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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[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, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
24 *
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
31
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/slab.h>
46 #include <linux/kernel.h>
47 #include <linux/pm_runtime.h>
48
49 #define DRIVER_VERSION "22-Aug-2005"
50
51
52 /*-------------------------------------------------------------------------*/
53
54 /*
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
60 *
61 * The goal is to let the USB host controller be busy for 5msec or
62 * more before an irq is required, under load. Jumbograms change
63 * the equation.
64 */
65 #define MAX_QUEUE_MEMORY (60 * 1518)
66 #define RX_QLEN(dev) ((dev)->rx_qlen)
67 #define TX_QLEN(dev) ((dev)->tx_qlen)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
73 * us (it polls at HZ/4 usually) before we report too many false errors.
74 */
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 = -1, ret;
164 unsigned char buf [13];
165
166 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
167 if (ret == 12)
168 tmp = hex2bin(dev->net->dev_addr, buf, 6);
169 if (tmp < 0) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (ret >= 0)
173 ret = -EINVAL;
174 return ret;
175 }
176 return 0;
177 }
178 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
179
180 static void intr_complete (struct urb *urb)
181 {
182 struct usbnet *dev = urb->context;
183 int status = urb->status;
184
185 switch (status) {
186 /* success */
187 case 0:
188 dev->driver_info->status(dev, urb);
189 break;
190
191 /* software-driven interface shutdown */
192 case -ENOENT: /* urb killed */
193 case -ESHUTDOWN: /* hardware gone */
194 netif_dbg(dev, ifdown, dev->net,
195 "intr shutdown, code %d\n", status);
196 return;
197
198 /* NOTE: not throttling like RX/TX, since this endpoint
199 * already polls infrequently
200 */
201 default:
202 netdev_dbg(dev->net, "intr status %d\n", status);
203 break;
204 }
205
206 status = usb_submit_urb (urb, GFP_ATOMIC);
207 if (status != 0)
208 netif_err(dev, timer, dev->net,
209 "intr resubmit --> %d\n", status);
210 }
211
212 static int init_status (struct usbnet *dev, struct usb_interface *intf)
213 {
214 char *buf = NULL;
215 unsigned pipe = 0;
216 unsigned maxp;
217 unsigned period;
218
219 if (!dev->driver_info->status)
220 return 0;
221
222 pipe = usb_rcvintpipe (dev->udev,
223 dev->status->desc.bEndpointAddress
224 & USB_ENDPOINT_NUMBER_MASK);
225 maxp = usb_maxpacket (dev->udev, pipe, 0);
226
227 /* avoid 1 msec chatter: min 8 msec poll rate */
228 period = max ((int) dev->status->desc.bInterval,
229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
230
231 buf = kmalloc (maxp, GFP_KERNEL);
232 if (buf) {
233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
234 if (!dev->interrupt) {
235 kfree (buf);
236 return -ENOMEM;
237 } else {
238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
239 buf, maxp, intr_complete, dev, period);
240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
241 dev_dbg(&intf->dev,
242 "status ep%din, %d bytes period %d\n",
243 usb_pipeendpoint(pipe), maxp, period);
244 }
245 }
246 return 0;
247 }
248
249 /* Submit the interrupt URB if not previously submitted, increasing refcount */
250 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
251 {
252 int ret = 0;
253
254 WARN_ON_ONCE(dev->interrupt == NULL);
255 if (dev->interrupt) {
256 mutex_lock(&dev->interrupt_mutex);
257
258 if (++dev->interrupt_count == 1)
259 ret = usb_submit_urb(dev->interrupt, mem_flags);
260
261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
262 dev->interrupt_count);
263 mutex_unlock(&dev->interrupt_mutex);
264 }
265 return ret;
266 }
267 EXPORT_SYMBOL_GPL(usbnet_status_start);
268
269 /* For resume; submit interrupt URB if previously submitted */
270 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
271 {
272 int ret = 0;
273
274 mutex_lock(&dev->interrupt_mutex);
275 if (dev->interrupt_count) {
276 ret = usb_submit_urb(dev->interrupt, mem_flags);
277 dev_dbg(&dev->udev->dev,
278 "submitted interrupt URB for resume\n");
279 }
280 mutex_unlock(&dev->interrupt_mutex);
281 return ret;
282 }
283
284 /* Kill the interrupt URB if all submitters want it killed */
285 void usbnet_status_stop(struct usbnet *dev)
286 {
287 if (dev->interrupt) {
288 mutex_lock(&dev->interrupt_mutex);
289 WARN_ON(dev->interrupt_count == 0);
290
291 if (dev->interrupt_count && --dev->interrupt_count == 0)
292 usb_kill_urb(dev->interrupt);
293
294 dev_dbg(&dev->udev->dev,
295 "decremented interrupt URB count to %d\n",
296 dev->interrupt_count);
297 mutex_unlock(&dev->interrupt_mutex);
298 }
299 }
300 EXPORT_SYMBOL_GPL(usbnet_status_stop);
301
302 /* For suspend; always kill interrupt URB */
303 static void __usbnet_status_stop_force(struct usbnet *dev)
304 {
305 if (dev->interrupt) {
306 mutex_lock(&dev->interrupt_mutex);
307 usb_kill_urb(dev->interrupt);
308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
309 mutex_unlock(&dev->interrupt_mutex);
310 }
311 }
312
313 /* Passes this packet up the stack, updating its accounting.
314 * Some link protocols batch packets, so their rx_fixup paths
315 * can return clones as well as just modify the original skb.
316 */
317 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
318 {
319 int status;
320
321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
322 skb_queue_tail(&dev->rxq_pause, skb);
323 return;
324 }
325
326 skb->protocol = eth_type_trans (skb, dev->net);
327 dev->net->stats.rx_packets++;
328 dev->net->stats.rx_bytes += skb->len;
329
330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
331 skb->len + sizeof (struct ethhdr), skb->protocol);
332 memset (skb->cb, 0, sizeof (struct skb_data));
333
334 if (skb_defer_rx_timestamp(skb))
335 return;
336
337 status = netif_rx (skb);
338 if (status != NET_RX_SUCCESS)
339 netif_dbg(dev, rx_err, dev->net,
340 "netif_rx status %d\n", status);
341 }
342 EXPORT_SYMBOL_GPL(usbnet_skb_return);
343
344 /* must be called if hard_mtu or rx_urb_size changed */
345 void usbnet_update_max_qlen(struct usbnet *dev)
346 {
347 enum usb_device_speed speed = dev->udev->speed;
348
349 switch (speed) {
350 case USB_SPEED_HIGH:
351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
353 break;
354 case USB_SPEED_SUPER:
355 /*
356 * Not take default 5ms qlen for super speed HC to
357 * save memory, and iperf tests show 2.5ms qlen can
358 * work well
359 */
360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
362 break;
363 default:
364 dev->rx_qlen = dev->tx_qlen = 4;
365 }
366 }
367 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
368
369 \f
370 /*-------------------------------------------------------------------------
371 *
372 * Network Device Driver (peer link to "Host Device", from USB host)
373 *
374 *-------------------------------------------------------------------------*/
375
376 int usbnet_change_mtu (struct net_device *net, int new_mtu)
377 {
378 struct usbnet *dev = netdev_priv(net);
379 int ll_mtu = new_mtu + net->hard_header_len;
380 int old_hard_mtu = dev->hard_mtu;
381 int old_rx_urb_size = dev->rx_urb_size;
382
383 if (new_mtu <= 0)
384 return -EINVAL;
385 // no second zero-length packet read wanted after mtu-sized packets
386 if ((ll_mtu % dev->maxpacket) == 0)
387 return -EDOM;
388 net->mtu = new_mtu;
389
390 dev->hard_mtu = net->mtu + net->hard_header_len;
391 if (dev->rx_urb_size == old_hard_mtu) {
392 dev->rx_urb_size = dev->hard_mtu;
393 if (dev->rx_urb_size > old_rx_urb_size)
394 usbnet_unlink_rx_urbs(dev);
395 }
396
397 /* max qlen depend on hard_mtu and rx_urb_size */
398 usbnet_update_max_qlen(dev);
399
400 return 0;
401 }
402 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
403
404 /* The caller must hold list->lock */
405 static void __usbnet_queue_skb(struct sk_buff_head *list,
406 struct sk_buff *newsk, enum skb_state state)
407 {
408 struct skb_data *entry = (struct skb_data *) newsk->cb;
409
410 __skb_queue_tail(list, newsk);
411 entry->state = state;
412 }
413
414 /*-------------------------------------------------------------------------*/
415
416 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
417 * completion callbacks. 2.5 should have fixed those bugs...
418 */
419
420 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
421 struct sk_buff_head *list, enum skb_state state)
422 {
423 unsigned long flags;
424 enum skb_state old_state;
425 struct skb_data *entry = (struct skb_data *) skb->cb;
426
427 spin_lock_irqsave(&list->lock, flags);
428 old_state = entry->state;
429 entry->state = state;
430 __skb_unlink(skb, list);
431 spin_unlock(&list->lock);
432 spin_lock(&dev->done.lock);
433 __skb_queue_tail(&dev->done, skb);
434 if (dev->done.qlen == 1)
435 tasklet_schedule(&dev->bh);
436 spin_unlock_irqrestore(&dev->done.lock, flags);
437 return old_state;
438 }
439
440 /* some work can't be done in tasklets, so we use keventd
441 *
442 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
443 * but tasklet_schedule() doesn't. hope the failure is rare.
444 */
445 void usbnet_defer_kevent (struct usbnet *dev, int work)
446 {
447 set_bit (work, &dev->flags);
448 if (!schedule_work (&dev->kevent)) {
449 if (net_ratelimit())
450 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
451 } else {
452 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
453 }
454 }
455 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
456
457 /*-------------------------------------------------------------------------*/
458
459 static void rx_complete (struct urb *urb);
460
461 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
462 {
463 struct sk_buff *skb;
464 struct skb_data *entry;
465 int retval = 0;
466 unsigned long lockflags;
467 size_t size = dev->rx_urb_size;
468
469 /* prevent rx skb allocation when error ratio is high */
470 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
471 usb_free_urb(urb);
472 return -ENOLINK;
473 }
474
475 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
476 if (!skb) {
477 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
478 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
479 usb_free_urb (urb);
480 return -ENOMEM;
481 }
482
483 entry = (struct skb_data *) skb->cb;
484 entry->urb = urb;
485 entry->dev = dev;
486 entry->length = 0;
487
488 usb_fill_bulk_urb (urb, dev->udev, dev->in,
489 skb->data, size, rx_complete, skb);
490
491 spin_lock_irqsave (&dev->rxq.lock, lockflags);
492
493 if (netif_running (dev->net) &&
494 netif_device_present (dev->net) &&
495 !test_bit (EVENT_RX_HALT, &dev->flags) &&
496 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
497 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
498 case -EPIPE:
499 usbnet_defer_kevent (dev, EVENT_RX_HALT);
500 break;
501 case -ENOMEM:
502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
503 break;
504 case -ENODEV:
505 netif_dbg(dev, ifdown, dev->net, "device gone\n");
506 netif_device_detach (dev->net);
507 break;
508 case -EHOSTUNREACH:
509 retval = -ENOLINK;
510 break;
511 default:
512 netif_dbg(dev, rx_err, dev->net,
513 "rx submit, %d\n", retval);
514 tasklet_schedule (&dev->bh);
515 break;
516 case 0:
517 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
518 }
519 } else {
520 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
521 retval = -ENOLINK;
522 }
523 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
524 if (retval) {
525 dev_kfree_skb_any (skb);
526 usb_free_urb (urb);
527 }
528 return retval;
529 }
530
531
532 /*-------------------------------------------------------------------------*/
533
534 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
535 {
536 if (dev->driver_info->rx_fixup &&
537 !dev->driver_info->rx_fixup (dev, skb)) {
538 /* With RX_ASSEMBLE, rx_fixup() must update counters */
539 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
540 dev->net->stats.rx_errors++;
541 goto done;
542 }
543 // else network stack removes extra byte if we forced a short packet
544
545 /* all data was already cloned from skb inside the driver */
546 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
547 goto done;
548
549 if (skb->len < ETH_HLEN) {
550 dev->net->stats.rx_errors++;
551 dev->net->stats.rx_length_errors++;
552 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
553 } else {
554 usbnet_skb_return(dev, skb);
555 return;
556 }
557
558 done:
559 skb_queue_tail(&dev->done, skb);
560 }
561
562 /*-------------------------------------------------------------------------*/
563
564 static void rx_complete (struct urb *urb)
565 {
566 struct sk_buff *skb = (struct sk_buff *) urb->context;
567 struct skb_data *entry = (struct skb_data *) skb->cb;
568 struct usbnet *dev = entry->dev;
569 int urb_status = urb->status;
570 enum skb_state state;
571
572 skb_put (skb, urb->actual_length);
573 state = rx_done;
574 entry->urb = NULL;
575
576 switch (urb_status) {
577 /* success */
578 case 0:
579 break;
580
581 /* stalls need manual reset. this is rare ... except that
582 * when going through USB 2.0 TTs, unplug appears this way.
583 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
584 * storm, recovering as needed.
585 */
586 case -EPIPE:
587 dev->net->stats.rx_errors++;
588 usbnet_defer_kevent (dev, EVENT_RX_HALT);
589 // FALLTHROUGH
590
591 /* software-driven interface shutdown */
592 case -ECONNRESET: /* async unlink */
593 case -ESHUTDOWN: /* hardware gone */
594 netif_dbg(dev, ifdown, dev->net,
595 "rx shutdown, code %d\n", urb_status);
596 goto block;
597
598 /* we get controller i/o faults during hub_wq disconnect() delays.
599 * throttle down resubmits, to avoid log floods; just temporarily,
600 * so we still recover when the fault isn't a hub_wq delay.
601 */
602 case -EPROTO:
603 case -ETIME:
604 case -EILSEQ:
605 dev->net->stats.rx_errors++;
606 if (!timer_pending (&dev->delay)) {
607 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
608 netif_dbg(dev, link, dev->net,
609 "rx throttle %d\n", urb_status);
610 }
611 block:
612 state = rx_cleanup;
613 entry->urb = urb;
614 urb = NULL;
615 break;
616
617 /* data overrun ... flush fifo? */
618 case -EOVERFLOW:
619 dev->net->stats.rx_over_errors++;
620 // FALLTHROUGH
621
622 default:
623 state = rx_cleanup;
624 dev->net->stats.rx_errors++;
625 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
626 break;
627 }
628
629 /* stop rx if packet error rate is high */
630 if (++dev->pkt_cnt > 30) {
631 dev->pkt_cnt = 0;
632 dev->pkt_err = 0;
633 } else {
634 if (state == rx_cleanup)
635 dev->pkt_err++;
636 if (dev->pkt_err > 20)
637 set_bit(EVENT_RX_KILL, &dev->flags);
638 }
639
640 state = defer_bh(dev, skb, &dev->rxq, state);
641
642 if (urb) {
643 if (netif_running (dev->net) &&
644 !test_bit (EVENT_RX_HALT, &dev->flags) &&
645 state != unlink_start) {
646 rx_submit (dev, urb, GFP_ATOMIC);
647 usb_mark_last_busy(dev->udev);
648 return;
649 }
650 usb_free_urb (urb);
651 }
652 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
653 }
654
655 /*-------------------------------------------------------------------------*/
656 void usbnet_pause_rx(struct usbnet *dev)
657 {
658 set_bit(EVENT_RX_PAUSED, &dev->flags);
659
660 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
661 }
662 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
663
664 void usbnet_resume_rx(struct usbnet *dev)
665 {
666 struct sk_buff *skb;
667 int num = 0;
668
669 clear_bit(EVENT_RX_PAUSED, &dev->flags);
670
671 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
672 usbnet_skb_return(dev, skb);
673 num++;
674 }
675
676 tasklet_schedule(&dev->bh);
677
678 netif_dbg(dev, rx_status, dev->net,
679 "paused rx queue disabled, %d skbs requeued\n", num);
680 }
681 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
682
683 void usbnet_purge_paused_rxq(struct usbnet *dev)
684 {
685 skb_queue_purge(&dev->rxq_pause);
686 }
687 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
688
689 /*-------------------------------------------------------------------------*/
690
691 // unlink pending rx/tx; completion handlers do all other cleanup
692
693 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
694 {
695 unsigned long flags;
696 struct sk_buff *skb;
697 int count = 0;
698
699 spin_lock_irqsave (&q->lock, flags);
700 while (!skb_queue_empty(q)) {
701 struct skb_data *entry;
702 struct urb *urb;
703 int retval;
704
705 skb_queue_walk(q, skb) {
706 entry = (struct skb_data *) skb->cb;
707 if (entry->state != unlink_start)
708 goto found;
709 }
710 break;
711 found:
712 entry->state = unlink_start;
713 urb = entry->urb;
714
715 /*
716 * Get reference count of the URB to avoid it to be
717 * freed during usb_unlink_urb, which may trigger
718 * use-after-free problem inside usb_unlink_urb since
719 * usb_unlink_urb is always racing with .complete
720 * handler(include defer_bh).
721 */
722 usb_get_urb(urb);
723 spin_unlock_irqrestore(&q->lock, flags);
724 // during some PM-driven resume scenarios,
725 // these (async) unlinks complete immediately
726 retval = usb_unlink_urb (urb);
727 if (retval != -EINPROGRESS && retval != 0)
728 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
729 else
730 count++;
731 usb_put_urb(urb);
732 spin_lock_irqsave(&q->lock, flags);
733 }
734 spin_unlock_irqrestore (&q->lock, flags);
735 return count;
736 }
737
738 // Flush all pending rx urbs
739 // minidrivers may need to do this when the MTU changes
740
741 void usbnet_unlink_rx_urbs(struct usbnet *dev)
742 {
743 if (netif_running(dev->net)) {
744 (void) unlink_urbs (dev, &dev->rxq);
745 tasklet_schedule(&dev->bh);
746 }
747 }
748 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
749
750 /*-------------------------------------------------------------------------*/
751
752 // precondition: never called in_interrupt
753 static void usbnet_terminate_urbs(struct usbnet *dev)
754 {
755 DECLARE_WAITQUEUE(wait, current);
756 int temp;
757
758 /* ensure there are no more active urbs */
759 add_wait_queue(&dev->wait, &wait);
760 set_current_state(TASK_UNINTERRUPTIBLE);
761 temp = unlink_urbs(dev, &dev->txq) +
762 unlink_urbs(dev, &dev->rxq);
763
764 /* maybe wait for deletions to finish. */
765 while (!skb_queue_empty(&dev->rxq)
766 && !skb_queue_empty(&dev->txq)
767 && !skb_queue_empty(&dev->done)) {
768 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
769 set_current_state(TASK_UNINTERRUPTIBLE);
770 netif_dbg(dev, ifdown, dev->net,
771 "waited for %d urb completions\n", temp);
772 }
773 set_current_state(TASK_RUNNING);
774 remove_wait_queue(&dev->wait, &wait);
775 }
776
777 int usbnet_stop (struct net_device *net)
778 {
779 struct usbnet *dev = netdev_priv(net);
780 struct driver_info *info = dev->driver_info;
781 int retval, pm;
782
783 clear_bit(EVENT_DEV_OPEN, &dev->flags);
784 netif_stop_queue (net);
785
786 netif_info(dev, ifdown, dev->net,
787 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
788 net->stats.rx_packets, net->stats.tx_packets,
789 net->stats.rx_errors, net->stats.tx_errors);
790
791 /* to not race resume */
792 pm = usb_autopm_get_interface(dev->intf);
793 /* allow minidriver to stop correctly (wireless devices to turn off
794 * radio etc) */
795 if (info->stop) {
796 retval = info->stop(dev);
797 if (retval < 0)
798 netif_info(dev, ifdown, dev->net,
799 "stop fail (%d) usbnet usb-%s-%s, %s\n",
800 retval,
801 dev->udev->bus->bus_name, dev->udev->devpath,
802 info->description);
803 }
804
805 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
806 usbnet_terminate_urbs(dev);
807
808 usbnet_status_stop(dev);
809
810 usbnet_purge_paused_rxq(dev);
811
812 /* deferred work (task, timer, softirq) must also stop.
813 * can't flush_scheduled_work() until we drop rtnl (later),
814 * else workers could deadlock; so make workers a NOP.
815 */
816 dev->flags = 0;
817 del_timer_sync (&dev->delay);
818 tasklet_kill (&dev->bh);
819 if (!pm)
820 usb_autopm_put_interface(dev->intf);
821
822 if (info->manage_power &&
823 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
824 info->manage_power(dev, 0);
825 else
826 usb_autopm_put_interface(dev->intf);
827
828 return 0;
829 }
830 EXPORT_SYMBOL_GPL(usbnet_stop);
831
832 /*-------------------------------------------------------------------------*/
833
834 // posts reads, and enables write queuing
835
836 // precondition: never called in_interrupt
837
838 int usbnet_open (struct net_device *net)
839 {
840 struct usbnet *dev = netdev_priv(net);
841 int retval;
842 struct driver_info *info = dev->driver_info;
843
844 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
845 netif_info(dev, ifup, dev->net,
846 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
847 retval,
848 dev->udev->bus->bus_name,
849 dev->udev->devpath,
850 info->description);
851 goto done_nopm;
852 }
853
854 // put into "known safe" state
855 if (info->reset && (retval = info->reset (dev)) < 0) {
856 netif_info(dev, ifup, dev->net,
857 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
858 retval,
859 dev->udev->bus->bus_name,
860 dev->udev->devpath,
861 info->description);
862 goto done;
863 }
864
865 /* hard_mtu or rx_urb_size may change in reset() */
866 usbnet_update_max_qlen(dev);
867
868 // insist peer be connected
869 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
870 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
871 goto done;
872 }
873
874 /* start any status interrupt transfer */
875 if (dev->interrupt) {
876 retval = usbnet_status_start(dev, GFP_KERNEL);
877 if (retval < 0) {
878 netif_err(dev, ifup, dev->net,
879 "intr submit %d\n", retval);
880 goto done;
881 }
882 }
883
884 set_bit(EVENT_DEV_OPEN, &dev->flags);
885 netif_start_queue (net);
886 netif_info(dev, ifup, dev->net,
887 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
888 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
889 dev->net->mtu,
890 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
891 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
892 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
893 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
894 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
895 "simple");
896
897 /* reset rx error state */
898 dev->pkt_cnt = 0;
899 dev->pkt_err = 0;
900 clear_bit(EVENT_RX_KILL, &dev->flags);
901
902 // delay posting reads until we're fully open
903 tasklet_schedule (&dev->bh);
904 if (info->manage_power) {
905 retval = info->manage_power(dev, 1);
906 if (retval < 0) {
907 retval = 0;
908 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
909 } else {
910 usb_autopm_put_interface(dev->intf);
911 }
912 }
913 return retval;
914 done:
915 usb_autopm_put_interface(dev->intf);
916 done_nopm:
917 return retval;
918 }
919 EXPORT_SYMBOL_GPL(usbnet_open);
920
921 /*-------------------------------------------------------------------------*/
922
923 /* ethtool methods; minidrivers may need to add some more, but
924 * they'll probably want to use this base set.
925 */
926
927 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
928 {
929 struct usbnet *dev = netdev_priv(net);
930
931 if (!dev->mii.mdio_read)
932 return -EOPNOTSUPP;
933
934 return mii_ethtool_gset(&dev->mii, cmd);
935 }
936 EXPORT_SYMBOL_GPL(usbnet_get_settings);
937
938 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
939 {
940 struct usbnet *dev = netdev_priv(net);
941 int retval;
942
943 if (!dev->mii.mdio_write)
944 return -EOPNOTSUPP;
945
946 retval = mii_ethtool_sset(&dev->mii, cmd);
947
948 /* link speed/duplex might have changed */
949 if (dev->driver_info->link_reset)
950 dev->driver_info->link_reset(dev);
951
952 /* hard_mtu or rx_urb_size may change in link_reset() */
953 usbnet_update_max_qlen(dev);
954
955 return retval;
956
957 }
958 EXPORT_SYMBOL_GPL(usbnet_set_settings);
959
960 u32 usbnet_get_link (struct net_device *net)
961 {
962 struct usbnet *dev = netdev_priv(net);
963
964 /* If a check_connect is defined, return its result */
965 if (dev->driver_info->check_connect)
966 return dev->driver_info->check_connect (dev) == 0;
967
968 /* if the device has mii operations, use those */
969 if (dev->mii.mdio_read)
970 return mii_link_ok(&dev->mii);
971
972 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
973 return ethtool_op_get_link(net);
974 }
975 EXPORT_SYMBOL_GPL(usbnet_get_link);
976
977 int usbnet_nway_reset(struct net_device *net)
978 {
979 struct usbnet *dev = netdev_priv(net);
980
981 if (!dev->mii.mdio_write)
982 return -EOPNOTSUPP;
983
984 return mii_nway_restart(&dev->mii);
985 }
986 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
987
988 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
989 {
990 struct usbnet *dev = netdev_priv(net);
991
992 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
993 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
994 strlcpy (info->fw_version, dev->driver_info->description,
995 sizeof info->fw_version);
996 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
997 }
998 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
999
1000 u32 usbnet_get_msglevel (struct net_device *net)
1001 {
1002 struct usbnet *dev = netdev_priv(net);
1003
1004 return dev->msg_enable;
1005 }
1006 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1007
1008 void usbnet_set_msglevel (struct net_device *net, u32 level)
1009 {
1010 struct usbnet *dev = netdev_priv(net);
1011
1012 dev->msg_enable = level;
1013 }
1014 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1015
1016 /* drivers may override default ethtool_ops in their bind() routine */
1017 static const struct ethtool_ops usbnet_ethtool_ops = {
1018 .get_settings = usbnet_get_settings,
1019 .set_settings = usbnet_set_settings,
1020 .get_link = usbnet_get_link,
1021 .nway_reset = usbnet_nway_reset,
1022 .get_drvinfo = usbnet_get_drvinfo,
1023 .get_msglevel = usbnet_get_msglevel,
1024 .set_msglevel = usbnet_set_msglevel,
1025 .get_ts_info = ethtool_op_get_ts_info,
1026 };
1027
1028 /*-------------------------------------------------------------------------*/
1029
1030 static void __handle_link_change(struct usbnet *dev)
1031 {
1032 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1033 return;
1034
1035 if (!netif_carrier_ok(dev->net)) {
1036 /* kill URBs for reading packets to save bus bandwidth */
1037 unlink_urbs(dev, &dev->rxq);
1038
1039 /*
1040 * tx_timeout will unlink URBs for sending packets and
1041 * tx queue is stopped by netcore after link becomes off
1042 */
1043 } else {
1044 /* submitting URBs for reading packets */
1045 tasklet_schedule(&dev->bh);
1046 }
1047
1048 /* hard_mtu or rx_urb_size may change during link change */
1049 usbnet_update_max_qlen(dev);
1050
1051 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1052 }
1053
1054 static void usbnet_set_rx_mode(struct net_device *net)
1055 {
1056 struct usbnet *dev = netdev_priv(net);
1057
1058 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1059 }
1060
1061 static void __handle_set_rx_mode(struct usbnet *dev)
1062 {
1063 if (dev->driver_info->set_rx_mode)
1064 (dev->driver_info->set_rx_mode)(dev);
1065
1066 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1067 }
1068
1069 /* work that cannot be done in interrupt context uses keventd.
1070 *
1071 * NOTE: with 2.5 we could do more of this using completion callbacks,
1072 * especially now that control transfers can be queued.
1073 */
1074 static void
1075 kevent (struct work_struct *work)
1076 {
1077 struct usbnet *dev =
1078 container_of(work, struct usbnet, kevent);
1079 int status;
1080
1081 /* usb_clear_halt() needs a thread context */
1082 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1083 unlink_urbs (dev, &dev->txq);
1084 status = usb_autopm_get_interface(dev->intf);
1085 if (status < 0)
1086 goto fail_pipe;
1087 status = usb_clear_halt (dev->udev, dev->out);
1088 usb_autopm_put_interface(dev->intf);
1089 if (status < 0 &&
1090 status != -EPIPE &&
1091 status != -ESHUTDOWN) {
1092 if (netif_msg_tx_err (dev))
1093 fail_pipe:
1094 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1095 status);
1096 } else {
1097 clear_bit (EVENT_TX_HALT, &dev->flags);
1098 if (status != -ESHUTDOWN)
1099 netif_wake_queue (dev->net);
1100 }
1101 }
1102 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1103 unlink_urbs (dev, &dev->rxq);
1104 status = usb_autopm_get_interface(dev->intf);
1105 if (status < 0)
1106 goto fail_halt;
1107 status = usb_clear_halt (dev->udev, dev->in);
1108 usb_autopm_put_interface(dev->intf);
1109 if (status < 0 &&
1110 status != -EPIPE &&
1111 status != -ESHUTDOWN) {
1112 if (netif_msg_rx_err (dev))
1113 fail_halt:
1114 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1115 status);
1116 } else {
1117 clear_bit (EVENT_RX_HALT, &dev->flags);
1118 tasklet_schedule (&dev->bh);
1119 }
1120 }
1121
1122 /* tasklet could resubmit itself forever if memory is tight */
1123 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1124 struct urb *urb = NULL;
1125 int resched = 1;
1126
1127 if (netif_running (dev->net))
1128 urb = usb_alloc_urb (0, GFP_KERNEL);
1129 else
1130 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1131 if (urb != NULL) {
1132 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1133 status = usb_autopm_get_interface(dev->intf);
1134 if (status < 0) {
1135 usb_free_urb(urb);
1136 goto fail_lowmem;
1137 }
1138 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1139 resched = 0;
1140 usb_autopm_put_interface(dev->intf);
1141 fail_lowmem:
1142 if (resched)
1143 tasklet_schedule (&dev->bh);
1144 }
1145 }
1146
1147 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1148 struct driver_info *info = dev->driver_info;
1149 int retval = 0;
1150
1151 clear_bit (EVENT_LINK_RESET, &dev->flags);
1152 status = usb_autopm_get_interface(dev->intf);
1153 if (status < 0)
1154 goto skip_reset;
1155 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1156 usb_autopm_put_interface(dev->intf);
1157 skip_reset:
1158 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1159 retval,
1160 dev->udev->bus->bus_name,
1161 dev->udev->devpath,
1162 info->description);
1163 } else {
1164 usb_autopm_put_interface(dev->intf);
1165 }
1166
1167 /* handle link change from link resetting */
1168 __handle_link_change(dev);
1169 }
1170
1171 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1172 __handle_link_change(dev);
1173
1174 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1175 __handle_set_rx_mode(dev);
1176
1177
1178 if (dev->flags)
1179 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1180 }
1181
1182 /*-------------------------------------------------------------------------*/
1183
1184 static void tx_complete (struct urb *urb)
1185 {
1186 struct sk_buff *skb = (struct sk_buff *) urb->context;
1187 struct skb_data *entry = (struct skb_data *) skb->cb;
1188 struct usbnet *dev = entry->dev;
1189
1190 if (urb->status == 0) {
1191 dev->net->stats.tx_packets += entry->packets;
1192 dev->net->stats.tx_bytes += entry->length;
1193 } else {
1194 dev->net->stats.tx_errors++;
1195
1196 switch (urb->status) {
1197 case -EPIPE:
1198 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1199 break;
1200
1201 /* software-driven interface shutdown */
1202 case -ECONNRESET: // async unlink
1203 case -ESHUTDOWN: // hardware gone
1204 break;
1205
1206 /* like rx, tx gets controller i/o faults during hub_wq
1207 * delays and so it uses the same throttling mechanism.
1208 */
1209 case -EPROTO:
1210 case -ETIME:
1211 case -EILSEQ:
1212 usb_mark_last_busy(dev->udev);
1213 if (!timer_pending (&dev->delay)) {
1214 mod_timer (&dev->delay,
1215 jiffies + THROTTLE_JIFFIES);
1216 netif_dbg(dev, link, dev->net,
1217 "tx throttle %d\n", urb->status);
1218 }
1219 netif_stop_queue (dev->net);
1220 break;
1221 default:
1222 netif_dbg(dev, tx_err, dev->net,
1223 "tx err %d\n", entry->urb->status);
1224 break;
1225 }
1226 }
1227
1228 usb_autopm_put_interface_async(dev->intf);
1229 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1230 }
1231
1232 /*-------------------------------------------------------------------------*/
1233
1234 void usbnet_tx_timeout (struct net_device *net)
1235 {
1236 struct usbnet *dev = netdev_priv(net);
1237
1238 unlink_urbs (dev, &dev->txq);
1239 tasklet_schedule (&dev->bh);
1240 /* this needs to be handled individually because the generic layer
1241 * doesn't know what is sufficient and could not restore private
1242 * information if a remedy of an unconditional reset were used.
1243 */
1244 if (dev->driver_info->recover)
1245 (dev->driver_info->recover)(dev);
1246 }
1247 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1248
1249 /*-------------------------------------------------------------------------*/
1250
1251 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1252 {
1253 unsigned num_sgs, total_len = 0;
1254 int i, s = 0;
1255
1256 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1257 if (num_sgs == 1)
1258 return 0;
1259
1260 /* reserve one for zero packet */
1261 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1262 GFP_ATOMIC);
1263 if (!urb->sg)
1264 return -ENOMEM;
1265
1266 urb->num_sgs = num_sgs;
1267 sg_init_table(urb->sg, urb->num_sgs + 1);
1268
1269 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1270 total_len += skb_headlen(skb);
1271
1272 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1273 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1274
1275 total_len += skb_frag_size(f);
1276 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1277 f->page_offset);
1278 }
1279 urb->transfer_buffer_length = total_len;
1280
1281 return 1;
1282 }
1283
1284 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1285 struct net_device *net)
1286 {
1287 struct usbnet *dev = netdev_priv(net);
1288 int length;
1289 struct urb *urb = NULL;
1290 struct skb_data *entry;
1291 struct driver_info *info = dev->driver_info;
1292 unsigned long flags;
1293 int retval;
1294
1295 if (skb)
1296 skb_tx_timestamp(skb);
1297
1298 // some devices want funky USB-level framing, for
1299 // win32 driver (usually) and/or hardware quirks
1300 if (info->tx_fixup) {
1301 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1302 if (!skb) {
1303 /* packet collected; minidriver waiting for more */
1304 if (info->flags & FLAG_MULTI_PACKET)
1305 goto not_drop;
1306 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1307 goto drop;
1308 }
1309 }
1310
1311 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1312 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1313 goto drop;
1314 }
1315
1316 entry = (struct skb_data *) skb->cb;
1317 entry->urb = urb;
1318 entry->dev = dev;
1319
1320 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1321 skb->data, skb->len, tx_complete, skb);
1322 if (dev->can_dma_sg) {
1323 if (build_dma_sg(skb, urb) < 0)
1324 goto drop;
1325 }
1326 length = urb->transfer_buffer_length;
1327
1328 /* don't assume the hardware handles USB_ZERO_PACKET
1329 * NOTE: strictly conforming cdc-ether devices should expect
1330 * the ZLP here, but ignore the one-byte packet.
1331 * NOTE2: CDC NCM specification is different from CDC ECM when
1332 * handling ZLP/short packets, so cdc_ncm driver will make short
1333 * packet itself if needed.
1334 */
1335 if (length % dev->maxpacket == 0) {
1336 if (!(info->flags & FLAG_SEND_ZLP)) {
1337 if (!(info->flags & FLAG_MULTI_PACKET)) {
1338 length++;
1339 if (skb_tailroom(skb) && !urb->num_sgs) {
1340 skb->data[skb->len] = 0;
1341 __skb_put(skb, 1);
1342 } else if (urb->num_sgs)
1343 sg_set_buf(&urb->sg[urb->num_sgs++],
1344 dev->padding_pkt, 1);
1345 }
1346 } else
1347 urb->transfer_flags |= URB_ZERO_PACKET;
1348 }
1349 urb->transfer_buffer_length = length;
1350
1351 if (info->flags & FLAG_MULTI_PACKET) {
1352 /* Driver has set number of packets and a length delta.
1353 * Calculate the complete length and ensure that it's
1354 * positive.
1355 */
1356 entry->length += length;
1357 if (WARN_ON_ONCE(entry->length <= 0))
1358 entry->length = length;
1359 } else {
1360 usbnet_set_skb_tx_stats(skb, 1, length);
1361 }
1362
1363 spin_lock_irqsave(&dev->txq.lock, flags);
1364 retval = usb_autopm_get_interface_async(dev->intf);
1365 if (retval < 0) {
1366 spin_unlock_irqrestore(&dev->txq.lock, flags);
1367 goto drop;
1368 }
1369
1370 #ifdef CONFIG_PM
1371 /* if this triggers the device is still a sleep */
1372 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1373 /* transmission will be done in resume */
1374 usb_anchor_urb(urb, &dev->deferred);
1375 /* no use to process more packets */
1376 netif_stop_queue(net);
1377 usb_put_urb(urb);
1378 spin_unlock_irqrestore(&dev->txq.lock, flags);
1379 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1380 goto deferred;
1381 }
1382 #endif
1383
1384 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1385 case -EPIPE:
1386 netif_stop_queue (net);
1387 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1388 usb_autopm_put_interface_async(dev->intf);
1389 break;
1390 default:
1391 usb_autopm_put_interface_async(dev->intf);
1392 netif_dbg(dev, tx_err, dev->net,
1393 "tx: submit urb err %d\n", retval);
1394 break;
1395 case 0:
1396 net->trans_start = jiffies;
1397 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1398 if (dev->txq.qlen >= TX_QLEN (dev))
1399 netif_stop_queue (net);
1400 }
1401 spin_unlock_irqrestore (&dev->txq.lock, flags);
1402
1403 if (retval) {
1404 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1405 drop:
1406 dev->net->stats.tx_dropped++;
1407 not_drop:
1408 if (skb)
1409 dev_kfree_skb_any (skb);
1410 if (urb) {
1411 kfree(urb->sg);
1412 usb_free_urb(urb);
1413 }
1414 } else
1415 netif_dbg(dev, tx_queued, dev->net,
1416 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1417 #ifdef CONFIG_PM
1418 deferred:
1419 #endif
1420 return NETDEV_TX_OK;
1421 }
1422 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1423
1424 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1425 {
1426 struct urb *urb;
1427 int i;
1428 int ret = 0;
1429
1430 /* don't refill the queue all at once */
1431 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1432 urb = usb_alloc_urb(0, flags);
1433 if (urb != NULL) {
1434 ret = rx_submit(dev, urb, flags);
1435 if (ret)
1436 goto err;
1437 } else {
1438 ret = -ENOMEM;
1439 goto err;
1440 }
1441 }
1442 err:
1443 return ret;
1444 }
1445
1446 /*-------------------------------------------------------------------------*/
1447
1448 // tasklet (work deferred from completions, in_irq) or timer
1449
1450 static void usbnet_bh (unsigned long param)
1451 {
1452 struct usbnet *dev = (struct usbnet *) param;
1453 struct sk_buff *skb;
1454 struct skb_data *entry;
1455
1456 while ((skb = skb_dequeue (&dev->done))) {
1457 entry = (struct skb_data *) skb->cb;
1458 switch (entry->state) {
1459 case rx_done:
1460 entry->state = rx_cleanup;
1461 rx_process (dev, skb);
1462 continue;
1463 case tx_done:
1464 kfree(entry->urb->sg);
1465 case rx_cleanup:
1466 usb_free_urb (entry->urb);
1467 dev_kfree_skb (skb);
1468 continue;
1469 default:
1470 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1471 }
1472 }
1473
1474 /* restart RX again after disabling due to high error rate */
1475 clear_bit(EVENT_RX_KILL, &dev->flags);
1476
1477 /* waiting for all pending urbs to complete?
1478 * only then can we forgo submitting anew
1479 */
1480 if (waitqueue_active(&dev->wait)) {
1481 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1482 wake_up_all(&dev->wait);
1483
1484 // or are we maybe short a few urbs?
1485 } else if (netif_running (dev->net) &&
1486 netif_device_present (dev->net) &&
1487 netif_carrier_ok(dev->net) &&
1488 !timer_pending (&dev->delay) &&
1489 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1490 int temp = dev->rxq.qlen;
1491
1492 if (temp < RX_QLEN(dev)) {
1493 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1494 return;
1495 if (temp != dev->rxq.qlen)
1496 netif_dbg(dev, link, dev->net,
1497 "rxqlen %d --> %d\n",
1498 temp, dev->rxq.qlen);
1499 if (dev->rxq.qlen < RX_QLEN(dev))
1500 tasklet_schedule (&dev->bh);
1501 }
1502 if (dev->txq.qlen < TX_QLEN (dev))
1503 netif_wake_queue (dev->net);
1504 }
1505 }
1506
1507
1508 /*-------------------------------------------------------------------------
1509 *
1510 * USB Device Driver support
1511 *
1512 *-------------------------------------------------------------------------*/
1513
1514 // precondition: never called in_interrupt
1515
1516 void usbnet_disconnect (struct usb_interface *intf)
1517 {
1518 struct usbnet *dev;
1519 struct usb_device *xdev;
1520 struct net_device *net;
1521
1522 dev = usb_get_intfdata(intf);
1523 usb_set_intfdata(intf, NULL);
1524 if (!dev)
1525 return;
1526
1527 xdev = interface_to_usbdev (intf);
1528
1529 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1530 intf->dev.driver->name,
1531 xdev->bus->bus_name, xdev->devpath,
1532 dev->driver_info->description);
1533
1534 net = dev->net;
1535 unregister_netdev (net);
1536
1537 cancel_work_sync(&dev->kevent);
1538
1539 usb_scuttle_anchored_urbs(&dev->deferred);
1540
1541 if (dev->driver_info->unbind)
1542 dev->driver_info->unbind (dev, intf);
1543
1544 usb_kill_urb(dev->interrupt);
1545 usb_free_urb(dev->interrupt);
1546 kfree(dev->padding_pkt);
1547
1548 free_netdev(net);
1549 }
1550 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1551
1552 static const struct net_device_ops usbnet_netdev_ops = {
1553 .ndo_open = usbnet_open,
1554 .ndo_stop = usbnet_stop,
1555 .ndo_start_xmit = usbnet_start_xmit,
1556 .ndo_tx_timeout = usbnet_tx_timeout,
1557 .ndo_set_rx_mode = usbnet_set_rx_mode,
1558 .ndo_change_mtu = usbnet_change_mtu,
1559 .ndo_set_mac_address = eth_mac_addr,
1560 .ndo_validate_addr = eth_validate_addr,
1561 };
1562
1563 /*-------------------------------------------------------------------------*/
1564
1565 // precondition: never called in_interrupt
1566
1567 static struct device_type wlan_type = {
1568 .name = "wlan",
1569 };
1570
1571 static struct device_type wwan_type = {
1572 .name = "wwan",
1573 };
1574
1575 int
1576 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1577 {
1578 struct usbnet *dev;
1579 struct net_device *net;
1580 struct usb_host_interface *interface;
1581 struct driver_info *info;
1582 struct usb_device *xdev;
1583 int status;
1584 const char *name;
1585 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1586
1587 /* usbnet already took usb runtime pm, so have to enable the feature
1588 * for usb interface, otherwise usb_autopm_get_interface may return
1589 * failure if RUNTIME_PM is enabled.
1590 */
1591 if (!driver->supports_autosuspend) {
1592 driver->supports_autosuspend = 1;
1593 pm_runtime_enable(&udev->dev);
1594 }
1595
1596 name = udev->dev.driver->name;
1597 info = (struct driver_info *) prod->driver_info;
1598 if (!info) {
1599 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1600 return -ENODEV;
1601 }
1602 xdev = interface_to_usbdev (udev);
1603 interface = udev->cur_altsetting;
1604
1605 status = -ENOMEM;
1606
1607 // set up our own records
1608 net = alloc_etherdev(sizeof(*dev));
1609 if (!net)
1610 goto out;
1611
1612 /* netdev_printk() needs this so do it as early as possible */
1613 SET_NETDEV_DEV(net, &udev->dev);
1614
1615 dev = netdev_priv(net);
1616 dev->udev = xdev;
1617 dev->intf = udev;
1618 dev->driver_info = info;
1619 dev->driver_name = name;
1620 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1621 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1622 init_waitqueue_head(&dev->wait);
1623 skb_queue_head_init (&dev->rxq);
1624 skb_queue_head_init (&dev->txq);
1625 skb_queue_head_init (&dev->done);
1626 skb_queue_head_init(&dev->rxq_pause);
1627 dev->bh.func = usbnet_bh;
1628 dev->bh.data = (unsigned long) dev;
1629 INIT_WORK (&dev->kevent, kevent);
1630 init_usb_anchor(&dev->deferred);
1631 dev->delay.function = usbnet_bh;
1632 dev->delay.data = (unsigned long) dev;
1633 init_timer (&dev->delay);
1634 mutex_init (&dev->phy_mutex);
1635 mutex_init(&dev->interrupt_mutex);
1636 dev->interrupt_count = 0;
1637
1638 dev->net = net;
1639 strcpy (net->name, "usb%d");
1640 memcpy (net->dev_addr, node_id, sizeof node_id);
1641
1642 /* rx and tx sides can use different message sizes;
1643 * bind() should set rx_urb_size in that case.
1644 */
1645 dev->hard_mtu = net->mtu + net->hard_header_len;
1646 #if 0
1647 // dma_supported() is deeply broken on almost all architectures
1648 // possible with some EHCI controllers
1649 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1650 net->features |= NETIF_F_HIGHDMA;
1651 #endif
1652
1653 net->netdev_ops = &usbnet_netdev_ops;
1654 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1655 net->ethtool_ops = &usbnet_ethtool_ops;
1656
1657 // allow device-specific bind/init procedures
1658 // NOTE net->name still not usable ...
1659 if (info->bind) {
1660 status = info->bind (dev, udev);
1661 if (status < 0)
1662 goto out1;
1663
1664 // heuristic: "usb%d" for links we know are two-host,
1665 // else "eth%d" when there's reasonable doubt. userspace
1666 // can rename the link if it knows better.
1667 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1668 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1669 (net->dev_addr [0] & 0x02) == 0))
1670 strcpy (net->name, "eth%d");
1671 /* WLAN devices should always be named "wlan%d" */
1672 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1673 strcpy(net->name, "wlan%d");
1674 /* WWAN devices should always be named "wwan%d" */
1675 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1676 strcpy(net->name, "wwan%d");
1677
1678 /* devices that cannot do ARP */
1679 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1680 net->flags |= IFF_NOARP;
1681
1682 /* maybe the remote can't receive an Ethernet MTU */
1683 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1684 net->mtu = dev->hard_mtu - net->hard_header_len;
1685 } else if (!info->in || !info->out)
1686 status = usbnet_get_endpoints (dev, udev);
1687 else {
1688 dev->in = usb_rcvbulkpipe (xdev, info->in);
1689 dev->out = usb_sndbulkpipe (xdev, info->out);
1690 if (!(info->flags & FLAG_NO_SETINT))
1691 status = usb_set_interface (xdev,
1692 interface->desc.bInterfaceNumber,
1693 interface->desc.bAlternateSetting);
1694 else
1695 status = 0;
1696
1697 }
1698 if (status >= 0 && dev->status)
1699 status = init_status (dev, udev);
1700 if (status < 0)
1701 goto out3;
1702
1703 if (!dev->rx_urb_size)
1704 dev->rx_urb_size = dev->hard_mtu;
1705 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1706
1707 /* let userspace know we have a random address */
1708 if (ether_addr_equal(net->dev_addr, node_id))
1709 net->addr_assign_type = NET_ADDR_RANDOM;
1710
1711 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1712 SET_NETDEV_DEVTYPE(net, &wlan_type);
1713 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1714 SET_NETDEV_DEVTYPE(net, &wwan_type);
1715
1716 /* initialize max rx_qlen and tx_qlen */
1717 usbnet_update_max_qlen(dev);
1718
1719 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1720 !(info->flags & FLAG_MULTI_PACKET)) {
1721 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1722 if (!dev->padding_pkt) {
1723 status = -ENOMEM;
1724 goto out4;
1725 }
1726 }
1727
1728 status = register_netdev (net);
1729 if (status)
1730 goto out5;
1731 netif_info(dev, probe, dev->net,
1732 "register '%s' at usb-%s-%s, %s, %pM\n",
1733 udev->dev.driver->name,
1734 xdev->bus->bus_name, xdev->devpath,
1735 dev->driver_info->description,
1736 net->dev_addr);
1737
1738 // ok, it's ready to go.
1739 usb_set_intfdata (udev, dev);
1740
1741 netif_device_attach (net);
1742
1743 if (dev->driver_info->flags & FLAG_LINK_INTR)
1744 usbnet_link_change(dev, 0, 0);
1745
1746 return 0;
1747
1748 out5:
1749 kfree(dev->padding_pkt);
1750 out4:
1751 usb_free_urb(dev->interrupt);
1752 out3:
1753 if (info->unbind)
1754 info->unbind (dev, udev);
1755 out1:
1756 free_netdev(net);
1757 out:
1758 return status;
1759 }
1760 EXPORT_SYMBOL_GPL(usbnet_probe);
1761
1762 /*-------------------------------------------------------------------------*/
1763
1764 /*
1765 * suspend the whole driver as soon as the first interface is suspended
1766 * resume only when the last interface is resumed
1767 */
1768
1769 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1770 {
1771 struct usbnet *dev = usb_get_intfdata(intf);
1772
1773 if (!dev->suspend_count++) {
1774 spin_lock_irq(&dev->txq.lock);
1775 /* don't autosuspend while transmitting */
1776 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1777 dev->suspend_count--;
1778 spin_unlock_irq(&dev->txq.lock);
1779 return -EBUSY;
1780 } else {
1781 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1782 spin_unlock_irq(&dev->txq.lock);
1783 }
1784 /*
1785 * accelerate emptying of the rx and queues, to avoid
1786 * having everything error out.
1787 */
1788 netif_device_detach (dev->net);
1789 usbnet_terminate_urbs(dev);
1790 __usbnet_status_stop_force(dev);
1791
1792 /*
1793 * reattach so runtime management can use and
1794 * wake the device
1795 */
1796 netif_device_attach (dev->net);
1797 }
1798 return 0;
1799 }
1800 EXPORT_SYMBOL_GPL(usbnet_suspend);
1801
1802 int usbnet_resume (struct usb_interface *intf)
1803 {
1804 struct usbnet *dev = usb_get_intfdata(intf);
1805 struct sk_buff *skb;
1806 struct urb *res;
1807 int retval;
1808
1809 if (!--dev->suspend_count) {
1810 /* resume interrupt URB if it was previously submitted */
1811 __usbnet_status_start_force(dev, GFP_NOIO);
1812
1813 spin_lock_irq(&dev->txq.lock);
1814 while ((res = usb_get_from_anchor(&dev->deferred))) {
1815
1816 skb = (struct sk_buff *)res->context;
1817 retval = usb_submit_urb(res, GFP_ATOMIC);
1818 if (retval < 0) {
1819 dev_kfree_skb_any(skb);
1820 kfree(res->sg);
1821 usb_free_urb(res);
1822 usb_autopm_put_interface_async(dev->intf);
1823 } else {
1824 dev->net->trans_start = jiffies;
1825 __skb_queue_tail(&dev->txq, skb);
1826 }
1827 }
1828
1829 smp_mb();
1830 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1831 spin_unlock_irq(&dev->txq.lock);
1832
1833 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1834 /* handle remote wakeup ASAP
1835 * we cannot race against stop
1836 */
1837 if (netif_device_present(dev->net) &&
1838 !timer_pending(&dev->delay) &&
1839 !test_bit(EVENT_RX_HALT, &dev->flags))
1840 rx_alloc_submit(dev, GFP_NOIO);
1841
1842 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1843 netif_tx_wake_all_queues(dev->net);
1844 tasklet_schedule (&dev->bh);
1845 }
1846 }
1847
1848 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1849 usb_autopm_get_interface_no_resume(intf);
1850
1851 return 0;
1852 }
1853 EXPORT_SYMBOL_GPL(usbnet_resume);
1854
1855 /*
1856 * Either a subdriver implements manage_power, then it is assumed to always
1857 * be ready to be suspended or it reports the readiness to be suspended
1858 * explicitly
1859 */
1860 void usbnet_device_suggests_idle(struct usbnet *dev)
1861 {
1862 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1863 dev->intf->needs_remote_wakeup = 1;
1864 usb_autopm_put_interface_async(dev->intf);
1865 }
1866 }
1867 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1868
1869 /*
1870 * For devices that can do without special commands
1871 */
1872 int usbnet_manage_power(struct usbnet *dev, int on)
1873 {
1874 dev->intf->needs_remote_wakeup = on;
1875 return 0;
1876 }
1877 EXPORT_SYMBOL(usbnet_manage_power);
1878
1879 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1880 {
1881 /* update link after link is reseted */
1882 if (link && !need_reset)
1883 netif_carrier_on(dev->net);
1884 else
1885 netif_carrier_off(dev->net);
1886
1887 if (need_reset && link)
1888 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1889 else
1890 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1891 }
1892 EXPORT_SYMBOL(usbnet_link_change);
1893
1894 /*-------------------------------------------------------------------------*/
1895 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1896 u16 value, u16 index, void *data, u16 size)
1897 {
1898 void *buf = NULL;
1899 int err = -ENOMEM;
1900
1901 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1902 " value=0x%04x index=0x%04x size=%d\n",
1903 cmd, reqtype, value, index, size);
1904
1905 if (data) {
1906 buf = kmalloc(size, GFP_KERNEL);
1907 if (!buf)
1908 goto out;
1909 }
1910
1911 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1912 cmd, reqtype, value, index, buf, size,
1913 USB_CTRL_GET_TIMEOUT);
1914 if (err > 0 && err <= size)
1915 memcpy(data, buf, err);
1916 kfree(buf);
1917 out:
1918 return err;
1919 }
1920
1921 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1922 u16 value, u16 index, const void *data,
1923 u16 size)
1924 {
1925 void *buf = NULL;
1926 int err = -ENOMEM;
1927
1928 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1929 " value=0x%04x index=0x%04x size=%d\n",
1930 cmd, reqtype, value, index, size);
1931
1932 if (data) {
1933 buf = kmemdup(data, size, GFP_KERNEL);
1934 if (!buf)
1935 goto out;
1936 }
1937
1938 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1939 cmd, reqtype, value, index, buf, size,
1940 USB_CTRL_SET_TIMEOUT);
1941 kfree(buf);
1942
1943 out:
1944 return err;
1945 }
1946
1947 /*
1948 * The function can't be called inside suspend/resume callback,
1949 * otherwise deadlock will be caused.
1950 */
1951 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1952 u16 value, u16 index, void *data, u16 size)
1953 {
1954 int ret;
1955
1956 if (usb_autopm_get_interface(dev->intf) < 0)
1957 return -ENODEV;
1958 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1959 data, size);
1960 usb_autopm_put_interface(dev->intf);
1961 return ret;
1962 }
1963 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1964
1965 /*
1966 * The function can't be called inside suspend/resume callback,
1967 * otherwise deadlock will be caused.
1968 */
1969 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1970 u16 value, u16 index, const void *data, u16 size)
1971 {
1972 int ret;
1973
1974 if (usb_autopm_get_interface(dev->intf) < 0)
1975 return -ENODEV;
1976 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1977 data, size);
1978 usb_autopm_put_interface(dev->intf);
1979 return ret;
1980 }
1981 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1982
1983 /*
1984 * The function can be called inside suspend/resume callback safely
1985 * and should only be called by suspend/resume callback generally.
1986 */
1987 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1988 u16 value, u16 index, void *data, u16 size)
1989 {
1990 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1991 data, size);
1992 }
1993 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1994
1995 /*
1996 * The function can be called inside suspend/resume callback safely
1997 * and should only be called by suspend/resume callback generally.
1998 */
1999 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2000 u16 value, u16 index, const void *data,
2001 u16 size)
2002 {
2003 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2004 data, size);
2005 }
2006 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2007
2008 static void usbnet_async_cmd_cb(struct urb *urb)
2009 {
2010 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2011 int status = urb->status;
2012
2013 if (status < 0)
2014 dev_dbg(&urb->dev->dev, "%s failed with %d",
2015 __func__, status);
2016
2017 kfree(req);
2018 usb_free_urb(urb);
2019 }
2020
2021 /*
2022 * The caller must make sure that device can't be put into suspend
2023 * state until the control URB completes.
2024 */
2025 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2026 u16 value, u16 index, const void *data, u16 size)
2027 {
2028 struct usb_ctrlrequest *req = NULL;
2029 struct urb *urb;
2030 int err = -ENOMEM;
2031 void *buf = NULL;
2032
2033 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2034 " value=0x%04x index=0x%04x size=%d\n",
2035 cmd, reqtype, value, index, size);
2036
2037 urb = usb_alloc_urb(0, GFP_ATOMIC);
2038 if (!urb) {
2039 netdev_err(dev->net, "Error allocating URB in"
2040 " %s!\n", __func__);
2041 goto fail;
2042 }
2043
2044 if (data) {
2045 buf = kmemdup(data, size, GFP_ATOMIC);
2046 if (!buf) {
2047 netdev_err(dev->net, "Error allocating buffer"
2048 " in %s!\n", __func__);
2049 goto fail_free;
2050 }
2051 }
2052
2053 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2054 if (!req)
2055 goto fail_free_buf;
2056
2057 req->bRequestType = reqtype;
2058 req->bRequest = cmd;
2059 req->wValue = cpu_to_le16(value);
2060 req->wIndex = cpu_to_le16(index);
2061 req->wLength = cpu_to_le16(size);
2062
2063 usb_fill_control_urb(urb, dev->udev,
2064 usb_sndctrlpipe(dev->udev, 0),
2065 (void *)req, buf, size,
2066 usbnet_async_cmd_cb, req);
2067 urb->transfer_flags |= URB_FREE_BUFFER;
2068
2069 err = usb_submit_urb(urb, GFP_ATOMIC);
2070 if (err < 0) {
2071 netdev_err(dev->net, "Error submitting the control"
2072 " message: status=%d\n", err);
2073 goto fail_free;
2074 }
2075 return 0;
2076
2077 fail_free_buf:
2078 kfree(buf);
2079 fail_free:
2080 kfree(req);
2081 usb_free_urb(urb);
2082 fail:
2083 return err;
2084
2085 }
2086 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2087 /*-------------------------------------------------------------------------*/
2088
2089 static int __init usbnet_init(void)
2090 {
2091 /* Compiler should optimize this out. */
2092 BUILD_BUG_ON(
2093 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2094
2095 eth_random_addr(node_id);
2096 return 0;
2097 }
2098 module_init(usbnet_init);
2099
2100 static void __exit usbnet_exit(void)
2101 {
2102 }
2103 module_exit(usbnet_exit);
2104
2105 MODULE_AUTHOR("David Brownell");
2106 MODULE_DESCRIPTION("USB network driver framework");
2107 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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