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Linux 2.6.33-rc8
[linux-2.6/lguest.git] / drivers / net / usb / usbnet.c
blob035fab04c0a03575f821d8124493b8ae9d595567
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46
47 #define DRIVER_VERSION "22-Aug-2005"
48
49
50 /*-------------------------------------------------------------------------*/
51
52 /*
53 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
54 * Several dozen bytes of IPv4 data can fit in two such transactions.
55 * One maximum size Ethernet packet takes twenty four of them.
56 * For high speed, each frame comfortably fits almost 36 max size
57 * Ethernet packets (so queues should be bigger).
58 *
59 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
60 * let the USB host controller be busy for 5msec or more before an irq
61 * is required, under load. Jumbograms change the equation.
62 */
63 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
64 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
65 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
66 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
67 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
72 // throttle rx/tx briefly after some faults, so khubd might disconnect()
73 // us (it polls at HZ/4 usually) before we report too many false errors.
74 #define THROTTLE_JIFFIES (HZ/8)
75
76 // between wakeups
77 #define UNLINK_TIMEOUT_MS 3
78
79 /*-------------------------------------------------------------------------*/
80
81 // randomly generated ethernet address
82 static u8 node_id [ETH_ALEN];
83
84 static const char driver_name [] = "usbnet";
85
86 /* use ethtool to change the level for any given device */
87 static int msg_level = -1;
88 module_param (msg_level, int, 0);
89 MODULE_PARM_DESC (msg_level, "Override default message level");
90
91 /*-------------------------------------------------------------------------*/
92
93 /* handles CDC Ethernet and many other network "bulk data" interfaces */
94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
95 {
96 int tmp;
97 struct usb_host_interface *alt = NULL;
98 struct usb_host_endpoint *in = NULL, *out = NULL;
99 struct usb_host_endpoint *status = NULL;
100
101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
102 unsigned ep;
103
104 in = out = status = NULL;
105 alt = intf->altsetting + tmp;
106
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
109 * ignore other endpoints and altsetttings.
110 */
111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
112 struct usb_host_endpoint *e;
113 int intr = 0;
114
115 e = alt->endpoint + ep;
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
118 if (!usb_endpoint_dir_in(&e->desc))
119 continue;
120 intr = 1;
121 /* FALLTHROUGH */
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
127 if (usb_endpoint_dir_in(&e->desc)) {
128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
143 if (alt->desc.bAlternateSetting != 0 ||
144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
146 alt->desc.bAlternateSetting);
147 if (tmp < 0)
148 return tmp;
149 }
150
151 dev->in = usb_rcvbulkpipe (dev->udev,
152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
153 dev->out = usb_sndbulkpipe (dev->udev,
154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->status = status;
156 return 0;
157 }
158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159
160 static u8 nibble(unsigned char c)
161 {
162 if (likely(isdigit(c)))
163 return c - '0';
164 c = toupper(c);
165 if (likely(isxdigit(c)))
166 return 10 + c - 'A';
167 return 0;
168 }
169
170 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
171 {
172 int tmp, i;
173 unsigned char buf [13];
174
175 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
176 if (tmp != 12) {
177 dev_dbg(&dev->udev->dev,
178 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
179 if (tmp >= 0)
180 tmp = -EINVAL;
181 return tmp;
182 }
183 for (i = tmp = 0; i < 6; i++, tmp += 2)
184 dev->net->dev_addr [i] =
185 (nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]);
186 return 0;
187 }
188 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
189
190 static void intr_complete (struct urb *urb);
191
192 static int init_status (struct usbnet *dev, struct usb_interface *intf)
193 {
194 char *buf = NULL;
195 unsigned pipe = 0;
196 unsigned maxp;
197 unsigned period;
198
199 if (!dev->driver_info->status)
200 return 0;
201
202 pipe = usb_rcvintpipe (dev->udev,
203 dev->status->desc.bEndpointAddress
204 & USB_ENDPOINT_NUMBER_MASK);
205 maxp = usb_maxpacket (dev->udev, pipe, 0);
206
207 /* avoid 1 msec chatter: min 8 msec poll rate */
208 period = max ((int) dev->status->desc.bInterval,
209 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
210
211 buf = kmalloc (maxp, GFP_KERNEL);
212 if (buf) {
213 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
214 if (!dev->interrupt) {
215 kfree (buf);
216 return -ENOMEM;
217 } else {
218 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
219 buf, maxp, intr_complete, dev, period);
220 dev_dbg(&intf->dev,
221 "status ep%din, %d bytes period %d\n",
222 usb_pipeendpoint(pipe), maxp, period);
223 }
224 }
225 return 0;
226 }
227
228 /* Passes this packet up the stack, updating its accounting.
229 * Some link protocols batch packets, so their rx_fixup paths
230 * can return clones as well as just modify the original skb.
231 */
232 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
233 {
234 int status;
235
236 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
237 skb_queue_tail(&dev->rxq_pause, skb);
238 return;
239 }
240
241 skb->protocol = eth_type_trans (skb, dev->net);
242 dev->net->stats.rx_packets++;
243 dev->net->stats.rx_bytes += skb->len;
244
245 if (netif_msg_rx_status (dev))
246 devdbg (dev, "< rx, len %zu, type 0x%x",
247 skb->len + sizeof (struct ethhdr), skb->protocol);
248 memset (skb->cb, 0, sizeof (struct skb_data));
249 status = netif_rx (skb);
250 if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
251 devdbg (dev, "netif_rx status %d", status);
252 }
253 EXPORT_SYMBOL_GPL(usbnet_skb_return);
254
255 \f
256 /*-------------------------------------------------------------------------
257 *
258 * Network Device Driver (peer link to "Host Device", from USB host)
259 *
260 *-------------------------------------------------------------------------*/
261
262 int usbnet_change_mtu (struct net_device *net, int new_mtu)
263 {
264 struct usbnet *dev = netdev_priv(net);
265 int ll_mtu = new_mtu + net->hard_header_len;
266 int old_hard_mtu = dev->hard_mtu;
267 int old_rx_urb_size = dev->rx_urb_size;
268
269 if (new_mtu <= 0)
270 return -EINVAL;
271 // no second zero-length packet read wanted after mtu-sized packets
272 if ((ll_mtu % dev->maxpacket) == 0)
273 return -EDOM;
274 net->mtu = new_mtu;
275
276 dev->hard_mtu = net->mtu + net->hard_header_len;
277 if (dev->rx_urb_size == old_hard_mtu) {
278 dev->rx_urb_size = dev->hard_mtu;
279 if (dev->rx_urb_size > old_rx_urb_size)
280 usbnet_unlink_rx_urbs(dev);
281 }
282
283 return 0;
284 }
285 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
286
287 /*-------------------------------------------------------------------------*/
288
289 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
290 * completion callbacks. 2.5 should have fixed those bugs...
291 */
292
293 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
294 {
295 unsigned long flags;
296
297 spin_lock_irqsave(&list->lock, flags);
298 __skb_unlink(skb, list);
299 spin_unlock(&list->lock);
300 spin_lock(&dev->done.lock);
301 __skb_queue_tail(&dev->done, skb);
302 if (dev->done.qlen == 1)
303 tasklet_schedule(&dev->bh);
304 spin_unlock_irqrestore(&dev->done.lock, flags);
305 }
306
307 /* some work can't be done in tasklets, so we use keventd
308 *
309 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
310 * but tasklet_schedule() doesn't. hope the failure is rare.
311 */
312 void usbnet_defer_kevent (struct usbnet *dev, int work)
313 {
314 set_bit (work, &dev->flags);
315 if (!schedule_work (&dev->kevent))
316 deverr (dev, "kevent %d may have been dropped", work);
317 else
318 devdbg (dev, "kevent %d scheduled", work);
319 }
320 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
321
322 /*-------------------------------------------------------------------------*/
323
324 static void rx_complete (struct urb *urb);
325
326 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
327 {
328 struct sk_buff *skb;
329 struct skb_data *entry;
330 int retval = 0;
331 unsigned long lockflags;
332 size_t size = dev->rx_urb_size;
333
334 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
335 if (netif_msg_rx_err (dev))
336 devdbg (dev, "no rx skb");
337 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
338 usb_free_urb (urb);
339 return;
340 }
341 skb_reserve (skb, NET_IP_ALIGN);
342
343 entry = (struct skb_data *) skb->cb;
344 entry->urb = urb;
345 entry->dev = dev;
346 entry->state = rx_start;
347 entry->length = 0;
348
349 usb_fill_bulk_urb (urb, dev->udev, dev->in,
350 skb->data, size, rx_complete, skb);
351
352 spin_lock_irqsave (&dev->rxq.lock, lockflags);
353
354 if (netif_running (dev->net) &&
355 netif_device_present (dev->net) &&
356 !test_bit (EVENT_RX_HALT, &dev->flags) &&
357 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
358 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
359 case -EPIPE:
360 usbnet_defer_kevent (dev, EVENT_RX_HALT);
361 break;
362 case -ENOMEM:
363 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
364 break;
365 case -ENODEV:
366 if (netif_msg_ifdown (dev))
367 devdbg (dev, "device gone");
368 netif_device_detach (dev->net);
369 break;
370 default:
371 if (netif_msg_rx_err (dev))
372 devdbg (dev, "rx submit, %d", retval);
373 tasklet_schedule (&dev->bh);
374 break;
375 case 0:
376 __skb_queue_tail (&dev->rxq, skb);
377 }
378 } else {
379 if (netif_msg_ifdown (dev))
380 devdbg (dev, "rx: stopped");
381 retval = -ENOLINK;
382 }
383 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
384 if (retval) {
385 dev_kfree_skb_any (skb);
386 usb_free_urb (urb);
387 }
388 }
389
390
391 /*-------------------------------------------------------------------------*/
392
393 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
394 {
395 if (dev->driver_info->rx_fixup &&
396 !dev->driver_info->rx_fixup (dev, skb))
397 goto error;
398 // else network stack removes extra byte if we forced a short packet
399
400 if (skb->len)
401 usbnet_skb_return (dev, skb);
402 else {
403 if (netif_msg_rx_err (dev))
404 devdbg (dev, "drop");
405 error:
406 dev->net->stats.rx_errors++;
407 skb_queue_tail (&dev->done, skb);
408 }
409 }
410
411 /*-------------------------------------------------------------------------*/
412
413 static void rx_complete (struct urb *urb)
414 {
415 struct sk_buff *skb = (struct sk_buff *) urb->context;
416 struct skb_data *entry = (struct skb_data *) skb->cb;
417 struct usbnet *dev = entry->dev;
418 int urb_status = urb->status;
419
420 skb_put (skb, urb->actual_length);
421 entry->state = rx_done;
422 entry->urb = NULL;
423
424 switch (urb_status) {
425 /* success */
426 case 0:
427 if (skb->len < dev->net->hard_header_len) {
428 entry->state = rx_cleanup;
429 dev->net->stats.rx_errors++;
430 dev->net->stats.rx_length_errors++;
431 if (netif_msg_rx_err (dev))
432 devdbg (dev, "rx length %d", skb->len);
433 }
434 break;
435
436 /* stalls need manual reset. this is rare ... except that
437 * when going through USB 2.0 TTs, unplug appears this way.
438 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
439 * storm, recovering as needed.
440 */
441 case -EPIPE:
442 dev->net->stats.rx_errors++;
443 usbnet_defer_kevent (dev, EVENT_RX_HALT);
444 // FALLTHROUGH
445
446 /* software-driven interface shutdown */
447 case -ECONNRESET: /* async unlink */
448 case -ESHUTDOWN: /* hardware gone */
449 if (netif_msg_ifdown (dev))
450 devdbg (dev, "rx shutdown, code %d", urb_status);
451 goto block;
452
453 /* we get controller i/o faults during khubd disconnect() delays.
454 * throttle down resubmits, to avoid log floods; just temporarily,
455 * so we still recover when the fault isn't a khubd delay.
456 */
457 case -EPROTO:
458 case -ETIME:
459 case -EILSEQ:
460 dev->net->stats.rx_errors++;
461 if (!timer_pending (&dev->delay)) {
462 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
463 if (netif_msg_link (dev))
464 devdbg (dev, "rx throttle %d", urb_status);
465 }
466 block:
467 entry->state = rx_cleanup;
468 entry->urb = urb;
469 urb = NULL;
470 break;
471
472 /* data overrun ... flush fifo? */
473 case -EOVERFLOW:
474 dev->net->stats.rx_over_errors++;
475 // FALLTHROUGH
476
477 default:
478 entry->state = rx_cleanup;
479 dev->net->stats.rx_errors++;
480 if (netif_msg_rx_err (dev))
481 devdbg (dev, "rx status %d", urb_status);
482 break;
483 }
484
485 defer_bh(dev, skb, &dev->rxq);
486
487 if (urb) {
488 if (netif_running (dev->net) &&
489 !test_bit (EVENT_RX_HALT, &dev->flags)) {
490 rx_submit (dev, urb, GFP_ATOMIC);
491 return;
492 }
493 usb_free_urb (urb);
494 }
495 if (netif_msg_rx_err (dev))
496 devdbg (dev, "no read resubmitted");
497 }
498
499 static void intr_complete (struct urb *urb)
500 {
501 struct usbnet *dev = urb->context;
502 int status = urb->status;
503
504 switch (status) {
505 /* success */
506 case 0:
507 dev->driver_info->status(dev, urb);
508 break;
509
510 /* software-driven interface shutdown */
511 case -ENOENT: /* urb killed */
512 case -ESHUTDOWN: /* hardware gone */
513 if (netif_msg_ifdown (dev))
514 devdbg (dev, "intr shutdown, code %d", status);
515 return;
516
517 /* NOTE: not throttling like RX/TX, since this endpoint
518 * already polls infrequently
519 */
520 default:
521 devdbg (dev, "intr status %d", status);
522 break;
523 }
524
525 if (!netif_running (dev->net))
526 return;
527
528 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
529 status = usb_submit_urb (urb, GFP_ATOMIC);
530 if (status != 0 && netif_msg_timer (dev))
531 deverr(dev, "intr resubmit --> %d", status);
532 }
533
534 /*-------------------------------------------------------------------------*/
535 void usbnet_pause_rx(struct usbnet *dev)
536 {
537 set_bit(EVENT_RX_PAUSED, &dev->flags);
538
539 if (netif_msg_rx_status(dev))
540 devdbg(dev, "paused rx queue enabled");
541 }
542 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
543
544 void usbnet_resume_rx(struct usbnet *dev)
545 {
546 struct sk_buff *skb;
547 int num = 0;
548
549 clear_bit(EVENT_RX_PAUSED, &dev->flags);
550
551 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
552 usbnet_skb_return(dev, skb);
553 num++;
554 }
555
556 tasklet_schedule(&dev->bh);
557
558 if (netif_msg_rx_status(dev))
559 devdbg(dev, "paused rx queue disabled, %d skbs requeued", num);
560 }
561 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
562
563 void usbnet_purge_paused_rxq(struct usbnet *dev)
564 {
565 skb_queue_purge(&dev->rxq_pause);
566 }
567 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
568
569 /*-------------------------------------------------------------------------*/
570
571 // unlink pending rx/tx; completion handlers do all other cleanup
572
573 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
574 {
575 unsigned long flags;
576 struct sk_buff *skb, *skbnext;
577 int count = 0;
578
579 spin_lock_irqsave (&q->lock, flags);
580 skb_queue_walk_safe(q, skb, skbnext) {
581 struct skb_data *entry;
582 struct urb *urb;
583 int retval;
584
585 entry = (struct skb_data *) skb->cb;
586 urb = entry->urb;
587
588 // during some PM-driven resume scenarios,
589 // these (async) unlinks complete immediately
590 retval = usb_unlink_urb (urb);
591 if (retval != -EINPROGRESS && retval != 0)
592 devdbg (dev, "unlink urb err, %d", retval);
593 else
594 count++;
595 }
596 spin_unlock_irqrestore (&q->lock, flags);
597 return count;
598 }
599
600 // Flush all pending rx urbs
601 // minidrivers may need to do this when the MTU changes
602
603 void usbnet_unlink_rx_urbs(struct usbnet *dev)
604 {
605 if (netif_running(dev->net)) {
606 (void) unlink_urbs (dev, &dev->rxq);
607 tasklet_schedule(&dev->bh);
608 }
609 }
610 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
611
612 /*-------------------------------------------------------------------------*/
613
614 // precondition: never called in_interrupt
615 static void usbnet_terminate_urbs(struct usbnet *dev)
616 {
617 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
618 DECLARE_WAITQUEUE(wait, current);
619 int temp;
620
621 /* ensure there are no more active urbs */
622 add_wait_queue(&unlink_wakeup, &wait);
623 set_current_state(TASK_UNINTERRUPTIBLE);
624 dev->wait = &unlink_wakeup;
625 temp = unlink_urbs(dev, &dev->txq) +
626 unlink_urbs(dev, &dev->rxq);
627
628 /* maybe wait for deletions to finish. */
629 while (!skb_queue_empty(&dev->rxq)
630 && !skb_queue_empty(&dev->txq)
631 && !skb_queue_empty(&dev->done)) {
632 schedule_timeout(UNLINK_TIMEOUT_MS);
633 set_current_state(TASK_UNINTERRUPTIBLE);
634 if (netif_msg_ifdown(dev))
635 devdbg(dev, "waited for %d urb completions",
636 temp);
637 }
638 set_current_state(TASK_RUNNING);
639 dev->wait = NULL;
640 remove_wait_queue(&unlink_wakeup, &wait);
641 }
642
643 int usbnet_stop (struct net_device *net)
644 {
645 struct usbnet *dev = netdev_priv(net);
646 struct driver_info *info = dev->driver_info;
647 int retval;
648
649 netif_stop_queue (net);
650
651 if (netif_msg_ifdown (dev))
652 devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
653 net->stats.rx_packets, net->stats.tx_packets,
654 net->stats.rx_errors, net->stats.tx_errors
655 );
656
657 /* allow minidriver to stop correctly (wireless devices to turn off
658 * radio etc) */
659 if (info->stop) {
660 retval = info->stop(dev);
661 if (retval < 0 && netif_msg_ifdown(dev))
662 devinfo(dev,
663 "stop fail (%d) usbnet usb-%s-%s, %s",
664 retval,
665 dev->udev->bus->bus_name, dev->udev->devpath,
666 info->description);
667 }
668
669 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
670 usbnet_terminate_urbs(dev);
671
672 usb_kill_urb(dev->interrupt);
673
674 usbnet_purge_paused_rxq(dev);
675
676 /* deferred work (task, timer, softirq) must also stop.
677 * can't flush_scheduled_work() until we drop rtnl (later),
678 * else workers could deadlock; so make workers a NOP.
679 */
680 dev->flags = 0;
681 del_timer_sync (&dev->delay);
682 tasklet_kill (&dev->bh);
683 if (info->manage_power)
684 info->manage_power(dev, 0);
685 else
686 usb_autopm_put_interface(dev->intf);
687
688 return 0;
689 }
690 EXPORT_SYMBOL_GPL(usbnet_stop);
691
692 /*-------------------------------------------------------------------------*/
693
694 // posts reads, and enables write queuing
695
696 // precondition: never called in_interrupt
697
698 int usbnet_open (struct net_device *net)
699 {
700 struct usbnet *dev = netdev_priv(net);
701 int retval;
702 struct driver_info *info = dev->driver_info;
703
704 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
705 if (netif_msg_ifup (dev))
706 devinfo (dev,
707 "resumption fail (%d) usbnet usb-%s-%s, %s",
708 retval,
709 dev->udev->bus->bus_name, dev->udev->devpath,
710 info->description);
711 goto done_nopm;
712 }
713
714 // put into "known safe" state
715 if (info->reset && (retval = info->reset (dev)) < 0) {
716 if (netif_msg_ifup (dev))
717 devinfo (dev,
718 "open reset fail (%d) usbnet usb-%s-%s, %s",
719 retval,
720 dev->udev->bus->bus_name, dev->udev->devpath,
721 info->description);
722 goto done;
723 }
724
725 // insist peer be connected
726 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
727 if (netif_msg_ifup (dev))
728 devdbg (dev, "can't open; %d", retval);
729 goto done;
730 }
731
732 /* start any status interrupt transfer */
733 if (dev->interrupt) {
734 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
735 if (retval < 0) {
736 if (netif_msg_ifup (dev))
737 deverr (dev, "intr submit %d", retval);
738 goto done;
739 }
740 }
741
742 netif_start_queue (net);
743 if (netif_msg_ifup (dev)) {
744 char *framing;
745
746 if (dev->driver_info->flags & FLAG_FRAMING_NC)
747 framing = "NetChip";
748 else if (dev->driver_info->flags & FLAG_FRAMING_GL)
749 framing = "GeneSys";
750 else if (dev->driver_info->flags & FLAG_FRAMING_Z)
751 framing = "Zaurus";
752 else if (dev->driver_info->flags & FLAG_FRAMING_RN)
753 framing = "RNDIS";
754 else if (dev->driver_info->flags & FLAG_FRAMING_AX)
755 framing = "ASIX";
756 else
757 framing = "simple";
758
759 devinfo (dev, "open: enable queueing "
760 "(rx %d, tx %d) mtu %d %s framing",
761 (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu,
762 framing);
763 }
764
765 // delay posting reads until we're fully open
766 tasklet_schedule (&dev->bh);
767 if (info->manage_power) {
768 retval = info->manage_power(dev, 1);
769 if (retval < 0)
770 goto done;
771 usb_autopm_put_interface(dev->intf);
772 }
773 return retval;
774 done:
775 usb_autopm_put_interface(dev->intf);
776 done_nopm:
777 return retval;
778 }
779 EXPORT_SYMBOL_GPL(usbnet_open);
780
781 /*-------------------------------------------------------------------------*/
782
783 /* ethtool methods; minidrivers may need to add some more, but
784 * they'll probably want to use this base set.
785 */
786
787 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
788 {
789 struct usbnet *dev = netdev_priv(net);
790
791 if (!dev->mii.mdio_read)
792 return -EOPNOTSUPP;
793
794 return mii_ethtool_gset(&dev->mii, cmd);
795 }
796 EXPORT_SYMBOL_GPL(usbnet_get_settings);
797
798 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
799 {
800 struct usbnet *dev = netdev_priv(net);
801 int retval;
802
803 if (!dev->mii.mdio_write)
804 return -EOPNOTSUPP;
805
806 retval = mii_ethtool_sset(&dev->mii, cmd);
807
808 /* link speed/duplex might have changed */
809 if (dev->driver_info->link_reset)
810 dev->driver_info->link_reset(dev);
811
812 return retval;
813
814 }
815 EXPORT_SYMBOL_GPL(usbnet_set_settings);
816
817 u32 usbnet_get_link (struct net_device *net)
818 {
819 struct usbnet *dev = netdev_priv(net);
820
821 /* If a check_connect is defined, return its result */
822 if (dev->driver_info->check_connect)
823 return dev->driver_info->check_connect (dev) == 0;
824
825 /* if the device has mii operations, use those */
826 if (dev->mii.mdio_read)
827 return mii_link_ok(&dev->mii);
828
829 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
830 return ethtool_op_get_link(net);
831 }
832 EXPORT_SYMBOL_GPL(usbnet_get_link);
833
834 int usbnet_nway_reset(struct net_device *net)
835 {
836 struct usbnet *dev = netdev_priv(net);
837
838 if (!dev->mii.mdio_write)
839 return -EOPNOTSUPP;
840
841 return mii_nway_restart(&dev->mii);
842 }
843 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
844
845 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
846 {
847 struct usbnet *dev = netdev_priv(net);
848
849 strncpy (info->driver, dev->driver_name, sizeof info->driver);
850 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
851 strncpy (info->fw_version, dev->driver_info->description,
852 sizeof info->fw_version);
853 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
854 }
855 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
856
857 u32 usbnet_get_msglevel (struct net_device *net)
858 {
859 struct usbnet *dev = netdev_priv(net);
860
861 return dev->msg_enable;
862 }
863 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
864
865 void usbnet_set_msglevel (struct net_device *net, u32 level)
866 {
867 struct usbnet *dev = netdev_priv(net);
868
869 dev->msg_enable = level;
870 }
871 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
872
873 /* drivers may override default ethtool_ops in their bind() routine */
874 static const struct ethtool_ops usbnet_ethtool_ops = {
875 .get_settings = usbnet_get_settings,
876 .set_settings = usbnet_set_settings,
877 .get_link = usbnet_get_link,
878 .nway_reset = usbnet_nway_reset,
879 .get_drvinfo = usbnet_get_drvinfo,
880 .get_msglevel = usbnet_get_msglevel,
881 .set_msglevel = usbnet_set_msglevel,
882 };
883
884 /*-------------------------------------------------------------------------*/
885
886 /* work that cannot be done in interrupt context uses keventd.
887 *
888 * NOTE: with 2.5 we could do more of this using completion callbacks,
889 * especially now that control transfers can be queued.
890 */
891 static void
892 kevent (struct work_struct *work)
893 {
894 struct usbnet *dev =
895 container_of(work, struct usbnet, kevent);
896 int status;
897
898 /* usb_clear_halt() needs a thread context */
899 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
900 unlink_urbs (dev, &dev->txq);
901 status = usb_autopm_get_interface(dev->intf);
902 if (status < 0)
903 goto fail_pipe;
904 status = usb_clear_halt (dev->udev, dev->out);
905 usb_autopm_put_interface(dev->intf);
906 if (status < 0 &&
907 status != -EPIPE &&
908 status != -ESHUTDOWN) {
909 if (netif_msg_tx_err (dev))
910 fail_pipe:
911 deverr (dev, "can't clear tx halt, status %d",
912 status);
913 } else {
914 clear_bit (EVENT_TX_HALT, &dev->flags);
915 if (status != -ESHUTDOWN)
916 netif_wake_queue (dev->net);
917 }
918 }
919 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
920 unlink_urbs (dev, &dev->rxq);
921 status = usb_autopm_get_interface(dev->intf);
922 if (status < 0)
923 goto fail_halt;
924 status = usb_clear_halt (dev->udev, dev->in);
925 usb_autopm_put_interface(dev->intf);
926 if (status < 0 &&
927 status != -EPIPE &&
928 status != -ESHUTDOWN) {
929 if (netif_msg_rx_err (dev))
930 fail_halt:
931 deverr (dev, "can't clear rx halt, status %d",
932 status);
933 } else {
934 clear_bit (EVENT_RX_HALT, &dev->flags);
935 tasklet_schedule (&dev->bh);
936 }
937 }
938
939 /* tasklet could resubmit itself forever if memory is tight */
940 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
941 struct urb *urb = NULL;
942
943 if (netif_running (dev->net))
944 urb = usb_alloc_urb (0, GFP_KERNEL);
945 else
946 clear_bit (EVENT_RX_MEMORY, &dev->flags);
947 if (urb != NULL) {
948 clear_bit (EVENT_RX_MEMORY, &dev->flags);
949 status = usb_autopm_get_interface(dev->intf);
950 if (status < 0)
951 goto fail_lowmem;
952 rx_submit (dev, urb, GFP_KERNEL);
953 usb_autopm_put_interface(dev->intf);
954 fail_lowmem:
955 tasklet_schedule (&dev->bh);
956 }
957 }
958
959 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
960 struct driver_info *info = dev->driver_info;
961 int retval = 0;
962
963 clear_bit (EVENT_LINK_RESET, &dev->flags);
964 status = usb_autopm_get_interface(dev->intf);
965 if (status < 0)
966 goto skip_reset;
967 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
968 usb_autopm_put_interface(dev->intf);
969 skip_reset:
970 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
971 retval,
972 dev->udev->bus->bus_name, dev->udev->devpath,
973 info->description);
974 } else {
975 usb_autopm_put_interface(dev->intf);
976 }
977 }
978
979 if (dev->flags)
980 devdbg (dev, "kevent done, flags = 0x%lx",
981 dev->flags);
982 }
983
984 /*-------------------------------------------------------------------------*/
985
986 static void tx_complete (struct urb *urb)
987 {
988 struct sk_buff *skb = (struct sk_buff *) urb->context;
989 struct skb_data *entry = (struct skb_data *) skb->cb;
990 struct usbnet *dev = entry->dev;
991
992 if (urb->status == 0) {
993 dev->net->stats.tx_packets++;
994 dev->net->stats.tx_bytes += entry->length;
995 } else {
996 dev->net->stats.tx_errors++;
997
998 switch (urb->status) {
999 case -EPIPE:
1000 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1001 break;
1002
1003 /* software-driven interface shutdown */
1004 case -ECONNRESET: // async unlink
1005 case -ESHUTDOWN: // hardware gone
1006 break;
1007
1008 // like rx, tx gets controller i/o faults during khubd delays
1009 // and so it uses the same throttling mechanism.
1010 case -EPROTO:
1011 case -ETIME:
1012 case -EILSEQ:
1013 usb_mark_last_busy(dev->udev);
1014 if (!timer_pending (&dev->delay)) {
1015 mod_timer (&dev->delay,
1016 jiffies + THROTTLE_JIFFIES);
1017 if (netif_msg_link (dev))
1018 devdbg (dev, "tx throttle %d",
1019 urb->status);
1020 }
1021 netif_stop_queue (dev->net);
1022 break;
1023 default:
1024 if (netif_msg_tx_err (dev))
1025 devdbg (dev, "tx err %d", entry->urb->status);
1026 break;
1027 }
1028 }
1029
1030 usb_autopm_put_interface_async(dev->intf);
1031 urb->dev = NULL;
1032 entry->state = tx_done;
1033 defer_bh(dev, skb, &dev->txq);
1034 }
1035
1036 /*-------------------------------------------------------------------------*/
1037
1038 void usbnet_tx_timeout (struct net_device *net)
1039 {
1040 struct usbnet *dev = netdev_priv(net);
1041
1042 unlink_urbs (dev, &dev->txq);
1043 tasklet_schedule (&dev->bh);
1044
1045 // FIXME: device recovery -- reset?
1046 }
1047 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1048
1049 /*-------------------------------------------------------------------------*/
1050
1051 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1052 struct net_device *net)
1053 {
1054 struct usbnet *dev = netdev_priv(net);
1055 int length;
1056 struct urb *urb = NULL;
1057 struct skb_data *entry;
1058 struct driver_info *info = dev->driver_info;
1059 unsigned long flags;
1060 int retval;
1061
1062 // some devices want funky USB-level framing, for
1063 // win32 driver (usually) and/or hardware quirks
1064 if (info->tx_fixup) {
1065 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1066 if (!skb) {
1067 if (netif_msg_tx_err (dev))
1068 devdbg (dev, "can't tx_fixup skb");
1069 goto drop;
1070 }
1071 }
1072 length = skb->len;
1073
1074 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1075 if (netif_msg_tx_err (dev))
1076 devdbg (dev, "no urb");
1077 goto drop;
1078 }
1079
1080 entry = (struct skb_data *) skb->cb;
1081 entry->urb = urb;
1082 entry->dev = dev;
1083 entry->state = tx_start;
1084 entry->length = length;
1085
1086 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1087 skb->data, skb->len, tx_complete, skb);
1088
1089 /* don't assume the hardware handles USB_ZERO_PACKET
1090 * NOTE: strictly conforming cdc-ether devices should expect
1091 * the ZLP here, but ignore the one-byte packet.
1092 */
1093 if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) {
1094 urb->transfer_buffer_length++;
1095 if (skb_tailroom(skb)) {
1096 skb->data[skb->len] = 0;
1097 __skb_put(skb, 1);
1098 }
1099 }
1100
1101 spin_lock_irqsave(&dev->txq.lock, flags);
1102 retval = usb_autopm_get_interface_async(dev->intf);
1103 if (retval < 0) {
1104 spin_unlock_irqrestore(&dev->txq.lock, flags);
1105 goto drop;
1106 }
1107
1108 #ifdef CONFIG_PM
1109 /* if this triggers the device is still a sleep */
1110 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1111 /* transmission will be done in resume */
1112 usb_anchor_urb(urb, &dev->deferred);
1113 /* no use to process more packets */
1114 netif_stop_queue(net);
1115 spin_unlock_irqrestore(&dev->txq.lock, flags);
1116 devdbg(dev, "Delaying transmission for resumption");
1117 goto deferred;
1118 }
1119 #endif
1120
1121 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1122 case -EPIPE:
1123 netif_stop_queue (net);
1124 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1125 usb_autopm_put_interface_async(dev->intf);
1126 break;
1127 default:
1128 usb_autopm_put_interface_async(dev->intf);
1129 if (netif_msg_tx_err (dev))
1130 devdbg (dev, "tx: submit urb err %d", retval);
1131 break;
1132 case 0:
1133 net->trans_start = jiffies;
1134 __skb_queue_tail (&dev->txq, skb);
1135 if (dev->txq.qlen >= TX_QLEN (dev))
1136 netif_stop_queue (net);
1137 }
1138 spin_unlock_irqrestore (&dev->txq.lock, flags);
1139
1140 if (retval) {
1141 if (netif_msg_tx_err (dev))
1142 devdbg (dev, "drop, code %d", retval);
1143 drop:
1144 dev->net->stats.tx_dropped++;
1145 if (skb)
1146 dev_kfree_skb_any (skb);
1147 usb_free_urb (urb);
1148 } else if (netif_msg_tx_queued (dev)) {
1149 devdbg (dev, "> tx, len %d, type 0x%x",
1150 length, skb->protocol);
1151 }
1152 #ifdef CONFIG_PM
1153 deferred:
1154 #endif
1155 return NETDEV_TX_OK;
1156 }
1157 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1158
1159 /*-------------------------------------------------------------------------*/
1160
1161 // tasklet (work deferred from completions, in_irq) or timer
1162
1163 static void usbnet_bh (unsigned long param)
1164 {
1165 struct usbnet *dev = (struct usbnet *) param;
1166 struct sk_buff *skb;
1167 struct skb_data *entry;
1168
1169 while ((skb = skb_dequeue (&dev->done))) {
1170 entry = (struct skb_data *) skb->cb;
1171 switch (entry->state) {
1172 case rx_done:
1173 entry->state = rx_cleanup;
1174 rx_process (dev, skb);
1175 continue;
1176 case tx_done:
1177 case rx_cleanup:
1178 usb_free_urb (entry->urb);
1179 dev_kfree_skb (skb);
1180 continue;
1181 default:
1182 devdbg (dev, "bogus skb state %d", entry->state);
1183 }
1184 }
1185
1186 // waiting for all pending urbs to complete?
1187 if (dev->wait) {
1188 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1189 wake_up (dev->wait);
1190 }
1191
1192 // or are we maybe short a few urbs?
1193 } else if (netif_running (dev->net) &&
1194 netif_device_present (dev->net) &&
1195 !timer_pending (&dev->delay) &&
1196 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1197 int temp = dev->rxq.qlen;
1198 int qlen = RX_QLEN (dev);
1199
1200 if (temp < qlen) {
1201 struct urb *urb;
1202 int i;
1203
1204 // don't refill the queue all at once
1205 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1206 urb = usb_alloc_urb (0, GFP_ATOMIC);
1207 if (urb != NULL)
1208 rx_submit (dev, urb, GFP_ATOMIC);
1209 }
1210 if (temp != dev->rxq.qlen && netif_msg_link (dev))
1211 devdbg (dev, "rxqlen %d --> %d",
1212 temp, dev->rxq.qlen);
1213 if (dev->rxq.qlen < qlen)
1214 tasklet_schedule (&dev->bh);
1215 }
1216 if (dev->txq.qlen < TX_QLEN (dev))
1217 netif_wake_queue (dev->net);
1218 }
1219 }
1220
1221
1222 /*-------------------------------------------------------------------------
1223 *
1224 * USB Device Driver support
1225 *
1226 *-------------------------------------------------------------------------*/
1227
1228 // precondition: never called in_interrupt
1229
1230 void usbnet_disconnect (struct usb_interface *intf)
1231 {
1232 struct usbnet *dev;
1233 struct usb_device *xdev;
1234 struct net_device *net;
1235
1236 dev = usb_get_intfdata(intf);
1237 usb_set_intfdata(intf, NULL);
1238 if (!dev)
1239 return;
1240
1241 xdev = interface_to_usbdev (intf);
1242
1243 if (netif_msg_probe (dev))
1244 devinfo (dev, "unregister '%s' usb-%s-%s, %s",
1245 intf->dev.driver->name,
1246 xdev->bus->bus_name, xdev->devpath,
1247 dev->driver_info->description);
1248
1249 net = dev->net;
1250 unregister_netdev (net);
1251
1252 /* we don't hold rtnl here ... */
1253 flush_scheduled_work ();
1254
1255 if (dev->driver_info->unbind)
1256 dev->driver_info->unbind (dev, intf);
1257
1258 free_netdev(net);
1259 usb_put_dev (xdev);
1260 }
1261 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1262
1263 static const struct net_device_ops usbnet_netdev_ops = {
1264 .ndo_open = usbnet_open,
1265 .ndo_stop = usbnet_stop,
1266 .ndo_start_xmit = usbnet_start_xmit,
1267 .ndo_tx_timeout = usbnet_tx_timeout,
1268 .ndo_change_mtu = usbnet_change_mtu,
1269 .ndo_set_mac_address = eth_mac_addr,
1270 .ndo_validate_addr = eth_validate_addr,
1271 };
1272
1273 /*-------------------------------------------------------------------------*/
1274
1275 // precondition: never called in_interrupt
1276
1277 static struct device_type wlan_type = {
1278 .name = "wlan",
1279 };
1280
1281 static struct device_type wwan_type = {
1282 .name = "wwan",
1283 };
1284
1285 int
1286 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1287 {
1288 struct usbnet *dev;
1289 struct net_device *net;
1290 struct usb_host_interface *interface;
1291 struct driver_info *info;
1292 struct usb_device *xdev;
1293 int status;
1294 const char *name;
1295
1296 name = udev->dev.driver->name;
1297 info = (struct driver_info *) prod->driver_info;
1298 if (!info) {
1299 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1300 return -ENODEV;
1301 }
1302 xdev = interface_to_usbdev (udev);
1303 interface = udev->cur_altsetting;
1304
1305 usb_get_dev (xdev);
1306
1307 status = -ENOMEM;
1308
1309 // set up our own records
1310 net = alloc_etherdev(sizeof(*dev));
1311 if (!net) {
1312 dbg ("can't kmalloc dev");
1313 goto out;
1314 }
1315
1316 dev = netdev_priv(net);
1317 dev->udev = xdev;
1318 dev->intf = udev;
1319 dev->driver_info = info;
1320 dev->driver_name = name;
1321 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1322 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1323 skb_queue_head_init (&dev->rxq);
1324 skb_queue_head_init (&dev->txq);
1325 skb_queue_head_init (&dev->done);
1326 skb_queue_head_init(&dev->rxq_pause);
1327 dev->bh.func = usbnet_bh;
1328 dev->bh.data = (unsigned long) dev;
1329 INIT_WORK (&dev->kevent, kevent);
1330 init_usb_anchor(&dev->deferred);
1331 dev->delay.function = usbnet_bh;
1332 dev->delay.data = (unsigned long) dev;
1333 init_timer (&dev->delay);
1334 mutex_init (&dev->phy_mutex);
1335
1336 dev->net = net;
1337 strcpy (net->name, "usb%d");
1338 memcpy (net->dev_addr, node_id, sizeof node_id);
1339
1340 /* rx and tx sides can use different message sizes;
1341 * bind() should set rx_urb_size in that case.
1342 */
1343 dev->hard_mtu = net->mtu + net->hard_header_len;
1344 #if 0
1345 // dma_supported() is deeply broken on almost all architectures
1346 // possible with some EHCI controllers
1347 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1348 net->features |= NETIF_F_HIGHDMA;
1349 #endif
1350
1351 net->netdev_ops = &usbnet_netdev_ops;
1352 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1353 net->ethtool_ops = &usbnet_ethtool_ops;
1354
1355 // allow device-specific bind/init procedures
1356 // NOTE net->name still not usable ...
1357 if (info->bind) {
1358 status = info->bind (dev, udev);
1359 if (status < 0)
1360 goto out1;
1361
1362 // heuristic: "usb%d" for links we know are two-host,
1363 // else "eth%d" when there's reasonable doubt. userspace
1364 // can rename the link if it knows better.
1365 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1366 (net->dev_addr [0] & 0x02) == 0)
1367 strcpy (net->name, "eth%d");
1368 /* WLAN devices should always be named "wlan%d" */
1369 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1370 strcpy(net->name, "wlan%d");
1371 /* WWAN devices should always be named "wwan%d" */
1372 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1373 strcpy(net->name, "wwan%d");
1374
1375 /* maybe the remote can't receive an Ethernet MTU */
1376 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1377 net->mtu = dev->hard_mtu - net->hard_header_len;
1378 } else if (!info->in || !info->out)
1379 status = usbnet_get_endpoints (dev, udev);
1380 else {
1381 dev->in = usb_rcvbulkpipe (xdev, info->in);
1382 dev->out = usb_sndbulkpipe (xdev, info->out);
1383 if (!(info->flags & FLAG_NO_SETINT))
1384 status = usb_set_interface (xdev,
1385 interface->desc.bInterfaceNumber,
1386 interface->desc.bAlternateSetting);
1387 else
1388 status = 0;
1389
1390 }
1391 if (status >= 0 && dev->status)
1392 status = init_status (dev, udev);
1393 if (status < 0)
1394 goto out3;
1395
1396 if (!dev->rx_urb_size)
1397 dev->rx_urb_size = dev->hard_mtu;
1398 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1399
1400 SET_NETDEV_DEV(net, &udev->dev);
1401
1402 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1403 SET_NETDEV_DEVTYPE(net, &wlan_type);
1404 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1405 SET_NETDEV_DEVTYPE(net, &wwan_type);
1406
1407 status = register_netdev (net);
1408 if (status)
1409 goto out3;
1410 if (netif_msg_probe (dev))
1411 devinfo (dev, "register '%s' at usb-%s-%s, %s, %pM",
1412 udev->dev.driver->name,
1413 xdev->bus->bus_name, xdev->devpath,
1414 dev->driver_info->description,
1415 net->dev_addr);
1416
1417 // ok, it's ready to go.
1418 usb_set_intfdata (udev, dev);
1419
1420 netif_device_attach (net);
1421
1422 if (dev->driver_info->flags & FLAG_LINK_INTR)
1423 netif_carrier_off(net);
1424
1425 return 0;
1426
1427 out3:
1428 if (info->unbind)
1429 info->unbind (dev, udev);
1430 out1:
1431 free_netdev(net);
1432 out:
1433 usb_put_dev(xdev);
1434 return status;
1435 }
1436 EXPORT_SYMBOL_GPL(usbnet_probe);
1437
1438 /*-------------------------------------------------------------------------*/
1439
1440 /*
1441 * suspend the whole driver as soon as the first interface is suspended
1442 * resume only when the last interface is resumed
1443 */
1444
1445 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1446 {
1447 struct usbnet *dev = usb_get_intfdata(intf);
1448
1449 if (!dev->suspend_count++) {
1450 spin_lock_irq(&dev->txq.lock);
1451 /* don't autosuspend while transmitting */
1452 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1453 spin_unlock_irq(&dev->txq.lock);
1454 return -EBUSY;
1455 } else {
1456 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1457 spin_unlock_irq(&dev->txq.lock);
1458 }
1459 /*
1460 * accelerate emptying of the rx and queues, to avoid
1461 * having everything error out.
1462 */
1463 netif_device_detach (dev->net);
1464 usbnet_terminate_urbs(dev);
1465 usb_kill_urb(dev->interrupt);
1466
1467 /*
1468 * reattach so runtime management can use and
1469 * wake the device
1470 */
1471 netif_device_attach (dev->net);
1472 }
1473 return 0;
1474 }
1475 EXPORT_SYMBOL_GPL(usbnet_suspend);
1476
1477 int usbnet_resume (struct usb_interface *intf)
1478 {
1479 struct usbnet *dev = usb_get_intfdata(intf);
1480 struct sk_buff *skb;
1481 struct urb *res;
1482 int retval;
1483
1484 if (!--dev->suspend_count) {
1485 spin_lock_irq(&dev->txq.lock);
1486 while ((res = usb_get_from_anchor(&dev->deferred))) {
1487
1488 printk(KERN_INFO"%s has delayed data\n", __func__);
1489 skb = (struct sk_buff *)res->context;
1490 retval = usb_submit_urb(res, GFP_ATOMIC);
1491 if (retval < 0) {
1492 dev_kfree_skb_any(skb);
1493 usb_free_urb(res);
1494 usb_autopm_put_interface_async(dev->intf);
1495 } else {
1496 dev->net->trans_start = jiffies;
1497 __skb_queue_tail(&dev->txq, skb);
1498 }
1499 }
1500
1501 smp_mb();
1502 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1503 spin_unlock_irq(&dev->txq.lock);
1504 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1505 netif_start_queue(dev->net);
1506 tasklet_schedule (&dev->bh);
1507 }
1508 return 0;
1509 }
1510 EXPORT_SYMBOL_GPL(usbnet_resume);
1511
1512
1513 /*-------------------------------------------------------------------------*/
1514
1515 static int __init usbnet_init(void)
1516 {
1517 /* compiler should optimize this out */
1518 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1519 < sizeof (struct skb_data));
1520
1521 random_ether_addr(node_id);
1522 return 0;
1523 }
1524 module_init(usbnet_init);
1525
1526 static void __exit usbnet_exit(void)
1527 {
1528 }
1529 module_exit(usbnet_exit);
1530
1531 MODULE_AUTHOR("David Brownell");
1532 MODULE_DESCRIPTION("USB network driver framework");
1533 MODULE_LICENSE("GPL");
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