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block: mtip32xx: remove HOTPLUG_PCI_PCIE dependancy
[zen-stable.git] / drivers / net / usb / usbnet.c
blob96110499c0554ba11af3ad830de244d0e1dc245e
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 return;
497 }
498 usb_free_urb (urb);
499 }
500 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
501 }
502
503 static void intr_complete (struct urb *urb)
504 {
505 struct usbnet *dev = urb->context;
506 int status = urb->status;
507
508 switch (status) {
509 /* success */
510 case 0:
511 dev->driver_info->status(dev, urb);
512 break;
513
514 /* software-driven interface shutdown */
515 case -ENOENT: /* urb killed */
516 case -ESHUTDOWN: /* hardware gone */
517 netif_dbg(dev, ifdown, dev->net,
518 "intr shutdown, code %d\n", status);
519 return;
520
521 /* NOTE: not throttling like RX/TX, since this endpoint
522 * already polls infrequently
523 */
524 default:
525 netdev_dbg(dev->net, "intr status %d\n", status);
526 break;
527 }
528
529 if (!netif_running (dev->net))
530 return;
531
532 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
533 status = usb_submit_urb (urb, GFP_ATOMIC);
534 if (status != 0)
535 netif_err(dev, timer, dev->net,
536 "intr resubmit --> %d\n", status);
537 }
538
539 /*-------------------------------------------------------------------------*/
540 void usbnet_pause_rx(struct usbnet *dev)
541 {
542 set_bit(EVENT_RX_PAUSED, &dev->flags);
543
544 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
545 }
546 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
547
548 void usbnet_resume_rx(struct usbnet *dev)
549 {
550 struct sk_buff *skb;
551 int num = 0;
552
553 clear_bit(EVENT_RX_PAUSED, &dev->flags);
554
555 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
556 usbnet_skb_return(dev, skb);
557 num++;
558 }
559
560 tasklet_schedule(&dev->bh);
561
562 netif_dbg(dev, rx_status, dev->net,
563 "paused rx queue disabled, %d skbs requeued\n", num);
564 }
565 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
566
567 void usbnet_purge_paused_rxq(struct usbnet *dev)
568 {
569 skb_queue_purge(&dev->rxq_pause);
570 }
571 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
572
573 /*-------------------------------------------------------------------------*/
574
575 // unlink pending rx/tx; completion handlers do all other cleanup
576
577 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
578 {
579 unsigned long flags;
580 struct sk_buff *skb, *skbnext;
581 int count = 0;
582
583 spin_lock_irqsave (&q->lock, flags);
584 skb_queue_walk_safe(q, skb, skbnext) {
585 struct skb_data *entry;
586 struct urb *urb;
587 int retval;
588
589 entry = (struct skb_data *) skb->cb;
590 urb = entry->urb;
591
592 /*
593 * Get reference count of the URB to avoid it to be
594 * freed during usb_unlink_urb, which may trigger
595 * use-after-free problem inside usb_unlink_urb since
596 * usb_unlink_urb is always racing with .complete
597 * handler(include defer_bh).
598 */
599 usb_get_urb(urb);
600 spin_unlock_irqrestore(&q->lock, flags);
601 // during some PM-driven resume scenarios,
602 // these (async) unlinks complete immediately
603 retval = usb_unlink_urb (urb);
604 if (retval != -EINPROGRESS && retval != 0)
605 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
606 else
607 count++;
608 usb_put_urb(urb);
609 spin_lock_irqsave(&q->lock, flags);
610 }
611 spin_unlock_irqrestore (&q->lock, flags);
612 return count;
613 }
614
615 // Flush all pending rx urbs
616 // minidrivers may need to do this when the MTU changes
617
618 void usbnet_unlink_rx_urbs(struct usbnet *dev)
619 {
620 if (netif_running(dev->net)) {
621 (void) unlink_urbs (dev, &dev->rxq);
622 tasklet_schedule(&dev->bh);
623 }
624 }
625 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
626
627 /*-------------------------------------------------------------------------*/
628
629 // precondition: never called in_interrupt
630 static void usbnet_terminate_urbs(struct usbnet *dev)
631 {
632 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
633 DECLARE_WAITQUEUE(wait, current);
634 int temp;
635
636 /* ensure there are no more active urbs */
637 add_wait_queue(&unlink_wakeup, &wait);
638 set_current_state(TASK_UNINTERRUPTIBLE);
639 dev->wait = &unlink_wakeup;
640 temp = unlink_urbs(dev, &dev->txq) +
641 unlink_urbs(dev, &dev->rxq);
642
643 /* maybe wait for deletions to finish. */
644 while (!skb_queue_empty(&dev->rxq)
645 && !skb_queue_empty(&dev->txq)
646 && !skb_queue_empty(&dev->done)) {
647 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
648 set_current_state(TASK_UNINTERRUPTIBLE);
649 netif_dbg(dev, ifdown, dev->net,
650 "waited for %d urb completions\n", temp);
651 }
652 set_current_state(TASK_RUNNING);
653 dev->wait = NULL;
654 remove_wait_queue(&unlink_wakeup, &wait);
655 }
656
657 int usbnet_stop (struct net_device *net)
658 {
659 struct usbnet *dev = netdev_priv(net);
660 struct driver_info *info = dev->driver_info;
661 int retval;
662
663 clear_bit(EVENT_DEV_OPEN, &dev->flags);
664 netif_stop_queue (net);
665
666 netif_info(dev, ifdown, dev->net,
667 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
668 net->stats.rx_packets, net->stats.tx_packets,
669 net->stats.rx_errors, net->stats.tx_errors);
670
671 /* allow minidriver to stop correctly (wireless devices to turn off
672 * radio etc) */
673 if (info->stop) {
674 retval = info->stop(dev);
675 if (retval < 0)
676 netif_info(dev, ifdown, dev->net,
677 "stop fail (%d) usbnet usb-%s-%s, %s\n",
678 retval,
679 dev->udev->bus->bus_name, dev->udev->devpath,
680 info->description);
681 }
682
683 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
684 usbnet_terminate_urbs(dev);
685
686 usb_kill_urb(dev->interrupt);
687
688 usbnet_purge_paused_rxq(dev);
689
690 /* deferred work (task, timer, softirq) must also stop.
691 * can't flush_scheduled_work() until we drop rtnl (later),
692 * else workers could deadlock; so make workers a NOP.
693 */
694 dev->flags = 0;
695 del_timer_sync (&dev->delay);
696 tasklet_kill (&dev->bh);
697 if (info->manage_power)
698 info->manage_power(dev, 0);
699 else
700 usb_autopm_put_interface(dev->intf);
701
702 return 0;
703 }
704 EXPORT_SYMBOL_GPL(usbnet_stop);
705
706 /*-------------------------------------------------------------------------*/
707
708 // posts reads, and enables write queuing
709
710 // precondition: never called in_interrupt
711
712 int usbnet_open (struct net_device *net)
713 {
714 struct usbnet *dev = netdev_priv(net);
715 int retval;
716 struct driver_info *info = dev->driver_info;
717
718 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
719 netif_info(dev, ifup, dev->net,
720 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
721 retval,
722 dev->udev->bus->bus_name,
723 dev->udev->devpath,
724 info->description);
725 goto done_nopm;
726 }
727
728 // put into "known safe" state
729 if (info->reset && (retval = info->reset (dev)) < 0) {
730 netif_info(dev, ifup, dev->net,
731 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
732 retval,
733 dev->udev->bus->bus_name,
734 dev->udev->devpath,
735 info->description);
736 goto done;
737 }
738
739 // insist peer be connected
740 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
741 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
742 goto done;
743 }
744
745 /* start any status interrupt transfer */
746 if (dev->interrupt) {
747 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
748 if (retval < 0) {
749 netif_err(dev, ifup, dev->net,
750 "intr submit %d\n", retval);
751 goto done;
752 }
753 }
754
755 set_bit(EVENT_DEV_OPEN, &dev->flags);
756 netif_start_queue (net);
757 netif_info(dev, ifup, dev->net,
758 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
759 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
760 dev->net->mtu,
761 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
762 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
763 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
764 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
765 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
766 "simple");
767
768 // delay posting reads until we're fully open
769 tasklet_schedule (&dev->bh);
770 if (info->manage_power) {
771 retval = info->manage_power(dev, 1);
772 if (retval < 0)
773 goto done;
774 usb_autopm_put_interface(dev->intf);
775 }
776 return retval;
777
778 done:
779 usb_autopm_put_interface(dev->intf);
780 done_nopm:
781 return retval;
782 }
783 EXPORT_SYMBOL_GPL(usbnet_open);
784
785 /*-------------------------------------------------------------------------*/
786
787 /* ethtool methods; minidrivers may need to add some more, but
788 * they'll probably want to use this base set.
789 */
790
791 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
792 {
793 struct usbnet *dev = netdev_priv(net);
794
795 if (!dev->mii.mdio_read)
796 return -EOPNOTSUPP;
797
798 return mii_ethtool_gset(&dev->mii, cmd);
799 }
800 EXPORT_SYMBOL_GPL(usbnet_get_settings);
801
802 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
803 {
804 struct usbnet *dev = netdev_priv(net);
805 int retval;
806
807 if (!dev->mii.mdio_write)
808 return -EOPNOTSUPP;
809
810 retval = mii_ethtool_sset(&dev->mii, cmd);
811
812 /* link speed/duplex might have changed */
813 if (dev->driver_info->link_reset)
814 dev->driver_info->link_reset(dev);
815
816 return retval;
817
818 }
819 EXPORT_SYMBOL_GPL(usbnet_set_settings);
820
821 u32 usbnet_get_link (struct net_device *net)
822 {
823 struct usbnet *dev = netdev_priv(net);
824
825 /* If a check_connect is defined, return its result */
826 if (dev->driver_info->check_connect)
827 return dev->driver_info->check_connect (dev) == 0;
828
829 /* if the device has mii operations, use those */
830 if (dev->mii.mdio_read)
831 return mii_link_ok(&dev->mii);
832
833 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
834 return ethtool_op_get_link(net);
835 }
836 EXPORT_SYMBOL_GPL(usbnet_get_link);
837
838 int usbnet_nway_reset(struct net_device *net)
839 {
840 struct usbnet *dev = netdev_priv(net);
841
842 if (!dev->mii.mdio_write)
843 return -EOPNOTSUPP;
844
845 return mii_nway_restart(&dev->mii);
846 }
847 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
848
849 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
850 {
851 struct usbnet *dev = netdev_priv(net);
852
853 strncpy (info->driver, dev->driver_name, sizeof info->driver);
854 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
855 strncpy (info->fw_version, dev->driver_info->description,
856 sizeof info->fw_version);
857 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
858 }
859 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
860
861 u32 usbnet_get_msglevel (struct net_device *net)
862 {
863 struct usbnet *dev = netdev_priv(net);
864
865 return dev->msg_enable;
866 }
867 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
868
869 void usbnet_set_msglevel (struct net_device *net, u32 level)
870 {
871 struct usbnet *dev = netdev_priv(net);
872
873 dev->msg_enable = level;
874 }
875 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
876
877 /* drivers may override default ethtool_ops in their bind() routine */
878 static const struct ethtool_ops usbnet_ethtool_ops = {
879 .get_settings = usbnet_get_settings,
880 .set_settings = usbnet_set_settings,
881 .get_link = usbnet_get_link,
882 .nway_reset = usbnet_nway_reset,
883 .get_drvinfo = usbnet_get_drvinfo,
884 .get_msglevel = usbnet_get_msglevel,
885 .set_msglevel = usbnet_set_msglevel,
886 };
887
888 /*-------------------------------------------------------------------------*/
889
890 /* work that cannot be done in interrupt context uses keventd.
891 *
892 * NOTE: with 2.5 we could do more of this using completion callbacks,
893 * especially now that control transfers can be queued.
894 */
895 static void
896 kevent (struct work_struct *work)
897 {
898 struct usbnet *dev =
899 container_of(work, struct usbnet, kevent);
900 int status;
901
902 /* usb_clear_halt() needs a thread context */
903 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
904 unlink_urbs (dev, &dev->txq);
905 status = usb_autopm_get_interface(dev->intf);
906 if (status < 0)
907 goto fail_pipe;
908 status = usb_clear_halt (dev->udev, dev->out);
909 usb_autopm_put_interface(dev->intf);
910 if (status < 0 &&
911 status != -EPIPE &&
912 status != -ESHUTDOWN) {
913 if (netif_msg_tx_err (dev))
914 fail_pipe:
915 netdev_err(dev->net, "can't clear tx halt, status %d\n",
916 status);
917 } else {
918 clear_bit (EVENT_TX_HALT, &dev->flags);
919 if (status != -ESHUTDOWN)
920 netif_wake_queue (dev->net);
921 }
922 }
923 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
924 unlink_urbs (dev, &dev->rxq);
925 status = usb_autopm_get_interface(dev->intf);
926 if (status < 0)
927 goto fail_halt;
928 status = usb_clear_halt (dev->udev, dev->in);
929 usb_autopm_put_interface(dev->intf);
930 if (status < 0 &&
931 status != -EPIPE &&
932 status != -ESHUTDOWN) {
933 if (netif_msg_rx_err (dev))
934 fail_halt:
935 netdev_err(dev->net, "can't clear rx halt, status %d\n",
936 status);
937 } else {
938 clear_bit (EVENT_RX_HALT, &dev->flags);
939 tasklet_schedule (&dev->bh);
940 }
941 }
942
943 /* tasklet could resubmit itself forever if memory is tight */
944 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
945 struct urb *urb = NULL;
946 int resched = 1;
947
948 if (netif_running (dev->net))
949 urb = usb_alloc_urb (0, GFP_KERNEL);
950 else
951 clear_bit (EVENT_RX_MEMORY, &dev->flags);
952 if (urb != NULL) {
953 clear_bit (EVENT_RX_MEMORY, &dev->flags);
954 status = usb_autopm_get_interface(dev->intf);
955 if (status < 0) {
956 usb_free_urb(urb);
957 goto fail_lowmem;
958 }
959 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
960 resched = 0;
961 usb_autopm_put_interface(dev->intf);
962 fail_lowmem:
963 if (resched)
964 tasklet_schedule (&dev->bh);
965 }
966 }
967
968 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
969 struct driver_info *info = dev->driver_info;
970 int retval = 0;
971
972 clear_bit (EVENT_LINK_RESET, &dev->flags);
973 status = usb_autopm_get_interface(dev->intf);
974 if (status < 0)
975 goto skip_reset;
976 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
977 usb_autopm_put_interface(dev->intf);
978 skip_reset:
979 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
980 retval,
981 dev->udev->bus->bus_name,
982 dev->udev->devpath,
983 info->description);
984 } else {
985 usb_autopm_put_interface(dev->intf);
986 }
987 }
988
989 if (dev->flags)
990 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
991 }
992
993 /*-------------------------------------------------------------------------*/
994
995 static void tx_complete (struct urb *urb)
996 {
997 struct sk_buff *skb = (struct sk_buff *) urb->context;
998 struct skb_data *entry = (struct skb_data *) skb->cb;
999 struct usbnet *dev = entry->dev;
1000
1001 if (urb->status == 0) {
1002 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1003 dev->net->stats.tx_packets++;
1004 dev->net->stats.tx_bytes += entry->length;
1005 } else {
1006 dev->net->stats.tx_errors++;
1007
1008 switch (urb->status) {
1009 case -EPIPE:
1010 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1011 break;
1012
1013 /* software-driven interface shutdown */
1014 case -ECONNRESET: // async unlink
1015 case -ESHUTDOWN: // hardware gone
1016 break;
1017
1018 // like rx, tx gets controller i/o faults during khubd delays
1019 // and so it uses the same throttling mechanism.
1020 case -EPROTO:
1021 case -ETIME:
1022 case -EILSEQ:
1023 usb_mark_last_busy(dev->udev);
1024 if (!timer_pending (&dev->delay)) {
1025 mod_timer (&dev->delay,
1026 jiffies + THROTTLE_JIFFIES);
1027 netif_dbg(dev, link, dev->net,
1028 "tx throttle %d\n", urb->status);
1029 }
1030 netif_stop_queue (dev->net);
1031 break;
1032 default:
1033 netif_dbg(dev, tx_err, dev->net,
1034 "tx err %d\n", entry->urb->status);
1035 break;
1036 }
1037 }
1038
1039 usb_autopm_put_interface_async(dev->intf);
1040 entry->state = tx_done;
1041 defer_bh(dev, skb, &dev->txq);
1042 }
1043
1044 /*-------------------------------------------------------------------------*/
1045
1046 void usbnet_tx_timeout (struct net_device *net)
1047 {
1048 struct usbnet *dev = netdev_priv(net);
1049
1050 unlink_urbs (dev, &dev->txq);
1051 tasklet_schedule (&dev->bh);
1052
1053 // FIXME: device recovery -- reset?
1054 }
1055 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1056
1057 /*-------------------------------------------------------------------------*/
1058
1059 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1060 struct net_device *net)
1061 {
1062 struct usbnet *dev = netdev_priv(net);
1063 int length;
1064 struct urb *urb = NULL;
1065 struct skb_data *entry;
1066 struct driver_info *info = dev->driver_info;
1067 unsigned long flags;
1068 int retval;
1069
1070 if (skb)
1071 skb_tx_timestamp(skb);
1072
1073 // some devices want funky USB-level framing, for
1074 // win32 driver (usually) and/or hardware quirks
1075 if (info->tx_fixup) {
1076 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1077 if (!skb) {
1078 if (netif_msg_tx_err(dev)) {
1079 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1080 goto drop;
1081 } else {
1082 /* cdc_ncm collected packet; waits for more */
1083 goto not_drop;
1084 }
1085 }
1086 }
1087 length = skb->len;
1088
1089 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1090 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1091 goto drop;
1092 }
1093
1094 entry = (struct skb_data *) skb->cb;
1095 entry->urb = urb;
1096 entry->dev = dev;
1097 entry->state = tx_start;
1098 entry->length = length;
1099
1100 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1101 skb->data, skb->len, tx_complete, skb);
1102
1103 /* don't assume the hardware handles USB_ZERO_PACKET
1104 * NOTE: strictly conforming cdc-ether devices should expect
1105 * the ZLP here, but ignore the one-byte packet.
1106 * NOTE2: CDC NCM specification is different from CDC ECM when
1107 * handling ZLP/short packets, so cdc_ncm driver will make short
1108 * packet itself if needed.
1109 */
1110 if (length % dev->maxpacket == 0) {
1111 if (!(info->flags & FLAG_SEND_ZLP)) {
1112 if (!(info->flags & FLAG_MULTI_PACKET)) {
1113 urb->transfer_buffer_length++;
1114 if (skb_tailroom(skb)) {
1115 skb->data[skb->len] = 0;
1116 __skb_put(skb, 1);
1117 }
1118 }
1119 } else
1120 urb->transfer_flags |= URB_ZERO_PACKET;
1121 }
1122
1123 spin_lock_irqsave(&dev->txq.lock, flags);
1124 retval = usb_autopm_get_interface_async(dev->intf);
1125 if (retval < 0) {
1126 spin_unlock_irqrestore(&dev->txq.lock, flags);
1127 goto drop;
1128 }
1129
1130 #ifdef CONFIG_PM
1131 /* if this triggers the device is still a sleep */
1132 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1133 /* transmission will be done in resume */
1134 usb_anchor_urb(urb, &dev->deferred);
1135 /* no use to process more packets */
1136 netif_stop_queue(net);
1137 spin_unlock_irqrestore(&dev->txq.lock, flags);
1138 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1139 goto deferred;
1140 }
1141 #endif
1142
1143 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1144 case -EPIPE:
1145 netif_stop_queue (net);
1146 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1147 usb_autopm_put_interface_async(dev->intf);
1148 break;
1149 default:
1150 usb_autopm_put_interface_async(dev->intf);
1151 netif_dbg(dev, tx_err, dev->net,
1152 "tx: submit urb err %d\n", retval);
1153 break;
1154 case 0:
1155 net->trans_start = jiffies;
1156 __skb_queue_tail (&dev->txq, skb);
1157 if (dev->txq.qlen >= TX_QLEN (dev))
1158 netif_stop_queue (net);
1159 }
1160 spin_unlock_irqrestore (&dev->txq.lock, flags);
1161
1162 if (retval) {
1163 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1164 drop:
1165 dev->net->stats.tx_dropped++;
1166 not_drop:
1167 if (skb)
1168 dev_kfree_skb_any (skb);
1169 usb_free_urb (urb);
1170 } else
1171 netif_dbg(dev, tx_queued, dev->net,
1172 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1173 #ifdef CONFIG_PM
1174 deferred:
1175 #endif
1176 return NETDEV_TX_OK;
1177 }
1178 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1179
1180 /*-------------------------------------------------------------------------*/
1181
1182 // tasklet (work deferred from completions, in_irq) or timer
1183
1184 static void usbnet_bh (unsigned long param)
1185 {
1186 struct usbnet *dev = (struct usbnet *) param;
1187 struct sk_buff *skb;
1188 struct skb_data *entry;
1189
1190 while ((skb = skb_dequeue (&dev->done))) {
1191 entry = (struct skb_data *) skb->cb;
1192 switch (entry->state) {
1193 case rx_done:
1194 entry->state = rx_cleanup;
1195 rx_process (dev, skb);
1196 continue;
1197 case tx_done:
1198 case rx_cleanup:
1199 usb_free_urb (entry->urb);
1200 dev_kfree_skb (skb);
1201 continue;
1202 default:
1203 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1204 }
1205 }
1206
1207 // waiting for all pending urbs to complete?
1208 if (dev->wait) {
1209 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1210 wake_up (dev->wait);
1211 }
1212
1213 // or are we maybe short a few urbs?
1214 } else if (netif_running (dev->net) &&
1215 netif_device_present (dev->net) &&
1216 !timer_pending (&dev->delay) &&
1217 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1218 int temp = dev->rxq.qlen;
1219 int qlen = RX_QLEN (dev);
1220
1221 if (temp < qlen) {
1222 struct urb *urb;
1223 int i;
1224
1225 // don't refill the queue all at once
1226 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1227 urb = usb_alloc_urb (0, GFP_ATOMIC);
1228 if (urb != NULL) {
1229 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1230 -ENOLINK)
1231 return;
1232 }
1233 }
1234 if (temp != dev->rxq.qlen)
1235 netif_dbg(dev, link, dev->net,
1236 "rxqlen %d --> %d\n",
1237 temp, dev->rxq.qlen);
1238 if (dev->rxq.qlen < qlen)
1239 tasklet_schedule (&dev->bh);
1240 }
1241 if (dev->txq.qlen < TX_QLEN (dev))
1242 netif_wake_queue (dev->net);
1243 }
1244 }
1245
1246
1247 /*-------------------------------------------------------------------------
1248 *
1249 * USB Device Driver support
1250 *
1251 *-------------------------------------------------------------------------*/
1252
1253 // precondition: never called in_interrupt
1254
1255 void usbnet_disconnect (struct usb_interface *intf)
1256 {
1257 struct usbnet *dev;
1258 struct usb_device *xdev;
1259 struct net_device *net;
1260
1261 dev = usb_get_intfdata(intf);
1262 usb_set_intfdata(intf, NULL);
1263 if (!dev)
1264 return;
1265
1266 xdev = interface_to_usbdev (intf);
1267
1268 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1269 intf->dev.driver->name,
1270 xdev->bus->bus_name, xdev->devpath,
1271 dev->driver_info->description);
1272
1273 net = dev->net;
1274 unregister_netdev (net);
1275
1276 cancel_work_sync(&dev->kevent);
1277
1278 if (dev->driver_info->unbind)
1279 dev->driver_info->unbind (dev, intf);
1280
1281 usb_kill_urb(dev->interrupt);
1282 usb_free_urb(dev->interrupt);
1283
1284 free_netdev(net);
1285 usb_put_dev (xdev);
1286 }
1287 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1288
1289 static const struct net_device_ops usbnet_netdev_ops = {
1290 .ndo_open = usbnet_open,
1291 .ndo_stop = usbnet_stop,
1292 .ndo_start_xmit = usbnet_start_xmit,
1293 .ndo_tx_timeout = usbnet_tx_timeout,
1294 .ndo_change_mtu = usbnet_change_mtu,
1295 .ndo_set_mac_address = eth_mac_addr,
1296 .ndo_validate_addr = eth_validate_addr,
1297 };
1298
1299 /*-------------------------------------------------------------------------*/
1300
1301 // precondition: never called in_interrupt
1302
1303 static struct device_type wlan_type = {
1304 .name = "wlan",
1305 };
1306
1307 static struct device_type wwan_type = {
1308 .name = "wwan",
1309 };
1310
1311 int
1312 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1313 {
1314 struct usbnet *dev;
1315 struct net_device *net;
1316 struct usb_host_interface *interface;
1317 struct driver_info *info;
1318 struct usb_device *xdev;
1319 int status;
1320 const char *name;
1321 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1322
1323 /* usbnet already took usb runtime pm, so have to enable the feature
1324 * for usb interface, otherwise usb_autopm_get_interface may return
1325 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1326 */
1327 if (!driver->supports_autosuspend) {
1328 driver->supports_autosuspend = 1;
1329 pm_runtime_enable(&udev->dev);
1330 }
1331
1332 name = udev->dev.driver->name;
1333 info = (struct driver_info *) prod->driver_info;
1334 if (!info) {
1335 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1336 return -ENODEV;
1337 }
1338 xdev = interface_to_usbdev (udev);
1339 interface = udev->cur_altsetting;
1340
1341 usb_get_dev (xdev);
1342
1343 status = -ENOMEM;
1344
1345 // set up our own records
1346 net = alloc_etherdev(sizeof(*dev));
1347 if (!net) {
1348 dbg ("can't kmalloc dev");
1349 goto out;
1350 }
1351
1352 /* netdev_printk() needs this so do it as early as possible */
1353 SET_NETDEV_DEV(net, &udev->dev);
1354
1355 dev = netdev_priv(net);
1356 dev->udev = xdev;
1357 dev->intf = udev;
1358 dev->driver_info = info;
1359 dev->driver_name = name;
1360 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1361 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1362 skb_queue_head_init (&dev->rxq);
1363 skb_queue_head_init (&dev->txq);
1364 skb_queue_head_init (&dev->done);
1365 skb_queue_head_init(&dev->rxq_pause);
1366 dev->bh.func = usbnet_bh;
1367 dev->bh.data = (unsigned long) dev;
1368 INIT_WORK (&dev->kevent, kevent);
1369 init_usb_anchor(&dev->deferred);
1370 dev->delay.function = usbnet_bh;
1371 dev->delay.data = (unsigned long) dev;
1372 init_timer (&dev->delay);
1373 mutex_init (&dev->phy_mutex);
1374
1375 dev->net = net;
1376 strcpy (net->name, "usb%d");
1377 memcpy (net->dev_addr, node_id, sizeof node_id);
1378
1379 /* rx and tx sides can use different message sizes;
1380 * bind() should set rx_urb_size in that case.
1381 */
1382 dev->hard_mtu = net->mtu + net->hard_header_len;
1383 #if 0
1384 // dma_supported() is deeply broken on almost all architectures
1385 // possible with some EHCI controllers
1386 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1387 net->features |= NETIF_F_HIGHDMA;
1388 #endif
1389
1390 net->netdev_ops = &usbnet_netdev_ops;
1391 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1392 net->ethtool_ops = &usbnet_ethtool_ops;
1393
1394 // allow device-specific bind/init procedures
1395 // NOTE net->name still not usable ...
1396 if (info->bind) {
1397 status = info->bind (dev, udev);
1398 if (status < 0)
1399 goto out1;
1400
1401 // heuristic: "usb%d" for links we know are two-host,
1402 // else "eth%d" when there's reasonable doubt. userspace
1403 // can rename the link if it knows better.
1404 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1405 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1406 (net->dev_addr [0] & 0x02) == 0))
1407 strcpy (net->name, "eth%d");
1408 /* WLAN devices should always be named "wlan%d" */
1409 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1410 strcpy(net->name, "wlan%d");
1411 /* WWAN devices should always be named "wwan%d" */
1412 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1413 strcpy(net->name, "wwan%d");
1414
1415 /* maybe the remote can't receive an Ethernet MTU */
1416 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1417 net->mtu = dev->hard_mtu - net->hard_header_len;
1418 } else if (!info->in || !info->out)
1419 status = usbnet_get_endpoints (dev, udev);
1420 else {
1421 dev->in = usb_rcvbulkpipe (xdev, info->in);
1422 dev->out = usb_sndbulkpipe (xdev, info->out);
1423 if (!(info->flags & FLAG_NO_SETINT))
1424 status = usb_set_interface (xdev,
1425 interface->desc.bInterfaceNumber,
1426 interface->desc.bAlternateSetting);
1427 else
1428 status = 0;
1429
1430 }
1431 if (status >= 0 && dev->status)
1432 status = init_status (dev, udev);
1433 if (status < 0)
1434 goto out3;
1435
1436 if (!dev->rx_urb_size)
1437 dev->rx_urb_size = dev->hard_mtu;
1438 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1439
1440 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1441 SET_NETDEV_DEVTYPE(net, &wlan_type);
1442 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1443 SET_NETDEV_DEVTYPE(net, &wwan_type);
1444
1445 status = register_netdev (net);
1446 if (status)
1447 goto out3;
1448 netif_info(dev, probe, dev->net,
1449 "register '%s' at usb-%s-%s, %s, %pM\n",
1450 udev->dev.driver->name,
1451 xdev->bus->bus_name, xdev->devpath,
1452 dev->driver_info->description,
1453 net->dev_addr);
1454
1455 // ok, it's ready to go.
1456 usb_set_intfdata (udev, dev);
1457
1458 netif_device_attach (net);
1459
1460 if (dev->driver_info->flags & FLAG_LINK_INTR)
1461 netif_carrier_off(net);
1462
1463 return 0;
1464
1465 out3:
1466 if (info->unbind)
1467 info->unbind (dev, udev);
1468 out1:
1469 free_netdev(net);
1470 out:
1471 usb_put_dev(xdev);
1472 return status;
1473 }
1474 EXPORT_SYMBOL_GPL(usbnet_probe);
1475
1476 /*-------------------------------------------------------------------------*/
1477
1478 /*
1479 * suspend the whole driver as soon as the first interface is suspended
1480 * resume only when the last interface is resumed
1481 */
1482
1483 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1484 {
1485 struct usbnet *dev = usb_get_intfdata(intf);
1486
1487 if (!dev->suspend_count++) {
1488 spin_lock_irq(&dev->txq.lock);
1489 /* don't autosuspend while transmitting */
1490 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1491 spin_unlock_irq(&dev->txq.lock);
1492 return -EBUSY;
1493 } else {
1494 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1495 spin_unlock_irq(&dev->txq.lock);
1496 }
1497 /*
1498 * accelerate emptying of the rx and queues, to avoid
1499 * having everything error out.
1500 */
1501 netif_device_detach (dev->net);
1502 usbnet_terminate_urbs(dev);
1503 usb_kill_urb(dev->interrupt);
1504
1505 /*
1506 * reattach so runtime management can use and
1507 * wake the device
1508 */
1509 netif_device_attach (dev->net);
1510 }
1511 return 0;
1512 }
1513 EXPORT_SYMBOL_GPL(usbnet_suspend);
1514
1515 int usbnet_resume (struct usb_interface *intf)
1516 {
1517 struct usbnet *dev = usb_get_intfdata(intf);
1518 struct sk_buff *skb;
1519 struct urb *res;
1520 int retval;
1521
1522 if (!--dev->suspend_count) {
1523 /* resume interrupt URBs */
1524 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1525 usb_submit_urb(dev->interrupt, GFP_NOIO);
1526
1527 spin_lock_irq(&dev->txq.lock);
1528 while ((res = usb_get_from_anchor(&dev->deferred))) {
1529
1530 skb = (struct sk_buff *)res->context;
1531 retval = usb_submit_urb(res, GFP_ATOMIC);
1532 if (retval < 0) {
1533 dev_kfree_skb_any(skb);
1534 usb_free_urb(res);
1535 usb_autopm_put_interface_async(dev->intf);
1536 } else {
1537 dev->net->trans_start = jiffies;
1538 __skb_queue_tail(&dev->txq, skb);
1539 }
1540 }
1541
1542 smp_mb();
1543 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1544 spin_unlock_irq(&dev->txq.lock);
1545
1546 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1547 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1548 netif_start_queue(dev->net);
1549 tasklet_schedule (&dev->bh);
1550 }
1551 }
1552 return 0;
1553 }
1554 EXPORT_SYMBOL_GPL(usbnet_resume);
1555
1556
1557 /*-------------------------------------------------------------------------*/
1558
1559 static int __init usbnet_init(void)
1560 {
1561 /* Compiler should optimize this out. */
1562 BUILD_BUG_ON(
1563 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1564
1565 random_ether_addr(node_id);
1566 return 0;
1567 }
1568 module_init(usbnet_init);
1569
1570 static void __exit usbnet_exit(void)
1571 {
1572 }
1573 module_exit(usbnet_exit);
1574
1575 MODULE_AUTHOR("David Brownell");
1576 MODULE_DESCRIPTION("USB network driver framework");
1577 MODULE_LICENSE("GPL");