2 * Common framework for low-level network console, dump, and debugger code
4 * Sep 8 2003 Matt Mackall <mpm@selenic.com>
6 * based on the netconsole code from:
8 * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
9 * Copyright (C) 2002 Red Hat, Inc.
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 <linux/slab.h>
28 #include <asm/unaligned.h>
29 #include <trace/events/napi.h>
32 * We maintain a small pool of fully-sized skbs, to make sure the
33 * message gets out even in extreme OOM situations.
36 #define MAX_UDP_CHUNK 1460
38 #define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
40 static struct sk_buff_head skb_pool
;
42 static atomic_t trapped
;
44 #define USEC_PER_POLL 50
45 #define NETPOLL_RX_ENABLED 1
46 #define NETPOLL_RX_DROP 2
48 #define MAX_SKB_SIZE \
49 (MAX_UDP_CHUNK + sizeof(struct udphdr) + \
50 sizeof(struct iphdr) + sizeof(struct ethhdr))
52 static void arp_reply(struct sk_buff
*skb
);
54 static unsigned int carrier_timeout
= 4;
55 module_param(carrier_timeout
, uint
, 0644);
57 static void queue_process(struct work_struct
*work
)
59 struct netpoll_info
*npinfo
=
60 container_of(work
, struct netpoll_info
, tx_work
.work
);
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
;
69 if (!netif_device_present(dev
) || !netif_running(dev
)) {
74 txq
= netdev_get_tx_queue(dev
, skb_get_queue_mapping(skb
));
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
);
85 schedule_delayed_work(&npinfo
->tx_work
, HZ
/10);
88 __netif_tx_unlock(txq
);
89 local_irq_restore(flags
);
93 static __sum16
checksum_udp(struct sk_buff
*skb
, struct udphdr
*uh
,
94 unsigned short ulen
, __be32 saddr
, __be32 daddr
)
98 if (uh
->check
== 0 || skb_csum_unnecessary(skb
))
101 psum
= csum_tcpudp_nofold(saddr
, daddr
, ulen
, IPPROTO_UDP
, 0);
103 if (skb
->ip_summed
== CHECKSUM_COMPLETE
&&
104 !csum_fold(csum_add(psum
, skb
->csum
)))
109 return __skb_checksum_complete(skb
);
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.
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.
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.
128 static int poll_one_napi(struct netpoll_info
*npinfo
,
129 struct napi_struct
*napi
, int budget
)
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.
137 if (!test_bit(NAPI_STATE_SCHED
, &napi
->state
))
140 npinfo
->rx_flags
|= NETPOLL_RX_DROP
;
141 atomic_inc(&trapped
);
142 set_bit(NAPI_STATE_NPSVC
, &napi
->state
);
144 work
= napi
->poll(napi
, budget
);
145 trace_napi_poll(napi
);
147 clear_bit(NAPI_STATE_NPSVC
, &napi
->state
);
148 atomic_dec(&trapped
);
149 npinfo
->rx_flags
&= ~NETPOLL_RX_DROP
;
151 return budget
- work
;
154 static void poll_napi(struct net_device
*dev
)
156 struct napi_struct
*napi
;
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
);
171 static void service_arp_queue(struct netpoll_info
*npi
)
176 while ((skb
= skb_dequeue(&npi
->arp_tx
)))
181 void netpoll_poll_dev(struct net_device
*dev
)
183 const struct net_device_ops
*ops
;
185 if (!dev
|| !netif_running(dev
))
188 ops
= dev
->netdev_ops
;
189 if (!ops
->ndo_poll_controller
)
192 /* Process pending work on NIC */
193 ops
->ndo_poll_controller(dev
);
197 service_arp_queue(dev
->npinfo
);
201 void netpoll_poll(struct netpoll
*np
)
203 netpoll_poll_dev(np
->dev
);
206 static void refill_skbs(void)
211 spin_lock_irqsave(&skb_pool
.lock
, flags
);
212 while (skb_pool
.qlen
< MAX_SKBS
) {
213 skb
= alloc_skb(MAX_SKB_SIZE
, GFP_ATOMIC
);
217 __skb_queue_tail(&skb_pool
, skb
);
219 spin_unlock_irqrestore(&skb_pool
.lock
, flags
);
222 static struct sk_buff
*find_skb(struct netpoll
*np
, int len
, int reserve
)
230 skb
= alloc_skb(len
, GFP_ATOMIC
);
232 skb
= skb_dequeue(&skb_pool
);
242 atomic_set(&skb
->users
, 1);
243 skb_reserve(skb
, reserve
);
247 static int netpoll_owner_active(struct net_device
*dev
)
249 struct napi_struct
*napi
;
251 list_for_each_entry(napi
, &dev
->napi_list
, dev_list
) {
252 if (napi
->poll_owner
== smp_processor_id())
258 void netpoll_send_skb(struct netpoll
*np
, struct sk_buff
*skb
)
260 int status
= NETDEV_TX_BUSY
;
262 struct net_device
*dev
= np
->dev
;
263 const struct net_device_ops
*ops
= dev
->netdev_ops
;
264 struct netpoll_info
*npinfo
= np
->dev
->npinfo
;
266 if (!npinfo
|| !netif_running(dev
) || !netif_device_present(dev
)) {
271 /* don't get messages out of order, and no recursion */
272 if (skb_queue_len(&npinfo
->txq
) == 0 && !netpoll_owner_active(dev
)) {
273 struct netdev_queue
*txq
;
276 txq
= netdev_get_tx_queue(dev
, skb_get_queue_mapping(skb
));
278 local_irq_save(flags
);
279 /* try until next clock tick */
280 for (tries
= jiffies_to_usecs(1)/USEC_PER_POLL
;
281 tries
> 0; --tries
) {
282 if (__netif_tx_trylock(txq
)) {
283 if (!netif_tx_queue_stopped(txq
)) {
284 dev
->priv_flags
|= IFF_IN_NETPOLL
;
285 status
= ops
->ndo_start_xmit(skb
, dev
);
286 dev
->priv_flags
&= ~IFF_IN_NETPOLL
;
287 if (status
== NETDEV_TX_OK
)
288 txq_trans_update(txq
);
290 __netif_tx_unlock(txq
);
292 if (status
== NETDEV_TX_OK
)
297 /* tickle device maybe there is some cleanup */
300 udelay(USEC_PER_POLL
);
303 WARN_ONCE(!irqs_disabled(),
304 "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n",
305 dev
->name
, ops
->ndo_start_xmit
);
307 local_irq_restore(flags
);
310 if (status
!= NETDEV_TX_OK
) {
311 skb_queue_tail(&npinfo
->txq
, skb
);
312 schedule_delayed_work(&npinfo
->tx_work
,0);
316 void netpoll_send_udp(struct netpoll
*np
, const char *msg
, int len
)
318 int total_len
, eth_len
, ip_len
, udp_len
;
324 udp_len
= len
+ sizeof(*udph
);
325 ip_len
= eth_len
= udp_len
+ sizeof(*iph
);
326 total_len
= eth_len
+ ETH_HLEN
+ NET_IP_ALIGN
;
328 skb
= find_skb(np
, total_len
, total_len
- len
);
332 skb_copy_to_linear_data(skb
, msg
, len
);
335 skb_push(skb
, sizeof(*udph
));
336 skb_reset_transport_header(skb
);
338 udph
->source
= htons(np
->local_port
);
339 udph
->dest
= htons(np
->remote_port
);
340 udph
->len
= htons(udp_len
);
342 udph
->check
= csum_tcpudp_magic(np
->local_ip
,
344 udp_len
, IPPROTO_UDP
,
345 csum_partial(udph
, udp_len
, 0));
346 if (udph
->check
== 0)
347 udph
->check
= CSUM_MANGLED_0
;
349 skb_push(skb
, sizeof(*iph
));
350 skb_reset_network_header(skb
);
353 /* iph->version = 4; iph->ihl = 5; */
354 put_unaligned(0x45, (unsigned char *)iph
);
356 put_unaligned(htons(ip_len
), &(iph
->tot_len
));
360 iph
->protocol
= IPPROTO_UDP
;
362 put_unaligned(np
->local_ip
, &(iph
->saddr
));
363 put_unaligned(np
->remote_ip
, &(iph
->daddr
));
364 iph
->check
= ip_fast_csum((unsigned char *)iph
, iph
->ihl
);
366 eth
= (struct ethhdr
*) skb_push(skb
, ETH_HLEN
);
367 skb_reset_mac_header(skb
);
368 skb
->protocol
= eth
->h_proto
= htons(ETH_P_IP
);
369 memcpy(eth
->h_source
, np
->dev
->dev_addr
, ETH_ALEN
);
370 memcpy(eth
->h_dest
, np
->remote_mac
, ETH_ALEN
);
374 netpoll_send_skb(np
, skb
);
377 static void arp_reply(struct sk_buff
*skb
)
379 struct netpoll_info
*npinfo
= skb
->dev
->npinfo
;
381 unsigned char *arp_ptr
;
382 int size
, type
= ARPOP_REPLY
, ptype
= ETH_P_ARP
;
385 struct sk_buff
*send_skb
;
386 struct netpoll
*np
, *tmp
;
390 if (list_empty(&npinfo
->rx_np
))
393 /* Before checking the packet, we do some early
394 inspection whether this is interesting at all */
395 spin_lock_irqsave(&npinfo
->rx_lock
, flags
);
396 list_for_each_entry_safe(np
, tmp
, &npinfo
->rx_np
, rx
) {
397 if (np
->dev
== skb
->dev
)
400 spin_unlock_irqrestore(&npinfo
->rx_lock
, flags
);
402 /* No netpoll struct is using this dev */
406 /* No arp on this interface */
407 if (skb
->dev
->flags
& IFF_NOARP
)
410 if (!pskb_may_pull(skb
, arp_hdr_len(skb
->dev
)))
413 skb_reset_network_header(skb
);
414 skb_reset_transport_header(skb
);
417 if ((arp
->ar_hrd
!= htons(ARPHRD_ETHER
) &&
418 arp
->ar_hrd
!= htons(ARPHRD_IEEE802
)) ||
419 arp
->ar_pro
!= htons(ETH_P_IP
) ||
420 arp
->ar_op
!= htons(ARPOP_REQUEST
))
423 arp_ptr
= (unsigned char *)(arp
+1);
424 /* save the location of the src hw addr */
426 arp_ptr
+= skb
->dev
->addr_len
;
427 memcpy(&sip
, arp_ptr
, 4);
429 /* If we actually cared about dst hw addr,
430 it would get copied here */
431 arp_ptr
+= skb
->dev
->addr_len
;
432 memcpy(&tip
, arp_ptr
, 4);
434 /* Should we ignore arp? */
435 if (ipv4_is_loopback(tip
) || ipv4_is_multicast(tip
))
438 size
= arp_hdr_len(skb
->dev
);
440 spin_lock_irqsave(&npinfo
->rx_lock
, flags
);
441 list_for_each_entry_safe(np
, tmp
, &npinfo
->rx_np
, rx
) {
442 if (tip
!= np
->local_ip
)
445 send_skb
= find_skb(np
, size
+ LL_ALLOCATED_SPACE(np
->dev
),
446 LL_RESERVED_SPACE(np
->dev
));
450 skb_reset_network_header(send_skb
);
451 arp
= (struct arphdr
*) skb_put(send_skb
, size
);
452 send_skb
->dev
= skb
->dev
;
453 send_skb
->protocol
= htons(ETH_P_ARP
);
455 /* Fill the device header for the ARP frame */
456 if (dev_hard_header(send_skb
, skb
->dev
, ptype
,
457 sha
, np
->dev
->dev_addr
,
458 send_skb
->len
) < 0) {
464 * Fill out the arp protocol part.
466 * we only support ethernet device type,
467 * which (according to RFC 1390) should
468 * always equal 1 (Ethernet).
471 arp
->ar_hrd
= htons(np
->dev
->type
);
472 arp
->ar_pro
= htons(ETH_P_IP
);
473 arp
->ar_hln
= np
->dev
->addr_len
;
475 arp
->ar_op
= htons(type
);
477 arp_ptr
= (unsigned char *)(arp
+ 1);
478 memcpy(arp_ptr
, np
->dev
->dev_addr
, np
->dev
->addr_len
);
479 arp_ptr
+= np
->dev
->addr_len
;
480 memcpy(arp_ptr
, &tip
, 4);
482 memcpy(arp_ptr
, sha
, np
->dev
->addr_len
);
483 arp_ptr
+= np
->dev
->addr_len
;
484 memcpy(arp_ptr
, &sip
, 4);
486 netpoll_send_skb(np
, send_skb
);
488 /* If there are several rx_hooks for the same address,
489 we're fine by sending a single reply */
492 spin_unlock_irqrestore(&npinfo
->rx_lock
, flags
);
495 int __netpoll_rx(struct sk_buff
*skb
)
497 int proto
, len
, ulen
;
501 struct netpoll_info
*npinfo
= skb
->dev
->npinfo
;
502 struct netpoll
*np
, *tmp
;
504 if (list_empty(&npinfo
->rx_np
))
507 if (skb
->dev
->type
!= ARPHRD_ETHER
)
510 /* check if netpoll clients need ARP */
511 if (skb
->protocol
== htons(ETH_P_ARP
) &&
512 atomic_read(&trapped
)) {
513 skb_queue_tail(&npinfo
->arp_tx
, skb
);
517 proto
= ntohs(eth_hdr(skb
)->h_proto
);
518 if (proto
!= ETH_P_IP
)
520 if (skb
->pkt_type
== PACKET_OTHERHOST
)
525 iph
= (struct iphdr
*)skb
->data
;
526 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
528 if (iph
->ihl
< 5 || iph
->version
!= 4)
530 if (!pskb_may_pull(skb
, iph
->ihl
*4))
532 if (ip_fast_csum((u8
*)iph
, iph
->ihl
) != 0)
535 len
= ntohs(iph
->tot_len
);
536 if (skb
->len
< len
|| len
< iph
->ihl
*4)
540 * Our transport medium may have padded the buffer out.
541 * Now We trim to the true length of the frame.
543 if (pskb_trim_rcsum(skb
, len
))
546 if (iph
->protocol
!= IPPROTO_UDP
)
550 uh
= (struct udphdr
*)(((char *)iph
) + iph
->ihl
*4);
551 ulen
= ntohs(uh
->len
);
555 if (checksum_udp(skb
, uh
, ulen
, iph
->saddr
, iph
->daddr
))
558 list_for_each_entry_safe(np
, tmp
, &npinfo
->rx_np
, rx
) {
559 if (np
->local_ip
&& np
->local_ip
!= iph
->daddr
)
561 if (np
->remote_ip
&& np
->remote_ip
!= iph
->saddr
)
563 if (np
->local_port
&& np
->local_port
!= ntohs(uh
->dest
))
566 np
->rx_hook(np
, ntohs(uh
->source
),
568 ulen
- sizeof(struct udphdr
));
579 if (atomic_read(&trapped
)) {
587 void netpoll_print_options(struct netpoll
*np
)
589 printk(KERN_INFO
"%s: local port %d\n",
590 np
->name
, np
->local_port
);
591 printk(KERN_INFO
"%s: local IP %pI4\n",
592 np
->name
, &np
->local_ip
);
593 printk(KERN_INFO
"%s: interface '%s'\n",
594 np
->name
, np
->dev_name
);
595 printk(KERN_INFO
"%s: remote port %d\n",
596 np
->name
, np
->remote_port
);
597 printk(KERN_INFO
"%s: remote IP %pI4\n",
598 np
->name
, &np
->remote_ip
);
599 printk(KERN_INFO
"%s: remote ethernet address %pM\n",
600 np
->name
, np
->remote_mac
);
603 int netpoll_parse_options(struct netpoll
*np
, char *opt
)
605 char *cur
=opt
, *delim
;
608 if ((delim
= strchr(cur
, '@')) == NULL
)
611 np
->local_port
= simple_strtol(cur
, NULL
, 10);
617 if ((delim
= strchr(cur
, '/')) == NULL
)
620 np
->local_ip
= in_aton(cur
);
626 /* parse out dev name */
627 if ((delim
= strchr(cur
, ',')) == NULL
)
630 strlcpy(np
->dev_name
, cur
, sizeof(np
->dev_name
));
637 if ((delim
= strchr(cur
, '@')) == NULL
)
640 if (*cur
== ' ' || *cur
== '\t')
641 printk(KERN_INFO
"%s: warning: whitespace"
642 "is not allowed\n", np
->name
);
643 np
->remote_port
= simple_strtol(cur
, NULL
, 10);
649 if ((delim
= strchr(cur
, '/')) == NULL
)
652 np
->remote_ip
= in_aton(cur
);
657 if ((delim
= strchr(cur
, ':')) == NULL
)
660 np
->remote_mac
[0] = simple_strtol(cur
, NULL
, 16);
662 if ((delim
= strchr(cur
, ':')) == NULL
)
665 np
->remote_mac
[1] = simple_strtol(cur
, NULL
, 16);
667 if ((delim
= strchr(cur
, ':')) == NULL
)
670 np
->remote_mac
[2] = simple_strtol(cur
, NULL
, 16);
672 if ((delim
= strchr(cur
, ':')) == NULL
)
675 np
->remote_mac
[3] = simple_strtol(cur
, NULL
, 16);
677 if ((delim
= strchr(cur
, ':')) == NULL
)
680 np
->remote_mac
[4] = simple_strtol(cur
, NULL
, 16);
682 np
->remote_mac
[5] = simple_strtol(cur
, NULL
, 16);
685 netpoll_print_options(np
);
690 printk(KERN_INFO
"%s: couldn't parse config at '%s'!\n",
695 int netpoll_setup(struct netpoll
*np
)
697 struct net_device
*ndev
= NULL
;
698 struct in_device
*in_dev
;
699 struct netpoll_info
*npinfo
;
700 struct netpoll
*npe
, *tmp
;
705 ndev
= dev_get_by_name(&init_net
, np
->dev_name
);
707 printk(KERN_ERR
"%s: %s doesn't exist, aborting.\n",
708 np
->name
, np
->dev_name
);
714 npinfo
= kmalloc(sizeof(*npinfo
), GFP_KERNEL
);
720 npinfo
->rx_flags
= 0;
721 INIT_LIST_HEAD(&npinfo
->rx_np
);
723 spin_lock_init(&npinfo
->rx_lock
);
724 skb_queue_head_init(&npinfo
->arp_tx
);
725 skb_queue_head_init(&npinfo
->txq
);
726 INIT_DELAYED_WORK(&npinfo
->tx_work
, queue_process
);
728 atomic_set(&npinfo
->refcnt
, 1);
730 npinfo
= ndev
->npinfo
;
731 atomic_inc(&npinfo
->refcnt
);
734 npinfo
->netpoll
= np
;
736 if ((ndev
->priv_flags
& IFF_DISABLE_NETPOLL
) ||
737 !ndev
->netdev_ops
->ndo_poll_controller
) {
738 printk(KERN_ERR
"%s: %s doesn't support polling, aborting.\n",
739 np
->name
, np
->dev_name
);
744 if (!netif_running(ndev
)) {
745 unsigned long atmost
, atleast
;
747 printk(KERN_INFO
"%s: device %s not up yet, forcing it\n",
748 np
->name
, np
->dev_name
);
751 err
= dev_open(ndev
);
755 printk(KERN_ERR
"%s: failed to open %s\n",
756 np
->name
, ndev
->name
);
760 atleast
= jiffies
+ HZ
/10;
761 atmost
= jiffies
+ carrier_timeout
* HZ
;
762 while (!netif_carrier_ok(ndev
)) {
763 if (time_after(jiffies
, atmost
)) {
765 "%s: timeout waiting for carrier\n",
772 /* If carrier appears to come up instantly, we don't
773 * trust it and pause so that we don't pump all our
774 * queued console messages into the bitbucket.
777 if (time_before(jiffies
, atleast
)) {
778 printk(KERN_NOTICE
"%s: carrier detect appears"
779 " untrustworthy, waiting 4 seconds\n",
787 in_dev
= __in_dev_get_rcu(ndev
);
789 if (!in_dev
|| !in_dev
->ifa_list
) {
791 printk(KERN_ERR
"%s: no IP address for %s, aborting\n",
792 np
->name
, np
->dev_name
);
797 np
->local_ip
= in_dev
->ifa_list
->ifa_local
;
799 printk(KERN_INFO
"%s: local IP %pI4\n", np
->name
, &np
->local_ip
);
803 spin_lock_irqsave(&npinfo
->rx_lock
, flags
);
804 npinfo
->rx_flags
|= NETPOLL_RX_ENABLED
;
805 list_add_tail(&np
->rx
, &npinfo
->rx_np
);
806 spin_unlock_irqrestore(&npinfo
->rx_lock
, flags
);
809 /* fill up the skb queue */
812 /* last thing to do is link it to the net device structure */
813 ndev
->npinfo
= npinfo
;
815 /* avoid racing with NAPI reading npinfo */
822 spin_lock_irqsave(&npinfo
->rx_lock
, flags
);
823 list_for_each_entry_safe(npe
, tmp
, &npinfo
->rx_np
, rx
) {
826 spin_unlock_irqrestore(&npinfo
->rx_lock
, flags
);
835 static int __init
netpoll_init(void)
837 skb_queue_head_init(&skb_pool
);
840 core_initcall(netpoll_init
);
842 void netpoll_cleanup(struct netpoll
*np
)
844 struct netpoll_info
*npinfo
;
848 npinfo
= np
->dev
->npinfo
;
850 if (!list_empty(&npinfo
->rx_np
)) {
851 spin_lock_irqsave(&npinfo
->rx_lock
, flags
);
853 if (list_empty(&npinfo
->rx_np
))
854 npinfo
->rx_flags
&= ~NETPOLL_RX_ENABLED
;
855 spin_unlock_irqrestore(&npinfo
->rx_lock
, flags
);
858 if (atomic_dec_and_test(&npinfo
->refcnt
)) {
859 const struct net_device_ops
*ops
;
860 skb_queue_purge(&npinfo
->arp_tx
);
861 skb_queue_purge(&npinfo
->txq
);
862 cancel_rearming_delayed_work(&npinfo
->tx_work
);
864 /* clean after last, unfinished work */
865 __skb_queue_purge(&npinfo
->txq
);
867 ops
= np
->dev
->netdev_ops
;
868 if (ops
->ndo_netpoll_cleanup
)
869 ops
->ndo_netpoll_cleanup(np
->dev
);
870 np
->dev
->npinfo
= NULL
;
880 int netpoll_trap(void)
882 return atomic_read(&trapped
);
885 void netpoll_set_trap(int trap
)
888 atomic_inc(&trapped
);
890 atomic_dec(&trapped
);
893 EXPORT_SYMBOL(netpoll_send_skb
);
894 EXPORT_SYMBOL(netpoll_set_trap
);
895 EXPORT_SYMBOL(netpoll_trap
);
896 EXPORT_SYMBOL(netpoll_print_options
);
897 EXPORT_SYMBOL(netpoll_parse_options
);
898 EXPORT_SYMBOL(netpoll_setup
);
899 EXPORT_SYMBOL(netpoll_cleanup
);
900 EXPORT_SYMBOL(netpoll_send_udp
);
901 EXPORT_SYMBOL(netpoll_poll_dev
);
902 EXPORT_SYMBOL(netpoll_poll
);
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