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usbnet: consider device busy at each recieved packet
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / usb / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
49
50 #define DRIVER_VERSION "22-Aug-2005"
51
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
65 */
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
71
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
74
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
78
79 // between wakeups
80 #define UNLINK_TIMEOUT_MS 3
81
82 /*-------------------------------------------------------------------------*/
83
84 // randomly generated ethernet address
85 static u8 node_id [ETH_ALEN];
86
87 static const char driver_name [] = "usbnet";
88
89 /* use ethtool to change the level for any given device */
90 static int msg_level = -1;
91 module_param (msg_level, int, 0);
92 MODULE_PARM_DESC (msg_level, "Override default message level");
93
94 /*-------------------------------------------------------------------------*/
95
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
98 {
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsettings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
130 if (usb_endpoint_dir_in(&e->desc)) {
131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
153
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160 }
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
162
163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164 {
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
179 return 0;
180 }
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
183 static void intr_complete (struct urb *urb);
184
185 static int init_status (struct usbnet *dev, struct usb_interface *intf)
186 {
187 char *buf = NULL;
188 unsigned pipe = 0;
189 unsigned maxp;
190 unsigned period;
191
192 if (!dev->driver_info->status)
193 return 0;
194
195 pipe = usb_rcvintpipe (dev->udev,
196 dev->status->desc.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK);
198 maxp = usb_maxpacket (dev->udev, pipe, 0);
199
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period = max ((int) dev->status->desc.bInterval,
202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
203
204 buf = kmalloc (maxp, GFP_KERNEL);
205 if (buf) {
206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
207 if (!dev->interrupt) {
208 kfree (buf);
209 return -ENOMEM;
210 } else {
211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
212 buf, maxp, intr_complete, dev, period);
213 dev_dbg(&intf->dev,
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe), maxp, period);
216 }
217 }
218 return 0;
219 }
220
221 /* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
224 */
225 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
226 {
227 int status;
228
229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
230 skb_queue_tail(&dev->rxq_pause, skb);
231 return;
232 }
233
234 skb->protocol = eth_type_trans (skb, dev->net);
235 dev->net->stats.rx_packets++;
236 dev->net->stats.rx_bytes += skb->len;
237
238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
239 skb->len + sizeof (struct ethhdr), skb->protocol);
240 memset (skb->cb, 0, sizeof (struct skb_data));
241
242 if (skb_defer_rx_timestamp(skb))
243 return;
244
245 status = netif_rx (skb);
246 if (status != NET_RX_SUCCESS)
247 netif_dbg(dev, rx_err, dev->net,
248 "netif_rx status %d\n", status);
249 }
250 EXPORT_SYMBOL_GPL(usbnet_skb_return);
251
252 \f
253 /*-------------------------------------------------------------------------
254 *
255 * Network Device Driver (peer link to "Host Device", from USB host)
256 *
257 *-------------------------------------------------------------------------*/
258
259 int usbnet_change_mtu (struct net_device *net, int new_mtu)
260 {
261 struct usbnet *dev = netdev_priv(net);
262 int ll_mtu = new_mtu + net->hard_header_len;
263 int old_hard_mtu = dev->hard_mtu;
264 int old_rx_urb_size = dev->rx_urb_size;
265
266 if (new_mtu <= 0)
267 return -EINVAL;
268 // no second zero-length packet read wanted after mtu-sized packets
269 if ((ll_mtu % dev->maxpacket) == 0)
270 return -EDOM;
271 net->mtu = new_mtu;
272
273 dev->hard_mtu = net->mtu + net->hard_header_len;
274 if (dev->rx_urb_size == old_hard_mtu) {
275 dev->rx_urb_size = dev->hard_mtu;
276 if (dev->rx_urb_size > old_rx_urb_size)
277 usbnet_unlink_rx_urbs(dev);
278 }
279
280 return 0;
281 }
282 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
283
284 /*-------------------------------------------------------------------------*/
285
286 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
287 * completion callbacks. 2.5 should have fixed those bugs...
288 */
289
290 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
291 {
292 unsigned long flags;
293
294 spin_lock_irqsave(&list->lock, flags);
295 __skb_unlink(skb, list);
296 spin_unlock(&list->lock);
297 spin_lock(&dev->done.lock);
298 __skb_queue_tail(&dev->done, skb);
299 if (dev->done.qlen == 1)
300 tasklet_schedule(&dev->bh);
301 spin_unlock_irqrestore(&dev->done.lock, flags);
302 }
303
304 /* some work can't be done in tasklets, so we use keventd
305 *
306 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
307 * but tasklet_schedule() doesn't. hope the failure is rare.
308 */
309 void usbnet_defer_kevent (struct usbnet *dev, int work)
310 {
311 set_bit (work, &dev->flags);
312 if (!schedule_work (&dev->kevent))
313 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
314 else
315 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
316 }
317 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
318
319 /*-------------------------------------------------------------------------*/
320
321 static void rx_complete (struct urb *urb);
322
323 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
324 {
325 struct sk_buff *skb;
326 struct skb_data *entry;
327 int retval = 0;
328 unsigned long lockflags;
329 size_t size = dev->rx_urb_size;
330
331 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
332 if (!skb) {
333 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
334 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
335 usb_free_urb (urb);
336 return -ENOMEM;
337 }
338
339 entry = (struct skb_data *) skb->cb;
340 entry->urb = urb;
341 entry->dev = dev;
342 entry->state = rx_start;
343 entry->length = 0;
344
345 usb_fill_bulk_urb (urb, dev->udev, dev->in,
346 skb->data, size, rx_complete, skb);
347
348 spin_lock_irqsave (&dev->rxq.lock, lockflags);
349
350 if (netif_running (dev->net) &&
351 netif_device_present (dev->net) &&
352 !test_bit (EVENT_RX_HALT, &dev->flags) &&
353 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
354 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
355 case -EPIPE:
356 usbnet_defer_kevent (dev, EVENT_RX_HALT);
357 break;
358 case -ENOMEM:
359 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
360 break;
361 case -ENODEV:
362 netif_dbg(dev, ifdown, dev->net, "device gone\n");
363 netif_device_detach (dev->net);
364 break;
365 case -EHOSTUNREACH:
366 retval = -ENOLINK;
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 return retval;
386 }
387
388
389 /*-------------------------------------------------------------------------*/
390
391 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
392 {
393 if (dev->driver_info->rx_fixup &&
394 !dev->driver_info->rx_fixup (dev, skb)) {
395 /* With RX_ASSEMBLE, rx_fixup() must update counters */
396 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
397 dev->net->stats.rx_errors++;
398 goto done;
399 }
400 // else network stack removes extra byte if we forced a short packet
401
402 if (skb->len) {
403 /* all data was already cloned from skb inside the driver */
404 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
405 dev_kfree_skb_any(skb);
406 else
407 usbnet_skb_return(dev, skb);
408 return;
409 }
410
411 netif_dbg(dev, rx_err, dev->net, "drop\n");
412 dev->net->stats.rx_errors++;
413 done:
414 skb_queue_tail(&dev->done, skb);
415 }
416
417 /*-------------------------------------------------------------------------*/
418
419 static void rx_complete (struct urb *urb)
420 {
421 struct sk_buff *skb = (struct sk_buff *) urb->context;
422 struct skb_data *entry = (struct skb_data *) skb->cb;
423 struct usbnet *dev = entry->dev;
424 int urb_status = urb->status;
425
426 skb_put (skb, urb->actual_length);
427 entry->state = rx_done;
428 entry->urb = NULL;
429
430 switch (urb_status) {
431 /* success */
432 case 0:
433 if (skb->len < dev->net->hard_header_len) {
434 entry->state = rx_cleanup;
435 dev->net->stats.rx_errors++;
436 dev->net->stats.rx_length_errors++;
437 netif_dbg(dev, rx_err, dev->net,
438 "rx length %d\n", skb->len);
439 }
440 break;
441
442 /* stalls need manual reset. this is rare ... except that
443 * when going through USB 2.0 TTs, unplug appears this way.
444 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
445 * storm, recovering as needed.
446 */
447 case -EPIPE:
448 dev->net->stats.rx_errors++;
449 usbnet_defer_kevent (dev, EVENT_RX_HALT);
450 // FALLTHROUGH
451
452 /* software-driven interface shutdown */
453 case -ECONNRESET: /* async unlink */
454 case -ESHUTDOWN: /* hardware gone */
455 netif_dbg(dev, ifdown, dev->net,
456 "rx shutdown, code %d\n", urb_status);
457 goto block;
458
459 /* we get controller i/o faults during khubd disconnect() delays.
460 * throttle down resubmits, to avoid log floods; just temporarily,
461 * so we still recover when the fault isn't a khubd delay.
462 */
463 case -EPROTO:
464 case -ETIME:
465 case -EILSEQ:
466 dev->net->stats.rx_errors++;
467 if (!timer_pending (&dev->delay)) {
468 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
469 netif_dbg(dev, link, dev->net,
470 "rx throttle %d\n", urb_status);
471 }
472 block:
473 entry->state = rx_cleanup;
474 entry->urb = urb;
475 urb = NULL;
476 break;
477
478 /* data overrun ... flush fifo? */
479 case -EOVERFLOW:
480 dev->net->stats.rx_over_errors++;
481 // FALLTHROUGH
482
483 default:
484 entry->state = rx_cleanup;
485 dev->net->stats.rx_errors++;
486 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
487 break;
488 }
489
490 defer_bh(dev, skb, &dev->rxq);
491
492 if (urb) {
493 if (netif_running (dev->net) &&
494 !test_bit (EVENT_RX_HALT, &dev->flags)) {
495 rx_submit (dev, urb, GFP_ATOMIC);
496 usb_mark_last_busy(dev->udev);
497 return;
498 }
499 usb_free_urb (urb);
500 }
501 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
502 }
503
504 static void intr_complete (struct urb *urb)
505 {
506 struct usbnet *dev = urb->context;
507 int status = urb->status;
508
509 switch (status) {
510 /* success */
511 case 0:
512 dev->driver_info->status(dev, urb);
513 break;
514
515 /* software-driven interface shutdown */
516 case -ENOENT: /* urb killed */
517 case -ESHUTDOWN: /* hardware gone */
518 netif_dbg(dev, ifdown, dev->net,
519 "intr shutdown, code %d\n", status);
520 return;
521
522 /* NOTE: not throttling like RX/TX, since this endpoint
523 * already polls infrequently
524 */
525 default:
526 netdev_dbg(dev->net, "intr status %d\n", status);
527 break;
528 }
529
530 if (!netif_running (dev->net))
531 return;
532
533 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
534 status = usb_submit_urb (urb, GFP_ATOMIC);
535 if (status != 0)
536 netif_err(dev, timer, dev->net,
537 "intr resubmit --> %d\n", status);
538 }
539
540 /*-------------------------------------------------------------------------*/
541 void usbnet_pause_rx(struct usbnet *dev)
542 {
543 set_bit(EVENT_RX_PAUSED, &dev->flags);
544
545 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
546 }
547 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
548
549 void usbnet_resume_rx(struct usbnet *dev)
550 {
551 struct sk_buff *skb;
552 int num = 0;
553
554 clear_bit(EVENT_RX_PAUSED, &dev->flags);
555
556 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
557 usbnet_skb_return(dev, skb);
558 num++;
559 }
560
561 tasklet_schedule(&dev->bh);
562
563 netif_dbg(dev, rx_status, dev->net,
564 "paused rx queue disabled, %d skbs requeued\n", num);
565 }
566 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
567
568 void usbnet_purge_paused_rxq(struct usbnet *dev)
569 {
570 skb_queue_purge(&dev->rxq_pause);
571 }
572 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
573
574 /*-------------------------------------------------------------------------*/
575
576 // unlink pending rx/tx; completion handlers do all other cleanup
577
578 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
579 {
580 unsigned long flags;
581 struct sk_buff *skb, *skbnext;
582 int count = 0;
583
584 spin_lock_irqsave (&q->lock, flags);
585 skb_queue_walk_safe(q, skb, skbnext) {
586 struct skb_data *entry;
587 struct urb *urb;
588 int retval;
589
590 entry = (struct skb_data *) skb->cb;
591 urb = entry->urb;
592
593 /*
594 * Get reference count of the URB to avoid it to be
595 * freed during usb_unlink_urb, which may trigger
596 * use-after-free problem inside usb_unlink_urb since
597 * usb_unlink_urb is always racing with .complete
598 * handler(include defer_bh).
599 */
600 usb_get_urb(urb);
601 spin_unlock_irqrestore(&q->lock, flags);
602 // during some PM-driven resume scenarios,
603 // these (async) unlinks complete immediately
604 retval = usb_unlink_urb (urb);
605 if (retval != -EINPROGRESS && retval != 0)
606 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
607 else
608 count++;
609 usb_put_urb(urb);
610 spin_lock_irqsave(&q->lock, flags);
611 }
612 spin_unlock_irqrestore (&q->lock, flags);
613 return count;
614 }
615
616 // Flush all pending rx urbs
617 // minidrivers may need to do this when the MTU changes
618
619 void usbnet_unlink_rx_urbs(struct usbnet *dev)
620 {
621 if (netif_running(dev->net)) {
622 (void) unlink_urbs (dev, &dev->rxq);
623 tasklet_schedule(&dev->bh);
624 }
625 }
626 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
627
628 /*-------------------------------------------------------------------------*/
629
630 // precondition: never called in_interrupt
631 static void usbnet_terminate_urbs(struct usbnet *dev)
632 {
633 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
634 DECLARE_WAITQUEUE(wait, current);
635 int temp;
636
637 /* ensure there are no more active urbs */
638 add_wait_queue(&unlink_wakeup, &wait);
639 set_current_state(TASK_UNINTERRUPTIBLE);
640 dev->wait = &unlink_wakeup;
641 temp = unlink_urbs(dev, &dev->txq) +
642 unlink_urbs(dev, &dev->rxq);
643
644 /* maybe wait for deletions to finish. */
645 while (!skb_queue_empty(&dev->rxq)
646 && !skb_queue_empty(&dev->txq)
647 && !skb_queue_empty(&dev->done)) {
648 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
649 set_current_state(TASK_UNINTERRUPTIBLE);
650 netif_dbg(dev, ifdown, dev->net,
651 "waited for %d urb completions\n", temp);
652 }
653 set_current_state(TASK_RUNNING);
654 dev->wait = NULL;
655 remove_wait_queue(&unlink_wakeup, &wait);
656 }
657
658 int usbnet_stop (struct net_device *net)
659 {
660 struct usbnet *dev = netdev_priv(net);
661 struct driver_info *info = dev->driver_info;
662 int retval;
663
664 clear_bit(EVENT_DEV_OPEN, &dev->flags);
665 netif_stop_queue (net);
666
667 netif_info(dev, ifdown, dev->net,
668 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
669 net->stats.rx_packets, net->stats.tx_packets,
670 net->stats.rx_errors, net->stats.tx_errors);
671
672 /* allow minidriver to stop correctly (wireless devices to turn off
673 * radio etc) */
674 if (info->stop) {
675 retval = info->stop(dev);
676 if (retval < 0)
677 netif_info(dev, ifdown, dev->net,
678 "stop fail (%d) usbnet usb-%s-%s, %s\n",
679 retval,
680 dev->udev->bus->bus_name, dev->udev->devpath,
681 info->description);
682 }
683
684 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
685 usbnet_terminate_urbs(dev);
686
687 usb_kill_urb(dev->interrupt);
688
689 usbnet_purge_paused_rxq(dev);
690
691 /* deferred work (task, timer, softirq) must also stop.
692 * can't flush_scheduled_work() until we drop rtnl (later),
693 * else workers could deadlock; so make workers a NOP.
694 */
695 dev->flags = 0;
696 del_timer_sync (&dev->delay);
697 tasklet_kill (&dev->bh);
698 if (info->manage_power)
699 info->manage_power(dev, 0);
700 else
701 usb_autopm_put_interface(dev->intf);
702
703 return 0;
704 }
705 EXPORT_SYMBOL_GPL(usbnet_stop);
706
707 /*-------------------------------------------------------------------------*/
708
709 // posts reads, and enables write queuing
710
711 // precondition: never called in_interrupt
712
713 int usbnet_open (struct net_device *net)
714 {
715 struct usbnet *dev = netdev_priv(net);
716 int retval;
717 struct driver_info *info = dev->driver_info;
718
719 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
720 netif_info(dev, ifup, dev->net,
721 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
722 retval,
723 dev->udev->bus->bus_name,
724 dev->udev->devpath,
725 info->description);
726 goto done_nopm;
727 }
728
729 // put into "known safe" state
730 if (info->reset && (retval = info->reset (dev)) < 0) {
731 netif_info(dev, ifup, dev->net,
732 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
733 retval,
734 dev->udev->bus->bus_name,
735 dev->udev->devpath,
736 info->description);
737 goto done;
738 }
739
740 // insist peer be connected
741 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
742 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
743 goto done;
744 }
745
746 /* start any status interrupt transfer */
747 if (dev->interrupt) {
748 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
749 if (retval < 0) {
750 netif_err(dev, ifup, dev->net,
751 "intr submit %d\n", retval);
752 goto done;
753 }
754 }
755
756 set_bit(EVENT_DEV_OPEN, &dev->flags);
757 netif_start_queue (net);
758 netif_info(dev, ifup, dev->net,
759 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
760 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
761 dev->net->mtu,
762 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
763 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
764 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
765 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
766 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
767 "simple");
768
769 // delay posting reads until we're fully open
770 tasklet_schedule (&dev->bh);
771 if (info->manage_power) {
772 retval = info->manage_power(dev, 1);
773 if (retval < 0)
774 goto done;
775 usb_autopm_put_interface(dev->intf);
776 }
777 return retval;
778
779 done:
780 usb_autopm_put_interface(dev->intf);
781 done_nopm:
782 return retval;
783 }
784 EXPORT_SYMBOL_GPL(usbnet_open);
785
786 /*-------------------------------------------------------------------------*/
787
788 /* ethtool methods; minidrivers may need to add some more, but
789 * they'll probably want to use this base set.
790 */
791
792 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
793 {
794 struct usbnet *dev = netdev_priv(net);
795
796 if (!dev->mii.mdio_read)
797 return -EOPNOTSUPP;
798
799 return mii_ethtool_gset(&dev->mii, cmd);
800 }
801 EXPORT_SYMBOL_GPL(usbnet_get_settings);
802
803 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
804 {
805 struct usbnet *dev = netdev_priv(net);
806 int retval;
807
808 if (!dev->mii.mdio_write)
809 return -EOPNOTSUPP;
810
811 retval = mii_ethtool_sset(&dev->mii, cmd);
812
813 /* link speed/duplex might have changed */
814 if (dev->driver_info->link_reset)
815 dev->driver_info->link_reset(dev);
816
817 return retval;
818
819 }
820 EXPORT_SYMBOL_GPL(usbnet_set_settings);
821
822 u32 usbnet_get_link (struct net_device *net)
823 {
824 struct usbnet *dev = netdev_priv(net);
825
826 /* If a check_connect is defined, return its result */
827 if (dev->driver_info->check_connect)
828 return dev->driver_info->check_connect (dev) == 0;
829
830 /* if the device has mii operations, use those */
831 if (dev->mii.mdio_read)
832 return mii_link_ok(&dev->mii);
833
834 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
835 return ethtool_op_get_link(net);
836 }
837 EXPORT_SYMBOL_GPL(usbnet_get_link);
838
839 int usbnet_nway_reset(struct net_device *net)
840 {
841 struct usbnet *dev = netdev_priv(net);
842
843 if (!dev->mii.mdio_write)
844 return -EOPNOTSUPP;
845
846 return mii_nway_restart(&dev->mii);
847 }
848 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
849
850 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
851 {
852 struct usbnet *dev = netdev_priv(net);
853
854 strncpy (info->driver, dev->driver_name, sizeof info->driver);
855 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
856 strncpy (info->fw_version, dev->driver_info->description,
857 sizeof info->fw_version);
858 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
859 }
860 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
861
862 u32 usbnet_get_msglevel (struct net_device *net)
863 {
864 struct usbnet *dev = netdev_priv(net);
865
866 return dev->msg_enable;
867 }
868 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
869
870 void usbnet_set_msglevel (struct net_device *net, u32 level)
871 {
872 struct usbnet *dev = netdev_priv(net);
873
874 dev->msg_enable = level;
875 }
876 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
877
878 /* drivers may override default ethtool_ops in their bind() routine */
879 static const struct ethtool_ops usbnet_ethtool_ops = {
880 .get_settings = usbnet_get_settings,
881 .set_settings = usbnet_set_settings,
882 .get_link = usbnet_get_link,
883 .nway_reset = usbnet_nway_reset,
884 .get_drvinfo = usbnet_get_drvinfo,
885 .get_msglevel = usbnet_get_msglevel,
886 .set_msglevel = usbnet_set_msglevel,
887 };
888
889 /*-------------------------------------------------------------------------*/
890
891 /* work that cannot be done in interrupt context uses keventd.
892 *
893 * NOTE: with 2.5 we could do more of this using completion callbacks,
894 * especially now that control transfers can be queued.
895 */
896 static void
897 kevent (struct work_struct *work)
898 {
899 struct usbnet *dev =
900 container_of(work, struct usbnet, kevent);
901 int status;
902
903 /* usb_clear_halt() needs a thread context */
904 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
905 unlink_urbs (dev, &dev->txq);
906 status = usb_autopm_get_interface(dev->intf);
907 if (status < 0)
908 goto fail_pipe;
909 status = usb_clear_halt (dev->udev, dev->out);
910 usb_autopm_put_interface(dev->intf);
911 if (status < 0 &&
912 status != -EPIPE &&
913 status != -ESHUTDOWN) {
914 if (netif_msg_tx_err (dev))
915 fail_pipe:
916 netdev_err(dev->net, "can't clear tx halt, status %d\n",
917 status);
918 } else {
919 clear_bit (EVENT_TX_HALT, &dev->flags);
920 if (status != -ESHUTDOWN)
921 netif_wake_queue (dev->net);
922 }
923 }
924 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
925 unlink_urbs (dev, &dev->rxq);
926 status = usb_autopm_get_interface(dev->intf);
927 if (status < 0)
928 goto fail_halt;
929 status = usb_clear_halt (dev->udev, dev->in);
930 usb_autopm_put_interface(dev->intf);
931 if (status < 0 &&
932 status != -EPIPE &&
933 status != -ESHUTDOWN) {
934 if (netif_msg_rx_err (dev))
935 fail_halt:
936 netdev_err(dev->net, "can't clear rx halt, status %d\n",
937 status);
938 } else {
939 clear_bit (EVENT_RX_HALT, &dev->flags);
940 tasklet_schedule (&dev->bh);
941 }
942 }
943
944 /* tasklet could resubmit itself forever if memory is tight */
945 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
946 struct urb *urb = NULL;
947 int resched = 1;
948
949 if (netif_running (dev->net))
950 urb = usb_alloc_urb (0, GFP_KERNEL);
951 else
952 clear_bit (EVENT_RX_MEMORY, &dev->flags);
953 if (urb != NULL) {
954 clear_bit (EVENT_RX_MEMORY, &dev->flags);
955 status = usb_autopm_get_interface(dev->intf);
956 if (status < 0) {
957 usb_free_urb(urb);
958 goto fail_lowmem;
959 }
960 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
961 resched = 0;
962 usb_autopm_put_interface(dev->intf);
963 fail_lowmem:
964 if (resched)
965 tasklet_schedule (&dev->bh);
966 }
967 }
968
969 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
970 struct driver_info *info = dev->driver_info;
971 int retval = 0;
972
973 clear_bit (EVENT_LINK_RESET, &dev->flags);
974 status = usb_autopm_get_interface(dev->intf);
975 if (status < 0)
976 goto skip_reset;
977 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
978 usb_autopm_put_interface(dev->intf);
979 skip_reset:
980 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
981 retval,
982 dev->udev->bus->bus_name,
983 dev->udev->devpath,
984 info->description);
985 } else {
986 usb_autopm_put_interface(dev->intf);
987 }
988 }
989
990 if (dev->flags)
991 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
992 }
993
994 /*-------------------------------------------------------------------------*/
995
996 static void tx_complete (struct urb *urb)
997 {
998 struct sk_buff *skb = (struct sk_buff *) urb->context;
999 struct skb_data *entry = (struct skb_data *) skb->cb;
1000 struct usbnet *dev = entry->dev;
1001
1002 if (urb->status == 0) {
1003 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1004 dev->net->stats.tx_packets++;
1005 dev->net->stats.tx_bytes += entry->length;
1006 } else {
1007 dev->net->stats.tx_errors++;
1008
1009 switch (urb->status) {
1010 case -EPIPE:
1011 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1012 break;
1013
1014 /* software-driven interface shutdown */
1015 case -ECONNRESET: // async unlink
1016 case -ESHUTDOWN: // hardware gone
1017 break;
1018
1019 // like rx, tx gets controller i/o faults during khubd delays
1020 // and so it uses the same throttling mechanism.
1021 case -EPROTO:
1022 case -ETIME:
1023 case -EILSEQ:
1024 usb_mark_last_busy(dev->udev);
1025 if (!timer_pending (&dev->delay)) {
1026 mod_timer (&dev->delay,
1027 jiffies + THROTTLE_JIFFIES);
1028 netif_dbg(dev, link, dev->net,
1029 "tx throttle %d\n", urb->status);
1030 }
1031 netif_stop_queue (dev->net);
1032 break;
1033 default:
1034 netif_dbg(dev, tx_err, dev->net,
1035 "tx err %d\n", entry->urb->status);
1036 break;
1037 }
1038 }
1039
1040 usb_autopm_put_interface_async(dev->intf);
1041 entry->state = tx_done;
1042 defer_bh(dev, skb, &dev->txq);
1043 }
1044
1045 /*-------------------------------------------------------------------------*/
1046
1047 void usbnet_tx_timeout (struct net_device *net)
1048 {
1049 struct usbnet *dev = netdev_priv(net);
1050
1051 unlink_urbs (dev, &dev->txq);
1052 tasklet_schedule (&dev->bh);
1053
1054 // FIXME: device recovery -- reset?
1055 }
1056 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1057
1058 /*-------------------------------------------------------------------------*/
1059
1060 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1061 struct net_device *net)
1062 {
1063 struct usbnet *dev = netdev_priv(net);
1064 int length;
1065 struct urb *urb = NULL;
1066 struct skb_data *entry;
1067 struct driver_info *info = dev->driver_info;
1068 unsigned long flags;
1069 int retval;
1070
1071 if (skb)
1072 skb_tx_timestamp(skb);
1073
1074 // some devices want funky USB-level framing, for
1075 // win32 driver (usually) and/or hardware quirks
1076 if (info->tx_fixup) {
1077 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1078 if (!skb) {
1079 if (netif_msg_tx_err(dev)) {
1080 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1081 goto drop;
1082 } else {
1083 /* cdc_ncm collected packet; waits for more */
1084 goto not_drop;
1085 }
1086 }
1087 }
1088 length = skb->len;
1089
1090 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1091 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1092 goto drop;
1093 }
1094
1095 entry = (struct skb_data *) skb->cb;
1096 entry->urb = urb;
1097 entry->dev = dev;
1098 entry->state = tx_start;
1099 entry->length = length;
1100
1101 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1102 skb->data, skb->len, tx_complete, skb);
1103
1104 /* don't assume the hardware handles USB_ZERO_PACKET
1105 * NOTE: strictly conforming cdc-ether devices should expect
1106 * the ZLP here, but ignore the one-byte packet.
1107 * NOTE2: CDC NCM specification is different from CDC ECM when
1108 * handling ZLP/short packets, so cdc_ncm driver will make short
1109 * packet itself if needed.
1110 */
1111 if (length % dev->maxpacket == 0) {
1112 if (!(info->flags & FLAG_SEND_ZLP)) {
1113 if (!(info->flags & FLAG_MULTI_PACKET)) {
1114 urb->transfer_buffer_length++;
1115 if (skb_tailroom(skb)) {
1116 skb->data[skb->len] = 0;
1117 __skb_put(skb, 1);
1118 }
1119 }
1120 } else
1121 urb->transfer_flags |= URB_ZERO_PACKET;
1122 }
1123
1124 spin_lock_irqsave(&dev->txq.lock, flags);
1125 retval = usb_autopm_get_interface_async(dev->intf);
1126 if (retval < 0) {
1127 spin_unlock_irqrestore(&dev->txq.lock, flags);
1128 goto drop;
1129 }
1130
1131 #ifdef CONFIG_PM
1132 /* if this triggers the device is still a sleep */
1133 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1134 /* transmission will be done in resume */
1135 usb_anchor_urb(urb, &dev->deferred);
1136 /* no use to process more packets */
1137 netif_stop_queue(net);
1138 spin_unlock_irqrestore(&dev->txq.lock, flags);
1139 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1140 goto deferred;
1141 }
1142 #endif
1143
1144 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1145 case -EPIPE:
1146 netif_stop_queue (net);
1147 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1148 usb_autopm_put_interface_async(dev->intf);
1149 break;
1150 default:
1151 usb_autopm_put_interface_async(dev->intf);
1152 netif_dbg(dev, tx_err, dev->net,
1153 "tx: submit urb err %d\n", retval);
1154 break;
1155 case 0:
1156 net->trans_start = jiffies;
1157 __skb_queue_tail (&dev->txq, skb);
1158 if (dev->txq.qlen >= TX_QLEN (dev))
1159 netif_stop_queue (net);
1160 }
1161 spin_unlock_irqrestore (&dev->txq.lock, flags);
1162
1163 if (retval) {
1164 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1165 drop:
1166 dev->net->stats.tx_dropped++;
1167 not_drop:
1168 if (skb)
1169 dev_kfree_skb_any (skb);
1170 usb_free_urb (urb);
1171 } else
1172 netif_dbg(dev, tx_queued, dev->net,
1173 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1174 #ifdef CONFIG_PM
1175 deferred:
1176 #endif
1177 return NETDEV_TX_OK;
1178 }
1179 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1180
1181 /*-------------------------------------------------------------------------*/
1182
1183 // tasklet (work deferred from completions, in_irq) or timer
1184
1185 static void usbnet_bh (unsigned long param)
1186 {
1187 struct usbnet *dev = (struct usbnet *) param;
1188 struct sk_buff *skb;
1189 struct skb_data *entry;
1190
1191 while ((skb = skb_dequeue (&dev->done))) {
1192 entry = (struct skb_data *) skb->cb;
1193 switch (entry->state) {
1194 case rx_done:
1195 entry->state = rx_cleanup;
1196 rx_process (dev, skb);
1197 continue;
1198 case tx_done:
1199 case rx_cleanup:
1200 usb_free_urb (entry->urb);
1201 dev_kfree_skb (skb);
1202 continue;
1203 default:
1204 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1205 }
1206 }
1207
1208 // waiting for all pending urbs to complete?
1209 if (dev->wait) {
1210 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1211 wake_up (dev->wait);
1212 }
1213
1214 // or are we maybe short a few urbs?
1215 } else if (netif_running (dev->net) &&
1216 netif_device_present (dev->net) &&
1217 !timer_pending (&dev->delay) &&
1218 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1219 int temp = dev->rxq.qlen;
1220 int qlen = RX_QLEN (dev);
1221
1222 if (temp < qlen) {
1223 struct urb *urb;
1224 int i;
1225
1226 // don't refill the queue all at once
1227 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1228 urb = usb_alloc_urb (0, GFP_ATOMIC);
1229 if (urb != NULL) {
1230 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1231 -ENOLINK)
1232 return;
1233 }
1234 }
1235 if (temp != dev->rxq.qlen)
1236 netif_dbg(dev, link, dev->net,
1237 "rxqlen %d --> %d\n",
1238 temp, dev->rxq.qlen);
1239 if (dev->rxq.qlen < qlen)
1240 tasklet_schedule (&dev->bh);
1241 }
1242 if (dev->txq.qlen < TX_QLEN (dev))
1243 netif_wake_queue (dev->net);
1244 }
1245 }
1246
1247
1248 /*-------------------------------------------------------------------------
1249 *
1250 * USB Device Driver support
1251 *
1252 *-------------------------------------------------------------------------*/
1253
1254 // precondition: never called in_interrupt
1255
1256 void usbnet_disconnect (struct usb_interface *intf)
1257 {
1258 struct usbnet *dev;
1259 struct usb_device *xdev;
1260 struct net_device *net;
1261
1262 dev = usb_get_intfdata(intf);
1263 usb_set_intfdata(intf, NULL);
1264 if (!dev)
1265 return;
1266
1267 xdev = interface_to_usbdev (intf);
1268
1269 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1270 intf->dev.driver->name,
1271 xdev->bus->bus_name, xdev->devpath,
1272 dev->driver_info->description);
1273
1274 net = dev->net;
1275 unregister_netdev (net);
1276
1277 cancel_work_sync(&dev->kevent);
1278
1279 if (dev->driver_info->unbind)
1280 dev->driver_info->unbind (dev, intf);
1281
1282 usb_kill_urb(dev->interrupt);
1283 usb_free_urb(dev->interrupt);
1284
1285 free_netdev(net);
1286 usb_put_dev (xdev);
1287 }
1288 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1289
1290 static const struct net_device_ops usbnet_netdev_ops = {
1291 .ndo_open = usbnet_open,
1292 .ndo_stop = usbnet_stop,
1293 .ndo_start_xmit = usbnet_start_xmit,
1294 .ndo_tx_timeout = usbnet_tx_timeout,
1295 .ndo_change_mtu = usbnet_change_mtu,
1296 .ndo_set_mac_address = eth_mac_addr,
1297 .ndo_validate_addr = eth_validate_addr,
1298 };
1299
1300 /*-------------------------------------------------------------------------*/
1301
1302 // precondition: never called in_interrupt
1303
1304 static struct device_type wlan_type = {
1305 .name = "wlan",
1306 };
1307
1308 static struct device_type wwan_type = {
1309 .name = "wwan",
1310 };
1311
1312 int
1313 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1314 {
1315 struct usbnet *dev;
1316 struct net_device *net;
1317 struct usb_host_interface *interface;
1318 struct driver_info *info;
1319 struct usb_device *xdev;
1320 int status;
1321 const char *name;
1322 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1323
1324 /* usbnet already took usb runtime pm, so have to enable the feature
1325 * for usb interface, otherwise usb_autopm_get_interface may return
1326 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1327 */
1328 if (!driver->supports_autosuspend) {
1329 driver->supports_autosuspend = 1;
1330 pm_runtime_enable(&udev->dev);
1331 }
1332
1333 name = udev->dev.driver->name;
1334 info = (struct driver_info *) prod->driver_info;
1335 if (!info) {
1336 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1337 return -ENODEV;
1338 }
1339 xdev = interface_to_usbdev (udev);
1340 interface = udev->cur_altsetting;
1341
1342 usb_get_dev (xdev);
1343
1344 status = -ENOMEM;
1345
1346 // set up our own records
1347 net = alloc_etherdev(sizeof(*dev));
1348 if (!net)
1349 goto out;
1350
1351 /* netdev_printk() needs this so do it as early as possible */
1352 SET_NETDEV_DEV(net, &udev->dev);
1353
1354 dev = netdev_priv(net);
1355 dev->udev = xdev;
1356 dev->intf = udev;
1357 dev->driver_info = info;
1358 dev->driver_name = name;
1359 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1360 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1361 skb_queue_head_init (&dev->rxq);
1362 skb_queue_head_init (&dev->txq);
1363 skb_queue_head_init (&dev->done);
1364 skb_queue_head_init(&dev->rxq_pause);
1365 dev->bh.func = usbnet_bh;
1366 dev->bh.data = (unsigned long) dev;
1367 INIT_WORK (&dev->kevent, kevent);
1368 init_usb_anchor(&dev->deferred);
1369 dev->delay.function = usbnet_bh;
1370 dev->delay.data = (unsigned long) dev;
1371 init_timer (&dev->delay);
1372 mutex_init (&dev->phy_mutex);
1373
1374 dev->net = net;
1375 strcpy (net->name, "usb%d");
1376 memcpy (net->dev_addr, node_id, sizeof node_id);
1377
1378 /* rx and tx sides can use different message sizes;
1379 * bind() should set rx_urb_size in that case.
1380 */
1381 dev->hard_mtu = net->mtu + net->hard_header_len;
1382 #if 0
1383 // dma_supported() is deeply broken on almost all architectures
1384 // possible with some EHCI controllers
1385 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1386 net->features |= NETIF_F_HIGHDMA;
1387 #endif
1388
1389 net->netdev_ops = &usbnet_netdev_ops;
1390 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1391 net->ethtool_ops = &usbnet_ethtool_ops;
1392
1393 // allow device-specific bind/init procedures
1394 // NOTE net->name still not usable ...
1395 if (info->bind) {
1396 status = info->bind (dev, udev);
1397 if (status < 0)
1398 goto out1;
1399
1400 // heuristic: "usb%d" for links we know are two-host,
1401 // else "eth%d" when there's reasonable doubt. userspace
1402 // can rename the link if it knows better.
1403 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1404 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1405 (net->dev_addr [0] & 0x02) == 0))
1406 strcpy (net->name, "eth%d");
1407 /* WLAN devices should always be named "wlan%d" */
1408 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1409 strcpy(net->name, "wlan%d");
1410 /* WWAN devices should always be named "wwan%d" */
1411 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1412 strcpy(net->name, "wwan%d");
1413
1414 /* maybe the remote can't receive an Ethernet MTU */
1415 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1416 net->mtu = dev->hard_mtu - net->hard_header_len;
1417 } else if (!info->in || !info->out)
1418 status = usbnet_get_endpoints (dev, udev);
1419 else {
1420 dev->in = usb_rcvbulkpipe (xdev, info->in);
1421 dev->out = usb_sndbulkpipe (xdev, info->out);
1422 if (!(info->flags & FLAG_NO_SETINT))
1423 status = usb_set_interface (xdev,
1424 interface->desc.bInterfaceNumber,
1425 interface->desc.bAlternateSetting);
1426 else
1427 status = 0;
1428
1429 }
1430 if (status >= 0 && dev->status)
1431 status = init_status (dev, udev);
1432 if (status < 0)
1433 goto out3;
1434
1435 if (!dev->rx_urb_size)
1436 dev->rx_urb_size = dev->hard_mtu;
1437 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1438
1439 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1440 SET_NETDEV_DEVTYPE(net, &wlan_type);
1441 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1442 SET_NETDEV_DEVTYPE(net, &wwan_type);
1443
1444 status = register_netdev (net);
1445 if (status)
1446 goto out3;
1447 netif_info(dev, probe, dev->net,
1448 "register '%s' at usb-%s-%s, %s, %pM\n",
1449 udev->dev.driver->name,
1450 xdev->bus->bus_name, xdev->devpath,
1451 dev->driver_info->description,
1452 net->dev_addr);
1453
1454 // ok, it's ready to go.
1455 usb_set_intfdata (udev, dev);
1456
1457 netif_device_attach (net);
1458
1459 if (dev->driver_info->flags & FLAG_LINK_INTR)
1460 netif_carrier_off(net);
1461
1462 return 0;
1463
1464 out3:
1465 if (info->unbind)
1466 info->unbind (dev, udev);
1467 out1:
1468 free_netdev(net);
1469 out:
1470 usb_put_dev(xdev);
1471 return status;
1472 }
1473 EXPORT_SYMBOL_GPL(usbnet_probe);
1474
1475 /*-------------------------------------------------------------------------*/
1476
1477 /*
1478 * suspend the whole driver as soon as the first interface is suspended
1479 * resume only when the last interface is resumed
1480 */
1481
1482 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1483 {
1484 struct usbnet *dev = usb_get_intfdata(intf);
1485
1486 if (!dev->suspend_count++) {
1487 spin_lock_irq(&dev->txq.lock);
1488 /* don't autosuspend while transmitting */
1489 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1490 spin_unlock_irq(&dev->txq.lock);
1491 return -EBUSY;
1492 } else {
1493 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1494 spin_unlock_irq(&dev->txq.lock);
1495 }
1496 /*
1497 * accelerate emptying of the rx and queues, to avoid
1498 * having everything error out.
1499 */
1500 netif_device_detach (dev->net);
1501 usbnet_terminate_urbs(dev);
1502 usb_kill_urb(dev->interrupt);
1503
1504 /*
1505 * reattach so runtime management can use and
1506 * wake the device
1507 */
1508 netif_device_attach (dev->net);
1509 }
1510 return 0;
1511 }
1512 EXPORT_SYMBOL_GPL(usbnet_suspend);
1513
1514 int usbnet_resume (struct usb_interface *intf)
1515 {
1516 struct usbnet *dev = usb_get_intfdata(intf);
1517 struct sk_buff *skb;
1518 struct urb *res;
1519 int retval;
1520
1521 if (!--dev->suspend_count) {
1522 /* resume interrupt URBs */
1523 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1524 usb_submit_urb(dev->interrupt, GFP_NOIO);
1525
1526 spin_lock_irq(&dev->txq.lock);
1527 while ((res = usb_get_from_anchor(&dev->deferred))) {
1528
1529 skb = (struct sk_buff *)res->context;
1530 retval = usb_submit_urb(res, GFP_ATOMIC);
1531 if (retval < 0) {
1532 dev_kfree_skb_any(skb);
1533 usb_free_urb(res);
1534 usb_autopm_put_interface_async(dev->intf);
1535 } else {
1536 dev->net->trans_start = jiffies;
1537 __skb_queue_tail(&dev->txq, skb);
1538 }
1539 }
1540
1541 smp_mb();
1542 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1543 spin_unlock_irq(&dev->txq.lock);
1544
1545 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1546 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1547 netif_tx_wake_all_queues(dev->net);
1548 tasklet_schedule (&dev->bh);
1549 }
1550 }
1551 return 0;
1552 }
1553 EXPORT_SYMBOL_GPL(usbnet_resume);
1554
1555
1556 /*-------------------------------------------------------------------------*/
1557
1558 static int __init usbnet_init(void)
1559 {
1560 /* Compiler should optimize this out. */
1561 BUILD_BUG_ON(
1562 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1563
1564 random_ether_addr(node_id);
1565 return 0;
1566 }
1567 module_init(usbnet_init);
1568
1569 static void __exit usbnet_exit(void)
1570 {
1571 }
1572 module_exit(usbnet_exit);
1573
1574 MODULE_AUTHOR("David Brownell");
1575 MODULE_DESCRIPTION("USB network driver framework");
1576 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)