projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
usbnet: introduce usbnet 3 command helpers
[deliverable/linux.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 struct usbnet *dev = urb->context;
186 int status = urb->status;
187
188 switch (status) {
189 /* success */
190 case 0:
191 dev->driver_info->status(dev, urb);
192 break;
193
194 /* software-driven interface shutdown */
195 case -ENOENT: /* urb killed */
196 case -ESHUTDOWN: /* hardware gone */
197 netif_dbg(dev, ifdown, dev->net,
198 "intr shutdown, code %d\n", status);
199 return;
200
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
203 */
204 default:
205 netdev_dbg(dev->net, "intr status %d\n", status);
206 break;
207 }
208
209 if (!netif_running (dev->net))
210 return;
211
212 status = usb_submit_urb (urb, GFP_ATOMIC);
213 if (status != 0)
214 netif_err(dev, timer, dev->net,
215 "intr resubmit --> %d\n", status);
216 }
217
218 static int init_status (struct usbnet *dev, struct usb_interface *intf)
219 {
220 char *buf = NULL;
221 unsigned pipe = 0;
222 unsigned maxp;
223 unsigned period;
224
225 if (!dev->driver_info->status)
226 return 0;
227
228 pipe = usb_rcvintpipe (dev->udev,
229 dev->status->desc.bEndpointAddress
230 & USB_ENDPOINT_NUMBER_MASK);
231 maxp = usb_maxpacket (dev->udev, pipe, 0);
232
233 /* avoid 1 msec chatter: min 8 msec poll rate */
234 period = max ((int) dev->status->desc.bInterval,
235 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
236
237 buf = kmalloc (maxp, GFP_KERNEL);
238 if (buf) {
239 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
240 if (!dev->interrupt) {
241 kfree (buf);
242 return -ENOMEM;
243 } else {
244 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
245 buf, maxp, intr_complete, dev, period);
246 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
247 dev_dbg(&intf->dev,
248 "status ep%din, %d bytes period %d\n",
249 usb_pipeendpoint(pipe), maxp, period);
250 }
251 }
252 return 0;
253 }
254
255 /* Passes this packet up the stack, updating its accounting.
256 * Some link protocols batch packets, so their rx_fixup paths
257 * can return clones as well as just modify the original skb.
258 */
259 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
260 {
261 int status;
262
263 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
264 skb_queue_tail(&dev->rxq_pause, skb);
265 return;
266 }
267
268 skb->protocol = eth_type_trans (skb, dev->net);
269 dev->net->stats.rx_packets++;
270 dev->net->stats.rx_bytes += skb->len;
271
272 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
273 skb->len + sizeof (struct ethhdr), skb->protocol);
274 memset (skb->cb, 0, sizeof (struct skb_data));
275
276 if (skb_defer_rx_timestamp(skb))
277 return;
278
279 status = netif_rx (skb);
280 if (status != NET_RX_SUCCESS)
281 netif_dbg(dev, rx_err, dev->net,
282 "netif_rx status %d\n", status);
283 }
284 EXPORT_SYMBOL_GPL(usbnet_skb_return);
285
286 \f
287 /*-------------------------------------------------------------------------
288 *
289 * Network Device Driver (peer link to "Host Device", from USB host)
290 *
291 *-------------------------------------------------------------------------*/
292
293 int usbnet_change_mtu (struct net_device *net, int new_mtu)
294 {
295 struct usbnet *dev = netdev_priv(net);
296 int ll_mtu = new_mtu + net->hard_header_len;
297 int old_hard_mtu = dev->hard_mtu;
298 int old_rx_urb_size = dev->rx_urb_size;
299
300 if (new_mtu <= 0)
301 return -EINVAL;
302 // no second zero-length packet read wanted after mtu-sized packets
303 if ((ll_mtu % dev->maxpacket) == 0)
304 return -EDOM;
305 net->mtu = new_mtu;
306
307 dev->hard_mtu = net->mtu + net->hard_header_len;
308 if (dev->rx_urb_size == old_hard_mtu) {
309 dev->rx_urb_size = dev->hard_mtu;
310 if (dev->rx_urb_size > old_rx_urb_size)
311 usbnet_unlink_rx_urbs(dev);
312 }
313
314 return 0;
315 }
316 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
317
318 /* The caller must hold list->lock */
319 static void __usbnet_queue_skb(struct sk_buff_head *list,
320 struct sk_buff *newsk, enum skb_state state)
321 {
322 struct skb_data *entry = (struct skb_data *) newsk->cb;
323
324 __skb_queue_tail(list, newsk);
325 entry->state = state;
326 }
327
328 /*-------------------------------------------------------------------------*/
329
330 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
331 * completion callbacks. 2.5 should have fixed those bugs...
332 */
333
334 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
335 struct sk_buff_head *list, enum skb_state state)
336 {
337 unsigned long flags;
338 enum skb_state old_state;
339 struct skb_data *entry = (struct skb_data *) skb->cb;
340
341 spin_lock_irqsave(&list->lock, flags);
342 old_state = entry->state;
343 entry->state = state;
344 __skb_unlink(skb, list);
345 spin_unlock(&list->lock);
346 spin_lock(&dev->done.lock);
347 __skb_queue_tail(&dev->done, skb);
348 if (dev->done.qlen == 1)
349 tasklet_schedule(&dev->bh);
350 spin_unlock_irqrestore(&dev->done.lock, flags);
351 return old_state;
352 }
353
354 /* some work can't be done in tasklets, so we use keventd
355 *
356 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
357 * but tasklet_schedule() doesn't. hope the failure is rare.
358 */
359 void usbnet_defer_kevent (struct usbnet *dev, int work)
360 {
361 set_bit (work, &dev->flags);
362 if (!schedule_work (&dev->kevent))
363 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
364 else
365 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
366 }
367 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
368
369 /*-------------------------------------------------------------------------*/
370
371 static void rx_complete (struct urb *urb);
372
373 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
374 {
375 struct sk_buff *skb;
376 struct skb_data *entry;
377 int retval = 0;
378 unsigned long lockflags;
379 size_t size = dev->rx_urb_size;
380
381 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
382 if (!skb) {
383 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
384 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
385 usb_free_urb (urb);
386 return -ENOMEM;
387 }
388
389 entry = (struct skb_data *) skb->cb;
390 entry->urb = urb;
391 entry->dev = dev;
392 entry->length = 0;
393
394 usb_fill_bulk_urb (urb, dev->udev, dev->in,
395 skb->data, size, rx_complete, skb);
396
397 spin_lock_irqsave (&dev->rxq.lock, lockflags);
398
399 if (netif_running (dev->net) &&
400 netif_device_present (dev->net) &&
401 !test_bit (EVENT_RX_HALT, &dev->flags) &&
402 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
403 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
404 case -EPIPE:
405 usbnet_defer_kevent (dev, EVENT_RX_HALT);
406 break;
407 case -ENOMEM:
408 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
409 break;
410 case -ENODEV:
411 netif_dbg(dev, ifdown, dev->net, "device gone\n");
412 netif_device_detach (dev->net);
413 break;
414 case -EHOSTUNREACH:
415 retval = -ENOLINK;
416 break;
417 default:
418 netif_dbg(dev, rx_err, dev->net,
419 "rx submit, %d\n", retval);
420 tasklet_schedule (&dev->bh);
421 break;
422 case 0:
423 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
424 }
425 } else {
426 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
427 retval = -ENOLINK;
428 }
429 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
430 if (retval) {
431 dev_kfree_skb_any (skb);
432 usb_free_urb (urb);
433 }
434 return retval;
435 }
436
437
438 /*-------------------------------------------------------------------------*/
439
440 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
441 {
442 if (dev->driver_info->rx_fixup &&
443 !dev->driver_info->rx_fixup (dev, skb)) {
444 /* With RX_ASSEMBLE, rx_fixup() must update counters */
445 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
446 dev->net->stats.rx_errors++;
447 goto done;
448 }
449 // else network stack removes extra byte if we forced a short packet
450
451 if (skb->len) {
452 /* all data was already cloned from skb inside the driver */
453 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
454 dev_kfree_skb_any(skb);
455 else
456 usbnet_skb_return(dev, skb);
457 return;
458 }
459
460 netif_dbg(dev, rx_err, dev->net, "drop\n");
461 dev->net->stats.rx_errors++;
462 done:
463 skb_queue_tail(&dev->done, skb);
464 }
465
466 /*-------------------------------------------------------------------------*/
467
468 static void rx_complete (struct urb *urb)
469 {
470 struct sk_buff *skb = (struct sk_buff *) urb->context;
471 struct skb_data *entry = (struct skb_data *) skb->cb;
472 struct usbnet *dev = entry->dev;
473 int urb_status = urb->status;
474 enum skb_state state;
475
476 skb_put (skb, urb->actual_length);
477 state = rx_done;
478 entry->urb = NULL;
479
480 switch (urb_status) {
481 /* success */
482 case 0:
483 if (skb->len < dev->net->hard_header_len) {
484 state = rx_cleanup;
485 dev->net->stats.rx_errors++;
486 dev->net->stats.rx_length_errors++;
487 netif_dbg(dev, rx_err, dev->net,
488 "rx length %d\n", skb->len);
489 }
490 break;
491
492 /* stalls need manual reset. this is rare ... except that
493 * when going through USB 2.0 TTs, unplug appears this way.
494 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
495 * storm, recovering as needed.
496 */
497 case -EPIPE:
498 dev->net->stats.rx_errors++;
499 usbnet_defer_kevent (dev, EVENT_RX_HALT);
500 // FALLTHROUGH
501
502 /* software-driven interface shutdown */
503 case -ECONNRESET: /* async unlink */
504 case -ESHUTDOWN: /* hardware gone */
505 netif_dbg(dev, ifdown, dev->net,
506 "rx shutdown, code %d\n", urb_status);
507 goto block;
508
509 /* we get controller i/o faults during khubd disconnect() delays.
510 * throttle down resubmits, to avoid log floods; just temporarily,
511 * so we still recover when the fault isn't a khubd delay.
512 */
513 case -EPROTO:
514 case -ETIME:
515 case -EILSEQ:
516 dev->net->stats.rx_errors++;
517 if (!timer_pending (&dev->delay)) {
518 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
519 netif_dbg(dev, link, dev->net,
520 "rx throttle %d\n", urb_status);
521 }
522 block:
523 state = rx_cleanup;
524 entry->urb = urb;
525 urb = NULL;
526 break;
527
528 /* data overrun ... flush fifo? */
529 case -EOVERFLOW:
530 dev->net->stats.rx_over_errors++;
531 // FALLTHROUGH
532
533 default:
534 state = rx_cleanup;
535 dev->net->stats.rx_errors++;
536 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
537 break;
538 }
539
540 state = defer_bh(dev, skb, &dev->rxq, state);
541
542 if (urb) {
543 if (netif_running (dev->net) &&
544 !test_bit (EVENT_RX_HALT, &dev->flags) &&
545 state != unlink_start) {
546 rx_submit (dev, urb, GFP_ATOMIC);
547 usb_mark_last_busy(dev->udev);
548 return;
549 }
550 usb_free_urb (urb);
551 }
552 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
553 }
554
555 /*-------------------------------------------------------------------------*/
556 void usbnet_pause_rx(struct usbnet *dev)
557 {
558 set_bit(EVENT_RX_PAUSED, &dev->flags);
559
560 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
561 }
562 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
563
564 void usbnet_resume_rx(struct usbnet *dev)
565 {
566 struct sk_buff *skb;
567 int num = 0;
568
569 clear_bit(EVENT_RX_PAUSED, &dev->flags);
570
571 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
572 usbnet_skb_return(dev, skb);
573 num++;
574 }
575
576 tasklet_schedule(&dev->bh);
577
578 netif_dbg(dev, rx_status, dev->net,
579 "paused rx queue disabled, %d skbs requeued\n", num);
580 }
581 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
582
583 void usbnet_purge_paused_rxq(struct usbnet *dev)
584 {
585 skb_queue_purge(&dev->rxq_pause);
586 }
587 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
588
589 /*-------------------------------------------------------------------------*/
590
591 // unlink pending rx/tx; completion handlers do all other cleanup
592
593 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
594 {
595 unsigned long flags;
596 struct sk_buff *skb;
597 int count = 0;
598
599 spin_lock_irqsave (&q->lock, flags);
600 while (!skb_queue_empty(q)) {
601 struct skb_data *entry;
602 struct urb *urb;
603 int retval;
604
605 skb_queue_walk(q, skb) {
606 entry = (struct skb_data *) skb->cb;
607 if (entry->state != unlink_start)
608 goto found;
609 }
610 break;
611 found:
612 entry->state = unlink_start;
613 urb = entry->urb;
614
615 /*
616 * Get reference count of the URB to avoid it to be
617 * freed during usb_unlink_urb, which may trigger
618 * use-after-free problem inside usb_unlink_urb since
619 * usb_unlink_urb is always racing with .complete
620 * handler(include defer_bh).
621 */
622 usb_get_urb(urb);
623 spin_unlock_irqrestore(&q->lock, flags);
624 // during some PM-driven resume scenarios,
625 // these (async) unlinks complete immediately
626 retval = usb_unlink_urb (urb);
627 if (retval != -EINPROGRESS && retval != 0)
628 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
629 else
630 count++;
631 usb_put_urb(urb);
632 spin_lock_irqsave(&q->lock, flags);
633 }
634 spin_unlock_irqrestore (&q->lock, flags);
635 return count;
636 }
637
638 // Flush all pending rx urbs
639 // minidrivers may need to do this when the MTU changes
640
641 void usbnet_unlink_rx_urbs(struct usbnet *dev)
642 {
643 if (netif_running(dev->net)) {
644 (void) unlink_urbs (dev, &dev->rxq);
645 tasklet_schedule(&dev->bh);
646 }
647 }
648 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
649
650 /*-------------------------------------------------------------------------*/
651
652 // precondition: never called in_interrupt
653 static void usbnet_terminate_urbs(struct usbnet *dev)
654 {
655 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
656 DECLARE_WAITQUEUE(wait, current);
657 int temp;
658
659 /* ensure there are no more active urbs */
660 add_wait_queue(&unlink_wakeup, &wait);
661 set_current_state(TASK_UNINTERRUPTIBLE);
662 dev->wait = &unlink_wakeup;
663 temp = unlink_urbs(dev, &dev->txq) +
664 unlink_urbs(dev, &dev->rxq);
665
666 /* maybe wait for deletions to finish. */
667 while (!skb_queue_empty(&dev->rxq)
668 && !skb_queue_empty(&dev->txq)
669 && !skb_queue_empty(&dev->done)) {
670 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
671 set_current_state(TASK_UNINTERRUPTIBLE);
672 netif_dbg(dev, ifdown, dev->net,
673 "waited for %d urb completions\n", temp);
674 }
675 set_current_state(TASK_RUNNING);
676 dev->wait = NULL;
677 remove_wait_queue(&unlink_wakeup, &wait);
678 }
679
680 int usbnet_stop (struct net_device *net)
681 {
682 struct usbnet *dev = netdev_priv(net);
683 struct driver_info *info = dev->driver_info;
684 int retval;
685
686 clear_bit(EVENT_DEV_OPEN, &dev->flags);
687 netif_stop_queue (net);
688
689 netif_info(dev, ifdown, dev->net,
690 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
691 net->stats.rx_packets, net->stats.tx_packets,
692 net->stats.rx_errors, net->stats.tx_errors);
693
694 /* allow minidriver to stop correctly (wireless devices to turn off
695 * radio etc) */
696 if (info->stop) {
697 retval = info->stop(dev);
698 if (retval < 0)
699 netif_info(dev, ifdown, dev->net,
700 "stop fail (%d) usbnet usb-%s-%s, %s\n",
701 retval,
702 dev->udev->bus->bus_name, dev->udev->devpath,
703 info->description);
704 }
705
706 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
707 usbnet_terminate_urbs(dev);
708
709 usb_kill_urb(dev->interrupt);
710
711 usbnet_purge_paused_rxq(dev);
712
713 /* deferred work (task, timer, softirq) must also stop.
714 * can't flush_scheduled_work() until we drop rtnl (later),
715 * else workers could deadlock; so make workers a NOP.
716 */
717 dev->flags = 0;
718 del_timer_sync (&dev->delay);
719 tasklet_kill (&dev->bh);
720 if (info->manage_power)
721 info->manage_power(dev, 0);
722 else
723 usb_autopm_put_interface(dev->intf);
724
725 return 0;
726 }
727 EXPORT_SYMBOL_GPL(usbnet_stop);
728
729 /*-------------------------------------------------------------------------*/
730
731 // posts reads, and enables write queuing
732
733 // precondition: never called in_interrupt
734
735 int usbnet_open (struct net_device *net)
736 {
737 struct usbnet *dev = netdev_priv(net);
738 int retval;
739 struct driver_info *info = dev->driver_info;
740
741 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
742 netif_info(dev, ifup, dev->net,
743 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
744 retval,
745 dev->udev->bus->bus_name,
746 dev->udev->devpath,
747 info->description);
748 goto done_nopm;
749 }
750
751 // put into "known safe" state
752 if (info->reset && (retval = info->reset (dev)) < 0) {
753 netif_info(dev, ifup, dev->net,
754 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
755 retval,
756 dev->udev->bus->bus_name,
757 dev->udev->devpath,
758 info->description);
759 goto done;
760 }
761
762 // insist peer be connected
763 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
764 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
765 goto done;
766 }
767
768 /* start any status interrupt transfer */
769 if (dev->interrupt) {
770 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
771 if (retval < 0) {
772 netif_err(dev, ifup, dev->net,
773 "intr submit %d\n", retval);
774 goto done;
775 }
776 }
777
778 set_bit(EVENT_DEV_OPEN, &dev->flags);
779 netif_start_queue (net);
780 netif_info(dev, ifup, dev->net,
781 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
782 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
783 dev->net->mtu,
784 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
785 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
786 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
787 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
788 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
789 "simple");
790
791 // delay posting reads until we're fully open
792 tasklet_schedule (&dev->bh);
793 if (info->manage_power) {
794 retval = info->manage_power(dev, 1);
795 if (retval < 0)
796 goto done_manage_power_error;
797 usb_autopm_put_interface(dev->intf);
798 }
799 return retval;
800
801 done_manage_power_error:
802 clear_bit(EVENT_DEV_OPEN, &dev->flags);
803 done:
804 usb_autopm_put_interface(dev->intf);
805 done_nopm:
806 return retval;
807 }
808 EXPORT_SYMBOL_GPL(usbnet_open);
809
810 /*-------------------------------------------------------------------------*/
811
812 /* ethtool methods; minidrivers may need to add some more, but
813 * they'll probably want to use this base set.
814 */
815
816 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
817 {
818 struct usbnet *dev = netdev_priv(net);
819
820 if (!dev->mii.mdio_read)
821 return -EOPNOTSUPP;
822
823 return mii_ethtool_gset(&dev->mii, cmd);
824 }
825 EXPORT_SYMBOL_GPL(usbnet_get_settings);
826
827 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
828 {
829 struct usbnet *dev = netdev_priv(net);
830 int retval;
831
832 if (!dev->mii.mdio_write)
833 return -EOPNOTSUPP;
834
835 retval = mii_ethtool_sset(&dev->mii, cmd);
836
837 /* link speed/duplex might have changed */
838 if (dev->driver_info->link_reset)
839 dev->driver_info->link_reset(dev);
840
841 return retval;
842
843 }
844 EXPORT_SYMBOL_GPL(usbnet_set_settings);
845
846 u32 usbnet_get_link (struct net_device *net)
847 {
848 struct usbnet *dev = netdev_priv(net);
849
850 /* If a check_connect is defined, return its result */
851 if (dev->driver_info->check_connect)
852 return dev->driver_info->check_connect (dev) == 0;
853
854 /* if the device has mii operations, use those */
855 if (dev->mii.mdio_read)
856 return mii_link_ok(&dev->mii);
857
858 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
859 return ethtool_op_get_link(net);
860 }
861 EXPORT_SYMBOL_GPL(usbnet_get_link);
862
863 int usbnet_nway_reset(struct net_device *net)
864 {
865 struct usbnet *dev = netdev_priv(net);
866
867 if (!dev->mii.mdio_write)
868 return -EOPNOTSUPP;
869
870 return mii_nway_restart(&dev->mii);
871 }
872 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
873
874 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
875 {
876 struct usbnet *dev = netdev_priv(net);
877
878 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
879 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
880 strlcpy (info->fw_version, dev->driver_info->description,
881 sizeof info->fw_version);
882 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
883 }
884 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
885
886 u32 usbnet_get_msglevel (struct net_device *net)
887 {
888 struct usbnet *dev = netdev_priv(net);
889
890 return dev->msg_enable;
891 }
892 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
893
894 void usbnet_set_msglevel (struct net_device *net, u32 level)
895 {
896 struct usbnet *dev = netdev_priv(net);
897
898 dev->msg_enable = level;
899 }
900 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
901
902 /* drivers may override default ethtool_ops in their bind() routine */
903 static const struct ethtool_ops usbnet_ethtool_ops = {
904 .get_settings = usbnet_get_settings,
905 .set_settings = usbnet_set_settings,
906 .get_link = usbnet_get_link,
907 .nway_reset = usbnet_nway_reset,
908 .get_drvinfo = usbnet_get_drvinfo,
909 .get_msglevel = usbnet_get_msglevel,
910 .set_msglevel = usbnet_set_msglevel,
911 .get_ts_info = ethtool_op_get_ts_info,
912 };
913
914 /*-------------------------------------------------------------------------*/
915
916 /* work that cannot be done in interrupt context uses keventd.
917 *
918 * NOTE: with 2.5 we could do more of this using completion callbacks,
919 * especially now that control transfers can be queued.
920 */
921 static void
922 kevent (struct work_struct *work)
923 {
924 struct usbnet *dev =
925 container_of(work, struct usbnet, kevent);
926 int status;
927
928 /* usb_clear_halt() needs a thread context */
929 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
930 unlink_urbs (dev, &dev->txq);
931 status = usb_autopm_get_interface(dev->intf);
932 if (status < 0)
933 goto fail_pipe;
934 status = usb_clear_halt (dev->udev, dev->out);
935 usb_autopm_put_interface(dev->intf);
936 if (status < 0 &&
937 status != -EPIPE &&
938 status != -ESHUTDOWN) {
939 if (netif_msg_tx_err (dev))
940 fail_pipe:
941 netdev_err(dev->net, "can't clear tx halt, status %d\n",
942 status);
943 } else {
944 clear_bit (EVENT_TX_HALT, &dev->flags);
945 if (status != -ESHUTDOWN)
946 netif_wake_queue (dev->net);
947 }
948 }
949 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
950 unlink_urbs (dev, &dev->rxq);
951 status = usb_autopm_get_interface(dev->intf);
952 if (status < 0)
953 goto fail_halt;
954 status = usb_clear_halt (dev->udev, dev->in);
955 usb_autopm_put_interface(dev->intf);
956 if (status < 0 &&
957 status != -EPIPE &&
958 status != -ESHUTDOWN) {
959 if (netif_msg_rx_err (dev))
960 fail_halt:
961 netdev_err(dev->net, "can't clear rx halt, status %d\n",
962 status);
963 } else {
964 clear_bit (EVENT_RX_HALT, &dev->flags);
965 tasklet_schedule (&dev->bh);
966 }
967 }
968
969 /* tasklet could resubmit itself forever if memory is tight */
970 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
971 struct urb *urb = NULL;
972 int resched = 1;
973
974 if (netif_running (dev->net))
975 urb = usb_alloc_urb (0, GFP_KERNEL);
976 else
977 clear_bit (EVENT_RX_MEMORY, &dev->flags);
978 if (urb != NULL) {
979 clear_bit (EVENT_RX_MEMORY, &dev->flags);
980 status = usb_autopm_get_interface(dev->intf);
981 if (status < 0) {
982 usb_free_urb(urb);
983 goto fail_lowmem;
984 }
985 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
986 resched = 0;
987 usb_autopm_put_interface(dev->intf);
988 fail_lowmem:
989 if (resched)
990 tasklet_schedule (&dev->bh);
991 }
992 }
993
994 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
995 struct driver_info *info = dev->driver_info;
996 int retval = 0;
997
998 clear_bit (EVENT_LINK_RESET, &dev->flags);
999 status = usb_autopm_get_interface(dev->intf);
1000 if (status < 0)
1001 goto skip_reset;
1002 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1003 usb_autopm_put_interface(dev->intf);
1004 skip_reset:
1005 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1006 retval,
1007 dev->udev->bus->bus_name,
1008 dev->udev->devpath,
1009 info->description);
1010 } else {
1011 usb_autopm_put_interface(dev->intf);
1012 }
1013 }
1014
1015 if (dev->flags)
1016 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1017 }
1018
1019 /*-------------------------------------------------------------------------*/
1020
1021 static void tx_complete (struct urb *urb)
1022 {
1023 struct sk_buff *skb = (struct sk_buff *) urb->context;
1024 struct skb_data *entry = (struct skb_data *) skb->cb;
1025 struct usbnet *dev = entry->dev;
1026
1027 if (urb->status == 0) {
1028 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1029 dev->net->stats.tx_packets++;
1030 dev->net->stats.tx_bytes += entry->length;
1031 } else {
1032 dev->net->stats.tx_errors++;
1033
1034 switch (urb->status) {
1035 case -EPIPE:
1036 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1037 break;
1038
1039 /* software-driven interface shutdown */
1040 case -ECONNRESET: // async unlink
1041 case -ESHUTDOWN: // hardware gone
1042 break;
1043
1044 // like rx, tx gets controller i/o faults during khubd delays
1045 // and so it uses the same throttling mechanism.
1046 case -EPROTO:
1047 case -ETIME:
1048 case -EILSEQ:
1049 usb_mark_last_busy(dev->udev);
1050 if (!timer_pending (&dev->delay)) {
1051 mod_timer (&dev->delay,
1052 jiffies + THROTTLE_JIFFIES);
1053 netif_dbg(dev, link, dev->net,
1054 "tx throttle %d\n", urb->status);
1055 }
1056 netif_stop_queue (dev->net);
1057 break;
1058 default:
1059 netif_dbg(dev, tx_err, dev->net,
1060 "tx err %d\n", entry->urb->status);
1061 break;
1062 }
1063 }
1064
1065 usb_autopm_put_interface_async(dev->intf);
1066 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1067 }
1068
1069 /*-------------------------------------------------------------------------*/
1070
1071 void usbnet_tx_timeout (struct net_device *net)
1072 {
1073 struct usbnet *dev = netdev_priv(net);
1074
1075 unlink_urbs (dev, &dev->txq);
1076 tasklet_schedule (&dev->bh);
1077
1078 // FIXME: device recovery -- reset?
1079 }
1080 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1081
1082 /*-------------------------------------------------------------------------*/
1083
1084 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1085 struct net_device *net)
1086 {
1087 struct usbnet *dev = netdev_priv(net);
1088 int length;
1089 struct urb *urb = NULL;
1090 struct skb_data *entry;
1091 struct driver_info *info = dev->driver_info;
1092 unsigned long flags;
1093 int retval;
1094
1095 if (skb)
1096 skb_tx_timestamp(skb);
1097
1098 // some devices want funky USB-level framing, for
1099 // win32 driver (usually) and/or hardware quirks
1100 if (info->tx_fixup) {
1101 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1102 if (!skb) {
1103 if (netif_msg_tx_err(dev)) {
1104 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1105 goto drop;
1106 } else {
1107 /* cdc_ncm collected packet; waits for more */
1108 goto not_drop;
1109 }
1110 }
1111 }
1112 length = skb->len;
1113
1114 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1115 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1116 goto drop;
1117 }
1118
1119 entry = (struct skb_data *) skb->cb;
1120 entry->urb = urb;
1121 entry->dev = dev;
1122 entry->length = length;
1123
1124 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1125 skb->data, skb->len, tx_complete, skb);
1126
1127 /* don't assume the hardware handles USB_ZERO_PACKET
1128 * NOTE: strictly conforming cdc-ether devices should expect
1129 * the ZLP here, but ignore the one-byte packet.
1130 * NOTE2: CDC NCM specification is different from CDC ECM when
1131 * handling ZLP/short packets, so cdc_ncm driver will make short
1132 * packet itself if needed.
1133 */
1134 if (length % dev->maxpacket == 0) {
1135 if (!(info->flags & FLAG_SEND_ZLP)) {
1136 if (!(info->flags & FLAG_MULTI_PACKET)) {
1137 urb->transfer_buffer_length++;
1138 if (skb_tailroom(skb)) {
1139 skb->data[skb->len] = 0;
1140 __skb_put(skb, 1);
1141 }
1142 }
1143 } else
1144 urb->transfer_flags |= URB_ZERO_PACKET;
1145 }
1146
1147 spin_lock_irqsave(&dev->txq.lock, flags);
1148 retval = usb_autopm_get_interface_async(dev->intf);
1149 if (retval < 0) {
1150 spin_unlock_irqrestore(&dev->txq.lock, flags);
1151 goto drop;
1152 }
1153
1154 #ifdef CONFIG_PM
1155 /* if this triggers the device is still a sleep */
1156 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1157 /* transmission will be done in resume */
1158 usb_anchor_urb(urb, &dev->deferred);
1159 /* no use to process more packets */
1160 netif_stop_queue(net);
1161 spin_unlock_irqrestore(&dev->txq.lock, flags);
1162 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1163 goto deferred;
1164 }
1165 #endif
1166
1167 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1168 case -EPIPE:
1169 netif_stop_queue (net);
1170 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1171 usb_autopm_put_interface_async(dev->intf);
1172 break;
1173 default:
1174 usb_autopm_put_interface_async(dev->intf);
1175 netif_dbg(dev, tx_err, dev->net,
1176 "tx: submit urb err %d\n", retval);
1177 break;
1178 case 0:
1179 net->trans_start = jiffies;
1180 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1181 if (dev->txq.qlen >= TX_QLEN (dev))
1182 netif_stop_queue (net);
1183 }
1184 spin_unlock_irqrestore (&dev->txq.lock, flags);
1185
1186 if (retval) {
1187 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1188 drop:
1189 dev->net->stats.tx_dropped++;
1190 not_drop:
1191 if (skb)
1192 dev_kfree_skb_any (skb);
1193 usb_free_urb (urb);
1194 } else
1195 netif_dbg(dev, tx_queued, dev->net,
1196 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1197 #ifdef CONFIG_PM
1198 deferred:
1199 #endif
1200 return NETDEV_TX_OK;
1201 }
1202 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1203
1204 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1205 {
1206 struct urb *urb;
1207 int i;
1208 int ret = 0;
1209
1210 /* don't refill the queue all at once */
1211 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1212 urb = usb_alloc_urb(0, flags);
1213 if (urb != NULL) {
1214 ret = rx_submit(dev, urb, flags);
1215 if (ret)
1216 goto err;
1217 } else {
1218 ret = -ENOMEM;
1219 goto err;
1220 }
1221 }
1222 err:
1223 return ret;
1224 }
1225
1226 /*-------------------------------------------------------------------------*/
1227
1228 // tasklet (work deferred from completions, in_irq) or timer
1229
1230 static void usbnet_bh (unsigned long param)
1231 {
1232 struct usbnet *dev = (struct usbnet *) param;
1233 struct sk_buff *skb;
1234 struct skb_data *entry;
1235
1236 while ((skb = skb_dequeue (&dev->done))) {
1237 entry = (struct skb_data *) skb->cb;
1238 switch (entry->state) {
1239 case rx_done:
1240 entry->state = rx_cleanup;
1241 rx_process (dev, skb);
1242 continue;
1243 case tx_done:
1244 case rx_cleanup:
1245 usb_free_urb (entry->urb);
1246 dev_kfree_skb (skb);
1247 continue;
1248 default:
1249 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1250 }
1251 }
1252
1253 // waiting for all pending urbs to complete?
1254 if (dev->wait) {
1255 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1256 wake_up (dev->wait);
1257 }
1258
1259 // or are we maybe short a few urbs?
1260 } else if (netif_running (dev->net) &&
1261 netif_device_present (dev->net) &&
1262 !timer_pending (&dev->delay) &&
1263 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1264 int temp = dev->rxq.qlen;
1265
1266 if (temp < RX_QLEN(dev)) {
1267 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1268 return;
1269 if (temp != dev->rxq.qlen)
1270 netif_dbg(dev, link, dev->net,
1271 "rxqlen %d --> %d\n",
1272 temp, dev->rxq.qlen);
1273 if (dev->rxq.qlen < RX_QLEN(dev))
1274 tasklet_schedule (&dev->bh);
1275 }
1276 if (dev->txq.qlen < TX_QLEN (dev))
1277 netif_wake_queue (dev->net);
1278 }
1279 }
1280
1281
1282 /*-------------------------------------------------------------------------
1283 *
1284 * USB Device Driver support
1285 *
1286 *-------------------------------------------------------------------------*/
1287
1288 // precondition: never called in_interrupt
1289
1290 void usbnet_disconnect (struct usb_interface *intf)
1291 {
1292 struct usbnet *dev;
1293 struct usb_device *xdev;
1294 struct net_device *net;
1295
1296 dev = usb_get_intfdata(intf);
1297 usb_set_intfdata(intf, NULL);
1298 if (!dev)
1299 return;
1300
1301 xdev = interface_to_usbdev (intf);
1302
1303 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1304 intf->dev.driver->name,
1305 xdev->bus->bus_name, xdev->devpath,
1306 dev->driver_info->description);
1307
1308 net = dev->net;
1309 unregister_netdev (net);
1310
1311 cancel_work_sync(&dev->kevent);
1312
1313 if (dev->driver_info->unbind)
1314 dev->driver_info->unbind (dev, intf);
1315
1316 usb_kill_urb(dev->interrupt);
1317 usb_free_urb(dev->interrupt);
1318
1319 free_netdev(net);
1320 }
1321 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1322
1323 static const struct net_device_ops usbnet_netdev_ops = {
1324 .ndo_open = usbnet_open,
1325 .ndo_stop = usbnet_stop,
1326 .ndo_start_xmit = usbnet_start_xmit,
1327 .ndo_tx_timeout = usbnet_tx_timeout,
1328 .ndo_change_mtu = usbnet_change_mtu,
1329 .ndo_set_mac_address = eth_mac_addr,
1330 .ndo_validate_addr = eth_validate_addr,
1331 };
1332
1333 /*-------------------------------------------------------------------------*/
1334
1335 // precondition: never called in_interrupt
1336
1337 static struct device_type wlan_type = {
1338 .name = "wlan",
1339 };
1340
1341 static struct device_type wwan_type = {
1342 .name = "wwan",
1343 };
1344
1345 int
1346 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1347 {
1348 struct usbnet *dev;
1349 struct net_device *net;
1350 struct usb_host_interface *interface;
1351 struct driver_info *info;
1352 struct usb_device *xdev;
1353 int status;
1354 const char *name;
1355 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1356
1357 /* usbnet already took usb runtime pm, so have to enable the feature
1358 * for usb interface, otherwise usb_autopm_get_interface may return
1359 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1360 */
1361 if (!driver->supports_autosuspend) {
1362 driver->supports_autosuspend = 1;
1363 pm_runtime_enable(&udev->dev);
1364 }
1365
1366 name = udev->dev.driver->name;
1367 info = (struct driver_info *) prod->driver_info;
1368 if (!info) {
1369 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1370 return -ENODEV;
1371 }
1372 xdev = interface_to_usbdev (udev);
1373 interface = udev->cur_altsetting;
1374
1375 status = -ENOMEM;
1376
1377 // set up our own records
1378 net = alloc_etherdev(sizeof(*dev));
1379 if (!net)
1380 goto out;
1381
1382 /* netdev_printk() needs this so do it as early as possible */
1383 SET_NETDEV_DEV(net, &udev->dev);
1384
1385 dev = netdev_priv(net);
1386 dev->udev = xdev;
1387 dev->intf = udev;
1388 dev->driver_info = info;
1389 dev->driver_name = name;
1390 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1391 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1392 skb_queue_head_init (&dev->rxq);
1393 skb_queue_head_init (&dev->txq);
1394 skb_queue_head_init (&dev->done);
1395 skb_queue_head_init(&dev->rxq_pause);
1396 dev->bh.func = usbnet_bh;
1397 dev->bh.data = (unsigned long) dev;
1398 INIT_WORK (&dev->kevent, kevent);
1399 init_usb_anchor(&dev->deferred);
1400 dev->delay.function = usbnet_bh;
1401 dev->delay.data = (unsigned long) dev;
1402 init_timer (&dev->delay);
1403 mutex_init (&dev->phy_mutex);
1404
1405 dev->net = net;
1406 strcpy (net->name, "usb%d");
1407 memcpy (net->dev_addr, node_id, sizeof node_id);
1408
1409 /* rx and tx sides can use different message sizes;
1410 * bind() should set rx_urb_size in that case.
1411 */
1412 dev->hard_mtu = net->mtu + net->hard_header_len;
1413 #if 0
1414 // dma_supported() is deeply broken on almost all architectures
1415 // possible with some EHCI controllers
1416 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1417 net->features |= NETIF_F_HIGHDMA;
1418 #endif
1419
1420 net->netdev_ops = &usbnet_netdev_ops;
1421 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1422 net->ethtool_ops = &usbnet_ethtool_ops;
1423
1424 // allow device-specific bind/init procedures
1425 // NOTE net->name still not usable ...
1426 if (info->bind) {
1427 status = info->bind (dev, udev);
1428 if (status < 0)
1429 goto out1;
1430
1431 // heuristic: "usb%d" for links we know are two-host,
1432 // else "eth%d" when there's reasonable doubt. userspace
1433 // can rename the link if it knows better.
1434 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1435 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1436 (net->dev_addr [0] & 0x02) == 0))
1437 strcpy (net->name, "eth%d");
1438 /* WLAN devices should always be named "wlan%d" */
1439 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1440 strcpy(net->name, "wlan%d");
1441 /* WWAN devices should always be named "wwan%d" */
1442 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1443 strcpy(net->name, "wwan%d");
1444
1445 /* maybe the remote can't receive an Ethernet MTU */
1446 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1447 net->mtu = dev->hard_mtu - net->hard_header_len;
1448 } else if (!info->in || !info->out)
1449 status = usbnet_get_endpoints (dev, udev);
1450 else {
1451 dev->in = usb_rcvbulkpipe (xdev, info->in);
1452 dev->out = usb_sndbulkpipe (xdev, info->out);
1453 if (!(info->flags & FLAG_NO_SETINT))
1454 status = usb_set_interface (xdev,
1455 interface->desc.bInterfaceNumber,
1456 interface->desc.bAlternateSetting);
1457 else
1458 status = 0;
1459
1460 }
1461 if (status >= 0 && dev->status)
1462 status = init_status (dev, udev);
1463 if (status < 0)
1464 goto out3;
1465
1466 if (!dev->rx_urb_size)
1467 dev->rx_urb_size = dev->hard_mtu;
1468 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1469
1470 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1471 SET_NETDEV_DEVTYPE(net, &wlan_type);
1472 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1473 SET_NETDEV_DEVTYPE(net, &wwan_type);
1474
1475 status = register_netdev (net);
1476 if (status)
1477 goto out4;
1478 netif_info(dev, probe, dev->net,
1479 "register '%s' at usb-%s-%s, %s, %pM\n",
1480 udev->dev.driver->name,
1481 xdev->bus->bus_name, xdev->devpath,
1482 dev->driver_info->description,
1483 net->dev_addr);
1484
1485 // ok, it's ready to go.
1486 usb_set_intfdata (udev, dev);
1487
1488 netif_device_attach (net);
1489
1490 if (dev->driver_info->flags & FLAG_LINK_INTR)
1491 netif_carrier_off(net);
1492
1493 return 0;
1494
1495 out4:
1496 usb_free_urb(dev->interrupt);
1497 out3:
1498 if (info->unbind)
1499 info->unbind (dev, udev);
1500 out1:
1501 free_netdev(net);
1502 out:
1503 return status;
1504 }
1505 EXPORT_SYMBOL_GPL(usbnet_probe);
1506
1507 /*-------------------------------------------------------------------------*/
1508
1509 /*
1510 * suspend the whole driver as soon as the first interface is suspended
1511 * resume only when the last interface is resumed
1512 */
1513
1514 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1515 {
1516 struct usbnet *dev = usb_get_intfdata(intf);
1517
1518 if (!dev->suspend_count++) {
1519 spin_lock_irq(&dev->txq.lock);
1520 /* don't autosuspend while transmitting */
1521 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1522 dev->suspend_count--;
1523 spin_unlock_irq(&dev->txq.lock);
1524 return -EBUSY;
1525 } else {
1526 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1527 spin_unlock_irq(&dev->txq.lock);
1528 }
1529 /*
1530 * accelerate emptying of the rx and queues, to avoid
1531 * having everything error out.
1532 */
1533 netif_device_detach (dev->net);
1534 usbnet_terminate_urbs(dev);
1535 usb_kill_urb(dev->interrupt);
1536
1537 /*
1538 * reattach so runtime management can use and
1539 * wake the device
1540 */
1541 netif_device_attach (dev->net);
1542 }
1543 return 0;
1544 }
1545 EXPORT_SYMBOL_GPL(usbnet_suspend);
1546
1547 int usbnet_resume (struct usb_interface *intf)
1548 {
1549 struct usbnet *dev = usb_get_intfdata(intf);
1550 struct sk_buff *skb;
1551 struct urb *res;
1552 int retval;
1553
1554 if (!--dev->suspend_count) {
1555 /* resume interrupt URBs */
1556 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1557 usb_submit_urb(dev->interrupt, GFP_NOIO);
1558
1559 spin_lock_irq(&dev->txq.lock);
1560 while ((res = usb_get_from_anchor(&dev->deferred))) {
1561
1562 skb = (struct sk_buff *)res->context;
1563 retval = usb_submit_urb(res, GFP_ATOMIC);
1564 if (retval < 0) {
1565 dev_kfree_skb_any(skb);
1566 usb_free_urb(res);
1567 usb_autopm_put_interface_async(dev->intf);
1568 } else {
1569 dev->net->trans_start = jiffies;
1570 __skb_queue_tail(&dev->txq, skb);
1571 }
1572 }
1573
1574 smp_mb();
1575 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1576 spin_unlock_irq(&dev->txq.lock);
1577
1578 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1579 /* handle remote wakeup ASAP */
1580 if (!dev->wait &&
1581 netif_device_present(dev->net) &&
1582 !timer_pending(&dev->delay) &&
1583 !test_bit(EVENT_RX_HALT, &dev->flags))
1584 rx_alloc_submit(dev, GFP_NOIO);
1585
1586 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1587 netif_tx_wake_all_queues(dev->net);
1588 tasklet_schedule (&dev->bh);
1589 }
1590 }
1591
1592 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1593 usb_autopm_get_interface_no_resume(intf);
1594
1595 return 0;
1596 }
1597 EXPORT_SYMBOL_GPL(usbnet_resume);
1598
1599 /*
1600 * Either a subdriver implements manage_power, then it is assumed to always
1601 * be ready to be suspended or it reports the readiness to be suspended
1602 * explicitly
1603 */
1604 void usbnet_device_suggests_idle(struct usbnet *dev)
1605 {
1606 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1607 dev->intf->needs_remote_wakeup = 1;
1608 usb_autopm_put_interface_async(dev->intf);
1609 }
1610 }
1611 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1612
1613 /*-------------------------------------------------------------------------*/
1614 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1615 u16 value, u16 index, void *data, u16 size)
1616 {
1617 void *buf = NULL;
1618 int err = -ENOMEM;
1619
1620 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1621 " value=0x%04x index=0x%04x size=%d\n",
1622 cmd, reqtype, value, index, size);
1623
1624 if (data) {
1625 buf = kmalloc(size, GFP_KERNEL);
1626 if (!buf)
1627 goto out;
1628 }
1629
1630 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1631 cmd, reqtype, value, index, buf, size,
1632 USB_CTRL_GET_TIMEOUT);
1633 if (err > 0 && err <= size)
1634 memcpy(data, buf, err);
1635 kfree(buf);
1636 out:
1637 return err;
1638 }
1639 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1640
1641 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1642 u16 value, u16 index, const void *data, u16 size)
1643 {
1644 void *buf = NULL;
1645 int err = -ENOMEM;
1646
1647 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1648 " value=0x%04x index=0x%04x size=%d\n",
1649 cmd, reqtype, value, index, size);
1650
1651 if (data) {
1652 buf = kmemdup(data, size, GFP_KERNEL);
1653 if (!buf)
1654 goto out;
1655 }
1656
1657 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1658 cmd, reqtype, value, index, buf, size,
1659 USB_CTRL_SET_TIMEOUT);
1660 kfree(buf);
1661
1662 out:
1663 return err;
1664 }
1665 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1666
1667 static void usbnet_async_cmd_cb(struct urb *urb)
1668 {
1669 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1670 int status = urb->status;
1671
1672 if (status < 0)
1673 dev_dbg(&urb->dev->dev, "%s failed with %d",
1674 __func__, status);
1675
1676 kfree(req);
1677 usb_free_urb(urb);
1678 }
1679
1680 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1681 u16 value, u16 index, const void *data, u16 size)
1682 {
1683 struct usb_ctrlrequest *req = NULL;
1684 struct urb *urb;
1685 int err = -ENOMEM;
1686 void *buf = NULL;
1687
1688 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1689 " value=0x%04x index=0x%04x size=%d\n",
1690 cmd, reqtype, value, index, size);
1691
1692 urb = usb_alloc_urb(0, GFP_ATOMIC);
1693 if (!urb) {
1694 netdev_err(dev->net, "Error allocating URB in"
1695 " %s!\n", __func__);
1696 goto fail;
1697 }
1698
1699 if (data) {
1700 buf = kmemdup(data, size, GFP_ATOMIC);
1701 if (!buf) {
1702 netdev_err(dev->net, "Error allocating buffer"
1703 " in %s!\n", __func__);
1704 goto fail_free;
1705 }
1706 }
1707
1708 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
1709 if (!req) {
1710 netdev_err(dev->net, "Failed to allocate memory for %s\n",
1711 __func__);
1712 goto fail_free_buf;
1713 }
1714
1715 req->bRequestType = reqtype;
1716 req->bRequest = cmd;
1717 req->wValue = cpu_to_le16(value);
1718 req->wIndex = cpu_to_le16(index);
1719 req->wLength = cpu_to_le16(size);
1720
1721 usb_fill_control_urb(urb, dev->udev,
1722 usb_sndctrlpipe(dev->udev, 0),
1723 (void *)req, buf, size,
1724 usbnet_async_cmd_cb, req);
1725 urb->transfer_flags |= URB_FREE_BUFFER;
1726
1727 err = usb_submit_urb(urb, GFP_ATOMIC);
1728 if (err < 0) {
1729 netdev_err(dev->net, "Error submitting the control"
1730 " message: status=%d\n", err);
1731 goto fail_free;
1732 }
1733 return 0;
1734
1735 fail_free_buf:
1736 kfree(buf);
1737 fail_free:
1738 kfree(req);
1739 usb_free_urb(urb);
1740 fail:
1741 return err;
1742
1743 }
1744 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
1745 /*-------------------------------------------------------------------------*/
1746
1747 static int __init usbnet_init(void)
1748 {
1749 /* Compiler should optimize this out. */
1750 BUILD_BUG_ON(
1751 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1752
1753 eth_random_addr(node_id);
1754 return 0;
1755 }
1756 module_init(usbnet_init);
1757
1758 static void __exit usbnet_exit(void)
1759 {
1760 }
1761 module_exit(usbnet_exit);
1762
1763 MODULE_AUTHOR("David Brownell");
1764 MODULE_DESCRIPTION("USB network driver framework");
1765 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.067812 seconds and 5 git commands to generate.