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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / net / usb / usbnet.c
blob4671da755e7b87f60758259021bcc5ab7f7c6cd1
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 khubd might disconnect()
73 // us (it polls at HZ/4 usually) before we report too many false errors.
74 #define THROTTLE_JIFFIES (HZ/8)
75
76 // between wakeups
77 #define UNLINK_TIMEOUT_MS 3
78
79 /*-------------------------------------------------------------------------*/
80
81 // randomly generated ethernet address
82 static u8 node_id [ETH_ALEN];
83
84 static const char driver_name [] = "usbnet";
85
86 /* use ethtool to change the level for any given device */
87 static int msg_level = -1;
88 module_param (msg_level, int, 0);
89 MODULE_PARM_DESC (msg_level, "Override default message level");
90
91 /*-------------------------------------------------------------------------*/
92
93 /* handles CDC Ethernet and many other network "bulk data" interfaces */
94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
95 {
96 int tmp;
97 struct usb_host_interface *alt = NULL;
98 struct usb_host_endpoint *in = NULL, *out = NULL;
99 struct usb_host_endpoint *status = NULL;
100
101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
102 unsigned ep;
103
104 in = out = status = NULL;
105 alt = intf->altsetting + tmp;
106
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
109 * ignore other endpoints and altsettings.
110 */
111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
112 struct usb_host_endpoint *e;
113 int intr = 0;
114
115 e = alt->endpoint + ep;
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
118 if (!usb_endpoint_dir_in(&e->desc))
119 continue;
120 intr = 1;
121 /* FALLTHROUGH */
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
127 if (usb_endpoint_dir_in(&e->desc)) {
128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
143 if (alt->desc.bAlternateSetting != 0 ||
144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
146 alt->desc.bAlternateSetting);
147 if (tmp < 0)
148 return tmp;
149 }
150
151 dev->in = usb_rcvbulkpipe (dev->udev,
152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
153 dev->out = usb_sndbulkpipe (dev->udev,
154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->status = status;
156 return 0;
157 }
158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159
160 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
161 {
162 int tmp, i;
163 unsigned char buf [13];
164
165 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
166 if (tmp != 12) {
167 dev_dbg(&dev->udev->dev,
168 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
169 if (tmp >= 0)
170 tmp = -EINVAL;
171 return tmp;
172 }
173 for (i = tmp = 0; i < 6; i++, tmp += 2)
174 dev->net->dev_addr [i] =
175 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
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 if (skb->len) {
546 /* all data was already cloned from skb inside the driver */
547 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
548 dev_kfree_skb_any(skb);
549 else
550 usbnet_skb_return(dev, skb);
551 return;
552 }
553
554 netif_dbg(dev, rx_err, dev->net, "drop\n");
555 dev->net->stats.rx_errors++;
556 done:
557 skb_queue_tail(&dev->done, skb);
558 }
559
560 /*-------------------------------------------------------------------------*/
561
562 static void rx_complete (struct urb *urb)
563 {
564 struct sk_buff *skb = (struct sk_buff *) urb->context;
565 struct skb_data *entry = (struct skb_data *) skb->cb;
566 struct usbnet *dev = entry->dev;
567 int urb_status = urb->status;
568 enum skb_state state;
569
570 skb_put (skb, urb->actual_length);
571 state = rx_done;
572 entry->urb = NULL;
573
574 switch (urb_status) {
575 /* success */
576 case 0:
577 if (skb->len < dev->net->hard_header_len) {
578 state = rx_cleanup;
579 dev->net->stats.rx_errors++;
580 dev->net->stats.rx_length_errors++;
581 netif_dbg(dev, rx_err, dev->net,
582 "rx length %d\n", skb->len);
583 }
584 break;
585
586 /* stalls need manual reset. this is rare ... except that
587 * when going through USB 2.0 TTs, unplug appears this way.
588 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
589 * storm, recovering as needed.
590 */
591 case -EPIPE:
592 dev->net->stats.rx_errors++;
593 usbnet_defer_kevent (dev, EVENT_RX_HALT);
594 // FALLTHROUGH
595
596 /* software-driven interface shutdown */
597 case -ECONNRESET: /* async unlink */
598 case -ESHUTDOWN: /* hardware gone */
599 netif_dbg(dev, ifdown, dev->net,
600 "rx shutdown, code %d\n", urb_status);
601 goto block;
602
603 /* we get controller i/o faults during khubd disconnect() delays.
604 * throttle down resubmits, to avoid log floods; just temporarily,
605 * so we still recover when the fault isn't a khubd delay.
606 */
607 case -EPROTO:
608 case -ETIME:
609 case -EILSEQ:
610 dev->net->stats.rx_errors++;
611 if (!timer_pending (&dev->delay)) {
612 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
613 netif_dbg(dev, link, dev->net,
614 "rx throttle %d\n", urb_status);
615 }
616 block:
617 state = rx_cleanup;
618 entry->urb = urb;
619 urb = NULL;
620 break;
621
622 /* data overrun ... flush fifo? */
623 case -EOVERFLOW:
624 dev->net->stats.rx_over_errors++;
625 // FALLTHROUGH
626
627 default:
628 state = rx_cleanup;
629 dev->net->stats.rx_errors++;
630 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
631 break;
632 }
633
634 /* stop rx if packet error rate is high */
635 if (++dev->pkt_cnt > 30) {
636 dev->pkt_cnt = 0;
637 dev->pkt_err = 0;
638 } else {
639 if (state == rx_cleanup)
640 dev->pkt_err++;
641 if (dev->pkt_err > 20)
642 set_bit(EVENT_RX_KILL, &dev->flags);
643 }
644
645 state = defer_bh(dev, skb, &dev->rxq, state);
646
647 if (urb) {
648 if (netif_running (dev->net) &&
649 !test_bit (EVENT_RX_HALT, &dev->flags) &&
650 state != unlink_start) {
651 rx_submit (dev, urb, GFP_ATOMIC);
652 usb_mark_last_busy(dev->udev);
653 return;
654 }
655 usb_free_urb (urb);
656 }
657 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
658 }
659
660 /*-------------------------------------------------------------------------*/
661 void usbnet_pause_rx(struct usbnet *dev)
662 {
663 set_bit(EVENT_RX_PAUSED, &dev->flags);
664
665 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
666 }
667 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
668
669 void usbnet_resume_rx(struct usbnet *dev)
670 {
671 struct sk_buff *skb;
672 int num = 0;
673
674 clear_bit(EVENT_RX_PAUSED, &dev->flags);
675
676 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
677 usbnet_skb_return(dev, skb);
678 num++;
679 }
680
681 tasklet_schedule(&dev->bh);
682
683 netif_dbg(dev, rx_status, dev->net,
684 "paused rx queue disabled, %d skbs requeued\n", num);
685 }
686 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
687
688 void usbnet_purge_paused_rxq(struct usbnet *dev)
689 {
690 skb_queue_purge(&dev->rxq_pause);
691 }
692 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
693
694 /*-------------------------------------------------------------------------*/
695
696 // unlink pending rx/tx; completion handlers do all other cleanup
697
698 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
699 {
700 unsigned long flags;
701 struct sk_buff *skb;
702 int count = 0;
703
704 spin_lock_irqsave (&q->lock, flags);
705 while (!skb_queue_empty(q)) {
706 struct skb_data *entry;
707 struct urb *urb;
708 int retval;
709
710 skb_queue_walk(q, skb) {
711 entry = (struct skb_data *) skb->cb;
712 if (entry->state != unlink_start)
713 goto found;
714 }
715 break;
716 found:
717 entry->state = unlink_start;
718 urb = entry->urb;
719
720 /*
721 * Get reference count of the URB to avoid it to be
722 * freed during usb_unlink_urb, which may trigger
723 * use-after-free problem inside usb_unlink_urb since
724 * usb_unlink_urb is always racing with .complete
725 * handler(include defer_bh).
726 */
727 usb_get_urb(urb);
728 spin_unlock_irqrestore(&q->lock, flags);
729 // during some PM-driven resume scenarios,
730 // these (async) unlinks complete immediately
731 retval = usb_unlink_urb (urb);
732 if (retval != -EINPROGRESS && retval != 0)
733 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
734 else
735 count++;
736 usb_put_urb(urb);
737 spin_lock_irqsave(&q->lock, flags);
738 }
739 spin_unlock_irqrestore (&q->lock, flags);
740 return count;
741 }
742
743 // Flush all pending rx urbs
744 // minidrivers may need to do this when the MTU changes
745
746 void usbnet_unlink_rx_urbs(struct usbnet *dev)
747 {
748 if (netif_running(dev->net)) {
749 (void) unlink_urbs (dev, &dev->rxq);
750 tasklet_schedule(&dev->bh);
751 }
752 }
753 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
754
755 /*-------------------------------------------------------------------------*/
756
757 // precondition: never called in_interrupt
758 static void usbnet_terminate_urbs(struct usbnet *dev)
759 {
760 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
761 DECLARE_WAITQUEUE(wait, current);
762 int temp;
763
764 /* ensure there are no more active urbs */
765 add_wait_queue(&unlink_wakeup, &wait);
766 set_current_state(TASK_UNINTERRUPTIBLE);
767 dev->wait = &unlink_wakeup;
768 temp = unlink_urbs(dev, &dev->txq) +
769 unlink_urbs(dev, &dev->rxq);
770
771 /* maybe wait for deletions to finish. */
772 while (!skb_queue_empty(&dev->rxq)
773 && !skb_queue_empty(&dev->txq)
774 && !skb_queue_empty(&dev->done)) {
775 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
776 set_current_state(TASK_UNINTERRUPTIBLE);
777 netif_dbg(dev, ifdown, dev->net,
778 "waited for %d urb completions\n", temp);
779 }
780 set_current_state(TASK_RUNNING);
781 dev->wait = NULL;
782 remove_wait_queue(&unlink_wakeup, &wait);
783 }
784
785 int usbnet_stop (struct net_device *net)
786 {
787 struct usbnet *dev = netdev_priv(net);
788 struct driver_info *info = dev->driver_info;
789 int retval;
790
791 clear_bit(EVENT_DEV_OPEN, &dev->flags);
792 netif_stop_queue (net);
793
794 netif_info(dev, ifdown, dev->net,
795 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
796 net->stats.rx_packets, net->stats.tx_packets,
797 net->stats.rx_errors, net->stats.tx_errors);
798
799 /* allow minidriver to stop correctly (wireless devices to turn off
800 * radio etc) */
801 if (info->stop) {
802 retval = info->stop(dev);
803 if (retval < 0)
804 netif_info(dev, ifdown, dev->net,
805 "stop fail (%d) usbnet usb-%s-%s, %s\n",
806 retval,
807 dev->udev->bus->bus_name, dev->udev->devpath,
808 info->description);
809 }
810
811 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
812 usbnet_terminate_urbs(dev);
813
814 usbnet_status_stop(dev);
815
816 usbnet_purge_paused_rxq(dev);
817
818 /* deferred work (task, timer, softirq) must also stop.
819 * can't flush_scheduled_work() until we drop rtnl (later),
820 * else workers could deadlock; so make workers a NOP.
821 */
822 dev->flags = 0;
823 del_timer_sync (&dev->delay);
824 tasklet_kill (&dev->bh);
825 if (info->manage_power &&
826 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
827 info->manage_power(dev, 0);
828 else
829 usb_autopm_put_interface(dev->intf);
830
831 return 0;
832 }
833 EXPORT_SYMBOL_GPL(usbnet_stop);
834
835 /*-------------------------------------------------------------------------*/
836
837 // posts reads, and enables write queuing
838
839 // precondition: never called in_interrupt
840
841 int usbnet_open (struct net_device *net)
842 {
843 struct usbnet *dev = netdev_priv(net);
844 int retval;
845 struct driver_info *info = dev->driver_info;
846
847 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
848 netif_info(dev, ifup, dev->net,
849 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
850 retval,
851 dev->udev->bus->bus_name,
852 dev->udev->devpath,
853 info->description);
854 goto done_nopm;
855 }
856
857 // put into "known safe" state
858 if (info->reset && (retval = info->reset (dev)) < 0) {
859 netif_info(dev, ifup, dev->net,
860 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
861 retval,
862 dev->udev->bus->bus_name,
863 dev->udev->devpath,
864 info->description);
865 goto done;
866 }
867
868 /* hard_mtu or rx_urb_size may change in reset() */
869 usbnet_update_max_qlen(dev);
870
871 // insist peer be connected
872 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
873 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
874 goto done;
875 }
876
877 /* start any status interrupt transfer */
878 if (dev->interrupt) {
879 retval = usbnet_status_start(dev, GFP_KERNEL);
880 if (retval < 0) {
881 netif_err(dev, ifup, dev->net,
882 "intr submit %d\n", retval);
883 goto done;
884 }
885 }
886
887 set_bit(EVENT_DEV_OPEN, &dev->flags);
888 netif_start_queue (net);
889 netif_info(dev, ifup, dev->net,
890 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
891 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
892 dev->net->mtu,
893 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
894 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
895 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
896 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
897 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
898 "simple");
899
900 /* reset rx error state */
901 dev->pkt_cnt = 0;
902 dev->pkt_err = 0;
903 clear_bit(EVENT_RX_KILL, &dev->flags);
904
905 // delay posting reads until we're fully open
906 tasklet_schedule (&dev->bh);
907 if (info->manage_power) {
908 retval = info->manage_power(dev, 1);
909 if (retval < 0) {
910 retval = 0;
911 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
912 } else {
913 usb_autopm_put_interface(dev->intf);
914 }
915 }
916 return retval;
917 done:
918 usb_autopm_put_interface(dev->intf);
919 done_nopm:
920 return retval;
921 }
922 EXPORT_SYMBOL_GPL(usbnet_open);
923
924 /*-------------------------------------------------------------------------*/
925
926 /* ethtool methods; minidrivers may need to add some more, but
927 * they'll probably want to use this base set.
928 */
929
930 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
931 {
932 struct usbnet *dev = netdev_priv(net);
933
934 if (!dev->mii.mdio_read)
935 return -EOPNOTSUPP;
936
937 return mii_ethtool_gset(&dev->mii, cmd);
938 }
939 EXPORT_SYMBOL_GPL(usbnet_get_settings);
940
941 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
942 {
943 struct usbnet *dev = netdev_priv(net);
944 int retval;
945
946 if (!dev->mii.mdio_write)
947 return -EOPNOTSUPP;
948
949 retval = mii_ethtool_sset(&dev->mii, cmd);
950
951 /* link speed/duplex might have changed */
952 if (dev->driver_info->link_reset)
953 dev->driver_info->link_reset(dev);
954
955 /* hard_mtu or rx_urb_size may change in link_reset() */
956 usbnet_update_max_qlen(dev);
957
958 return retval;
959
960 }
961 EXPORT_SYMBOL_GPL(usbnet_set_settings);
962
963 u32 usbnet_get_link (struct net_device *net)
964 {
965 struct usbnet *dev = netdev_priv(net);
966
967 /* If a check_connect is defined, return its result */
968 if (dev->driver_info->check_connect)
969 return dev->driver_info->check_connect (dev) == 0;
970
971 /* if the device has mii operations, use those */
972 if (dev->mii.mdio_read)
973 return mii_link_ok(&dev->mii);
974
975 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
976 return ethtool_op_get_link(net);
977 }
978 EXPORT_SYMBOL_GPL(usbnet_get_link);
979
980 int usbnet_nway_reset(struct net_device *net)
981 {
982 struct usbnet *dev = netdev_priv(net);
983
984 if (!dev->mii.mdio_write)
985 return -EOPNOTSUPP;
986
987 return mii_nway_restart(&dev->mii);
988 }
989 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
990
991 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
992 {
993 struct usbnet *dev = netdev_priv(net);
994
995 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
996 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
997 strlcpy (info->fw_version, dev->driver_info->description,
998 sizeof info->fw_version);
999 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1000 }
1001 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1002
1003 u32 usbnet_get_msglevel (struct net_device *net)
1004 {
1005 struct usbnet *dev = netdev_priv(net);
1006
1007 return dev->msg_enable;
1008 }
1009 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1010
1011 void usbnet_set_msglevel (struct net_device *net, u32 level)
1012 {
1013 struct usbnet *dev = netdev_priv(net);
1014
1015 dev->msg_enable = level;
1016 }
1017 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1018
1019 /* drivers may override default ethtool_ops in their bind() routine */
1020 static const struct ethtool_ops usbnet_ethtool_ops = {
1021 .get_settings = usbnet_get_settings,
1022 .set_settings = usbnet_set_settings,
1023 .get_link = usbnet_get_link,
1024 .nway_reset = usbnet_nway_reset,
1025 .get_drvinfo = usbnet_get_drvinfo,
1026 .get_msglevel = usbnet_get_msglevel,
1027 .set_msglevel = usbnet_set_msglevel,
1028 .get_ts_info = ethtool_op_get_ts_info,
1029 };
1030
1031 /*-------------------------------------------------------------------------*/
1032
1033 static void __handle_link_change(struct usbnet *dev)
1034 {
1035 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1036 return;
1037
1038 if (!netif_carrier_ok(dev->net)) {
1039 /* kill URBs for reading packets to save bus bandwidth */
1040 unlink_urbs(dev, &dev->rxq);
1041
1042 /*
1043 * tx_timeout will unlink URBs for sending packets and
1044 * tx queue is stopped by netcore after link becomes off
1045 */
1046 } else {
1047 /* submitting URBs for reading packets */
1048 tasklet_schedule(&dev->bh);
1049 }
1050
1051 /* hard_mtu or rx_urb_size may change during link change */
1052 usbnet_update_max_qlen(dev);
1053
1054 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1055 }
1056
1057 /* work that cannot be done in interrupt context uses keventd.
1058 *
1059 * NOTE: with 2.5 we could do more of this using completion callbacks,
1060 * especially now that control transfers can be queued.
1061 */
1062 static void
1063 kevent (struct work_struct *work)
1064 {
1065 struct usbnet *dev =
1066 container_of(work, struct usbnet, kevent);
1067 int status;
1068
1069 /* usb_clear_halt() needs a thread context */
1070 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1071 unlink_urbs (dev, &dev->txq);
1072 status = usb_autopm_get_interface(dev->intf);
1073 if (status < 0)
1074 goto fail_pipe;
1075 status = usb_clear_halt (dev->udev, dev->out);
1076 usb_autopm_put_interface(dev->intf);
1077 if (status < 0 &&
1078 status != -EPIPE &&
1079 status != -ESHUTDOWN) {
1080 if (netif_msg_tx_err (dev))
1081 fail_pipe:
1082 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1083 status);
1084 } else {
1085 clear_bit (EVENT_TX_HALT, &dev->flags);
1086 if (status != -ESHUTDOWN)
1087 netif_wake_queue (dev->net);
1088 }
1089 }
1090 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1091 unlink_urbs (dev, &dev->rxq);
1092 status = usb_autopm_get_interface(dev->intf);
1093 if (status < 0)
1094 goto fail_halt;
1095 status = usb_clear_halt (dev->udev, dev->in);
1096 usb_autopm_put_interface(dev->intf);
1097 if (status < 0 &&
1098 status != -EPIPE &&
1099 status != -ESHUTDOWN) {
1100 if (netif_msg_rx_err (dev))
1101 fail_halt:
1102 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1103 status);
1104 } else {
1105 clear_bit (EVENT_RX_HALT, &dev->flags);
1106 tasklet_schedule (&dev->bh);
1107 }
1108 }
1109
1110 /* tasklet could resubmit itself forever if memory is tight */
1111 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1112 struct urb *urb = NULL;
1113 int resched = 1;
1114
1115 if (netif_running (dev->net))
1116 urb = usb_alloc_urb (0, GFP_KERNEL);
1117 else
1118 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1119 if (urb != NULL) {
1120 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1121 status = usb_autopm_get_interface(dev->intf);
1122 if (status < 0) {
1123 usb_free_urb(urb);
1124 goto fail_lowmem;
1125 }
1126 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1127 resched = 0;
1128 usb_autopm_put_interface(dev->intf);
1129 fail_lowmem:
1130 if (resched)
1131 tasklet_schedule (&dev->bh);
1132 }
1133 }
1134
1135 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1136 struct driver_info *info = dev->driver_info;
1137 int retval = 0;
1138
1139 clear_bit (EVENT_LINK_RESET, &dev->flags);
1140 status = usb_autopm_get_interface(dev->intf);
1141 if (status < 0)
1142 goto skip_reset;
1143 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1144 usb_autopm_put_interface(dev->intf);
1145 skip_reset:
1146 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1147 retval,
1148 dev->udev->bus->bus_name,
1149 dev->udev->devpath,
1150 info->description);
1151 } else {
1152 usb_autopm_put_interface(dev->intf);
1153 }
1154
1155 /* handle link change from link resetting */
1156 __handle_link_change(dev);
1157 }
1158
1159 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1160 __handle_link_change(dev);
1161
1162 if (dev->flags)
1163 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1164 }
1165
1166 /*-------------------------------------------------------------------------*/
1167
1168 static void tx_complete (struct urb *urb)
1169 {
1170 struct sk_buff *skb = (struct sk_buff *) urb->context;
1171 struct skb_data *entry = (struct skb_data *) skb->cb;
1172 struct usbnet *dev = entry->dev;
1173
1174 if (urb->status == 0) {
1175 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1176 dev->net->stats.tx_packets++;
1177 dev->net->stats.tx_bytes += entry->length;
1178 } else {
1179 dev->net->stats.tx_errors++;
1180
1181 switch (urb->status) {
1182 case -EPIPE:
1183 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1184 break;
1185
1186 /* software-driven interface shutdown */
1187 case -ECONNRESET: // async unlink
1188 case -ESHUTDOWN: // hardware gone
1189 break;
1190
1191 // like rx, tx gets controller i/o faults during khubd delays
1192 // and so it uses the same throttling mechanism.
1193 case -EPROTO:
1194 case -ETIME:
1195 case -EILSEQ:
1196 usb_mark_last_busy(dev->udev);
1197 if (!timer_pending (&dev->delay)) {
1198 mod_timer (&dev->delay,
1199 jiffies + THROTTLE_JIFFIES);
1200 netif_dbg(dev, link, dev->net,
1201 "tx throttle %d\n", urb->status);
1202 }
1203 netif_stop_queue (dev->net);
1204 break;
1205 default:
1206 netif_dbg(dev, tx_err, dev->net,
1207 "tx err %d\n", entry->urb->status);
1208 break;
1209 }
1210 }
1211
1212 usb_autopm_put_interface_async(dev->intf);
1213 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1214 }
1215
1216 /*-------------------------------------------------------------------------*/
1217
1218 void usbnet_tx_timeout (struct net_device *net)
1219 {
1220 struct usbnet *dev = netdev_priv(net);
1221
1222 unlink_urbs (dev, &dev->txq);
1223 tasklet_schedule (&dev->bh);
1224
1225 // FIXME: device recovery -- reset?
1226 }
1227 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1228
1229 /*-------------------------------------------------------------------------*/
1230
1231 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1232 {
1233 unsigned num_sgs, total_len = 0;
1234 int i, s = 0;
1235
1236 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1237 if (num_sgs == 1)
1238 return 0;
1239
1240 /* reserve one for zero packet */
1241 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1242 GFP_ATOMIC);
1243 if (!urb->sg)
1244 return -ENOMEM;
1245
1246 urb->num_sgs = num_sgs;
1247 sg_init_table(urb->sg, urb->num_sgs + 1);
1248
1249 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1250 total_len += skb_headlen(skb);
1251
1252 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1253 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1254
1255 total_len += skb_frag_size(f);
1256 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1257 f->page_offset);
1258 }
1259 urb->transfer_buffer_length = total_len;
1260
1261 return 1;
1262 }
1263
1264 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1265 struct net_device *net)
1266 {
1267 struct usbnet *dev = netdev_priv(net);
1268 int length;
1269 struct urb *urb = NULL;
1270 struct skb_data *entry;
1271 struct driver_info *info = dev->driver_info;
1272 unsigned long flags;
1273 int retval;
1274
1275 if (skb)
1276 skb_tx_timestamp(skb);
1277
1278 // some devices want funky USB-level framing, for
1279 // win32 driver (usually) and/or hardware quirks
1280 if (info->tx_fixup) {
1281 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1282 if (!skb) {
1283 /* packet collected; minidriver waiting for more */
1284 if (info->flags & FLAG_MULTI_PACKET)
1285 goto not_drop;
1286 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1287 goto drop;
1288 }
1289 }
1290
1291 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1292 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1293 goto drop;
1294 }
1295
1296 entry = (struct skb_data *) skb->cb;
1297 entry->urb = urb;
1298 entry->dev = dev;
1299
1300 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1301 skb->data, skb->len, tx_complete, skb);
1302 if (dev->can_dma_sg) {
1303 if (build_dma_sg(skb, urb) < 0)
1304 goto drop;
1305 }
1306 length = urb->transfer_buffer_length;
1307
1308 /* don't assume the hardware handles USB_ZERO_PACKET
1309 * NOTE: strictly conforming cdc-ether devices should expect
1310 * the ZLP here, but ignore the one-byte packet.
1311 * NOTE2: CDC NCM specification is different from CDC ECM when
1312 * handling ZLP/short packets, so cdc_ncm driver will make short
1313 * packet itself if needed.
1314 */
1315 if (length % dev->maxpacket == 0) {
1316 if (!(info->flags & FLAG_SEND_ZLP)) {
1317 if (!(info->flags & FLAG_MULTI_PACKET)) {
1318 length++;
1319 if (skb_tailroom(skb) && !urb->num_sgs) {
1320 skb->data[skb->len] = 0;
1321 __skb_put(skb, 1);
1322 } else if (urb->num_sgs)
1323 sg_set_buf(&urb->sg[urb->num_sgs++],
1324 dev->padding_pkt, 1);
1325 }
1326 } else
1327 urb->transfer_flags |= URB_ZERO_PACKET;
1328 }
1329 entry->length = urb->transfer_buffer_length = length;
1330
1331 spin_lock_irqsave(&dev->txq.lock, flags);
1332 retval = usb_autopm_get_interface_async(dev->intf);
1333 if (retval < 0) {
1334 spin_unlock_irqrestore(&dev->txq.lock, flags);
1335 goto drop;
1336 }
1337
1338 #ifdef CONFIG_PM
1339 /* if this triggers the device is still a sleep */
1340 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1341 /* transmission will be done in resume */
1342 usb_anchor_urb(urb, &dev->deferred);
1343 /* no use to process more packets */
1344 netif_stop_queue(net);
1345 usb_put_urb(urb);
1346 spin_unlock_irqrestore(&dev->txq.lock, flags);
1347 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1348 goto deferred;
1349 }
1350 #endif
1351
1352 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1353 case -EPIPE:
1354 netif_stop_queue (net);
1355 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1356 usb_autopm_put_interface_async(dev->intf);
1357 break;
1358 default:
1359 usb_autopm_put_interface_async(dev->intf);
1360 netif_dbg(dev, tx_err, dev->net,
1361 "tx: submit urb err %d\n", retval);
1362 break;
1363 case 0:
1364 net->trans_start = jiffies;
1365 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1366 if (dev->txq.qlen >= TX_QLEN (dev))
1367 netif_stop_queue (net);
1368 }
1369 spin_unlock_irqrestore (&dev->txq.lock, flags);
1370
1371 if (retval) {
1372 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1373 drop:
1374 dev->net->stats.tx_dropped++;
1375 not_drop:
1376 if (skb)
1377 dev_kfree_skb_any (skb);
1378 if (urb) {
1379 kfree(urb->sg);
1380 usb_free_urb(urb);
1381 }
1382 } else
1383 netif_dbg(dev, tx_queued, dev->net,
1384 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1385 #ifdef CONFIG_PM
1386 deferred:
1387 #endif
1388 return NETDEV_TX_OK;
1389 }
1390 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1391
1392 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1393 {
1394 struct urb *urb;
1395 int i;
1396 int ret = 0;
1397
1398 /* don't refill the queue all at once */
1399 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1400 urb = usb_alloc_urb(0, flags);
1401 if (urb != NULL) {
1402 ret = rx_submit(dev, urb, flags);
1403 if (ret)
1404 goto err;
1405 } else {
1406 ret = -ENOMEM;
1407 goto err;
1408 }
1409 }
1410 err:
1411 return ret;
1412 }
1413
1414 /*-------------------------------------------------------------------------*/
1415
1416 // tasklet (work deferred from completions, in_irq) or timer
1417
1418 static void usbnet_bh (unsigned long param)
1419 {
1420 struct usbnet *dev = (struct usbnet *) param;
1421 struct sk_buff *skb;
1422 struct skb_data *entry;
1423
1424 while ((skb = skb_dequeue (&dev->done))) {
1425 entry = (struct skb_data *) skb->cb;
1426 switch (entry->state) {
1427 case rx_done:
1428 entry->state = rx_cleanup;
1429 rx_process (dev, skb);
1430 continue;
1431 case tx_done:
1432 kfree(entry->urb->sg);
1433 case rx_cleanup:
1434 usb_free_urb (entry->urb);
1435 dev_kfree_skb (skb);
1436 continue;
1437 default:
1438 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1439 }
1440 }
1441
1442 /* restart RX again after disabling due to high error rate */
1443 clear_bit(EVENT_RX_KILL, &dev->flags);
1444
1445 // waiting for all pending urbs to complete?
1446 if (dev->wait) {
1447 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1448 wake_up (dev->wait);
1449 }
1450
1451 // or are we maybe short a few urbs?
1452 } else if (netif_running (dev->net) &&
1453 netif_device_present (dev->net) &&
1454 netif_carrier_ok(dev->net) &&
1455 !timer_pending (&dev->delay) &&
1456 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1457 int temp = dev->rxq.qlen;
1458
1459 if (temp < RX_QLEN(dev)) {
1460 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1461 return;
1462 if (temp != dev->rxq.qlen)
1463 netif_dbg(dev, link, dev->net,
1464 "rxqlen %d --> %d\n",
1465 temp, dev->rxq.qlen);
1466 if (dev->rxq.qlen < RX_QLEN(dev))
1467 tasklet_schedule (&dev->bh);
1468 }
1469 if (dev->txq.qlen < TX_QLEN (dev))
1470 netif_wake_queue (dev->net);
1471 }
1472 }
1473
1474
1475 /*-------------------------------------------------------------------------
1476 *
1477 * USB Device Driver support
1478 *
1479 *-------------------------------------------------------------------------*/
1480
1481 // precondition: never called in_interrupt
1482
1483 void usbnet_disconnect (struct usb_interface *intf)
1484 {
1485 struct usbnet *dev;
1486 struct usb_device *xdev;
1487 struct net_device *net;
1488
1489 dev = usb_get_intfdata(intf);
1490 usb_set_intfdata(intf, NULL);
1491 if (!dev)
1492 return;
1493
1494 xdev = interface_to_usbdev (intf);
1495
1496 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1497 intf->dev.driver->name,
1498 xdev->bus->bus_name, xdev->devpath,
1499 dev->driver_info->description);
1500
1501 net = dev->net;
1502 unregister_netdev (net);
1503
1504 cancel_work_sync(&dev->kevent);
1505
1506 usb_scuttle_anchored_urbs(&dev->deferred);
1507
1508 if (dev->driver_info->unbind)
1509 dev->driver_info->unbind (dev, intf);
1510
1511 usb_kill_urb(dev->interrupt);
1512 usb_free_urb(dev->interrupt);
1513 kfree(dev->padding_pkt);
1514
1515 free_netdev(net);
1516 }
1517 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1518
1519 static const struct net_device_ops usbnet_netdev_ops = {
1520 .ndo_open = usbnet_open,
1521 .ndo_stop = usbnet_stop,
1522 .ndo_start_xmit = usbnet_start_xmit,
1523 .ndo_tx_timeout = usbnet_tx_timeout,
1524 .ndo_change_mtu = usbnet_change_mtu,
1525 .ndo_set_mac_address = eth_mac_addr,
1526 .ndo_validate_addr = eth_validate_addr,
1527 };
1528
1529 /*-------------------------------------------------------------------------*/
1530
1531 // precondition: never called in_interrupt
1532
1533 static struct device_type wlan_type = {
1534 .name = "wlan",
1535 };
1536
1537 static struct device_type wwan_type = {
1538 .name = "wwan",
1539 };
1540
1541 int
1542 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1543 {
1544 struct usbnet *dev;
1545 struct net_device *net;
1546 struct usb_host_interface *interface;
1547 struct driver_info *info;
1548 struct usb_device *xdev;
1549 int status;
1550 const char *name;
1551 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1552
1553 /* usbnet already took usb runtime pm, so have to enable the feature
1554 * for usb interface, otherwise usb_autopm_get_interface may return
1555 * failure if RUNTIME_PM is enabled.
1556 */
1557 if (!driver->supports_autosuspend) {
1558 driver->supports_autosuspend = 1;
1559 pm_runtime_enable(&udev->dev);
1560 }
1561
1562 name = udev->dev.driver->name;
1563 info = (struct driver_info *) prod->driver_info;
1564 if (!info) {
1565 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1566 return -ENODEV;
1567 }
1568 xdev = interface_to_usbdev (udev);
1569 interface = udev->cur_altsetting;
1570
1571 status = -ENOMEM;
1572
1573 // set up our own records
1574 net = alloc_etherdev(sizeof(*dev));
1575 if (!net)
1576 goto out;
1577
1578 /* netdev_printk() needs this so do it as early as possible */
1579 SET_NETDEV_DEV(net, &udev->dev);
1580
1581 dev = netdev_priv(net);
1582 dev->udev = xdev;
1583 dev->intf = udev;
1584 dev->driver_info = info;
1585 dev->driver_name = name;
1586 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1587 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1588 skb_queue_head_init (&dev->rxq);
1589 skb_queue_head_init (&dev->txq);
1590 skb_queue_head_init (&dev->done);
1591 skb_queue_head_init(&dev->rxq_pause);
1592 dev->bh.func = usbnet_bh;
1593 dev->bh.data = (unsigned long) dev;
1594 INIT_WORK (&dev->kevent, kevent);
1595 init_usb_anchor(&dev->deferred);
1596 dev->delay.function = usbnet_bh;
1597 dev->delay.data = (unsigned long) dev;
1598 init_timer (&dev->delay);
1599 mutex_init (&dev->phy_mutex);
1600 mutex_init(&dev->interrupt_mutex);
1601 dev->interrupt_count = 0;
1602
1603 dev->net = net;
1604 strcpy (net->name, "usb%d");
1605 memcpy (net->dev_addr, node_id, sizeof node_id);
1606
1607 /* rx and tx sides can use different message sizes;
1608 * bind() should set rx_urb_size in that case.
1609 */
1610 dev->hard_mtu = net->mtu + net->hard_header_len;
1611 #if 0
1612 // dma_supported() is deeply broken on almost all architectures
1613 // possible with some EHCI controllers
1614 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1615 net->features |= NETIF_F_HIGHDMA;
1616 #endif
1617
1618 net->netdev_ops = &usbnet_netdev_ops;
1619 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1620 net->ethtool_ops = &usbnet_ethtool_ops;
1621
1622 // allow device-specific bind/init procedures
1623 // NOTE net->name still not usable ...
1624 if (info->bind) {
1625 status = info->bind (dev, udev);
1626 if (status < 0)
1627 goto out1;
1628
1629 // heuristic: "usb%d" for links we know are two-host,
1630 // else "eth%d" when there's reasonable doubt. userspace
1631 // can rename the link if it knows better.
1632 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1633 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1634 (net->dev_addr [0] & 0x02) == 0))
1635 strcpy (net->name, "eth%d");
1636 /* WLAN devices should always be named "wlan%d" */
1637 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1638 strcpy(net->name, "wlan%d");
1639 /* WWAN devices should always be named "wwan%d" */
1640 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1641 strcpy(net->name, "wwan%d");
1642
1643 /* devices that cannot do ARP */
1644 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1645 net->flags |= IFF_NOARP;
1646
1647 /* maybe the remote can't receive an Ethernet MTU */
1648 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1649 net->mtu = dev->hard_mtu - net->hard_header_len;
1650 } else if (!info->in || !info->out)
1651 status = usbnet_get_endpoints (dev, udev);
1652 else {
1653 dev->in = usb_rcvbulkpipe (xdev, info->in);
1654 dev->out = usb_sndbulkpipe (xdev, info->out);
1655 if (!(info->flags & FLAG_NO_SETINT))
1656 status = usb_set_interface (xdev,
1657 interface->desc.bInterfaceNumber,
1658 interface->desc.bAlternateSetting);
1659 else
1660 status = 0;
1661
1662 }
1663 if (status >= 0 && dev->status)
1664 status = init_status (dev, udev);
1665 if (status < 0)
1666 goto out3;
1667
1668 if (!dev->rx_urb_size)
1669 dev->rx_urb_size = dev->hard_mtu;
1670 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1671
1672 /* let userspace know we have a random address */
1673 if (ether_addr_equal(net->dev_addr, node_id))
1674 net->addr_assign_type = NET_ADDR_RANDOM;
1675
1676 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1677 SET_NETDEV_DEVTYPE(net, &wlan_type);
1678 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1679 SET_NETDEV_DEVTYPE(net, &wwan_type);
1680
1681 /* initialize max rx_qlen and tx_qlen */
1682 usbnet_update_max_qlen(dev);
1683
1684 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1685 !(info->flags & FLAG_MULTI_PACKET)) {
1686 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1687 if (!dev->padding_pkt) {
1688 status = -ENOMEM;
1689 goto out4;
1690 }
1691 }
1692
1693 status = register_netdev (net);
1694 if (status)
1695 goto out5;
1696 netif_info(dev, probe, dev->net,
1697 "register '%s' at usb-%s-%s, %s, %pM\n",
1698 udev->dev.driver->name,
1699 xdev->bus->bus_name, xdev->devpath,
1700 dev->driver_info->description,
1701 net->dev_addr);
1702
1703 // ok, it's ready to go.
1704 usb_set_intfdata (udev, dev);
1705
1706 netif_device_attach (net);
1707
1708 if (dev->driver_info->flags & FLAG_LINK_INTR)
1709 usbnet_link_change(dev, 0, 0);
1710
1711 return 0;
1712
1713 out5:
1714 kfree(dev->padding_pkt);
1715 out4:
1716 usb_free_urb(dev->interrupt);
1717 out3:
1718 if (info->unbind)
1719 info->unbind (dev, udev);
1720 out1:
1721 free_netdev(net);
1722 out:
1723 return status;
1724 }
1725 EXPORT_SYMBOL_GPL(usbnet_probe);
1726
1727 /*-------------------------------------------------------------------------*/
1728
1729 /*
1730 * suspend the whole driver as soon as the first interface is suspended
1731 * resume only when the last interface is resumed
1732 */
1733
1734 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1735 {
1736 struct usbnet *dev = usb_get_intfdata(intf);
1737
1738 if (!dev->suspend_count++) {
1739 spin_lock_irq(&dev->txq.lock);
1740 /* don't autosuspend while transmitting */
1741 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1742 dev->suspend_count--;
1743 spin_unlock_irq(&dev->txq.lock);
1744 return -EBUSY;
1745 } else {
1746 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1747 spin_unlock_irq(&dev->txq.lock);
1748 }
1749 /*
1750 * accelerate emptying of the rx and queues, to avoid
1751 * having everything error out.
1752 */
1753 netif_device_detach (dev->net);
1754 usbnet_terminate_urbs(dev);
1755 __usbnet_status_stop_force(dev);
1756
1757 /*
1758 * reattach so runtime management can use and
1759 * wake the device
1760 */
1761 netif_device_attach (dev->net);
1762 }
1763 return 0;
1764 }
1765 EXPORT_SYMBOL_GPL(usbnet_suspend);
1766
1767 int usbnet_resume (struct usb_interface *intf)
1768 {
1769 struct usbnet *dev = usb_get_intfdata(intf);
1770 struct sk_buff *skb;
1771 struct urb *res;
1772 int retval;
1773
1774 if (!--dev->suspend_count) {
1775 /* resume interrupt URB if it was previously submitted */
1776 __usbnet_status_start_force(dev, GFP_NOIO);
1777
1778 spin_lock_irq(&dev->txq.lock);
1779 while ((res = usb_get_from_anchor(&dev->deferred))) {
1780
1781 skb = (struct sk_buff *)res->context;
1782 retval = usb_submit_urb(res, GFP_ATOMIC);
1783 if (retval < 0) {
1784 dev_kfree_skb_any(skb);
1785 kfree(res->sg);
1786 usb_free_urb(res);
1787 usb_autopm_put_interface_async(dev->intf);
1788 } else {
1789 dev->net->trans_start = jiffies;
1790 __skb_queue_tail(&dev->txq, skb);
1791 }
1792 }
1793
1794 smp_mb();
1795 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1796 spin_unlock_irq(&dev->txq.lock);
1797
1798 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1799 /* handle remote wakeup ASAP */
1800 if (!dev->wait &&
1801 netif_device_present(dev->net) &&
1802 !timer_pending(&dev->delay) &&
1803 !test_bit(EVENT_RX_HALT, &dev->flags))
1804 rx_alloc_submit(dev, GFP_NOIO);
1805
1806 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1807 netif_tx_wake_all_queues(dev->net);
1808 tasklet_schedule (&dev->bh);
1809 }
1810 }
1811
1812 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1813 usb_autopm_get_interface_no_resume(intf);
1814
1815 return 0;
1816 }
1817 EXPORT_SYMBOL_GPL(usbnet_resume);
1818
1819 /*
1820 * Either a subdriver implements manage_power, then it is assumed to always
1821 * be ready to be suspended or it reports the readiness to be suspended
1822 * explicitly
1823 */
1824 void usbnet_device_suggests_idle(struct usbnet *dev)
1825 {
1826 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1827 dev->intf->needs_remote_wakeup = 1;
1828 usb_autopm_put_interface_async(dev->intf);
1829 }
1830 }
1831 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1832
1833 /*
1834 * For devices that can do without special commands
1835 */
1836 int usbnet_manage_power(struct usbnet *dev, int on)
1837 {
1838 dev->intf->needs_remote_wakeup = on;
1839 return 0;
1840 }
1841 EXPORT_SYMBOL(usbnet_manage_power);
1842
1843 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1844 {
1845 /* update link after link is reseted */
1846 if (link && !need_reset)
1847 netif_carrier_on(dev->net);
1848 else
1849 netif_carrier_off(dev->net);
1850
1851 if (need_reset && link)
1852 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1853 else
1854 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1855 }
1856 EXPORT_SYMBOL(usbnet_link_change);
1857
1858 /*-------------------------------------------------------------------------*/
1859 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1860 u16 value, u16 index, void *data, u16 size)
1861 {
1862 void *buf = NULL;
1863 int err = -ENOMEM;
1864
1865 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1866 " value=0x%04x index=0x%04x size=%d\n",
1867 cmd, reqtype, value, index, size);
1868
1869 if (data) {
1870 buf = kmalloc(size, GFP_KERNEL);
1871 if (!buf)
1872 goto out;
1873 }
1874
1875 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1876 cmd, reqtype, value, index, buf, size,
1877 USB_CTRL_GET_TIMEOUT);
1878 if (err > 0 && err <= size)
1879 memcpy(data, buf, err);
1880 kfree(buf);
1881 out:
1882 return err;
1883 }
1884
1885 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1886 u16 value, u16 index, const void *data,
1887 u16 size)
1888 {
1889 void *buf = NULL;
1890 int err = -ENOMEM;
1891
1892 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1893 " value=0x%04x index=0x%04x size=%d\n",
1894 cmd, reqtype, value, index, size);
1895
1896 if (data) {
1897 buf = kmemdup(data, size, GFP_KERNEL);
1898 if (!buf)
1899 goto out;
1900 }
1901
1902 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1903 cmd, reqtype, value, index, buf, size,
1904 USB_CTRL_SET_TIMEOUT);
1905 kfree(buf);
1906
1907 out:
1908 return err;
1909 }
1910
1911 /*
1912 * The function can't be called inside suspend/resume callback,
1913 * otherwise deadlock will be caused.
1914 */
1915 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1916 u16 value, u16 index, void *data, u16 size)
1917 {
1918 int ret;
1919
1920 if (usb_autopm_get_interface(dev->intf) < 0)
1921 return -ENODEV;
1922 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1923 data, size);
1924 usb_autopm_put_interface(dev->intf);
1925 return ret;
1926 }
1927 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1928
1929 /*
1930 * The function can't be called inside suspend/resume callback,
1931 * otherwise deadlock will be caused.
1932 */
1933 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1934 u16 value, u16 index, const void *data, u16 size)
1935 {
1936 int ret;
1937
1938 if (usb_autopm_get_interface(dev->intf) < 0)
1939 return -ENODEV;
1940 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1941 data, size);
1942 usb_autopm_put_interface(dev->intf);
1943 return ret;
1944 }
1945 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1946
1947 /*
1948 * The function can be called inside suspend/resume callback safely
1949 * and should only be called by suspend/resume callback generally.
1950 */
1951 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1952 u16 value, u16 index, void *data, u16 size)
1953 {
1954 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1955 data, size);
1956 }
1957 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1958
1959 /*
1960 * The function can be called inside suspend/resume callback safely
1961 * and should only be called by suspend/resume callback generally.
1962 */
1963 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1964 u16 value, u16 index, const void *data,
1965 u16 size)
1966 {
1967 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1968 data, size);
1969 }
1970 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1971
1972 static void usbnet_async_cmd_cb(struct urb *urb)
1973 {
1974 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1975 int status = urb->status;
1976
1977 if (status < 0)
1978 dev_dbg(&urb->dev->dev, "%s failed with %d",
1979 __func__, status);
1980
1981 kfree(req);
1982 usb_free_urb(urb);
1983 }
1984
1985 /*
1986 * The caller must make sure that device can't be put into suspend
1987 * state until the control URB completes.
1988 */
1989 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1990 u16 value, u16 index, const void *data, u16 size)
1991 {
1992 struct usb_ctrlrequest *req = NULL;
1993 struct urb *urb;
1994 int err = -ENOMEM;
1995 void *buf = NULL;
1996
1997 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1998 " value=0x%04x index=0x%04x size=%d\n",
1999 cmd, reqtype, value, index, size);
2000
2001 urb = usb_alloc_urb(0, GFP_ATOMIC);
2002 if (!urb) {
2003 netdev_err(dev->net, "Error allocating URB in"
2004 " %s!\n", __func__);
2005 goto fail;
2006 }
2007
2008 if (data) {
2009 buf = kmemdup(data, size, GFP_ATOMIC);
2010 if (!buf) {
2011 netdev_err(dev->net, "Error allocating buffer"
2012 " in %s!\n", __func__);
2013 goto fail_free;
2014 }
2015 }
2016
2017 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2018 if (!req)
2019 goto fail_free_buf;
2020
2021 req->bRequestType = reqtype;
2022 req->bRequest = cmd;
2023 req->wValue = cpu_to_le16(value);
2024 req->wIndex = cpu_to_le16(index);
2025 req->wLength = cpu_to_le16(size);
2026
2027 usb_fill_control_urb(urb, dev->udev,
2028 usb_sndctrlpipe(dev->udev, 0),
2029 (void *)req, buf, size,
2030 usbnet_async_cmd_cb, req);
2031 urb->transfer_flags |= URB_FREE_BUFFER;
2032
2033 err = usb_submit_urb(urb, GFP_ATOMIC);
2034 if (err < 0) {
2035 netdev_err(dev->net, "Error submitting the control"
2036 " message: status=%d\n", err);
2037 goto fail_free;
2038 }
2039 return 0;
2040
2041 fail_free_buf:
2042 kfree(buf);
2043 fail_free:
2044 kfree(req);
2045 usb_free_urb(urb);
2046 fail:
2047 return err;
2048
2049 }
2050 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2051 /*-------------------------------------------------------------------------*/
2052
2053 static int __init usbnet_init(void)
2054 {
2055 /* Compiler should optimize this out. */
2056 BUILD_BUG_ON(
2057 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2058
2059 eth_random_addr(node_id);
2060 return 0;
2061 }
2062 module_init(usbnet_init);
2063
2064 static void __exit usbnet_exit(void)
2065 {
2066 }
2067 module_exit(usbnet_exit);
2068
2069 MODULE_AUTHOR("David Brownell");
2070 MODULE_DESCRIPTION("USB network driver framework");
2071 MODULE_LICENSE("GPL");
Linux with added FPC-III support