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panasonic-laptop: Simplify calls to acpi_pcc_retrieve_biosdata
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / usb / usbnet.c
blobca7fc9df1ccf900533d56c35326b360316283af2
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
49 #define DRIVER_VERSION "22-Aug-2005"
50
51
52 /*-------------------------------------------------------------------------*/
53
54 /*
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
60 *
61 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
62 * let the USB host controller be busy for 5msec or more before an irq
63 * is required, under load. Jumbograms change the equation.
64 */
65 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
66 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
67 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
68 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
69 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
70
71 // reawaken network queue this soon after stopping; else watchdog barks
72 #define TX_TIMEOUT_JIFFIES (5*HZ)
73
74 // throttle rx/tx briefly after some faults, so khubd might disconnect()
75 // us (it polls at HZ/4 usually) before we report too many false errors.
76 #define THROTTLE_JIFFIES (HZ/8)
77
78 // between wakeups
79 #define UNLINK_TIMEOUT_MS 3
80
81 /*-------------------------------------------------------------------------*/
82
83 // randomly generated ethernet address
84 static u8 node_id [ETH_ALEN];
85
86 static const char driver_name [] = "usbnet";
87
88 /* use ethtool to change the level for any given device */
89 static int msg_level = -1;
90 module_param (msg_level, int, 0);
91 MODULE_PARM_DESC (msg_level, "Override default message level");
92
93 /*-------------------------------------------------------------------------*/
94
95 /* handles CDC Ethernet and many other network "bulk data" interfaces */
96 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
97 {
98 int tmp;
99 struct usb_host_interface *alt = NULL;
100 struct usb_host_endpoint *in = NULL, *out = NULL;
101 struct usb_host_endpoint *status = NULL;
102
103 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
104 unsigned ep;
105
106 in = out = status = NULL;
107 alt = intf->altsetting + tmp;
108
109 /* take the first altsetting with in-bulk + out-bulk;
110 * remember any status endpoint, just in case;
111 * ignore other endpoints and altsetttings.
112 */
113 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
114 struct usb_host_endpoint *e;
115 int intr = 0;
116
117 e = alt->endpoint + ep;
118 switch (e->desc.bmAttributes) {
119 case USB_ENDPOINT_XFER_INT:
120 if (!usb_endpoint_dir_in(&e->desc))
121 continue;
122 intr = 1;
123 /* FALLTHROUGH */
124 case USB_ENDPOINT_XFER_BULK:
125 break;
126 default:
127 continue;
128 }
129 if (usb_endpoint_dir_in(&e->desc)) {
130 if (!intr && !in)
131 in = e;
132 else if (intr && !status)
133 status = e;
134 } else {
135 if (!out)
136 out = e;
137 }
138 }
139 if (in && out)
140 break;
141 }
142 if (!alt || !in || !out)
143 return -EINVAL;
144
145 if (alt->desc.bAlternateSetting != 0 ||
146 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
147 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
148 alt->desc.bAlternateSetting);
149 if (tmp < 0)
150 return tmp;
151 }
152
153 dev->in = usb_rcvbulkpipe (dev->udev,
154 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->out = usb_sndbulkpipe (dev->udev,
156 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
157 dev->status = status;
158 return 0;
159 }
160 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
161
162 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
163 {
164 int tmp, i;
165 unsigned char buf [13];
166
167 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
168 if (tmp != 12) {
169 dev_dbg(&dev->udev->dev,
170 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
171 if (tmp >= 0)
172 tmp = -EINVAL;
173 return tmp;
174 }
175 for (i = tmp = 0; i < 6; i++, tmp += 2)
176 dev->net->dev_addr [i] =
177 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
178 return 0;
179 }
180 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
181
182 static void intr_complete (struct urb *urb);
183
184 static int init_status (struct usbnet *dev, struct usb_interface *intf)
185 {
186 char *buf = NULL;
187 unsigned pipe = 0;
188 unsigned maxp;
189 unsigned period;
190
191 if (!dev->driver_info->status)
192 return 0;
193
194 pipe = usb_rcvintpipe (dev->udev,
195 dev->status->desc.bEndpointAddress
196 & USB_ENDPOINT_NUMBER_MASK);
197 maxp = usb_maxpacket (dev->udev, pipe, 0);
198
199 /* avoid 1 msec chatter: min 8 msec poll rate */
200 period = max ((int) dev->status->desc.bInterval,
201 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
202
203 buf = kmalloc (maxp, GFP_KERNEL);
204 if (buf) {
205 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
206 if (!dev->interrupt) {
207 kfree (buf);
208 return -ENOMEM;
209 } else {
210 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
211 buf, maxp, intr_complete, dev, period);
212 dev_dbg(&intf->dev,
213 "status ep%din, %d bytes period %d\n",
214 usb_pipeendpoint(pipe), maxp, period);
215 }
216 }
217 return 0;
218 }
219
220 /* Passes this packet up the stack, updating its accounting.
221 * Some link protocols batch packets, so their rx_fixup paths
222 * can return clones as well as just modify the original skb.
223 */
224 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
225 {
226 int status;
227
228 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
229 skb_queue_tail(&dev->rxq_pause, skb);
230 return;
231 }
232
233 skb->protocol = eth_type_trans (skb, dev->net);
234 dev->net->stats.rx_packets++;
235 dev->net->stats.rx_bytes += skb->len;
236
237 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
238 skb->len + sizeof (struct ethhdr), skb->protocol);
239 memset (skb->cb, 0, sizeof (struct skb_data));
240 status = netif_rx (skb);
241 if (status != NET_RX_SUCCESS)
242 netif_dbg(dev, rx_err, dev->net,
243 "netif_rx status %d\n", status);
244 }
245 EXPORT_SYMBOL_GPL(usbnet_skb_return);
246
247 \f
248 /*-------------------------------------------------------------------------
249 *
250 * Network Device Driver (peer link to "Host Device", from USB host)
251 *
252 *-------------------------------------------------------------------------*/
253
254 int usbnet_change_mtu (struct net_device *net, int new_mtu)
255 {
256 struct usbnet *dev = netdev_priv(net);
257 int ll_mtu = new_mtu + net->hard_header_len;
258 int old_hard_mtu = dev->hard_mtu;
259 int old_rx_urb_size = dev->rx_urb_size;
260
261 if (new_mtu <= 0)
262 return -EINVAL;
263 // no second zero-length packet read wanted after mtu-sized packets
264 if ((ll_mtu % dev->maxpacket) == 0)
265 return -EDOM;
266 net->mtu = new_mtu;
267
268 dev->hard_mtu = net->mtu + net->hard_header_len;
269 if (dev->rx_urb_size == old_hard_mtu) {
270 dev->rx_urb_size = dev->hard_mtu;
271 if (dev->rx_urb_size > old_rx_urb_size)
272 usbnet_unlink_rx_urbs(dev);
273 }
274
275 return 0;
276 }
277 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
278
279 /*-------------------------------------------------------------------------*/
280
281 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
282 * completion callbacks. 2.5 should have fixed those bugs...
283 */
284
285 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
286 {
287 unsigned long flags;
288
289 spin_lock_irqsave(&list->lock, flags);
290 __skb_unlink(skb, list);
291 spin_unlock(&list->lock);
292 spin_lock(&dev->done.lock);
293 __skb_queue_tail(&dev->done, skb);
294 if (dev->done.qlen == 1)
295 tasklet_schedule(&dev->bh);
296 spin_unlock_irqrestore(&dev->done.lock, flags);
297 }
298
299 /* some work can't be done in tasklets, so we use keventd
300 *
301 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
302 * but tasklet_schedule() doesn't. hope the failure is rare.
303 */
304 void usbnet_defer_kevent (struct usbnet *dev, int work)
305 {
306 set_bit (work, &dev->flags);
307 if (!schedule_work (&dev->kevent))
308 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
309 else
310 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
311 }
312 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
313
314 /*-------------------------------------------------------------------------*/
315
316 static void rx_complete (struct urb *urb);
317
318 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
319 {
320 struct sk_buff *skb;
321 struct skb_data *entry;
322 int retval = 0;
323 unsigned long lockflags;
324 size_t size = dev->rx_urb_size;
325
326 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
327 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
328 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
329 usb_free_urb (urb);
330 return -ENOMEM;
331 }
332 skb_reserve (skb, NET_IP_ALIGN);
333
334 entry = (struct skb_data *) skb->cb;
335 entry->urb = urb;
336 entry->dev = dev;
337 entry->state = rx_start;
338 entry->length = 0;
339
340 usb_fill_bulk_urb (urb, dev->udev, dev->in,
341 skb->data, size, rx_complete, skb);
342
343 spin_lock_irqsave (&dev->rxq.lock, lockflags);
344
345 if (netif_running (dev->net) &&
346 netif_device_present (dev->net) &&
347 !test_bit (EVENT_RX_HALT, &dev->flags) &&
348 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
349 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
350 case -EPIPE:
351 usbnet_defer_kevent (dev, EVENT_RX_HALT);
352 break;
353 case -ENOMEM:
354 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
355 break;
356 case -ENODEV:
357 netif_dbg(dev, ifdown, dev->net, "device gone\n");
358 netif_device_detach (dev->net);
359 break;
360 case -EHOSTUNREACH:
361 retval = -ENOLINK;
362 break;
363 default:
364 netif_dbg(dev, rx_err, dev->net,
365 "rx submit, %d\n", retval);
366 tasklet_schedule (&dev->bh);
367 break;
368 case 0:
369 __skb_queue_tail (&dev->rxq, skb);
370 }
371 } else {
372 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
373 retval = -ENOLINK;
374 }
375 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
376 if (retval) {
377 dev_kfree_skb_any (skb);
378 usb_free_urb (urb);
379 }
380 return retval;
381 }
382
383
384 /*-------------------------------------------------------------------------*/
385
386 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
387 {
388 if (dev->driver_info->rx_fixup &&
389 !dev->driver_info->rx_fixup (dev, skb))
390 goto error;
391 // else network stack removes extra byte if we forced a short packet
392
393 if (skb->len)
394 usbnet_skb_return (dev, skb);
395 else {
396 netif_dbg(dev, rx_err, dev->net, "drop\n");
397 error:
398 dev->net->stats.rx_errors++;
399 skb_queue_tail (&dev->done, skb);
400 }
401 }
402
403 /*-------------------------------------------------------------------------*/
404
405 static void rx_complete (struct urb *urb)
406 {
407 struct sk_buff *skb = (struct sk_buff *) urb->context;
408 struct skb_data *entry = (struct skb_data *) skb->cb;
409 struct usbnet *dev = entry->dev;
410 int urb_status = urb->status;
411
412 skb_put (skb, urb->actual_length);
413 entry->state = rx_done;
414 entry->urb = NULL;
415
416 switch (urb_status) {
417 /* success */
418 case 0:
419 if (skb->len < dev->net->hard_header_len) {
420 entry->state = rx_cleanup;
421 dev->net->stats.rx_errors++;
422 dev->net->stats.rx_length_errors++;
423 netif_dbg(dev, rx_err, dev->net,
424 "rx length %d\n", skb->len);
425 }
426 break;
427
428 /* stalls need manual reset. this is rare ... except that
429 * when going through USB 2.0 TTs, unplug appears this way.
430 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
431 * storm, recovering as needed.
432 */
433 case -EPIPE:
434 dev->net->stats.rx_errors++;
435 usbnet_defer_kevent (dev, EVENT_RX_HALT);
436 // FALLTHROUGH
437
438 /* software-driven interface shutdown */
439 case -ECONNRESET: /* async unlink */
440 case -ESHUTDOWN: /* hardware gone */
441 netif_dbg(dev, ifdown, dev->net,
442 "rx shutdown, code %d\n", urb_status);
443 goto block;
444
445 /* we get controller i/o faults during khubd disconnect() delays.
446 * throttle down resubmits, to avoid log floods; just temporarily,
447 * so we still recover when the fault isn't a khubd delay.
448 */
449 case -EPROTO:
450 case -ETIME:
451 case -EILSEQ:
452 dev->net->stats.rx_errors++;
453 if (!timer_pending (&dev->delay)) {
454 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
455 netif_dbg(dev, link, dev->net,
456 "rx throttle %d\n", urb_status);
457 }
458 block:
459 entry->state = rx_cleanup;
460 entry->urb = urb;
461 urb = NULL;
462 break;
463
464 /* data overrun ... flush fifo? */
465 case -EOVERFLOW:
466 dev->net->stats.rx_over_errors++;
467 // FALLTHROUGH
468
469 default:
470 entry->state = rx_cleanup;
471 dev->net->stats.rx_errors++;
472 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
473 break;
474 }
475
476 defer_bh(dev, skb, &dev->rxq);
477
478 if (urb) {
479 if (netif_running (dev->net) &&
480 !test_bit (EVENT_RX_HALT, &dev->flags)) {
481 rx_submit (dev, urb, GFP_ATOMIC);
482 return;
483 }
484 usb_free_urb (urb);
485 }
486 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
487 }
488
489 static void intr_complete (struct urb *urb)
490 {
491 struct usbnet *dev = urb->context;
492 int status = urb->status;
493
494 switch (status) {
495 /* success */
496 case 0:
497 dev->driver_info->status(dev, urb);
498 break;
499
500 /* software-driven interface shutdown */
501 case -ENOENT: /* urb killed */
502 case -ESHUTDOWN: /* hardware gone */
503 netif_dbg(dev, ifdown, dev->net,
504 "intr shutdown, code %d\n", status);
505 return;
506
507 /* NOTE: not throttling like RX/TX, since this endpoint
508 * already polls infrequently
509 */
510 default:
511 netdev_dbg(dev->net, "intr status %d\n", status);
512 break;
513 }
514
515 if (!netif_running (dev->net))
516 return;
517
518 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
519 status = usb_submit_urb (urb, GFP_ATOMIC);
520 if (status != 0)
521 netif_err(dev, timer, dev->net,
522 "intr resubmit --> %d\n", status);
523 }
524
525 /*-------------------------------------------------------------------------*/
526 void usbnet_pause_rx(struct usbnet *dev)
527 {
528 set_bit(EVENT_RX_PAUSED, &dev->flags);
529
530 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
531 }
532 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
533
534 void usbnet_resume_rx(struct usbnet *dev)
535 {
536 struct sk_buff *skb;
537 int num = 0;
538
539 clear_bit(EVENT_RX_PAUSED, &dev->flags);
540
541 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
542 usbnet_skb_return(dev, skb);
543 num++;
544 }
545
546 tasklet_schedule(&dev->bh);
547
548 netif_dbg(dev, rx_status, dev->net,
549 "paused rx queue disabled, %d skbs requeued\n", num);
550 }
551 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
552
553 void usbnet_purge_paused_rxq(struct usbnet *dev)
554 {
555 skb_queue_purge(&dev->rxq_pause);
556 }
557 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
558
559 /*-------------------------------------------------------------------------*/
560
561 // unlink pending rx/tx; completion handlers do all other cleanup
562
563 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
564 {
565 unsigned long flags;
566 struct sk_buff *skb, *skbnext;
567 int count = 0;
568
569 spin_lock_irqsave (&q->lock, flags);
570 skb_queue_walk_safe(q, skb, skbnext) {
571 struct skb_data *entry;
572 struct urb *urb;
573 int retval;
574
575 entry = (struct skb_data *) skb->cb;
576 urb = entry->urb;
577
578 // during some PM-driven resume scenarios,
579 // these (async) unlinks complete immediately
580 retval = usb_unlink_urb (urb);
581 if (retval != -EINPROGRESS && retval != 0)
582 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
583 else
584 count++;
585 }
586 spin_unlock_irqrestore (&q->lock, flags);
587 return count;
588 }
589
590 // Flush all pending rx urbs
591 // minidrivers may need to do this when the MTU changes
592
593 void usbnet_unlink_rx_urbs(struct usbnet *dev)
594 {
595 if (netif_running(dev->net)) {
596 (void) unlink_urbs (dev, &dev->rxq);
597 tasklet_schedule(&dev->bh);
598 }
599 }
600 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
601
602 /*-------------------------------------------------------------------------*/
603
604 // precondition: never called in_interrupt
605 static void usbnet_terminate_urbs(struct usbnet *dev)
606 {
607 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
608 DECLARE_WAITQUEUE(wait, current);
609 int temp;
610
611 /* ensure there are no more active urbs */
612 add_wait_queue(&unlink_wakeup, &wait);
613 set_current_state(TASK_UNINTERRUPTIBLE);
614 dev->wait = &unlink_wakeup;
615 temp = unlink_urbs(dev, &dev->txq) +
616 unlink_urbs(dev, &dev->rxq);
617
618 /* maybe wait for deletions to finish. */
619 while (!skb_queue_empty(&dev->rxq)
620 && !skb_queue_empty(&dev->txq)
621 && !skb_queue_empty(&dev->done)) {
622 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
623 set_current_state(TASK_UNINTERRUPTIBLE);
624 netif_dbg(dev, ifdown, dev->net,
625 "waited for %d urb completions\n", temp);
626 }
627 set_current_state(TASK_RUNNING);
628 dev->wait = NULL;
629 remove_wait_queue(&unlink_wakeup, &wait);
630 }
631
632 int usbnet_stop (struct net_device *net)
633 {
634 struct usbnet *dev = netdev_priv(net);
635 struct driver_info *info = dev->driver_info;
636 int retval;
637
638 netif_stop_queue (net);
639
640 netif_info(dev, ifdown, dev->net,
641 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
642 net->stats.rx_packets, net->stats.tx_packets,
643 net->stats.rx_errors, net->stats.tx_errors);
644
645 /* allow minidriver to stop correctly (wireless devices to turn off
646 * radio etc) */
647 if (info->stop) {
648 retval = info->stop(dev);
649 if (retval < 0)
650 netif_info(dev, ifdown, dev->net,
651 "stop fail (%d) usbnet usb-%s-%s, %s\n",
652 retval,
653 dev->udev->bus->bus_name, dev->udev->devpath,
654 info->description);
655 }
656
657 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
658 usbnet_terminate_urbs(dev);
659
660 usb_kill_urb(dev->interrupt);
661
662 usbnet_purge_paused_rxq(dev);
663
664 /* deferred work (task, timer, softirq) must also stop.
665 * can't flush_scheduled_work() until we drop rtnl (later),
666 * else workers could deadlock; so make workers a NOP.
667 */
668 dev->flags = 0;
669 del_timer_sync (&dev->delay);
670 tasklet_kill (&dev->bh);
671 if (info->manage_power)
672 info->manage_power(dev, 0);
673 else
674 usb_autopm_put_interface(dev->intf);
675
676 return 0;
677 }
678 EXPORT_SYMBOL_GPL(usbnet_stop);
679
680 /*-------------------------------------------------------------------------*/
681
682 // posts reads, and enables write queuing
683
684 // precondition: never called in_interrupt
685
686 int usbnet_open (struct net_device *net)
687 {
688 struct usbnet *dev = netdev_priv(net);
689 int retval;
690 struct driver_info *info = dev->driver_info;
691
692 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
693 netif_info(dev, ifup, dev->net,
694 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
695 retval,
696 dev->udev->bus->bus_name,
697 dev->udev->devpath,
698 info->description);
699 goto done_nopm;
700 }
701
702 // put into "known safe" state
703 if (info->reset && (retval = info->reset (dev)) < 0) {
704 netif_info(dev, ifup, dev->net,
705 "open reset 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;
711 }
712
713 // insist peer be connected
714 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
715 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
716 goto done;
717 }
718
719 /* start any status interrupt transfer */
720 if (dev->interrupt) {
721 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
722 if (retval < 0) {
723 netif_err(dev, ifup, dev->net,
724 "intr submit %d\n", retval);
725 goto done;
726 }
727 }
728
729 netif_start_queue (net);
730 netif_info(dev, ifup, dev->net,
731 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
732 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
733 dev->net->mtu,
734 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
735 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
736 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
737 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
738 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
739 "simple");
740
741 // delay posting reads until we're fully open
742 tasklet_schedule (&dev->bh);
743 if (info->manage_power) {
744 retval = info->manage_power(dev, 1);
745 if (retval < 0)
746 goto done;
747 usb_autopm_put_interface(dev->intf);
748 }
749 return retval;
750
751 done:
752 usb_autopm_put_interface(dev->intf);
753 done_nopm:
754 return retval;
755 }
756 EXPORT_SYMBOL_GPL(usbnet_open);
757
758 /*-------------------------------------------------------------------------*/
759
760 /* ethtool methods; minidrivers may need to add some more, but
761 * they'll probably want to use this base set.
762 */
763
764 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
765 {
766 struct usbnet *dev = netdev_priv(net);
767
768 if (!dev->mii.mdio_read)
769 return -EOPNOTSUPP;
770
771 return mii_ethtool_gset(&dev->mii, cmd);
772 }
773 EXPORT_SYMBOL_GPL(usbnet_get_settings);
774
775 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
776 {
777 struct usbnet *dev = netdev_priv(net);
778 int retval;
779
780 if (!dev->mii.mdio_write)
781 return -EOPNOTSUPP;
782
783 retval = mii_ethtool_sset(&dev->mii, cmd);
784
785 /* link speed/duplex might have changed */
786 if (dev->driver_info->link_reset)
787 dev->driver_info->link_reset(dev);
788
789 return retval;
790
791 }
792 EXPORT_SYMBOL_GPL(usbnet_set_settings);
793
794 u32 usbnet_get_link (struct net_device *net)
795 {
796 struct usbnet *dev = netdev_priv(net);
797
798 /* If a check_connect is defined, return its result */
799 if (dev->driver_info->check_connect)
800 return dev->driver_info->check_connect (dev) == 0;
801
802 /* if the device has mii operations, use those */
803 if (dev->mii.mdio_read)
804 return mii_link_ok(&dev->mii);
805
806 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
807 return ethtool_op_get_link(net);
808 }
809 EXPORT_SYMBOL_GPL(usbnet_get_link);
810
811 int usbnet_nway_reset(struct net_device *net)
812 {
813 struct usbnet *dev = netdev_priv(net);
814
815 if (!dev->mii.mdio_write)
816 return -EOPNOTSUPP;
817
818 return mii_nway_restart(&dev->mii);
819 }
820 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
821
822 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
823 {
824 struct usbnet *dev = netdev_priv(net);
825
826 strncpy (info->driver, dev->driver_name, sizeof info->driver);
827 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
828 strncpy (info->fw_version, dev->driver_info->description,
829 sizeof info->fw_version);
830 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
831 }
832 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
833
834 u32 usbnet_get_msglevel (struct net_device *net)
835 {
836 struct usbnet *dev = netdev_priv(net);
837
838 return dev->msg_enable;
839 }
840 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
841
842 void usbnet_set_msglevel (struct net_device *net, u32 level)
843 {
844 struct usbnet *dev = netdev_priv(net);
845
846 dev->msg_enable = level;
847 }
848 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
849
850 /* drivers may override default ethtool_ops in their bind() routine */
851 static const struct ethtool_ops usbnet_ethtool_ops = {
852 .get_settings = usbnet_get_settings,
853 .set_settings = usbnet_set_settings,
854 .get_link = usbnet_get_link,
855 .nway_reset = usbnet_nway_reset,
856 .get_drvinfo = usbnet_get_drvinfo,
857 .get_msglevel = usbnet_get_msglevel,
858 .set_msglevel = usbnet_set_msglevel,
859 };
860
861 /*-------------------------------------------------------------------------*/
862
863 /* work that cannot be done in interrupt context uses keventd.
864 *
865 * NOTE: with 2.5 we could do more of this using completion callbacks,
866 * especially now that control transfers can be queued.
867 */
868 static void
869 kevent (struct work_struct *work)
870 {
871 struct usbnet *dev =
872 container_of(work, struct usbnet, kevent);
873 int status;
874
875 /* usb_clear_halt() needs a thread context */
876 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
877 unlink_urbs (dev, &dev->txq);
878 status = usb_autopm_get_interface(dev->intf);
879 if (status < 0)
880 goto fail_pipe;
881 status = usb_clear_halt (dev->udev, dev->out);
882 usb_autopm_put_interface(dev->intf);
883 if (status < 0 &&
884 status != -EPIPE &&
885 status != -ESHUTDOWN) {
886 if (netif_msg_tx_err (dev))
887 fail_pipe:
888 netdev_err(dev->net, "can't clear tx halt, status %d\n",
889 status);
890 } else {
891 clear_bit (EVENT_TX_HALT, &dev->flags);
892 if (status != -ESHUTDOWN)
893 netif_wake_queue (dev->net);
894 }
895 }
896 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
897 unlink_urbs (dev, &dev->rxq);
898 status = usb_autopm_get_interface(dev->intf);
899 if (status < 0)
900 goto fail_halt;
901 status = usb_clear_halt (dev->udev, dev->in);
902 usb_autopm_put_interface(dev->intf);
903 if (status < 0 &&
904 status != -EPIPE &&
905 status != -ESHUTDOWN) {
906 if (netif_msg_rx_err (dev))
907 fail_halt:
908 netdev_err(dev->net, "can't clear rx halt, status %d\n",
909 status);
910 } else {
911 clear_bit (EVENT_RX_HALT, &dev->flags);
912 tasklet_schedule (&dev->bh);
913 }
914 }
915
916 /* tasklet could resubmit itself forever if memory is tight */
917 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
918 struct urb *urb = NULL;
919 int resched = 1;
920
921 if (netif_running (dev->net))
922 urb = usb_alloc_urb (0, GFP_KERNEL);
923 else
924 clear_bit (EVENT_RX_MEMORY, &dev->flags);
925 if (urb != NULL) {
926 clear_bit (EVENT_RX_MEMORY, &dev->flags);
927 status = usb_autopm_get_interface(dev->intf);
928 if (status < 0)
929 goto fail_lowmem;
930 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
931 resched = 0;
932 usb_autopm_put_interface(dev->intf);
933 fail_lowmem:
934 if (resched)
935 tasklet_schedule (&dev->bh);
936 }
937 }
938
939 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
940 struct driver_info *info = dev->driver_info;
941 int retval = 0;
942
943 clear_bit (EVENT_LINK_RESET, &dev->flags);
944 status = usb_autopm_get_interface(dev->intf);
945 if (status < 0)
946 goto skip_reset;
947 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
948 usb_autopm_put_interface(dev->intf);
949 skip_reset:
950 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
951 retval,
952 dev->udev->bus->bus_name,
953 dev->udev->devpath,
954 info->description);
955 } else {
956 usb_autopm_put_interface(dev->intf);
957 }
958 }
959
960 if (dev->flags)
961 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
962 }
963
964 /*-------------------------------------------------------------------------*/
965
966 static void tx_complete (struct urb *urb)
967 {
968 struct sk_buff *skb = (struct sk_buff *) urb->context;
969 struct skb_data *entry = (struct skb_data *) skb->cb;
970 struct usbnet *dev = entry->dev;
971
972 if (urb->status == 0) {
973 dev->net->stats.tx_packets++;
974 dev->net->stats.tx_bytes += entry->length;
975 } else {
976 dev->net->stats.tx_errors++;
977
978 switch (urb->status) {
979 case -EPIPE:
980 usbnet_defer_kevent (dev, EVENT_TX_HALT);
981 break;
982
983 /* software-driven interface shutdown */
984 case -ECONNRESET: // async unlink
985 case -ESHUTDOWN: // hardware gone
986 break;
987
988 // like rx, tx gets controller i/o faults during khubd delays
989 // and so it uses the same throttling mechanism.
990 case -EPROTO:
991 case -ETIME:
992 case -EILSEQ:
993 usb_mark_last_busy(dev->udev);
994 if (!timer_pending (&dev->delay)) {
995 mod_timer (&dev->delay,
996 jiffies + THROTTLE_JIFFIES);
997 netif_dbg(dev, link, dev->net,
998 "tx throttle %d\n", urb->status);
999 }
1000 netif_stop_queue (dev->net);
1001 break;
1002 default:
1003 netif_dbg(dev, tx_err, dev->net,
1004 "tx err %d\n", entry->urb->status);
1005 break;
1006 }
1007 }
1008
1009 usb_autopm_put_interface_async(dev->intf);
1010 urb->dev = NULL;
1011 entry->state = tx_done;
1012 defer_bh(dev, skb, &dev->txq);
1013 }
1014
1015 /*-------------------------------------------------------------------------*/
1016
1017 void usbnet_tx_timeout (struct net_device *net)
1018 {
1019 struct usbnet *dev = netdev_priv(net);
1020
1021 unlink_urbs (dev, &dev->txq);
1022 tasklet_schedule (&dev->bh);
1023
1024 // FIXME: device recovery -- reset?
1025 }
1026 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1027
1028 /*-------------------------------------------------------------------------*/
1029
1030 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1031 struct net_device *net)
1032 {
1033 struct usbnet *dev = netdev_priv(net);
1034 int length;
1035 struct urb *urb = NULL;
1036 struct skb_data *entry;
1037 struct driver_info *info = dev->driver_info;
1038 unsigned long flags;
1039 int retval;
1040
1041 // some devices want funky USB-level framing, for
1042 // win32 driver (usually) and/or hardware quirks
1043 if (info->tx_fixup) {
1044 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1045 if (!skb) {
1046 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1047 goto drop;
1048 }
1049 }
1050 length = skb->len;
1051
1052 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1053 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1054 goto drop;
1055 }
1056
1057 entry = (struct skb_data *) skb->cb;
1058 entry->urb = urb;
1059 entry->dev = dev;
1060 entry->state = tx_start;
1061 entry->length = length;
1062
1063 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1064 skb->data, skb->len, tx_complete, skb);
1065
1066 /* don't assume the hardware handles USB_ZERO_PACKET
1067 * NOTE: strictly conforming cdc-ether devices should expect
1068 * the ZLP here, but ignore the one-byte packet.
1069 */
1070 if (length % dev->maxpacket == 0) {
1071 if (!(info->flags & FLAG_SEND_ZLP)) {
1072 urb->transfer_buffer_length++;
1073 if (skb_tailroom(skb)) {
1074 skb->data[skb->len] = 0;
1075 __skb_put(skb, 1);
1076 }
1077 } else
1078 urb->transfer_flags |= URB_ZERO_PACKET;
1079 }
1080
1081 spin_lock_irqsave(&dev->txq.lock, flags);
1082 retval = usb_autopm_get_interface_async(dev->intf);
1083 if (retval < 0) {
1084 spin_unlock_irqrestore(&dev->txq.lock, flags);
1085 goto drop;
1086 }
1087
1088 #ifdef CONFIG_PM
1089 /* if this triggers the device is still a sleep */
1090 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1091 /* transmission will be done in resume */
1092 usb_anchor_urb(urb, &dev->deferred);
1093 /* no use to process more packets */
1094 netif_stop_queue(net);
1095 spin_unlock_irqrestore(&dev->txq.lock, flags);
1096 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1097 goto deferred;
1098 }
1099 #endif
1100
1101 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1102 case -EPIPE:
1103 netif_stop_queue (net);
1104 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1105 usb_autopm_put_interface_async(dev->intf);
1106 break;
1107 default:
1108 usb_autopm_put_interface_async(dev->intf);
1109 netif_dbg(dev, tx_err, dev->net,
1110 "tx: submit urb err %d\n", retval);
1111 break;
1112 case 0:
1113 net->trans_start = jiffies;
1114 __skb_queue_tail (&dev->txq, skb);
1115 if (dev->txq.qlen >= TX_QLEN (dev))
1116 netif_stop_queue (net);
1117 }
1118 spin_unlock_irqrestore (&dev->txq.lock, flags);
1119
1120 if (retval) {
1121 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1122 drop:
1123 dev->net->stats.tx_dropped++;
1124 if (skb)
1125 dev_kfree_skb_any (skb);
1126 usb_free_urb (urb);
1127 } else
1128 netif_dbg(dev, tx_queued, dev->net,
1129 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1130 #ifdef CONFIG_PM
1131 deferred:
1132 #endif
1133 return NETDEV_TX_OK;
1134 }
1135 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1136
1137 /*-------------------------------------------------------------------------*/
1138
1139 // tasklet (work deferred from completions, in_irq) or timer
1140
1141 static void usbnet_bh (unsigned long param)
1142 {
1143 struct usbnet *dev = (struct usbnet *) param;
1144 struct sk_buff *skb;
1145 struct skb_data *entry;
1146
1147 while ((skb = skb_dequeue (&dev->done))) {
1148 entry = (struct skb_data *) skb->cb;
1149 switch (entry->state) {
1150 case rx_done:
1151 entry->state = rx_cleanup;
1152 rx_process (dev, skb);
1153 continue;
1154 case tx_done:
1155 case rx_cleanup:
1156 usb_free_urb (entry->urb);
1157 dev_kfree_skb (skb);
1158 continue;
1159 default:
1160 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1161 }
1162 }
1163
1164 // waiting for all pending urbs to complete?
1165 if (dev->wait) {
1166 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1167 wake_up (dev->wait);
1168 }
1169
1170 // or are we maybe short a few urbs?
1171 } else if (netif_running (dev->net) &&
1172 netif_device_present (dev->net) &&
1173 !timer_pending (&dev->delay) &&
1174 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1175 int temp = dev->rxq.qlen;
1176 int qlen = RX_QLEN (dev);
1177
1178 if (temp < qlen) {
1179 struct urb *urb;
1180 int i;
1181
1182 // don't refill the queue all at once
1183 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1184 urb = usb_alloc_urb (0, GFP_ATOMIC);
1185 if (urb != NULL) {
1186 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1187 -ENOLINK)
1188 return;
1189 }
1190 }
1191 if (temp != dev->rxq.qlen)
1192 netif_dbg(dev, link, dev->net,
1193 "rxqlen %d --> %d\n",
1194 temp, dev->rxq.qlen);
1195 if (dev->rxq.qlen < qlen)
1196 tasklet_schedule (&dev->bh);
1197 }
1198 if (dev->txq.qlen < TX_QLEN (dev))
1199 netif_wake_queue (dev->net);
1200 }
1201 }
1202
1203
1204 /*-------------------------------------------------------------------------
1205 *
1206 * USB Device Driver support
1207 *
1208 *-------------------------------------------------------------------------*/
1209
1210 // precondition: never called in_interrupt
1211
1212 void usbnet_disconnect (struct usb_interface *intf)
1213 {
1214 struct usbnet *dev;
1215 struct usb_device *xdev;
1216 struct net_device *net;
1217
1218 dev = usb_get_intfdata(intf);
1219 usb_set_intfdata(intf, NULL);
1220 if (!dev)
1221 return;
1222
1223 xdev = interface_to_usbdev (intf);
1224
1225 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1226 intf->dev.driver->name,
1227 xdev->bus->bus_name, xdev->devpath,
1228 dev->driver_info->description);
1229
1230 net = dev->net;
1231 unregister_netdev (net);
1232
1233 /* we don't hold rtnl here ... */
1234 flush_scheduled_work ();
1235
1236 if (dev->driver_info->unbind)
1237 dev->driver_info->unbind (dev, intf);
1238
1239 free_netdev(net);
1240 usb_put_dev (xdev);
1241 }
1242 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1243
1244 static const struct net_device_ops usbnet_netdev_ops = {
1245 .ndo_open = usbnet_open,
1246 .ndo_stop = usbnet_stop,
1247 .ndo_start_xmit = usbnet_start_xmit,
1248 .ndo_tx_timeout = usbnet_tx_timeout,
1249 .ndo_change_mtu = usbnet_change_mtu,
1250 .ndo_set_mac_address = eth_mac_addr,
1251 .ndo_validate_addr = eth_validate_addr,
1252 };
1253
1254 /*-------------------------------------------------------------------------*/
1255
1256 // precondition: never called in_interrupt
1257
1258 static struct device_type wlan_type = {
1259 .name = "wlan",
1260 };
1261
1262 static struct device_type wwan_type = {
1263 .name = "wwan",
1264 };
1265
1266 int
1267 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1268 {
1269 struct usbnet *dev;
1270 struct net_device *net;
1271 struct usb_host_interface *interface;
1272 struct driver_info *info;
1273 struct usb_device *xdev;
1274 int status;
1275 const char *name;
1276
1277 name = udev->dev.driver->name;
1278 info = (struct driver_info *) prod->driver_info;
1279 if (!info) {
1280 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1281 return -ENODEV;
1282 }
1283 xdev = interface_to_usbdev (udev);
1284 interface = udev->cur_altsetting;
1285
1286 usb_get_dev (xdev);
1287
1288 status = -ENOMEM;
1289
1290 // set up our own records
1291 net = alloc_etherdev(sizeof(*dev));
1292 if (!net) {
1293 dbg ("can't kmalloc dev");
1294 goto out;
1295 }
1296
1297 /* netdev_printk() needs this so do it as early as possible */
1298 SET_NETDEV_DEV(net, &udev->dev);
1299
1300 dev = netdev_priv(net);
1301 dev->udev = xdev;
1302 dev->intf = udev;
1303 dev->driver_info = info;
1304 dev->driver_name = name;
1305 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1306 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1307 skb_queue_head_init (&dev->rxq);
1308 skb_queue_head_init (&dev->txq);
1309 skb_queue_head_init (&dev->done);
1310 skb_queue_head_init(&dev->rxq_pause);
1311 dev->bh.func = usbnet_bh;
1312 dev->bh.data = (unsigned long) dev;
1313 INIT_WORK (&dev->kevent, kevent);
1314 init_usb_anchor(&dev->deferred);
1315 dev->delay.function = usbnet_bh;
1316 dev->delay.data = (unsigned long) dev;
1317 init_timer (&dev->delay);
1318 mutex_init (&dev->phy_mutex);
1319
1320 dev->net = net;
1321 strcpy (net->name, "usb%d");
1322 memcpy (net->dev_addr, node_id, sizeof node_id);
1323
1324 /* rx and tx sides can use different message sizes;
1325 * bind() should set rx_urb_size in that case.
1326 */
1327 dev->hard_mtu = net->mtu + net->hard_header_len;
1328 #if 0
1329 // dma_supported() is deeply broken on almost all architectures
1330 // possible with some EHCI controllers
1331 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1332 net->features |= NETIF_F_HIGHDMA;
1333 #endif
1334
1335 net->netdev_ops = &usbnet_netdev_ops;
1336 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1337 net->ethtool_ops = &usbnet_ethtool_ops;
1338
1339 // allow device-specific bind/init procedures
1340 // NOTE net->name still not usable ...
1341 if (info->bind) {
1342 status = info->bind (dev, udev);
1343 if (status < 0)
1344 goto out1;
1345
1346 // heuristic: "usb%d" for links we know are two-host,
1347 // else "eth%d" when there's reasonable doubt. userspace
1348 // can rename the link if it knows better.
1349 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1350 (net->dev_addr [0] & 0x02) == 0)
1351 strcpy (net->name, "eth%d");
1352 /* WLAN devices should always be named "wlan%d" */
1353 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1354 strcpy(net->name, "wlan%d");
1355 /* WWAN devices should always be named "wwan%d" */
1356 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1357 strcpy(net->name, "wwan%d");
1358
1359 /* maybe the remote can't receive an Ethernet MTU */
1360 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1361 net->mtu = dev->hard_mtu - net->hard_header_len;
1362 } else if (!info->in || !info->out)
1363 status = usbnet_get_endpoints (dev, udev);
1364 else {
1365 dev->in = usb_rcvbulkpipe (xdev, info->in);
1366 dev->out = usb_sndbulkpipe (xdev, info->out);
1367 if (!(info->flags & FLAG_NO_SETINT))
1368 status = usb_set_interface (xdev,
1369 interface->desc.bInterfaceNumber,
1370 interface->desc.bAlternateSetting);
1371 else
1372 status = 0;
1373
1374 }
1375 if (status >= 0 && dev->status)
1376 status = init_status (dev, udev);
1377 if (status < 0)
1378 goto out3;
1379
1380 if (!dev->rx_urb_size)
1381 dev->rx_urb_size = dev->hard_mtu;
1382 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1383
1384 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1385 SET_NETDEV_DEVTYPE(net, &wlan_type);
1386 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1387 SET_NETDEV_DEVTYPE(net, &wwan_type);
1388
1389 status = register_netdev (net);
1390 if (status)
1391 goto out3;
1392 netif_info(dev, probe, dev->net,
1393 "register '%s' at usb-%s-%s, %s, %pM\n",
1394 udev->dev.driver->name,
1395 xdev->bus->bus_name, xdev->devpath,
1396 dev->driver_info->description,
1397 net->dev_addr);
1398
1399 // ok, it's ready to go.
1400 usb_set_intfdata (udev, dev);
1401
1402 netif_device_attach (net);
1403
1404 if (dev->driver_info->flags & FLAG_LINK_INTR)
1405 netif_carrier_off(net);
1406
1407 return 0;
1408
1409 out3:
1410 if (info->unbind)
1411 info->unbind (dev, udev);
1412 out1:
1413 free_netdev(net);
1414 out:
1415 usb_put_dev(xdev);
1416 return status;
1417 }
1418 EXPORT_SYMBOL_GPL(usbnet_probe);
1419
1420 /*-------------------------------------------------------------------------*/
1421
1422 /*
1423 * suspend the whole driver as soon as the first interface is suspended
1424 * resume only when the last interface is resumed
1425 */
1426
1427 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1428 {
1429 struct usbnet *dev = usb_get_intfdata(intf);
1430
1431 if (!dev->suspend_count++) {
1432 spin_lock_irq(&dev->txq.lock);
1433 /* don't autosuspend while transmitting */
1434 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1435 spin_unlock_irq(&dev->txq.lock);
1436 return -EBUSY;
1437 } else {
1438 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1439 spin_unlock_irq(&dev->txq.lock);
1440 }
1441 /*
1442 * accelerate emptying of the rx and queues, to avoid
1443 * having everything error out.
1444 */
1445 netif_device_detach (dev->net);
1446 usbnet_terminate_urbs(dev);
1447 usb_kill_urb(dev->interrupt);
1448
1449 /*
1450 * reattach so runtime management can use and
1451 * wake the device
1452 */
1453 netif_device_attach (dev->net);
1454 }
1455 return 0;
1456 }
1457 EXPORT_SYMBOL_GPL(usbnet_suspend);
1458
1459 int usbnet_resume (struct usb_interface *intf)
1460 {
1461 struct usbnet *dev = usb_get_intfdata(intf);
1462 struct sk_buff *skb;
1463 struct urb *res;
1464 int retval;
1465
1466 if (!--dev->suspend_count) {
1467 spin_lock_irq(&dev->txq.lock);
1468 while ((res = usb_get_from_anchor(&dev->deferred))) {
1469
1470 skb = (struct sk_buff *)res->context;
1471 retval = usb_submit_urb(res, GFP_ATOMIC);
1472 if (retval < 0) {
1473 dev_kfree_skb_any(skb);
1474 usb_free_urb(res);
1475 usb_autopm_put_interface_async(dev->intf);
1476 } else {
1477 dev->net->trans_start = jiffies;
1478 __skb_queue_tail(&dev->txq, skb);
1479 }
1480 }
1481
1482 smp_mb();
1483 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1484 spin_unlock_irq(&dev->txq.lock);
1485 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1486 netif_start_queue(dev->net);
1487 tasklet_schedule (&dev->bh);
1488 }
1489 return 0;
1490 }
1491 EXPORT_SYMBOL_GPL(usbnet_resume);
1492
1493
1494 /*-------------------------------------------------------------------------*/
1495
1496 static int __init usbnet_init(void)
1497 {
1498 /* compiler should optimize this out */
1499 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1500 < sizeof (struct skb_data));
1501
1502 random_ether_addr(node_id);
1503 return 0;
1504 }
1505 module_init(usbnet_init);
1506
1507 static void __exit usbnet_exit(void)
1508 {
1509 }
1510 module_exit(usbnet_exit);
1511
1512 MODULE_AUTHOR("David Brownell");
1513 MODULE_DESCRIPTION("USB network driver framework");
1514 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree