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xen: add kconfig menu
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / usb / usbnet.c
blob17b6a62d206e0d6825b8a7b0e83794fed4930e02
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46
47 #define DRIVER_VERSION "22-Aug-2005"
48
49
50 /*-------------------------------------------------------------------------*/
51
52 /*
53 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
54 * Several dozen bytes of IPv4 data can fit in two such transactions.
55 * One maximum size Ethernet packet takes twenty four of them.
56 * For high speed, each frame comfortably fits almost 36 max size
57 * Ethernet packets (so queues should be bigger).
58 *
59 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
60 * let the USB host controller be busy for 5msec or more before an irq
61 * is required, under load. Jumbograms change the equation.
62 */
63 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
64 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
65 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
66 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
67 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
72 // throttle rx/tx briefly after some faults, so khubd might disconnect()
73 // us (it polls at HZ/4 usually) before we report too many false errors.
74 #define THROTTLE_JIFFIES (HZ/8)
75
76 // between wakeups
77 #define UNLINK_TIMEOUT_MS 3
78
79 /*-------------------------------------------------------------------------*/
80
81 // randomly generated ethernet address
82 static u8 node_id [ETH_ALEN];
83
84 static const char driver_name [] = "usbnet";
85
86 /* use ethtool to change the level for any given device */
87 static int msg_level = -1;
88 module_param (msg_level, int, 0);
89 MODULE_PARM_DESC (msg_level, "Override default message level");
90
91 /*-------------------------------------------------------------------------*/
92
93 /* handles CDC Ethernet and many other network "bulk data" interfaces */
94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
95 {
96 int tmp;
97 struct usb_host_interface *alt = NULL;
98 struct usb_host_endpoint *in = NULL, *out = NULL;
99 struct usb_host_endpoint *status = NULL;
100
101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
102 unsigned ep;
103
104 in = out = status = NULL;
105 alt = intf->altsetting + tmp;
106
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
109 * ignore other endpoints and altsetttings.
110 */
111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
112 struct usb_host_endpoint *e;
113 int intr = 0;
114
115 e = alt->endpoint + ep;
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
118 if (!usb_endpoint_dir_in(&e->desc))
119 continue;
120 intr = 1;
121 /* FALLTHROUGH */
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
127 if (usb_endpoint_dir_in(&e->desc)) {
128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
143 if (alt->desc.bAlternateSetting != 0 ||
144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
146 alt->desc.bAlternateSetting);
147 if (tmp < 0)
148 return tmp;
149 }
150
151 dev->in = usb_rcvbulkpipe (dev->udev,
152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
153 dev->out = usb_sndbulkpipe (dev->udev,
154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->status = status;
156 return 0;
157 }
158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159
160 static u8 nibble(unsigned char c)
161 {
162 if (likely(isdigit(c)))
163 return c - '0';
164 c = toupper(c);
165 if (likely(isxdigit(c)))
166 return 10 + c - 'A';
167 return 0;
168 }
169
170 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
171 {
172 int tmp, i;
173 unsigned char buf [13];
174
175 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
176 if (tmp != 12) {
177 dev_dbg(&dev->udev->dev,
178 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
179 if (tmp >= 0)
180 tmp = -EINVAL;
181 return tmp;
182 }
183 for (i = tmp = 0; i < 6; i++, tmp += 2)
184 dev->net->dev_addr [i] =
185 (nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]);
186 return 0;
187 }
188 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
189
190 static void intr_complete (struct urb *urb);
191
192 static int init_status (struct usbnet *dev, struct usb_interface *intf)
193 {
194 char *buf = NULL;
195 unsigned pipe = 0;
196 unsigned maxp;
197 unsigned period;
198
199 if (!dev->driver_info->status)
200 return 0;
201
202 pipe = usb_rcvintpipe (dev->udev,
203 dev->status->desc.bEndpointAddress
204 & USB_ENDPOINT_NUMBER_MASK);
205 maxp = usb_maxpacket (dev->udev, pipe, 0);
206
207 /* avoid 1 msec chatter: min 8 msec poll rate */
208 period = max ((int) dev->status->desc.bInterval,
209 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
210
211 buf = kmalloc (maxp, GFP_KERNEL);
212 if (buf) {
213 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
214 if (!dev->interrupt) {
215 kfree (buf);
216 return -ENOMEM;
217 } else {
218 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
219 buf, maxp, intr_complete, dev, period);
220 dev_dbg(&intf->dev,
221 "status ep%din, %d bytes period %d\n",
222 usb_pipeendpoint(pipe), maxp, period);
223 }
224 }
225 return 0;
226 }
227
228 /* Passes this packet up the stack, updating its accounting.
229 * Some link protocols batch packets, so their rx_fixup paths
230 * can return clones as well as just modify the original skb.
231 */
232 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
233 {
234 int status;
235
236 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
237 skb_queue_tail(&dev->rxq_pause, skb);
238 return;
239 }
240
241 skb->protocol = eth_type_trans (skb, dev->net);
242 dev->net->stats.rx_packets++;
243 dev->net->stats.rx_bytes += skb->len;
244
245 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
246 skb->len + sizeof (struct ethhdr), skb->protocol);
247 memset (skb->cb, 0, sizeof (struct skb_data));
248 status = netif_rx (skb);
249 if (status != NET_RX_SUCCESS)
250 netif_dbg(dev, rx_err, dev->net,
251 "netif_rx status %d\n", status);
252 }
253 EXPORT_SYMBOL_GPL(usbnet_skb_return);
254
255 \f
256 /*-------------------------------------------------------------------------
257 *
258 * Network Device Driver (peer link to "Host Device", from USB host)
259 *
260 *-------------------------------------------------------------------------*/
261
262 int usbnet_change_mtu (struct net_device *net, int new_mtu)
263 {
264 struct usbnet *dev = netdev_priv(net);
265 int ll_mtu = new_mtu + net->hard_header_len;
266 int old_hard_mtu = dev->hard_mtu;
267 int old_rx_urb_size = dev->rx_urb_size;
268
269 if (new_mtu <= 0)
270 return -EINVAL;
271 // no second zero-length packet read wanted after mtu-sized packets
272 if ((ll_mtu % dev->maxpacket) == 0)
273 return -EDOM;
274 net->mtu = new_mtu;
275
276 dev->hard_mtu = net->mtu + net->hard_header_len;
277 if (dev->rx_urb_size == old_hard_mtu) {
278 dev->rx_urb_size = dev->hard_mtu;
279 if (dev->rx_urb_size > old_rx_urb_size)
280 usbnet_unlink_rx_urbs(dev);
281 }
282
283 return 0;
284 }
285 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
286
287 /*-------------------------------------------------------------------------*/
288
289 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
290 * completion callbacks. 2.5 should have fixed those bugs...
291 */
292
293 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
294 {
295 unsigned long flags;
296
297 spin_lock_irqsave(&list->lock, flags);
298 __skb_unlink(skb, list);
299 spin_unlock(&list->lock);
300 spin_lock(&dev->done.lock);
301 __skb_queue_tail(&dev->done, skb);
302 if (dev->done.qlen == 1)
303 tasklet_schedule(&dev->bh);
304 spin_unlock_irqrestore(&dev->done.lock, flags);
305 }
306
307 /* some work can't be done in tasklets, so we use keventd
308 *
309 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
310 * but tasklet_schedule() doesn't. hope the failure is rare.
311 */
312 void usbnet_defer_kevent (struct usbnet *dev, int work)
313 {
314 set_bit (work, &dev->flags);
315 if (!schedule_work (&dev->kevent))
316 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
317 else
318 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
319 }
320 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
321
322 /*-------------------------------------------------------------------------*/
323
324 static void rx_complete (struct urb *urb);
325
326 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
327 {
328 struct sk_buff *skb;
329 struct skb_data *entry;
330 int retval = 0;
331 unsigned long lockflags;
332 size_t size = dev->rx_urb_size;
333
334 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
335 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
336 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
337 usb_free_urb (urb);
338 return;
339 }
340 skb_reserve (skb, NET_IP_ALIGN);
341
342 entry = (struct skb_data *) skb->cb;
343 entry->urb = urb;
344 entry->dev = dev;
345 entry->state = rx_start;
346 entry->length = 0;
347
348 usb_fill_bulk_urb (urb, dev->udev, dev->in,
349 skb->data, size, rx_complete, skb);
350
351 spin_lock_irqsave (&dev->rxq.lock, lockflags);
352
353 if (netif_running (dev->net) &&
354 netif_device_present (dev->net) &&
355 !test_bit (EVENT_RX_HALT, &dev->flags) &&
356 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
357 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
358 case -EPIPE:
359 usbnet_defer_kevent (dev, EVENT_RX_HALT);
360 break;
361 case -ENOMEM:
362 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
363 break;
364 case -ENODEV:
365 netif_dbg(dev, ifdown, dev->net, "device gone\n");
366 netif_device_detach (dev->net);
367 break;
368 default:
369 netif_dbg(dev, rx_err, dev->net,
370 "rx submit, %d\n", retval);
371 tasklet_schedule (&dev->bh);
372 break;
373 case 0:
374 __skb_queue_tail (&dev->rxq, skb);
375 }
376 } else {
377 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
378 retval = -ENOLINK;
379 }
380 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
381 if (retval) {
382 dev_kfree_skb_any (skb);
383 usb_free_urb (urb);
384 }
385 }
386
387
388 /*-------------------------------------------------------------------------*/
389
390 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
391 {
392 if (dev->driver_info->rx_fixup &&
393 !dev->driver_info->rx_fixup (dev, skb))
394 goto error;
395 // else network stack removes extra byte if we forced a short packet
396
397 if (skb->len)
398 usbnet_skb_return (dev, skb);
399 else {
400 netif_dbg(dev, rx_err, dev->net, "drop\n");
401 error:
402 dev->net->stats.rx_errors++;
403 skb_queue_tail (&dev->done, skb);
404 }
405 }
406
407 /*-------------------------------------------------------------------------*/
408
409 static void rx_complete (struct urb *urb)
410 {
411 struct sk_buff *skb = (struct sk_buff *) urb->context;
412 struct skb_data *entry = (struct skb_data *) skb->cb;
413 struct usbnet *dev = entry->dev;
414 int urb_status = urb->status;
415
416 skb_put (skb, urb->actual_length);
417 entry->state = rx_done;
418 entry->urb = NULL;
419
420 switch (urb_status) {
421 /* success */
422 case 0:
423 if (skb->len < dev->net->hard_header_len) {
424 entry->state = rx_cleanup;
425 dev->net->stats.rx_errors++;
426 dev->net->stats.rx_length_errors++;
427 netif_dbg(dev, rx_err, dev->net,
428 "rx length %d\n", skb->len);
429 }
430 break;
431
432 /* stalls need manual reset. this is rare ... except that
433 * when going through USB 2.0 TTs, unplug appears this way.
434 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
435 * storm, recovering as needed.
436 */
437 case -EPIPE:
438 dev->net->stats.rx_errors++;
439 usbnet_defer_kevent (dev, EVENT_RX_HALT);
440 // FALLTHROUGH
441
442 /* software-driven interface shutdown */
443 case -ECONNRESET: /* async unlink */
444 case -ESHUTDOWN: /* hardware gone */
445 netif_dbg(dev, ifdown, dev->net,
446 "rx shutdown, code %d\n", urb_status);
447 goto block;
448
449 /* we get controller i/o faults during khubd disconnect() delays.
450 * throttle down resubmits, to avoid log floods; just temporarily,
451 * so we still recover when the fault isn't a khubd delay.
452 */
453 case -EPROTO:
454 case -ETIME:
455 case -EILSEQ:
456 dev->net->stats.rx_errors++;
457 if (!timer_pending (&dev->delay)) {
458 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
459 netif_dbg(dev, link, dev->net,
460 "rx throttle %d\n", urb_status);
461 }
462 block:
463 entry->state = rx_cleanup;
464 entry->urb = urb;
465 urb = NULL;
466 break;
467
468 /* data overrun ... flush fifo? */
469 case -EOVERFLOW:
470 dev->net->stats.rx_over_errors++;
471 // FALLTHROUGH
472
473 default:
474 entry->state = rx_cleanup;
475 dev->net->stats.rx_errors++;
476 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
477 break;
478 }
479
480 defer_bh(dev, skb, &dev->rxq);
481
482 if (urb) {
483 if (netif_running (dev->net) &&
484 !test_bit (EVENT_RX_HALT, &dev->flags)) {
485 rx_submit (dev, urb, GFP_ATOMIC);
486 return;
487 }
488 usb_free_urb (urb);
489 }
490 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
491 }
492
493 static void intr_complete (struct urb *urb)
494 {
495 struct usbnet *dev = urb->context;
496 int status = urb->status;
497
498 switch (status) {
499 /* success */
500 case 0:
501 dev->driver_info->status(dev, urb);
502 break;
503
504 /* software-driven interface shutdown */
505 case -ENOENT: /* urb killed */
506 case -ESHUTDOWN: /* hardware gone */
507 netif_dbg(dev, ifdown, dev->net,
508 "intr shutdown, code %d\n", status);
509 return;
510
511 /* NOTE: not throttling like RX/TX, since this endpoint
512 * already polls infrequently
513 */
514 default:
515 netdev_dbg(dev->net, "intr status %d\n", status);
516 break;
517 }
518
519 if (!netif_running (dev->net))
520 return;
521
522 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
523 status = usb_submit_urb (urb, GFP_ATOMIC);
524 if (status != 0)
525 netif_err(dev, timer, dev->net,
526 "intr resubmit --> %d\n", status);
527 }
528
529 /*-------------------------------------------------------------------------*/
530 void usbnet_pause_rx(struct usbnet *dev)
531 {
532 set_bit(EVENT_RX_PAUSED, &dev->flags);
533
534 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
535 }
536 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
537
538 void usbnet_resume_rx(struct usbnet *dev)
539 {
540 struct sk_buff *skb;
541 int num = 0;
542
543 clear_bit(EVENT_RX_PAUSED, &dev->flags);
544
545 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
546 usbnet_skb_return(dev, skb);
547 num++;
548 }
549
550 tasklet_schedule(&dev->bh);
551
552 netif_dbg(dev, rx_status, dev->net,
553 "paused rx queue disabled, %d skbs requeued\n", num);
554 }
555 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
556
557 void usbnet_purge_paused_rxq(struct usbnet *dev)
558 {
559 skb_queue_purge(&dev->rxq_pause);
560 }
561 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
562
563 /*-------------------------------------------------------------------------*/
564
565 // unlink pending rx/tx; completion handlers do all other cleanup
566
567 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
568 {
569 unsigned long flags;
570 struct sk_buff *skb, *skbnext;
571 int count = 0;
572
573 spin_lock_irqsave (&q->lock, flags);
574 skb_queue_walk_safe(q, skb, skbnext) {
575 struct skb_data *entry;
576 struct urb *urb;
577 int retval;
578
579 entry = (struct skb_data *) skb->cb;
580 urb = entry->urb;
581
582 // during some PM-driven resume scenarios,
583 // these (async) unlinks complete immediately
584 retval = usb_unlink_urb (urb);
585 if (retval != -EINPROGRESS && retval != 0)
586 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
587 else
588 count++;
589 }
590 spin_unlock_irqrestore (&q->lock, flags);
591 return count;
592 }
593
594 // Flush all pending rx urbs
595 // minidrivers may need to do this when the MTU changes
596
597 void usbnet_unlink_rx_urbs(struct usbnet *dev)
598 {
599 if (netif_running(dev->net)) {
600 (void) unlink_urbs (dev, &dev->rxq);
601 tasklet_schedule(&dev->bh);
602 }
603 }
604 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
605
606 /*-------------------------------------------------------------------------*/
607
608 // precondition: never called in_interrupt
609 static void usbnet_terminate_urbs(struct usbnet *dev)
610 {
611 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
612 DECLARE_WAITQUEUE(wait, current);
613 int temp;
614
615 /* ensure there are no more active urbs */
616 add_wait_queue(&unlink_wakeup, &wait);
617 set_current_state(TASK_UNINTERRUPTIBLE);
618 dev->wait = &unlink_wakeup;
619 temp = unlink_urbs(dev, &dev->txq) +
620 unlink_urbs(dev, &dev->rxq);
621
622 /* maybe wait for deletions to finish. */
623 while (!skb_queue_empty(&dev->rxq)
624 && !skb_queue_empty(&dev->txq)
625 && !skb_queue_empty(&dev->done)) {
626 schedule_timeout(UNLINK_TIMEOUT_MS);
627 set_current_state(TASK_UNINTERRUPTIBLE);
628 netif_dbg(dev, ifdown, dev->net,
629 "waited for %d urb completions\n", temp);
630 }
631 set_current_state(TASK_RUNNING);
632 dev->wait = NULL;
633 remove_wait_queue(&unlink_wakeup, &wait);
634 }
635
636 int usbnet_stop (struct net_device *net)
637 {
638 struct usbnet *dev = netdev_priv(net);
639 struct driver_info *info = dev->driver_info;
640 int retval;
641
642 netif_stop_queue (net);
643
644 netif_info(dev, ifdown, dev->net,
645 "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
646 net->stats.rx_packets, net->stats.tx_packets,
647 net->stats.rx_errors, net->stats.tx_errors);
648
649 /* allow minidriver to stop correctly (wireless devices to turn off
650 * radio etc) */
651 if (info->stop) {
652 retval = info->stop(dev);
653 if (retval < 0)
654 netif_info(dev, ifdown, dev->net,
655 "stop fail (%d) usbnet usb-%s-%s, %s\n",
656 retval,
657 dev->udev->bus->bus_name, dev->udev->devpath,
658 info->description);
659 }
660
661 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
662 usbnet_terminate_urbs(dev);
663
664 usb_kill_urb(dev->interrupt);
665
666 usbnet_purge_paused_rxq(dev);
667
668 /* deferred work (task, timer, softirq) must also stop.
669 * can't flush_scheduled_work() until we drop rtnl (later),
670 * else workers could deadlock; so make workers a NOP.
671 */
672 dev->flags = 0;
673 del_timer_sync (&dev->delay);
674 tasklet_kill (&dev->bh);
675 if (info->manage_power)
676 info->manage_power(dev, 0);
677 else
678 usb_autopm_put_interface(dev->intf);
679
680 return 0;
681 }
682 EXPORT_SYMBOL_GPL(usbnet_stop);
683
684 /*-------------------------------------------------------------------------*/
685
686 // posts reads, and enables write queuing
687
688 // precondition: never called in_interrupt
689
690 int usbnet_open (struct net_device *net)
691 {
692 struct usbnet *dev = netdev_priv(net);
693 int retval;
694 struct driver_info *info = dev->driver_info;
695
696 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
697 netif_info(dev, ifup, dev->net,
698 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
699 retval,
700 dev->udev->bus->bus_name,
701 dev->udev->devpath,
702 info->description);
703 goto done_nopm;
704 }
705
706 // put into "known safe" state
707 if (info->reset && (retval = info->reset (dev)) < 0) {
708 netif_info(dev, ifup, dev->net,
709 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
710 retval,
711 dev->udev->bus->bus_name,
712 dev->udev->devpath,
713 info->description);
714 goto done;
715 }
716
717 // insist peer be connected
718 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
719 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
720 goto done;
721 }
722
723 /* start any status interrupt transfer */
724 if (dev->interrupt) {
725 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
726 if (retval < 0) {
727 netif_err(dev, ifup, dev->net,
728 "intr submit %d\n", retval);
729 goto done;
730 }
731 }
732
733 netif_start_queue (net);
734 netif_info(dev, ifup, dev->net,
735 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
736 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
737 dev->net->mtu,
738 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
739 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
740 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
741 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
742 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
743 "simple");
744
745 // delay posting reads until we're fully open
746 tasklet_schedule (&dev->bh);
747 if (info->manage_power) {
748 retval = info->manage_power(dev, 1);
749 if (retval < 0)
750 goto done;
751 usb_autopm_put_interface(dev->intf);
752 }
753 return retval;
754
755 done:
756 usb_autopm_put_interface(dev->intf);
757 done_nopm:
758 return retval;
759 }
760 EXPORT_SYMBOL_GPL(usbnet_open);
761
762 /*-------------------------------------------------------------------------*/
763
764 /* ethtool methods; minidrivers may need to add some more, but
765 * they'll probably want to use this base set.
766 */
767
768 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
769 {
770 struct usbnet *dev = netdev_priv(net);
771
772 if (!dev->mii.mdio_read)
773 return -EOPNOTSUPP;
774
775 return mii_ethtool_gset(&dev->mii, cmd);
776 }
777 EXPORT_SYMBOL_GPL(usbnet_get_settings);
778
779 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
780 {
781 struct usbnet *dev = netdev_priv(net);
782 int retval;
783
784 if (!dev->mii.mdio_write)
785 return -EOPNOTSUPP;
786
787 retval = mii_ethtool_sset(&dev->mii, cmd);
788
789 /* link speed/duplex might have changed */
790 if (dev->driver_info->link_reset)
791 dev->driver_info->link_reset(dev);
792
793 return retval;
794
795 }
796 EXPORT_SYMBOL_GPL(usbnet_set_settings);
797
798 u32 usbnet_get_link (struct net_device *net)
799 {
800 struct usbnet *dev = netdev_priv(net);
801
802 /* If a check_connect is defined, return its result */
803 if (dev->driver_info->check_connect)
804 return dev->driver_info->check_connect (dev) == 0;
805
806 /* if the device has mii operations, use those */
807 if (dev->mii.mdio_read)
808 return mii_link_ok(&dev->mii);
809
810 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
811 return ethtool_op_get_link(net);
812 }
813 EXPORT_SYMBOL_GPL(usbnet_get_link);
814
815 int usbnet_nway_reset(struct net_device *net)
816 {
817 struct usbnet *dev = netdev_priv(net);
818
819 if (!dev->mii.mdio_write)
820 return -EOPNOTSUPP;
821
822 return mii_nway_restart(&dev->mii);
823 }
824 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
825
826 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
827 {
828 struct usbnet *dev = netdev_priv(net);
829
830 strncpy (info->driver, dev->driver_name, sizeof info->driver);
831 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
832 strncpy (info->fw_version, dev->driver_info->description,
833 sizeof info->fw_version);
834 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
835 }
836 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
837
838 u32 usbnet_get_msglevel (struct net_device *net)
839 {
840 struct usbnet *dev = netdev_priv(net);
841
842 return dev->msg_enable;
843 }
844 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
845
846 void usbnet_set_msglevel (struct net_device *net, u32 level)
847 {
848 struct usbnet *dev = netdev_priv(net);
849
850 dev->msg_enable = level;
851 }
852 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
853
854 /* drivers may override default ethtool_ops in their bind() routine */
855 static const struct ethtool_ops usbnet_ethtool_ops = {
856 .get_settings = usbnet_get_settings,
857 .set_settings = usbnet_set_settings,
858 .get_link = usbnet_get_link,
859 .nway_reset = usbnet_nway_reset,
860 .get_drvinfo = usbnet_get_drvinfo,
861 .get_msglevel = usbnet_get_msglevel,
862 .set_msglevel = usbnet_set_msglevel,
863 };
864
865 /*-------------------------------------------------------------------------*/
866
867 /* work that cannot be done in interrupt context uses keventd.
868 *
869 * NOTE: with 2.5 we could do more of this using completion callbacks,
870 * especially now that control transfers can be queued.
871 */
872 static void
873 kevent (struct work_struct *work)
874 {
875 struct usbnet *dev =
876 container_of(work, struct usbnet, kevent);
877 int status;
878
879 /* usb_clear_halt() needs a thread context */
880 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
881 unlink_urbs (dev, &dev->txq);
882 status = usb_autopm_get_interface(dev->intf);
883 if (status < 0)
884 goto fail_pipe;
885 status = usb_clear_halt (dev->udev, dev->out);
886 usb_autopm_put_interface(dev->intf);
887 if (status < 0 &&
888 status != -EPIPE &&
889 status != -ESHUTDOWN) {
890 if (netif_msg_tx_err (dev))
891 fail_pipe:
892 netdev_err(dev->net, "can't clear tx halt, status %d\n",
893 status);
894 } else {
895 clear_bit (EVENT_TX_HALT, &dev->flags);
896 if (status != -ESHUTDOWN)
897 netif_wake_queue (dev->net);
898 }
899 }
900 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
901 unlink_urbs (dev, &dev->rxq);
902 status = usb_autopm_get_interface(dev->intf);
903 if (status < 0)
904 goto fail_halt;
905 status = usb_clear_halt (dev->udev, dev->in);
906 usb_autopm_put_interface(dev->intf);
907 if (status < 0 &&
908 status != -EPIPE &&
909 status != -ESHUTDOWN) {
910 if (netif_msg_rx_err (dev))
911 fail_halt:
912 netdev_err(dev->net, "can't clear rx halt, status %d\n",
913 status);
914 } else {
915 clear_bit (EVENT_RX_HALT, &dev->flags);
916 tasklet_schedule (&dev->bh);
917 }
918 }
919
920 /* tasklet could resubmit itself forever if memory is tight */
921 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
922 struct urb *urb = NULL;
923
924 if (netif_running (dev->net))
925 urb = usb_alloc_urb (0, GFP_KERNEL);
926 else
927 clear_bit (EVENT_RX_MEMORY, &dev->flags);
928 if (urb != NULL) {
929 clear_bit (EVENT_RX_MEMORY, &dev->flags);
930 status = usb_autopm_get_interface(dev->intf);
931 if (status < 0)
932 goto fail_lowmem;
933 rx_submit (dev, urb, GFP_KERNEL);
934 usb_autopm_put_interface(dev->intf);
935 fail_lowmem:
936 tasklet_schedule (&dev->bh);
937 }
938 }
939
940 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
941 struct driver_info *info = dev->driver_info;
942 int retval = 0;
943
944 clear_bit (EVENT_LINK_RESET, &dev->flags);
945 status = usb_autopm_get_interface(dev->intf);
946 if (status < 0)
947 goto skip_reset;
948 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
949 usb_autopm_put_interface(dev->intf);
950 skip_reset:
951 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
952 retval,
953 dev->udev->bus->bus_name,
954 dev->udev->devpath,
955 info->description);
956 } else {
957 usb_autopm_put_interface(dev->intf);
958 }
959 }
960
961 if (dev->flags)
962 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
963 }
964
965 /*-------------------------------------------------------------------------*/
966
967 static void tx_complete (struct urb *urb)
968 {
969 struct sk_buff *skb = (struct sk_buff *) urb->context;
970 struct skb_data *entry = (struct skb_data *) skb->cb;
971 struct usbnet *dev = entry->dev;
972
973 if (urb->status == 0) {
974 dev->net->stats.tx_packets++;
975 dev->net->stats.tx_bytes += entry->length;
976 } else {
977 dev->net->stats.tx_errors++;
978
979 switch (urb->status) {
980 case -EPIPE:
981 usbnet_defer_kevent (dev, EVENT_TX_HALT);
982 break;
983
984 /* software-driven interface shutdown */
985 case -ECONNRESET: // async unlink
986 case -ESHUTDOWN: // hardware gone
987 break;
988
989 // like rx, tx gets controller i/o faults during khubd delays
990 // and so it uses the same throttling mechanism.
991 case -EPROTO:
992 case -ETIME:
993 case -EILSEQ:
994 usb_mark_last_busy(dev->udev);
995 if (!timer_pending (&dev->delay)) {
996 mod_timer (&dev->delay,
997 jiffies + THROTTLE_JIFFIES);
998 netif_dbg(dev, link, dev->net,
999 "tx throttle %d\n", urb->status);
1000 }
1001 netif_stop_queue (dev->net);
1002 break;
1003 default:
1004 netif_dbg(dev, tx_err, dev->net,
1005 "tx err %d\n", entry->urb->status);
1006 break;
1007 }
1008 }
1009
1010 usb_autopm_put_interface_async(dev->intf);
1011 urb->dev = NULL;
1012 entry->state = tx_done;
1013 defer_bh(dev, skb, &dev->txq);
1014 }
1015
1016 /*-------------------------------------------------------------------------*/
1017
1018 void usbnet_tx_timeout (struct net_device *net)
1019 {
1020 struct usbnet *dev = netdev_priv(net);
1021
1022 unlink_urbs (dev, &dev->txq);
1023 tasklet_schedule (&dev->bh);
1024
1025 // FIXME: device recovery -- reset?
1026 }
1027 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1028
1029 /*-------------------------------------------------------------------------*/
1030
1031 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1032 struct net_device *net)
1033 {
1034 struct usbnet *dev = netdev_priv(net);
1035 int length;
1036 struct urb *urb = NULL;
1037 struct skb_data *entry;
1038 struct driver_info *info = dev->driver_info;
1039 unsigned long flags;
1040 int retval;
1041
1042 // some devices want funky USB-level framing, for
1043 // win32 driver (usually) and/or hardware quirks
1044 if (info->tx_fixup) {
1045 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1046 if (!skb) {
1047 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1048 goto drop;
1049 }
1050 }
1051 length = skb->len;
1052
1053 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1054 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1055 goto drop;
1056 }
1057
1058 entry = (struct skb_data *) skb->cb;
1059 entry->urb = urb;
1060 entry->dev = dev;
1061 entry->state = tx_start;
1062 entry->length = length;
1063
1064 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1065 skb->data, skb->len, tx_complete, skb);
1066
1067 /* don't assume the hardware handles USB_ZERO_PACKET
1068 * NOTE: strictly conforming cdc-ether devices should expect
1069 * the ZLP here, but ignore the one-byte packet.
1070 */
1071 if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) {
1072 urb->transfer_buffer_length++;
1073 if (skb_tailroom(skb)) {
1074 skb->data[skb->len] = 0;
1075 __skb_put(skb, 1);
1076 }
1077 }
1078
1079 spin_lock_irqsave(&dev->txq.lock, flags);
1080 retval = usb_autopm_get_interface_async(dev->intf);
1081 if (retval < 0) {
1082 spin_unlock_irqrestore(&dev->txq.lock, flags);
1083 goto drop;
1084 }
1085
1086 #ifdef CONFIG_PM
1087 /* if this triggers the device is still a sleep */
1088 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1089 /* transmission will be done in resume */
1090 usb_anchor_urb(urb, &dev->deferred);
1091 /* no use to process more packets */
1092 netif_stop_queue(net);
1093 spin_unlock_irqrestore(&dev->txq.lock, flags);
1094 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1095 goto deferred;
1096 }
1097 #endif
1098
1099 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1100 case -EPIPE:
1101 netif_stop_queue (net);
1102 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1103 usb_autopm_put_interface_async(dev->intf);
1104 break;
1105 default:
1106 usb_autopm_put_interface_async(dev->intf);
1107 netif_dbg(dev, tx_err, dev->net,
1108 "tx: submit urb err %d\n", retval);
1109 break;
1110 case 0:
1111 net->trans_start = jiffies;
1112 __skb_queue_tail (&dev->txq, skb);
1113 if (dev->txq.qlen >= TX_QLEN (dev))
1114 netif_stop_queue (net);
1115 }
1116 spin_unlock_irqrestore (&dev->txq.lock, flags);
1117
1118 if (retval) {
1119 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1120 drop:
1121 dev->net->stats.tx_dropped++;
1122 if (skb)
1123 dev_kfree_skb_any (skb);
1124 usb_free_urb (urb);
1125 } else
1126 netif_dbg(dev, tx_queued, dev->net,
1127 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1128 #ifdef CONFIG_PM
1129 deferred:
1130 #endif
1131 return NETDEV_TX_OK;
1132 }
1133 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1134
1135 /*-------------------------------------------------------------------------*/
1136
1137 // tasklet (work deferred from completions, in_irq) or timer
1138
1139 static void usbnet_bh (unsigned long param)
1140 {
1141 struct usbnet *dev = (struct usbnet *) param;
1142 struct sk_buff *skb;
1143 struct skb_data *entry;
1144
1145 while ((skb = skb_dequeue (&dev->done))) {
1146 entry = (struct skb_data *) skb->cb;
1147 switch (entry->state) {
1148 case rx_done:
1149 entry->state = rx_cleanup;
1150 rx_process (dev, skb);
1151 continue;
1152 case tx_done:
1153 case rx_cleanup:
1154 usb_free_urb (entry->urb);
1155 dev_kfree_skb (skb);
1156 continue;
1157 default:
1158 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1159 }
1160 }
1161
1162 // waiting for all pending urbs to complete?
1163 if (dev->wait) {
1164 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1165 wake_up (dev->wait);
1166 }
1167
1168 // or are we maybe short a few urbs?
1169 } else if (netif_running (dev->net) &&
1170 netif_device_present (dev->net) &&
1171 !timer_pending (&dev->delay) &&
1172 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1173 int temp = dev->rxq.qlen;
1174 int qlen = RX_QLEN (dev);
1175
1176 if (temp < qlen) {
1177 struct urb *urb;
1178 int i;
1179
1180 // don't refill the queue all at once
1181 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1182 urb = usb_alloc_urb (0, GFP_ATOMIC);
1183 if (urb != NULL)
1184 rx_submit (dev, urb, GFP_ATOMIC);
1185 }
1186 if (temp != dev->rxq.qlen)
1187 netif_dbg(dev, link, dev->net,
1188 "rxqlen %d --> %d\n",
1189 temp, dev->rxq.qlen);
1190 if (dev->rxq.qlen < qlen)
1191 tasklet_schedule (&dev->bh);
1192 }
1193 if (dev->txq.qlen < TX_QLEN (dev))
1194 netif_wake_queue (dev->net);
1195 }
1196 }
1197
1198
1199 /*-------------------------------------------------------------------------
1200 *
1201 * USB Device Driver support
1202 *
1203 *-------------------------------------------------------------------------*/
1204
1205 // precondition: never called in_interrupt
1206
1207 void usbnet_disconnect (struct usb_interface *intf)
1208 {
1209 struct usbnet *dev;
1210 struct usb_device *xdev;
1211 struct net_device *net;
1212
1213 dev = usb_get_intfdata(intf);
1214 usb_set_intfdata(intf, NULL);
1215 if (!dev)
1216 return;
1217
1218 xdev = interface_to_usbdev (intf);
1219
1220 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1221 intf->dev.driver->name,
1222 xdev->bus->bus_name, xdev->devpath,
1223 dev->driver_info->description);
1224
1225 net = dev->net;
1226 unregister_netdev (net);
1227
1228 /* we don't hold rtnl here ... */
1229 flush_scheduled_work ();
1230
1231 if (dev->driver_info->unbind)
1232 dev->driver_info->unbind (dev, intf);
1233
1234 free_netdev(net);
1235 usb_put_dev (xdev);
1236 }
1237 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1238
1239 static const struct net_device_ops usbnet_netdev_ops = {
1240 .ndo_open = usbnet_open,
1241 .ndo_stop = usbnet_stop,
1242 .ndo_start_xmit = usbnet_start_xmit,
1243 .ndo_tx_timeout = usbnet_tx_timeout,
1244 .ndo_change_mtu = usbnet_change_mtu,
1245 .ndo_set_mac_address = eth_mac_addr,
1246 .ndo_validate_addr = eth_validate_addr,
1247 };
1248
1249 /*-------------------------------------------------------------------------*/
1250
1251 // precondition: never called in_interrupt
1252
1253 static struct device_type wlan_type = {
1254 .name = "wlan",
1255 };
1256
1257 static struct device_type wwan_type = {
1258 .name = "wwan",
1259 };
1260
1261 int
1262 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1263 {
1264 struct usbnet *dev;
1265 struct net_device *net;
1266 struct usb_host_interface *interface;
1267 struct driver_info *info;
1268 struct usb_device *xdev;
1269 int status;
1270 const char *name;
1271
1272 name = udev->dev.driver->name;
1273 info = (struct driver_info *) prod->driver_info;
1274 if (!info) {
1275 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1276 return -ENODEV;
1277 }
1278 xdev = interface_to_usbdev (udev);
1279 interface = udev->cur_altsetting;
1280
1281 usb_get_dev (xdev);
1282
1283 status = -ENOMEM;
1284
1285 // set up our own records
1286 net = alloc_etherdev(sizeof(*dev));
1287 if (!net) {
1288 dbg ("can't kmalloc dev");
1289 goto out;
1290 }
1291
1292 dev = netdev_priv(net);
1293 dev->udev = xdev;
1294 dev->intf = udev;
1295 dev->driver_info = info;
1296 dev->driver_name = name;
1297 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1298 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1299 skb_queue_head_init (&dev->rxq);
1300 skb_queue_head_init (&dev->txq);
1301 skb_queue_head_init (&dev->done);
1302 skb_queue_head_init(&dev->rxq_pause);
1303 dev->bh.func = usbnet_bh;
1304 dev->bh.data = (unsigned long) dev;
1305 INIT_WORK (&dev->kevent, kevent);
1306 init_usb_anchor(&dev->deferred);
1307 dev->delay.function = usbnet_bh;
1308 dev->delay.data = (unsigned long) dev;
1309 init_timer (&dev->delay);
1310 mutex_init (&dev->phy_mutex);
1311
1312 dev->net = net;
1313 strcpy (net->name, "usb%d");
1314 memcpy (net->dev_addr, node_id, sizeof node_id);
1315
1316 /* rx and tx sides can use different message sizes;
1317 * bind() should set rx_urb_size in that case.
1318 */
1319 dev->hard_mtu = net->mtu + net->hard_header_len;
1320 #if 0
1321 // dma_supported() is deeply broken on almost all architectures
1322 // possible with some EHCI controllers
1323 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1324 net->features |= NETIF_F_HIGHDMA;
1325 #endif
1326
1327 net->netdev_ops = &usbnet_netdev_ops;
1328 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1329 net->ethtool_ops = &usbnet_ethtool_ops;
1330
1331 // allow device-specific bind/init procedures
1332 // NOTE net->name still not usable ...
1333 if (info->bind) {
1334 status = info->bind (dev, udev);
1335 if (status < 0)
1336 goto out1;
1337
1338 // heuristic: "usb%d" for links we know are two-host,
1339 // else "eth%d" when there's reasonable doubt. userspace
1340 // can rename the link if it knows better.
1341 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1342 (net->dev_addr [0] & 0x02) == 0)
1343 strcpy (net->name, "eth%d");
1344 /* WLAN devices should always be named "wlan%d" */
1345 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1346 strcpy(net->name, "wlan%d");
1347 /* WWAN devices should always be named "wwan%d" */
1348 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1349 strcpy(net->name, "wwan%d");
1350
1351 /* maybe the remote can't receive an Ethernet MTU */
1352 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1353 net->mtu = dev->hard_mtu - net->hard_header_len;
1354 } else if (!info->in || !info->out)
1355 status = usbnet_get_endpoints (dev, udev);
1356 else {
1357 dev->in = usb_rcvbulkpipe (xdev, info->in);
1358 dev->out = usb_sndbulkpipe (xdev, info->out);
1359 if (!(info->flags & FLAG_NO_SETINT))
1360 status = usb_set_interface (xdev,
1361 interface->desc.bInterfaceNumber,
1362 interface->desc.bAlternateSetting);
1363 else
1364 status = 0;
1365
1366 }
1367 if (status >= 0 && dev->status)
1368 status = init_status (dev, udev);
1369 if (status < 0)
1370 goto out3;
1371
1372 if (!dev->rx_urb_size)
1373 dev->rx_urb_size = dev->hard_mtu;
1374 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1375
1376 SET_NETDEV_DEV(net, &udev->dev);
1377
1378 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1379 SET_NETDEV_DEVTYPE(net, &wlan_type);
1380 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1381 SET_NETDEV_DEVTYPE(net, &wwan_type);
1382
1383 status = register_netdev (net);
1384 if (status)
1385 goto out3;
1386 netif_info(dev, probe, dev->net,
1387 "register '%s' at usb-%s-%s, %s, %pM\n",
1388 udev->dev.driver->name,
1389 xdev->bus->bus_name, xdev->devpath,
1390 dev->driver_info->description,
1391 net->dev_addr);
1392
1393 // ok, it's ready to go.
1394 usb_set_intfdata (udev, dev);
1395
1396 netif_device_attach (net);
1397
1398 if (dev->driver_info->flags & FLAG_LINK_INTR)
1399 netif_carrier_off(net);
1400
1401 return 0;
1402
1403 out3:
1404 if (info->unbind)
1405 info->unbind (dev, udev);
1406 out1:
1407 free_netdev(net);
1408 out:
1409 usb_put_dev(xdev);
1410 return status;
1411 }
1412 EXPORT_SYMBOL_GPL(usbnet_probe);
1413
1414 /*-------------------------------------------------------------------------*/
1415
1416 /*
1417 * suspend the whole driver as soon as the first interface is suspended
1418 * resume only when the last interface is resumed
1419 */
1420
1421 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1422 {
1423 struct usbnet *dev = usb_get_intfdata(intf);
1424
1425 if (!dev->suspend_count++) {
1426 spin_lock_irq(&dev->txq.lock);
1427 /* don't autosuspend while transmitting */
1428 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1429 spin_unlock_irq(&dev->txq.lock);
1430 return -EBUSY;
1431 } else {
1432 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1433 spin_unlock_irq(&dev->txq.lock);
1434 }
1435 /*
1436 * accelerate emptying of the rx and queues, to avoid
1437 * having everything error out.
1438 */
1439 netif_device_detach (dev->net);
1440 usbnet_terminate_urbs(dev);
1441 usb_kill_urb(dev->interrupt);
1442
1443 /*
1444 * reattach so runtime management can use and
1445 * wake the device
1446 */
1447 netif_device_attach (dev->net);
1448 }
1449 return 0;
1450 }
1451 EXPORT_SYMBOL_GPL(usbnet_suspend);
1452
1453 int usbnet_resume (struct usb_interface *intf)
1454 {
1455 struct usbnet *dev = usb_get_intfdata(intf);
1456 struct sk_buff *skb;
1457 struct urb *res;
1458 int retval;
1459
1460 if (!--dev->suspend_count) {
1461 spin_lock_irq(&dev->txq.lock);
1462 while ((res = usb_get_from_anchor(&dev->deferred))) {
1463
1464 printk(KERN_INFO"%s has delayed data\n", __func__);
1465 skb = (struct sk_buff *)res->context;
1466 retval = usb_submit_urb(res, GFP_ATOMIC);
1467 if (retval < 0) {
1468 dev_kfree_skb_any(skb);
1469 usb_free_urb(res);
1470 usb_autopm_put_interface_async(dev->intf);
1471 } else {
1472 dev->net->trans_start = jiffies;
1473 __skb_queue_tail(&dev->txq, skb);
1474 }
1475 }
1476
1477 smp_mb();
1478 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1479 spin_unlock_irq(&dev->txq.lock);
1480 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1481 netif_start_queue(dev->net);
1482 tasklet_schedule (&dev->bh);
1483 }
1484 return 0;
1485 }
1486 EXPORT_SYMBOL_GPL(usbnet_resume);
1487
1488
1489 /*-------------------------------------------------------------------------*/
1490
1491 static int __init usbnet_init(void)
1492 {
1493 /* compiler should optimize this out */
1494 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1495 < sizeof (struct skb_data));
1496
1497 random_ether_addr(node_id);
1498 return 0;
1499 }
1500 module_init(usbnet_init);
1501
1502 static void __exit usbnet_exit(void)
1503 {
1504 }
1505 module_exit(usbnet_exit);
1506
1507 MODULE_AUTHOR("David Brownell");
1508 MODULE_DESCRIPTION("USB network driver framework");
1509 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree