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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
[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 * The goal is to let the USB host controller be busy for 5msec or
63 * more before an irq is required, under load. Jumbograms change
64 * the equation.
65 */
66 #define MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) ((dev)->rx_qlen)
68 #define TX_QLEN(dev) ((dev)->tx_qlen)
69
70 // reawaken network queue this soon after stopping; else watchdog barks
71 #define TX_TIMEOUT_JIFFIES (5*HZ)
72
73 // throttle rx/tx briefly after some faults, so khubd might disconnect()
74 // us (it polls at HZ/4 usually) before we report too many false errors.
75 #define THROTTLE_JIFFIES (HZ/8)
76
77 // between wakeups
78 #define UNLINK_TIMEOUT_MS 3
79
80 /*-------------------------------------------------------------------------*/
81
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
84
85 static const char driver_name [] = "usbnet";
86
87 /* use ethtool to change the level for any given device */
88 static int msg_level = -1;
89 module_param (msg_level, int, 0);
90 MODULE_PARM_DESC (msg_level, "Override default message level");
91
92 /*-------------------------------------------------------------------------*/
93
94 /* handles CDC Ethernet and many other network "bulk data" interfaces */
95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96 {
97 int tmp;
98 struct usb_host_interface *alt = NULL;
99 struct usb_host_endpoint *in = NULL, *out = NULL;
100 struct usb_host_endpoint *status = NULL;
101
102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 unsigned ep;
104
105 in = out = status = NULL;
106 alt = intf->altsetting + tmp;
107
108 /* take the first altsetting with in-bulk + out-bulk;
109 * remember any status endpoint, just in case;
110 * ignore other endpoints and altsettings.
111 */
112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
113 struct usb_host_endpoint *e;
114 int intr = 0;
115
116 e = alt->endpoint + ep;
117 switch (e->desc.bmAttributes) {
118 case USB_ENDPOINT_XFER_INT:
119 if (!usb_endpoint_dir_in(&e->desc))
120 continue;
121 intr = 1;
122 /* FALLTHROUGH */
123 case USB_ENDPOINT_XFER_BULK:
124 break;
125 default:
126 continue;
127 }
128 if (usb_endpoint_dir_in(&e->desc)) {
129 if (!intr && !in)
130 in = e;
131 else if (intr && !status)
132 status = e;
133 } else {
134 if (!out)
135 out = e;
136 }
137 }
138 if (in && out)
139 break;
140 }
141 if (!alt || !in || !out)
142 return -EINVAL;
143
144 if (alt->desc.bAlternateSetting != 0 ||
145 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
147 alt->desc.bAlternateSetting);
148 if (tmp < 0)
149 return tmp;
150 }
151
152 dev->in = usb_rcvbulkpipe (dev->udev,
153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->out = usb_sndbulkpipe (dev->udev,
155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->status = status;
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
160
161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
162 {
163 int tmp, i;
164 unsigned char buf [13];
165
166 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
167 if (tmp != 12) {
168 dev_dbg(&dev->udev->dev,
169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
170 if (tmp >= 0)
171 tmp = -EINVAL;
172 return tmp;
173 }
174 for (i = tmp = 0; i < 6; i++, tmp += 2)
175 dev->net->dev_addr [i] =
176 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
177 return 0;
178 }
179 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
180
181 static void intr_complete (struct urb *urb)
182 {
183 struct usbnet *dev = urb->context;
184 int status = urb->status;
185
186 switch (status) {
187 /* success */
188 case 0:
189 dev->driver_info->status(dev, urb);
190 break;
191
192 /* software-driven interface shutdown */
193 case -ENOENT: /* urb killed */
194 case -ESHUTDOWN: /* hardware gone */
195 netif_dbg(dev, ifdown, dev->net,
196 "intr shutdown, code %d\n", status);
197 return;
198
199 /* NOTE: not throttling like RX/TX, since this endpoint
200 * already polls infrequently
201 */
202 default:
203 netdev_dbg(dev->net, "intr status %d\n", status);
204 break;
205 }
206
207 if (!netif_running (dev->net))
208 return;
209
210 status = usb_submit_urb (urb, GFP_ATOMIC);
211 if (status != 0)
212 netif_err(dev, timer, dev->net,
213 "intr resubmit --> %d\n", status);
214 }
215
216 static int init_status (struct usbnet *dev, struct usb_interface *intf)
217 {
218 char *buf = NULL;
219 unsigned pipe = 0;
220 unsigned maxp;
221 unsigned period;
222
223 if (!dev->driver_info->status)
224 return 0;
225
226 pipe = usb_rcvintpipe (dev->udev,
227 dev->status->desc.bEndpointAddress
228 & USB_ENDPOINT_NUMBER_MASK);
229 maxp = usb_maxpacket (dev->udev, pipe, 0);
230
231 /* avoid 1 msec chatter: min 8 msec poll rate */
232 period = max ((int) dev->status->desc.bInterval,
233 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
234
235 buf = kmalloc (maxp, GFP_KERNEL);
236 if (buf) {
237 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
238 if (!dev->interrupt) {
239 kfree (buf);
240 return -ENOMEM;
241 } else {
242 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
243 buf, maxp, intr_complete, dev, period);
244 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
245 dev_dbg(&intf->dev,
246 "status ep%din, %d bytes period %d\n",
247 usb_pipeendpoint(pipe), maxp, period);
248 }
249 }
250 return 0;
251 }
252
253 /* Submit the interrupt URB if not previously submitted, increasing refcount */
254 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
255 {
256 int ret = 0;
257
258 WARN_ON_ONCE(dev->interrupt == NULL);
259 if (dev->interrupt) {
260 mutex_lock(&dev->interrupt_mutex);
261
262 if (++dev->interrupt_count == 1)
263 ret = usb_submit_urb(dev->interrupt, mem_flags);
264
265 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
266 dev->interrupt_count);
267 mutex_unlock(&dev->interrupt_mutex);
268 }
269 return ret;
270 }
271 EXPORT_SYMBOL_GPL(usbnet_status_start);
272
273 /* For resume; submit interrupt URB if previously submitted */
274 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
275 {
276 int ret = 0;
277
278 mutex_lock(&dev->interrupt_mutex);
279 if (dev->interrupt_count) {
280 ret = usb_submit_urb(dev->interrupt, mem_flags);
281 dev_dbg(&dev->udev->dev,
282 "submitted interrupt URB for resume\n");
283 }
284 mutex_unlock(&dev->interrupt_mutex);
285 return ret;
286 }
287
288 /* Kill the interrupt URB if all submitters want it killed */
289 void usbnet_status_stop(struct usbnet *dev)
290 {
291 if (dev->interrupt) {
292 mutex_lock(&dev->interrupt_mutex);
293 WARN_ON(dev->interrupt_count == 0);
294
295 if (dev->interrupt_count && --dev->interrupt_count == 0)
296 usb_kill_urb(dev->interrupt);
297
298 dev_dbg(&dev->udev->dev,
299 "decremented interrupt URB count to %d\n",
300 dev->interrupt_count);
301 mutex_unlock(&dev->interrupt_mutex);
302 }
303 }
304 EXPORT_SYMBOL_GPL(usbnet_status_stop);
305
306 /* For suspend; always kill interrupt URB */
307 static void __usbnet_status_stop_force(struct usbnet *dev)
308 {
309 if (dev->interrupt) {
310 mutex_lock(&dev->interrupt_mutex);
311 usb_kill_urb(dev->interrupt);
312 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
313 mutex_unlock(&dev->interrupt_mutex);
314 }
315 }
316
317 /* Passes this packet up the stack, updating its accounting.
318 * Some link protocols batch packets, so their rx_fixup paths
319 * can return clones as well as just modify the original skb.
320 */
321 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
322 {
323 int status;
324
325 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
326 skb_queue_tail(&dev->rxq_pause, skb);
327 return;
328 }
329
330 skb->protocol = eth_type_trans (skb, dev->net);
331 dev->net->stats.rx_packets++;
332 dev->net->stats.rx_bytes += skb->len;
333
334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
335 skb->len + sizeof (struct ethhdr), skb->protocol);
336 memset (skb->cb, 0, sizeof (struct skb_data));
337
338 if (skb_defer_rx_timestamp(skb))
339 return;
340
341 status = netif_rx (skb);
342 if (status != NET_RX_SUCCESS)
343 netif_dbg(dev, rx_err, dev->net,
344 "netif_rx status %d\n", status);
345 }
346 EXPORT_SYMBOL_GPL(usbnet_skb_return);
347
348 /* must be called if hard_mtu or rx_urb_size changed */
349 void usbnet_update_max_qlen(struct usbnet *dev)
350 {
351 enum usb_device_speed speed = dev->udev->speed;
352
353 switch (speed) {
354 case USB_SPEED_HIGH:
355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
357 break;
358 case USB_SPEED_SUPER:
359 /*
360 * Not take default 5ms qlen for super speed HC to
361 * save memory, and iperf tests show 2.5ms qlen can
362 * work well
363 */
364 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
365 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
366 break;
367 default:
368 dev->rx_qlen = dev->tx_qlen = 4;
369 }
370 }
371 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
372
373 \f
374 /*-------------------------------------------------------------------------
375 *
376 * Network Device Driver (peer link to "Host Device", from USB host)
377 *
378 *-------------------------------------------------------------------------*/
379
380 int usbnet_change_mtu (struct net_device *net, int new_mtu)
381 {
382 struct usbnet *dev = netdev_priv(net);
383 int ll_mtu = new_mtu + net->hard_header_len;
384 int old_hard_mtu = dev->hard_mtu;
385 int old_rx_urb_size = dev->rx_urb_size;
386
387 if (new_mtu <= 0)
388 return -EINVAL;
389 // no second zero-length packet read wanted after mtu-sized packets
390 if ((ll_mtu % dev->maxpacket) == 0)
391 return -EDOM;
392 net->mtu = new_mtu;
393
394 dev->hard_mtu = net->mtu + net->hard_header_len;
395 if (dev->rx_urb_size == old_hard_mtu) {
396 dev->rx_urb_size = dev->hard_mtu;
397 if (dev->rx_urb_size > old_rx_urb_size)
398 usbnet_unlink_rx_urbs(dev);
399 }
400
401 /* max qlen depend on hard_mtu and rx_urb_size */
402 usbnet_update_max_qlen(dev);
403
404 return 0;
405 }
406 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
407
408 /* The caller must hold list->lock */
409 static void __usbnet_queue_skb(struct sk_buff_head *list,
410 struct sk_buff *newsk, enum skb_state state)
411 {
412 struct skb_data *entry = (struct skb_data *) newsk->cb;
413
414 __skb_queue_tail(list, newsk);
415 entry->state = state;
416 }
417
418 /*-------------------------------------------------------------------------*/
419
420 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
421 * completion callbacks. 2.5 should have fixed those bugs...
422 */
423
424 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
425 struct sk_buff_head *list, enum skb_state state)
426 {
427 unsigned long flags;
428 enum skb_state old_state;
429 struct skb_data *entry = (struct skb_data *) skb->cb;
430
431 spin_lock_irqsave(&list->lock, flags);
432 old_state = entry->state;
433 entry->state = state;
434 __skb_unlink(skb, list);
435 spin_unlock(&list->lock);
436 spin_lock(&dev->done.lock);
437 __skb_queue_tail(&dev->done, skb);
438 if (dev->done.qlen == 1)
439 tasklet_schedule(&dev->bh);
440 spin_unlock_irqrestore(&dev->done.lock, flags);
441 return old_state;
442 }
443
444 /* some work can't be done in tasklets, so we use keventd
445 *
446 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
447 * but tasklet_schedule() doesn't. hope the failure is rare.
448 */
449 void usbnet_defer_kevent (struct usbnet *dev, int work)
450 {
451 set_bit (work, &dev->flags);
452 if (!schedule_work (&dev->kevent)) {
453 if (net_ratelimit())
454 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
455 } else {
456 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
457 }
458 }
459 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
460
461 /*-------------------------------------------------------------------------*/
462
463 static void rx_complete (struct urb *urb);
464
465 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
466 {
467 struct sk_buff *skb;
468 struct skb_data *entry;
469 int retval = 0;
470 unsigned long lockflags;
471 size_t size = dev->rx_urb_size;
472
473 /* prevent rx skb allocation when error ratio is high */
474 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
475 usb_free_urb(urb);
476 return -ENOLINK;
477 }
478
479 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
480 if (!skb) {
481 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
482 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
483 usb_free_urb (urb);
484 return -ENOMEM;
485 }
486
487 entry = (struct skb_data *) skb->cb;
488 entry->urb = urb;
489 entry->dev = dev;
490 entry->length = 0;
491
492 usb_fill_bulk_urb (urb, dev->udev, dev->in,
493 skb->data, size, rx_complete, skb);
494
495 spin_lock_irqsave (&dev->rxq.lock, lockflags);
496
497 if (netif_running (dev->net) &&
498 netif_device_present (dev->net) &&
499 !test_bit (EVENT_RX_HALT, &dev->flags) &&
500 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
501 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
502 case -EPIPE:
503 usbnet_defer_kevent (dev, EVENT_RX_HALT);
504 break;
505 case -ENOMEM:
506 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
507 break;
508 case -ENODEV:
509 netif_dbg(dev, ifdown, dev->net, "device gone\n");
510 netif_device_detach (dev->net);
511 break;
512 case -EHOSTUNREACH:
513 retval = -ENOLINK;
514 break;
515 default:
516 netif_dbg(dev, rx_err, dev->net,
517 "rx submit, %d\n", retval);
518 tasklet_schedule (&dev->bh);
519 break;
520 case 0:
521 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
522 }
523 } else {
524 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
525 retval = -ENOLINK;
526 }
527 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
528 if (retval) {
529 dev_kfree_skb_any (skb);
530 usb_free_urb (urb);
531 }
532 return retval;
533 }
534
535
536 /*-------------------------------------------------------------------------*/
537
538 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
539 {
540 if (dev->driver_info->rx_fixup &&
541 !dev->driver_info->rx_fixup (dev, skb)) {
542 /* With RX_ASSEMBLE, rx_fixup() must update counters */
543 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
544 dev->net->stats.rx_errors++;
545 goto done;
546 }
547 // else network stack removes extra byte if we forced a short packet
548
549 if (skb->len) {
550 /* all data was already cloned from skb inside the driver */
551 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
552 dev_kfree_skb_any(skb);
553 else
554 usbnet_skb_return(dev, skb);
555 return;
556 }
557
558 netif_dbg(dev, rx_err, dev->net, "drop\n");
559 dev->net->stats.rx_errors++;
560 done:
561 skb_queue_tail(&dev->done, skb);
562 }
563
564 /*-------------------------------------------------------------------------*/
565
566 static void rx_complete (struct urb *urb)
567 {
568 struct sk_buff *skb = (struct sk_buff *) urb->context;
569 struct skb_data *entry = (struct skb_data *) skb->cb;
570 struct usbnet *dev = entry->dev;
571 int urb_status = urb->status;
572 enum skb_state state;
573
574 skb_put (skb, urb->actual_length);
575 state = rx_done;
576 entry->urb = NULL;
577
578 switch (urb_status) {
579 /* success */
580 case 0:
581 if (skb->len < dev->net->hard_header_len) {
582 state = rx_cleanup;
583 dev->net->stats.rx_errors++;
584 dev->net->stats.rx_length_errors++;
585 netif_dbg(dev, rx_err, dev->net,
586 "rx length %d\n", skb->len);
587 }
588 break;
589
590 /* stalls need manual reset. this is rare ... except that
591 * when going through USB 2.0 TTs, unplug appears this way.
592 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
593 * storm, recovering as needed.
594 */
595 case -EPIPE:
596 dev->net->stats.rx_errors++;
597 usbnet_defer_kevent (dev, EVENT_RX_HALT);
598 // FALLTHROUGH
599
600 /* software-driven interface shutdown */
601 case -ECONNRESET: /* async unlink */
602 case -ESHUTDOWN: /* hardware gone */
603 netif_dbg(dev, ifdown, dev->net,
604 "rx shutdown, code %d\n", urb_status);
605 goto block;
606
607 /* we get controller i/o faults during khubd disconnect() delays.
608 * throttle down resubmits, to avoid log floods; just temporarily,
609 * so we still recover when the fault isn't a khubd delay.
610 */
611 case -EPROTO:
612 case -ETIME:
613 case -EILSEQ:
614 dev->net->stats.rx_errors++;
615 if (!timer_pending (&dev->delay)) {
616 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
617 netif_dbg(dev, link, dev->net,
618 "rx throttle %d\n", urb_status);
619 }
620 block:
621 state = rx_cleanup;
622 entry->urb = urb;
623 urb = NULL;
624 break;
625
626 /* data overrun ... flush fifo? */
627 case -EOVERFLOW:
628 dev->net->stats.rx_over_errors++;
629 // FALLTHROUGH
630
631 default:
632 state = rx_cleanup;
633 dev->net->stats.rx_errors++;
634 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
635 break;
636 }
637
638 /* stop rx if packet error rate is high */
639 if (++dev->pkt_cnt > 30) {
640 dev->pkt_cnt = 0;
641 dev->pkt_err = 0;
642 } else {
643 if (state == rx_cleanup)
644 dev->pkt_err++;
645 if (dev->pkt_err > 20)
646 set_bit(EVENT_RX_KILL, &dev->flags);
647 }
648
649 state = defer_bh(dev, skb, &dev->rxq, state);
650
651 if (urb) {
652 if (netif_running (dev->net) &&
653 !test_bit (EVENT_RX_HALT, &dev->flags) &&
654 state != unlink_start) {
655 rx_submit (dev, urb, GFP_ATOMIC);
656 usb_mark_last_busy(dev->udev);
657 return;
658 }
659 usb_free_urb (urb);
660 }
661 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
662 }
663
664 /*-------------------------------------------------------------------------*/
665 void usbnet_pause_rx(struct usbnet *dev)
666 {
667 set_bit(EVENT_RX_PAUSED, &dev->flags);
668
669 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
670 }
671 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
672
673 void usbnet_resume_rx(struct usbnet *dev)
674 {
675 struct sk_buff *skb;
676 int num = 0;
677
678 clear_bit(EVENT_RX_PAUSED, &dev->flags);
679
680 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
681 usbnet_skb_return(dev, skb);
682 num++;
683 }
684
685 tasklet_schedule(&dev->bh);
686
687 netif_dbg(dev, rx_status, dev->net,
688 "paused rx queue disabled, %d skbs requeued\n", num);
689 }
690 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
691
692 void usbnet_purge_paused_rxq(struct usbnet *dev)
693 {
694 skb_queue_purge(&dev->rxq_pause);
695 }
696 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
697
698 /*-------------------------------------------------------------------------*/
699
700 // unlink pending rx/tx; completion handlers do all other cleanup
701
702 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
703 {
704 unsigned long flags;
705 struct sk_buff *skb;
706 int count = 0;
707
708 spin_lock_irqsave (&q->lock, flags);
709 while (!skb_queue_empty(q)) {
710 struct skb_data *entry;
711 struct urb *urb;
712 int retval;
713
714 skb_queue_walk(q, skb) {
715 entry = (struct skb_data *) skb->cb;
716 if (entry->state != unlink_start)
717 goto found;
718 }
719 break;
720 found:
721 entry->state = unlink_start;
722 urb = entry->urb;
723
724 /*
725 * Get reference count of the URB to avoid it to be
726 * freed during usb_unlink_urb, which may trigger
727 * use-after-free problem inside usb_unlink_urb since
728 * usb_unlink_urb is always racing with .complete
729 * handler(include defer_bh).
730 */
731 usb_get_urb(urb);
732 spin_unlock_irqrestore(&q->lock, flags);
733 // during some PM-driven resume scenarios,
734 // these (async) unlinks complete immediately
735 retval = usb_unlink_urb (urb);
736 if (retval != -EINPROGRESS && retval != 0)
737 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
738 else
739 count++;
740 usb_put_urb(urb);
741 spin_lock_irqsave(&q->lock, flags);
742 }
743 spin_unlock_irqrestore (&q->lock, flags);
744 return count;
745 }
746
747 // Flush all pending rx urbs
748 // minidrivers may need to do this when the MTU changes
749
750 void usbnet_unlink_rx_urbs(struct usbnet *dev)
751 {
752 if (netif_running(dev->net)) {
753 (void) unlink_urbs (dev, &dev->rxq);
754 tasklet_schedule(&dev->bh);
755 }
756 }
757 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
758
759 /*-------------------------------------------------------------------------*/
760
761 // precondition: never called in_interrupt
762 static void usbnet_terminate_urbs(struct usbnet *dev)
763 {
764 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
765 DECLARE_WAITQUEUE(wait, current);
766 int temp;
767
768 /* ensure there are no more active urbs */
769 add_wait_queue(&unlink_wakeup, &wait);
770 set_current_state(TASK_UNINTERRUPTIBLE);
771 dev->wait = &unlink_wakeup;
772 temp = unlink_urbs(dev, &dev->txq) +
773 unlink_urbs(dev, &dev->rxq);
774
775 /* maybe wait for deletions to finish. */
776 while (!skb_queue_empty(&dev->rxq)
777 && !skb_queue_empty(&dev->txq)
778 && !skb_queue_empty(&dev->done)) {
779 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
780 set_current_state(TASK_UNINTERRUPTIBLE);
781 netif_dbg(dev, ifdown, dev->net,
782 "waited for %d urb completions\n", temp);
783 }
784 set_current_state(TASK_RUNNING);
785 dev->wait = NULL;
786 remove_wait_queue(&unlink_wakeup, &wait);
787 }
788
789 int usbnet_stop (struct net_device *net)
790 {
791 struct usbnet *dev = netdev_priv(net);
792 struct driver_info *info = dev->driver_info;
793 int retval;
794
795 clear_bit(EVENT_DEV_OPEN, &dev->flags);
796 netif_stop_queue (net);
797
798 netif_info(dev, ifdown, dev->net,
799 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
800 net->stats.rx_packets, net->stats.tx_packets,
801 net->stats.rx_errors, net->stats.tx_errors);
802
803 /* allow minidriver to stop correctly (wireless devices to turn off
804 * radio etc) */
805 if (info->stop) {
806 retval = info->stop(dev);
807 if (retval < 0)
808 netif_info(dev, ifdown, dev->net,
809 "stop fail (%d) usbnet usb-%s-%s, %s\n",
810 retval,
811 dev->udev->bus->bus_name, dev->udev->devpath,
812 info->description);
813 }
814
815 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
816 usbnet_terminate_urbs(dev);
817
818 usbnet_status_stop(dev);
819
820 usbnet_purge_paused_rxq(dev);
821
822 /* deferred work (task, timer, softirq) must also stop.
823 * can't flush_scheduled_work() until we drop rtnl (later),
824 * else workers could deadlock; so make workers a NOP.
825 */
826 dev->flags = 0;
827 del_timer_sync (&dev->delay);
828 tasklet_kill (&dev->bh);
829 if (info->manage_power &&
830 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
831 info->manage_power(dev, 0);
832 else
833 usb_autopm_put_interface(dev->intf);
834
835 return 0;
836 }
837 EXPORT_SYMBOL_GPL(usbnet_stop);
838
839 /*-------------------------------------------------------------------------*/
840
841 // posts reads, and enables write queuing
842
843 // precondition: never called in_interrupt
844
845 int usbnet_open (struct net_device *net)
846 {
847 struct usbnet *dev = netdev_priv(net);
848 int retval;
849 struct driver_info *info = dev->driver_info;
850
851 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
852 netif_info(dev, ifup, dev->net,
853 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
854 retval,
855 dev->udev->bus->bus_name,
856 dev->udev->devpath,
857 info->description);
858 goto done_nopm;
859 }
860
861 // put into "known safe" state
862 if (info->reset && (retval = info->reset (dev)) < 0) {
863 netif_info(dev, ifup, dev->net,
864 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
865 retval,
866 dev->udev->bus->bus_name,
867 dev->udev->devpath,
868 info->description);
869 goto done;
870 }
871
872 /* hard_mtu or rx_urb_size may change in reset() */
873 usbnet_update_max_qlen(dev);
874
875 // insist peer be connected
876 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
877 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
878 goto done;
879 }
880
881 /* start any status interrupt transfer */
882 if (dev->interrupt) {
883 retval = usbnet_status_start(dev, GFP_KERNEL);
884 if (retval < 0) {
885 netif_err(dev, ifup, dev->net,
886 "intr submit %d\n", retval);
887 goto done;
888 }
889 }
890
891 set_bit(EVENT_DEV_OPEN, &dev->flags);
892 netif_start_queue (net);
893 netif_info(dev, ifup, dev->net,
894 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
895 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
896 dev->net->mtu,
897 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
898 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
899 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
900 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
901 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
902 "simple");
903
904 /* reset rx error state */
905 dev->pkt_cnt = 0;
906 dev->pkt_err = 0;
907 clear_bit(EVENT_RX_KILL, &dev->flags);
908
909 // delay posting reads until we're fully open
910 tasklet_schedule (&dev->bh);
911 if (info->manage_power) {
912 retval = info->manage_power(dev, 1);
913 if (retval < 0) {
914 retval = 0;
915 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
916 } else {
917 usb_autopm_put_interface(dev->intf);
918 }
919 }
920 return retval;
921 done:
922 usb_autopm_put_interface(dev->intf);
923 done_nopm:
924 return retval;
925 }
926 EXPORT_SYMBOL_GPL(usbnet_open);
927
928 /*-------------------------------------------------------------------------*/
929
930 /* ethtool methods; minidrivers may need to add some more, but
931 * they'll probably want to use this base set.
932 */
933
934 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
935 {
936 struct usbnet *dev = netdev_priv(net);
937
938 if (!dev->mii.mdio_read)
939 return -EOPNOTSUPP;
940
941 return mii_ethtool_gset(&dev->mii, cmd);
942 }
943 EXPORT_SYMBOL_GPL(usbnet_get_settings);
944
945 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
946 {
947 struct usbnet *dev = netdev_priv(net);
948 int retval;
949
950 if (!dev->mii.mdio_write)
951 return -EOPNOTSUPP;
952
953 retval = mii_ethtool_sset(&dev->mii, cmd);
954
955 /* link speed/duplex might have changed */
956 if (dev->driver_info->link_reset)
957 dev->driver_info->link_reset(dev);
958
959 /* hard_mtu or rx_urb_size may change in link_reset() */
960 usbnet_update_max_qlen(dev);
961
962 return retval;
963
964 }
965 EXPORT_SYMBOL_GPL(usbnet_set_settings);
966
967 u32 usbnet_get_link (struct net_device *net)
968 {
969 struct usbnet *dev = netdev_priv(net);
970
971 /* If a check_connect is defined, return its result */
972 if (dev->driver_info->check_connect)
973 return dev->driver_info->check_connect (dev) == 0;
974
975 /* if the device has mii operations, use those */
976 if (dev->mii.mdio_read)
977 return mii_link_ok(&dev->mii);
978
979 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
980 return ethtool_op_get_link(net);
981 }
982 EXPORT_SYMBOL_GPL(usbnet_get_link);
983
984 int usbnet_nway_reset(struct net_device *net)
985 {
986 struct usbnet *dev = netdev_priv(net);
987
988 if (!dev->mii.mdio_write)
989 return -EOPNOTSUPP;
990
991 return mii_nway_restart(&dev->mii);
992 }
993 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
994
995 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
996 {
997 struct usbnet *dev = netdev_priv(net);
998
999 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1000 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1001 strlcpy (info->fw_version, dev->driver_info->description,
1002 sizeof info->fw_version);
1003 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1004 }
1005 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1006
1007 u32 usbnet_get_msglevel (struct net_device *net)
1008 {
1009 struct usbnet *dev = netdev_priv(net);
1010
1011 return dev->msg_enable;
1012 }
1013 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1014
1015 void usbnet_set_msglevel (struct net_device *net, u32 level)
1016 {
1017 struct usbnet *dev = netdev_priv(net);
1018
1019 dev->msg_enable = level;
1020 }
1021 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1022
1023 /* drivers may override default ethtool_ops in their bind() routine */
1024 static const struct ethtool_ops usbnet_ethtool_ops = {
1025 .get_settings = usbnet_get_settings,
1026 .set_settings = usbnet_set_settings,
1027 .get_link = usbnet_get_link,
1028 .nway_reset = usbnet_nway_reset,
1029 .get_drvinfo = usbnet_get_drvinfo,
1030 .get_msglevel = usbnet_get_msglevel,
1031 .set_msglevel = usbnet_set_msglevel,
1032 .get_ts_info = ethtool_op_get_ts_info,
1033 };
1034
1035 /*-------------------------------------------------------------------------*/
1036
1037 static void __handle_link_change(struct usbnet *dev)
1038 {
1039 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1040 return;
1041
1042 if (!netif_carrier_ok(dev->net)) {
1043 /* kill URBs for reading packets to save bus bandwidth */
1044 unlink_urbs(dev, &dev->rxq);
1045
1046 /*
1047 * tx_timeout will unlink URBs for sending packets and
1048 * tx queue is stopped by netcore after link becomes off
1049 */
1050 } else {
1051 /* submitting URBs for reading packets */
1052 tasklet_schedule(&dev->bh);
1053 }
1054
1055 /* hard_mtu or rx_urb_size may change during link change */
1056 usbnet_update_max_qlen(dev);
1057
1058 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1059 }
1060
1061 /* work that cannot be done in interrupt context uses keventd.
1062 *
1063 * NOTE: with 2.5 we could do more of this using completion callbacks,
1064 * especially now that control transfers can be queued.
1065 */
1066 static void
1067 kevent (struct work_struct *work)
1068 {
1069 struct usbnet *dev =
1070 container_of(work, struct usbnet, kevent);
1071 int status;
1072
1073 /* usb_clear_halt() needs a thread context */
1074 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1075 unlink_urbs (dev, &dev->txq);
1076 status = usb_autopm_get_interface(dev->intf);
1077 if (status < 0)
1078 goto fail_pipe;
1079 status = usb_clear_halt (dev->udev, dev->out);
1080 usb_autopm_put_interface(dev->intf);
1081 if (status < 0 &&
1082 status != -EPIPE &&
1083 status != -ESHUTDOWN) {
1084 if (netif_msg_tx_err (dev))
1085 fail_pipe:
1086 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1087 status);
1088 } else {
1089 clear_bit (EVENT_TX_HALT, &dev->flags);
1090 if (status != -ESHUTDOWN)
1091 netif_wake_queue (dev->net);
1092 }
1093 }
1094 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1095 unlink_urbs (dev, &dev->rxq);
1096 status = usb_autopm_get_interface(dev->intf);
1097 if (status < 0)
1098 goto fail_halt;
1099 status = usb_clear_halt (dev->udev, dev->in);
1100 usb_autopm_put_interface(dev->intf);
1101 if (status < 0 &&
1102 status != -EPIPE &&
1103 status != -ESHUTDOWN) {
1104 if (netif_msg_rx_err (dev))
1105 fail_halt:
1106 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1107 status);
1108 } else {
1109 clear_bit (EVENT_RX_HALT, &dev->flags);
1110 tasklet_schedule (&dev->bh);
1111 }
1112 }
1113
1114 /* tasklet could resubmit itself forever if memory is tight */
1115 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1116 struct urb *urb = NULL;
1117 int resched = 1;
1118
1119 if (netif_running (dev->net))
1120 urb = usb_alloc_urb (0, GFP_KERNEL);
1121 else
1122 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1123 if (urb != NULL) {
1124 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1125 status = usb_autopm_get_interface(dev->intf);
1126 if (status < 0) {
1127 usb_free_urb(urb);
1128 goto fail_lowmem;
1129 }
1130 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1131 resched = 0;
1132 usb_autopm_put_interface(dev->intf);
1133 fail_lowmem:
1134 if (resched)
1135 tasklet_schedule (&dev->bh);
1136 }
1137 }
1138
1139 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1140 struct driver_info *info = dev->driver_info;
1141 int retval = 0;
1142
1143 clear_bit (EVENT_LINK_RESET, &dev->flags);
1144 status = usb_autopm_get_interface(dev->intf);
1145 if (status < 0)
1146 goto skip_reset;
1147 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1148 usb_autopm_put_interface(dev->intf);
1149 skip_reset:
1150 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1151 retval,
1152 dev->udev->bus->bus_name,
1153 dev->udev->devpath,
1154 info->description);
1155 } else {
1156 usb_autopm_put_interface(dev->intf);
1157 }
1158
1159 /* handle link change from link resetting */
1160 __handle_link_change(dev);
1161 }
1162
1163 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1164 __handle_link_change(dev);
1165
1166 if (dev->flags)
1167 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1168 }
1169
1170 /*-------------------------------------------------------------------------*/
1171
1172 static void tx_complete (struct urb *urb)
1173 {
1174 struct sk_buff *skb = (struct sk_buff *) urb->context;
1175 struct skb_data *entry = (struct skb_data *) skb->cb;
1176 struct usbnet *dev = entry->dev;
1177
1178 if (urb->status == 0) {
1179 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1180 dev->net->stats.tx_packets++;
1181 dev->net->stats.tx_bytes += entry->length;
1182 } else {
1183 dev->net->stats.tx_errors++;
1184
1185 switch (urb->status) {
1186 case -EPIPE:
1187 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1188 break;
1189
1190 /* software-driven interface shutdown */
1191 case -ECONNRESET: // async unlink
1192 case -ESHUTDOWN: // hardware gone
1193 break;
1194
1195 // like rx, tx gets controller i/o faults during khubd delays
1196 // and so it uses the same throttling mechanism.
1197 case -EPROTO:
1198 case -ETIME:
1199 case -EILSEQ:
1200 usb_mark_last_busy(dev->udev);
1201 if (!timer_pending (&dev->delay)) {
1202 mod_timer (&dev->delay,
1203 jiffies + THROTTLE_JIFFIES);
1204 netif_dbg(dev, link, dev->net,
1205 "tx throttle %d\n", urb->status);
1206 }
1207 netif_stop_queue (dev->net);
1208 break;
1209 default:
1210 netif_dbg(dev, tx_err, dev->net,
1211 "tx err %d\n", entry->urb->status);
1212 break;
1213 }
1214 }
1215
1216 usb_autopm_put_interface_async(dev->intf);
1217 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1218 }
1219
1220 /*-------------------------------------------------------------------------*/
1221
1222 void usbnet_tx_timeout (struct net_device *net)
1223 {
1224 struct usbnet *dev = netdev_priv(net);
1225
1226 unlink_urbs (dev, &dev->txq);
1227 tasklet_schedule (&dev->bh);
1228
1229 // FIXME: device recovery -- reset?
1230 }
1231 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1232
1233 /*-------------------------------------------------------------------------*/
1234
1235 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1236 {
1237 unsigned num_sgs, total_len = 0;
1238 int i, s = 0;
1239
1240 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1241 if (num_sgs == 1)
1242 return 0;
1243
1244 urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist), GFP_ATOMIC);
1245 if (!urb->sg)
1246 return -ENOMEM;
1247
1248 urb->num_sgs = num_sgs;
1249 sg_init_table(urb->sg, urb->num_sgs);
1250
1251 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1252 total_len += skb_headlen(skb);
1253
1254 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1255 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1256
1257 total_len += skb_frag_size(f);
1258 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1259 f->page_offset);
1260 }
1261 urb->transfer_buffer_length = total_len;
1262
1263 return 1;
1264 }
1265
1266 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1267 struct net_device *net)
1268 {
1269 struct usbnet *dev = netdev_priv(net);
1270 int length;
1271 struct urb *urb = NULL;
1272 struct skb_data *entry;
1273 struct driver_info *info = dev->driver_info;
1274 unsigned long flags;
1275 int retval;
1276
1277 if (skb)
1278 skb_tx_timestamp(skb);
1279
1280 // some devices want funky USB-level framing, for
1281 // win32 driver (usually) and/or hardware quirks
1282 if (info->tx_fixup) {
1283 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1284 if (!skb) {
1285 /* packet collected; minidriver waiting for more */
1286 if (info->flags & FLAG_MULTI_PACKET)
1287 goto not_drop;
1288 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1289 goto drop;
1290 }
1291 }
1292
1293 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1294 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1295 goto drop;
1296 }
1297
1298 entry = (struct skb_data *) skb->cb;
1299 entry->urb = urb;
1300 entry->dev = dev;
1301
1302 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1303 skb->data, skb->len, tx_complete, skb);
1304 if (dev->can_dma_sg) {
1305 if (build_dma_sg(skb, urb) < 0)
1306 goto drop;
1307 }
1308 entry->length = length = urb->transfer_buffer_length;
1309
1310 /* don't assume the hardware handles USB_ZERO_PACKET
1311 * NOTE: strictly conforming cdc-ether devices should expect
1312 * the ZLP here, but ignore the one-byte packet.
1313 * NOTE2: CDC NCM specification is different from CDC ECM when
1314 * handling ZLP/short packets, so cdc_ncm driver will make short
1315 * packet itself if needed.
1316 */
1317 if (length % dev->maxpacket == 0) {
1318 if (!(info->flags & FLAG_SEND_ZLP)) {
1319 if (!(info->flags & FLAG_MULTI_PACKET)) {
1320 urb->transfer_buffer_length++;
1321 if (skb_tailroom(skb)) {
1322 skb->data[skb->len] = 0;
1323 __skb_put(skb, 1);
1324 }
1325 }
1326 } else
1327 urb->transfer_flags |= URB_ZERO_PACKET;
1328 }
1329
1330 spin_lock_irqsave(&dev->txq.lock, flags);
1331 retval = usb_autopm_get_interface_async(dev->intf);
1332 if (retval < 0) {
1333 spin_unlock_irqrestore(&dev->txq.lock, flags);
1334 goto drop;
1335 }
1336
1337 #ifdef CONFIG_PM
1338 /* if this triggers the device is still a sleep */
1339 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1340 /* transmission will be done in resume */
1341 usb_anchor_urb(urb, &dev->deferred);
1342 /* no use to process more packets */
1343 netif_stop_queue(net);
1344 usb_put_urb(urb);
1345 spin_unlock_irqrestore(&dev->txq.lock, flags);
1346 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1347 goto deferred;
1348 }
1349 #endif
1350
1351 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1352 case -EPIPE:
1353 netif_stop_queue (net);
1354 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1355 usb_autopm_put_interface_async(dev->intf);
1356 break;
1357 default:
1358 usb_autopm_put_interface_async(dev->intf);
1359 netif_dbg(dev, tx_err, dev->net,
1360 "tx: submit urb err %d\n", retval);
1361 break;
1362 case 0:
1363 net->trans_start = jiffies;
1364 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1365 if (dev->txq.qlen >= TX_QLEN (dev))
1366 netif_stop_queue (net);
1367 }
1368 spin_unlock_irqrestore (&dev->txq.lock, flags);
1369
1370 if (retval) {
1371 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1372 drop:
1373 dev->net->stats.tx_dropped++;
1374 not_drop:
1375 if (skb)
1376 dev_kfree_skb_any (skb);
1377 if (urb) {
1378 kfree(urb->sg);
1379 usb_free_urb(urb);
1380 }
1381 } else
1382 netif_dbg(dev, tx_queued, dev->net,
1383 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1384 #ifdef CONFIG_PM
1385 deferred:
1386 #endif
1387 return NETDEV_TX_OK;
1388 }
1389 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1390
1391 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1392 {
1393 struct urb *urb;
1394 int i;
1395 int ret = 0;
1396
1397 /* don't refill the queue all at once */
1398 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1399 urb = usb_alloc_urb(0, flags);
1400 if (urb != NULL) {
1401 ret = rx_submit(dev, urb, flags);
1402 if (ret)
1403 goto err;
1404 } else {
1405 ret = -ENOMEM;
1406 goto err;
1407 }
1408 }
1409 err:
1410 return ret;
1411 }
1412
1413 /*-------------------------------------------------------------------------*/
1414
1415 // tasklet (work deferred from completions, in_irq) or timer
1416
1417 static void usbnet_bh (unsigned long param)
1418 {
1419 struct usbnet *dev = (struct usbnet *) param;
1420 struct sk_buff *skb;
1421 struct skb_data *entry;
1422
1423 while ((skb = skb_dequeue (&dev->done))) {
1424 entry = (struct skb_data *) skb->cb;
1425 switch (entry->state) {
1426 case rx_done:
1427 entry->state = rx_cleanup;
1428 rx_process (dev, skb);
1429 continue;
1430 case tx_done:
1431 kfree(entry->urb->sg);
1432 case rx_cleanup:
1433 usb_free_urb (entry->urb);
1434 dev_kfree_skb (skb);
1435 continue;
1436 default:
1437 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1438 }
1439 }
1440
1441 /* restart RX again after disabling due to high error rate */
1442 clear_bit(EVENT_RX_KILL, &dev->flags);
1443
1444 // waiting for all pending urbs to complete?
1445 if (dev->wait) {
1446 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1447 wake_up (dev->wait);
1448 }
1449
1450 // or are we maybe short a few urbs?
1451 } else if (netif_running (dev->net) &&
1452 netif_device_present (dev->net) &&
1453 netif_carrier_ok(dev->net) &&
1454 !timer_pending (&dev->delay) &&
1455 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1456 int temp = dev->rxq.qlen;
1457
1458 if (temp < RX_QLEN(dev)) {
1459 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1460 return;
1461 if (temp != dev->rxq.qlen)
1462 netif_dbg(dev, link, dev->net,
1463 "rxqlen %d --> %d\n",
1464 temp, dev->rxq.qlen);
1465 if (dev->rxq.qlen < RX_QLEN(dev))
1466 tasklet_schedule (&dev->bh);
1467 }
1468 if (dev->txq.qlen < TX_QLEN (dev))
1469 netif_wake_queue (dev->net);
1470 }
1471 }
1472
1473
1474 /*-------------------------------------------------------------------------
1475 *
1476 * USB Device Driver support
1477 *
1478 *-------------------------------------------------------------------------*/
1479
1480 // precondition: never called in_interrupt
1481
1482 void usbnet_disconnect (struct usb_interface *intf)
1483 {
1484 struct usbnet *dev;
1485 struct usb_device *xdev;
1486 struct net_device *net;
1487
1488 dev = usb_get_intfdata(intf);
1489 usb_set_intfdata(intf, NULL);
1490 if (!dev)
1491 return;
1492
1493 xdev = interface_to_usbdev (intf);
1494
1495 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1496 intf->dev.driver->name,
1497 xdev->bus->bus_name, xdev->devpath,
1498 dev->driver_info->description);
1499
1500 net = dev->net;
1501 unregister_netdev (net);
1502
1503 cancel_work_sync(&dev->kevent);
1504
1505 usb_scuttle_anchored_urbs(&dev->deferred);
1506
1507 if (dev->driver_info->unbind)
1508 dev->driver_info->unbind (dev, intf);
1509
1510 usb_kill_urb(dev->interrupt);
1511 usb_free_urb(dev->interrupt);
1512
1513 free_netdev(net);
1514 }
1515 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1516
1517 static const struct net_device_ops usbnet_netdev_ops = {
1518 .ndo_open = usbnet_open,
1519 .ndo_stop = usbnet_stop,
1520 .ndo_start_xmit = usbnet_start_xmit,
1521 .ndo_tx_timeout = usbnet_tx_timeout,
1522 .ndo_change_mtu = usbnet_change_mtu,
1523 .ndo_set_mac_address = eth_mac_addr,
1524 .ndo_validate_addr = eth_validate_addr,
1525 };
1526
1527 /*-------------------------------------------------------------------------*/
1528
1529 // precondition: never called in_interrupt
1530
1531 static struct device_type wlan_type = {
1532 .name = "wlan",
1533 };
1534
1535 static struct device_type wwan_type = {
1536 .name = "wwan",
1537 };
1538
1539 int
1540 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1541 {
1542 struct usbnet *dev;
1543 struct net_device *net;
1544 struct usb_host_interface *interface;
1545 struct driver_info *info;
1546 struct usb_device *xdev;
1547 int status;
1548 const char *name;
1549 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1550
1551 /* usbnet already took usb runtime pm, so have to enable the feature
1552 * for usb interface, otherwise usb_autopm_get_interface may return
1553 * failure if RUNTIME_PM is enabled.
1554 */
1555 if (!driver->supports_autosuspend) {
1556 driver->supports_autosuspend = 1;
1557 pm_runtime_enable(&udev->dev);
1558 }
1559
1560 name = udev->dev.driver->name;
1561 info = (struct driver_info *) prod->driver_info;
1562 if (!info) {
1563 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1564 return -ENODEV;
1565 }
1566 xdev = interface_to_usbdev (udev);
1567 interface = udev->cur_altsetting;
1568
1569 status = -ENOMEM;
1570
1571 // set up our own records
1572 net = alloc_etherdev(sizeof(*dev));
1573 if (!net)
1574 goto out;
1575
1576 /* netdev_printk() needs this so do it as early as possible */
1577 SET_NETDEV_DEV(net, &udev->dev);
1578
1579 dev = netdev_priv(net);
1580 dev->udev = xdev;
1581 dev->intf = udev;
1582 dev->driver_info = info;
1583 dev->driver_name = name;
1584 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1585 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1586 skb_queue_head_init (&dev->rxq);
1587 skb_queue_head_init (&dev->txq);
1588 skb_queue_head_init (&dev->done);
1589 skb_queue_head_init(&dev->rxq_pause);
1590 dev->bh.func = usbnet_bh;
1591 dev->bh.data = (unsigned long) dev;
1592 INIT_WORK (&dev->kevent, kevent);
1593 init_usb_anchor(&dev->deferred);
1594 dev->delay.function = usbnet_bh;
1595 dev->delay.data = (unsigned long) dev;
1596 init_timer (&dev->delay);
1597 mutex_init (&dev->phy_mutex);
1598 mutex_init(&dev->interrupt_mutex);
1599 dev->interrupt_count = 0;
1600
1601 dev->net = net;
1602 strcpy (net->name, "usb%d");
1603 memcpy (net->dev_addr, node_id, sizeof node_id);
1604
1605 /* rx and tx sides can use different message sizes;
1606 * bind() should set rx_urb_size in that case.
1607 */
1608 dev->hard_mtu = net->mtu + net->hard_header_len;
1609 #if 0
1610 // dma_supported() is deeply broken on almost all architectures
1611 // possible with some EHCI controllers
1612 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1613 net->features |= NETIF_F_HIGHDMA;
1614 #endif
1615
1616 net->netdev_ops = &usbnet_netdev_ops;
1617 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1618 net->ethtool_ops = &usbnet_ethtool_ops;
1619
1620 // allow device-specific bind/init procedures
1621 // NOTE net->name still not usable ...
1622 if (info->bind) {
1623 status = info->bind (dev, udev);
1624 if (status < 0)
1625 goto out1;
1626
1627 // heuristic: "usb%d" for links we know are two-host,
1628 // else "eth%d" when there's reasonable doubt. userspace
1629 // can rename the link if it knows better.
1630 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1631 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1632 (net->dev_addr [0] & 0x02) == 0))
1633 strcpy (net->name, "eth%d");
1634 /* WLAN devices should always be named "wlan%d" */
1635 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1636 strcpy(net->name, "wlan%d");
1637 /* WWAN devices should always be named "wwan%d" */
1638 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1639 strcpy(net->name, "wwan%d");
1640
1641 /* devices that cannot do ARP */
1642 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1643 net->flags |= IFF_NOARP;
1644
1645 /* maybe the remote can't receive an Ethernet MTU */
1646 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1647 net->mtu = dev->hard_mtu - net->hard_header_len;
1648 } else if (!info->in || !info->out)
1649 status = usbnet_get_endpoints (dev, udev);
1650 else {
1651 dev->in = usb_rcvbulkpipe (xdev, info->in);
1652 dev->out = usb_sndbulkpipe (xdev, info->out);
1653 if (!(info->flags & FLAG_NO_SETINT))
1654 status = usb_set_interface (xdev,
1655 interface->desc.bInterfaceNumber,
1656 interface->desc.bAlternateSetting);
1657 else
1658 status = 0;
1659
1660 }
1661 if (status >= 0 && dev->status)
1662 status = init_status (dev, udev);
1663 if (status < 0)
1664 goto out3;
1665
1666 if (!dev->rx_urb_size)
1667 dev->rx_urb_size = dev->hard_mtu;
1668 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1669
1670 /* let userspace know we have a random address */
1671 if (ether_addr_equal(net->dev_addr, node_id))
1672 net->addr_assign_type = NET_ADDR_RANDOM;
1673
1674 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1675 SET_NETDEV_DEVTYPE(net, &wlan_type);
1676 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1677 SET_NETDEV_DEVTYPE(net, &wwan_type);
1678
1679 /* initialize max rx_qlen and tx_qlen */
1680 usbnet_update_max_qlen(dev);
1681
1682 status = register_netdev (net);
1683 if (status)
1684 goto out4;
1685 netif_info(dev, probe, dev->net,
1686 "register '%s' at usb-%s-%s, %s, %pM\n",
1687 udev->dev.driver->name,
1688 xdev->bus->bus_name, xdev->devpath,
1689 dev->driver_info->description,
1690 net->dev_addr);
1691
1692 // ok, it's ready to go.
1693 usb_set_intfdata (udev, dev);
1694
1695 netif_device_attach (net);
1696
1697 if (dev->driver_info->flags & FLAG_LINK_INTR)
1698 usbnet_link_change(dev, 0, 0);
1699
1700 return 0;
1701
1702 out4:
1703 usb_free_urb(dev->interrupt);
1704 out3:
1705 if (info->unbind)
1706 info->unbind (dev, udev);
1707 out1:
1708 free_netdev(net);
1709 out:
1710 return status;
1711 }
1712 EXPORT_SYMBOL_GPL(usbnet_probe);
1713
1714 /*-------------------------------------------------------------------------*/
1715
1716 /*
1717 * suspend the whole driver as soon as the first interface is suspended
1718 * resume only when the last interface is resumed
1719 */
1720
1721 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1722 {
1723 struct usbnet *dev = usb_get_intfdata(intf);
1724
1725 if (!dev->suspend_count++) {
1726 spin_lock_irq(&dev->txq.lock);
1727 /* don't autosuspend while transmitting */
1728 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1729 dev->suspend_count--;
1730 spin_unlock_irq(&dev->txq.lock);
1731 return -EBUSY;
1732 } else {
1733 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1734 spin_unlock_irq(&dev->txq.lock);
1735 }
1736 /*
1737 * accelerate emptying of the rx and queues, to avoid
1738 * having everything error out.
1739 */
1740 netif_device_detach (dev->net);
1741 usbnet_terminate_urbs(dev);
1742 __usbnet_status_stop_force(dev);
1743
1744 /*
1745 * reattach so runtime management can use and
1746 * wake the device
1747 */
1748 netif_device_attach (dev->net);
1749 }
1750 return 0;
1751 }
1752 EXPORT_SYMBOL_GPL(usbnet_suspend);
1753
1754 int usbnet_resume (struct usb_interface *intf)
1755 {
1756 struct usbnet *dev = usb_get_intfdata(intf);
1757 struct sk_buff *skb;
1758 struct urb *res;
1759 int retval;
1760
1761 if (!--dev->suspend_count) {
1762 /* resume interrupt URB if it was previously submitted */
1763 __usbnet_status_start_force(dev, GFP_NOIO);
1764
1765 spin_lock_irq(&dev->txq.lock);
1766 while ((res = usb_get_from_anchor(&dev->deferred))) {
1767
1768 skb = (struct sk_buff *)res->context;
1769 retval = usb_submit_urb(res, GFP_ATOMIC);
1770 if (retval < 0) {
1771 dev_kfree_skb_any(skb);
1772 kfree(res->sg);
1773 usb_free_urb(res);
1774 usb_autopm_put_interface_async(dev->intf);
1775 } else {
1776 dev->net->trans_start = jiffies;
1777 __skb_queue_tail(&dev->txq, skb);
1778 }
1779 }
1780
1781 smp_mb();
1782 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1783 spin_unlock_irq(&dev->txq.lock);
1784
1785 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1786 /* handle remote wakeup ASAP */
1787 if (!dev->wait &&
1788 netif_device_present(dev->net) &&
1789 !timer_pending(&dev->delay) &&
1790 !test_bit(EVENT_RX_HALT, &dev->flags))
1791 rx_alloc_submit(dev, GFP_NOIO);
1792
1793 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1794 netif_tx_wake_all_queues(dev->net);
1795 tasklet_schedule (&dev->bh);
1796 }
1797 }
1798
1799 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1800 usb_autopm_get_interface_no_resume(intf);
1801
1802 return 0;
1803 }
1804 EXPORT_SYMBOL_GPL(usbnet_resume);
1805
1806 /*
1807 * Either a subdriver implements manage_power, then it is assumed to always
1808 * be ready to be suspended or it reports the readiness to be suspended
1809 * explicitly
1810 */
1811 void usbnet_device_suggests_idle(struct usbnet *dev)
1812 {
1813 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1814 dev->intf->needs_remote_wakeup = 1;
1815 usb_autopm_put_interface_async(dev->intf);
1816 }
1817 }
1818 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1819
1820 /*
1821 * For devices that can do without special commands
1822 */
1823 int usbnet_manage_power(struct usbnet *dev, int on)
1824 {
1825 dev->intf->needs_remote_wakeup = on;
1826 return 0;
1827 }
1828 EXPORT_SYMBOL(usbnet_manage_power);
1829
1830 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1831 {
1832 /* update link after link is reseted */
1833 if (link && !need_reset)
1834 netif_carrier_on(dev->net);
1835 else
1836 netif_carrier_off(dev->net);
1837
1838 if (need_reset && link)
1839 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1840 else
1841 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1842 }
1843 EXPORT_SYMBOL(usbnet_link_change);
1844
1845 /*-------------------------------------------------------------------------*/
1846 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1847 u16 value, u16 index, void *data, u16 size)
1848 {
1849 void *buf = NULL;
1850 int err = -ENOMEM;
1851
1852 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1853 " value=0x%04x index=0x%04x size=%d\n",
1854 cmd, reqtype, value, index, size);
1855
1856 if (data) {
1857 buf = kmalloc(size, GFP_KERNEL);
1858 if (!buf)
1859 goto out;
1860 }
1861
1862 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1863 cmd, reqtype, value, index, buf, size,
1864 USB_CTRL_GET_TIMEOUT);
1865 if (err > 0 && err <= size)
1866 memcpy(data, buf, err);
1867 kfree(buf);
1868 out:
1869 return err;
1870 }
1871
1872 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1873 u16 value, u16 index, const void *data,
1874 u16 size)
1875 {
1876 void *buf = NULL;
1877 int err = -ENOMEM;
1878
1879 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1880 " value=0x%04x index=0x%04x size=%d\n",
1881 cmd, reqtype, value, index, size);
1882
1883 if (data) {
1884 buf = kmemdup(data, size, GFP_KERNEL);
1885 if (!buf)
1886 goto out;
1887 }
1888
1889 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1890 cmd, reqtype, value, index, buf, size,
1891 USB_CTRL_SET_TIMEOUT);
1892 kfree(buf);
1893
1894 out:
1895 return err;
1896 }
1897
1898 /*
1899 * The function can't be called inside suspend/resume callback,
1900 * otherwise deadlock will be caused.
1901 */
1902 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1903 u16 value, u16 index, void *data, u16 size)
1904 {
1905 int ret;
1906
1907 if (usb_autopm_get_interface(dev->intf) < 0)
1908 return -ENODEV;
1909 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1910 data, size);
1911 usb_autopm_put_interface(dev->intf);
1912 return ret;
1913 }
1914 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1915
1916 /*
1917 * The function can't be called inside suspend/resume callback,
1918 * otherwise deadlock will be caused.
1919 */
1920 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1921 u16 value, u16 index, const void *data, u16 size)
1922 {
1923 int ret;
1924
1925 if (usb_autopm_get_interface(dev->intf) < 0)
1926 return -ENODEV;
1927 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1928 data, size);
1929 usb_autopm_put_interface(dev->intf);
1930 return ret;
1931 }
1932 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1933
1934 /*
1935 * The function can be called inside suspend/resume callback safely
1936 * and should only be called by suspend/resume callback generally.
1937 */
1938 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1939 u16 value, u16 index, void *data, u16 size)
1940 {
1941 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1942 data, size);
1943 }
1944 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1945
1946 /*
1947 * The function can be called inside suspend/resume callback safely
1948 * and should only be called by suspend/resume callback generally.
1949 */
1950 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1951 u16 value, u16 index, const void *data,
1952 u16 size)
1953 {
1954 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1955 data, size);
1956 }
1957 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1958
1959 static void usbnet_async_cmd_cb(struct urb *urb)
1960 {
1961 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1962 int status = urb->status;
1963
1964 if (status < 0)
1965 dev_dbg(&urb->dev->dev, "%s failed with %d",
1966 __func__, status);
1967
1968 kfree(req);
1969 usb_free_urb(urb);
1970 }
1971
1972 /*
1973 * The caller must make sure that device can't be put into suspend
1974 * state until the control URB completes.
1975 */
1976 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1977 u16 value, u16 index, const void *data, u16 size)
1978 {
1979 struct usb_ctrlrequest *req = NULL;
1980 struct urb *urb;
1981 int err = -ENOMEM;
1982 void *buf = NULL;
1983
1984 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1985 " value=0x%04x index=0x%04x size=%d\n",
1986 cmd, reqtype, value, index, size);
1987
1988 urb = usb_alloc_urb(0, GFP_ATOMIC);
1989 if (!urb) {
1990 netdev_err(dev->net, "Error allocating URB in"
1991 " %s!\n", __func__);
1992 goto fail;
1993 }
1994
1995 if (data) {
1996 buf = kmemdup(data, size, GFP_ATOMIC);
1997 if (!buf) {
1998 netdev_err(dev->net, "Error allocating buffer"
1999 " in %s!\n", __func__);
2000 goto fail_free;
2001 }
2002 }
2003
2004 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2005 if (!req)
2006 goto fail_free_buf;
2007
2008 req->bRequestType = reqtype;
2009 req->bRequest = cmd;
2010 req->wValue = cpu_to_le16(value);
2011 req->wIndex = cpu_to_le16(index);
2012 req->wLength = cpu_to_le16(size);
2013
2014 usb_fill_control_urb(urb, dev->udev,
2015 usb_sndctrlpipe(dev->udev, 0),
2016 (void *)req, buf, size,
2017 usbnet_async_cmd_cb, req);
2018 urb->transfer_flags |= URB_FREE_BUFFER;
2019
2020 err = usb_submit_urb(urb, GFP_ATOMIC);
2021 if (err < 0) {
2022 netdev_err(dev->net, "Error submitting the control"
2023 " message: status=%d\n", err);
2024 goto fail_free;
2025 }
2026 return 0;
2027
2028 fail_free_buf:
2029 kfree(buf);
2030 fail_free:
2031 kfree(req);
2032 usb_free_urb(urb);
2033 fail:
2034 return err;
2035
2036 }
2037 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2038 /*-------------------------------------------------------------------------*/
2039
2040 static int __init usbnet_init(void)
2041 {
2042 /* Compiler should optimize this out. */
2043 BUILD_BUG_ON(
2044 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2045
2046 eth_random_addr(node_id);
2047 return 0;
2048 }
2049 module_init(usbnet_init);
2050
2051 static void __exit usbnet_exit(void)
2052 {
2053 }
2054 module_exit(usbnet_exit);
2055
2056 MODULE_AUTHOR("David Brownell");
2057 MODULE_DESCRIPTION("USB network driver framework");
2058 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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