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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.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 altsetttings.
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 status = netif_rx (skb);
242 if (status != NET_RX_SUCCESS)
243 netif_dbg(dev, rx_err, dev->net,
244 "netif_rx status %d\n", status);
245 }
246 EXPORT_SYMBOL_GPL(usbnet_skb_return);
247
248 \f
249 /*-------------------------------------------------------------------------
250 *
251 * Network Device Driver (peer link to "Host Device", from USB host)
252 *
253 *-------------------------------------------------------------------------*/
254
255 int usbnet_change_mtu (struct net_device *net, int new_mtu)
256 {
257 struct usbnet *dev = netdev_priv(net);
258 int ll_mtu = new_mtu + net->hard_header_len;
259 int old_hard_mtu = dev->hard_mtu;
260 int old_rx_urb_size = dev->rx_urb_size;
261
262 if (new_mtu <= 0)
263 return -EINVAL;
264 // no second zero-length packet read wanted after mtu-sized packets
265 if ((ll_mtu % dev->maxpacket) == 0)
266 return -EDOM;
267 net->mtu = new_mtu;
268
269 dev->hard_mtu = net->mtu + net->hard_header_len;
270 if (dev->rx_urb_size == old_hard_mtu) {
271 dev->rx_urb_size = dev->hard_mtu;
272 if (dev->rx_urb_size > old_rx_urb_size)
273 usbnet_unlink_rx_urbs(dev);
274 }
275
276 return 0;
277 }
278 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
279
280 /*-------------------------------------------------------------------------*/
281
282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
284 */
285
286 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
287 {
288 unsigned long flags;
289
290 spin_lock_irqsave(&list->lock, flags);
291 __skb_unlink(skb, list);
292 spin_unlock(&list->lock);
293 spin_lock(&dev->done.lock);
294 __skb_queue_tail(&dev->done, skb);
295 if (dev->done.qlen == 1)
296 tasklet_schedule(&dev->bh);
297 spin_unlock_irqrestore(&dev->done.lock, flags);
298 }
299
300 /* some work can't be done in tasklets, so we use keventd
301 *
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
304 */
305 void usbnet_defer_kevent (struct usbnet *dev, int work)
306 {
307 set_bit (work, &dev->flags);
308 if (!schedule_work (&dev->kevent))
309 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
310 else
311 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
312 }
313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
314
315 /*-------------------------------------------------------------------------*/
316
317 static void rx_complete (struct urb *urb);
318
319 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
320 {
321 struct sk_buff *skb;
322 struct skb_data *entry;
323 int retval = 0;
324 unsigned long lockflags;
325 size_t size = dev->rx_urb_size;
326
327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
330 usb_free_urb (urb);
331 return -ENOMEM;
332 }
333 skb_reserve (skb, NET_IP_ALIGN);
334
335 entry = (struct skb_data *) skb->cb;
336 entry->urb = urb;
337 entry->dev = dev;
338 entry->state = rx_start;
339 entry->length = 0;
340
341 usb_fill_bulk_urb (urb, dev->udev, dev->in,
342 skb->data, size, rx_complete, skb);
343
344 spin_lock_irqsave (&dev->rxq.lock, lockflags);
345
346 if (netif_running (dev->net) &&
347 netif_device_present (dev->net) &&
348 !test_bit (EVENT_RX_HALT, &dev->flags) &&
349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
351 case -EPIPE:
352 usbnet_defer_kevent (dev, EVENT_RX_HALT);
353 break;
354 case -ENOMEM:
355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
356 break;
357 case -ENODEV:
358 netif_dbg(dev, ifdown, dev->net, "device gone\n");
359 netif_device_detach (dev->net);
360 break;
361 case -EHOSTUNREACH:
362 retval = -ENOLINK;
363 break;
364 default:
365 netif_dbg(dev, rx_err, dev->net,
366 "rx submit, %d\n", retval);
367 tasklet_schedule (&dev->bh);
368 break;
369 case 0:
370 __skb_queue_tail (&dev->rxq, skb);
371 }
372 } else {
373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
374 retval = -ENOLINK;
375 }
376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
377 if (retval) {
378 dev_kfree_skb_any (skb);
379 usb_free_urb (urb);
380 }
381 return retval;
382 }
383
384
385 /*-------------------------------------------------------------------------*/
386
387 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
388 {
389 if (dev->driver_info->rx_fixup &&
390 !dev->driver_info->rx_fixup (dev, skb))
391 goto error;
392 // else network stack removes extra byte if we forced a short packet
393
394 if (skb->len) {
395 /* all data was already cloned from skb inside the driver */
396 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
397 dev_kfree_skb_any(skb);
398 else
399 usbnet_skb_return(dev, skb);
400 return;
401 }
402
403 netif_dbg(dev, rx_err, dev->net, "drop\n");
404 error:
405 dev->net->stats.rx_errors++;
406 skb_queue_tail(&dev->done, skb);
407 }
408
409 /*-------------------------------------------------------------------------*/
410
411 static void rx_complete (struct urb *urb)
412 {
413 struct sk_buff *skb = (struct sk_buff *) urb->context;
414 struct skb_data *entry = (struct skb_data *) skb->cb;
415 struct usbnet *dev = entry->dev;
416 int urb_status = urb->status;
417
418 skb_put (skb, urb->actual_length);
419 entry->state = rx_done;
420 entry->urb = NULL;
421
422 switch (urb_status) {
423 /* success */
424 case 0:
425 if (skb->len < dev->net->hard_header_len) {
426 entry->state = rx_cleanup;
427 dev->net->stats.rx_errors++;
428 dev->net->stats.rx_length_errors++;
429 netif_dbg(dev, rx_err, dev->net,
430 "rx length %d\n", skb->len);
431 }
432 break;
433
434 /* stalls need manual reset. this is rare ... except that
435 * when going through USB 2.0 TTs, unplug appears this way.
436 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
437 * storm, recovering as needed.
438 */
439 case -EPIPE:
440 dev->net->stats.rx_errors++;
441 usbnet_defer_kevent (dev, EVENT_RX_HALT);
442 // FALLTHROUGH
443
444 /* software-driven interface shutdown */
445 case -ECONNRESET: /* async unlink */
446 case -ESHUTDOWN: /* hardware gone */
447 netif_dbg(dev, ifdown, dev->net,
448 "rx shutdown, code %d\n", urb_status);
449 goto block;
450
451 /* we get controller i/o faults during khubd disconnect() delays.
452 * throttle down resubmits, to avoid log floods; just temporarily,
453 * so we still recover when the fault isn't a khubd delay.
454 */
455 case -EPROTO:
456 case -ETIME:
457 case -EILSEQ:
458 dev->net->stats.rx_errors++;
459 if (!timer_pending (&dev->delay)) {
460 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
461 netif_dbg(dev, link, dev->net,
462 "rx throttle %d\n", urb_status);
463 }
464 block:
465 entry->state = rx_cleanup;
466 entry->urb = urb;
467 urb = NULL;
468 break;
469
470 /* data overrun ... flush fifo? */
471 case -EOVERFLOW:
472 dev->net->stats.rx_over_errors++;
473 // FALLTHROUGH
474
475 default:
476 entry->state = rx_cleanup;
477 dev->net->stats.rx_errors++;
478 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
479 break;
480 }
481
482 defer_bh(dev, skb, &dev->rxq);
483
484 if (urb) {
485 if (netif_running (dev->net) &&
486 !test_bit (EVENT_RX_HALT, &dev->flags)) {
487 rx_submit (dev, urb, GFP_ATOMIC);
488 return;
489 }
490 usb_free_urb (urb);
491 }
492 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
493 }
494
495 static void intr_complete (struct urb *urb)
496 {
497 struct usbnet *dev = urb->context;
498 int status = urb->status;
499
500 switch (status) {
501 /* success */
502 case 0:
503 dev->driver_info->status(dev, urb);
504 break;
505
506 /* software-driven interface shutdown */
507 case -ENOENT: /* urb killed */
508 case -ESHUTDOWN: /* hardware gone */
509 netif_dbg(dev, ifdown, dev->net,
510 "intr shutdown, code %d\n", status);
511 return;
512
513 /* NOTE: not throttling like RX/TX, since this endpoint
514 * already polls infrequently
515 */
516 default:
517 netdev_dbg(dev->net, "intr status %d\n", status);
518 break;
519 }
520
521 if (!netif_running (dev->net))
522 return;
523
524 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
525 status = usb_submit_urb (urb, GFP_ATOMIC);
526 if (status != 0)
527 netif_err(dev, timer, dev->net,
528 "intr resubmit --> %d\n", status);
529 }
530
531 /*-------------------------------------------------------------------------*/
532 void usbnet_pause_rx(struct usbnet *dev)
533 {
534 set_bit(EVENT_RX_PAUSED, &dev->flags);
535
536 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
537 }
538 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
539
540 void usbnet_resume_rx(struct usbnet *dev)
541 {
542 struct sk_buff *skb;
543 int num = 0;
544
545 clear_bit(EVENT_RX_PAUSED, &dev->flags);
546
547 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
548 usbnet_skb_return(dev, skb);
549 num++;
550 }
551
552 tasklet_schedule(&dev->bh);
553
554 netif_dbg(dev, rx_status, dev->net,
555 "paused rx queue disabled, %d skbs requeued\n", num);
556 }
557 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
558
559 void usbnet_purge_paused_rxq(struct usbnet *dev)
560 {
561 skb_queue_purge(&dev->rxq_pause);
562 }
563 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
564
565 /*-------------------------------------------------------------------------*/
566
567 // unlink pending rx/tx; completion handlers do all other cleanup
568
569 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
570 {
571 unsigned long flags;
572 struct sk_buff *skb, *skbnext;
573 int count = 0;
574
575 spin_lock_irqsave (&q->lock, flags);
576 skb_queue_walk_safe(q, skb, skbnext) {
577 struct skb_data *entry;
578 struct urb *urb;
579 int retval;
580
581 entry = (struct skb_data *) skb->cb;
582 urb = entry->urb;
583
584 // during some PM-driven resume scenarios,
585 // these (async) unlinks complete immediately
586 retval = usb_unlink_urb (urb);
587 if (retval != -EINPROGRESS && retval != 0)
588 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
589 else
590 count++;
591 }
592 spin_unlock_irqrestore (&q->lock, flags);
593 return count;
594 }
595
596 // Flush all pending rx urbs
597 // minidrivers may need to do this when the MTU changes
598
599 void usbnet_unlink_rx_urbs(struct usbnet *dev)
600 {
601 if (netif_running(dev->net)) {
602 (void) unlink_urbs (dev, &dev->rxq);
603 tasklet_schedule(&dev->bh);
604 }
605 }
606 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
607
608 /*-------------------------------------------------------------------------*/
609
610 // precondition: never called in_interrupt
611 static void usbnet_terminate_urbs(struct usbnet *dev)
612 {
613 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
614 DECLARE_WAITQUEUE(wait, current);
615 int temp;
616
617 /* ensure there are no more active urbs */
618 add_wait_queue(&unlink_wakeup, &wait);
619 set_current_state(TASK_UNINTERRUPTIBLE);
620 dev->wait = &unlink_wakeup;
621 temp = unlink_urbs(dev, &dev->txq) +
622 unlink_urbs(dev, &dev->rxq);
623
624 /* maybe wait for deletions to finish. */
625 while (!skb_queue_empty(&dev->rxq)
626 && !skb_queue_empty(&dev->txq)
627 && !skb_queue_empty(&dev->done)) {
628 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
629 set_current_state(TASK_UNINTERRUPTIBLE);
630 netif_dbg(dev, ifdown, dev->net,
631 "waited for %d urb completions\n", temp);
632 }
633 set_current_state(TASK_RUNNING);
634 dev->wait = NULL;
635 remove_wait_queue(&unlink_wakeup, &wait);
636 }
637
638 int usbnet_stop (struct net_device *net)
639 {
640 struct usbnet *dev = netdev_priv(net);
641 struct driver_info *info = dev->driver_info;
642 int retval;
643
644 netif_stop_queue (net);
645
646 netif_info(dev, ifdown, dev->net,
647 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
648 net->stats.rx_packets, net->stats.tx_packets,
649 net->stats.rx_errors, net->stats.tx_errors);
650
651 /* allow minidriver to stop correctly (wireless devices to turn off
652 * radio etc) */
653 if (info->stop) {
654 retval = info->stop(dev);
655 if (retval < 0)
656 netif_info(dev, ifdown, dev->net,
657 "stop fail (%d) usbnet usb-%s-%s, %s\n",
658 retval,
659 dev->udev->bus->bus_name, dev->udev->devpath,
660 info->description);
661 }
662
663 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
664 usbnet_terminate_urbs(dev);
665
666 usb_kill_urb(dev->interrupt);
667
668 usbnet_purge_paused_rxq(dev);
669
670 /* deferred work (task, timer, softirq) must also stop.
671 * can't flush_scheduled_work() until we drop rtnl (later),
672 * else workers could deadlock; so make workers a NOP.
673 */
674 dev->flags = 0;
675 del_timer_sync (&dev->delay);
676 tasklet_kill (&dev->bh);
677 if (info->manage_power)
678 info->manage_power(dev, 0);
679 else
680 usb_autopm_put_interface(dev->intf);
681
682 return 0;
683 }
684 EXPORT_SYMBOL_GPL(usbnet_stop);
685
686 /*-------------------------------------------------------------------------*/
687
688 // posts reads, and enables write queuing
689
690 // precondition: never called in_interrupt
691
692 int usbnet_open (struct net_device *net)
693 {
694 struct usbnet *dev = netdev_priv(net);
695 int retval;
696 struct driver_info *info = dev->driver_info;
697
698 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
699 netif_info(dev, ifup, dev->net,
700 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
701 retval,
702 dev->udev->bus->bus_name,
703 dev->udev->devpath,
704 info->description);
705 goto done_nopm;
706 }
707
708 // put into "known safe" state
709 if (info->reset && (retval = info->reset (dev)) < 0) {
710 netif_info(dev, ifup, dev->net,
711 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
712 retval,
713 dev->udev->bus->bus_name,
714 dev->udev->devpath,
715 info->description);
716 goto done;
717 }
718
719 // insist peer be connected
720 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
721 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
722 goto done;
723 }
724
725 /* start any status interrupt transfer */
726 if (dev->interrupt) {
727 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
728 if (retval < 0) {
729 netif_err(dev, ifup, dev->net,
730 "intr submit %d\n", retval);
731 goto done;
732 }
733 }
734
735 netif_start_queue (net);
736 netif_info(dev, ifup, dev->net,
737 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
738 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
739 dev->net->mtu,
740 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
741 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
742 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
743 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
744 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
745 "simple");
746
747 // delay posting reads until we're fully open
748 tasklet_schedule (&dev->bh);
749 if (info->manage_power) {
750 retval = info->manage_power(dev, 1);
751 if (retval < 0)
752 goto done;
753 usb_autopm_put_interface(dev->intf);
754 }
755 return retval;
756
757 done:
758 usb_autopm_put_interface(dev->intf);
759 done_nopm:
760 return retval;
761 }
762 EXPORT_SYMBOL_GPL(usbnet_open);
763
764 /*-------------------------------------------------------------------------*/
765
766 /* ethtool methods; minidrivers may need to add some more, but
767 * they'll probably want to use this base set.
768 */
769
770 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
771 {
772 struct usbnet *dev = netdev_priv(net);
773
774 if (!dev->mii.mdio_read)
775 return -EOPNOTSUPP;
776
777 return mii_ethtool_gset(&dev->mii, cmd);
778 }
779 EXPORT_SYMBOL_GPL(usbnet_get_settings);
780
781 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
782 {
783 struct usbnet *dev = netdev_priv(net);
784 int retval;
785
786 if (!dev->mii.mdio_write)
787 return -EOPNOTSUPP;
788
789 retval = mii_ethtool_sset(&dev->mii, cmd);
790
791 /* link speed/duplex might have changed */
792 if (dev->driver_info->link_reset)
793 dev->driver_info->link_reset(dev);
794
795 return retval;
796
797 }
798 EXPORT_SYMBOL_GPL(usbnet_set_settings);
799
800 u32 usbnet_get_link (struct net_device *net)
801 {
802 struct usbnet *dev = netdev_priv(net);
803
804 /* If a check_connect is defined, return its result */
805 if (dev->driver_info->check_connect)
806 return dev->driver_info->check_connect (dev) == 0;
807
808 /* if the device has mii operations, use those */
809 if (dev->mii.mdio_read)
810 return mii_link_ok(&dev->mii);
811
812 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
813 return ethtool_op_get_link(net);
814 }
815 EXPORT_SYMBOL_GPL(usbnet_get_link);
816
817 int usbnet_nway_reset(struct net_device *net)
818 {
819 struct usbnet *dev = netdev_priv(net);
820
821 if (!dev->mii.mdio_write)
822 return -EOPNOTSUPP;
823
824 return mii_nway_restart(&dev->mii);
825 }
826 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
827
828 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
829 {
830 struct usbnet *dev = netdev_priv(net);
831
832 strncpy (info->driver, dev->driver_name, sizeof info->driver);
833 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
834 strncpy (info->fw_version, dev->driver_info->description,
835 sizeof info->fw_version);
836 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
837 }
838 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
839
840 u32 usbnet_get_msglevel (struct net_device *net)
841 {
842 struct usbnet *dev = netdev_priv(net);
843
844 return dev->msg_enable;
845 }
846 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
847
848 void usbnet_set_msglevel (struct net_device *net, u32 level)
849 {
850 struct usbnet *dev = netdev_priv(net);
851
852 dev->msg_enable = level;
853 }
854 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
855
856 /* drivers may override default ethtool_ops in their bind() routine */
857 static const struct ethtool_ops usbnet_ethtool_ops = {
858 .get_settings = usbnet_get_settings,
859 .set_settings = usbnet_set_settings,
860 .get_link = usbnet_get_link,
861 .nway_reset = usbnet_nway_reset,
862 .get_drvinfo = usbnet_get_drvinfo,
863 .get_msglevel = usbnet_get_msglevel,
864 .set_msglevel = usbnet_set_msglevel,
865 };
866
867 /*-------------------------------------------------------------------------*/
868
869 /* work that cannot be done in interrupt context uses keventd.
870 *
871 * NOTE: with 2.5 we could do more of this using completion callbacks,
872 * especially now that control transfers can be queued.
873 */
874 static void
875 kevent (struct work_struct *work)
876 {
877 struct usbnet *dev =
878 container_of(work, struct usbnet, kevent);
879 int status;
880
881 /* usb_clear_halt() needs a thread context */
882 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
883 unlink_urbs (dev, &dev->txq);
884 status = usb_autopm_get_interface(dev->intf);
885 if (status < 0)
886 goto fail_pipe;
887 status = usb_clear_halt (dev->udev, dev->out);
888 usb_autopm_put_interface(dev->intf);
889 if (status < 0 &&
890 status != -EPIPE &&
891 status != -ESHUTDOWN) {
892 if (netif_msg_tx_err (dev))
893 fail_pipe:
894 netdev_err(dev->net, "can't clear tx halt, status %d\n",
895 status);
896 } else {
897 clear_bit (EVENT_TX_HALT, &dev->flags);
898 if (status != -ESHUTDOWN)
899 netif_wake_queue (dev->net);
900 }
901 }
902 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
903 unlink_urbs (dev, &dev->rxq);
904 status = usb_autopm_get_interface(dev->intf);
905 if (status < 0)
906 goto fail_halt;
907 status = usb_clear_halt (dev->udev, dev->in);
908 usb_autopm_put_interface(dev->intf);
909 if (status < 0 &&
910 status != -EPIPE &&
911 status != -ESHUTDOWN) {
912 if (netif_msg_rx_err (dev))
913 fail_halt:
914 netdev_err(dev->net, "can't clear rx halt, status %d\n",
915 status);
916 } else {
917 clear_bit (EVENT_RX_HALT, &dev->flags);
918 tasklet_schedule (&dev->bh);
919 }
920 }
921
922 /* tasklet could resubmit itself forever if memory is tight */
923 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
924 struct urb *urb = NULL;
925 int resched = 1;
926
927 if (netif_running (dev->net))
928 urb = usb_alloc_urb (0, GFP_KERNEL);
929 else
930 clear_bit (EVENT_RX_MEMORY, &dev->flags);
931 if (urb != NULL) {
932 clear_bit (EVENT_RX_MEMORY, &dev->flags);
933 status = usb_autopm_get_interface(dev->intf);
934 if (status < 0)
935 goto fail_lowmem;
936 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
937 resched = 0;
938 usb_autopm_put_interface(dev->intf);
939 fail_lowmem:
940 if (resched)
941 tasklet_schedule (&dev->bh);
942 }
943 }
944
945 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
946 struct driver_info *info = dev->driver_info;
947 int retval = 0;
948
949 clear_bit (EVENT_LINK_RESET, &dev->flags);
950 status = usb_autopm_get_interface(dev->intf);
951 if (status < 0)
952 goto skip_reset;
953 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
954 usb_autopm_put_interface(dev->intf);
955 skip_reset:
956 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
957 retval,
958 dev->udev->bus->bus_name,
959 dev->udev->devpath,
960 info->description);
961 } else {
962 usb_autopm_put_interface(dev->intf);
963 }
964 }
965
966 if (dev->flags)
967 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
968 }
969
970 /*-------------------------------------------------------------------------*/
971
972 static void tx_complete (struct urb *urb)
973 {
974 struct sk_buff *skb = (struct sk_buff *) urb->context;
975 struct skb_data *entry = (struct skb_data *) skb->cb;
976 struct usbnet *dev = entry->dev;
977
978 if (urb->status == 0) {
979 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
980 dev->net->stats.tx_packets++;
981 dev->net->stats.tx_bytes += entry->length;
982 } else {
983 dev->net->stats.tx_errors++;
984
985 switch (urb->status) {
986 case -EPIPE:
987 usbnet_defer_kevent (dev, EVENT_TX_HALT);
988 break;
989
990 /* software-driven interface shutdown */
991 case -ECONNRESET: // async unlink
992 case -ESHUTDOWN: // hardware gone
993 break;
994
995 // like rx, tx gets controller i/o faults during khubd delays
996 // and so it uses the same throttling mechanism.
997 case -EPROTO:
998 case -ETIME:
999 case -EILSEQ:
1000 usb_mark_last_busy(dev->udev);
1001 if (!timer_pending (&dev->delay)) {
1002 mod_timer (&dev->delay,
1003 jiffies + THROTTLE_JIFFIES);
1004 netif_dbg(dev, link, dev->net,
1005 "tx throttle %d\n", urb->status);
1006 }
1007 netif_stop_queue (dev->net);
1008 break;
1009 default:
1010 netif_dbg(dev, tx_err, dev->net,
1011 "tx err %d\n", entry->urb->status);
1012 break;
1013 }
1014 }
1015
1016 usb_autopm_put_interface_async(dev->intf);
1017 urb->dev = NULL;
1018 entry->state = tx_done;
1019 defer_bh(dev, skb, &dev->txq);
1020 }
1021
1022 /*-------------------------------------------------------------------------*/
1023
1024 void usbnet_tx_timeout (struct net_device *net)
1025 {
1026 struct usbnet *dev = netdev_priv(net);
1027
1028 unlink_urbs (dev, &dev->txq);
1029 tasklet_schedule (&dev->bh);
1030
1031 // FIXME: device recovery -- reset?
1032 }
1033 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1034
1035 /*-------------------------------------------------------------------------*/
1036
1037 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1038 struct net_device *net)
1039 {
1040 struct usbnet *dev = netdev_priv(net);
1041 int length;
1042 struct urb *urb = NULL;
1043 struct skb_data *entry;
1044 struct driver_info *info = dev->driver_info;
1045 unsigned long flags;
1046 int retval;
1047
1048 // some devices want funky USB-level framing, for
1049 // win32 driver (usually) and/or hardware quirks
1050 if (info->tx_fixup) {
1051 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1052 if (!skb) {
1053 if (netif_msg_tx_err(dev)) {
1054 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1055 goto drop;
1056 } else {
1057 /* cdc_ncm collected packet; waits for more */
1058 goto not_drop;
1059 }
1060 }
1061 }
1062 length = skb->len;
1063
1064 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1065 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1066 goto drop;
1067 }
1068
1069 entry = (struct skb_data *) skb->cb;
1070 entry->urb = urb;
1071 entry->dev = dev;
1072 entry->state = tx_start;
1073 entry->length = length;
1074
1075 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1076 skb->data, skb->len, tx_complete, skb);
1077
1078 /* don't assume the hardware handles USB_ZERO_PACKET
1079 * NOTE: strictly conforming cdc-ether devices should expect
1080 * the ZLP here, but ignore the one-byte packet.
1081 * NOTE2: CDC NCM specification is different from CDC ECM when
1082 * handling ZLP/short packets, so cdc_ncm driver will make short
1083 * packet itself if needed.
1084 */
1085 if (length % dev->maxpacket == 0) {
1086 if (!(info->flags & FLAG_SEND_ZLP)) {
1087 if (!(info->flags & FLAG_MULTI_PACKET)) {
1088 urb->transfer_buffer_length++;
1089 if (skb_tailroom(skb)) {
1090 skb->data[skb->len] = 0;
1091 __skb_put(skb, 1);
1092 }
1093 }
1094 } else
1095 urb->transfer_flags |= URB_ZERO_PACKET;
1096 }
1097
1098 spin_lock_irqsave(&dev->txq.lock, flags);
1099 retval = usb_autopm_get_interface_async(dev->intf);
1100 if (retval < 0) {
1101 spin_unlock_irqrestore(&dev->txq.lock, flags);
1102 goto drop;
1103 }
1104
1105 #ifdef CONFIG_PM
1106 /* if this triggers the device is still a sleep */
1107 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1108 /* transmission will be done in resume */
1109 usb_anchor_urb(urb, &dev->deferred);
1110 /* no use to process more packets */
1111 netif_stop_queue(net);
1112 spin_unlock_irqrestore(&dev->txq.lock, flags);
1113 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1114 goto deferred;
1115 }
1116 #endif
1117
1118 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1119 case -EPIPE:
1120 netif_stop_queue (net);
1121 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1122 usb_autopm_put_interface_async(dev->intf);
1123 break;
1124 default:
1125 usb_autopm_put_interface_async(dev->intf);
1126 netif_dbg(dev, tx_err, dev->net,
1127 "tx: submit urb err %d\n", retval);
1128 break;
1129 case 0:
1130 net->trans_start = jiffies;
1131 __skb_queue_tail (&dev->txq, skb);
1132 if (dev->txq.qlen >= TX_QLEN (dev))
1133 netif_stop_queue (net);
1134 }
1135 spin_unlock_irqrestore (&dev->txq.lock, flags);
1136
1137 if (retval) {
1138 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1139 drop:
1140 dev->net->stats.tx_dropped++;
1141 not_drop:
1142 if (skb)
1143 dev_kfree_skb_any (skb);
1144 usb_free_urb (urb);
1145 } else
1146 netif_dbg(dev, tx_queued, dev->net,
1147 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1148 #ifdef CONFIG_PM
1149 deferred:
1150 #endif
1151 return NETDEV_TX_OK;
1152 }
1153 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1154
1155 /*-------------------------------------------------------------------------*/
1156
1157 // tasklet (work deferred from completions, in_irq) or timer
1158
1159 static void usbnet_bh (unsigned long param)
1160 {
1161 struct usbnet *dev = (struct usbnet *) param;
1162 struct sk_buff *skb;
1163 struct skb_data *entry;
1164
1165 while ((skb = skb_dequeue (&dev->done))) {
1166 entry = (struct skb_data *) skb->cb;
1167 switch (entry->state) {
1168 case rx_done:
1169 entry->state = rx_cleanup;
1170 rx_process (dev, skb);
1171 continue;
1172 case tx_done:
1173 case rx_cleanup:
1174 usb_free_urb (entry->urb);
1175 dev_kfree_skb (skb);
1176 continue;
1177 default:
1178 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1179 }
1180 }
1181
1182 // waiting for all pending urbs to complete?
1183 if (dev->wait) {
1184 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1185 wake_up (dev->wait);
1186 }
1187
1188 // or are we maybe short a few urbs?
1189 } else if (netif_running (dev->net) &&
1190 netif_device_present (dev->net) &&
1191 !timer_pending (&dev->delay) &&
1192 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1193 int temp = dev->rxq.qlen;
1194 int qlen = RX_QLEN (dev);
1195
1196 if (temp < qlen) {
1197 struct urb *urb;
1198 int i;
1199
1200 // don't refill the queue all at once
1201 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1202 urb = usb_alloc_urb (0, GFP_ATOMIC);
1203 if (urb != NULL) {
1204 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1205 -ENOLINK)
1206 return;
1207 }
1208 }
1209 if (temp != dev->rxq.qlen)
1210 netif_dbg(dev, link, dev->net,
1211 "rxqlen %d --> %d\n",
1212 temp, dev->rxq.qlen);
1213 if (dev->rxq.qlen < qlen)
1214 tasklet_schedule (&dev->bh);
1215 }
1216 if (dev->txq.qlen < TX_QLEN (dev))
1217 netif_wake_queue (dev->net);
1218 }
1219 }
1220
1221
1222 /*-------------------------------------------------------------------------
1223 *
1224 * USB Device Driver support
1225 *
1226 *-------------------------------------------------------------------------*/
1227
1228 // precondition: never called in_interrupt
1229
1230 void usbnet_disconnect (struct usb_interface *intf)
1231 {
1232 struct usbnet *dev;
1233 struct usb_device *xdev;
1234 struct net_device *net;
1235
1236 dev = usb_get_intfdata(intf);
1237 usb_set_intfdata(intf, NULL);
1238 if (!dev)
1239 return;
1240
1241 xdev = interface_to_usbdev (intf);
1242
1243 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1244 intf->dev.driver->name,
1245 xdev->bus->bus_name, xdev->devpath,
1246 dev->driver_info->description);
1247
1248 net = dev->net;
1249 unregister_netdev (net);
1250
1251 cancel_work_sync(&dev->kevent);
1252
1253 if (dev->driver_info->unbind)
1254 dev->driver_info->unbind (dev, intf);
1255
1256 free_netdev(net);
1257 usb_put_dev (xdev);
1258 }
1259 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1260
1261 static const struct net_device_ops usbnet_netdev_ops = {
1262 .ndo_open = usbnet_open,
1263 .ndo_stop = usbnet_stop,
1264 .ndo_start_xmit = usbnet_start_xmit,
1265 .ndo_tx_timeout = usbnet_tx_timeout,
1266 .ndo_change_mtu = usbnet_change_mtu,
1267 .ndo_set_mac_address = eth_mac_addr,
1268 .ndo_validate_addr = eth_validate_addr,
1269 };
1270
1271 /*-------------------------------------------------------------------------*/
1272
1273 // precondition: never called in_interrupt
1274
1275 static struct device_type wlan_type = {
1276 .name = "wlan",
1277 };
1278
1279 static struct device_type wwan_type = {
1280 .name = "wwan",
1281 };
1282
1283 int
1284 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1285 {
1286 struct usbnet *dev;
1287 struct net_device *net;
1288 struct usb_host_interface *interface;
1289 struct driver_info *info;
1290 struct usb_device *xdev;
1291 int status;
1292 const char *name;
1293 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1294
1295 /* usbnet already took usb runtime pm, so have to enable the feature
1296 * for usb interface, otherwise usb_autopm_get_interface may return
1297 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1298 */
1299 if (!driver->supports_autosuspend) {
1300 driver->supports_autosuspend = 1;
1301 pm_runtime_enable(&udev->dev);
1302 }
1303
1304 name = udev->dev.driver->name;
1305 info = (struct driver_info *) prod->driver_info;
1306 if (!info) {
1307 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1308 return -ENODEV;
1309 }
1310 xdev = interface_to_usbdev (udev);
1311 interface = udev->cur_altsetting;
1312
1313 usb_get_dev (xdev);
1314
1315 status = -ENOMEM;
1316
1317 // set up our own records
1318 net = alloc_etherdev(sizeof(*dev));
1319 if (!net) {
1320 dbg ("can't kmalloc dev");
1321 goto out;
1322 }
1323
1324 /* netdev_printk() needs this so do it as early as possible */
1325 SET_NETDEV_DEV(net, &udev->dev);
1326
1327 dev = netdev_priv(net);
1328 dev->udev = xdev;
1329 dev->intf = udev;
1330 dev->driver_info = info;
1331 dev->driver_name = name;
1332 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1333 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1334 skb_queue_head_init (&dev->rxq);
1335 skb_queue_head_init (&dev->txq);
1336 skb_queue_head_init (&dev->done);
1337 skb_queue_head_init(&dev->rxq_pause);
1338 dev->bh.func = usbnet_bh;
1339 dev->bh.data = (unsigned long) dev;
1340 INIT_WORK (&dev->kevent, kevent);
1341 init_usb_anchor(&dev->deferred);
1342 dev->delay.function = usbnet_bh;
1343 dev->delay.data = (unsigned long) dev;
1344 init_timer (&dev->delay);
1345 mutex_init (&dev->phy_mutex);
1346
1347 dev->net = net;
1348 strcpy (net->name, "usb%d");
1349 memcpy (net->dev_addr, node_id, sizeof node_id);
1350
1351 /* rx and tx sides can use different message sizes;
1352 * bind() should set rx_urb_size in that case.
1353 */
1354 dev->hard_mtu = net->mtu + net->hard_header_len;
1355 #if 0
1356 // dma_supported() is deeply broken on almost all architectures
1357 // possible with some EHCI controllers
1358 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1359 net->features |= NETIF_F_HIGHDMA;
1360 #endif
1361
1362 net->netdev_ops = &usbnet_netdev_ops;
1363 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1364 net->ethtool_ops = &usbnet_ethtool_ops;
1365
1366 // allow device-specific bind/init procedures
1367 // NOTE net->name still not usable ...
1368 if (info->bind) {
1369 status = info->bind (dev, udev);
1370 if (status < 0)
1371 goto out1;
1372
1373 // heuristic: "usb%d" for links we know are two-host,
1374 // else "eth%d" when there's reasonable doubt. userspace
1375 // can rename the link if it knows better.
1376 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1377 (net->dev_addr [0] & 0x02) == 0)
1378 strcpy (net->name, "eth%d");
1379 /* WLAN devices should always be named "wlan%d" */
1380 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1381 strcpy(net->name, "wlan%d");
1382 /* WWAN devices should always be named "wwan%d" */
1383 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1384 strcpy(net->name, "wwan%d");
1385
1386 /* maybe the remote can't receive an Ethernet MTU */
1387 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1388 net->mtu = dev->hard_mtu - net->hard_header_len;
1389 } else if (!info->in || !info->out)
1390 status = usbnet_get_endpoints (dev, udev);
1391 else {
1392 dev->in = usb_rcvbulkpipe (xdev, info->in);
1393 dev->out = usb_sndbulkpipe (xdev, info->out);
1394 if (!(info->flags & FLAG_NO_SETINT))
1395 status = usb_set_interface (xdev,
1396 interface->desc.bInterfaceNumber,
1397 interface->desc.bAlternateSetting);
1398 else
1399 status = 0;
1400
1401 }
1402 if (status >= 0 && dev->status)
1403 status = init_status (dev, udev);
1404 if (status < 0)
1405 goto out3;
1406
1407 if (!dev->rx_urb_size)
1408 dev->rx_urb_size = dev->hard_mtu;
1409 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1410
1411 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1412 SET_NETDEV_DEVTYPE(net, &wlan_type);
1413 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1414 SET_NETDEV_DEVTYPE(net, &wwan_type);
1415
1416 status = register_netdev (net);
1417 if (status)
1418 goto out3;
1419 netif_info(dev, probe, dev->net,
1420 "register '%s' at usb-%s-%s, %s, %pM\n",
1421 udev->dev.driver->name,
1422 xdev->bus->bus_name, xdev->devpath,
1423 dev->driver_info->description,
1424 net->dev_addr);
1425
1426 // ok, it's ready to go.
1427 usb_set_intfdata (udev, dev);
1428
1429 netif_device_attach (net);
1430
1431 if (dev->driver_info->flags & FLAG_LINK_INTR)
1432 netif_carrier_off(net);
1433
1434 return 0;
1435
1436 out3:
1437 if (info->unbind)
1438 info->unbind (dev, udev);
1439 out1:
1440 free_netdev(net);
1441 out:
1442 usb_put_dev(xdev);
1443 return status;
1444 }
1445 EXPORT_SYMBOL_GPL(usbnet_probe);
1446
1447 /*-------------------------------------------------------------------------*/
1448
1449 /*
1450 * suspend the whole driver as soon as the first interface is suspended
1451 * resume only when the last interface is resumed
1452 */
1453
1454 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1455 {
1456 struct usbnet *dev = usb_get_intfdata(intf);
1457
1458 if (!dev->suspend_count++) {
1459 spin_lock_irq(&dev->txq.lock);
1460 /* don't autosuspend while transmitting */
1461 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1462 spin_unlock_irq(&dev->txq.lock);
1463 return -EBUSY;
1464 } else {
1465 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1466 spin_unlock_irq(&dev->txq.lock);
1467 }
1468 /*
1469 * accelerate emptying of the rx and queues, to avoid
1470 * having everything error out.
1471 */
1472 netif_device_detach (dev->net);
1473 usbnet_terminate_urbs(dev);
1474 usb_kill_urb(dev->interrupt);
1475
1476 /*
1477 * reattach so runtime management can use and
1478 * wake the device
1479 */
1480 netif_device_attach (dev->net);
1481 }
1482 return 0;
1483 }
1484 EXPORT_SYMBOL_GPL(usbnet_suspend);
1485
1486 int usbnet_resume (struct usb_interface *intf)
1487 {
1488 struct usbnet *dev = usb_get_intfdata(intf);
1489 struct sk_buff *skb;
1490 struct urb *res;
1491 int retval;
1492
1493 if (!--dev->suspend_count) {
1494 spin_lock_irq(&dev->txq.lock);
1495 while ((res = usb_get_from_anchor(&dev->deferred))) {
1496
1497 skb = (struct sk_buff *)res->context;
1498 retval = usb_submit_urb(res, GFP_ATOMIC);
1499 if (retval < 0) {
1500 dev_kfree_skb_any(skb);
1501 usb_free_urb(res);
1502 usb_autopm_put_interface_async(dev->intf);
1503 } else {
1504 dev->net->trans_start = jiffies;
1505 __skb_queue_tail(&dev->txq, skb);
1506 }
1507 }
1508
1509 smp_mb();
1510 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1511 spin_unlock_irq(&dev->txq.lock);
1512 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1513 netif_start_queue(dev->net);
1514 tasklet_schedule (&dev->bh);
1515 }
1516 return 0;
1517 }
1518 EXPORT_SYMBOL_GPL(usbnet_resume);
1519
1520
1521 /*-------------------------------------------------------------------------*/
1522
1523 static int __init usbnet_init(void)
1524 {
1525 /* compiler should optimize this out */
1526 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1527 < sizeof (struct skb_data));
1528
1529 random_ether_addr(node_id);
1530 return 0;
1531 }
1532 module_init(usbnet_init);
1533
1534 static void __exit usbnet_exit(void)
1535 {
1536 }
1537 module_exit(usbnet_exit);
1538
1539 MODULE_AUTHOR("David Brownell");
1540 MODULE_DESCRIPTION("USB network driver framework");
1541 MODULE_LICENSE("GPL");
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