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23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/ctype.h>
28#include <linux/ethtool.h>
29#include <linux/workqueue.h>
30#include <linux/mii.h>
31#include <linux/usb.h>
32#include <linux/usb/usbnet.h>
33#include <linux/slab.h>
34#include <linux/kernel.h>
35#include <linux/pm_runtime.h>
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50#define MAX_QUEUE_MEMORY (60 * 1518)
51#define RX_QLEN(dev) ((dev)->rx_qlen)
52#define TX_QLEN(dev) ((dev)->tx_qlen)
53
54
55#define TX_TIMEOUT_JIFFIES (5*HZ)
56
57
58
59
60#define THROTTLE_JIFFIES (HZ/8)
61
62
63#define UNLINK_TIMEOUT_MS 3
64
65
66
67
68static u8 node_id [ETH_ALEN];
69
70
71static int msg_level = -1;
72module_param (msg_level, int, 0);
73MODULE_PARM_DESC (msg_level, "Override default message level");
74
75
76
77static const char * const usbnet_event_names[] = {
78 [EVENT_TX_HALT] = "EVENT_TX_HALT",
79 [EVENT_RX_HALT] = "EVENT_RX_HALT",
80 [EVENT_RX_MEMORY] = "EVENT_RX_MEMORY",
81 [EVENT_STS_SPLIT] = "EVENT_STS_SPLIT",
82 [EVENT_LINK_RESET] = "EVENT_LINK_RESET",
83 [EVENT_RX_PAUSED] = "EVENT_RX_PAUSED",
84 [EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP",
85 [EVENT_DEV_OPEN] = "EVENT_DEV_OPEN",
86 [EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE",
87 [EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM",
88 [EVENT_RX_KILL] = "EVENT_RX_KILL",
89 [EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE",
90 [EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE",
91 [EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN",
92};
93
94
95int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96{
97 int tmp;
98 struct usb_host_interface *alt = NULL;
99 struct usb_host_endpoint *in = NULL, *out = NULL;
100 struct usb_host_endpoint *status = NULL;
101
102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 unsigned ep;
104
105 in = out = status = NULL;
106 alt = intf->altsetting + tmp;
107
108
109
110
111
112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
113 struct usb_host_endpoint *e;
114 int intr = 0;
115
116 e = alt->endpoint + ep;
117
118
119 if (!usb_endpoint_maxp(&e->desc))
120 continue;
121
122 switch (e->desc.bmAttributes) {
123 case USB_ENDPOINT_XFER_INT:
124 if (!usb_endpoint_dir_in(&e->desc))
125 continue;
126 intr = 1;
127 fallthrough;
128 case USB_ENDPOINT_XFER_BULK:
129 break;
130 default:
131 continue;
132 }
133 if (usb_endpoint_dir_in(&e->desc)) {
134 if (!intr && !in)
135 in = e;
136 else if (intr && !status)
137 status = e;
138 } else {
139 if (!out)
140 out = e;
141 }
142 }
143 if (in && out)
144 break;
145 }
146 if (!alt || !in || !out)
147 return -EINVAL;
148
149 if (alt->desc.bAlternateSetting != 0 ||
150 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
151 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
152 alt->desc.bAlternateSetting);
153 if (tmp < 0)
154 return tmp;
155 }
156
157 dev->in = usb_rcvbulkpipe (dev->udev,
158 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
159 dev->out = usb_sndbulkpipe (dev->udev,
160 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
161 dev->status = status;
162 return 0;
163}
164EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
165
166int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
167{
168 int tmp = -1, ret;
169 unsigned char buf [13];
170
171 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
172 if (ret == 12)
173 tmp = hex2bin(dev->net->dev_addr, buf, 6);
174 if (tmp < 0) {
175 dev_dbg(&dev->udev->dev,
176 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
177 if (ret >= 0)
178 ret = -EINVAL;
179 return ret;
180 }
181 return 0;
182}
183EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
184
185static void intr_complete (struct urb *urb)
186{
187 struct usbnet *dev = urb->context;
188 int status = urb->status;
189
190 switch (status) {
191
192 case 0:
193 dev->driver_info->status(dev, urb);
194 break;
195
196
197 case -ENOENT:
198 case -ESHUTDOWN:
199 netif_dbg(dev, ifdown, dev->net,
200 "intr shutdown, code %d\n", status);
201 return;
202
203
204
205
206 default:
207 netdev_dbg(dev->net, "intr status %d\n", status);
208 break;
209 }
210
211 status = usb_submit_urb (urb, GFP_ATOMIC);
212 if (status != 0)
213 netif_err(dev, timer, dev->net,
214 "intr resubmit --> %d\n", status);
215}
216
217static int init_status (struct usbnet *dev, struct usb_interface *intf)
218{
219 char *buf = NULL;
220 unsigned pipe = 0;
221 unsigned maxp;
222 unsigned period;
223
224 if (!dev->driver_info->status)
225 return 0;
226
227 pipe = usb_rcvintpipe (dev->udev,
228 dev->status->desc.bEndpointAddress
229 & USB_ENDPOINT_NUMBER_MASK);
230 maxp = usb_maxpacket (dev->udev, pipe, 0);
231
232
233 period = max ((int) dev->status->desc.bInterval,
234 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
235
236 buf = kmalloc (maxp, GFP_KERNEL);
237 if (buf) {
238 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
239 if (!dev->interrupt) {
240 kfree (buf);
241 return -ENOMEM;
242 } else {
243 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
244 buf, maxp, intr_complete, dev, period);
245 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
246 dev_dbg(&intf->dev,
247 "status ep%din, %d bytes period %d\n",
248 usb_pipeendpoint(pipe), maxp, period);
249 }
250 }
251 return 0;
252}
253
254
255int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
256{
257 int ret = 0;
258
259 WARN_ON_ONCE(dev->interrupt == NULL);
260 if (dev->interrupt) {
261 mutex_lock(&dev->interrupt_mutex);
262
263 if (++dev->interrupt_count == 1)
264 ret = usb_submit_urb(dev->interrupt, mem_flags);
265
266 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
267 dev->interrupt_count);
268 mutex_unlock(&dev->interrupt_mutex);
269 }
270 return ret;
271}
272EXPORT_SYMBOL_GPL(usbnet_status_start);
273
274
275static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
276{
277 int ret = 0;
278
279 mutex_lock(&dev->interrupt_mutex);
280 if (dev->interrupt_count) {
281 ret = usb_submit_urb(dev->interrupt, mem_flags);
282 dev_dbg(&dev->udev->dev,
283 "submitted interrupt URB for resume\n");
284 }
285 mutex_unlock(&dev->interrupt_mutex);
286 return ret;
287}
288
289
290void usbnet_status_stop(struct usbnet *dev)
291{
292 if (dev->interrupt) {
293 mutex_lock(&dev->interrupt_mutex);
294 WARN_ON(dev->interrupt_count == 0);
295
296 if (dev->interrupt_count && --dev->interrupt_count == 0)
297 usb_kill_urb(dev->interrupt);
298
299 dev_dbg(&dev->udev->dev,
300 "decremented interrupt URB count to %d\n",
301 dev->interrupt_count);
302 mutex_unlock(&dev->interrupt_mutex);
303 }
304}
305EXPORT_SYMBOL_GPL(usbnet_status_stop);
306
307
308static void __usbnet_status_stop_force(struct usbnet *dev)
309{
310 if (dev->interrupt) {
311 mutex_lock(&dev->interrupt_mutex);
312 usb_kill_urb(dev->interrupt);
313 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
314 mutex_unlock(&dev->interrupt_mutex);
315 }
316}
317
318
319
320
321
322void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
323{
324 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
325 unsigned long flags;
326 int status;
327
328 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
329 skb_queue_tail(&dev->rxq_pause, skb);
330 return;
331 }
332
333
334 if (skb->protocol == 0)
335 skb->protocol = eth_type_trans (skb, dev->net);
336
337 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
338 stats64->rx_packets++;
339 stats64->rx_bytes += skb->len;
340 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
341
342 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
343 skb->len + sizeof (struct ethhdr), skb->protocol);
344 memset (skb->cb, 0, sizeof (struct skb_data));
345
346 if (skb_defer_rx_timestamp(skb))
347 return;
348
349 status = netif_rx (skb);
350 if (status != NET_RX_SUCCESS)
351 netif_dbg(dev, rx_err, dev->net,
352 "netif_rx status %d\n", status);
353}
354EXPORT_SYMBOL_GPL(usbnet_skb_return);
355
356
357void usbnet_update_max_qlen(struct usbnet *dev)
358{
359 enum usb_device_speed speed = dev->udev->speed;
360
361 if (!dev->rx_urb_size || !dev->hard_mtu)
362 goto insanity;
363 switch (speed) {
364 case USB_SPEED_HIGH:
365 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
366 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
367 break;
368 case USB_SPEED_SUPER:
369 case USB_SPEED_SUPER_PLUS:
370
371
372
373
374
375 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
376 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
377 break;
378 default:
379insanity:
380 dev->rx_qlen = dev->tx_qlen = 4;
381 }
382}
383EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
384
385
386
387
388
389
390
391
392int usbnet_change_mtu (struct net_device *net, int new_mtu)
393{
394 struct usbnet *dev = netdev_priv(net);
395 int ll_mtu = new_mtu + net->hard_header_len;
396 int old_hard_mtu = dev->hard_mtu;
397 int old_rx_urb_size = dev->rx_urb_size;
398
399
400 if ((ll_mtu % dev->maxpacket) == 0)
401 return -EDOM;
402 net->mtu = new_mtu;
403
404 dev->hard_mtu = net->mtu + net->hard_header_len;
405 if (dev->rx_urb_size == old_hard_mtu) {
406 dev->rx_urb_size = dev->hard_mtu;
407 if (dev->rx_urb_size > old_rx_urb_size) {
408 usbnet_pause_rx(dev);
409 usbnet_unlink_rx_urbs(dev);
410 usbnet_resume_rx(dev);
411 }
412 }
413
414
415 usbnet_update_max_qlen(dev);
416
417 return 0;
418}
419EXPORT_SYMBOL_GPL(usbnet_change_mtu);
420
421
422static void __usbnet_queue_skb(struct sk_buff_head *list,
423 struct sk_buff *newsk, enum skb_state state)
424{
425 struct skb_data *entry = (struct skb_data *) newsk->cb;
426
427 __skb_queue_tail(list, newsk);
428 entry->state = state;
429}
430
431
432
433
434
435
436
437static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
438 struct sk_buff_head *list, enum skb_state state)
439{
440 unsigned long flags;
441 enum skb_state old_state;
442 struct skb_data *entry = (struct skb_data *) skb->cb;
443
444 spin_lock_irqsave(&list->lock, flags);
445 old_state = entry->state;
446 entry->state = state;
447 __skb_unlink(skb, list);
448
449
450
451
452
453 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
454
455 __skb_queue_tail(&dev->done, skb);
456 if (dev->done.qlen == 1)
457 tasklet_schedule(&dev->bh);
458 spin_unlock(&dev->done.lock);
459 spin_unlock_irqrestore(&list->lock, flags);
460 return old_state;
461}
462
463
464
465
466
467
468void usbnet_defer_kevent (struct usbnet *dev, int work)
469{
470 set_bit (work, &dev->flags);
471 if (!schedule_work (&dev->kevent))
472 netdev_dbg(dev->net, "kevent %s may have been dropped\n", usbnet_event_names[work]);
473 else
474 netdev_dbg(dev->net, "kevent %s scheduled\n", usbnet_event_names[work]);
475}
476EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
477
478
479
480static void rx_complete (struct urb *urb);
481
482static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
483{
484 struct sk_buff *skb;
485 struct skb_data *entry;
486 int retval = 0;
487 unsigned long lockflags;
488 size_t size = dev->rx_urb_size;
489
490
491 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
492 usb_free_urb(urb);
493 return -ENOLINK;
494 }
495
496 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
497 skb = __netdev_alloc_skb(dev->net, size, flags);
498 else
499 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
500 if (!skb) {
501 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
503 usb_free_urb (urb);
504 return -ENOMEM;
505 }
506
507 entry = (struct skb_data *) skb->cb;
508 entry->urb = urb;
509 entry->dev = dev;
510 entry->length = 0;
511
512 usb_fill_bulk_urb (urb, dev->udev, dev->in,
513 skb->data, size, rx_complete, skb);
514
515 spin_lock_irqsave (&dev->rxq.lock, lockflags);
516
517 if (netif_running (dev->net) &&
518 netif_device_present (dev->net) &&
519 test_bit(EVENT_DEV_OPEN, &dev->flags) &&
520 !test_bit (EVENT_RX_HALT, &dev->flags) &&
521 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
522 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
523 case -EPIPE:
524 usbnet_defer_kevent (dev, EVENT_RX_HALT);
525 break;
526 case -ENOMEM:
527 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
528 break;
529 case -ENODEV:
530 netif_dbg(dev, ifdown, dev->net, "device gone\n");
531 netif_device_detach (dev->net);
532 break;
533 case -EHOSTUNREACH:
534 retval = -ENOLINK;
535 break;
536 default:
537 netif_dbg(dev, rx_err, dev->net,
538 "rx submit, %d\n", retval);
539 tasklet_schedule (&dev->bh);
540 break;
541 case 0:
542 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
543 }
544 } else {
545 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
546 retval = -ENOLINK;
547 }
548 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
549 if (retval) {
550 dev_kfree_skb_any (skb);
551 usb_free_urb (urb);
552 }
553 return retval;
554}
555
556
557
558
559static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
560{
561 if (dev->driver_info->rx_fixup &&
562 !dev->driver_info->rx_fixup (dev, skb)) {
563
564 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
565 dev->net->stats.rx_errors++;
566 goto done;
567 }
568
569
570
571 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
572 goto done;
573
574 if (skb->len < ETH_HLEN) {
575 dev->net->stats.rx_errors++;
576 dev->net->stats.rx_length_errors++;
577 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
578 } else {
579 usbnet_skb_return(dev, skb);
580 return;
581 }
582
583done:
584 skb_queue_tail(&dev->done, skb);
585}
586
587
588
589static void rx_complete (struct urb *urb)
590{
591 struct sk_buff *skb = (struct sk_buff *) urb->context;
592 struct skb_data *entry = (struct skb_data *) skb->cb;
593 struct usbnet *dev = entry->dev;
594 int urb_status = urb->status;
595 enum skb_state state;
596
597 skb_put (skb, urb->actual_length);
598 state = rx_done;
599 entry->urb = NULL;
600
601 switch (urb_status) {
602
603 case 0:
604 break;
605
606
607
608
609
610
611 case -EPIPE:
612 dev->net->stats.rx_errors++;
613 usbnet_defer_kevent (dev, EVENT_RX_HALT);
614 fallthrough;
615
616
617 case -ECONNRESET:
618 case -ESHUTDOWN:
619 netif_dbg(dev, ifdown, dev->net,
620 "rx shutdown, code %d\n", urb_status);
621 goto block;
622
623
624
625
626
627 case -EPROTO:
628 case -ETIME:
629 case -EILSEQ:
630 dev->net->stats.rx_errors++;
631 if (!timer_pending (&dev->delay)) {
632 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
633 netif_dbg(dev, link, dev->net,
634 "rx throttle %d\n", urb_status);
635 }
636block:
637 state = rx_cleanup;
638 entry->urb = urb;
639 urb = NULL;
640 break;
641
642
643 case -EOVERFLOW:
644 dev->net->stats.rx_over_errors++;
645 fallthrough;
646
647 default:
648 state = rx_cleanup;
649 dev->net->stats.rx_errors++;
650 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
651 break;
652 }
653
654
655 if (++dev->pkt_cnt > 30) {
656 dev->pkt_cnt = 0;
657 dev->pkt_err = 0;
658 } else {
659 if (state == rx_cleanup)
660 dev->pkt_err++;
661 if (dev->pkt_err > 20)
662 set_bit(EVENT_RX_KILL, &dev->flags);
663 }
664
665 state = defer_bh(dev, skb, &dev->rxq, state);
666
667 if (urb) {
668 if (netif_running (dev->net) &&
669 !test_bit (EVENT_RX_HALT, &dev->flags) &&
670 state != unlink_start) {
671 rx_submit (dev, urb, GFP_ATOMIC);
672 usb_mark_last_busy(dev->udev);
673 return;
674 }
675 usb_free_urb (urb);
676 }
677 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
678}
679
680
681void usbnet_pause_rx(struct usbnet *dev)
682{
683 set_bit(EVENT_RX_PAUSED, &dev->flags);
684
685 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
686}
687EXPORT_SYMBOL_GPL(usbnet_pause_rx);
688
689void usbnet_resume_rx(struct usbnet *dev)
690{
691 struct sk_buff *skb;
692 int num = 0;
693
694 clear_bit(EVENT_RX_PAUSED, &dev->flags);
695
696 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
697 usbnet_skb_return(dev, skb);
698 num++;
699 }
700
701 tasklet_schedule(&dev->bh);
702
703 netif_dbg(dev, rx_status, dev->net,
704 "paused rx queue disabled, %d skbs requeued\n", num);
705}
706EXPORT_SYMBOL_GPL(usbnet_resume_rx);
707
708void usbnet_purge_paused_rxq(struct usbnet *dev)
709{
710 skb_queue_purge(&dev->rxq_pause);
711}
712EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
713
714
715
716
717
718static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
719{
720 unsigned long flags;
721 struct sk_buff *skb;
722 int count = 0;
723
724 spin_lock_irqsave (&q->lock, flags);
725 while (!skb_queue_empty(q)) {
726 struct skb_data *entry;
727 struct urb *urb;
728 int retval;
729
730 skb_queue_walk(q, skb) {
731 entry = (struct skb_data *) skb->cb;
732 if (entry->state != unlink_start)
733 goto found;
734 }
735 break;
736found:
737 entry->state = unlink_start;
738 urb = entry->urb;
739
740
741
742
743
744
745
746
747 usb_get_urb(urb);
748 spin_unlock_irqrestore(&q->lock, flags);
749
750
751 retval = usb_unlink_urb (urb);
752 if (retval != -EINPROGRESS && retval != 0)
753 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
754 else
755 count++;
756 usb_put_urb(urb);
757 spin_lock_irqsave(&q->lock, flags);
758 }
759 spin_unlock_irqrestore (&q->lock, flags);
760 return count;
761}
762
763
764
765
766void usbnet_unlink_rx_urbs(struct usbnet *dev)
767{
768 if (netif_running(dev->net)) {
769 (void) unlink_urbs (dev, &dev->rxq);
770 tasklet_schedule(&dev->bh);
771 }
772}
773EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
774
775
776
777static void wait_skb_queue_empty(struct sk_buff_head *q)
778{
779 unsigned long flags;
780
781 spin_lock_irqsave(&q->lock, flags);
782 while (!skb_queue_empty(q)) {
783 spin_unlock_irqrestore(&q->lock, flags);
784 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
785 set_current_state(TASK_UNINTERRUPTIBLE);
786 spin_lock_irqsave(&q->lock, flags);
787 }
788 spin_unlock_irqrestore(&q->lock, flags);
789}
790
791
792static void usbnet_terminate_urbs(struct usbnet *dev)
793{
794 DECLARE_WAITQUEUE(wait, current);
795 int temp;
796
797
798 add_wait_queue(&dev->wait, &wait);
799 set_current_state(TASK_UNINTERRUPTIBLE);
800 temp = unlink_urbs(dev, &dev->txq) +
801 unlink_urbs(dev, &dev->rxq);
802
803
804 wait_skb_queue_empty(&dev->rxq);
805 wait_skb_queue_empty(&dev->txq);
806 wait_skb_queue_empty(&dev->done);
807 netif_dbg(dev, ifdown, dev->net,
808 "waited for %d urb completions\n", temp);
809 set_current_state(TASK_RUNNING);
810 remove_wait_queue(&dev->wait, &wait);
811}
812
813int usbnet_stop (struct net_device *net)
814{
815 struct usbnet *dev = netdev_priv(net);
816 const struct driver_info *info = dev->driver_info;
817 int retval, pm, mpn;
818
819 clear_bit(EVENT_DEV_OPEN, &dev->flags);
820 netif_stop_queue (net);
821
822 netif_info(dev, ifdown, dev->net,
823 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
824 net->stats.rx_packets, net->stats.tx_packets,
825 net->stats.rx_errors, net->stats.tx_errors);
826
827
828 pm = usb_autopm_get_interface(dev->intf);
829
830
831 if (info->stop) {
832 retval = info->stop(dev);
833 if (retval < 0)
834 netif_info(dev, ifdown, dev->net,
835 "stop fail (%d) usbnet usb-%s-%s, %s\n",
836 retval,
837 dev->udev->bus->bus_name, dev->udev->devpath,
838 info->description);
839 }
840
841 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
842 usbnet_terminate_urbs(dev);
843
844 usbnet_status_stop(dev);
845
846 usbnet_purge_paused_rxq(dev);
847
848 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
849
850
851
852
853
854 dev->flags = 0;
855 del_timer_sync (&dev->delay);
856 tasklet_kill (&dev->bh);
857 if (!pm)
858 usb_autopm_put_interface(dev->intf);
859
860 if (info->manage_power && mpn)
861 info->manage_power(dev, 0);
862 else
863 usb_autopm_put_interface(dev->intf);
864
865 return 0;
866}
867EXPORT_SYMBOL_GPL(usbnet_stop);
868
869
870
871
872
873
874
875int usbnet_open (struct net_device *net)
876{
877 struct usbnet *dev = netdev_priv(net);
878 int retval;
879 const struct driver_info *info = dev->driver_info;
880
881 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
882 netif_info(dev, ifup, dev->net,
883 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
884 retval,
885 dev->udev->bus->bus_name,
886 dev->udev->devpath,
887 info->description);
888 goto done_nopm;
889 }
890
891
892 if (info->reset && (retval = info->reset (dev)) < 0) {
893 netif_info(dev, ifup, dev->net,
894 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
895 retval,
896 dev->udev->bus->bus_name,
897 dev->udev->devpath,
898 info->description);
899 goto done;
900 }
901
902
903 usbnet_update_max_qlen(dev);
904
905
906 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
907 netif_err(dev, ifup, dev->net, "can't open; %d\n", retval);
908 goto done;
909 }
910
911
912 if (dev->interrupt) {
913 retval = usbnet_status_start(dev, GFP_KERNEL);
914 if (retval < 0) {
915 netif_err(dev, ifup, dev->net,
916 "intr submit %d\n", retval);
917 goto done;
918 }
919 }
920
921 set_bit(EVENT_DEV_OPEN, &dev->flags);
922 netif_start_queue (net);
923 netif_info(dev, ifup, dev->net,
924 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
925 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
926 dev->net->mtu,
927 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
928 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
929 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
930 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
931 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
932 "simple");
933
934
935 dev->pkt_cnt = 0;
936 dev->pkt_err = 0;
937 clear_bit(EVENT_RX_KILL, &dev->flags);
938
939
940 tasklet_schedule (&dev->bh);
941 if (info->manage_power) {
942 retval = info->manage_power(dev, 1);
943 if (retval < 0) {
944 retval = 0;
945 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
946 } else {
947 usb_autopm_put_interface(dev->intf);
948 }
949 }
950 return retval;
951done:
952 usb_autopm_put_interface(dev->intf);
953done_nopm:
954 return retval;
955}
956EXPORT_SYMBOL_GPL(usbnet_open);
957
958
959
960
961
962
963
964
965
966
967int usbnet_get_link_ksettings_mii(struct net_device *net,
968 struct ethtool_link_ksettings *cmd)
969{
970 struct usbnet *dev = netdev_priv(net);
971
972 if (!dev->mii.mdio_read)
973 return -EOPNOTSUPP;
974
975 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
976
977 return 0;
978}
979EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii);
980
981int usbnet_get_link_ksettings_internal(struct net_device *net,
982 struct ethtool_link_ksettings *cmd)
983{
984 struct usbnet *dev = netdev_priv(net);
985
986
987
988
989
990
991 if (dev->rx_speed != SPEED_UNSET)
992 cmd->base.speed = dev->rx_speed / 1000000;
993 else if (dev->tx_speed != SPEED_UNSET)
994 cmd->base.speed = dev->tx_speed / 1000000;
995 else
996 cmd->base.speed = SPEED_UNKNOWN;
997
998 return 0;
999}
1000EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
1001
1002int usbnet_set_link_ksettings_mii(struct net_device *net,
1003 const struct ethtool_link_ksettings *cmd)
1004{
1005 struct usbnet *dev = netdev_priv(net);
1006 int retval;
1007
1008 if (!dev->mii.mdio_write)
1009 return -EOPNOTSUPP;
1010
1011 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
1012
1013
1014 if (dev->driver_info->link_reset)
1015 dev->driver_info->link_reset(dev);
1016
1017
1018 usbnet_update_max_qlen(dev);
1019
1020 return retval;
1021}
1022EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii);
1023
1024u32 usbnet_get_link (struct net_device *net)
1025{
1026 struct usbnet *dev = netdev_priv(net);
1027
1028
1029 if (dev->driver_info->check_connect)
1030 return dev->driver_info->check_connect (dev) == 0;
1031
1032
1033 if (dev->mii.mdio_read)
1034 return mii_link_ok(&dev->mii);
1035
1036
1037 return ethtool_op_get_link(net);
1038}
1039EXPORT_SYMBOL_GPL(usbnet_get_link);
1040
1041int usbnet_nway_reset(struct net_device *net)
1042{
1043 struct usbnet *dev = netdev_priv(net);
1044
1045 if (!dev->mii.mdio_write)
1046 return -EOPNOTSUPP;
1047
1048 return mii_nway_restart(&dev->mii);
1049}
1050EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1051
1052void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1053{
1054 struct usbnet *dev = netdev_priv(net);
1055
1056 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1057 strlcpy (info->fw_version, dev->driver_info->description,
1058 sizeof info->fw_version);
1059 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1060}
1061EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1062
1063u32 usbnet_get_msglevel (struct net_device *net)
1064{
1065 struct usbnet *dev = netdev_priv(net);
1066
1067 return dev->msg_enable;
1068}
1069EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1070
1071void usbnet_set_msglevel (struct net_device *net, u32 level)
1072{
1073 struct usbnet *dev = netdev_priv(net);
1074
1075 dev->msg_enable = level;
1076}
1077EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1078
1079
1080static const struct ethtool_ops usbnet_ethtool_ops = {
1081 .get_link = usbnet_get_link,
1082 .nway_reset = usbnet_nway_reset,
1083 .get_drvinfo = usbnet_get_drvinfo,
1084 .get_msglevel = usbnet_get_msglevel,
1085 .set_msglevel = usbnet_set_msglevel,
1086 .get_ts_info = ethtool_op_get_ts_info,
1087 .get_link_ksettings = usbnet_get_link_ksettings_mii,
1088 .set_link_ksettings = usbnet_set_link_ksettings_mii,
1089};
1090
1091
1092
1093static void __handle_link_change(struct usbnet *dev)
1094{
1095 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1096 return;
1097
1098 if (!netif_carrier_ok(dev->net)) {
1099
1100 unlink_urbs(dev, &dev->rxq);
1101
1102
1103
1104
1105
1106 } else {
1107
1108 tasklet_schedule(&dev->bh);
1109 }
1110
1111
1112 usbnet_update_max_qlen(dev);
1113
1114 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1115}
1116
1117void usbnet_set_rx_mode(struct net_device *net)
1118{
1119 struct usbnet *dev = netdev_priv(net);
1120
1121 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1122}
1123EXPORT_SYMBOL_GPL(usbnet_set_rx_mode);
1124
1125static void __handle_set_rx_mode(struct usbnet *dev)
1126{
1127 if (dev->driver_info->set_rx_mode)
1128 (dev->driver_info->set_rx_mode)(dev);
1129
1130 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1131}
1132
1133
1134
1135
1136
1137
1138static void
1139usbnet_deferred_kevent (struct work_struct *work)
1140{
1141 struct usbnet *dev =
1142 container_of(work, struct usbnet, kevent);
1143 int status;
1144
1145
1146 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1147 unlink_urbs (dev, &dev->txq);
1148 status = usb_autopm_get_interface(dev->intf);
1149 if (status < 0)
1150 goto fail_pipe;
1151 status = usb_clear_halt (dev->udev, dev->out);
1152 usb_autopm_put_interface(dev->intf);
1153 if (status < 0 &&
1154 status != -EPIPE &&
1155 status != -ESHUTDOWN) {
1156 if (netif_msg_tx_err (dev))
1157fail_pipe:
1158 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1159 status);
1160 } else {
1161 clear_bit (EVENT_TX_HALT, &dev->flags);
1162 if (status != -ESHUTDOWN)
1163 netif_wake_queue (dev->net);
1164 }
1165 }
1166 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1167 unlink_urbs (dev, &dev->rxq);
1168 status = usb_autopm_get_interface(dev->intf);
1169 if (status < 0)
1170 goto fail_halt;
1171 status = usb_clear_halt (dev->udev, dev->in);
1172 usb_autopm_put_interface(dev->intf);
1173 if (status < 0 &&
1174 status != -EPIPE &&
1175 status != -ESHUTDOWN) {
1176 if (netif_msg_rx_err (dev))
1177fail_halt:
1178 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1179 status);
1180 } else {
1181 clear_bit (EVENT_RX_HALT, &dev->flags);
1182 tasklet_schedule (&dev->bh);
1183 }
1184 }
1185
1186
1187 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1188 struct urb *urb = NULL;
1189 int resched = 1;
1190
1191 if (netif_running (dev->net))
1192 urb = usb_alloc_urb (0, GFP_KERNEL);
1193 else
1194 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1195 if (urb != NULL) {
1196 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1197 status = usb_autopm_get_interface(dev->intf);
1198 if (status < 0) {
1199 usb_free_urb(urb);
1200 goto fail_lowmem;
1201 }
1202 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1203 resched = 0;
1204 usb_autopm_put_interface(dev->intf);
1205fail_lowmem:
1206 if (resched)
1207 tasklet_schedule (&dev->bh);
1208 }
1209 }
1210
1211 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1212 const struct driver_info *info = dev->driver_info;
1213 int retval = 0;
1214
1215 clear_bit (EVENT_LINK_RESET, &dev->flags);
1216 status = usb_autopm_get_interface(dev->intf);
1217 if (status < 0)
1218 goto skip_reset;
1219 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1220 usb_autopm_put_interface(dev->intf);
1221skip_reset:
1222 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1223 retval,
1224 dev->udev->bus->bus_name,
1225 dev->udev->devpath,
1226 info->description);
1227 } else {
1228 usb_autopm_put_interface(dev->intf);
1229 }
1230
1231
1232 __handle_link_change(dev);
1233 }
1234
1235 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1236 __handle_link_change(dev);
1237
1238 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1239 __handle_set_rx_mode(dev);
1240
1241
1242 if (dev->flags)
1243 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1244}
1245
1246
1247
1248static void tx_complete (struct urb *urb)
1249{
1250 struct sk_buff *skb = (struct sk_buff *) urb->context;
1251 struct skb_data *entry = (struct skb_data *) skb->cb;
1252 struct usbnet *dev = entry->dev;
1253
1254 if (urb->status == 0) {
1255 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
1256 unsigned long flags;
1257
1258 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
1259 stats64->tx_packets += entry->packets;
1260 stats64->tx_bytes += entry->length;
1261 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
1262 } else {
1263 dev->net->stats.tx_errors++;
1264
1265 switch (urb->status) {
1266 case -EPIPE:
1267 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1268 break;
1269
1270
1271 case -ECONNRESET:
1272 case -ESHUTDOWN:
1273 break;
1274
1275
1276
1277
1278 case -EPROTO:
1279 case -ETIME:
1280 case -EILSEQ:
1281 usb_mark_last_busy(dev->udev);
1282 if (!timer_pending (&dev->delay)) {
1283 mod_timer (&dev->delay,
1284 jiffies + THROTTLE_JIFFIES);
1285 netif_dbg(dev, link, dev->net,
1286 "tx throttle %d\n", urb->status);
1287 }
1288 netif_stop_queue (dev->net);
1289 break;
1290 default:
1291 netif_dbg(dev, tx_err, dev->net,
1292 "tx err %d\n", entry->urb->status);
1293 break;
1294 }
1295 }
1296
1297 usb_autopm_put_interface_async(dev->intf);
1298 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1299}
1300
1301
1302
1303void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)
1304{
1305 struct usbnet *dev = netdev_priv(net);
1306
1307 unlink_urbs (dev, &dev->txq);
1308 tasklet_schedule (&dev->bh);
1309
1310
1311
1312
1313 if (dev->driver_info->recover)
1314 (dev->driver_info->recover)(dev);
1315}
1316EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1317
1318
1319
1320static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1321{
1322 unsigned num_sgs, total_len = 0;
1323 int i, s = 0;
1324
1325 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1326 if (num_sgs == 1)
1327 return 0;
1328
1329
1330 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),
1331 GFP_ATOMIC);
1332 if (!urb->sg)
1333 return -ENOMEM;
1334
1335 urb->num_sgs = num_sgs;
1336 sg_init_table(urb->sg, urb->num_sgs + 1);
1337
1338 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1339 total_len += skb_headlen(skb);
1340
1341 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1342 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1343
1344 total_len += skb_frag_size(f);
1345 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),
1346 skb_frag_off(f));
1347 }
1348 urb->transfer_buffer_length = total_len;
1349
1350 return 1;
1351}
1352
1353netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1354 struct net_device *net)
1355{
1356 struct usbnet *dev = netdev_priv(net);
1357 unsigned int length;
1358 struct urb *urb = NULL;
1359 struct skb_data *entry;
1360 const struct driver_info *info = dev->driver_info;
1361 unsigned long flags;
1362 int retval;
1363
1364 if (skb)
1365 skb_tx_timestamp(skb);
1366
1367
1368
1369 if (info->tx_fixup) {
1370 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1371 if (!skb) {
1372
1373 if (info->flags & FLAG_MULTI_PACKET)
1374 goto not_drop;
1375 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1376 goto drop;
1377 }
1378 }
1379
1380 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1381 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1382 goto drop;
1383 }
1384
1385 entry = (struct skb_data *) skb->cb;
1386 entry->urb = urb;
1387 entry->dev = dev;
1388
1389 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1390 skb->data, skb->len, tx_complete, skb);
1391 if (dev->can_dma_sg) {
1392 if (build_dma_sg(skb, urb) < 0)
1393 goto drop;
1394 }
1395 length = urb->transfer_buffer_length;
1396
1397
1398
1399
1400
1401
1402
1403
1404 if (length % dev->maxpacket == 0) {
1405 if (!(info->flags & FLAG_SEND_ZLP)) {
1406 if (!(info->flags & FLAG_MULTI_PACKET)) {
1407 length++;
1408 if (skb_tailroom(skb) && !urb->num_sgs) {
1409 skb->data[skb->len] = 0;
1410 __skb_put(skb, 1);
1411 } else if (urb->num_sgs)
1412 sg_set_buf(&urb->sg[urb->num_sgs++],
1413 dev->padding_pkt, 1);
1414 }
1415 } else
1416 urb->transfer_flags |= URB_ZERO_PACKET;
1417 }
1418 urb->transfer_buffer_length = length;
1419
1420 if (info->flags & FLAG_MULTI_PACKET) {
1421
1422
1423
1424
1425 entry->length += length;
1426 if (WARN_ON_ONCE(entry->length <= 0))
1427 entry->length = length;
1428 } else {
1429 usbnet_set_skb_tx_stats(skb, 1, length);
1430 }
1431
1432 spin_lock_irqsave(&dev->txq.lock, flags);
1433 retval = usb_autopm_get_interface_async(dev->intf);
1434 if (retval < 0) {
1435 spin_unlock_irqrestore(&dev->txq.lock, flags);
1436 goto drop;
1437 }
1438 if (netif_queue_stopped(net)) {
1439 usb_autopm_put_interface_async(dev->intf);
1440 spin_unlock_irqrestore(&dev->txq.lock, flags);
1441 goto drop;
1442 }
1443
1444#ifdef CONFIG_PM
1445
1446 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1447
1448 usb_anchor_urb(urb, &dev->deferred);
1449
1450 netif_stop_queue(net);
1451 usb_put_urb(urb);
1452 spin_unlock_irqrestore(&dev->txq.lock, flags);
1453 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1454 goto deferred;
1455 }
1456#endif
1457
1458 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1459 case -EPIPE:
1460 netif_stop_queue (net);
1461 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1462 usb_autopm_put_interface_async(dev->intf);
1463 break;
1464 default:
1465 usb_autopm_put_interface_async(dev->intf);
1466 netif_dbg(dev, tx_err, dev->net,
1467 "tx: submit urb err %d\n", retval);
1468 break;
1469 case 0:
1470 netif_trans_update(net);
1471 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1472 if (dev->txq.qlen >= TX_QLEN (dev))
1473 netif_stop_queue (net);
1474 }
1475 spin_unlock_irqrestore (&dev->txq.lock, flags);
1476
1477 if (retval) {
1478 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1479drop:
1480 dev->net->stats.tx_dropped++;
1481not_drop:
1482 if (skb)
1483 dev_kfree_skb_any (skb);
1484 if (urb) {
1485 kfree(urb->sg);
1486 usb_free_urb(urb);
1487 }
1488 } else
1489 netif_dbg(dev, tx_queued, dev->net,
1490 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1491#ifdef CONFIG_PM
1492deferred:
1493#endif
1494 return NETDEV_TX_OK;
1495}
1496EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1497
1498static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1499{
1500 struct urb *urb;
1501 int i;
1502 int ret = 0;
1503
1504
1505 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1506 urb = usb_alloc_urb(0, flags);
1507 if (urb != NULL) {
1508 ret = rx_submit(dev, urb, flags);
1509 if (ret)
1510 goto err;
1511 } else {
1512 ret = -ENOMEM;
1513 goto err;
1514 }
1515 }
1516err:
1517 return ret;
1518}
1519
1520
1521
1522
1523
1524static void usbnet_bh (struct timer_list *t)
1525{
1526 struct usbnet *dev = from_timer(dev, t, delay);
1527 struct sk_buff *skb;
1528 struct skb_data *entry;
1529
1530 while ((skb = skb_dequeue (&dev->done))) {
1531 entry = (struct skb_data *) skb->cb;
1532 switch (entry->state) {
1533 case rx_done:
1534 entry->state = rx_cleanup;
1535 rx_process (dev, skb);
1536 continue;
1537 case tx_done:
1538 kfree(entry->urb->sg);
1539 fallthrough;
1540 case rx_cleanup:
1541 usb_free_urb (entry->urb);
1542 dev_kfree_skb (skb);
1543 continue;
1544 default:
1545 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1546 }
1547 }
1548
1549
1550 clear_bit(EVENT_RX_KILL, &dev->flags);
1551
1552
1553
1554
1555 if (waitqueue_active(&dev->wait)) {
1556 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1557 wake_up_all(&dev->wait);
1558
1559
1560 } else if (netif_running (dev->net) &&
1561 netif_device_present (dev->net) &&
1562 netif_carrier_ok(dev->net) &&
1563 !timer_pending(&dev->delay) &&
1564 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1565 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1566 int temp = dev->rxq.qlen;
1567
1568 if (temp < RX_QLEN(dev)) {
1569 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1570 return;
1571 if (temp != dev->rxq.qlen)
1572 netif_dbg(dev, link, dev->net,
1573 "rxqlen %d --> %d\n",
1574 temp, dev->rxq.qlen);
1575 if (dev->rxq.qlen < RX_QLEN(dev))
1576 tasklet_schedule (&dev->bh);
1577 }
1578 if (dev->txq.qlen < TX_QLEN (dev))
1579 netif_wake_queue (dev->net);
1580 }
1581}
1582
1583static void usbnet_bh_tasklet(struct tasklet_struct *t)
1584{
1585 struct usbnet *dev = from_tasklet(dev, t, bh);
1586
1587 usbnet_bh(&dev->delay);
1588}
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599void usbnet_disconnect (struct usb_interface *intf)
1600{
1601 struct usbnet *dev;
1602 struct usb_device *xdev;
1603 struct net_device *net;
1604
1605 dev = usb_get_intfdata(intf);
1606 usb_set_intfdata(intf, NULL);
1607 if (!dev)
1608 return;
1609
1610 xdev = interface_to_usbdev (intf);
1611
1612 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1613 intf->dev.driver->name,
1614 xdev->bus->bus_name, xdev->devpath,
1615 dev->driver_info->description);
1616
1617 if (dev->driver_info->unbind)
1618 dev->driver_info->unbind(dev, intf);
1619
1620 net = dev->net;
1621 unregister_netdev (net);
1622
1623 cancel_work_sync(&dev->kevent);
1624
1625 usb_scuttle_anchored_urbs(&dev->deferred);
1626
1627 usb_kill_urb(dev->interrupt);
1628 usb_free_urb(dev->interrupt);
1629 kfree(dev->padding_pkt);
1630
1631 free_percpu(net->tstats);
1632 free_netdev(net);
1633}
1634EXPORT_SYMBOL_GPL(usbnet_disconnect);
1635
1636static const struct net_device_ops usbnet_netdev_ops = {
1637 .ndo_open = usbnet_open,
1638 .ndo_stop = usbnet_stop,
1639 .ndo_start_xmit = usbnet_start_xmit,
1640 .ndo_tx_timeout = usbnet_tx_timeout,
1641 .ndo_set_rx_mode = usbnet_set_rx_mode,
1642 .ndo_change_mtu = usbnet_change_mtu,
1643 .ndo_get_stats64 = dev_get_tstats64,
1644 .ndo_set_mac_address = eth_mac_addr,
1645 .ndo_validate_addr = eth_validate_addr,
1646};
1647
1648
1649
1650
1651
1652static struct device_type wlan_type = {
1653 .name = "wlan",
1654};
1655
1656static struct device_type wwan_type = {
1657 .name = "wwan",
1658};
1659
1660int
1661usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1662{
1663 struct usbnet *dev;
1664 struct net_device *net;
1665 struct usb_host_interface *interface;
1666 const struct driver_info *info;
1667 struct usb_device *xdev;
1668 int status;
1669 const char *name;
1670 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1671
1672
1673
1674
1675
1676 if (!driver->supports_autosuspend) {
1677 driver->supports_autosuspend = 1;
1678 pm_runtime_enable(&udev->dev);
1679 }
1680
1681 name = udev->dev.driver->name;
1682 info = (const struct driver_info *) prod->driver_info;
1683 if (!info) {
1684 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1685 return -ENODEV;
1686 }
1687 xdev = interface_to_usbdev (udev);
1688 interface = udev->cur_altsetting;
1689
1690 status = -ENOMEM;
1691
1692
1693 net = alloc_etherdev(sizeof(*dev));
1694 if (!net)
1695 goto out;
1696
1697
1698 SET_NETDEV_DEV(net, &udev->dev);
1699
1700 dev = netdev_priv(net);
1701 dev->udev = xdev;
1702 dev->intf = udev;
1703 dev->driver_info = info;
1704 dev->driver_name = name;
1705 dev->rx_speed = SPEED_UNSET;
1706 dev->tx_speed = SPEED_UNSET;
1707
1708 net->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1709 if (!net->tstats)
1710 goto out0;
1711
1712 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1713 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1714 init_waitqueue_head(&dev->wait);
1715 skb_queue_head_init (&dev->rxq);
1716 skb_queue_head_init (&dev->txq);
1717 skb_queue_head_init (&dev->done);
1718 skb_queue_head_init(&dev->rxq_pause);
1719 tasklet_setup(&dev->bh, usbnet_bh_tasklet);
1720 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1721 init_usb_anchor(&dev->deferred);
1722 timer_setup(&dev->delay, usbnet_bh, 0);
1723 mutex_init (&dev->phy_mutex);
1724 mutex_init(&dev->interrupt_mutex);
1725 dev->interrupt_count = 0;
1726
1727 dev->net = net;
1728 strcpy (net->name, "usb%d");
1729 memcpy (net->dev_addr, node_id, sizeof node_id);
1730
1731
1732
1733
1734 dev->hard_mtu = net->mtu + net->hard_header_len;
1735 net->min_mtu = 0;
1736 net->max_mtu = ETH_MAX_MTU;
1737
1738 net->netdev_ops = &usbnet_netdev_ops;
1739 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1740 net->ethtool_ops = &usbnet_ethtool_ops;
1741
1742
1743
1744 if (info->bind) {
1745 status = info->bind (dev, udev);
1746 if (status < 0)
1747 goto out1;
1748
1749
1750
1751
1752 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1753 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1754 (net->dev_addr [0] & 0x02) == 0))
1755 strcpy (net->name, "eth%d");
1756
1757 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1758 strcpy(net->name, "wlan%d");
1759
1760 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1761 strcpy(net->name, "wwan%d");
1762
1763
1764 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1765 net->flags |= IFF_NOARP;
1766
1767
1768 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1769 net->mtu = dev->hard_mtu - net->hard_header_len;
1770 } else if (!info->in || !info->out)
1771 status = usbnet_get_endpoints (dev, udev);
1772 else {
1773 dev->in = usb_rcvbulkpipe (xdev, info->in);
1774 dev->out = usb_sndbulkpipe (xdev, info->out);
1775 if (!(info->flags & FLAG_NO_SETINT))
1776 status = usb_set_interface (xdev,
1777 interface->desc.bInterfaceNumber,
1778 interface->desc.bAlternateSetting);
1779 else
1780 status = 0;
1781
1782 }
1783 if (status >= 0 && dev->status)
1784 status = init_status (dev, udev);
1785 if (status < 0)
1786 goto out3;
1787
1788 if (!dev->rx_urb_size)
1789 dev->rx_urb_size = dev->hard_mtu;
1790 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1791
1792
1793 if (ether_addr_equal(net->dev_addr, node_id))
1794 net->addr_assign_type = NET_ADDR_RANDOM;
1795
1796 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1797 SET_NETDEV_DEVTYPE(net, &wlan_type);
1798 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1799 SET_NETDEV_DEVTYPE(net, &wwan_type);
1800
1801
1802 usbnet_update_max_qlen(dev);
1803
1804 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1805 !(info->flags & FLAG_MULTI_PACKET)) {
1806 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1807 if (!dev->padding_pkt) {
1808 status = -ENOMEM;
1809 goto out4;
1810 }
1811 }
1812
1813 status = register_netdev (net);
1814 if (status)
1815 goto out5;
1816 netif_info(dev, probe, dev->net,
1817 "register '%s' at usb-%s-%s, %s, %pM\n",
1818 udev->dev.driver->name,
1819 xdev->bus->bus_name, xdev->devpath,
1820 dev->driver_info->description,
1821 net->dev_addr);
1822
1823
1824 usb_set_intfdata (udev, dev);
1825
1826 netif_device_attach (net);
1827
1828 if (dev->driver_info->flags & FLAG_LINK_INTR)
1829 usbnet_link_change(dev, 0, 0);
1830
1831 return 0;
1832
1833out5:
1834 kfree(dev->padding_pkt);
1835out4:
1836 usb_free_urb(dev->interrupt);
1837out3:
1838 if (info->unbind)
1839 info->unbind (dev, udev);
1840out1:
1841
1842
1843
1844
1845
1846 cancel_work_sync(&dev->kevent);
1847 del_timer_sync(&dev->delay);
1848 free_percpu(net->tstats);
1849out0:
1850 free_netdev(net);
1851out:
1852 return status;
1853}
1854EXPORT_SYMBOL_GPL(usbnet_probe);
1855
1856
1857
1858
1859
1860
1861
1862
1863int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1864{
1865 struct usbnet *dev = usb_get_intfdata(intf);
1866
1867 if (!dev->suspend_count++) {
1868 spin_lock_irq(&dev->txq.lock);
1869
1870 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1871 dev->suspend_count--;
1872 spin_unlock_irq(&dev->txq.lock);
1873 return -EBUSY;
1874 } else {
1875 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1876 spin_unlock_irq(&dev->txq.lock);
1877 }
1878
1879
1880
1881
1882 netif_device_detach (dev->net);
1883 usbnet_terminate_urbs(dev);
1884 __usbnet_status_stop_force(dev);
1885
1886
1887
1888
1889
1890 netif_device_attach (dev->net);
1891 }
1892 return 0;
1893}
1894EXPORT_SYMBOL_GPL(usbnet_suspend);
1895
1896int usbnet_resume (struct usb_interface *intf)
1897{
1898 struct usbnet *dev = usb_get_intfdata(intf);
1899 struct sk_buff *skb;
1900 struct urb *res;
1901 int retval;
1902
1903 if (!--dev->suspend_count) {
1904
1905 __usbnet_status_start_force(dev, GFP_NOIO);
1906
1907 spin_lock_irq(&dev->txq.lock);
1908 while ((res = usb_get_from_anchor(&dev->deferred))) {
1909
1910 skb = (struct sk_buff *)res->context;
1911 retval = usb_submit_urb(res, GFP_ATOMIC);
1912 if (retval < 0) {
1913 dev_kfree_skb_any(skb);
1914 kfree(res->sg);
1915 usb_free_urb(res);
1916 usb_autopm_put_interface_async(dev->intf);
1917 } else {
1918 netif_trans_update(dev->net);
1919 __skb_queue_tail(&dev->txq, skb);
1920 }
1921 }
1922
1923 smp_mb();
1924 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1925 spin_unlock_irq(&dev->txq.lock);
1926
1927 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1928
1929
1930
1931 if (netif_device_present(dev->net) &&
1932 !timer_pending(&dev->delay) &&
1933 !test_bit(EVENT_RX_HALT, &dev->flags))
1934 rx_alloc_submit(dev, GFP_NOIO);
1935
1936 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1937 netif_tx_wake_all_queues(dev->net);
1938 tasklet_schedule (&dev->bh);
1939 }
1940 }
1941
1942 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1943 usb_autopm_get_interface_no_resume(intf);
1944
1945 return 0;
1946}
1947EXPORT_SYMBOL_GPL(usbnet_resume);
1948
1949
1950
1951
1952
1953
1954void usbnet_device_suggests_idle(struct usbnet *dev)
1955{
1956 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1957 dev->intf->needs_remote_wakeup = 1;
1958 usb_autopm_put_interface_async(dev->intf);
1959 }
1960}
1961EXPORT_SYMBOL(usbnet_device_suggests_idle);
1962
1963
1964
1965
1966int usbnet_manage_power(struct usbnet *dev, int on)
1967{
1968 dev->intf->needs_remote_wakeup = on;
1969 return 0;
1970}
1971EXPORT_SYMBOL(usbnet_manage_power);
1972
1973void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1974{
1975
1976 if (link && !need_reset)
1977 netif_carrier_on(dev->net);
1978 else
1979 netif_carrier_off(dev->net);
1980
1981 if (need_reset && link)
1982 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1983 else
1984 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1985}
1986EXPORT_SYMBOL(usbnet_link_change);
1987
1988
1989static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1990 u16 value, u16 index, void *data, u16 size)
1991{
1992 void *buf = NULL;
1993 int err = -ENOMEM;
1994
1995 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1996 " value=0x%04x index=0x%04x size=%d\n",
1997 cmd, reqtype, value, index, size);
1998
1999 if (size) {
2000 buf = kmalloc(size, GFP_KERNEL);
2001 if (!buf)
2002 goto out;
2003 }
2004
2005 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
2006 cmd, reqtype, value, index, buf, size,
2007 USB_CTRL_GET_TIMEOUT);
2008 if (err > 0 && err <= size) {
2009 if (data)
2010 memcpy(data, buf, err);
2011 else
2012 netdev_dbg(dev->net,
2013 "Huh? Data requested but thrown away.\n");
2014 }
2015 kfree(buf);
2016out:
2017 return err;
2018}
2019
2020static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2021 u16 value, u16 index, const void *data,
2022 u16 size)
2023{
2024 void *buf = NULL;
2025 int err = -ENOMEM;
2026
2027 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2028 " value=0x%04x index=0x%04x size=%d\n",
2029 cmd, reqtype, value, index, size);
2030
2031 if (data) {
2032 buf = kmemdup(data, size, GFP_KERNEL);
2033 if (!buf)
2034 goto out;
2035 } else {
2036 if (size) {
2037 WARN_ON_ONCE(1);
2038 err = -EINVAL;
2039 goto out;
2040 }
2041 }
2042
2043 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2044 cmd, reqtype, value, index, buf, size,
2045 USB_CTRL_SET_TIMEOUT);
2046 kfree(buf);
2047
2048out:
2049 return err;
2050}
2051
2052
2053
2054
2055
2056int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2057 u16 value, u16 index, void *data, u16 size)
2058{
2059 int ret;
2060
2061 if (usb_autopm_get_interface(dev->intf) < 0)
2062 return -ENODEV;
2063 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2064 data, size);
2065 usb_autopm_put_interface(dev->intf);
2066 return ret;
2067}
2068EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2069
2070
2071
2072
2073
2074int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2075 u16 value, u16 index, const void *data, u16 size)
2076{
2077 int ret;
2078
2079 if (usb_autopm_get_interface(dev->intf) < 0)
2080 return -ENODEV;
2081 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2082 data, size);
2083 usb_autopm_put_interface(dev->intf);
2084 return ret;
2085}
2086EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2087
2088
2089
2090
2091
2092int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2093 u16 value, u16 index, void *data, u16 size)
2094{
2095 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2096 data, size);
2097}
2098EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2099
2100
2101
2102
2103
2104int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2105 u16 value, u16 index, const void *data,
2106 u16 size)
2107{
2108 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2109 data, size);
2110}
2111EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2112
2113static void usbnet_async_cmd_cb(struct urb *urb)
2114{
2115 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2116 int status = urb->status;
2117
2118 if (status < 0)
2119 dev_dbg(&urb->dev->dev, "%s failed with %d",
2120 __func__, status);
2121
2122 kfree(req);
2123 usb_free_urb(urb);
2124}
2125
2126
2127
2128
2129
2130int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2131 u16 value, u16 index, const void *data, u16 size)
2132{
2133 struct usb_ctrlrequest *req = NULL;
2134 struct urb *urb;
2135 int err = -ENOMEM;
2136 void *buf = NULL;
2137
2138 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2139 " value=0x%04x index=0x%04x size=%d\n",
2140 cmd, reqtype, value, index, size);
2141
2142 urb = usb_alloc_urb(0, GFP_ATOMIC);
2143 if (!urb)
2144 goto fail;
2145
2146 if (data) {
2147 buf = kmemdup(data, size, GFP_ATOMIC);
2148 if (!buf) {
2149 netdev_err(dev->net, "Error allocating buffer"
2150 " in %s!\n", __func__);
2151 goto fail_free;
2152 }
2153 }
2154
2155 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2156 if (!req)
2157 goto fail_free_buf;
2158
2159 req->bRequestType = reqtype;
2160 req->bRequest = cmd;
2161 req->wValue = cpu_to_le16(value);
2162 req->wIndex = cpu_to_le16(index);
2163 req->wLength = cpu_to_le16(size);
2164
2165 usb_fill_control_urb(urb, dev->udev,
2166 usb_sndctrlpipe(dev->udev, 0),
2167 (void *)req, buf, size,
2168 usbnet_async_cmd_cb, req);
2169 urb->transfer_flags |= URB_FREE_BUFFER;
2170
2171 err = usb_submit_urb(urb, GFP_ATOMIC);
2172 if (err < 0) {
2173 netdev_err(dev->net, "Error submitting the control"
2174 " message: status=%d\n", err);
2175 goto fail_free;
2176 }
2177 return 0;
2178
2179fail_free_buf:
2180 kfree(buf);
2181fail_free:
2182 kfree(req);
2183 usb_free_urb(urb);
2184fail:
2185 return err;
2186
2187}
2188EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2189
2190
2191static int __init usbnet_init(void)
2192{
2193
2194 BUILD_BUG_ON(
2195 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));
2196
2197 eth_random_addr(node_id);
2198 return 0;
2199}
2200module_init(usbnet_init);
2201
2202static void __exit usbnet_exit(void)
2203{
2204}
2205module_exit(usbnet_exit);
2206
2207MODULE_AUTHOR("David Brownell");
2208MODULE_DESCRIPTION("USB network driver framework");
2209MODULE_LICENSE("GPL");
2210