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treewide: fix a few typos in comments
[zen-stable.git] / drivers / net / usb / usbnet.c
blobfef9ecc7b7aab98ed4b211a3b6097f2f4518dbf4
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 netif_stop_queue (net);
649
650 netif_info(dev, ifdown, dev->net,
651 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
652 net->stats.rx_packets, net->stats.tx_packets,
653 net->stats.rx_errors, net->stats.tx_errors);
654
655 /* allow minidriver to stop correctly (wireless devices to turn off
656 * radio etc) */
657 if (info->stop) {
658 retval = info->stop(dev);
659 if (retval < 0)
660 netif_info(dev, ifdown, dev->net,
661 "stop fail (%d) usbnet usb-%s-%s, %s\n",
662 retval,
663 dev->udev->bus->bus_name, dev->udev->devpath,
664 info->description);
665 }
666
667 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
668 usbnet_terminate_urbs(dev);
669
670 usb_kill_urb(dev->interrupt);
671
672 usbnet_purge_paused_rxq(dev);
673
674 /* deferred work (task, timer, softirq) must also stop.
675 * can't flush_scheduled_work() until we drop rtnl (later),
676 * else workers could deadlock; so make workers a NOP.
677 */
678 dev->flags = 0;
679 del_timer_sync (&dev->delay);
680 tasklet_kill (&dev->bh);
681 if (info->manage_power)
682 info->manage_power(dev, 0);
683 else
684 usb_autopm_put_interface(dev->intf);
685
686 return 0;
687 }
688 EXPORT_SYMBOL_GPL(usbnet_stop);
689
690 /*-------------------------------------------------------------------------*/
691
692 // posts reads, and enables write queuing
693
694 // precondition: never called in_interrupt
695
696 int usbnet_open (struct net_device *net)
697 {
698 struct usbnet *dev = netdev_priv(net);
699 int retval;
700 struct driver_info *info = dev->driver_info;
701
702 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
703 netif_info(dev, ifup, dev->net,
704 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
705 retval,
706 dev->udev->bus->bus_name,
707 dev->udev->devpath,
708 info->description);
709 goto done_nopm;
710 }
711
712 // put into "known safe" state
713 if (info->reset && (retval = info->reset (dev)) < 0) {
714 netif_info(dev, ifup, dev->net,
715 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
716 retval,
717 dev->udev->bus->bus_name,
718 dev->udev->devpath,
719 info->description);
720 goto done;
721 }
722
723 // insist peer be connected
724 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
725 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
726 goto done;
727 }
728
729 /* start any status interrupt transfer */
730 if (dev->interrupt) {
731 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
732 if (retval < 0) {
733 netif_err(dev, ifup, dev->net,
734 "intr submit %d\n", retval);
735 goto done;
736 }
737 }
738
739 netif_start_queue (net);
740 netif_info(dev, ifup, dev->net,
741 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
742 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
743 dev->net->mtu,
744 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
745 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
746 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
747 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
748 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
749 "simple");
750
751 // delay posting reads until we're fully open
752 tasklet_schedule (&dev->bh);
753 if (info->manage_power) {
754 retval = info->manage_power(dev, 1);
755 if (retval < 0)
756 goto done;
757 usb_autopm_put_interface(dev->intf);
758 }
759 return retval;
760
761 done:
762 usb_autopm_put_interface(dev->intf);
763 done_nopm:
764 return retval;
765 }
766 EXPORT_SYMBOL_GPL(usbnet_open);
767
768 /*-------------------------------------------------------------------------*/
769
770 /* ethtool methods; minidrivers may need to add some more, but
771 * they'll probably want to use this base set.
772 */
773
774 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
775 {
776 struct usbnet *dev = netdev_priv(net);
777
778 if (!dev->mii.mdio_read)
779 return -EOPNOTSUPP;
780
781 return mii_ethtool_gset(&dev->mii, cmd);
782 }
783 EXPORT_SYMBOL_GPL(usbnet_get_settings);
784
785 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
786 {
787 struct usbnet *dev = netdev_priv(net);
788 int retval;
789
790 if (!dev->mii.mdio_write)
791 return -EOPNOTSUPP;
792
793 retval = mii_ethtool_sset(&dev->mii, cmd);
794
795 /* link speed/duplex might have changed */
796 if (dev->driver_info->link_reset)
797 dev->driver_info->link_reset(dev);
798
799 return retval;
800
801 }
802 EXPORT_SYMBOL_GPL(usbnet_set_settings);
803
804 u32 usbnet_get_link (struct net_device *net)
805 {
806 struct usbnet *dev = netdev_priv(net);
807
808 /* If a check_connect is defined, return its result */
809 if (dev->driver_info->check_connect)
810 return dev->driver_info->check_connect (dev) == 0;
811
812 /* if the device has mii operations, use those */
813 if (dev->mii.mdio_read)
814 return mii_link_ok(&dev->mii);
815
816 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
817 return ethtool_op_get_link(net);
818 }
819 EXPORT_SYMBOL_GPL(usbnet_get_link);
820
821 int usbnet_nway_reset(struct net_device *net)
822 {
823 struct usbnet *dev = netdev_priv(net);
824
825 if (!dev->mii.mdio_write)
826 return -EOPNOTSUPP;
827
828 return mii_nway_restart(&dev->mii);
829 }
830 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
831
832 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
833 {
834 struct usbnet *dev = netdev_priv(net);
835
836 strncpy (info->driver, dev->driver_name, sizeof info->driver);
837 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
838 strncpy (info->fw_version, dev->driver_info->description,
839 sizeof info->fw_version);
840 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
841 }
842 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
843
844 u32 usbnet_get_msglevel (struct net_device *net)
845 {
846 struct usbnet *dev = netdev_priv(net);
847
848 return dev->msg_enable;
849 }
850 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
851
852 void usbnet_set_msglevel (struct net_device *net, u32 level)
853 {
854 struct usbnet *dev = netdev_priv(net);
855
856 dev->msg_enable = level;
857 }
858 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
859
860 /* drivers may override default ethtool_ops in their bind() routine */
861 static const struct ethtool_ops usbnet_ethtool_ops = {
862 .get_settings = usbnet_get_settings,
863 .set_settings = usbnet_set_settings,
864 .get_link = usbnet_get_link,
865 .nway_reset = usbnet_nway_reset,
866 .get_drvinfo = usbnet_get_drvinfo,
867 .get_msglevel = usbnet_get_msglevel,
868 .set_msglevel = usbnet_set_msglevel,
869 };
870
871 /*-------------------------------------------------------------------------*/
872
873 /* work that cannot be done in interrupt context uses keventd.
874 *
875 * NOTE: with 2.5 we could do more of this using completion callbacks,
876 * especially now that control transfers can be queued.
877 */
878 static void
879 kevent (struct work_struct *work)
880 {
881 struct usbnet *dev =
882 container_of(work, struct usbnet, kevent);
883 int status;
884
885 /* usb_clear_halt() needs a thread context */
886 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
887 unlink_urbs (dev, &dev->txq);
888 status = usb_autopm_get_interface(dev->intf);
889 if (status < 0)
890 goto fail_pipe;
891 status = usb_clear_halt (dev->udev, dev->out);
892 usb_autopm_put_interface(dev->intf);
893 if (status < 0 &&
894 status != -EPIPE &&
895 status != -ESHUTDOWN) {
896 if (netif_msg_tx_err (dev))
897 fail_pipe:
898 netdev_err(dev->net, "can't clear tx halt, status %d\n",
899 status);
900 } else {
901 clear_bit (EVENT_TX_HALT, &dev->flags);
902 if (status != -ESHUTDOWN)
903 netif_wake_queue (dev->net);
904 }
905 }
906 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
907 unlink_urbs (dev, &dev->rxq);
908 status = usb_autopm_get_interface(dev->intf);
909 if (status < 0)
910 goto fail_halt;
911 status = usb_clear_halt (dev->udev, dev->in);
912 usb_autopm_put_interface(dev->intf);
913 if (status < 0 &&
914 status != -EPIPE &&
915 status != -ESHUTDOWN) {
916 if (netif_msg_rx_err (dev))
917 fail_halt:
918 netdev_err(dev->net, "can't clear rx halt, status %d\n",
919 status);
920 } else {
921 clear_bit (EVENT_RX_HALT, &dev->flags);
922 tasklet_schedule (&dev->bh);
923 }
924 }
925
926 /* tasklet could resubmit itself forever if memory is tight */
927 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
928 struct urb *urb = NULL;
929 int resched = 1;
930
931 if (netif_running (dev->net))
932 urb = usb_alloc_urb (0, GFP_KERNEL);
933 else
934 clear_bit (EVENT_RX_MEMORY, &dev->flags);
935 if (urb != NULL) {
936 clear_bit (EVENT_RX_MEMORY, &dev->flags);
937 status = usb_autopm_get_interface(dev->intf);
938 if (status < 0) {
939 usb_free_urb(urb);
940 goto fail_lowmem;
941 }
942 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
943 resched = 0;
944 usb_autopm_put_interface(dev->intf);
945 fail_lowmem:
946 if (resched)
947 tasklet_schedule (&dev->bh);
948 }
949 }
950
951 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
952 struct driver_info *info = dev->driver_info;
953 int retval = 0;
954
955 clear_bit (EVENT_LINK_RESET, &dev->flags);
956 status = usb_autopm_get_interface(dev->intf);
957 if (status < 0)
958 goto skip_reset;
959 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
960 usb_autopm_put_interface(dev->intf);
961 skip_reset:
962 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
963 retval,
964 dev->udev->bus->bus_name,
965 dev->udev->devpath,
966 info->description);
967 } else {
968 usb_autopm_put_interface(dev->intf);
969 }
970 }
971
972 if (dev->flags)
973 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
974 }
975
976 /*-------------------------------------------------------------------------*/
977
978 static void tx_complete (struct urb *urb)
979 {
980 struct sk_buff *skb = (struct sk_buff *) urb->context;
981 struct skb_data *entry = (struct skb_data *) skb->cb;
982 struct usbnet *dev = entry->dev;
983
984 if (urb->status == 0) {
985 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
986 dev->net->stats.tx_packets++;
987 dev->net->stats.tx_bytes += entry->length;
988 } else {
989 dev->net->stats.tx_errors++;
990
991 switch (urb->status) {
992 case -EPIPE:
993 usbnet_defer_kevent (dev, EVENT_TX_HALT);
994 break;
995
996 /* software-driven interface shutdown */
997 case -ECONNRESET: // async unlink
998 case -ESHUTDOWN: // hardware gone
999 break;
1000
1001 // like rx, tx gets controller i/o faults during khubd delays
1002 // and so it uses the same throttling mechanism.
1003 case -EPROTO:
1004 case -ETIME:
1005 case -EILSEQ:
1006 usb_mark_last_busy(dev->udev);
1007 if (!timer_pending (&dev->delay)) {
1008 mod_timer (&dev->delay,
1009 jiffies + THROTTLE_JIFFIES);
1010 netif_dbg(dev, link, dev->net,
1011 "tx throttle %d\n", urb->status);
1012 }
1013 netif_stop_queue (dev->net);
1014 break;
1015 default:
1016 netif_dbg(dev, tx_err, dev->net,
1017 "tx err %d\n", entry->urb->status);
1018 break;
1019 }
1020 }
1021
1022 usb_autopm_put_interface_async(dev->intf);
1023 urb->dev = NULL;
1024 entry->state = tx_done;
1025 defer_bh(dev, skb, &dev->txq);
1026 }
1027
1028 /*-------------------------------------------------------------------------*/
1029
1030 void usbnet_tx_timeout (struct net_device *net)
1031 {
1032 struct usbnet *dev = netdev_priv(net);
1033
1034 unlink_urbs (dev, &dev->txq);
1035 tasklet_schedule (&dev->bh);
1036
1037 // FIXME: device recovery -- reset?
1038 }
1039 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1040
1041 /*-------------------------------------------------------------------------*/
1042
1043 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1044 struct net_device *net)
1045 {
1046 struct usbnet *dev = netdev_priv(net);
1047 int length;
1048 struct urb *urb = NULL;
1049 struct skb_data *entry;
1050 struct driver_info *info = dev->driver_info;
1051 unsigned long flags;
1052 int retval;
1053
1054 // some devices want funky USB-level framing, for
1055 // win32 driver (usually) and/or hardware quirks
1056 if (info->tx_fixup) {
1057 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1058 if (!skb) {
1059 if (netif_msg_tx_err(dev)) {
1060 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1061 goto drop;
1062 } else {
1063 /* cdc_ncm collected packet; waits for more */
1064 goto not_drop;
1065 }
1066 }
1067 }
1068 length = skb->len;
1069
1070 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1071 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1072 goto drop;
1073 }
1074
1075 entry = (struct skb_data *) skb->cb;
1076 entry->urb = urb;
1077 entry->dev = dev;
1078 entry->state = tx_start;
1079 entry->length = length;
1080
1081 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1082 skb->data, skb->len, tx_complete, skb);
1083
1084 /* don't assume the hardware handles USB_ZERO_PACKET
1085 * NOTE: strictly conforming cdc-ether devices should expect
1086 * the ZLP here, but ignore the one-byte packet.
1087 * NOTE2: CDC NCM specification is different from CDC ECM when
1088 * handling ZLP/short packets, so cdc_ncm driver will make short
1089 * packet itself if needed.
1090 */
1091 if (length % dev->maxpacket == 0) {
1092 if (!(info->flags & FLAG_SEND_ZLP)) {
1093 if (!(info->flags & FLAG_MULTI_PACKET)) {
1094 urb->transfer_buffer_length++;
1095 if (skb_tailroom(skb)) {
1096 skb->data[skb->len] = 0;
1097 __skb_put(skb, 1);
1098 }
1099 }
1100 } else
1101 urb->transfer_flags |= URB_ZERO_PACKET;
1102 }
1103
1104 spin_lock_irqsave(&dev->txq.lock, flags);
1105 retval = usb_autopm_get_interface_async(dev->intf);
1106 if (retval < 0) {
1107 spin_unlock_irqrestore(&dev->txq.lock, flags);
1108 goto drop;
1109 }
1110
1111 #ifdef CONFIG_PM
1112 /* if this triggers the device is still a sleep */
1113 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1114 /* transmission will be done in resume */
1115 usb_anchor_urb(urb, &dev->deferred);
1116 /* no use to process more packets */
1117 netif_stop_queue(net);
1118 spin_unlock_irqrestore(&dev->txq.lock, flags);
1119 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1120 goto deferred;
1121 }
1122 #endif
1123
1124 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1125 case -EPIPE:
1126 netif_stop_queue (net);
1127 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1128 usb_autopm_put_interface_async(dev->intf);
1129 break;
1130 default:
1131 usb_autopm_put_interface_async(dev->intf);
1132 netif_dbg(dev, tx_err, dev->net,
1133 "tx: submit urb err %d\n", retval);
1134 break;
1135 case 0:
1136 net->trans_start = jiffies;
1137 __skb_queue_tail (&dev->txq, skb);
1138 if (dev->txq.qlen >= TX_QLEN (dev))
1139 netif_stop_queue (net);
1140 }
1141 spin_unlock_irqrestore (&dev->txq.lock, flags);
1142
1143 if (retval) {
1144 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1145 drop:
1146 dev->net->stats.tx_dropped++;
1147 not_drop:
1148 if (skb)
1149 dev_kfree_skb_any (skb);
1150 usb_free_urb (urb);
1151 } else
1152 netif_dbg(dev, tx_queued, dev->net,
1153 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1154 #ifdef CONFIG_PM
1155 deferred:
1156 #endif
1157 return NETDEV_TX_OK;
1158 }
1159 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1160
1161 /*-------------------------------------------------------------------------*/
1162
1163 // tasklet (work deferred from completions, in_irq) or timer
1164
1165 static void usbnet_bh (unsigned long param)
1166 {
1167 struct usbnet *dev = (struct usbnet *) param;
1168 struct sk_buff *skb;
1169 struct skb_data *entry;
1170
1171 while ((skb = skb_dequeue (&dev->done))) {
1172 entry = (struct skb_data *) skb->cb;
1173 switch (entry->state) {
1174 case rx_done:
1175 entry->state = rx_cleanup;
1176 rx_process (dev, skb);
1177 continue;
1178 case tx_done:
1179 case rx_cleanup:
1180 usb_free_urb (entry->urb);
1181 dev_kfree_skb (skb);
1182 continue;
1183 default:
1184 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1185 }
1186 }
1187
1188 // waiting for all pending urbs to complete?
1189 if (dev->wait) {
1190 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1191 wake_up (dev->wait);
1192 }
1193
1194 // or are we maybe short a few urbs?
1195 } else if (netif_running (dev->net) &&
1196 netif_device_present (dev->net) &&
1197 !timer_pending (&dev->delay) &&
1198 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1199 int temp = dev->rxq.qlen;
1200 int qlen = RX_QLEN (dev);
1201
1202 if (temp < qlen) {
1203 struct urb *urb;
1204 int i;
1205
1206 // don't refill the queue all at once
1207 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1208 urb = usb_alloc_urb (0, GFP_ATOMIC);
1209 if (urb != NULL) {
1210 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1211 -ENOLINK)
1212 return;
1213 }
1214 }
1215 if (temp != dev->rxq.qlen)
1216 netif_dbg(dev, link, dev->net,
1217 "rxqlen %d --> %d\n",
1218 temp, dev->rxq.qlen);
1219 if (dev->rxq.qlen < qlen)
1220 tasklet_schedule (&dev->bh);
1221 }
1222 if (dev->txq.qlen < TX_QLEN (dev))
1223 netif_wake_queue (dev->net);
1224 }
1225 }
1226
1227
1228 /*-------------------------------------------------------------------------
1229 *
1230 * USB Device Driver support
1231 *
1232 *-------------------------------------------------------------------------*/
1233
1234 // precondition: never called in_interrupt
1235
1236 void usbnet_disconnect (struct usb_interface *intf)
1237 {
1238 struct usbnet *dev;
1239 struct usb_device *xdev;
1240 struct net_device *net;
1241
1242 dev = usb_get_intfdata(intf);
1243 usb_set_intfdata(intf, NULL);
1244 if (!dev)
1245 return;
1246
1247 xdev = interface_to_usbdev (intf);
1248
1249 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1250 intf->dev.driver->name,
1251 xdev->bus->bus_name, xdev->devpath,
1252 dev->driver_info->description);
1253
1254 net = dev->net;
1255 unregister_netdev (net);
1256
1257 cancel_work_sync(&dev->kevent);
1258
1259 if (dev->driver_info->unbind)
1260 dev->driver_info->unbind (dev, intf);
1261
1262 free_netdev(net);
1263 usb_put_dev (xdev);
1264 }
1265 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1266
1267 static const struct net_device_ops usbnet_netdev_ops = {
1268 .ndo_open = usbnet_open,
1269 .ndo_stop = usbnet_stop,
1270 .ndo_start_xmit = usbnet_start_xmit,
1271 .ndo_tx_timeout = usbnet_tx_timeout,
1272 .ndo_change_mtu = usbnet_change_mtu,
1273 .ndo_set_mac_address = eth_mac_addr,
1274 .ndo_validate_addr = eth_validate_addr,
1275 };
1276
1277 /*-------------------------------------------------------------------------*/
1278
1279 // precondition: never called in_interrupt
1280
1281 static struct device_type wlan_type = {
1282 .name = "wlan",
1283 };
1284
1285 static struct device_type wwan_type = {
1286 .name = "wwan",
1287 };
1288
1289 int
1290 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1291 {
1292 struct usbnet *dev;
1293 struct net_device *net;
1294 struct usb_host_interface *interface;
1295 struct driver_info *info;
1296 struct usb_device *xdev;
1297 int status;
1298 const char *name;
1299 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1300
1301 /* usbnet already took usb runtime pm, so have to enable the feature
1302 * for usb interface, otherwise usb_autopm_get_interface may return
1303 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1304 */
1305 if (!driver->supports_autosuspend) {
1306 driver->supports_autosuspend = 1;
1307 pm_runtime_enable(&udev->dev);
1308 }
1309
1310 name = udev->dev.driver->name;
1311 info = (struct driver_info *) prod->driver_info;
1312 if (!info) {
1313 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1314 return -ENODEV;
1315 }
1316 xdev = interface_to_usbdev (udev);
1317 interface = udev->cur_altsetting;
1318
1319 usb_get_dev (xdev);
1320
1321 status = -ENOMEM;
1322
1323 // set up our own records
1324 net = alloc_etherdev(sizeof(*dev));
1325 if (!net) {
1326 dbg ("can't kmalloc dev");
1327 goto out;
1328 }
1329
1330 /* netdev_printk() needs this so do it as early as possible */
1331 SET_NETDEV_DEV(net, &udev->dev);
1332
1333 dev = netdev_priv(net);
1334 dev->udev = xdev;
1335 dev->intf = udev;
1336 dev->driver_info = info;
1337 dev->driver_name = name;
1338 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1339 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1340 skb_queue_head_init (&dev->rxq);
1341 skb_queue_head_init (&dev->txq);
1342 skb_queue_head_init (&dev->done);
1343 skb_queue_head_init(&dev->rxq_pause);
1344 dev->bh.func = usbnet_bh;
1345 dev->bh.data = (unsigned long) dev;
1346 INIT_WORK (&dev->kevent, kevent);
1347 init_usb_anchor(&dev->deferred);
1348 dev->delay.function = usbnet_bh;
1349 dev->delay.data = (unsigned long) dev;
1350 init_timer (&dev->delay);
1351 mutex_init (&dev->phy_mutex);
1352
1353 dev->net = net;
1354 strcpy (net->name, "usb%d");
1355 memcpy (net->dev_addr, node_id, sizeof node_id);
1356
1357 /* rx and tx sides can use different message sizes;
1358 * bind() should set rx_urb_size in that case.
1359 */
1360 dev->hard_mtu = net->mtu + net->hard_header_len;
1361 #if 0
1362 // dma_supported() is deeply broken on almost all architectures
1363 // possible with some EHCI controllers
1364 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1365 net->features |= NETIF_F_HIGHDMA;
1366 #endif
1367
1368 net->netdev_ops = &usbnet_netdev_ops;
1369 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1370 net->ethtool_ops = &usbnet_ethtool_ops;
1371
1372 // allow device-specific bind/init procedures
1373 // NOTE net->name still not usable ...
1374 if (info->bind) {
1375 status = info->bind (dev, udev);
1376 if (status < 0)
1377 goto out1;
1378
1379 // heuristic: "usb%d" for links we know are two-host,
1380 // else "eth%d" when there's reasonable doubt. userspace
1381 // can rename the link if it knows better.
1382 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1383 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1384 (net->dev_addr [0] & 0x02) == 0))
1385 strcpy (net->name, "eth%d");
1386 /* WLAN devices should always be named "wlan%d" */
1387 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1388 strcpy(net->name, "wlan%d");
1389 /* WWAN devices should always be named "wwan%d" */
1390 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1391 strcpy(net->name, "wwan%d");
1392
1393 /* maybe the remote can't receive an Ethernet MTU */
1394 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1395 net->mtu = dev->hard_mtu - net->hard_header_len;
1396 } else if (!info->in || !info->out)
1397 status = usbnet_get_endpoints (dev, udev);
1398 else {
1399 dev->in = usb_rcvbulkpipe (xdev, info->in);
1400 dev->out = usb_sndbulkpipe (xdev, info->out);
1401 if (!(info->flags & FLAG_NO_SETINT))
1402 status = usb_set_interface (xdev,
1403 interface->desc.bInterfaceNumber,
1404 interface->desc.bAlternateSetting);
1405 else
1406 status = 0;
1407
1408 }
1409 if (status >= 0 && dev->status)
1410 status = init_status (dev, udev);
1411 if (status < 0)
1412 goto out3;
1413
1414 if (!dev->rx_urb_size)
1415 dev->rx_urb_size = dev->hard_mtu;
1416 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1417
1418 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1419 SET_NETDEV_DEVTYPE(net, &wlan_type);
1420 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1421 SET_NETDEV_DEVTYPE(net, &wwan_type);
1422
1423 status = register_netdev (net);
1424 if (status)
1425 goto out3;
1426 netif_info(dev, probe, dev->net,
1427 "register '%s' at usb-%s-%s, %s, %pM\n",
1428 udev->dev.driver->name,
1429 xdev->bus->bus_name, xdev->devpath,
1430 dev->driver_info->description,
1431 net->dev_addr);
1432
1433 // ok, it's ready to go.
1434 usb_set_intfdata (udev, dev);
1435
1436 netif_device_attach (net);
1437
1438 if (dev->driver_info->flags & FLAG_LINK_INTR)
1439 netif_carrier_off(net);
1440
1441 return 0;
1442
1443 out3:
1444 if (info->unbind)
1445 info->unbind (dev, udev);
1446 out1:
1447 free_netdev(net);
1448 out:
1449 usb_put_dev(xdev);
1450 return status;
1451 }
1452 EXPORT_SYMBOL_GPL(usbnet_probe);
1453
1454 /*-------------------------------------------------------------------------*/
1455
1456 /*
1457 * suspend the whole driver as soon as the first interface is suspended
1458 * resume only when the last interface is resumed
1459 */
1460
1461 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1462 {
1463 struct usbnet *dev = usb_get_intfdata(intf);
1464
1465 if (!dev->suspend_count++) {
1466 spin_lock_irq(&dev->txq.lock);
1467 /* don't autosuspend while transmitting */
1468 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1469 spin_unlock_irq(&dev->txq.lock);
1470 return -EBUSY;
1471 } else {
1472 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1473 spin_unlock_irq(&dev->txq.lock);
1474 }
1475 /*
1476 * accelerate emptying of the rx and queues, to avoid
1477 * having everything error out.
1478 */
1479 netif_device_detach (dev->net);
1480 usbnet_terminate_urbs(dev);
1481 usb_kill_urb(dev->interrupt);
1482
1483 /*
1484 * reattach so runtime management can use and
1485 * wake the device
1486 */
1487 netif_device_attach (dev->net);
1488 }
1489 return 0;
1490 }
1491 EXPORT_SYMBOL_GPL(usbnet_suspend);
1492
1493 int usbnet_resume (struct usb_interface *intf)
1494 {
1495 struct usbnet *dev = usb_get_intfdata(intf);
1496 struct sk_buff *skb;
1497 struct urb *res;
1498 int retval;
1499
1500 if (!--dev->suspend_count) {
1501 spin_lock_irq(&dev->txq.lock);
1502 while ((res = usb_get_from_anchor(&dev->deferred))) {
1503
1504 skb = (struct sk_buff *)res->context;
1505 retval = usb_submit_urb(res, GFP_ATOMIC);
1506 if (retval < 0) {
1507 dev_kfree_skb_any(skb);
1508 usb_free_urb(res);
1509 usb_autopm_put_interface_async(dev->intf);
1510 } else {
1511 dev->net->trans_start = jiffies;
1512 __skb_queue_tail(&dev->txq, skb);
1513 }
1514 }
1515
1516 smp_mb();
1517 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1518 spin_unlock_irq(&dev->txq.lock);
1519 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1520 netif_start_queue(dev->net);
1521 tasklet_schedule (&dev->bh);
1522 }
1523 return 0;
1524 }
1525 EXPORT_SYMBOL_GPL(usbnet_resume);
1526
1527
1528 /*-------------------------------------------------------------------------*/
1529
1530 static int __init usbnet_init(void)
1531 {
1532 /* compiler should optimize this out */
1533 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1534 < sizeof (struct skb_data));
1535
1536 random_ether_addr(node_id);
1537 return 0;
1538 }
1539 module_init(usbnet_init);
1540
1541 static void __exit usbnet_exit(void)
1542 {
1543 }
1544 module_exit(usbnet_exit);
1545
1546 MODULE_AUTHOR("David Brownell");
1547 MODULE_DESCRIPTION("USB network driver framework");
1548 MODULE_LICENSE("GPL");