static struct sk_buff_head skb_pool; |
1da177e4 | 48 | |
7f9421c2 | 49 | DEFINE_STATIC_SRCU(netpoll_srcu); |
ca99ca14 | 50 | |
2bdfe0ba | 51 | #define USEC_PER_POLL 50 |
1da177e4 | 52 | |
6f706245 JP |
53 | #define MAX_SKB_SIZE \ |
54 | (sizeof(struct ethhdr) + \ | |
55 | sizeof(struct iphdr) + \ | |
56 | sizeof(struct udphdr) + \ | |
57 | MAX_UDP_CHUNK) | |
1da177e4 | 58 | |
3578b0c8 | 59 | static void zap_completion_queue(void); |
2cde6acd | 60 | static void netpoll_async_cleanup(struct work_struct *work); |
1da177e4 | 61 | |
bff38771 AV |
62 | static unsigned int carrier_timeout = 4; |
63 | module_param(carrier_timeout, uint, 0644); | |
64 | ||
e6ec2693 JP |
65 | #define np_info(np, fmt, ...) \ |
66 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
67 | #define np_err(np, fmt, ...) \ | |
68 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
69 | #define np_notice(np, fmt, ...) \ | |
70 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
71 | ||
944e2948 EB |
72 | static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev, |
73 | struct netdev_queue *txq) | |
74 | { | |
75 | const struct net_device_ops *ops = dev->netdev_ops; | |
76 | int status = NETDEV_TX_OK; | |
77 | netdev_features_t features; | |
78 | ||
79 | features = netif_skb_features(skb); | |
80 | ||
81 | if (vlan_tx_tag_present(skb) && | |
82 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { | |
83 | skb = __vlan_put_tag(skb, skb->vlan_proto, | |
84 | vlan_tx_tag_get(skb)); | |
85 | if (unlikely(!skb)) { | |
86 | /* This is actually a packet drop, but we | |
87 | * don't want the code that calls this | |
88 | * function to try and operate on a NULL skb. | |
89 | */ | |
90 | goto out; | |
91 | } | |
92 | skb->vlan_tci = 0; | |
93 | } | |
94 | ||
95 | status = ops->ndo_start_xmit(skb, dev); | |
96 | if (status == NETDEV_TX_OK) | |
97 | txq_trans_update(txq); | |
98 | ||
99 | out: | |
100 | return status; | |
101 | } | |
102 | ||
c4028958 | 103 | static void queue_process(struct work_struct *work) |
1da177e4 | 104 | { |
4c1ac1b4 DH |
105 | struct netpoll_info *npinfo = |
106 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 107 | struct sk_buff *skb; |
3640543d | 108 | unsigned long flags; |
1da177e4 | 109 | |
6c43ff18 SH |
110 | while ((skb = skb_dequeue(&npinfo->txq))) { |
111 | struct net_device *dev = skb->dev; | |
fd2ea0a7 | 112 | struct netdev_queue *txq; |
1da177e4 | 113 | |
6c43ff18 SH |
114 | if (!netif_device_present(dev) || !netif_running(dev)) { |
115 | __kfree_skb(skb); | |
116 | continue; | |
117 | } | |
1da177e4 | 118 | |
fd2ea0a7 DM |
119 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
120 | ||
3640543d | 121 | local_irq_save(flags); |
fd2ea0a7 | 122 | __netif_tx_lock(txq, smp_processor_id()); |
73466498 | 123 | if (netif_xmit_frozen_or_stopped(txq) || |
944e2948 | 124 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
6c43ff18 | 125 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 126 | __netif_tx_unlock(txq); |
3640543d | 127 | local_irq_restore(flags); |
1da177e4 | 128 | |
25442caf | 129 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
130 | return; |
131 | } | |
fd2ea0a7 | 132 | __netif_tx_unlock(txq); |
3640543d | 133 | local_irq_restore(flags); |
1da177e4 | 134 | } |
1da177e4 LT |
135 | } |
136 | ||
1da177e4 LT |
137 | /* |
138 | * Check whether delayed processing was scheduled for our NIC. If so, | |
139 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
140 | * If this fails, either we've recursed in ->poll() or it's already | |
141 | * running on another CPU. | |
142 | * | |
143 | * Note: we don't mask interrupts with this lock because we're using | |
144 | * trylock here and interrupts are already disabled in the softirq | |
145 | * case. Further, we test the poll_owner to avoid recursion on UP | |
146 | * systems where the lock doesn't exist. | |
1da177e4 | 147 | */ |
b249b51b | 148 | static int poll_one_napi(struct napi_struct *napi, int budget) |
0a7606c1 DM |
149 | { |
150 | int work; | |
151 | ||
152 | /* net_rx_action's ->poll() invocations and our's are | |
153 | * synchronized by this test which is only made while | |
154 | * holding the napi->poll_lock. | |
155 | */ | |
156 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
157 | return budget; | |
158 | ||
7b363e44 | 159 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
160 | |
161 | work = napi->poll(napi, budget); | |
e97dc3fc | 162 | WARN_ONCE(work > budget, "%pF exceeded budget in poll\n", napi->poll); |
7d18f114 | 163 | trace_napi_poll(napi); |
0a7606c1 | 164 | |
7b363e44 | 165 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
166 | |
167 | return budget - work; | |
168 | } | |
169 | ||
9852fbec | 170 | static void poll_napi(struct net_device *dev, int budget) |
1da177e4 | 171 | { |
bea3348e | 172 | struct napi_struct *napi; |
1da177e4 | 173 | |
f13d493d | 174 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 175 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 176 | spin_trylock(&napi->poll_lock)) { |
b249b51b | 177 | budget = poll_one_napi(napi, budget); |
bea3348e SH |
178 | spin_unlock(&napi->poll_lock); |
179 | } | |
1da177e4 LT |
180 | } |
181 | } | |
182 | ||
234b921d | 183 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 184 | { |
5e392739 | 185 | const struct net_device_ops *ops; |
2899656b | 186 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
9c62a68d | 187 | int budget = 0; |
5106930b | 188 | |
ca99ca14 NH |
189 | /* Don't do any rx activity if the dev_lock mutex is held |
190 | * the dev_open/close paths use this to block netpoll activity | |
191 | * while changing device state | |
192 | */ | |
a3dbbc2b | 193 | if (down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
194 | return; |
195 | ||
959d5fde | 196 | if (!netif_running(dev)) { |
bd7c4b60 | 197 | up(&ni->dev_lock); |
5e392739 | 198 | return; |
959d5fde | 199 | } |
5e392739 PE |
200 | |
201 | ops = dev->netdev_ops; | |
959d5fde | 202 | if (!ops->ndo_poll_controller) { |
bd7c4b60 | 203 | up(&ni->dev_lock); |
1da177e4 | 204 | return; |
959d5fde | 205 | } |
1da177e4 LT |
206 | |
207 | /* Process pending work on NIC */ | |
d314774c | 208 | ops->ndo_poll_controller(dev); |
5106930b | 209 | |
9852fbec | 210 | poll_napi(dev, budget); |
1da177e4 | 211 | |
bd7c4b60 | 212 | up(&ni->dev_lock); |
ca99ca14 | 213 | |
3578b0c8 | 214 | zap_completion_queue(); |
1da177e4 LT |
215 | } |
216 | ||
da6e378b | 217 | void netpoll_rx_disable(struct net_device *dev) |
ca99ca14 NH |
218 | { |
219 | struct netpoll_info *ni; | |
220 | int idx; | |
221 | might_sleep(); | |
222 | idx = srcu_read_lock(&netpoll_srcu); | |
223 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
224 | if (ni) | |
bd7c4b60 | 225 | down(&ni->dev_lock); |
ca99ca14 | 226 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 NH |
227 | } |
228 | EXPORT_SYMBOL(netpoll_rx_disable); | |
229 | ||
230 | void netpoll_rx_enable(struct net_device *dev) | |
231 | { | |
232 | struct netpoll_info *ni; | |
233 | rcu_read_lock(); | |
234 | ni = rcu_dereference(dev->npinfo); | |
235 | if (ni) | |
bd7c4b60 | 236 | up(&ni->dev_lock); |
ca99ca14 NH |
237 | rcu_read_unlock(); |
238 | } | |
239 | EXPORT_SYMBOL(netpoll_rx_enable); | |
240 | ||
1da177e4 LT |
241 | static void refill_skbs(void) |
242 | { | |
243 | struct sk_buff *skb; | |
244 | unsigned long flags; | |
245 | ||
a1bcfacd SH |
246 | spin_lock_irqsave(&skb_pool.lock, flags); |
247 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
248 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
249 | if (!skb) | |
250 | break; | |
251 | ||
a1bcfacd | 252 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 253 | } |
a1bcfacd | 254 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
255 | } |
256 | ||
3578b0c8 DM |
257 | static void zap_completion_queue(void) |
258 | { | |
259 | unsigned long flags; | |
260 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
261 | ||
262 | if (sd->completion_queue) { | |
263 | struct sk_buff *clist; | |
264 | ||
265 | local_irq_save(flags); | |
266 | clist = sd->completion_queue; | |
267 | sd->completion_queue = NULL; | |
268 | local_irq_restore(flags); | |
269 | ||
270 | while (clist != NULL) { | |
271 | struct sk_buff *skb = clist; | |
272 | clist = clist->next; | |
273 | if (skb->destructor) { | |
274 | atomic_inc(&skb->users); | |
275 | dev_kfree_skb_any(skb); /* put this one back */ | |
276 | } else { | |
277 | __kfree_skb(skb); | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | put_cpu_var(softnet_data); | |
283 | } | |
284 | ||
a1bcfacd | 285 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 286 | { |
a1bcfacd SH |
287 | int count = 0; |
288 | struct sk_buff *skb; | |
1da177e4 | 289 | |
3578b0c8 | 290 | zap_completion_queue(); |
a1bcfacd | 291 | refill_skbs(); |
1da177e4 | 292 | repeat: |
1da177e4 LT |
293 | |
294 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
295 | if (!skb) |
296 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
297 | |
298 | if (!skb) { | |
a1bcfacd | 299 | if (++count < 10) { |
2a49e001 | 300 | netpoll_poll_dev(np->dev); |
a1bcfacd | 301 | goto repeat; |
1da177e4 | 302 | } |
a1bcfacd | 303 | return NULL; |
1da177e4 LT |
304 | } |
305 | ||
306 | atomic_set(&skb->users, 1); | |
307 | skb_reserve(skb, reserve); | |
308 | return skb; | |
309 | } | |
310 | ||
bea3348e SH |
311 | static int netpoll_owner_active(struct net_device *dev) |
312 | { | |
313 | struct napi_struct *napi; | |
314 | ||
315 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
316 | if (napi->poll_owner == smp_processor_id()) | |
317 | return 1; | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
2899656b | 322 | /* call with IRQ disabled */ |
c2355e1a NH |
323 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
324 | struct net_device *dev) | |
1da177e4 | 325 | { |
2bdfe0ba SH |
326 | int status = NETDEV_TX_BUSY; |
327 | unsigned long tries; | |
de85d99e | 328 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 329 | struct netpoll_info *npinfo; |
2bdfe0ba | 330 | |
2899656b AW |
331 | WARN_ON_ONCE(!irqs_disabled()); |
332 | ||
333 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb YH |
334 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
335 | __kfree_skb(skb); | |
336 | return; | |
337 | } | |
2bdfe0ba SH |
338 | |
339 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 340 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 341 | struct netdev_queue *txq; |
a49f99ff | 342 | |
f663dd9a | 343 | txq = netdev_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 344 | |
0db3dc73 SH |
345 | /* try until next clock tick */ |
346 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
347 | tries > 0; --tries) { | |
fd2ea0a7 | 348 | if (__netif_tx_trylock(txq)) { |
944e2948 EB |
349 | if (!netif_xmit_stopped(txq)) |
350 | status = netpoll_start_xmit(skb, dev, txq); | |
351 | ||
fd2ea0a7 | 352 | __netif_tx_unlock(txq); |
e37b8d93 AM |
353 | |
354 | if (status == NETDEV_TX_OK) | |
355 | break; | |
356 | ||
e37b8d93 | 357 | } |
0db3dc73 SH |
358 | |
359 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 360 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
361 | |
362 | udelay(USEC_PER_POLL); | |
0db1d6fc | 363 | } |
79b1bee8 DD |
364 | |
365 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 366 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
944e2948 | 367 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 368 | |
1da177e4 | 369 | } |
1da177e4 | 370 | |
2bdfe0ba | 371 | if (status != NETDEV_TX_OK) { |
5de4a473 | 372 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 373 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 374 | } |
1da177e4 | 375 | } |
c2355e1a | 376 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
377 | |
378 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
379 | { | |
954fba02 | 380 | int total_len, ip_len, udp_len; |
1da177e4 LT |
381 | struct sk_buff *skb; |
382 | struct udphdr *udph; | |
383 | struct iphdr *iph; | |
384 | struct ethhdr *eth; | |
ee130409 | 385 | static atomic_t ip_ident; |
b3d936f3 | 386 | struct ipv6hdr *ip6h; |
1da177e4 LT |
387 | |
388 | udp_len = len + sizeof(*udph); | |
b3d936f3 CW |
389 | if (np->ipv6) |
390 | ip_len = udp_len + sizeof(*ip6h); | |
391 | else | |
b7394d24 CW |
392 | ip_len = udp_len + sizeof(*iph); |
393 | ||
954fba02 | 394 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 395 | |
954fba02 ED |
396 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
397 | total_len - len); | |
1da177e4 LT |
398 | if (!skb) |
399 | return; | |
400 | ||
27d7ff46 | 401 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 402 | skb_put(skb, len); |
1da177e4 | 403 | |
4bedb452 ACM |
404 | skb_push(skb, sizeof(*udph)); |
405 | skb_reset_transport_header(skb); | |
406 | udph = udp_hdr(skb); | |
1da177e4 LT |
407 | udph->source = htons(np->local_port); |
408 | udph->dest = htons(np->remote_port); | |
409 | udph->len = htons(udp_len); | |
b7394d24 | 410 | |
b3d936f3 CW |
411 | if (np->ipv6) { |
412 | udph->check = 0; | |
413 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
414 | &np->remote_ip.in6, | |
415 | udp_len, IPPROTO_UDP, | |
416 | csum_partial(udph, udp_len, 0)); | |
417 | if (udph->check == 0) | |
418 | udph->check = CSUM_MANGLED_0; | |
419 | ||
420 | skb_push(skb, sizeof(*ip6h)); | |
421 | skb_reset_network_header(skb); | |
422 | ip6h = ipv6_hdr(skb); | |
423 | ||
424 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
425 | put_unaligned(0x60, (unsigned char *)ip6h); | |
426 | ip6h->flow_lbl[0] = 0; | |
427 | ip6h->flow_lbl[1] = 0; | |
428 | ip6h->flow_lbl[2] = 0; | |
429 | ||
430 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
431 | ip6h->nexthdr = IPPROTO_UDP; | |
432 | ip6h->hop_limit = 32; | |
433 | ip6h->saddr = np->local_ip.in6; | |
434 | ip6h->daddr = np->remote_ip.in6; | |
435 | ||
436 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
437 | skb_reset_mac_header(skb); | |
438 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
439 | } else { | |
b7394d24 CW |
440 | udph->check = 0; |
441 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
442 | np->remote_ip.ip, | |
443 | udp_len, IPPROTO_UDP, | |
444 | csum_partial(udph, udp_len, 0)); | |
445 | if (udph->check == 0) | |
446 | udph->check = CSUM_MANGLED_0; | |
447 | ||
448 | skb_push(skb, sizeof(*iph)); | |
449 | skb_reset_network_header(skb); | |
450 | iph = ip_hdr(skb); | |
451 | ||
452 | /* iph->version = 4; iph->ihl = 5; */ | |
453 | put_unaligned(0x45, (unsigned char *)iph); | |
454 | iph->tos = 0; | |
455 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
456 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
457 | iph->frag_off = 0; | |
458 | iph->ttl = 64; | |
459 | iph->protocol = IPPROTO_UDP; | |
460 | iph->check = 0; | |
461 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
462 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
463 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
464 | ||
465 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
466 | skb_reset_mac_header(skb); | |
467 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
468 | } | |
469 | ||
c62326ab JP |
470 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
471 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
472 | |
473 | skb->dev = np->dev; | |
474 | ||
475 | netpoll_send_skb(np, skb); | |
476 | } | |
9e34a5b5 | 477 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 478 | |
0bcc1816 SS |
479 | void netpoll_print_options(struct netpoll *np) |
480 | { | |
e6ec2693 | 481 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
482 | if (np->ipv6) |
483 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
484 | else | |
b7394d24 | 485 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
486 | np_info(np, "interface '%s'\n", np->dev_name); |
487 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
488 | if (np->ipv6) |
489 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
490 | else | |
b7394d24 | 491 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 492 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 493 | } |
9e34a5b5 | 494 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 495 | |
b7394d24 CW |
496 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
497 | { | |
498 | const char *end; | |
499 | ||
500 | if (!strchr(str, ':') && | |
501 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
502 | if (!*end) | |
503 | return 0; | |
504 | } | |
505 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
506 | #if IS_ENABLED(CONFIG_IPV6) | |
507 | if (!*end) | |
508 | return 1; | |
509 | #else | |
510 | return -1; | |
511 | #endif | |
512 | } | |
513 | return -1; | |
514 | } | |
515 | ||
1da177e4 LT |
516 | int netpoll_parse_options(struct netpoll *np, char *opt) |
517 | { | |
518 | char *cur=opt, *delim; | |
b7394d24 | 519 | int ipv6; |
00fe11b3 | 520 | bool ipversion_set = false; |
1da177e4 | 521 | |
c68b9070 | 522 | if (*cur != '@') { |
1da177e4 LT |
523 | if ((delim = strchr(cur, '@')) == NULL) |
524 | goto parse_failed; | |
c68b9070 | 525 | *delim = 0; |
4b5511eb AP |
526 | if (kstrtou16(cur, 10, &np->local_port)) |
527 | goto parse_failed; | |
c68b9070 | 528 | cur = delim; |
1da177e4 LT |
529 | } |
530 | cur++; | |
1da177e4 | 531 | |
c68b9070 | 532 | if (*cur != '/') { |
00fe11b3 | 533 | ipversion_set = true; |
1da177e4 LT |
534 | if ((delim = strchr(cur, '/')) == NULL) |
535 | goto parse_failed; | |
c68b9070 | 536 | *delim = 0; |
b7394d24 CW |
537 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
538 | if (ipv6 < 0) | |
539 | goto parse_failed; | |
540 | else | |
541 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 542 | cur = delim; |
1da177e4 LT |
543 | } |
544 | cur++; | |
545 | ||
c68b9070 | 546 | if (*cur != ',') { |
1da177e4 LT |
547 | /* parse out dev name */ |
548 | if ((delim = strchr(cur, ',')) == NULL) | |
549 | goto parse_failed; | |
c68b9070 | 550 | *delim = 0; |
1da177e4 | 551 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 552 | cur = delim; |
1da177e4 LT |
553 | } |
554 | cur++; | |
555 | ||
c68b9070 | 556 | if (*cur != '@') { |
1da177e4 LT |
557 | /* dst port */ |
558 | if ((delim = strchr(cur, '@')) == NULL) | |
559 | goto parse_failed; | |
c68b9070 | 560 | *delim = 0; |
5fc05f87 | 561 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 562 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
563 | if (kstrtou16(cur, 10, &np->remote_port)) |
564 | goto parse_failed; | |
c68b9070 | 565 | cur = delim; |
1da177e4 LT |
566 | } |
567 | cur++; | |
1da177e4 LT |
568 | |
569 | /* dst ip */ | |
570 | if ((delim = strchr(cur, '/')) == NULL) | |
571 | goto parse_failed; | |
c68b9070 | 572 | *delim = 0; |
b7394d24 CW |
573 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
574 | if (ipv6 < 0) | |
575 | goto parse_failed; | |
00fe11b3 | 576 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
577 | goto parse_failed; |
578 | else | |
579 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 580 | cur = delim + 1; |
1da177e4 | 581 | |
c68b9070 | 582 | if (*cur != 0) { |
1da177e4 | 583 | /* MAC address */ |
4940fc88 | 584 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 585 | goto parse_failed; |
1da177e4 LT |
586 | } |
587 | ||
0bcc1816 | 588 | netpoll_print_options(np); |
1da177e4 LT |
589 | |
590 | return 0; | |
591 | ||
592 | parse_failed: | |
e6ec2693 | 593 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
594 | return -1; |
595 | } | |
9e34a5b5 | 596 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 597 | |
a8779ec1 | 598 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 599 | { |
115c1d6e | 600 | struct netpoll_info *npinfo; |
4247e161 | 601 | const struct net_device_ops *ops; |
b41848b6 | 602 | int err; |
1da177e4 | 603 | |
30fdd8a0 JP |
604 | np->dev = ndev; |
605 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); | |
2cde6acd | 606 | INIT_WORK(&np->cleanup_work, netpoll_async_cleanup); |
30fdd8a0 | 607 | |
8fdd95ec HX |
608 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
609 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
610 | np_err(np, "%s doesn't support polling, aborting\n", |
611 | np->dev_name); | |
8fdd95ec HX |
612 | err = -ENOTSUPP; |
613 | goto out; | |
614 | } | |
615 | ||
616 | if (!ndev->npinfo) { | |
a8779ec1 | 617 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
618 | if (!npinfo) { |
619 | err = -ENOMEM; | |
620 | goto out; | |
621 | } | |
622 | ||
bd7c4b60 | 623 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
624 | skb_queue_head_init(&npinfo->txq); |
625 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
626 | ||
627 | atomic_set(&npinfo->refcnt, 1); | |
628 | ||
629 | ops = np->dev->netdev_ops; | |
630 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 631 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
632 | if (err) |
633 | goto free_npinfo; | |
634 | } | |
635 | } else { | |
0790bbb6 | 636 | npinfo = rtnl_dereference(ndev->npinfo); |
8fdd95ec HX |
637 | atomic_inc(&npinfo->refcnt); |
638 | } | |
639 | ||
640 | npinfo->netpoll = np; | |
641 | ||
8fdd95ec | 642 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 643 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
644 | |
645 | return 0; | |
646 | ||
647 | free_npinfo: | |
648 | kfree(npinfo); | |
649 | out: | |
650 | return err; | |
651 | } | |
652 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
653 | ||
654 | int netpoll_setup(struct netpoll *np) | |
655 | { | |
656 | struct net_device *ndev = NULL; | |
657 | struct in_device *in_dev; | |
658 | int err; | |
659 | ||
f92d3180 | 660 | rtnl_lock(); |
556e6256 CW |
661 | if (np->dev_name) { |
662 | struct net *net = current->nsproxy->net_ns; | |
663 | ndev = __dev_get_by_name(net, np->dev_name); | |
664 | } | |
1da177e4 | 665 | if (!ndev) { |
e6ec2693 | 666 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
667 | err = -ENODEV; |
668 | goto unlock; | |
1da177e4 | 669 | } |
5bd30d39 | 670 | dev_hold(ndev); |
1da177e4 | 671 | |
49bd8fb0 | 672 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 673 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
674 | err = -EBUSY; |
675 | goto put; | |
0c1ad04a WC |
676 | } |
677 | ||
1da177e4 LT |
678 | if (!netif_running(ndev)) { |
679 | unsigned long atmost, atleast; | |
680 | ||
e6ec2693 | 681 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 682 | |
b41848b6 | 683 | err = dev_open(ndev); |
b41848b6 SH |
684 | |
685 | if (err) { | |
e6ec2693 | 686 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 687 | goto put; |
1da177e4 | 688 | } |
1da177e4 | 689 | |
f92d3180 | 690 | rtnl_unlock(); |
1da177e4 | 691 | atleast = jiffies + HZ/10; |
bff38771 | 692 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
693 | while (!netif_carrier_ok(ndev)) { |
694 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 695 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
696 | break; |
697 | } | |
1b614fb9 | 698 | msleep(1); |
1da177e4 LT |
699 | } |
700 | ||
701 | /* If carrier appears to come up instantly, we don't | |
702 | * trust it and pause so that we don't pump all our | |
703 | * queued console messages into the bitbucket. | |
704 | */ | |
705 | ||
706 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 707 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
708 | msleep(4000); |
709 | } | |
f92d3180 | 710 | rtnl_lock(); |
1da177e4 LT |
711 | } |
712 | ||
b7394d24 CW |
713 | if (!np->local_ip.ip) { |
714 | if (!np->ipv6) { | |
f92d3180 | 715 | in_dev = __in_dev_get_rtnl(ndev); |
b7394d24 CW |
716 | |
717 | if (!in_dev || !in_dev->ifa_list) { | |
b7394d24 CW |
718 | np_err(np, "no IP address for %s, aborting\n", |
719 | np->dev_name); | |
720 | err = -EDESTADDRREQ; | |
721 | goto put; | |
722 | } | |
723 | ||
724 | np->local_ip.ip = in_dev->ifa_list->ifa_local; | |
b7394d24 | 725 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
726 | } else { |
727 | #if IS_ENABLED(CONFIG_IPV6) | |
728 | struct inet6_dev *idev; | |
729 | ||
730 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
731 | idev = __in6_dev_get(ndev); |
732 | if (idev) { | |
733 | struct inet6_ifaddr *ifp; | |
734 | ||
735 | read_lock_bh(&idev->lock); | |
736 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
737 | if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) | |
738 | continue; | |
739 | np->local_ip.in6 = ifp->addr; | |
740 | err = 0; | |
741 | break; | |
742 | } | |
743 | read_unlock_bh(&idev->lock); | |
744 | } | |
b3d936f3 CW |
745 | if (err) { |
746 | np_err(np, "no IPv6 address for %s, aborting\n", | |
747 | np->dev_name); | |
748 | goto put; | |
749 | } else | |
750 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
751 | #else | |
752 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
753 | np->dev_name); | |
e39363a9 | 754 | err = -EINVAL; |
b3d936f3 CW |
755 | goto put; |
756 | #endif | |
1da177e4 | 757 | } |
1da177e4 LT |
758 | } |
759 | ||
dbaa1541 HX |
760 | /* fill up the skb queue */ |
761 | refill_skbs(); | |
762 | ||
a8779ec1 | 763 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
764 | if (err) |
765 | goto put; | |
766 | ||
f92d3180 | 767 | rtnl_unlock(); |
1da177e4 LT |
768 | return 0; |
769 | ||
21edbb22 | 770 | put: |
1da177e4 | 771 | dev_put(ndev); |
f92d3180 CW |
772 | unlock: |
773 | rtnl_unlock(); | |
b41848b6 | 774 | return err; |
1da177e4 | 775 | } |
9e34a5b5 | 776 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 777 | |
c68b9070 DM |
778 | static int __init netpoll_init(void) |
779 | { | |
a1bcfacd SH |
780 | skb_queue_head_init(&skb_pool); |
781 | return 0; | |
782 | } | |
783 | core_initcall(netpoll_init); | |
784 | ||
38e6bc18 AW |
785 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
786 | { | |
787 | struct netpoll_info *npinfo = | |
788 | container_of(rcu_head, struct netpoll_info, rcu); | |
789 | ||
38e6bc18 AW |
790 | skb_queue_purge(&npinfo->txq); |
791 | ||
792 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
793 | cancel_delayed_work(&npinfo->tx_work); | |
794 | ||
795 | /* clean after last, unfinished work */ | |
796 | __skb_queue_purge(&npinfo->txq); | |
797 | /* now cancel it again */ | |
798 | cancel_delayed_work(&npinfo->tx_work); | |
799 | kfree(npinfo); | |
800 | } | |
801 | ||
8fdd95ec | 802 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 803 | { |
fbeec2e1 | 804 | struct netpoll_info *npinfo; |
fbeec2e1 | 805 | |
0790bbb6 NH |
806 | /* rtnl_dereference would be preferable here but |
807 | * rcu_cleanup_netpoll path can put us in here safely without | |
808 | * holding the rtnl, so plain rcu_dereference it is | |
809 | */ | |
810 | npinfo = rtnl_dereference(np->dev->npinfo); | |
8fdd95ec | 811 | if (!npinfo) |
dbaa1541 | 812 | return; |
93ec2c72 | 813 | |
ca99ca14 NH |
814 | synchronize_srcu(&netpoll_srcu); |
815 | ||
8fdd95ec HX |
816 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
817 | const struct net_device_ops *ops; | |
de85d99e | 818 | |
8fdd95ec HX |
819 | ops = np->dev->netdev_ops; |
820 | if (ops->ndo_netpoll_cleanup) | |
821 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 822 | |
fcb144b5 | 823 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
38e6bc18 AW |
824 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
825 | } | |
826 | } | |
827 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 828 | |
2cde6acd | 829 | static void netpoll_async_cleanup(struct work_struct *work) |
38e6bc18 | 830 | { |
2cde6acd | 831 | struct netpoll *np = container_of(work, struct netpoll, cleanup_work); |
93ec2c72 | 832 | |
2cde6acd | 833 | rtnl_lock(); |
38e6bc18 | 834 | __netpoll_cleanup(np); |
2cde6acd | 835 | rtnl_unlock(); |
38e6bc18 AW |
836 | kfree(np); |
837 | } | |
93ec2c72 | 838 | |
2cde6acd | 839 | void __netpoll_free_async(struct netpoll *np) |
38e6bc18 | 840 | { |
2cde6acd | 841 | schedule_work(&np->cleanup_work); |
8fdd95ec | 842 | } |
2cde6acd | 843 | EXPORT_SYMBOL_GPL(__netpoll_free_async); |
fbeec2e1 | 844 | |
8fdd95ec HX |
845 | void netpoll_cleanup(struct netpoll *np) |
846 | { | |
8fdd95ec | 847 | rtnl_lock(); |
d0fe8c88 NA |
848 | if (!np->dev) |
849 | goto out; | |
8fdd95ec | 850 | __netpoll_cleanup(np); |
8fdd95ec | 851 | dev_put(np->dev); |
1da177e4 | 852 | np->dev = NULL; |
d0fe8c88 NA |
853 | out: |
854 | rtnl_unlock(); | |
1da177e4 | 855 | } |
9e34a5b5 | 856 | EXPORT_SYMBOL(netpoll_cleanup); |