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