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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / net / usb / usbnet.c
blobb7fbd35c796defcfa49c24552baadbf9fc97a5fa
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 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
49
50 #define DRIVER_VERSION "22-Aug-2005"
51
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
65 */
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
71
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
74
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
78
79 // between wakeups
80 #define UNLINK_TIMEOUT_MS 3
81
82 /*-------------------------------------------------------------------------*/
83
84 // randomly generated ethernet address
85 static u8 node_id [ETH_ALEN];
86
87 static const char driver_name [] = "usbnet";
88
89 /* use ethtool to change the level for any given device */
90 static int msg_level = -1;
91 module_param (msg_level, int, 0);
92 MODULE_PARM_DESC (msg_level, "Override default message level");
93
94 /*-------------------------------------------------------------------------*/
95
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
98 {
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsettings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
130 if (usb_endpoint_dir_in(&e->desc)) {
131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
153
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160 }
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
162
163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164 {
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
179 return 0;
180 }
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
183 static void intr_complete (struct urb *urb);
184
185 static int init_status (struct usbnet *dev, struct usb_interface *intf)
186 {
187 char *buf = NULL;
188 unsigned pipe = 0;
189 unsigned maxp;
190 unsigned period;
191
192 if (!dev->driver_info->status)
193 return 0;
194
195 pipe = usb_rcvintpipe (dev->udev,
196 dev->status->desc.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK);
198 maxp = usb_maxpacket (dev->udev, pipe, 0);
199
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period = max ((int) dev->status->desc.bInterval,
202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
203
204 buf = kmalloc (maxp, GFP_KERNEL);
205 if (buf) {
206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
207 if (!dev->interrupt) {
208 kfree (buf);
209 return -ENOMEM;
210 } else {
211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
212 buf, maxp, intr_complete, dev, period);
213 dev_dbg(&intf->dev,
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe), maxp, period);
216 }
217 }
218 return 0;
219 }
220
221 /* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
224 */
225 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
226 {
227 int status;
228
229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
230 skb_queue_tail(&dev->rxq_pause, skb);
231 return;
232 }
233
234 skb->protocol = eth_type_trans (skb, dev->net);
235 dev->net->stats.rx_packets++;
236 dev->net->stats.rx_bytes += skb->len;
237
238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
239 skb->len + sizeof (struct ethhdr), skb->protocol);
240 memset (skb->cb, 0, sizeof (struct skb_data));
241
242 if (skb_defer_rx_timestamp(skb))
243 return;
244
245 status = netif_rx (skb);
246 if (status != NET_RX_SUCCESS)
247 netif_dbg(dev, rx_err, dev->net,
248 "netif_rx status %d\n", status);
249 }
250 EXPORT_SYMBOL_GPL(usbnet_skb_return);
251
252 \f
253 /*-------------------------------------------------------------------------
254 *
255 * Network Device Driver (peer link to "Host Device", from USB host)
256 *
257 *-------------------------------------------------------------------------*/
258
259 int usbnet_change_mtu (struct net_device *net, int new_mtu)
260 {
261 struct usbnet *dev = netdev_priv(net);
262 int ll_mtu = new_mtu + net->hard_header_len;
263 int old_hard_mtu = dev->hard_mtu;
264 int old_rx_urb_size = dev->rx_urb_size;
265
266 if (new_mtu <= 0)
267 return -EINVAL;
268 // no second zero-length packet read wanted after mtu-sized packets
269 if ((ll_mtu % dev->maxpacket) == 0)
270 return -EDOM;
271 net->mtu = new_mtu;
272
273 dev->hard_mtu = net->mtu + net->hard_header_len;
274 if (dev->rx_urb_size == old_hard_mtu) {
275 dev->rx_urb_size = dev->hard_mtu;
276 if (dev->rx_urb_size > old_rx_urb_size)
277 usbnet_unlink_rx_urbs(dev);
278 }
279
280 return 0;
281 }
282 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
283
284 /* The caller must hold list->lock */
285 static void __usbnet_queue_skb(struct sk_buff_head *list,
286 struct sk_buff *newsk, enum skb_state state)
287 {
288 struct skb_data *entry = (struct skb_data *) newsk->cb;
289
290 __skb_queue_tail(list, newsk);
291 entry->state = state;
292 }
293
294 /*-------------------------------------------------------------------------*/
295
296 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
297 * completion callbacks. 2.5 should have fixed those bugs...
298 */
299
300 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
301 struct sk_buff_head *list, enum skb_state state)
302 {
303 unsigned long flags;
304 enum skb_state old_state;
305 struct skb_data *entry = (struct skb_data *) skb->cb;
306
307 spin_lock_irqsave(&list->lock, flags);
308 old_state = entry->state;
309 entry->state = state;
310 __skb_unlink(skb, list);
311 spin_unlock(&list->lock);
312 spin_lock(&dev->done.lock);
313 __skb_queue_tail(&dev->done, skb);
314 if (dev->done.qlen == 1)
315 tasklet_schedule(&dev->bh);
316 spin_unlock_irqrestore(&dev->done.lock, flags);
317 return old_state;
318 }
319
320 /* some work can't be done in tasklets, so we use keventd
321 *
322 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
323 * but tasklet_schedule() doesn't. hope the failure is rare.
324 */
325 void usbnet_defer_kevent (struct usbnet *dev, int work)
326 {
327 set_bit (work, &dev->flags);
328 if (!schedule_work (&dev->kevent))
329 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
330 else
331 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
332 }
333 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
334
335 /*-------------------------------------------------------------------------*/
336
337 static void rx_complete (struct urb *urb);
338
339 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
340 {
341 struct sk_buff *skb;
342 struct skb_data *entry;
343 int retval = 0;
344 unsigned long lockflags;
345 size_t size = dev->rx_urb_size;
346
347 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
348 if (!skb) {
349 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
350 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
351 usb_free_urb (urb);
352 return -ENOMEM;
353 }
354
355 entry = (struct skb_data *) skb->cb;
356 entry->urb = urb;
357 entry->dev = dev;
358 entry->length = 0;
359
360 usb_fill_bulk_urb (urb, dev->udev, dev->in,
361 skb->data, size, rx_complete, skb);
362
363 spin_lock_irqsave (&dev->rxq.lock, lockflags);
364
365 if (netif_running (dev->net) &&
366 netif_device_present (dev->net) &&
367 !test_bit (EVENT_RX_HALT, &dev->flags) &&
368 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
369 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
370 case -EPIPE:
371 usbnet_defer_kevent (dev, EVENT_RX_HALT);
372 break;
373 case -ENOMEM:
374 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
375 break;
376 case -ENODEV:
377 netif_dbg(dev, ifdown, dev->net, "device gone\n");
378 netif_device_detach (dev->net);
379 break;
380 case -EHOSTUNREACH:
381 retval = -ENOLINK;
382 break;
383 default:
384 netif_dbg(dev, rx_err, dev->net,
385 "rx submit, %d\n", retval);
386 tasklet_schedule (&dev->bh);
387 break;
388 case 0:
389 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
390 }
391 } else {
392 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
393 retval = -ENOLINK;
394 }
395 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
396 if (retval) {
397 dev_kfree_skb_any (skb);
398 usb_free_urb (urb);
399 }
400 return retval;
401 }
402
403
404 /*-------------------------------------------------------------------------*/
405
406 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
407 {
408 if (dev->driver_info->rx_fixup &&
409 !dev->driver_info->rx_fixup (dev, skb)) {
410 /* With RX_ASSEMBLE, rx_fixup() must update counters */
411 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
412 dev->net->stats.rx_errors++;
413 goto done;
414 }
415 // else network stack removes extra byte if we forced a short packet
416
417 if (skb->len) {
418 /* all data was already cloned from skb inside the driver */
419 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
420 dev_kfree_skb_any(skb);
421 else
422 usbnet_skb_return(dev, skb);
423 return;
424 }
425
426 netif_dbg(dev, rx_err, dev->net, "drop\n");
427 dev->net->stats.rx_errors++;
428 done:
429 skb_queue_tail(&dev->done, skb);
430 }
431
432 /*-------------------------------------------------------------------------*/
433
434 static void rx_complete (struct urb *urb)
435 {
436 struct sk_buff *skb = (struct sk_buff *) urb->context;
437 struct skb_data *entry = (struct skb_data *) skb->cb;
438 struct usbnet *dev = entry->dev;
439 int urb_status = urb->status;
440 enum skb_state state;
441
442 skb_put (skb, urb->actual_length);
443 state = rx_done;
444 entry->urb = NULL;
445
446 switch (urb_status) {
447 /* success */
448 case 0:
449 if (skb->len < dev->net->hard_header_len) {
450 state = rx_cleanup;
451 dev->net->stats.rx_errors++;
452 dev->net->stats.rx_length_errors++;
453 netif_dbg(dev, rx_err, dev->net,
454 "rx length %d\n", skb->len);
455 }
456 break;
457
458 /* stalls need manual reset. this is rare ... except that
459 * when going through USB 2.0 TTs, unplug appears this way.
460 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
461 * storm, recovering as needed.
462 */
463 case -EPIPE:
464 dev->net->stats.rx_errors++;
465 usbnet_defer_kevent (dev, EVENT_RX_HALT);
466 // FALLTHROUGH
467
468 /* software-driven interface shutdown */
469 case -ECONNRESET: /* async unlink */
470 case -ESHUTDOWN: /* hardware gone */
471 netif_dbg(dev, ifdown, dev->net,
472 "rx shutdown, code %d\n", urb_status);
473 goto block;
474
475 /* we get controller i/o faults during khubd disconnect() delays.
476 * throttle down resubmits, to avoid log floods; just temporarily,
477 * so we still recover when the fault isn't a khubd delay.
478 */
479 case -EPROTO:
480 case -ETIME:
481 case -EILSEQ:
482 dev->net->stats.rx_errors++;
483 if (!timer_pending (&dev->delay)) {
484 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
485 netif_dbg(dev, link, dev->net,
486 "rx throttle %d\n", urb_status);
487 }
488 block:
489 state = rx_cleanup;
490 entry->urb = urb;
491 urb = NULL;
492 break;
493
494 /* data overrun ... flush fifo? */
495 case -EOVERFLOW:
496 dev->net->stats.rx_over_errors++;
497 // FALLTHROUGH
498
499 default:
500 state = rx_cleanup;
501 dev->net->stats.rx_errors++;
502 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
503 break;
504 }
505
506 state = defer_bh(dev, skb, &dev->rxq, state);
507
508 if (urb) {
509 if (netif_running (dev->net) &&
510 !test_bit (EVENT_RX_HALT, &dev->flags) &&
511 state != unlink_start) {
512 rx_submit (dev, urb, GFP_ATOMIC);
513 return;
514 }
515 usb_free_urb (urb);
516 }
517 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
518 }
519
520 static void intr_complete (struct urb *urb)
521 {
522 struct usbnet *dev = urb->context;
523 int status = urb->status;
524
525 switch (status) {
526 /* success */
527 case 0:
528 dev->driver_info->status(dev, urb);
529 break;
530
531 /* software-driven interface shutdown */
532 case -ENOENT: /* urb killed */
533 case -ESHUTDOWN: /* hardware gone */
534 netif_dbg(dev, ifdown, dev->net,
535 "intr shutdown, code %d\n", status);
536 return;
537
538 /* NOTE: not throttling like RX/TX, since this endpoint
539 * already polls infrequently
540 */
541 default:
542 netdev_dbg(dev->net, "intr status %d\n", status);
543 break;
544 }
545
546 if (!netif_running (dev->net))
547 return;
548
549 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
550 status = usb_submit_urb (urb, GFP_ATOMIC);
551 if (status != 0)
552 netif_err(dev, timer, dev->net,
553 "intr resubmit --> %d\n", status);
554 }
555
556 /*-------------------------------------------------------------------------*/
557 void usbnet_pause_rx(struct usbnet *dev)
558 {
559 set_bit(EVENT_RX_PAUSED, &dev->flags);
560
561 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
562 }
563 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
564
565 void usbnet_resume_rx(struct usbnet *dev)
566 {
567 struct sk_buff *skb;
568 int num = 0;
569
570 clear_bit(EVENT_RX_PAUSED, &dev->flags);
571
572 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
573 usbnet_skb_return(dev, skb);
574 num++;
575 }
576
577 tasklet_schedule(&dev->bh);
578
579 netif_dbg(dev, rx_status, dev->net,
580 "paused rx queue disabled, %d skbs requeued\n", num);
581 }
582 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
583
584 void usbnet_purge_paused_rxq(struct usbnet *dev)
585 {
586 skb_queue_purge(&dev->rxq_pause);
587 }
588 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
589
590 /*-------------------------------------------------------------------------*/
591
592 // unlink pending rx/tx; completion handlers do all other cleanup
593
594 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
595 {
596 unsigned long flags;
597 struct sk_buff *skb;
598 int count = 0;
599
600 spin_lock_irqsave (&q->lock, flags);
601 while (!skb_queue_empty(q)) {
602 struct skb_data *entry;
603 struct urb *urb;
604 int retval;
605
606 skb_queue_walk(q, skb) {
607 entry = (struct skb_data *) skb->cb;
608 if (entry->state != unlink_start)
609 goto found;
610 }
611 break;
612 found:
613 entry->state = unlink_start;
614 urb = entry->urb;
615
616 /*
617 * Get reference count of the URB to avoid it to be
618 * freed during usb_unlink_urb, which may trigger
619 * use-after-free problem inside usb_unlink_urb since
620 * usb_unlink_urb is always racing with .complete
621 * handler(include defer_bh).
622 */
623 usb_get_urb(urb);
624 spin_unlock_irqrestore(&q->lock, flags);
625 // during some PM-driven resume scenarios,
626 // these (async) unlinks complete immediately
627 retval = usb_unlink_urb (urb);
628 if (retval != -EINPROGRESS && retval != 0)
629 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
630 else
631 count++;
632 usb_put_urb(urb);
633 spin_lock_irqsave(&q->lock, flags);
634 }
635 spin_unlock_irqrestore (&q->lock, flags);
636 return count;
637 }
638
639 // Flush all pending rx urbs
640 // minidrivers may need to do this when the MTU changes
641
642 void usbnet_unlink_rx_urbs(struct usbnet *dev)
643 {
644 if (netif_running(dev->net)) {
645 (void) unlink_urbs (dev, &dev->rxq);
646 tasklet_schedule(&dev->bh);
647 }
648 }
649 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
650
651 /*-------------------------------------------------------------------------*/
652
653 // precondition: never called in_interrupt
654 static void usbnet_terminate_urbs(struct usbnet *dev)
655 {
656 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
657 DECLARE_WAITQUEUE(wait, current);
658 int temp;
659
660 /* ensure there are no more active urbs */
661 add_wait_queue(&unlink_wakeup, &wait);
662 set_current_state(TASK_UNINTERRUPTIBLE);
663 dev->wait = &unlink_wakeup;
664 temp = unlink_urbs(dev, &dev->txq) +
665 unlink_urbs(dev, &dev->rxq);
666
667 /* maybe wait for deletions to finish. */
668 while (!skb_queue_empty(&dev->rxq)
669 && !skb_queue_empty(&dev->txq)
670 && !skb_queue_empty(&dev->done)) {
671 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
672 set_current_state(TASK_UNINTERRUPTIBLE);
673 netif_dbg(dev, ifdown, dev->net,
674 "waited for %d urb completions\n", temp);
675 }
676 set_current_state(TASK_RUNNING);
677 dev->wait = NULL;
678 remove_wait_queue(&unlink_wakeup, &wait);
679 }
680
681 int usbnet_stop (struct net_device *net)
682 {
683 struct usbnet *dev = netdev_priv(net);
684 struct driver_info *info = dev->driver_info;
685 int retval;
686
687 clear_bit(EVENT_DEV_OPEN, &dev->flags);
688 netif_stop_queue (net);
689
690 netif_info(dev, ifdown, dev->net,
691 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
692 net->stats.rx_packets, net->stats.tx_packets,
693 net->stats.rx_errors, net->stats.tx_errors);
694
695 /* allow minidriver to stop correctly (wireless devices to turn off
696 * radio etc) */
697 if (info->stop) {
698 retval = info->stop(dev);
699 if (retval < 0)
700 netif_info(dev, ifdown, dev->net,
701 "stop fail (%d) usbnet usb-%s-%s, %s\n",
702 retval,
703 dev->udev->bus->bus_name, dev->udev->devpath,
704 info->description);
705 }
706
707 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
708 usbnet_terminate_urbs(dev);
709
710 usb_kill_urb(dev->interrupt);
711
712 usbnet_purge_paused_rxq(dev);
713
714 /* deferred work (task, timer, softirq) must also stop.
715 * can't flush_scheduled_work() until we drop rtnl (later),
716 * else workers could deadlock; so make workers a NOP.
717 */
718 dev->flags = 0;
719 del_timer_sync (&dev->delay);
720 tasklet_kill (&dev->bh);
721 if (info->manage_power)
722 info->manage_power(dev, 0);
723 else
724 usb_autopm_put_interface(dev->intf);
725
726 return 0;
727 }
728 EXPORT_SYMBOL_GPL(usbnet_stop);
729
730 /*-------------------------------------------------------------------------*/
731
732 // posts reads, and enables write queuing
733
734 // precondition: never called in_interrupt
735
736 int usbnet_open (struct net_device *net)
737 {
738 struct usbnet *dev = netdev_priv(net);
739 int retval;
740 struct driver_info *info = dev->driver_info;
741
742 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
743 netif_info(dev, ifup, dev->net,
744 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
745 retval,
746 dev->udev->bus->bus_name,
747 dev->udev->devpath,
748 info->description);
749 goto done_nopm;
750 }
751
752 // put into "known safe" state
753 if (info->reset && (retval = info->reset (dev)) < 0) {
754 netif_info(dev, ifup, dev->net,
755 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
756 retval,
757 dev->udev->bus->bus_name,
758 dev->udev->devpath,
759 info->description);
760 goto done;
761 }
762
763 // insist peer be connected
764 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
765 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
766 goto done;
767 }
768
769 /* start any status interrupt transfer */
770 if (dev->interrupt) {
771 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
772 if (retval < 0) {
773 netif_err(dev, ifup, dev->net,
774 "intr submit %d\n", retval);
775 goto done;
776 }
777 }
778
779 set_bit(EVENT_DEV_OPEN, &dev->flags);
780 netif_start_queue (net);
781 netif_info(dev, ifup, dev->net,
782 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
783 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
784 dev->net->mtu,
785 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
786 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
787 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
788 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
789 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
790 "simple");
791
792 // delay posting reads until we're fully open
793 tasklet_schedule (&dev->bh);
794 if (info->manage_power) {
795 retval = info->manage_power(dev, 1);
796 if (retval < 0)
797 goto done;
798 usb_autopm_put_interface(dev->intf);
799 }
800 return retval;
801
802 done:
803 usb_autopm_put_interface(dev->intf);
804 done_nopm:
805 return retval;
806 }
807 EXPORT_SYMBOL_GPL(usbnet_open);
808
809 /*-------------------------------------------------------------------------*/
810
811 /* ethtool methods; minidrivers may need to add some more, but
812 * they'll probably want to use this base set.
813 */
814
815 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
816 {
817 struct usbnet *dev = netdev_priv(net);
818
819 if (!dev->mii.mdio_read)
820 return -EOPNOTSUPP;
821
822 return mii_ethtool_gset(&dev->mii, cmd);
823 }
824 EXPORT_SYMBOL_GPL(usbnet_get_settings);
825
826 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
827 {
828 struct usbnet *dev = netdev_priv(net);
829 int retval;
830
831 if (!dev->mii.mdio_write)
832 return -EOPNOTSUPP;
833
834 retval = mii_ethtool_sset(&dev->mii, cmd);
835
836 /* link speed/duplex might have changed */
837 if (dev->driver_info->link_reset)
838 dev->driver_info->link_reset(dev);
839
840 return retval;
841
842 }
843 EXPORT_SYMBOL_GPL(usbnet_set_settings);
844
845 u32 usbnet_get_link (struct net_device *net)
846 {
847 struct usbnet *dev = netdev_priv(net);
848
849 /* If a check_connect is defined, return its result */
850 if (dev->driver_info->check_connect)
851 return dev->driver_info->check_connect (dev) == 0;
852
853 /* if the device has mii operations, use those */
854 if (dev->mii.mdio_read)
855 return mii_link_ok(&dev->mii);
856
857 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
858 return ethtool_op_get_link(net);
859 }
860 EXPORT_SYMBOL_GPL(usbnet_get_link);
861
862 int usbnet_nway_reset(struct net_device *net)
863 {
864 struct usbnet *dev = netdev_priv(net);
865
866 if (!dev->mii.mdio_write)
867 return -EOPNOTSUPP;
868
869 return mii_nway_restart(&dev->mii);
870 }
871 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
872
873 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
874 {
875 struct usbnet *dev = netdev_priv(net);
876
877 strncpy (info->driver, dev->driver_name, sizeof info->driver);
878 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
879 strncpy (info->fw_version, dev->driver_info->description,
880 sizeof info->fw_version);
881 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
882 }
883 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
884
885 u32 usbnet_get_msglevel (struct net_device *net)
886 {
887 struct usbnet *dev = netdev_priv(net);
888
889 return dev->msg_enable;
890 }
891 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
892
893 void usbnet_set_msglevel (struct net_device *net, u32 level)
894 {
895 struct usbnet *dev = netdev_priv(net);
896
897 dev->msg_enable = level;
898 }
899 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
900
901 /* drivers may override default ethtool_ops in their bind() routine */
902 static const struct ethtool_ops usbnet_ethtool_ops = {
903 .get_settings = usbnet_get_settings,
904 .set_settings = usbnet_set_settings,
905 .get_link = usbnet_get_link,
906 .nway_reset = usbnet_nway_reset,
907 .get_drvinfo = usbnet_get_drvinfo,
908 .get_msglevel = usbnet_get_msglevel,
909 .set_msglevel = usbnet_set_msglevel,
910 };
911
912 /*-------------------------------------------------------------------------*/
913
914 /* work that cannot be done in interrupt context uses keventd.
915 *
916 * NOTE: with 2.5 we could do more of this using completion callbacks,
917 * especially now that control transfers can be queued.
918 */
919 static void
920 kevent (struct work_struct *work)
921 {
922 struct usbnet *dev =
923 container_of(work, struct usbnet, kevent);
924 int status;
925
926 /* usb_clear_halt() needs a thread context */
927 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
928 unlink_urbs (dev, &dev->txq);
929 status = usb_autopm_get_interface(dev->intf);
930 if (status < 0)
931 goto fail_pipe;
932 status = usb_clear_halt (dev->udev, dev->out);
933 usb_autopm_put_interface(dev->intf);
934 if (status < 0 &&
935 status != -EPIPE &&
936 status != -ESHUTDOWN) {
937 if (netif_msg_tx_err (dev))
938 fail_pipe:
939 netdev_err(dev->net, "can't clear tx halt, status %d\n",
940 status);
941 } else {
942 clear_bit (EVENT_TX_HALT, &dev->flags);
943 if (status != -ESHUTDOWN)
944 netif_wake_queue (dev->net);
945 }
946 }
947 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
948 unlink_urbs (dev, &dev->rxq);
949 status = usb_autopm_get_interface(dev->intf);
950 if (status < 0)
951 goto fail_halt;
952 status = usb_clear_halt (dev->udev, dev->in);
953 usb_autopm_put_interface(dev->intf);
954 if (status < 0 &&
955 status != -EPIPE &&
956 status != -ESHUTDOWN) {
957 if (netif_msg_rx_err (dev))
958 fail_halt:
959 netdev_err(dev->net, "can't clear rx halt, status %d\n",
960 status);
961 } else {
962 clear_bit (EVENT_RX_HALT, &dev->flags);
963 tasklet_schedule (&dev->bh);
964 }
965 }
966
967 /* tasklet could resubmit itself forever if memory is tight */
968 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
969 struct urb *urb = NULL;
970 int resched = 1;
971
972 if (netif_running (dev->net))
973 urb = usb_alloc_urb (0, GFP_KERNEL);
974 else
975 clear_bit (EVENT_RX_MEMORY, &dev->flags);
976 if (urb != NULL) {
977 clear_bit (EVENT_RX_MEMORY, &dev->flags);
978 status = usb_autopm_get_interface(dev->intf);
979 if (status < 0) {
980 usb_free_urb(urb);
981 goto fail_lowmem;
982 }
983 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
984 resched = 0;
985 usb_autopm_put_interface(dev->intf);
986 fail_lowmem:
987 if (resched)
988 tasklet_schedule (&dev->bh);
989 }
990 }
991
992 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
993 struct driver_info *info = dev->driver_info;
994 int retval = 0;
995
996 clear_bit (EVENT_LINK_RESET, &dev->flags);
997 status = usb_autopm_get_interface(dev->intf);
998 if (status < 0)
999 goto skip_reset;
1000 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1001 usb_autopm_put_interface(dev->intf);
1002 skip_reset:
1003 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1004 retval,
1005 dev->udev->bus->bus_name,
1006 dev->udev->devpath,
1007 info->description);
1008 } else {
1009 usb_autopm_put_interface(dev->intf);
1010 }
1011 }
1012
1013 if (dev->flags)
1014 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1015 }
1016
1017 /*-------------------------------------------------------------------------*/
1018
1019 static void tx_complete (struct urb *urb)
1020 {
1021 struct sk_buff *skb = (struct sk_buff *) urb->context;
1022 struct skb_data *entry = (struct skb_data *) skb->cb;
1023 struct usbnet *dev = entry->dev;
1024
1025 if (urb->status == 0) {
1026 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1027 dev->net->stats.tx_packets++;
1028 dev->net->stats.tx_bytes += entry->length;
1029 } else {
1030 dev->net->stats.tx_errors++;
1031
1032 switch (urb->status) {
1033 case -EPIPE:
1034 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1035 break;
1036
1037 /* software-driven interface shutdown */
1038 case -ECONNRESET: // async unlink
1039 case -ESHUTDOWN: // hardware gone
1040 break;
1041
1042 // like rx, tx gets controller i/o faults during khubd delays
1043 // and so it uses the same throttling mechanism.
1044 case -EPROTO:
1045 case -ETIME:
1046 case -EILSEQ:
1047 usb_mark_last_busy(dev->udev);
1048 if (!timer_pending (&dev->delay)) {
1049 mod_timer (&dev->delay,
1050 jiffies + THROTTLE_JIFFIES);
1051 netif_dbg(dev, link, dev->net,
1052 "tx throttle %d\n", urb->status);
1053 }
1054 netif_stop_queue (dev->net);
1055 break;
1056 default:
1057 netif_dbg(dev, tx_err, dev->net,
1058 "tx err %d\n", entry->urb->status);
1059 break;
1060 }
1061 }
1062
1063 usb_autopm_put_interface_async(dev->intf);
1064 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1065 }
1066
1067 /*-------------------------------------------------------------------------*/
1068
1069 void usbnet_tx_timeout (struct net_device *net)
1070 {
1071 struct usbnet *dev = netdev_priv(net);
1072
1073 unlink_urbs (dev, &dev->txq);
1074 tasklet_schedule (&dev->bh);
1075
1076 // FIXME: device recovery -- reset?
1077 }
1078 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1079
1080 /*-------------------------------------------------------------------------*/
1081
1082 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1083 struct net_device *net)
1084 {
1085 struct usbnet *dev = netdev_priv(net);
1086 int length;
1087 struct urb *urb = NULL;
1088 struct skb_data *entry;
1089 struct driver_info *info = dev->driver_info;
1090 unsigned long flags;
1091 int retval;
1092
1093 if (skb)
1094 skb_tx_timestamp(skb);
1095
1096 // some devices want funky USB-level framing, for
1097 // win32 driver (usually) and/or hardware quirks
1098 if (info->tx_fixup) {
1099 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1100 if (!skb) {
1101 if (netif_msg_tx_err(dev)) {
1102 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1103 goto drop;
1104 } else {
1105 /* cdc_ncm collected packet; waits for more */
1106 goto not_drop;
1107 }
1108 }
1109 }
1110 length = skb->len;
1111
1112 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1113 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1114 goto drop;
1115 }
1116
1117 entry = (struct skb_data *) skb->cb;
1118 entry->urb = urb;
1119 entry->dev = dev;
1120 entry->length = length;
1121
1122 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1123 skb->data, skb->len, tx_complete, skb);
1124
1125 /* don't assume the hardware handles USB_ZERO_PACKET
1126 * NOTE: strictly conforming cdc-ether devices should expect
1127 * the ZLP here, but ignore the one-byte packet.
1128 * NOTE2: CDC NCM specification is different from CDC ECM when
1129 * handling ZLP/short packets, so cdc_ncm driver will make short
1130 * packet itself if needed.
1131 */
1132 if (length % dev->maxpacket == 0) {
1133 if (!(info->flags & FLAG_SEND_ZLP)) {
1134 if (!(info->flags & FLAG_MULTI_PACKET)) {
1135 urb->transfer_buffer_length++;
1136 if (skb_tailroom(skb)) {
1137 skb->data[skb->len] = 0;
1138 __skb_put(skb, 1);
1139 }
1140 }
1141 } else
1142 urb->transfer_flags |= URB_ZERO_PACKET;
1143 }
1144
1145 spin_lock_irqsave(&dev->txq.lock, flags);
1146 retval = usb_autopm_get_interface_async(dev->intf);
1147 if (retval < 0) {
1148 spin_unlock_irqrestore(&dev->txq.lock, flags);
1149 goto drop;
1150 }
1151
1152 #ifdef CONFIG_PM
1153 /* if this triggers the device is still a sleep */
1154 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1155 /* transmission will be done in resume */
1156 usb_anchor_urb(urb, &dev->deferred);
1157 /* no use to process more packets */
1158 netif_stop_queue(net);
1159 spin_unlock_irqrestore(&dev->txq.lock, flags);
1160 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1161 goto deferred;
1162 }
1163 #endif
1164
1165 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1166 case -EPIPE:
1167 netif_stop_queue (net);
1168 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1169 usb_autopm_put_interface_async(dev->intf);
1170 break;
1171 default:
1172 usb_autopm_put_interface_async(dev->intf);
1173 netif_dbg(dev, tx_err, dev->net,
1174 "tx: submit urb err %d\n", retval);
1175 break;
1176 case 0:
1177 net->trans_start = jiffies;
1178 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1179 if (dev->txq.qlen >= TX_QLEN (dev))
1180 netif_stop_queue (net);
1181 }
1182 spin_unlock_irqrestore (&dev->txq.lock, flags);
1183
1184 if (retval) {
1185 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1186 drop:
1187 dev->net->stats.tx_dropped++;
1188 not_drop:
1189 if (skb)
1190 dev_kfree_skb_any (skb);
1191 usb_free_urb (urb);
1192 } else
1193 netif_dbg(dev, tx_queued, dev->net,
1194 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1195 #ifdef CONFIG_PM
1196 deferred:
1197 #endif
1198 return NETDEV_TX_OK;
1199 }
1200 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1201
1202 /*-------------------------------------------------------------------------*/
1203
1204 // tasklet (work deferred from completions, in_irq) or timer
1205
1206 static void usbnet_bh (unsigned long param)
1207 {
1208 struct usbnet *dev = (struct usbnet *) param;
1209 struct sk_buff *skb;
1210 struct skb_data *entry;
1211
1212 while ((skb = skb_dequeue (&dev->done))) {
1213 entry = (struct skb_data *) skb->cb;
1214 switch (entry->state) {
1215 case rx_done:
1216 entry->state = rx_cleanup;
1217 rx_process (dev, skb);
1218 continue;
1219 case tx_done:
1220 case rx_cleanup:
1221 usb_free_urb (entry->urb);
1222 dev_kfree_skb (skb);
1223 continue;
1224 default:
1225 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1226 }
1227 }
1228
1229 // waiting for all pending urbs to complete?
1230 if (dev->wait) {
1231 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1232 wake_up (dev->wait);
1233 }
1234
1235 // or are we maybe short a few urbs?
1236 } else if (netif_running (dev->net) &&
1237 netif_device_present (dev->net) &&
1238 !timer_pending (&dev->delay) &&
1239 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1240 int temp = dev->rxq.qlen;
1241 int qlen = RX_QLEN (dev);
1242
1243 if (temp < qlen) {
1244 struct urb *urb;
1245 int i;
1246
1247 // don't refill the queue all at once
1248 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1249 urb = usb_alloc_urb (0, GFP_ATOMIC);
1250 if (urb != NULL) {
1251 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1252 -ENOLINK)
1253 return;
1254 }
1255 }
1256 if (temp != dev->rxq.qlen)
1257 netif_dbg(dev, link, dev->net,
1258 "rxqlen %d --> %d\n",
1259 temp, dev->rxq.qlen);
1260 if (dev->rxq.qlen < qlen)
1261 tasklet_schedule (&dev->bh);
1262 }
1263 if (dev->txq.qlen < TX_QLEN (dev))
1264 netif_wake_queue (dev->net);
1265 }
1266 }
1267
1268
1269 /*-------------------------------------------------------------------------
1270 *
1271 * USB Device Driver support
1272 *
1273 *-------------------------------------------------------------------------*/
1274
1275 // precondition: never called in_interrupt
1276
1277 void usbnet_disconnect (struct usb_interface *intf)
1278 {
1279 struct usbnet *dev;
1280 struct usb_device *xdev;
1281 struct net_device *net;
1282
1283 dev = usb_get_intfdata(intf);
1284 usb_set_intfdata(intf, NULL);
1285 if (!dev)
1286 return;
1287
1288 xdev = interface_to_usbdev (intf);
1289
1290 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1291 intf->dev.driver->name,
1292 xdev->bus->bus_name, xdev->devpath,
1293 dev->driver_info->description);
1294
1295 net = dev->net;
1296 unregister_netdev (net);
1297
1298 cancel_work_sync(&dev->kevent);
1299
1300 if (dev->driver_info->unbind)
1301 dev->driver_info->unbind (dev, intf);
1302
1303 usb_kill_urb(dev->interrupt);
1304 usb_free_urb(dev->interrupt);
1305
1306 free_netdev(net);
1307 usb_put_dev (xdev);
1308 }
1309 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1310
1311 static const struct net_device_ops usbnet_netdev_ops = {
1312 .ndo_open = usbnet_open,
1313 .ndo_stop = usbnet_stop,
1314 .ndo_start_xmit = usbnet_start_xmit,
1315 .ndo_tx_timeout = usbnet_tx_timeout,
1316 .ndo_change_mtu = usbnet_change_mtu,
1317 .ndo_set_mac_address = eth_mac_addr,
1318 .ndo_validate_addr = eth_validate_addr,
1319 };
1320
1321 /*-------------------------------------------------------------------------*/
1322
1323 // precondition: never called in_interrupt
1324
1325 static struct device_type wlan_type = {
1326 .name = "wlan",
1327 };
1328
1329 static struct device_type wwan_type = {
1330 .name = "wwan",
1331 };
1332
1333 int
1334 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1335 {
1336 struct usbnet *dev;
1337 struct net_device *net;
1338 struct usb_host_interface *interface;
1339 struct driver_info *info;
1340 struct usb_device *xdev;
1341 int status;
1342 const char *name;
1343 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1344
1345 /* usbnet already took usb runtime pm, so have to enable the feature
1346 * for usb interface, otherwise usb_autopm_get_interface may return
1347 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1348 */
1349 if (!driver->supports_autosuspend) {
1350 driver->supports_autosuspend = 1;
1351 pm_runtime_enable(&udev->dev);
1352 }
1353
1354 name = udev->dev.driver->name;
1355 info = (struct driver_info *) prod->driver_info;
1356 if (!info) {
1357 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1358 return -ENODEV;
1359 }
1360 xdev = interface_to_usbdev (udev);
1361 interface = udev->cur_altsetting;
1362
1363 usb_get_dev (xdev);
1364
1365 status = -ENOMEM;
1366
1367 // set up our own records
1368 net = alloc_etherdev(sizeof(*dev));
1369 if (!net) {
1370 dbg ("can't kmalloc dev");
1371 goto out;
1372 }
1373
1374 /* netdev_printk() needs this so do it as early as possible */
1375 SET_NETDEV_DEV(net, &udev->dev);
1376
1377 dev = netdev_priv(net);
1378 dev->udev = xdev;
1379 dev->intf = udev;
1380 dev->driver_info = info;
1381 dev->driver_name = name;
1382 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1383 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1384 skb_queue_head_init (&dev->rxq);
1385 skb_queue_head_init (&dev->txq);
1386 skb_queue_head_init (&dev->done);
1387 skb_queue_head_init(&dev->rxq_pause);
1388 dev->bh.func = usbnet_bh;
1389 dev->bh.data = (unsigned long) dev;
1390 INIT_WORK (&dev->kevent, kevent);
1391 init_usb_anchor(&dev->deferred);
1392 dev->delay.function = usbnet_bh;
1393 dev->delay.data = (unsigned long) dev;
1394 init_timer (&dev->delay);
1395 mutex_init (&dev->phy_mutex);
1396
1397 dev->net = net;
1398 strcpy (net->name, "usb%d");
1399 memcpy (net->dev_addr, node_id, sizeof node_id);
1400
1401 /* rx and tx sides can use different message sizes;
1402 * bind() should set rx_urb_size in that case.
1403 */
1404 dev->hard_mtu = net->mtu + net->hard_header_len;
1405 #if 0
1406 // dma_supported() is deeply broken on almost all architectures
1407 // possible with some EHCI controllers
1408 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1409 net->features |= NETIF_F_HIGHDMA;
1410 #endif
1411
1412 net->netdev_ops = &usbnet_netdev_ops;
1413 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1414 net->ethtool_ops = &usbnet_ethtool_ops;
1415
1416 // allow device-specific bind/init procedures
1417 // NOTE net->name still not usable ...
1418 if (info->bind) {
1419 status = info->bind (dev, udev);
1420 if (status < 0)
1421 goto out1;
1422
1423 // heuristic: "usb%d" for links we know are two-host,
1424 // else "eth%d" when there's reasonable doubt. userspace
1425 // can rename the link if it knows better.
1426 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1427 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1428 (net->dev_addr [0] & 0x02) == 0))
1429 strcpy (net->name, "eth%d");
1430 /* WLAN devices should always be named "wlan%d" */
1431 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1432 strcpy(net->name, "wlan%d");
1433 /* WWAN devices should always be named "wwan%d" */
1434 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1435 strcpy(net->name, "wwan%d");
1436
1437 /* maybe the remote can't receive an Ethernet MTU */
1438 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1439 net->mtu = dev->hard_mtu - net->hard_header_len;
1440 } else if (!info->in || !info->out)
1441 status = usbnet_get_endpoints (dev, udev);
1442 else {
1443 dev->in = usb_rcvbulkpipe (xdev, info->in);
1444 dev->out = usb_sndbulkpipe (xdev, info->out);
1445 if (!(info->flags & FLAG_NO_SETINT))
1446 status = usb_set_interface (xdev,
1447 interface->desc.bInterfaceNumber,
1448 interface->desc.bAlternateSetting);
1449 else
1450 status = 0;
1451
1452 }
1453 if (status >= 0 && dev->status)
1454 status = init_status (dev, udev);
1455 if (status < 0)
1456 goto out3;
1457
1458 if (!dev->rx_urb_size)
1459 dev->rx_urb_size = dev->hard_mtu;
1460 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1461
1462 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1463 SET_NETDEV_DEVTYPE(net, &wlan_type);
1464 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1465 SET_NETDEV_DEVTYPE(net, &wwan_type);
1466
1467 status = register_netdev (net);
1468 if (status)
1469 goto out3;
1470 netif_info(dev, probe, dev->net,
1471 "register '%s' at usb-%s-%s, %s, %pM\n",
1472 udev->dev.driver->name,
1473 xdev->bus->bus_name, xdev->devpath,
1474 dev->driver_info->description,
1475 net->dev_addr);
1476
1477 // ok, it's ready to go.
1478 usb_set_intfdata (udev, dev);
1479
1480 netif_device_attach (net);
1481
1482 if (dev->driver_info->flags & FLAG_LINK_INTR)
1483 netif_carrier_off(net);
1484
1485 return 0;
1486
1487 out3:
1488 if (info->unbind)
1489 info->unbind (dev, udev);
1490 out1:
1491 free_netdev(net);
1492 out:
1493 usb_put_dev(xdev);
1494 return status;
1495 }
1496 EXPORT_SYMBOL_GPL(usbnet_probe);
1497
1498 /*-------------------------------------------------------------------------*/
1499
1500 /*
1501 * suspend the whole driver as soon as the first interface is suspended
1502 * resume only when the last interface is resumed
1503 */
1504
1505 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1506 {
1507 struct usbnet *dev = usb_get_intfdata(intf);
1508
1509 if (!dev->suspend_count++) {
1510 spin_lock_irq(&dev->txq.lock);
1511 /* don't autosuspend while transmitting */
1512 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1513 spin_unlock_irq(&dev->txq.lock);
1514 return -EBUSY;
1515 } else {
1516 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1517 spin_unlock_irq(&dev->txq.lock);
1518 }
1519 /*
1520 * accelerate emptying of the rx and queues, to avoid
1521 * having everything error out.
1522 */
1523 netif_device_detach (dev->net);
1524 usbnet_terminate_urbs(dev);
1525 usb_kill_urb(dev->interrupt);
1526
1527 /*
1528 * reattach so runtime management can use and
1529 * wake the device
1530 */
1531 netif_device_attach (dev->net);
1532 }
1533 return 0;
1534 }
1535 EXPORT_SYMBOL_GPL(usbnet_suspend);
1536
1537 int usbnet_resume (struct usb_interface *intf)
1538 {
1539 struct usbnet *dev = usb_get_intfdata(intf);
1540 struct sk_buff *skb;
1541 struct urb *res;
1542 int retval;
1543
1544 if (!--dev->suspend_count) {
1545 /* resume interrupt URBs */
1546 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1547 usb_submit_urb(dev->interrupt, GFP_NOIO);
1548
1549 spin_lock_irq(&dev->txq.lock);
1550 while ((res = usb_get_from_anchor(&dev->deferred))) {
1551
1552 skb = (struct sk_buff *)res->context;
1553 retval = usb_submit_urb(res, GFP_ATOMIC);
1554 if (retval < 0) {
1555 dev_kfree_skb_any(skb);
1556 usb_free_urb(res);
1557 usb_autopm_put_interface_async(dev->intf);
1558 } else {
1559 dev->net->trans_start = jiffies;
1560 __skb_queue_tail(&dev->txq, skb);
1561 }
1562 }
1563
1564 smp_mb();
1565 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1566 spin_unlock_irq(&dev->txq.lock);
1567
1568 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1569 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1570 netif_start_queue(dev->net);
1571 tasklet_schedule (&dev->bh);
1572 }
1573 }
1574 return 0;
1575 }
1576 EXPORT_SYMBOL_GPL(usbnet_resume);
1577
1578
1579 /*-------------------------------------------------------------------------*/
1580
1581 static int __init usbnet_init(void)
1582 {
1583 /* Compiler should optimize this out. */
1584 BUILD_BUG_ON(
1585 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1586
1587 random_ether_addr(node_id);
1588 return 0;
1589 }
1590 module_init(usbnet_init);
1591
1592 static void __exit usbnet_exit(void)
1593 {
1594 }
1595 module_exit(usbnet_exit);
1596
1597 MODULE_AUTHOR("David Brownell");
1598 MODULE_DESCRIPTION("USB network driver framework");
1599 MODULE_LICENSE("GPL");