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USBNET: support DMA SG
[deliverable/linux.git] / drivers / net / usb / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
49
50 #define DRIVER_VERSION "22-Aug-2005"
51
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
65 */
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
71
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
74
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
78
79 // between wakeups
80 #define UNLINK_TIMEOUT_MS 3
81
82 /*-------------------------------------------------------------------------*/
83
84 // randomly generated ethernet address
85 static u8 node_id [ETH_ALEN];
86
87 static const char driver_name [] = "usbnet";
88
89 /* use ethtool to change the level for any given device */
90 static int msg_level = -1;
91 module_param (msg_level, int, 0);
92 MODULE_PARM_DESC (msg_level, "Override default message level");
93
94 /*-------------------------------------------------------------------------*/
95
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
98 {
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsettings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
130 if (usb_endpoint_dir_in(&e->desc)) {
131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
153
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160 }
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
162
163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164 {
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
179 return 0;
180 }
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
183 static void intr_complete (struct urb *urb)
184 {
185 struct usbnet *dev = urb->context;
186 int status = urb->status;
187
188 switch (status) {
189 /* success */
190 case 0:
191 dev->driver_info->status(dev, urb);
192 break;
193
194 /* software-driven interface shutdown */
195 case -ENOENT: /* urb killed */
196 case -ESHUTDOWN: /* hardware gone */
197 netif_dbg(dev, ifdown, dev->net,
198 "intr shutdown, code %d\n", status);
199 return;
200
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
203 */
204 default:
205 netdev_dbg(dev->net, "intr status %d\n", status);
206 break;
207 }
208
209 if (!netif_running (dev->net))
210 return;
211
212 status = usb_submit_urb (urb, GFP_ATOMIC);
213 if (status != 0)
214 netif_err(dev, timer, dev->net,
215 "intr resubmit --> %d\n", status);
216 }
217
218 static int init_status (struct usbnet *dev, struct usb_interface *intf)
219 {
220 char *buf = NULL;
221 unsigned pipe = 0;
222 unsigned maxp;
223 unsigned period;
224
225 if (!dev->driver_info->status)
226 return 0;
227
228 pipe = usb_rcvintpipe (dev->udev,
229 dev->status->desc.bEndpointAddress
230 & USB_ENDPOINT_NUMBER_MASK);
231 maxp = usb_maxpacket (dev->udev, pipe, 0);
232
233 /* avoid 1 msec chatter: min 8 msec poll rate */
234 period = max ((int) dev->status->desc.bInterval,
235 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
236
237 buf = kmalloc (maxp, GFP_KERNEL);
238 if (buf) {
239 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
240 if (!dev->interrupt) {
241 kfree (buf);
242 return -ENOMEM;
243 } else {
244 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
245 buf, maxp, intr_complete, dev, period);
246 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
247 dev_dbg(&intf->dev,
248 "status ep%din, %d bytes period %d\n",
249 usb_pipeendpoint(pipe), maxp, period);
250 }
251 }
252 return 0;
253 }
254
255 /* Submit the interrupt URB if not previously submitted, increasing refcount */
256 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
257 {
258 int ret = 0;
259
260 WARN_ON_ONCE(dev->interrupt == NULL);
261 if (dev->interrupt) {
262 mutex_lock(&dev->interrupt_mutex);
263
264 if (++dev->interrupt_count == 1)
265 ret = usb_submit_urb(dev->interrupt, mem_flags);
266
267 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
268 dev->interrupt_count);
269 mutex_unlock(&dev->interrupt_mutex);
270 }
271 return ret;
272 }
273 EXPORT_SYMBOL_GPL(usbnet_status_start);
274
275 /* For resume; submit interrupt URB if previously submitted */
276 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
277 {
278 int ret = 0;
279
280 mutex_lock(&dev->interrupt_mutex);
281 if (dev->interrupt_count) {
282 ret = usb_submit_urb(dev->interrupt, mem_flags);
283 dev_dbg(&dev->udev->dev,
284 "submitted interrupt URB for resume\n");
285 }
286 mutex_unlock(&dev->interrupt_mutex);
287 return ret;
288 }
289
290 /* Kill the interrupt URB if all submitters want it killed */
291 void usbnet_status_stop(struct usbnet *dev)
292 {
293 if (dev->interrupt) {
294 mutex_lock(&dev->interrupt_mutex);
295 WARN_ON(dev->interrupt_count == 0);
296
297 if (dev->interrupt_count && --dev->interrupt_count == 0)
298 usb_kill_urb(dev->interrupt);
299
300 dev_dbg(&dev->udev->dev,
301 "decremented interrupt URB count to %d\n",
302 dev->interrupt_count);
303 mutex_unlock(&dev->interrupt_mutex);
304 }
305 }
306 EXPORT_SYMBOL_GPL(usbnet_status_stop);
307
308 /* For suspend; always kill interrupt URB */
309 static void __usbnet_status_stop_force(struct usbnet *dev)
310 {
311 if (dev->interrupt) {
312 mutex_lock(&dev->interrupt_mutex);
313 usb_kill_urb(dev->interrupt);
314 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
315 mutex_unlock(&dev->interrupt_mutex);
316 }
317 }
318
319 /* Passes this packet up the stack, updating its accounting.
320 * Some link protocols batch packets, so their rx_fixup paths
321 * can return clones as well as just modify the original skb.
322 */
323 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
324 {
325 int status;
326
327 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
328 skb_queue_tail(&dev->rxq_pause, skb);
329 return;
330 }
331
332 skb->protocol = eth_type_trans (skb, dev->net);
333 dev->net->stats.rx_packets++;
334 dev->net->stats.rx_bytes += skb->len;
335
336 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
337 skb->len + sizeof (struct ethhdr), skb->protocol);
338 memset (skb->cb, 0, sizeof (struct skb_data));
339
340 if (skb_defer_rx_timestamp(skb))
341 return;
342
343 status = netif_rx (skb);
344 if (status != NET_RX_SUCCESS)
345 netif_dbg(dev, rx_err, dev->net,
346 "netif_rx status %d\n", status);
347 }
348 EXPORT_SYMBOL_GPL(usbnet_skb_return);
349
350 \f
351 /*-------------------------------------------------------------------------
352 *
353 * Network Device Driver (peer link to "Host Device", from USB host)
354 *
355 *-------------------------------------------------------------------------*/
356
357 int usbnet_change_mtu (struct net_device *net, int new_mtu)
358 {
359 struct usbnet *dev = netdev_priv(net);
360 int ll_mtu = new_mtu + net->hard_header_len;
361 int old_hard_mtu = dev->hard_mtu;
362 int old_rx_urb_size = dev->rx_urb_size;
363
364 if (new_mtu <= 0)
365 return -EINVAL;
366 // no second zero-length packet read wanted after mtu-sized packets
367 if ((ll_mtu % dev->maxpacket) == 0)
368 return -EDOM;
369 net->mtu = new_mtu;
370
371 dev->hard_mtu = net->mtu + net->hard_header_len;
372 if (dev->rx_urb_size == old_hard_mtu) {
373 dev->rx_urb_size = dev->hard_mtu;
374 if (dev->rx_urb_size > old_rx_urb_size)
375 usbnet_unlink_rx_urbs(dev);
376 }
377
378 return 0;
379 }
380 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
381
382 /* The caller must hold list->lock */
383 static void __usbnet_queue_skb(struct sk_buff_head *list,
384 struct sk_buff *newsk, enum skb_state state)
385 {
386 struct skb_data *entry = (struct skb_data *) newsk->cb;
387
388 __skb_queue_tail(list, newsk);
389 entry->state = state;
390 }
391
392 /*-------------------------------------------------------------------------*/
393
394 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
395 * completion callbacks. 2.5 should have fixed those bugs...
396 */
397
398 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
399 struct sk_buff_head *list, enum skb_state state)
400 {
401 unsigned long flags;
402 enum skb_state old_state;
403 struct skb_data *entry = (struct skb_data *) skb->cb;
404
405 spin_lock_irqsave(&list->lock, flags);
406 old_state = entry->state;
407 entry->state = state;
408 __skb_unlink(skb, list);
409 spin_unlock(&list->lock);
410 spin_lock(&dev->done.lock);
411 __skb_queue_tail(&dev->done, skb);
412 if (dev->done.qlen == 1)
413 tasklet_schedule(&dev->bh);
414 spin_unlock_irqrestore(&dev->done.lock, flags);
415 return old_state;
416 }
417
418 /* some work can't be done in tasklets, so we use keventd
419 *
420 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
421 * but tasklet_schedule() doesn't. hope the failure is rare.
422 */
423 void usbnet_defer_kevent (struct usbnet *dev, int work)
424 {
425 set_bit (work, &dev->flags);
426 if (!schedule_work (&dev->kevent)) {
427 if (net_ratelimit())
428 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
429 } else {
430 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
431 }
432 }
433 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
434
435 /*-------------------------------------------------------------------------*/
436
437 static void rx_complete (struct urb *urb);
438
439 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
440 {
441 struct sk_buff *skb;
442 struct skb_data *entry;
443 int retval = 0;
444 unsigned long lockflags;
445 size_t size = dev->rx_urb_size;
446
447 /* prevent rx skb allocation when error ratio is high */
448 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
449 usb_free_urb(urb);
450 return -ENOLINK;
451 }
452
453 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
454 if (!skb) {
455 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
456 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
457 usb_free_urb (urb);
458 return -ENOMEM;
459 }
460
461 entry = (struct skb_data *) skb->cb;
462 entry->urb = urb;
463 entry->dev = dev;
464 entry->length = 0;
465
466 usb_fill_bulk_urb (urb, dev->udev, dev->in,
467 skb->data, size, rx_complete, skb);
468
469 spin_lock_irqsave (&dev->rxq.lock, lockflags);
470
471 if (netif_running (dev->net) &&
472 netif_device_present (dev->net) &&
473 !test_bit (EVENT_RX_HALT, &dev->flags) &&
474 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
475 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
476 case -EPIPE:
477 usbnet_defer_kevent (dev, EVENT_RX_HALT);
478 break;
479 case -ENOMEM:
480 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
481 break;
482 case -ENODEV:
483 netif_dbg(dev, ifdown, dev->net, "device gone\n");
484 netif_device_detach (dev->net);
485 break;
486 case -EHOSTUNREACH:
487 retval = -ENOLINK;
488 break;
489 default:
490 netif_dbg(dev, rx_err, dev->net,
491 "rx submit, %d\n", retval);
492 tasklet_schedule (&dev->bh);
493 break;
494 case 0:
495 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
496 }
497 } else {
498 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
499 retval = -ENOLINK;
500 }
501 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
502 if (retval) {
503 dev_kfree_skb_any (skb);
504 usb_free_urb (urb);
505 }
506 return retval;
507 }
508
509
510 /*-------------------------------------------------------------------------*/
511
512 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
513 {
514 if (dev->driver_info->rx_fixup &&
515 !dev->driver_info->rx_fixup (dev, skb)) {
516 /* With RX_ASSEMBLE, rx_fixup() must update counters */
517 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
518 dev->net->stats.rx_errors++;
519 goto done;
520 }
521 // else network stack removes extra byte if we forced a short packet
522
523 if (skb->len) {
524 /* all data was already cloned from skb inside the driver */
525 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
526 dev_kfree_skb_any(skb);
527 else
528 usbnet_skb_return(dev, skb);
529 return;
530 }
531
532 netif_dbg(dev, rx_err, dev->net, "drop\n");
533 dev->net->stats.rx_errors++;
534 done:
535 skb_queue_tail(&dev->done, skb);
536 }
537
538 /*-------------------------------------------------------------------------*/
539
540 static void rx_complete (struct urb *urb)
541 {
542 struct sk_buff *skb = (struct sk_buff *) urb->context;
543 struct skb_data *entry = (struct skb_data *) skb->cb;
544 struct usbnet *dev = entry->dev;
545 int urb_status = urb->status;
546 enum skb_state state;
547
548 skb_put (skb, urb->actual_length);
549 state = rx_done;
550 entry->urb = NULL;
551
552 switch (urb_status) {
553 /* success */
554 case 0:
555 if (skb->len < dev->net->hard_header_len) {
556 state = rx_cleanup;
557 dev->net->stats.rx_errors++;
558 dev->net->stats.rx_length_errors++;
559 netif_dbg(dev, rx_err, dev->net,
560 "rx length %d\n", skb->len);
561 }
562 break;
563
564 /* stalls need manual reset. this is rare ... except that
565 * when going through USB 2.0 TTs, unplug appears this way.
566 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
567 * storm, recovering as needed.
568 */
569 case -EPIPE:
570 dev->net->stats.rx_errors++;
571 usbnet_defer_kevent (dev, EVENT_RX_HALT);
572 // FALLTHROUGH
573
574 /* software-driven interface shutdown */
575 case -ECONNRESET: /* async unlink */
576 case -ESHUTDOWN: /* hardware gone */
577 netif_dbg(dev, ifdown, dev->net,
578 "rx shutdown, code %d\n", urb_status);
579 goto block;
580
581 /* we get controller i/o faults during khubd disconnect() delays.
582 * throttle down resubmits, to avoid log floods; just temporarily,
583 * so we still recover when the fault isn't a khubd delay.
584 */
585 case -EPROTO:
586 case -ETIME:
587 case -EILSEQ:
588 dev->net->stats.rx_errors++;
589 if (!timer_pending (&dev->delay)) {
590 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
591 netif_dbg(dev, link, dev->net,
592 "rx throttle %d\n", urb_status);
593 }
594 block:
595 state = rx_cleanup;
596 entry->urb = urb;
597 urb = NULL;
598 break;
599
600 /* data overrun ... flush fifo? */
601 case -EOVERFLOW:
602 dev->net->stats.rx_over_errors++;
603 // FALLTHROUGH
604
605 default:
606 state = rx_cleanup;
607 dev->net->stats.rx_errors++;
608 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
609 break;
610 }
611
612 /* stop rx if packet error rate is high */
613 if (++dev->pkt_cnt > 30) {
614 dev->pkt_cnt = 0;
615 dev->pkt_err = 0;
616 } else {
617 if (state == rx_cleanup)
618 dev->pkt_err++;
619 if (dev->pkt_err > 20)
620 set_bit(EVENT_RX_KILL, &dev->flags);
621 }
622
623 state = defer_bh(dev, skb, &dev->rxq, state);
624
625 if (urb) {
626 if (netif_running (dev->net) &&
627 !test_bit (EVENT_RX_HALT, &dev->flags) &&
628 state != unlink_start) {
629 rx_submit (dev, urb, GFP_ATOMIC);
630 usb_mark_last_busy(dev->udev);
631 return;
632 }
633 usb_free_urb (urb);
634 }
635 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
636 }
637
638 /*-------------------------------------------------------------------------*/
639 void usbnet_pause_rx(struct usbnet *dev)
640 {
641 set_bit(EVENT_RX_PAUSED, &dev->flags);
642
643 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
644 }
645 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
646
647 void usbnet_resume_rx(struct usbnet *dev)
648 {
649 struct sk_buff *skb;
650 int num = 0;
651
652 clear_bit(EVENT_RX_PAUSED, &dev->flags);
653
654 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
655 usbnet_skb_return(dev, skb);
656 num++;
657 }
658
659 tasklet_schedule(&dev->bh);
660
661 netif_dbg(dev, rx_status, dev->net,
662 "paused rx queue disabled, %d skbs requeued\n", num);
663 }
664 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
665
666 void usbnet_purge_paused_rxq(struct usbnet *dev)
667 {
668 skb_queue_purge(&dev->rxq_pause);
669 }
670 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
671
672 /*-------------------------------------------------------------------------*/
673
674 // unlink pending rx/tx; completion handlers do all other cleanup
675
676 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
677 {
678 unsigned long flags;
679 struct sk_buff *skb;
680 int count = 0;
681
682 spin_lock_irqsave (&q->lock, flags);
683 while (!skb_queue_empty(q)) {
684 struct skb_data *entry;
685 struct urb *urb;
686 int retval;
687
688 skb_queue_walk(q, skb) {
689 entry = (struct skb_data *) skb->cb;
690 if (entry->state != unlink_start)
691 goto found;
692 }
693 break;
694 found:
695 entry->state = unlink_start;
696 urb = entry->urb;
697
698 /*
699 * Get reference count of the URB to avoid it to be
700 * freed during usb_unlink_urb, which may trigger
701 * use-after-free problem inside usb_unlink_urb since
702 * usb_unlink_urb is always racing with .complete
703 * handler(include defer_bh).
704 */
705 usb_get_urb(urb);
706 spin_unlock_irqrestore(&q->lock, flags);
707 // during some PM-driven resume scenarios,
708 // these (async) unlinks complete immediately
709 retval = usb_unlink_urb (urb);
710 if (retval != -EINPROGRESS && retval != 0)
711 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
712 else
713 count++;
714 usb_put_urb(urb);
715 spin_lock_irqsave(&q->lock, flags);
716 }
717 spin_unlock_irqrestore (&q->lock, flags);
718 return count;
719 }
720
721 // Flush all pending rx urbs
722 // minidrivers may need to do this when the MTU changes
723
724 void usbnet_unlink_rx_urbs(struct usbnet *dev)
725 {
726 if (netif_running(dev->net)) {
727 (void) unlink_urbs (dev, &dev->rxq);
728 tasklet_schedule(&dev->bh);
729 }
730 }
731 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
732
733 /*-------------------------------------------------------------------------*/
734
735 // precondition: never called in_interrupt
736 static void usbnet_terminate_urbs(struct usbnet *dev)
737 {
738 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
739 DECLARE_WAITQUEUE(wait, current);
740 int temp;
741
742 /* ensure there are no more active urbs */
743 add_wait_queue(&unlink_wakeup, &wait);
744 set_current_state(TASK_UNINTERRUPTIBLE);
745 dev->wait = &unlink_wakeup;
746 temp = unlink_urbs(dev, &dev->txq) +
747 unlink_urbs(dev, &dev->rxq);
748
749 /* maybe wait for deletions to finish. */
750 while (!skb_queue_empty(&dev->rxq)
751 && !skb_queue_empty(&dev->txq)
752 && !skb_queue_empty(&dev->done)) {
753 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
754 set_current_state(TASK_UNINTERRUPTIBLE);
755 netif_dbg(dev, ifdown, dev->net,
756 "waited for %d urb completions\n", temp);
757 }
758 set_current_state(TASK_RUNNING);
759 dev->wait = NULL;
760 remove_wait_queue(&unlink_wakeup, &wait);
761 }
762
763 int usbnet_stop (struct net_device *net)
764 {
765 struct usbnet *dev = netdev_priv(net);
766 struct driver_info *info = dev->driver_info;
767 int retval;
768
769 clear_bit(EVENT_DEV_OPEN, &dev->flags);
770 netif_stop_queue (net);
771
772 netif_info(dev, ifdown, dev->net,
773 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
774 net->stats.rx_packets, net->stats.tx_packets,
775 net->stats.rx_errors, net->stats.tx_errors);
776
777 /* allow minidriver to stop correctly (wireless devices to turn off
778 * radio etc) */
779 if (info->stop) {
780 retval = info->stop(dev);
781 if (retval < 0)
782 netif_info(dev, ifdown, dev->net,
783 "stop fail (%d) usbnet usb-%s-%s, %s\n",
784 retval,
785 dev->udev->bus->bus_name, dev->udev->devpath,
786 info->description);
787 }
788
789 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
790 usbnet_terminate_urbs(dev);
791
792 usbnet_status_stop(dev);
793
794 usbnet_purge_paused_rxq(dev);
795
796 /* deferred work (task, timer, softirq) must also stop.
797 * can't flush_scheduled_work() until we drop rtnl (later),
798 * else workers could deadlock; so make workers a NOP.
799 */
800 dev->flags = 0;
801 del_timer_sync (&dev->delay);
802 tasklet_kill (&dev->bh);
803 if (info->manage_power &&
804 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
805 info->manage_power(dev, 0);
806 else
807 usb_autopm_put_interface(dev->intf);
808
809 return 0;
810 }
811 EXPORT_SYMBOL_GPL(usbnet_stop);
812
813 /*-------------------------------------------------------------------------*/
814
815 // posts reads, and enables write queuing
816
817 // precondition: never called in_interrupt
818
819 int usbnet_open (struct net_device *net)
820 {
821 struct usbnet *dev = netdev_priv(net);
822 int retval;
823 struct driver_info *info = dev->driver_info;
824
825 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
826 netif_info(dev, ifup, dev->net,
827 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
828 retval,
829 dev->udev->bus->bus_name,
830 dev->udev->devpath,
831 info->description);
832 goto done_nopm;
833 }
834
835 // put into "known safe" state
836 if (info->reset && (retval = info->reset (dev)) < 0) {
837 netif_info(dev, ifup, dev->net,
838 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
839 retval,
840 dev->udev->bus->bus_name,
841 dev->udev->devpath,
842 info->description);
843 goto done;
844 }
845
846 // insist peer be connected
847 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
848 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
849 goto done;
850 }
851
852 /* start any status interrupt transfer */
853 if (dev->interrupt) {
854 retval = usbnet_status_start(dev, GFP_KERNEL);
855 if (retval < 0) {
856 netif_err(dev, ifup, dev->net,
857 "intr submit %d\n", retval);
858 goto done;
859 }
860 }
861
862 set_bit(EVENT_DEV_OPEN, &dev->flags);
863 netif_start_queue (net);
864 netif_info(dev, ifup, dev->net,
865 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
866 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
867 dev->net->mtu,
868 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
869 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
870 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
871 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
872 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
873 "simple");
874
875 /* reset rx error state */
876 dev->pkt_cnt = 0;
877 dev->pkt_err = 0;
878 clear_bit(EVENT_RX_KILL, &dev->flags);
879
880 // delay posting reads until we're fully open
881 tasklet_schedule (&dev->bh);
882 if (info->manage_power) {
883 retval = info->manage_power(dev, 1);
884 if (retval < 0) {
885 retval = 0;
886 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
887 } else {
888 usb_autopm_put_interface(dev->intf);
889 }
890 }
891 return retval;
892 done:
893 usb_autopm_put_interface(dev->intf);
894 done_nopm:
895 return retval;
896 }
897 EXPORT_SYMBOL_GPL(usbnet_open);
898
899 /*-------------------------------------------------------------------------*/
900
901 /* ethtool methods; minidrivers may need to add some more, but
902 * they'll probably want to use this base set.
903 */
904
905 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
906 {
907 struct usbnet *dev = netdev_priv(net);
908
909 if (!dev->mii.mdio_read)
910 return -EOPNOTSUPP;
911
912 return mii_ethtool_gset(&dev->mii, cmd);
913 }
914 EXPORT_SYMBOL_GPL(usbnet_get_settings);
915
916 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
917 {
918 struct usbnet *dev = netdev_priv(net);
919 int retval;
920
921 if (!dev->mii.mdio_write)
922 return -EOPNOTSUPP;
923
924 retval = mii_ethtool_sset(&dev->mii, cmd);
925
926 /* link speed/duplex might have changed */
927 if (dev->driver_info->link_reset)
928 dev->driver_info->link_reset(dev);
929
930 return retval;
931
932 }
933 EXPORT_SYMBOL_GPL(usbnet_set_settings);
934
935 u32 usbnet_get_link (struct net_device *net)
936 {
937 struct usbnet *dev = netdev_priv(net);
938
939 /* If a check_connect is defined, return its result */
940 if (dev->driver_info->check_connect)
941 return dev->driver_info->check_connect (dev) == 0;
942
943 /* if the device has mii operations, use those */
944 if (dev->mii.mdio_read)
945 return mii_link_ok(&dev->mii);
946
947 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
948 return ethtool_op_get_link(net);
949 }
950 EXPORT_SYMBOL_GPL(usbnet_get_link);
951
952 int usbnet_nway_reset(struct net_device *net)
953 {
954 struct usbnet *dev = netdev_priv(net);
955
956 if (!dev->mii.mdio_write)
957 return -EOPNOTSUPP;
958
959 return mii_nway_restart(&dev->mii);
960 }
961 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
962
963 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
964 {
965 struct usbnet *dev = netdev_priv(net);
966
967 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
968 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
969 strlcpy (info->fw_version, dev->driver_info->description,
970 sizeof info->fw_version);
971 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
972 }
973 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
974
975 u32 usbnet_get_msglevel (struct net_device *net)
976 {
977 struct usbnet *dev = netdev_priv(net);
978
979 return dev->msg_enable;
980 }
981 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
982
983 void usbnet_set_msglevel (struct net_device *net, u32 level)
984 {
985 struct usbnet *dev = netdev_priv(net);
986
987 dev->msg_enable = level;
988 }
989 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
990
991 /* drivers may override default ethtool_ops in their bind() routine */
992 static const struct ethtool_ops usbnet_ethtool_ops = {
993 .get_settings = usbnet_get_settings,
994 .set_settings = usbnet_set_settings,
995 .get_link = usbnet_get_link,
996 .nway_reset = usbnet_nway_reset,
997 .get_drvinfo = usbnet_get_drvinfo,
998 .get_msglevel = usbnet_get_msglevel,
999 .set_msglevel = usbnet_set_msglevel,
1000 .get_ts_info = ethtool_op_get_ts_info,
1001 };
1002
1003 /*-------------------------------------------------------------------------*/
1004
1005 static void __handle_link_change(struct usbnet *dev)
1006 {
1007 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1008 return;
1009
1010 if (!netif_carrier_ok(dev->net)) {
1011 /* kill URBs for reading packets to save bus bandwidth */
1012 unlink_urbs(dev, &dev->rxq);
1013
1014 /*
1015 * tx_timeout will unlink URBs for sending packets and
1016 * tx queue is stopped by netcore after link becomes off
1017 */
1018 } else {
1019 /* submitting URBs for reading packets */
1020 tasklet_schedule(&dev->bh);
1021 }
1022
1023 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1024 }
1025
1026 /* work that cannot be done in interrupt context uses keventd.
1027 *
1028 * NOTE: with 2.5 we could do more of this using completion callbacks,
1029 * especially now that control transfers can be queued.
1030 */
1031 static void
1032 kevent (struct work_struct *work)
1033 {
1034 struct usbnet *dev =
1035 container_of(work, struct usbnet, kevent);
1036 int status;
1037
1038 /* usb_clear_halt() needs a thread context */
1039 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1040 unlink_urbs (dev, &dev->txq);
1041 status = usb_autopm_get_interface(dev->intf);
1042 if (status < 0)
1043 goto fail_pipe;
1044 status = usb_clear_halt (dev->udev, dev->out);
1045 usb_autopm_put_interface(dev->intf);
1046 if (status < 0 &&
1047 status != -EPIPE &&
1048 status != -ESHUTDOWN) {
1049 if (netif_msg_tx_err (dev))
1050 fail_pipe:
1051 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1052 status);
1053 } else {
1054 clear_bit (EVENT_TX_HALT, &dev->flags);
1055 if (status != -ESHUTDOWN)
1056 netif_wake_queue (dev->net);
1057 }
1058 }
1059 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1060 unlink_urbs (dev, &dev->rxq);
1061 status = usb_autopm_get_interface(dev->intf);
1062 if (status < 0)
1063 goto fail_halt;
1064 status = usb_clear_halt (dev->udev, dev->in);
1065 usb_autopm_put_interface(dev->intf);
1066 if (status < 0 &&
1067 status != -EPIPE &&
1068 status != -ESHUTDOWN) {
1069 if (netif_msg_rx_err (dev))
1070 fail_halt:
1071 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1072 status);
1073 } else {
1074 clear_bit (EVENT_RX_HALT, &dev->flags);
1075 tasklet_schedule (&dev->bh);
1076 }
1077 }
1078
1079 /* tasklet could resubmit itself forever if memory is tight */
1080 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1081 struct urb *urb = NULL;
1082 int resched = 1;
1083
1084 if (netif_running (dev->net))
1085 urb = usb_alloc_urb (0, GFP_KERNEL);
1086 else
1087 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1088 if (urb != NULL) {
1089 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1090 status = usb_autopm_get_interface(dev->intf);
1091 if (status < 0) {
1092 usb_free_urb(urb);
1093 goto fail_lowmem;
1094 }
1095 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1096 resched = 0;
1097 usb_autopm_put_interface(dev->intf);
1098 fail_lowmem:
1099 if (resched)
1100 tasklet_schedule (&dev->bh);
1101 }
1102 }
1103
1104 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1105 struct driver_info *info = dev->driver_info;
1106 int retval = 0;
1107
1108 clear_bit (EVENT_LINK_RESET, &dev->flags);
1109 status = usb_autopm_get_interface(dev->intf);
1110 if (status < 0)
1111 goto skip_reset;
1112 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1113 usb_autopm_put_interface(dev->intf);
1114 skip_reset:
1115 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1116 retval,
1117 dev->udev->bus->bus_name,
1118 dev->udev->devpath,
1119 info->description);
1120 } else {
1121 usb_autopm_put_interface(dev->intf);
1122 }
1123
1124 /* handle link change from link resetting */
1125 __handle_link_change(dev);
1126 }
1127
1128 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1129 __handle_link_change(dev);
1130
1131 if (dev->flags)
1132 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1133 }
1134
1135 /*-------------------------------------------------------------------------*/
1136
1137 static void tx_complete (struct urb *urb)
1138 {
1139 struct sk_buff *skb = (struct sk_buff *) urb->context;
1140 struct skb_data *entry = (struct skb_data *) skb->cb;
1141 struct usbnet *dev = entry->dev;
1142
1143 if (urb->status == 0) {
1144 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1145 dev->net->stats.tx_packets++;
1146 dev->net->stats.tx_bytes += entry->length;
1147 } else {
1148 dev->net->stats.tx_errors++;
1149
1150 switch (urb->status) {
1151 case -EPIPE:
1152 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1153 break;
1154
1155 /* software-driven interface shutdown */
1156 case -ECONNRESET: // async unlink
1157 case -ESHUTDOWN: // hardware gone
1158 break;
1159
1160 // like rx, tx gets controller i/o faults during khubd delays
1161 // and so it uses the same throttling mechanism.
1162 case -EPROTO:
1163 case -ETIME:
1164 case -EILSEQ:
1165 usb_mark_last_busy(dev->udev);
1166 if (!timer_pending (&dev->delay)) {
1167 mod_timer (&dev->delay,
1168 jiffies + THROTTLE_JIFFIES);
1169 netif_dbg(dev, link, dev->net,
1170 "tx throttle %d\n", urb->status);
1171 }
1172 netif_stop_queue (dev->net);
1173 break;
1174 default:
1175 netif_dbg(dev, tx_err, dev->net,
1176 "tx err %d\n", entry->urb->status);
1177 break;
1178 }
1179 }
1180
1181 usb_autopm_put_interface_async(dev->intf);
1182 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1183 }
1184
1185 /*-------------------------------------------------------------------------*/
1186
1187 void usbnet_tx_timeout (struct net_device *net)
1188 {
1189 struct usbnet *dev = netdev_priv(net);
1190
1191 unlink_urbs (dev, &dev->txq);
1192 tasklet_schedule (&dev->bh);
1193
1194 // FIXME: device recovery -- reset?
1195 }
1196 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1197
1198 /*-------------------------------------------------------------------------*/
1199
1200 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1201 {
1202 unsigned num_sgs, total_len = 0;
1203 int i, s = 0;
1204
1205 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1206 if (num_sgs == 1)
1207 return 0;
1208
1209 urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist), GFP_ATOMIC);
1210 if (!urb->sg)
1211 return -ENOMEM;
1212
1213 urb->num_sgs = num_sgs;
1214 sg_init_table(urb->sg, urb->num_sgs);
1215
1216 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1217 total_len += skb_headlen(skb);
1218
1219 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1220 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1221
1222 total_len += skb_frag_size(f);
1223 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1224 f->page_offset);
1225 }
1226 urb->transfer_buffer_length = total_len;
1227
1228 return 1;
1229 }
1230
1231 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1232 struct net_device *net)
1233 {
1234 struct usbnet *dev = netdev_priv(net);
1235 int length;
1236 struct urb *urb = NULL;
1237 struct skb_data *entry;
1238 struct driver_info *info = dev->driver_info;
1239 unsigned long flags;
1240 int retval;
1241
1242 if (skb)
1243 skb_tx_timestamp(skb);
1244
1245 // some devices want funky USB-level framing, for
1246 // win32 driver (usually) and/or hardware quirks
1247 if (info->tx_fixup) {
1248 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1249 if (!skb) {
1250 /* packet collected; minidriver waiting for more */
1251 if (info->flags & FLAG_MULTI_PACKET)
1252 goto not_drop;
1253 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1254 goto drop;
1255 }
1256 }
1257
1258 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1259 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1260 goto drop;
1261 }
1262
1263 entry = (struct skb_data *) skb->cb;
1264 entry->urb = urb;
1265 entry->dev = dev;
1266
1267 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1268 skb->data, skb->len, tx_complete, skb);
1269 if (dev->can_dma_sg) {
1270 if (build_dma_sg(skb, urb) < 0)
1271 goto drop;
1272 }
1273 entry->length = length = urb->transfer_buffer_length;
1274
1275 /* don't assume the hardware handles USB_ZERO_PACKET
1276 * NOTE: strictly conforming cdc-ether devices should expect
1277 * the ZLP here, but ignore the one-byte packet.
1278 * NOTE2: CDC NCM specification is different from CDC ECM when
1279 * handling ZLP/short packets, so cdc_ncm driver will make short
1280 * packet itself if needed.
1281 */
1282 if (length % dev->maxpacket == 0) {
1283 if (!(info->flags & FLAG_SEND_ZLP)) {
1284 if (!(info->flags & FLAG_MULTI_PACKET)) {
1285 urb->transfer_buffer_length++;
1286 if (skb_tailroom(skb)) {
1287 skb->data[skb->len] = 0;
1288 __skb_put(skb, 1);
1289 }
1290 }
1291 } else
1292 urb->transfer_flags |= URB_ZERO_PACKET;
1293 }
1294
1295 spin_lock_irqsave(&dev->txq.lock, flags);
1296 retval = usb_autopm_get_interface_async(dev->intf);
1297 if (retval < 0) {
1298 spin_unlock_irqrestore(&dev->txq.lock, flags);
1299 goto drop;
1300 }
1301
1302 #ifdef CONFIG_PM
1303 /* if this triggers the device is still a sleep */
1304 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1305 /* transmission will be done in resume */
1306 usb_anchor_urb(urb, &dev->deferred);
1307 /* no use to process more packets */
1308 netif_stop_queue(net);
1309 usb_put_urb(urb);
1310 spin_unlock_irqrestore(&dev->txq.lock, flags);
1311 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1312 goto deferred;
1313 }
1314 #endif
1315
1316 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1317 case -EPIPE:
1318 netif_stop_queue (net);
1319 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1320 usb_autopm_put_interface_async(dev->intf);
1321 break;
1322 default:
1323 usb_autopm_put_interface_async(dev->intf);
1324 netif_dbg(dev, tx_err, dev->net,
1325 "tx: submit urb err %d\n", retval);
1326 break;
1327 case 0:
1328 net->trans_start = jiffies;
1329 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1330 if (dev->txq.qlen >= TX_QLEN (dev))
1331 netif_stop_queue (net);
1332 }
1333 spin_unlock_irqrestore (&dev->txq.lock, flags);
1334
1335 if (retval) {
1336 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1337 drop:
1338 dev->net->stats.tx_dropped++;
1339 not_drop:
1340 if (skb)
1341 dev_kfree_skb_any (skb);
1342 if (urb) {
1343 kfree(urb->sg);
1344 usb_free_urb(urb);
1345 }
1346 } else
1347 netif_dbg(dev, tx_queued, dev->net,
1348 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1349 #ifdef CONFIG_PM
1350 deferred:
1351 #endif
1352 return NETDEV_TX_OK;
1353 }
1354 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1355
1356 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1357 {
1358 struct urb *urb;
1359 int i;
1360 int ret = 0;
1361
1362 /* don't refill the queue all at once */
1363 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1364 urb = usb_alloc_urb(0, flags);
1365 if (urb != NULL) {
1366 ret = rx_submit(dev, urb, flags);
1367 if (ret)
1368 goto err;
1369 } else {
1370 ret = -ENOMEM;
1371 goto err;
1372 }
1373 }
1374 err:
1375 return ret;
1376 }
1377
1378 /*-------------------------------------------------------------------------*/
1379
1380 // tasklet (work deferred from completions, in_irq) or timer
1381
1382 static void usbnet_bh (unsigned long param)
1383 {
1384 struct usbnet *dev = (struct usbnet *) param;
1385 struct sk_buff *skb;
1386 struct skb_data *entry;
1387
1388 while ((skb = skb_dequeue (&dev->done))) {
1389 entry = (struct skb_data *) skb->cb;
1390 switch (entry->state) {
1391 case rx_done:
1392 entry->state = rx_cleanup;
1393 rx_process (dev, skb);
1394 continue;
1395 case tx_done:
1396 kfree(entry->urb->sg);
1397 case rx_cleanup:
1398 usb_free_urb (entry->urb);
1399 dev_kfree_skb (skb);
1400 continue;
1401 default:
1402 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1403 }
1404 }
1405
1406 /* restart RX again after disabling due to high error rate */
1407 clear_bit(EVENT_RX_KILL, &dev->flags);
1408
1409 // waiting for all pending urbs to complete?
1410 if (dev->wait) {
1411 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1412 wake_up (dev->wait);
1413 }
1414
1415 // or are we maybe short a few urbs?
1416 } else if (netif_running (dev->net) &&
1417 netif_device_present (dev->net) &&
1418 netif_carrier_ok(dev->net) &&
1419 !timer_pending (&dev->delay) &&
1420 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1421 int temp = dev->rxq.qlen;
1422
1423 if (temp < RX_QLEN(dev)) {
1424 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1425 return;
1426 if (temp != dev->rxq.qlen)
1427 netif_dbg(dev, link, dev->net,
1428 "rxqlen %d --> %d\n",
1429 temp, dev->rxq.qlen);
1430 if (dev->rxq.qlen < RX_QLEN(dev))
1431 tasklet_schedule (&dev->bh);
1432 }
1433 if (dev->txq.qlen < TX_QLEN (dev))
1434 netif_wake_queue (dev->net);
1435 }
1436 }
1437
1438
1439 /*-------------------------------------------------------------------------
1440 *
1441 * USB Device Driver support
1442 *
1443 *-------------------------------------------------------------------------*/
1444
1445 // precondition: never called in_interrupt
1446
1447 void usbnet_disconnect (struct usb_interface *intf)
1448 {
1449 struct usbnet *dev;
1450 struct usb_device *xdev;
1451 struct net_device *net;
1452
1453 dev = usb_get_intfdata(intf);
1454 usb_set_intfdata(intf, NULL);
1455 if (!dev)
1456 return;
1457
1458 xdev = interface_to_usbdev (intf);
1459
1460 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1461 intf->dev.driver->name,
1462 xdev->bus->bus_name, xdev->devpath,
1463 dev->driver_info->description);
1464
1465 net = dev->net;
1466 unregister_netdev (net);
1467
1468 cancel_work_sync(&dev->kevent);
1469
1470 usb_scuttle_anchored_urbs(&dev->deferred);
1471
1472 if (dev->driver_info->unbind)
1473 dev->driver_info->unbind (dev, intf);
1474
1475 usb_kill_urb(dev->interrupt);
1476 usb_free_urb(dev->interrupt);
1477
1478 free_netdev(net);
1479 }
1480 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1481
1482 static const struct net_device_ops usbnet_netdev_ops = {
1483 .ndo_open = usbnet_open,
1484 .ndo_stop = usbnet_stop,
1485 .ndo_start_xmit = usbnet_start_xmit,
1486 .ndo_tx_timeout = usbnet_tx_timeout,
1487 .ndo_change_mtu = usbnet_change_mtu,
1488 .ndo_set_mac_address = eth_mac_addr,
1489 .ndo_validate_addr = eth_validate_addr,
1490 };
1491
1492 /*-------------------------------------------------------------------------*/
1493
1494 // precondition: never called in_interrupt
1495
1496 static struct device_type wlan_type = {
1497 .name = "wlan",
1498 };
1499
1500 static struct device_type wwan_type = {
1501 .name = "wwan",
1502 };
1503
1504 int
1505 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1506 {
1507 struct usbnet *dev;
1508 struct net_device *net;
1509 struct usb_host_interface *interface;
1510 struct driver_info *info;
1511 struct usb_device *xdev;
1512 int status;
1513 const char *name;
1514 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1515
1516 /* usbnet already took usb runtime pm, so have to enable the feature
1517 * for usb interface, otherwise usb_autopm_get_interface may return
1518 * failure if RUNTIME_PM is enabled.
1519 */
1520 if (!driver->supports_autosuspend) {
1521 driver->supports_autosuspend = 1;
1522 pm_runtime_enable(&udev->dev);
1523 }
1524
1525 name = udev->dev.driver->name;
1526 info = (struct driver_info *) prod->driver_info;
1527 if (!info) {
1528 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1529 return -ENODEV;
1530 }
1531 xdev = interface_to_usbdev (udev);
1532 interface = udev->cur_altsetting;
1533
1534 status = -ENOMEM;
1535
1536 // set up our own records
1537 net = alloc_etherdev(sizeof(*dev));
1538 if (!net)
1539 goto out;
1540
1541 /* netdev_printk() needs this so do it as early as possible */
1542 SET_NETDEV_DEV(net, &udev->dev);
1543
1544 dev = netdev_priv(net);
1545 dev->udev = xdev;
1546 dev->intf = udev;
1547 dev->driver_info = info;
1548 dev->driver_name = name;
1549 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1550 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1551 skb_queue_head_init (&dev->rxq);
1552 skb_queue_head_init (&dev->txq);
1553 skb_queue_head_init (&dev->done);
1554 skb_queue_head_init(&dev->rxq_pause);
1555 dev->bh.func = usbnet_bh;
1556 dev->bh.data = (unsigned long) dev;
1557 INIT_WORK (&dev->kevent, kevent);
1558 init_usb_anchor(&dev->deferred);
1559 dev->delay.function = usbnet_bh;
1560 dev->delay.data = (unsigned long) dev;
1561 init_timer (&dev->delay);
1562 mutex_init (&dev->phy_mutex);
1563 mutex_init(&dev->interrupt_mutex);
1564 dev->interrupt_count = 0;
1565
1566 dev->net = net;
1567 strcpy (net->name, "usb%d");
1568 memcpy (net->dev_addr, node_id, sizeof node_id);
1569
1570 /* rx and tx sides can use different message sizes;
1571 * bind() should set rx_urb_size in that case.
1572 */
1573 dev->hard_mtu = net->mtu + net->hard_header_len;
1574 #if 0
1575 // dma_supported() is deeply broken on almost all architectures
1576 // possible with some EHCI controllers
1577 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1578 net->features |= NETIF_F_HIGHDMA;
1579 #endif
1580
1581 net->netdev_ops = &usbnet_netdev_ops;
1582 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1583 net->ethtool_ops = &usbnet_ethtool_ops;
1584
1585 // allow device-specific bind/init procedures
1586 // NOTE net->name still not usable ...
1587 if (info->bind) {
1588 status = info->bind (dev, udev);
1589 if (status < 0)
1590 goto out1;
1591
1592 // heuristic: "usb%d" for links we know are two-host,
1593 // else "eth%d" when there's reasonable doubt. userspace
1594 // can rename the link if it knows better.
1595 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1596 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1597 (net->dev_addr [0] & 0x02) == 0))
1598 strcpy (net->name, "eth%d");
1599 /* WLAN devices should always be named "wlan%d" */
1600 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1601 strcpy(net->name, "wlan%d");
1602 /* WWAN devices should always be named "wwan%d" */
1603 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1604 strcpy(net->name, "wwan%d");
1605
1606 /* devices that cannot do ARP */
1607 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1608 net->flags |= IFF_NOARP;
1609
1610 /* maybe the remote can't receive an Ethernet MTU */
1611 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1612 net->mtu = dev->hard_mtu - net->hard_header_len;
1613 } else if (!info->in || !info->out)
1614 status = usbnet_get_endpoints (dev, udev);
1615 else {
1616 dev->in = usb_rcvbulkpipe (xdev, info->in);
1617 dev->out = usb_sndbulkpipe (xdev, info->out);
1618 if (!(info->flags & FLAG_NO_SETINT))
1619 status = usb_set_interface (xdev,
1620 interface->desc.bInterfaceNumber,
1621 interface->desc.bAlternateSetting);
1622 else
1623 status = 0;
1624
1625 }
1626 if (status >= 0 && dev->status)
1627 status = init_status (dev, udev);
1628 if (status < 0)
1629 goto out3;
1630
1631 if (!dev->rx_urb_size)
1632 dev->rx_urb_size = dev->hard_mtu;
1633 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1634
1635 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1636 SET_NETDEV_DEVTYPE(net, &wlan_type);
1637 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1638 SET_NETDEV_DEVTYPE(net, &wwan_type);
1639
1640 status = register_netdev (net);
1641 if (status)
1642 goto out4;
1643 netif_info(dev, probe, dev->net,
1644 "register '%s' at usb-%s-%s, %s, %pM\n",
1645 udev->dev.driver->name,
1646 xdev->bus->bus_name, xdev->devpath,
1647 dev->driver_info->description,
1648 net->dev_addr);
1649
1650 // ok, it's ready to go.
1651 usb_set_intfdata (udev, dev);
1652
1653 netif_device_attach (net);
1654
1655 if (dev->driver_info->flags & FLAG_LINK_INTR)
1656 usbnet_link_change(dev, 0, 0);
1657
1658 return 0;
1659
1660 out4:
1661 usb_free_urb(dev->interrupt);
1662 out3:
1663 if (info->unbind)
1664 info->unbind (dev, udev);
1665 out1:
1666 free_netdev(net);
1667 out:
1668 return status;
1669 }
1670 EXPORT_SYMBOL_GPL(usbnet_probe);
1671
1672 /*-------------------------------------------------------------------------*/
1673
1674 /*
1675 * suspend the whole driver as soon as the first interface is suspended
1676 * resume only when the last interface is resumed
1677 */
1678
1679 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1680 {
1681 struct usbnet *dev = usb_get_intfdata(intf);
1682
1683 if (!dev->suspend_count++) {
1684 spin_lock_irq(&dev->txq.lock);
1685 /* don't autosuspend while transmitting */
1686 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1687 dev->suspend_count--;
1688 spin_unlock_irq(&dev->txq.lock);
1689 return -EBUSY;
1690 } else {
1691 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1692 spin_unlock_irq(&dev->txq.lock);
1693 }
1694 /*
1695 * accelerate emptying of the rx and queues, to avoid
1696 * having everything error out.
1697 */
1698 netif_device_detach (dev->net);
1699 usbnet_terminate_urbs(dev);
1700 __usbnet_status_stop_force(dev);
1701
1702 /*
1703 * reattach so runtime management can use and
1704 * wake the device
1705 */
1706 netif_device_attach (dev->net);
1707 }
1708 return 0;
1709 }
1710 EXPORT_SYMBOL_GPL(usbnet_suspend);
1711
1712 int usbnet_resume (struct usb_interface *intf)
1713 {
1714 struct usbnet *dev = usb_get_intfdata(intf);
1715 struct sk_buff *skb;
1716 struct urb *res;
1717 int retval;
1718
1719 if (!--dev->suspend_count) {
1720 /* resume interrupt URB if it was previously submitted */
1721 __usbnet_status_start_force(dev, GFP_NOIO);
1722
1723 spin_lock_irq(&dev->txq.lock);
1724 while ((res = usb_get_from_anchor(&dev->deferred))) {
1725
1726 skb = (struct sk_buff *)res->context;
1727 retval = usb_submit_urb(res, GFP_ATOMIC);
1728 if (retval < 0) {
1729 dev_kfree_skb_any(skb);
1730 kfree(res->sg);
1731 usb_free_urb(res);
1732 usb_autopm_put_interface_async(dev->intf);
1733 } else {
1734 dev->net->trans_start = jiffies;
1735 __skb_queue_tail(&dev->txq, skb);
1736 }
1737 }
1738
1739 smp_mb();
1740 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1741 spin_unlock_irq(&dev->txq.lock);
1742
1743 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1744 /* handle remote wakeup ASAP */
1745 if (!dev->wait &&
1746 netif_device_present(dev->net) &&
1747 !timer_pending(&dev->delay) &&
1748 !test_bit(EVENT_RX_HALT, &dev->flags))
1749 rx_alloc_submit(dev, GFP_NOIO);
1750
1751 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1752 netif_tx_wake_all_queues(dev->net);
1753 tasklet_schedule (&dev->bh);
1754 }
1755 }
1756
1757 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1758 usb_autopm_get_interface_no_resume(intf);
1759
1760 return 0;
1761 }
1762 EXPORT_SYMBOL_GPL(usbnet_resume);
1763
1764 /*
1765 * Either a subdriver implements manage_power, then it is assumed to always
1766 * be ready to be suspended or it reports the readiness to be suspended
1767 * explicitly
1768 */
1769 void usbnet_device_suggests_idle(struct usbnet *dev)
1770 {
1771 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1772 dev->intf->needs_remote_wakeup = 1;
1773 usb_autopm_put_interface_async(dev->intf);
1774 }
1775 }
1776 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1777
1778 /*
1779 * For devices that can do without special commands
1780 */
1781 int usbnet_manage_power(struct usbnet *dev, int on)
1782 {
1783 dev->intf->needs_remote_wakeup = on;
1784 return 0;
1785 }
1786 EXPORT_SYMBOL(usbnet_manage_power);
1787
1788 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1789 {
1790 /* update link after link is reseted */
1791 if (link && !need_reset)
1792 netif_carrier_on(dev->net);
1793 else
1794 netif_carrier_off(dev->net);
1795
1796 if (need_reset && link)
1797 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1798 else
1799 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1800 }
1801 EXPORT_SYMBOL(usbnet_link_change);
1802
1803 /*-------------------------------------------------------------------------*/
1804 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1805 u16 value, u16 index, void *data, u16 size)
1806 {
1807 void *buf = NULL;
1808 int err = -ENOMEM;
1809
1810 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1811 " value=0x%04x index=0x%04x size=%d\n",
1812 cmd, reqtype, value, index, size);
1813
1814 if (data) {
1815 buf = kmalloc(size, GFP_KERNEL);
1816 if (!buf)
1817 goto out;
1818 }
1819
1820 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1821 cmd, reqtype, value, index, buf, size,
1822 USB_CTRL_GET_TIMEOUT);
1823 if (err > 0 && err <= size)
1824 memcpy(data, buf, err);
1825 kfree(buf);
1826 out:
1827 return err;
1828 }
1829
1830 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1831 u16 value, u16 index, const void *data,
1832 u16 size)
1833 {
1834 void *buf = NULL;
1835 int err = -ENOMEM;
1836
1837 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1838 " value=0x%04x index=0x%04x size=%d\n",
1839 cmd, reqtype, value, index, size);
1840
1841 if (data) {
1842 buf = kmemdup(data, size, GFP_KERNEL);
1843 if (!buf)
1844 goto out;
1845 }
1846
1847 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1848 cmd, reqtype, value, index, buf, size,
1849 USB_CTRL_SET_TIMEOUT);
1850 kfree(buf);
1851
1852 out:
1853 return err;
1854 }
1855
1856 /*
1857 * The function can't be called inside suspend/resume callback,
1858 * otherwise deadlock will be caused.
1859 */
1860 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1861 u16 value, u16 index, void *data, u16 size)
1862 {
1863 int ret;
1864
1865 if (usb_autopm_get_interface(dev->intf) < 0)
1866 return -ENODEV;
1867 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1868 data, size);
1869 usb_autopm_put_interface(dev->intf);
1870 return ret;
1871 }
1872 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1873
1874 /*
1875 * The function can't be called inside suspend/resume callback,
1876 * otherwise deadlock will be caused.
1877 */
1878 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1879 u16 value, u16 index, const void *data, u16 size)
1880 {
1881 int ret;
1882
1883 if (usb_autopm_get_interface(dev->intf) < 0)
1884 return -ENODEV;
1885 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1886 data, size);
1887 usb_autopm_put_interface(dev->intf);
1888 return ret;
1889 }
1890 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1891
1892 /*
1893 * The function can be called inside suspend/resume callback safely
1894 * and should only be called by suspend/resume callback generally.
1895 */
1896 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1897 u16 value, u16 index, void *data, u16 size)
1898 {
1899 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1900 data, size);
1901 }
1902 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1903
1904 /*
1905 * The function can be called inside suspend/resume callback safely
1906 * and should only be called by suspend/resume callback generally.
1907 */
1908 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1909 u16 value, u16 index, const void *data,
1910 u16 size)
1911 {
1912 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1913 data, size);
1914 }
1915 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1916
1917 static void usbnet_async_cmd_cb(struct urb *urb)
1918 {
1919 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1920 int status = urb->status;
1921
1922 if (status < 0)
1923 dev_dbg(&urb->dev->dev, "%s failed with %d",
1924 __func__, status);
1925
1926 kfree(req);
1927 usb_free_urb(urb);
1928 }
1929
1930 /*
1931 * The caller must make sure that device can't be put into suspend
1932 * state until the control URB completes.
1933 */
1934 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1935 u16 value, u16 index, const void *data, u16 size)
1936 {
1937 struct usb_ctrlrequest *req = NULL;
1938 struct urb *urb;
1939 int err = -ENOMEM;
1940 void *buf = NULL;
1941
1942 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1943 " value=0x%04x index=0x%04x size=%d\n",
1944 cmd, reqtype, value, index, size);
1945
1946 urb = usb_alloc_urb(0, GFP_ATOMIC);
1947 if (!urb) {
1948 netdev_err(dev->net, "Error allocating URB in"
1949 " %s!\n", __func__);
1950 goto fail;
1951 }
1952
1953 if (data) {
1954 buf = kmemdup(data, size, GFP_ATOMIC);
1955 if (!buf) {
1956 netdev_err(dev->net, "Error allocating buffer"
1957 " in %s!\n", __func__);
1958 goto fail_free;
1959 }
1960 }
1961
1962 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
1963 if (!req)
1964 goto fail_free_buf;
1965
1966 req->bRequestType = reqtype;
1967 req->bRequest = cmd;
1968 req->wValue = cpu_to_le16(value);
1969 req->wIndex = cpu_to_le16(index);
1970 req->wLength = cpu_to_le16(size);
1971
1972 usb_fill_control_urb(urb, dev->udev,
1973 usb_sndctrlpipe(dev->udev, 0),
1974 (void *)req, buf, size,
1975 usbnet_async_cmd_cb, req);
1976 urb->transfer_flags |= URB_FREE_BUFFER;
1977
1978 err = usb_submit_urb(urb, GFP_ATOMIC);
1979 if (err < 0) {
1980 netdev_err(dev->net, "Error submitting the control"
1981 " message: status=%d\n", err);
1982 goto fail_free;
1983 }
1984 return 0;
1985
1986 fail_free_buf:
1987 kfree(buf);
1988 fail_free:
1989 kfree(req);
1990 usb_free_urb(urb);
1991 fail:
1992 return err;
1993
1994 }
1995 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
1996 /*-------------------------------------------------------------------------*/
1997
1998 static int __init usbnet_init(void)
1999 {
2000 /* Compiler should optimize this out. */
2001 BUILD_BUG_ON(
2002 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2003
2004 eth_random_addr(node_id);
2005 return 0;
2006 }
2007 module_init(usbnet_init);
2008
2009 static void __exit usbnet_exit(void)
2010 {
2011 }
2012 module_exit(usbnet_exit);
2013
2014 MODULE_AUTHOR("David Brownell");
2015 MODULE_DESCRIPTION("USB network driver framework");
2016 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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