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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / usb / usbnet.c
blobce395fe5de268934b5def60f34462b2f3e74ac84
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 status = netif_rx (skb);
242 if (status != NET_RX_SUCCESS)
243 netif_dbg(dev, rx_err, dev->net,
244 "netif_rx status %d\n", status);
245 }
246 EXPORT_SYMBOL_GPL(usbnet_skb_return);
247
248 \f
249 /*-------------------------------------------------------------------------
250 *
251 * Network Device Driver (peer link to "Host Device", from USB host)
252 *
253 *-------------------------------------------------------------------------*/
254
255 int usbnet_change_mtu (struct net_device *net, int new_mtu)
256 {
257 struct usbnet *dev = netdev_priv(net);
258 int ll_mtu = new_mtu + net->hard_header_len;
259 int old_hard_mtu = dev->hard_mtu;
260 int old_rx_urb_size = dev->rx_urb_size;
261
262 if (new_mtu <= 0)
263 return -EINVAL;
264 // no second zero-length packet read wanted after mtu-sized packets
265 if ((ll_mtu % dev->maxpacket) == 0)
266 return -EDOM;
267 net->mtu = new_mtu;
268
269 dev->hard_mtu = net->mtu + net->hard_header_len;
270 if (dev->rx_urb_size == old_hard_mtu) {
271 dev->rx_urb_size = dev->hard_mtu;
272 if (dev->rx_urb_size > old_rx_urb_size)
273 usbnet_unlink_rx_urbs(dev);
274 }
275
276 return 0;
277 }
278 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
279
280 /*-------------------------------------------------------------------------*/
281
282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
284 */
285
286 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
287 {
288 unsigned long flags;
289
290 spin_lock_irqsave(&list->lock, flags);
291 __skb_unlink(skb, list);
292 spin_unlock(&list->lock);
293 spin_lock(&dev->done.lock);
294 __skb_queue_tail(&dev->done, skb);
295 if (dev->done.qlen == 1)
296 tasklet_schedule(&dev->bh);
297 spin_unlock_irqrestore(&dev->done.lock, flags);
298 }
299
300 /* some work can't be done in tasklets, so we use keventd
301 *
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
304 */
305 void usbnet_defer_kevent (struct usbnet *dev, int work)
306 {
307 set_bit (work, &dev->flags);
308 if (!schedule_work (&dev->kevent))
309 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
310 else
311 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
312 }
313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
314
315 /*-------------------------------------------------------------------------*/
316
317 static void rx_complete (struct urb *urb);
318
319 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
320 {
321 struct sk_buff *skb;
322 struct skb_data *entry;
323 int retval = 0;
324 unsigned long lockflags;
325 size_t size = dev->rx_urb_size;
326
327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
330 usb_free_urb (urb);
331 return -ENOMEM;
332 }
333 skb_reserve (skb, NET_IP_ALIGN);
334
335 entry = (struct skb_data *) skb->cb;
336 entry->urb = urb;
337 entry->dev = dev;
338 entry->state = rx_start;
339 entry->length = 0;
340
341 usb_fill_bulk_urb (urb, dev->udev, dev->in,
342 skb->data, size, rx_complete, skb);
343
344 spin_lock_irqsave (&dev->rxq.lock, lockflags);
345
346 if (netif_running (dev->net) &&
347 netif_device_present (dev->net) &&
348 !test_bit (EVENT_RX_HALT, &dev->flags) &&
349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
351 case -EPIPE:
352 usbnet_defer_kevent (dev, EVENT_RX_HALT);
353 break;
354 case -ENOMEM:
355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
356 break;
357 case -ENODEV:
358 netif_dbg(dev, ifdown, dev->net, "device gone\n");
359 netif_device_detach (dev->net);
360 break;
361 case -EHOSTUNREACH:
362 retval = -ENOLINK;
363 break;
364 default:
365 netif_dbg(dev, rx_err, dev->net,
366 "rx submit, %d\n", retval);
367 tasklet_schedule (&dev->bh);
368 break;
369 case 0:
370 __skb_queue_tail (&dev->rxq, skb);
371 }
372 } else {
373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
374 retval = -ENOLINK;
375 }
376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
377 if (retval) {
378 dev_kfree_skb_any (skb);
379 usb_free_urb (urb);
380 }
381 return retval;
382 }
383
384
385 /*-------------------------------------------------------------------------*/
386
387 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
388 {
389 if (dev->driver_info->rx_fixup &&
390 !dev->driver_info->rx_fixup (dev, skb)) {
391 /* With RX_ASSEMBLE, rx_fixup() must update counters */
392 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
393 dev->net->stats.rx_errors++;
394 goto done;
395 }
396 // else network stack removes extra byte if we forced a short packet
397
398 if (skb->len) {
399 /* all data was already cloned from skb inside the driver */
400 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
401 dev_kfree_skb_any(skb);
402 else
403 usbnet_skb_return(dev, skb);
404 return;
405 }
406
407 netif_dbg(dev, rx_err, dev->net, "drop\n");
408 dev->net->stats.rx_errors++;
409 done:
410 skb_queue_tail(&dev->done, skb);
411 }
412
413 /*-------------------------------------------------------------------------*/
414
415 static void rx_complete (struct urb *urb)
416 {
417 struct sk_buff *skb = (struct sk_buff *) urb->context;
418 struct skb_data *entry = (struct skb_data *) skb->cb;
419 struct usbnet *dev = entry->dev;
420 int urb_status = urb->status;
421
422 skb_put (skb, urb->actual_length);
423 entry->state = rx_done;
424 entry->urb = NULL;
425
426 switch (urb_status) {
427 /* success */
428 case 0:
429 if (skb->len < dev->net->hard_header_len) {
430 entry->state = rx_cleanup;
431 dev->net->stats.rx_errors++;
432 dev->net->stats.rx_length_errors++;
433 netif_dbg(dev, rx_err, dev->net,
434 "rx length %d\n", skb->len);
435 }
436 break;
437
438 /* stalls need manual reset. this is rare ... except that
439 * when going through USB 2.0 TTs, unplug appears this way.
440 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
441 * storm, recovering as needed.
442 */
443 case -EPIPE:
444 dev->net->stats.rx_errors++;
445 usbnet_defer_kevent (dev, EVENT_RX_HALT);
446 // FALLTHROUGH
447
448 /* software-driven interface shutdown */
449 case -ECONNRESET: /* async unlink */
450 case -ESHUTDOWN: /* hardware gone */
451 netif_dbg(dev, ifdown, dev->net,
452 "rx shutdown, code %d\n", urb_status);
453 goto block;
454
455 /* we get controller i/o faults during khubd disconnect() delays.
456 * throttle down resubmits, to avoid log floods; just temporarily,
457 * so we still recover when the fault isn't a khubd delay.
458 */
459 case -EPROTO:
460 case -ETIME:
461 case -EILSEQ:
462 dev->net->stats.rx_errors++;
463 if (!timer_pending (&dev->delay)) {
464 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
465 netif_dbg(dev, link, dev->net,
466 "rx throttle %d\n", urb_status);
467 }
468 block:
469 entry->state = rx_cleanup;
470 entry->urb = urb;
471 urb = NULL;
472 break;
473
474 /* data overrun ... flush fifo? */
475 case -EOVERFLOW:
476 dev->net->stats.rx_over_errors++;
477 // FALLTHROUGH
478
479 default:
480 entry->state = rx_cleanup;
481 dev->net->stats.rx_errors++;
482 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
483 break;
484 }
485
486 defer_bh(dev, skb, &dev->rxq);
487
488 if (urb) {
489 if (netif_running (dev->net) &&
490 !test_bit (EVENT_RX_HALT, &dev->flags)) {
491 rx_submit (dev, urb, GFP_ATOMIC);
492 return;
493 }
494 usb_free_urb (urb);
495 }
496 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
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 netif_dbg(dev, ifdown, dev->net,
514 "intr shutdown, code %d\n", status);
515 return;
516
517 /* NOTE: not throttling like RX/TX, since this endpoint
518 * already polls infrequently
519 */
520 default:
521 netdev_dbg(dev->net, "intr status %d\n", 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)
531 netif_err(dev, timer, dev->net,
532 "intr resubmit --> %d\n", status);
533 }
534
535 /*-------------------------------------------------------------------------*/
536 void usbnet_pause_rx(struct usbnet *dev)
537 {
538 set_bit(EVENT_RX_PAUSED, &dev->flags);
539
540 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
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 netif_dbg(dev, rx_status, dev->net,
559 "paused rx queue disabled, %d skbs requeued\n", 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 netdev_dbg(dev->net, "unlink urb err, %d\n", 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(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
633 set_current_state(TASK_UNINTERRUPTIBLE);
634 netif_dbg(dev, ifdown, dev->net,
635 "waited for %d urb completions\n", temp);
636 }
637 set_current_state(TASK_RUNNING);
638 dev->wait = NULL;
639 remove_wait_queue(&unlink_wakeup, &wait);
640 }
641
642 int usbnet_stop (struct net_device *net)
643 {
644 struct usbnet *dev = netdev_priv(net);
645 struct driver_info *info = dev->driver_info;
646 int retval;
647
648 clear_bit(EVENT_DEV_OPEN, &dev->flags);
649 netif_stop_queue (net);
650
651 netif_info(dev, ifdown, dev->net,
652 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
653 net->stats.rx_packets, net->stats.tx_packets,
654 net->stats.rx_errors, net->stats.tx_errors);
655
656 /* allow minidriver to stop correctly (wireless devices to turn off
657 * radio etc) */
658 if (info->stop) {
659 retval = info->stop(dev);
660 if (retval < 0)
661 netif_info(dev, ifdown, dev->net,
662 "stop fail (%d) usbnet usb-%s-%s, %s\n",
663 retval,
664 dev->udev->bus->bus_name, dev->udev->devpath,
665 info->description);
666 }
667
668 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
669 usbnet_terminate_urbs(dev);
670
671 usb_kill_urb(dev->interrupt);
672
673 usbnet_purge_paused_rxq(dev);
674
675 /* deferred work (task, timer, softirq) must also stop.
676 * can't flush_scheduled_work() until we drop rtnl (later),
677 * else workers could deadlock; so make workers a NOP.
678 */
679 dev->flags = 0;
680 del_timer_sync (&dev->delay);
681 tasklet_kill (&dev->bh);
682 if (info->manage_power)
683 info->manage_power(dev, 0);
684 else
685 usb_autopm_put_interface(dev->intf);
686
687 return 0;
688 }
689 EXPORT_SYMBOL_GPL(usbnet_stop);
690
691 /*-------------------------------------------------------------------------*/
692
693 // posts reads, and enables write queuing
694
695 // precondition: never called in_interrupt
696
697 int usbnet_open (struct net_device *net)
698 {
699 struct usbnet *dev = netdev_priv(net);
700 int retval;
701 struct driver_info *info = dev->driver_info;
702
703 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
704 netif_info(dev, ifup, dev->net,
705 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
706 retval,
707 dev->udev->bus->bus_name,
708 dev->udev->devpath,
709 info->description);
710 goto done_nopm;
711 }
712
713 // put into "known safe" state
714 if (info->reset && (retval = info->reset (dev)) < 0) {
715 netif_info(dev, ifup, dev->net,
716 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
717 retval,
718 dev->udev->bus->bus_name,
719 dev->udev->devpath,
720 info->description);
721 goto done;
722 }
723
724 // insist peer be connected
725 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
726 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
727 goto done;
728 }
729
730 /* start any status interrupt transfer */
731 if (dev->interrupt) {
732 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
733 if (retval < 0) {
734 netif_err(dev, ifup, dev->net,
735 "intr submit %d\n", retval);
736 goto done;
737 }
738 }
739
740 set_bit(EVENT_DEV_OPEN, &dev->flags);
741 netif_start_queue (net);
742 netif_info(dev, ifup, dev->net,
743 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
744 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
745 dev->net->mtu,
746 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
747 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
748 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
749 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
750 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
751 "simple");
752
753 // delay posting reads until we're fully open
754 tasklet_schedule (&dev->bh);
755 if (info->manage_power) {
756 retval = info->manage_power(dev, 1);
757 if (retval < 0)
758 goto done;
759 usb_autopm_put_interface(dev->intf);
760 }
761 return retval;
762
763 done:
764 usb_autopm_put_interface(dev->intf);
765 done_nopm:
766 return retval;
767 }
768 EXPORT_SYMBOL_GPL(usbnet_open);
769
770 /*-------------------------------------------------------------------------*/
771
772 /* ethtool methods; minidrivers may need to add some more, but
773 * they'll probably want to use this base set.
774 */
775
776 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
777 {
778 struct usbnet *dev = netdev_priv(net);
779
780 if (!dev->mii.mdio_read)
781 return -EOPNOTSUPP;
782
783 return mii_ethtool_gset(&dev->mii, cmd);
784 }
785 EXPORT_SYMBOL_GPL(usbnet_get_settings);
786
787 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
788 {
789 struct usbnet *dev = netdev_priv(net);
790 int retval;
791
792 if (!dev->mii.mdio_write)
793 return -EOPNOTSUPP;
794
795 retval = mii_ethtool_sset(&dev->mii, cmd);
796
797 /* link speed/duplex might have changed */
798 if (dev->driver_info->link_reset)
799 dev->driver_info->link_reset(dev);
800
801 return retval;
802
803 }
804 EXPORT_SYMBOL_GPL(usbnet_set_settings);
805
806 u32 usbnet_get_link (struct net_device *net)
807 {
808 struct usbnet *dev = netdev_priv(net);
809
810 /* If a check_connect is defined, return its result */
811 if (dev->driver_info->check_connect)
812 return dev->driver_info->check_connect (dev) == 0;
813
814 /* if the device has mii operations, use those */
815 if (dev->mii.mdio_read)
816 return mii_link_ok(&dev->mii);
817
818 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
819 return ethtool_op_get_link(net);
820 }
821 EXPORT_SYMBOL_GPL(usbnet_get_link);
822
823 int usbnet_nway_reset(struct net_device *net)
824 {
825 struct usbnet *dev = netdev_priv(net);
826
827 if (!dev->mii.mdio_write)
828 return -EOPNOTSUPP;
829
830 return mii_nway_restart(&dev->mii);
831 }
832 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
833
834 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
835 {
836 struct usbnet *dev = netdev_priv(net);
837
838 strncpy (info->driver, dev->driver_name, sizeof info->driver);
839 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
840 strncpy (info->fw_version, dev->driver_info->description,
841 sizeof info->fw_version);
842 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
843 }
844 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
845
846 u32 usbnet_get_msglevel (struct net_device *net)
847 {
848 struct usbnet *dev = netdev_priv(net);
849
850 return dev->msg_enable;
851 }
852 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
853
854 void usbnet_set_msglevel (struct net_device *net, u32 level)
855 {
856 struct usbnet *dev = netdev_priv(net);
857
858 dev->msg_enable = level;
859 }
860 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
861
862 /* drivers may override default ethtool_ops in their bind() routine */
863 static const struct ethtool_ops usbnet_ethtool_ops = {
864 .get_settings = usbnet_get_settings,
865 .set_settings = usbnet_set_settings,
866 .get_link = usbnet_get_link,
867 .nway_reset = usbnet_nway_reset,
868 .get_drvinfo = usbnet_get_drvinfo,
869 .get_msglevel = usbnet_get_msglevel,
870 .set_msglevel = usbnet_set_msglevel,
871 };
872
873 /*-------------------------------------------------------------------------*/
874
875 /* work that cannot be done in interrupt context uses keventd.
876 *
877 * NOTE: with 2.5 we could do more of this using completion callbacks,
878 * especially now that control transfers can be queued.
879 */
880 static void
881 kevent (struct work_struct *work)
882 {
883 struct usbnet *dev =
884 container_of(work, struct usbnet, kevent);
885 int status;
886
887 /* usb_clear_halt() needs a thread context */
888 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
889 unlink_urbs (dev, &dev->txq);
890 status = usb_autopm_get_interface(dev->intf);
891 if (status < 0)
892 goto fail_pipe;
893 status = usb_clear_halt (dev->udev, dev->out);
894 usb_autopm_put_interface(dev->intf);
895 if (status < 0 &&
896 status != -EPIPE &&
897 status != -ESHUTDOWN) {
898 if (netif_msg_tx_err (dev))
899 fail_pipe:
900 netdev_err(dev->net, "can't clear tx halt, status %d\n",
901 status);
902 } else {
903 clear_bit (EVENT_TX_HALT, &dev->flags);
904 if (status != -ESHUTDOWN)
905 netif_wake_queue (dev->net);
906 }
907 }
908 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
909 unlink_urbs (dev, &dev->rxq);
910 status = usb_autopm_get_interface(dev->intf);
911 if (status < 0)
912 goto fail_halt;
913 status = usb_clear_halt (dev->udev, dev->in);
914 usb_autopm_put_interface(dev->intf);
915 if (status < 0 &&
916 status != -EPIPE &&
917 status != -ESHUTDOWN) {
918 if (netif_msg_rx_err (dev))
919 fail_halt:
920 netdev_err(dev->net, "can't clear rx halt, status %d\n",
921 status);
922 } else {
923 clear_bit (EVENT_RX_HALT, &dev->flags);
924 tasklet_schedule (&dev->bh);
925 }
926 }
927
928 /* tasklet could resubmit itself forever if memory is tight */
929 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
930 struct urb *urb = NULL;
931 int resched = 1;
932
933 if (netif_running (dev->net))
934 urb = usb_alloc_urb (0, GFP_KERNEL);
935 else
936 clear_bit (EVENT_RX_MEMORY, &dev->flags);
937 if (urb != NULL) {
938 clear_bit (EVENT_RX_MEMORY, &dev->flags);
939 status = usb_autopm_get_interface(dev->intf);
940 if (status < 0) {
941 usb_free_urb(urb);
942 goto fail_lowmem;
943 }
944 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
945 resched = 0;
946 usb_autopm_put_interface(dev->intf);
947 fail_lowmem:
948 if (resched)
949 tasklet_schedule (&dev->bh);
950 }
951 }
952
953 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
954 struct driver_info *info = dev->driver_info;
955 int retval = 0;
956
957 clear_bit (EVENT_LINK_RESET, &dev->flags);
958 status = usb_autopm_get_interface(dev->intf);
959 if (status < 0)
960 goto skip_reset;
961 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
962 usb_autopm_put_interface(dev->intf);
963 skip_reset:
964 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
965 retval,
966 dev->udev->bus->bus_name,
967 dev->udev->devpath,
968 info->description);
969 } else {
970 usb_autopm_put_interface(dev->intf);
971 }
972 }
973
974 if (dev->flags)
975 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
976 }
977
978 /*-------------------------------------------------------------------------*/
979
980 static void tx_complete (struct urb *urb)
981 {
982 struct sk_buff *skb = (struct sk_buff *) urb->context;
983 struct skb_data *entry = (struct skb_data *) skb->cb;
984 struct usbnet *dev = entry->dev;
985
986 if (urb->status == 0) {
987 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
988 dev->net->stats.tx_packets++;
989 dev->net->stats.tx_bytes += entry->length;
990 } else {
991 dev->net->stats.tx_errors++;
992
993 switch (urb->status) {
994 case -EPIPE:
995 usbnet_defer_kevent (dev, EVENT_TX_HALT);
996 break;
997
998 /* software-driven interface shutdown */
999 case -ECONNRESET: // async unlink
1000 case -ESHUTDOWN: // hardware gone
1001 break;
1002
1003 // like rx, tx gets controller i/o faults during khubd delays
1004 // and so it uses the same throttling mechanism.
1005 case -EPROTO:
1006 case -ETIME:
1007 case -EILSEQ:
1008 usb_mark_last_busy(dev->udev);
1009 if (!timer_pending (&dev->delay)) {
1010 mod_timer (&dev->delay,
1011 jiffies + THROTTLE_JIFFIES);
1012 netif_dbg(dev, link, dev->net,
1013 "tx throttle %d\n", urb->status);
1014 }
1015 netif_stop_queue (dev->net);
1016 break;
1017 default:
1018 netif_dbg(dev, tx_err, dev->net,
1019 "tx err %d\n", entry->urb->status);
1020 break;
1021 }
1022 }
1023
1024 usb_autopm_put_interface_async(dev->intf);
1025 urb->dev = NULL;
1026 entry->state = tx_done;
1027 defer_bh(dev, skb, &dev->txq);
1028 }
1029
1030 /*-------------------------------------------------------------------------*/
1031
1032 void usbnet_tx_timeout (struct net_device *net)
1033 {
1034 struct usbnet *dev = netdev_priv(net);
1035
1036 unlink_urbs (dev, &dev->txq);
1037 tasklet_schedule (&dev->bh);
1038
1039 // FIXME: device recovery -- reset?
1040 }
1041 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1042
1043 /*-------------------------------------------------------------------------*/
1044
1045 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1046 struct net_device *net)
1047 {
1048 struct usbnet *dev = netdev_priv(net);
1049 int length;
1050 struct urb *urb = NULL;
1051 struct skb_data *entry;
1052 struct driver_info *info = dev->driver_info;
1053 unsigned long flags;
1054 int retval;
1055
1056 // some devices want funky USB-level framing, for
1057 // win32 driver (usually) and/or hardware quirks
1058 if (info->tx_fixup) {
1059 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1060 if (!skb) {
1061 if (netif_msg_tx_err(dev)) {
1062 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1063 goto drop;
1064 } else {
1065 /* cdc_ncm collected packet; waits for more */
1066 goto not_drop;
1067 }
1068 }
1069 }
1070 length = skb->len;
1071
1072 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1073 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1074 goto drop;
1075 }
1076
1077 entry = (struct skb_data *) skb->cb;
1078 entry->urb = urb;
1079 entry->dev = dev;
1080 entry->state = tx_start;
1081 entry->length = length;
1082
1083 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1084 skb->data, skb->len, tx_complete, skb);
1085
1086 /* don't assume the hardware handles USB_ZERO_PACKET
1087 * NOTE: strictly conforming cdc-ether devices should expect
1088 * the ZLP here, but ignore the one-byte packet.
1089 * NOTE2: CDC NCM specification is different from CDC ECM when
1090 * handling ZLP/short packets, so cdc_ncm driver will make short
1091 * packet itself if needed.
1092 */
1093 if (length % dev->maxpacket == 0) {
1094 if (!(info->flags & FLAG_SEND_ZLP)) {
1095 if (!(info->flags & FLAG_MULTI_PACKET)) {
1096 urb->transfer_buffer_length++;
1097 if (skb_tailroom(skb)) {
1098 skb->data[skb->len] = 0;
1099 __skb_put(skb, 1);
1100 }
1101 }
1102 } else
1103 urb->transfer_flags |= URB_ZERO_PACKET;
1104 }
1105
1106 spin_lock_irqsave(&dev->txq.lock, flags);
1107 retval = usb_autopm_get_interface_async(dev->intf);
1108 if (retval < 0) {
1109 spin_unlock_irqrestore(&dev->txq.lock, flags);
1110 goto drop;
1111 }
1112
1113 #ifdef CONFIG_PM
1114 /* if this triggers the device is still a sleep */
1115 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1116 /* transmission will be done in resume */
1117 usb_anchor_urb(urb, &dev->deferred);
1118 /* no use to process more packets */
1119 netif_stop_queue(net);
1120 spin_unlock_irqrestore(&dev->txq.lock, flags);
1121 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1122 goto deferred;
1123 }
1124 #endif
1125
1126 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1127 case -EPIPE:
1128 netif_stop_queue (net);
1129 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1130 usb_autopm_put_interface_async(dev->intf);
1131 break;
1132 default:
1133 usb_autopm_put_interface_async(dev->intf);
1134 netif_dbg(dev, tx_err, dev->net,
1135 "tx: submit urb err %d\n", retval);
1136 break;
1137 case 0:
1138 net->trans_start = jiffies;
1139 __skb_queue_tail (&dev->txq, skb);
1140 if (dev->txq.qlen >= TX_QLEN (dev))
1141 netif_stop_queue (net);
1142 }
1143 spin_unlock_irqrestore (&dev->txq.lock, flags);
1144
1145 if (retval) {
1146 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1147 drop:
1148 dev->net->stats.tx_dropped++;
1149 not_drop:
1150 if (skb)
1151 dev_kfree_skb_any (skb);
1152 usb_free_urb (urb);
1153 } else
1154 netif_dbg(dev, tx_queued, dev->net,
1155 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1156 #ifdef CONFIG_PM
1157 deferred:
1158 #endif
1159 return NETDEV_TX_OK;
1160 }
1161 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1162
1163 /*-------------------------------------------------------------------------*/
1164
1165 // tasklet (work deferred from completions, in_irq) or timer
1166
1167 static void usbnet_bh (unsigned long param)
1168 {
1169 struct usbnet *dev = (struct usbnet *) param;
1170 struct sk_buff *skb;
1171 struct skb_data *entry;
1172
1173 while ((skb = skb_dequeue (&dev->done))) {
1174 entry = (struct skb_data *) skb->cb;
1175 switch (entry->state) {
1176 case rx_done:
1177 entry->state = rx_cleanup;
1178 rx_process (dev, skb);
1179 continue;
1180 case tx_done:
1181 case rx_cleanup:
1182 usb_free_urb (entry->urb);
1183 dev_kfree_skb (skb);
1184 continue;
1185 default:
1186 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1187 }
1188 }
1189
1190 // waiting for all pending urbs to complete?
1191 if (dev->wait) {
1192 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1193 wake_up (dev->wait);
1194 }
1195
1196 // or are we maybe short a few urbs?
1197 } else if (netif_running (dev->net) &&
1198 netif_device_present (dev->net) &&
1199 !timer_pending (&dev->delay) &&
1200 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1201 int temp = dev->rxq.qlen;
1202 int qlen = RX_QLEN (dev);
1203
1204 if (temp < qlen) {
1205 struct urb *urb;
1206 int i;
1207
1208 // don't refill the queue all at once
1209 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1210 urb = usb_alloc_urb (0, GFP_ATOMIC);
1211 if (urb != NULL) {
1212 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1213 -ENOLINK)
1214 return;
1215 }
1216 }
1217 if (temp != dev->rxq.qlen)
1218 netif_dbg(dev, link, dev->net,
1219 "rxqlen %d --> %d\n",
1220 temp, dev->rxq.qlen);
1221 if (dev->rxq.qlen < qlen)
1222 tasklet_schedule (&dev->bh);
1223 }
1224 if (dev->txq.qlen < TX_QLEN (dev))
1225 netif_wake_queue (dev->net);
1226 }
1227 }
1228
1229
1230 /*-------------------------------------------------------------------------
1231 *
1232 * USB Device Driver support
1233 *
1234 *-------------------------------------------------------------------------*/
1235
1236 // precondition: never called in_interrupt
1237
1238 void usbnet_disconnect (struct usb_interface *intf)
1239 {
1240 struct usbnet *dev;
1241 struct usb_device *xdev;
1242 struct net_device *net;
1243
1244 dev = usb_get_intfdata(intf);
1245 usb_set_intfdata(intf, NULL);
1246 if (!dev)
1247 return;
1248
1249 xdev = interface_to_usbdev (intf);
1250
1251 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1252 intf->dev.driver->name,
1253 xdev->bus->bus_name, xdev->devpath,
1254 dev->driver_info->description);
1255
1256 net = dev->net;
1257 unregister_netdev (net);
1258
1259 cancel_work_sync(&dev->kevent);
1260
1261 if (dev->driver_info->unbind)
1262 dev->driver_info->unbind (dev, intf);
1263
1264 usb_kill_urb(dev->interrupt);
1265 usb_free_urb(dev->interrupt);
1266
1267 free_netdev(net);
1268 usb_put_dev (xdev);
1269 }
1270 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1271
1272 static const struct net_device_ops usbnet_netdev_ops = {
1273 .ndo_open = usbnet_open,
1274 .ndo_stop = usbnet_stop,
1275 .ndo_start_xmit = usbnet_start_xmit,
1276 .ndo_tx_timeout = usbnet_tx_timeout,
1277 .ndo_change_mtu = usbnet_change_mtu,
1278 .ndo_set_mac_address = eth_mac_addr,
1279 .ndo_validate_addr = eth_validate_addr,
1280 };
1281
1282 /*-------------------------------------------------------------------------*/
1283
1284 // precondition: never called in_interrupt
1285
1286 static struct device_type wlan_type = {
1287 .name = "wlan",
1288 };
1289
1290 static struct device_type wwan_type = {
1291 .name = "wwan",
1292 };
1293
1294 int
1295 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1296 {
1297 struct usbnet *dev;
1298 struct net_device *net;
1299 struct usb_host_interface *interface;
1300 struct driver_info *info;
1301 struct usb_device *xdev;
1302 int status;
1303 const char *name;
1304 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1305
1306 /* usbnet already took usb runtime pm, so have to enable the feature
1307 * for usb interface, otherwise usb_autopm_get_interface may return
1308 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1309 */
1310 if (!driver->supports_autosuspend) {
1311 driver->supports_autosuspend = 1;
1312 pm_runtime_enable(&udev->dev);
1313 }
1314
1315 name = udev->dev.driver->name;
1316 info = (struct driver_info *) prod->driver_info;
1317 if (!info) {
1318 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1319 return -ENODEV;
1320 }
1321 xdev = interface_to_usbdev (udev);
1322 interface = udev->cur_altsetting;
1323
1324 usb_get_dev (xdev);
1325
1326 status = -ENOMEM;
1327
1328 // set up our own records
1329 net = alloc_etherdev(sizeof(*dev));
1330 if (!net) {
1331 dbg ("can't kmalloc dev");
1332 goto out;
1333 }
1334
1335 /* netdev_printk() needs this so do it as early as possible */
1336 SET_NETDEV_DEV(net, &udev->dev);
1337
1338 dev = netdev_priv(net);
1339 dev->udev = xdev;
1340 dev->intf = udev;
1341 dev->driver_info = info;
1342 dev->driver_name = name;
1343 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1344 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1345 skb_queue_head_init (&dev->rxq);
1346 skb_queue_head_init (&dev->txq);
1347 skb_queue_head_init (&dev->done);
1348 skb_queue_head_init(&dev->rxq_pause);
1349 dev->bh.func = usbnet_bh;
1350 dev->bh.data = (unsigned long) dev;
1351 INIT_WORK (&dev->kevent, kevent);
1352 init_usb_anchor(&dev->deferred);
1353 dev->delay.function = usbnet_bh;
1354 dev->delay.data = (unsigned long) dev;
1355 init_timer (&dev->delay);
1356 mutex_init (&dev->phy_mutex);
1357
1358 dev->net = net;
1359 strcpy (net->name, "usb%d");
1360 memcpy (net->dev_addr, node_id, sizeof node_id);
1361
1362 /* rx and tx sides can use different message sizes;
1363 * bind() should set rx_urb_size in that case.
1364 */
1365 dev->hard_mtu = net->mtu + net->hard_header_len;
1366 #if 0
1367 // dma_supported() is deeply broken on almost all architectures
1368 // possible with some EHCI controllers
1369 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1370 net->features |= NETIF_F_HIGHDMA;
1371 #endif
1372
1373 net->netdev_ops = &usbnet_netdev_ops;
1374 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1375 net->ethtool_ops = &usbnet_ethtool_ops;
1376
1377 // allow device-specific bind/init procedures
1378 // NOTE net->name still not usable ...
1379 if (info->bind) {
1380 status = info->bind (dev, udev);
1381 if (status < 0)
1382 goto out1;
1383
1384 // heuristic: "usb%d" for links we know are two-host,
1385 // else "eth%d" when there's reasonable doubt. userspace
1386 // can rename the link if it knows better.
1387 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1388 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1389 (net->dev_addr [0] & 0x02) == 0))
1390 strcpy (net->name, "eth%d");
1391 /* WLAN devices should always be named "wlan%d" */
1392 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1393 strcpy(net->name, "wlan%d");
1394 /* WWAN devices should always be named "wwan%d" */
1395 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1396 strcpy(net->name, "wwan%d");
1397
1398 /* maybe the remote can't receive an Ethernet MTU */
1399 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1400 net->mtu = dev->hard_mtu - net->hard_header_len;
1401 } else if (!info->in || !info->out)
1402 status = usbnet_get_endpoints (dev, udev);
1403 else {
1404 dev->in = usb_rcvbulkpipe (xdev, info->in);
1405 dev->out = usb_sndbulkpipe (xdev, info->out);
1406 if (!(info->flags & FLAG_NO_SETINT))
1407 status = usb_set_interface (xdev,
1408 interface->desc.bInterfaceNumber,
1409 interface->desc.bAlternateSetting);
1410 else
1411 status = 0;
1412
1413 }
1414 if (status >= 0 && dev->status)
1415 status = init_status (dev, udev);
1416 if (status < 0)
1417 goto out3;
1418
1419 if (!dev->rx_urb_size)
1420 dev->rx_urb_size = dev->hard_mtu;
1421 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1422
1423 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1424 SET_NETDEV_DEVTYPE(net, &wlan_type);
1425 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1426 SET_NETDEV_DEVTYPE(net, &wwan_type);
1427
1428 status = register_netdev (net);
1429 if (status)
1430 goto out3;
1431 netif_info(dev, probe, dev->net,
1432 "register '%s' at usb-%s-%s, %s, %pM\n",
1433 udev->dev.driver->name,
1434 xdev->bus->bus_name, xdev->devpath,
1435 dev->driver_info->description,
1436 net->dev_addr);
1437
1438 // ok, it's ready to go.
1439 usb_set_intfdata (udev, dev);
1440
1441 netif_device_attach (net);
1442
1443 if (dev->driver_info->flags & FLAG_LINK_INTR)
1444 netif_carrier_off(net);
1445
1446 return 0;
1447
1448 out3:
1449 if (info->unbind)
1450 info->unbind (dev, udev);
1451 out1:
1452 free_netdev(net);
1453 out:
1454 usb_put_dev(xdev);
1455 return status;
1456 }
1457 EXPORT_SYMBOL_GPL(usbnet_probe);
1458
1459 /*-------------------------------------------------------------------------*/
1460
1461 /*
1462 * suspend the whole driver as soon as the first interface is suspended
1463 * resume only when the last interface is resumed
1464 */
1465
1466 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1467 {
1468 struct usbnet *dev = usb_get_intfdata(intf);
1469
1470 if (!dev->suspend_count++) {
1471 spin_lock_irq(&dev->txq.lock);
1472 /* don't autosuspend while transmitting */
1473 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1474 spin_unlock_irq(&dev->txq.lock);
1475 return -EBUSY;
1476 } else {
1477 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1478 spin_unlock_irq(&dev->txq.lock);
1479 }
1480 /*
1481 * accelerate emptying of the rx and queues, to avoid
1482 * having everything error out.
1483 */
1484 netif_device_detach (dev->net);
1485 usbnet_terminate_urbs(dev);
1486 usb_kill_urb(dev->interrupt);
1487
1488 /*
1489 * reattach so runtime management can use and
1490 * wake the device
1491 */
1492 netif_device_attach (dev->net);
1493 }
1494 return 0;
1495 }
1496 EXPORT_SYMBOL_GPL(usbnet_suspend);
1497
1498 int usbnet_resume (struct usb_interface *intf)
1499 {
1500 struct usbnet *dev = usb_get_intfdata(intf);
1501 struct sk_buff *skb;
1502 struct urb *res;
1503 int retval;
1504
1505 if (!--dev->suspend_count) {
1506 /* resume interrupt URBs */
1507 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1508 usb_submit_urb(dev->interrupt, GFP_NOIO);
1509
1510 spin_lock_irq(&dev->txq.lock);
1511 while ((res = usb_get_from_anchor(&dev->deferred))) {
1512
1513 skb = (struct sk_buff *)res->context;
1514 retval = usb_submit_urb(res, GFP_ATOMIC);
1515 if (retval < 0) {
1516 dev_kfree_skb_any(skb);
1517 usb_free_urb(res);
1518 usb_autopm_put_interface_async(dev->intf);
1519 } else {
1520 dev->net->trans_start = jiffies;
1521 __skb_queue_tail(&dev->txq, skb);
1522 }
1523 }
1524
1525 smp_mb();
1526 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1527 spin_unlock_irq(&dev->txq.lock);
1528
1529 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1530 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1531 netif_start_queue(dev->net);
1532 tasklet_schedule (&dev->bh);
1533 }
1534 }
1535 return 0;
1536 }
1537 EXPORT_SYMBOL_GPL(usbnet_resume);
1538
1539
1540 /*-------------------------------------------------------------------------*/
1541
1542 static int __init usbnet_init(void)
1543 {
1544 /* Compiler should optimize this out. */
1545 BUILD_BUG_ON(
1546 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1547
1548 random_ether_addr(node_id);
1549 return 0;
1550 }
1551 module_init(usbnet_init);
1552
1553 static void __exit usbnet_exit(void)
1554 {
1555 }
1556 module_exit(usbnet_exit);
1557
1558 MODULE_AUTHOR("David Brownell");
1559 MODULE_DESCRIPTION("USB network driver framework");
1560 MODULE_LICENSE("GPL");
Linux Btrfs Development