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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / net / usb / usbnet.c
blob1d4da74595f9c8f0a5aff1964ae70088eb067bfd
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
49
50 #define DRIVER_VERSION "22-Aug-2005"
51
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * The goal is to let the USB host controller be busy for 5msec or
63 * more before an irq is required, under load. Jumbograms change
64 * the equation.
65 */
66 #define MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) ((dev)->rx_qlen)
68 #define TX_QLEN(dev) ((dev)->tx_qlen)
69
70 // reawaken network queue this soon after stopping; else watchdog barks
71 #define TX_TIMEOUT_JIFFIES (5*HZ)
72
73 // throttle rx/tx briefly after some faults, so khubd might disconnect()
74 // us (it polls at HZ/4 usually) before we report too many false errors.
75 #define THROTTLE_JIFFIES (HZ/8)
76
77 // between wakeups
78 #define UNLINK_TIMEOUT_MS 3
79
80 /*-------------------------------------------------------------------------*/
81
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
84
85 static const char driver_name [] = "usbnet";
86
87 /* use ethtool to change the level for any given device */
88 static int msg_level = -1;
89 module_param (msg_level, int, 0);
90 MODULE_PARM_DESC (msg_level, "Override default message level");
91
92 /*-------------------------------------------------------------------------*/
93
94 /* handles CDC Ethernet and many other network "bulk data" interfaces */
95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96 {
97 int tmp;
98 struct usb_host_interface *alt = NULL;
99 struct usb_host_endpoint *in = NULL, *out = NULL;
100 struct usb_host_endpoint *status = NULL;
101
102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 unsigned ep;
104
105 in = out = status = NULL;
106 alt = intf->altsetting + tmp;
107
108 /* take the first altsetting with in-bulk + out-bulk;
109 * remember any status endpoint, just in case;
110 * ignore other endpoints and altsettings.
111 */
112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
113 struct usb_host_endpoint *e;
114 int intr = 0;
115
116 e = alt->endpoint + ep;
117 switch (e->desc.bmAttributes) {
118 case USB_ENDPOINT_XFER_INT:
119 if (!usb_endpoint_dir_in(&e->desc))
120 continue;
121 intr = 1;
122 /* FALLTHROUGH */
123 case USB_ENDPOINT_XFER_BULK:
124 break;
125 default:
126 continue;
127 }
128 if (usb_endpoint_dir_in(&e->desc)) {
129 if (!intr && !in)
130 in = e;
131 else if (intr && !status)
132 status = e;
133 } else {
134 if (!out)
135 out = e;
136 }
137 }
138 if (in && out)
139 break;
140 }
141 if (!alt || !in || !out)
142 return -EINVAL;
143
144 if (alt->desc.bAlternateSetting != 0 ||
145 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
147 alt->desc.bAlternateSetting);
148 if (tmp < 0)
149 return tmp;
150 }
151
152 dev->in = usb_rcvbulkpipe (dev->udev,
153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->out = usb_sndbulkpipe (dev->udev,
155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->status = status;
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
160
161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
162 {
163 int tmp, i;
164 unsigned char buf [13];
165
166 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
167 if (tmp != 12) {
168 dev_dbg(&dev->udev->dev,
169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
170 if (tmp >= 0)
171 tmp = -EINVAL;
172 return tmp;
173 }
174 for (i = tmp = 0; i < 6; i++, tmp += 2)
175 dev->net->dev_addr [i] =
176 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
177 return 0;
178 }
179 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
180
181 static void intr_complete (struct urb *urb)
182 {
183 struct usbnet *dev = urb->context;
184 int status = urb->status;
185
186 switch (status) {
187 /* success */
188 case 0:
189 dev->driver_info->status(dev, urb);
190 break;
191
192 /* software-driven interface shutdown */
193 case -ENOENT: /* urb killed */
194 case -ESHUTDOWN: /* hardware gone */
195 netif_dbg(dev, ifdown, dev->net,
196 "intr shutdown, code %d\n", status);
197 return;
198
199 /* NOTE: not throttling like RX/TX, since this endpoint
200 * already polls infrequently
201 */
202 default:
203 netdev_dbg(dev->net, "intr status %d\n", status);
204 break;
205 }
206
207 status = usb_submit_urb (urb, GFP_ATOMIC);
208 if (status != 0)
209 netif_err(dev, timer, dev->net,
210 "intr resubmit --> %d\n", status);
211 }
212
213 static int init_status (struct usbnet *dev, struct usb_interface *intf)
214 {
215 char *buf = NULL;
216 unsigned pipe = 0;
217 unsigned maxp;
218 unsigned period;
219
220 if (!dev->driver_info->status)
221 return 0;
222
223 pipe = usb_rcvintpipe (dev->udev,
224 dev->status->desc.bEndpointAddress
225 & USB_ENDPOINT_NUMBER_MASK);
226 maxp = usb_maxpacket (dev->udev, pipe, 0);
227
228 /* avoid 1 msec chatter: min 8 msec poll rate */
229 period = max ((int) dev->status->desc.bInterval,
230 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
231
232 buf = kmalloc (maxp, GFP_KERNEL);
233 if (buf) {
234 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
235 if (!dev->interrupt) {
236 kfree (buf);
237 return -ENOMEM;
238 } else {
239 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
240 buf, maxp, intr_complete, dev, period);
241 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
242 dev_dbg(&intf->dev,
243 "status ep%din, %d bytes period %d\n",
244 usb_pipeendpoint(pipe), maxp, period);
245 }
246 }
247 return 0;
248 }
249
250 /* Submit the interrupt URB if not previously submitted, increasing refcount */
251 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
252 {
253 int ret = 0;
254
255 WARN_ON_ONCE(dev->interrupt == NULL);
256 if (dev->interrupt) {
257 mutex_lock(&dev->interrupt_mutex);
258
259 if (++dev->interrupt_count == 1)
260 ret = usb_submit_urb(dev->interrupt, mem_flags);
261
262 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
263 dev->interrupt_count);
264 mutex_unlock(&dev->interrupt_mutex);
265 }
266 return ret;
267 }
268 EXPORT_SYMBOL_GPL(usbnet_status_start);
269
270 /* For resume; submit interrupt URB if previously submitted */
271 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
272 {
273 int ret = 0;
274
275 mutex_lock(&dev->interrupt_mutex);
276 if (dev->interrupt_count) {
277 ret = usb_submit_urb(dev->interrupt, mem_flags);
278 dev_dbg(&dev->udev->dev,
279 "submitted interrupt URB for resume\n");
280 }
281 mutex_unlock(&dev->interrupt_mutex);
282 return ret;
283 }
284
285 /* Kill the interrupt URB if all submitters want it killed */
286 void usbnet_status_stop(struct usbnet *dev)
287 {
288 if (dev->interrupt) {
289 mutex_lock(&dev->interrupt_mutex);
290 WARN_ON(dev->interrupt_count == 0);
291
292 if (dev->interrupt_count && --dev->interrupt_count == 0)
293 usb_kill_urb(dev->interrupt);
294
295 dev_dbg(&dev->udev->dev,
296 "decremented interrupt URB count to %d\n",
297 dev->interrupt_count);
298 mutex_unlock(&dev->interrupt_mutex);
299 }
300 }
301 EXPORT_SYMBOL_GPL(usbnet_status_stop);
302
303 /* For suspend; always kill interrupt URB */
304 static void __usbnet_status_stop_force(struct usbnet *dev)
305 {
306 if (dev->interrupt) {
307 mutex_lock(&dev->interrupt_mutex);
308 usb_kill_urb(dev->interrupt);
309 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
310 mutex_unlock(&dev->interrupt_mutex);
311 }
312 }
313
314 /* Passes this packet up the stack, updating its accounting.
315 * Some link protocols batch packets, so their rx_fixup paths
316 * can return clones as well as just modify the original skb.
317 */
318 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
319 {
320 int status;
321
322 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
323 skb_queue_tail(&dev->rxq_pause, skb);
324 return;
325 }
326
327 skb->protocol = eth_type_trans (skb, dev->net);
328 dev->net->stats.rx_packets++;
329 dev->net->stats.rx_bytes += skb->len;
330
331 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
332 skb->len + sizeof (struct ethhdr), skb->protocol);
333 memset (skb->cb, 0, sizeof (struct skb_data));
334
335 if (skb_defer_rx_timestamp(skb))
336 return;
337
338 status = netif_rx (skb);
339 if (status != NET_RX_SUCCESS)
340 netif_dbg(dev, rx_err, dev->net,
341 "netif_rx status %d\n", status);
342 }
343 EXPORT_SYMBOL_GPL(usbnet_skb_return);
344
345 /* must be called if hard_mtu or rx_urb_size changed */
346 void usbnet_update_max_qlen(struct usbnet *dev)
347 {
348 enum usb_device_speed speed = dev->udev->speed;
349
350 switch (speed) {
351 case USB_SPEED_HIGH:
352 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
353 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
354 break;
355 case USB_SPEED_SUPER:
356 /*
357 * Not take default 5ms qlen for super speed HC to
358 * save memory, and iperf tests show 2.5ms qlen can
359 * work well
360 */
361 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
362 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
363 break;
364 default:
365 dev->rx_qlen = dev->tx_qlen = 4;
366 }
367 }
368 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
369
370 \f
371 /*-------------------------------------------------------------------------
372 *
373 * Network Device Driver (peer link to "Host Device", from USB host)
374 *
375 *-------------------------------------------------------------------------*/
376
377 int usbnet_change_mtu (struct net_device *net, int new_mtu)
378 {
379 struct usbnet *dev = netdev_priv(net);
380 int ll_mtu = new_mtu + net->hard_header_len;
381 int old_hard_mtu = dev->hard_mtu;
382 int old_rx_urb_size = dev->rx_urb_size;
383
384 if (new_mtu <= 0)
385 return -EINVAL;
386 // no second zero-length packet read wanted after mtu-sized packets
387 if ((ll_mtu % dev->maxpacket) == 0)
388 return -EDOM;
389 net->mtu = new_mtu;
390
391 dev->hard_mtu = net->mtu + net->hard_header_len;
392 if (dev->rx_urb_size == old_hard_mtu) {
393 dev->rx_urb_size = dev->hard_mtu;
394 if (dev->rx_urb_size > old_rx_urb_size)
395 usbnet_unlink_rx_urbs(dev);
396 }
397
398 /* max qlen depend on hard_mtu and rx_urb_size */
399 usbnet_update_max_qlen(dev);
400
401 return 0;
402 }
403 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
404
405 /* The caller must hold list->lock */
406 static void __usbnet_queue_skb(struct sk_buff_head *list,
407 struct sk_buff *newsk, enum skb_state state)
408 {
409 struct skb_data *entry = (struct skb_data *) newsk->cb;
410
411 __skb_queue_tail(list, newsk);
412 entry->state = state;
413 }
414
415 /*-------------------------------------------------------------------------*/
416
417 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
418 * completion callbacks. 2.5 should have fixed those bugs...
419 */
420
421 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
422 struct sk_buff_head *list, enum skb_state state)
423 {
424 unsigned long flags;
425 enum skb_state old_state;
426 struct skb_data *entry = (struct skb_data *) skb->cb;
427
428 spin_lock_irqsave(&list->lock, flags);
429 old_state = entry->state;
430 entry->state = state;
431 __skb_unlink(skb, list);
432 spin_unlock(&list->lock);
433 spin_lock(&dev->done.lock);
434 __skb_queue_tail(&dev->done, skb);
435 if (dev->done.qlen == 1)
436 tasklet_schedule(&dev->bh);
437 spin_unlock_irqrestore(&dev->done.lock, flags);
438 return old_state;
439 }
440
441 /* some work can't be done in tasklets, so we use keventd
442 *
443 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
444 * but tasklet_schedule() doesn't. hope the failure is rare.
445 */
446 void usbnet_defer_kevent (struct usbnet *dev, int work)
447 {
448 set_bit (work, &dev->flags);
449 if (!schedule_work (&dev->kevent)) {
450 if (net_ratelimit())
451 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
452 } else {
453 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
454 }
455 }
456 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
457
458 /*-------------------------------------------------------------------------*/
459
460 static void rx_complete (struct urb *urb);
461
462 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
463 {
464 struct sk_buff *skb;
465 struct skb_data *entry;
466 int retval = 0;
467 unsigned long lockflags;
468 size_t size = dev->rx_urb_size;
469
470 /* prevent rx skb allocation when error ratio is high */
471 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
472 usb_free_urb(urb);
473 return -ENOLINK;
474 }
475
476 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
477 if (!skb) {
478 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
479 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
480 usb_free_urb (urb);
481 return -ENOMEM;
482 }
483
484 entry = (struct skb_data *) skb->cb;
485 entry->urb = urb;
486 entry->dev = dev;
487 entry->length = 0;
488
489 usb_fill_bulk_urb (urb, dev->udev, dev->in,
490 skb->data, size, rx_complete, skb);
491
492 spin_lock_irqsave (&dev->rxq.lock, lockflags);
493
494 if (netif_running (dev->net) &&
495 netif_device_present (dev->net) &&
496 !test_bit (EVENT_RX_HALT, &dev->flags) &&
497 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
498 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
499 case -EPIPE:
500 usbnet_defer_kevent (dev, EVENT_RX_HALT);
501 break;
502 case -ENOMEM:
503 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
504 break;
505 case -ENODEV:
506 netif_dbg(dev, ifdown, dev->net, "device gone\n");
507 netif_device_detach (dev->net);
508 break;
509 case -EHOSTUNREACH:
510 retval = -ENOLINK;
511 break;
512 default:
513 netif_dbg(dev, rx_err, dev->net,
514 "rx submit, %d\n", retval);
515 tasklet_schedule (&dev->bh);
516 break;
517 case 0:
518 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
519 }
520 } else {
521 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
522 retval = -ENOLINK;
523 }
524 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
525 if (retval) {
526 dev_kfree_skb_any (skb);
527 usb_free_urb (urb);
528 }
529 return retval;
530 }
531
532
533 /*-------------------------------------------------------------------------*/
534
535 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
536 {
537 if (dev->driver_info->rx_fixup &&
538 !dev->driver_info->rx_fixup (dev, skb)) {
539 /* With RX_ASSEMBLE, rx_fixup() must update counters */
540 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
541 dev->net->stats.rx_errors++;
542 goto done;
543 }
544 // else network stack removes extra byte if we forced a short packet
545
546 /* all data was already cloned from skb inside the driver */
547 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
548 goto done;
549
550 if (skb->len < ETH_HLEN) {
551 dev->net->stats.rx_errors++;
552 dev->net->stats.rx_length_errors++;
553 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
554 } else {
555 usbnet_skb_return(dev, skb);
556 return;
557 }
558
559 done:
560 skb_queue_tail(&dev->done, skb);
561 }
562
563 /*-------------------------------------------------------------------------*/
564
565 static void rx_complete (struct urb *urb)
566 {
567 struct sk_buff *skb = (struct sk_buff *) urb->context;
568 struct skb_data *entry = (struct skb_data *) skb->cb;
569 struct usbnet *dev = entry->dev;
570 int urb_status = urb->status;
571 enum skb_state state;
572
573 skb_put (skb, urb->actual_length);
574 state = rx_done;
575 entry->urb = NULL;
576
577 switch (urb_status) {
578 /* success */
579 case 0:
580 break;
581
582 /* stalls need manual reset. this is rare ... except that
583 * when going through USB 2.0 TTs, unplug appears this way.
584 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
585 * storm, recovering as needed.
586 */
587 case -EPIPE:
588 dev->net->stats.rx_errors++;
589 usbnet_defer_kevent (dev, EVENT_RX_HALT);
590 // FALLTHROUGH
591
592 /* software-driven interface shutdown */
593 case -ECONNRESET: /* async unlink */
594 case -ESHUTDOWN: /* hardware gone */
595 netif_dbg(dev, ifdown, dev->net,
596 "rx shutdown, code %d\n", urb_status);
597 goto block;
598
599 /* we get controller i/o faults during khubd disconnect() delays.
600 * throttle down resubmits, to avoid log floods; just temporarily,
601 * so we still recover when the fault isn't a khubd delay.
602 */
603 case -EPROTO:
604 case -ETIME:
605 case -EILSEQ:
606 dev->net->stats.rx_errors++;
607 if (!timer_pending (&dev->delay)) {
608 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
609 netif_dbg(dev, link, dev->net,
610 "rx throttle %d\n", urb_status);
611 }
612 block:
613 state = rx_cleanup;
614 entry->urb = urb;
615 urb = NULL;
616 break;
617
618 /* data overrun ... flush fifo? */
619 case -EOVERFLOW:
620 dev->net->stats.rx_over_errors++;
621 // FALLTHROUGH
622
623 default:
624 state = rx_cleanup;
625 dev->net->stats.rx_errors++;
626 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
627 break;
628 }
629
630 /* stop rx if packet error rate is high */
631 if (++dev->pkt_cnt > 30) {
632 dev->pkt_cnt = 0;
633 dev->pkt_err = 0;
634 } else {
635 if (state == rx_cleanup)
636 dev->pkt_err++;
637 if (dev->pkt_err > 20)
638 set_bit(EVENT_RX_KILL, &dev->flags);
639 }
640
641 state = defer_bh(dev, skb, &dev->rxq, state);
642
643 if (urb) {
644 if (netif_running (dev->net) &&
645 !test_bit (EVENT_RX_HALT, &dev->flags) &&
646 state != unlink_start) {
647 rx_submit (dev, urb, GFP_ATOMIC);
648 usb_mark_last_busy(dev->udev);
649 return;
650 }
651 usb_free_urb (urb);
652 }
653 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
654 }
655
656 /*-------------------------------------------------------------------------*/
657 void usbnet_pause_rx(struct usbnet *dev)
658 {
659 set_bit(EVENT_RX_PAUSED, &dev->flags);
660
661 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
662 }
663 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
664
665 void usbnet_resume_rx(struct usbnet *dev)
666 {
667 struct sk_buff *skb;
668 int num = 0;
669
670 clear_bit(EVENT_RX_PAUSED, &dev->flags);
671
672 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
673 usbnet_skb_return(dev, skb);
674 num++;
675 }
676
677 tasklet_schedule(&dev->bh);
678
679 netif_dbg(dev, rx_status, dev->net,
680 "paused rx queue disabled, %d skbs requeued\n", num);
681 }
682 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
683
684 void usbnet_purge_paused_rxq(struct usbnet *dev)
685 {
686 skb_queue_purge(&dev->rxq_pause);
687 }
688 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
689
690 /*-------------------------------------------------------------------------*/
691
692 // unlink pending rx/tx; completion handlers do all other cleanup
693
694 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
695 {
696 unsigned long flags;
697 struct sk_buff *skb;
698 int count = 0;
699
700 spin_lock_irqsave (&q->lock, flags);
701 while (!skb_queue_empty(q)) {
702 struct skb_data *entry;
703 struct urb *urb;
704 int retval;
705
706 skb_queue_walk(q, skb) {
707 entry = (struct skb_data *) skb->cb;
708 if (entry->state != unlink_start)
709 goto found;
710 }
711 break;
712 found:
713 entry->state = unlink_start;
714 urb = entry->urb;
715
716 /*
717 * Get reference count of the URB to avoid it to be
718 * freed during usb_unlink_urb, which may trigger
719 * use-after-free problem inside usb_unlink_urb since
720 * usb_unlink_urb is always racing with .complete
721 * handler(include defer_bh).
722 */
723 usb_get_urb(urb);
724 spin_unlock_irqrestore(&q->lock, flags);
725 // during some PM-driven resume scenarios,
726 // these (async) unlinks complete immediately
727 retval = usb_unlink_urb (urb);
728 if (retval != -EINPROGRESS && retval != 0)
729 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
730 else
731 count++;
732 usb_put_urb(urb);
733 spin_lock_irqsave(&q->lock, flags);
734 }
735 spin_unlock_irqrestore (&q->lock, flags);
736 return count;
737 }
738
739 // Flush all pending rx urbs
740 // minidrivers may need to do this when the MTU changes
741
742 void usbnet_unlink_rx_urbs(struct usbnet *dev)
743 {
744 if (netif_running(dev->net)) {
745 (void) unlink_urbs (dev, &dev->rxq);
746 tasklet_schedule(&dev->bh);
747 }
748 }
749 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
750
751 /*-------------------------------------------------------------------------*/
752
753 // precondition: never called in_interrupt
754 static void usbnet_terminate_urbs(struct usbnet *dev)
755 {
756 DECLARE_WAITQUEUE(wait, current);
757 int temp;
758
759 /* ensure there are no more active urbs */
760 add_wait_queue(&dev->wait, &wait);
761 set_current_state(TASK_UNINTERRUPTIBLE);
762 temp = unlink_urbs(dev, &dev->txq) +
763 unlink_urbs(dev, &dev->rxq);
764
765 /* maybe wait for deletions to finish. */
766 while (!skb_queue_empty(&dev->rxq)
767 && !skb_queue_empty(&dev->txq)
768 && !skb_queue_empty(&dev->done)) {
769 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
770 set_current_state(TASK_UNINTERRUPTIBLE);
771 netif_dbg(dev, ifdown, dev->net,
772 "waited for %d urb completions\n", temp);
773 }
774 set_current_state(TASK_RUNNING);
775 remove_wait_queue(&dev->wait, &wait);
776 }
777
778 int usbnet_stop (struct net_device *net)
779 {
780 struct usbnet *dev = netdev_priv(net);
781 struct driver_info *info = dev->driver_info;
782 int retval, pm;
783
784 clear_bit(EVENT_DEV_OPEN, &dev->flags);
785 netif_stop_queue (net);
786
787 netif_info(dev, ifdown, dev->net,
788 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
789 net->stats.rx_packets, net->stats.tx_packets,
790 net->stats.rx_errors, net->stats.tx_errors);
791
792 /* to not race resume */
793 pm = usb_autopm_get_interface(dev->intf);
794 /* allow minidriver to stop correctly (wireless devices to turn off
795 * radio etc) */
796 if (info->stop) {
797 retval = info->stop(dev);
798 if (retval < 0)
799 netif_info(dev, ifdown, dev->net,
800 "stop fail (%d) usbnet usb-%s-%s, %s\n",
801 retval,
802 dev->udev->bus->bus_name, dev->udev->devpath,
803 info->description);
804 }
805
806 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
807 usbnet_terminate_urbs(dev);
808
809 usbnet_status_stop(dev);
810
811 usbnet_purge_paused_rxq(dev);
812
813 /* deferred work (task, timer, softirq) must also stop.
814 * can't flush_scheduled_work() until we drop rtnl (later),
815 * else workers could deadlock; so make workers a NOP.
816 */
817 dev->flags = 0;
818 del_timer_sync (&dev->delay);
819 tasklet_kill (&dev->bh);
820 if (!pm)
821 usb_autopm_put_interface(dev->intf);
822
823 if (info->manage_power &&
824 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
825 info->manage_power(dev, 0);
826 else
827 usb_autopm_put_interface(dev->intf);
828
829 return 0;
830 }
831 EXPORT_SYMBOL_GPL(usbnet_stop);
832
833 /*-------------------------------------------------------------------------*/
834
835 // posts reads, and enables write queuing
836
837 // precondition: never called in_interrupt
838
839 int usbnet_open (struct net_device *net)
840 {
841 struct usbnet *dev = netdev_priv(net);
842 int retval;
843 struct driver_info *info = dev->driver_info;
844
845 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
846 netif_info(dev, ifup, dev->net,
847 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
848 retval,
849 dev->udev->bus->bus_name,
850 dev->udev->devpath,
851 info->description);
852 goto done_nopm;
853 }
854
855 // put into "known safe" state
856 if (info->reset && (retval = info->reset (dev)) < 0) {
857 netif_info(dev, ifup, dev->net,
858 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
859 retval,
860 dev->udev->bus->bus_name,
861 dev->udev->devpath,
862 info->description);
863 goto done;
864 }
865
866 /* hard_mtu or rx_urb_size may change in reset() */
867 usbnet_update_max_qlen(dev);
868
869 // insist peer be connected
870 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
871 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
872 goto done;
873 }
874
875 /* start any status interrupt transfer */
876 if (dev->interrupt) {
877 retval = usbnet_status_start(dev, GFP_KERNEL);
878 if (retval < 0) {
879 netif_err(dev, ifup, dev->net,
880 "intr submit %d\n", retval);
881 goto done;
882 }
883 }
884
885 set_bit(EVENT_DEV_OPEN, &dev->flags);
886 netif_start_queue (net);
887 netif_info(dev, ifup, dev->net,
888 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
889 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
890 dev->net->mtu,
891 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
892 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
893 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
894 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
895 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
896 "simple");
897
898 /* reset rx error state */
899 dev->pkt_cnt = 0;
900 dev->pkt_err = 0;
901 clear_bit(EVENT_RX_KILL, &dev->flags);
902
903 // delay posting reads until we're fully open
904 tasklet_schedule (&dev->bh);
905 if (info->manage_power) {
906 retval = info->manage_power(dev, 1);
907 if (retval < 0) {
908 retval = 0;
909 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
910 } else {
911 usb_autopm_put_interface(dev->intf);
912 }
913 }
914 return retval;
915 done:
916 usb_autopm_put_interface(dev->intf);
917 done_nopm:
918 return retval;
919 }
920 EXPORT_SYMBOL_GPL(usbnet_open);
921
922 /*-------------------------------------------------------------------------*/
923
924 /* ethtool methods; minidrivers may need to add some more, but
925 * they'll probably want to use this base set.
926 */
927
928 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
929 {
930 struct usbnet *dev = netdev_priv(net);
931
932 if (!dev->mii.mdio_read)
933 return -EOPNOTSUPP;
934
935 return mii_ethtool_gset(&dev->mii, cmd);
936 }
937 EXPORT_SYMBOL_GPL(usbnet_get_settings);
938
939 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
940 {
941 struct usbnet *dev = netdev_priv(net);
942 int retval;
943
944 if (!dev->mii.mdio_write)
945 return -EOPNOTSUPP;
946
947 retval = mii_ethtool_sset(&dev->mii, cmd);
948
949 /* link speed/duplex might have changed */
950 if (dev->driver_info->link_reset)
951 dev->driver_info->link_reset(dev);
952
953 /* hard_mtu or rx_urb_size may change in link_reset() */
954 usbnet_update_max_qlen(dev);
955
956 return retval;
957
958 }
959 EXPORT_SYMBOL_GPL(usbnet_set_settings);
960
961 u32 usbnet_get_link (struct net_device *net)
962 {
963 struct usbnet *dev = netdev_priv(net);
964
965 /* If a check_connect is defined, return its result */
966 if (dev->driver_info->check_connect)
967 return dev->driver_info->check_connect (dev) == 0;
968
969 /* if the device has mii operations, use those */
970 if (dev->mii.mdio_read)
971 return mii_link_ok(&dev->mii);
972
973 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
974 return ethtool_op_get_link(net);
975 }
976 EXPORT_SYMBOL_GPL(usbnet_get_link);
977
978 int usbnet_nway_reset(struct net_device *net)
979 {
980 struct usbnet *dev = netdev_priv(net);
981
982 if (!dev->mii.mdio_write)
983 return -EOPNOTSUPP;
984
985 return mii_nway_restart(&dev->mii);
986 }
987 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
988
989 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
990 {
991 struct usbnet *dev = netdev_priv(net);
992
993 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
994 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
995 strlcpy (info->fw_version, dev->driver_info->description,
996 sizeof info->fw_version);
997 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
998 }
999 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1000
1001 u32 usbnet_get_msglevel (struct net_device *net)
1002 {
1003 struct usbnet *dev = netdev_priv(net);
1004
1005 return dev->msg_enable;
1006 }
1007 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1008
1009 void usbnet_set_msglevel (struct net_device *net, u32 level)
1010 {
1011 struct usbnet *dev = netdev_priv(net);
1012
1013 dev->msg_enable = level;
1014 }
1015 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1016
1017 /* drivers may override default ethtool_ops in their bind() routine */
1018 static const struct ethtool_ops usbnet_ethtool_ops = {
1019 .get_settings = usbnet_get_settings,
1020 .set_settings = usbnet_set_settings,
1021 .get_link = usbnet_get_link,
1022 .nway_reset = usbnet_nway_reset,
1023 .get_drvinfo = usbnet_get_drvinfo,
1024 .get_msglevel = usbnet_get_msglevel,
1025 .set_msglevel = usbnet_set_msglevel,
1026 .get_ts_info = ethtool_op_get_ts_info,
1027 };
1028
1029 /*-------------------------------------------------------------------------*/
1030
1031 static void __handle_link_change(struct usbnet *dev)
1032 {
1033 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1034 return;
1035
1036 if (!netif_carrier_ok(dev->net)) {
1037 /* kill URBs for reading packets to save bus bandwidth */
1038 unlink_urbs(dev, &dev->rxq);
1039
1040 /*
1041 * tx_timeout will unlink URBs for sending packets and
1042 * tx queue is stopped by netcore after link becomes off
1043 */
1044 } else {
1045 /* submitting URBs for reading packets */
1046 tasklet_schedule(&dev->bh);
1047 }
1048
1049 /* hard_mtu or rx_urb_size may change during link change */
1050 usbnet_update_max_qlen(dev);
1051
1052 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1053 }
1054
1055 /* work that cannot be done in interrupt context uses keventd.
1056 *
1057 * NOTE: with 2.5 we could do more of this using completion callbacks,
1058 * especially now that control transfers can be queued.
1059 */
1060 static void
1061 kevent (struct work_struct *work)
1062 {
1063 struct usbnet *dev =
1064 container_of(work, struct usbnet, kevent);
1065 int status;
1066
1067 /* usb_clear_halt() needs a thread context */
1068 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1069 unlink_urbs (dev, &dev->txq);
1070 status = usb_autopm_get_interface(dev->intf);
1071 if (status < 0)
1072 goto fail_pipe;
1073 status = usb_clear_halt (dev->udev, dev->out);
1074 usb_autopm_put_interface(dev->intf);
1075 if (status < 0 &&
1076 status != -EPIPE &&
1077 status != -ESHUTDOWN) {
1078 if (netif_msg_tx_err (dev))
1079 fail_pipe:
1080 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1081 status);
1082 } else {
1083 clear_bit (EVENT_TX_HALT, &dev->flags);
1084 if (status != -ESHUTDOWN)
1085 netif_wake_queue (dev->net);
1086 }
1087 }
1088 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1089 unlink_urbs (dev, &dev->rxq);
1090 status = usb_autopm_get_interface(dev->intf);
1091 if (status < 0)
1092 goto fail_halt;
1093 status = usb_clear_halt (dev->udev, dev->in);
1094 usb_autopm_put_interface(dev->intf);
1095 if (status < 0 &&
1096 status != -EPIPE &&
1097 status != -ESHUTDOWN) {
1098 if (netif_msg_rx_err (dev))
1099 fail_halt:
1100 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1101 status);
1102 } else {
1103 clear_bit (EVENT_RX_HALT, &dev->flags);
1104 tasklet_schedule (&dev->bh);
1105 }
1106 }
1107
1108 /* tasklet could resubmit itself forever if memory is tight */
1109 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1110 struct urb *urb = NULL;
1111 int resched = 1;
1112
1113 if (netif_running (dev->net))
1114 urb = usb_alloc_urb (0, GFP_KERNEL);
1115 else
1116 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1117 if (urb != NULL) {
1118 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1119 status = usb_autopm_get_interface(dev->intf);
1120 if (status < 0) {
1121 usb_free_urb(urb);
1122 goto fail_lowmem;
1123 }
1124 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1125 resched = 0;
1126 usb_autopm_put_interface(dev->intf);
1127 fail_lowmem:
1128 if (resched)
1129 tasklet_schedule (&dev->bh);
1130 }
1131 }
1132
1133 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1134 struct driver_info *info = dev->driver_info;
1135 int retval = 0;
1136
1137 clear_bit (EVENT_LINK_RESET, &dev->flags);
1138 status = usb_autopm_get_interface(dev->intf);
1139 if (status < 0)
1140 goto skip_reset;
1141 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1142 usb_autopm_put_interface(dev->intf);
1143 skip_reset:
1144 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1145 retval,
1146 dev->udev->bus->bus_name,
1147 dev->udev->devpath,
1148 info->description);
1149 } else {
1150 usb_autopm_put_interface(dev->intf);
1151 }
1152
1153 /* handle link change from link resetting */
1154 __handle_link_change(dev);
1155 }
1156
1157 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1158 __handle_link_change(dev);
1159
1160 if (dev->flags)
1161 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1162 }
1163
1164 /*-------------------------------------------------------------------------*/
1165
1166 static void tx_complete (struct urb *urb)
1167 {
1168 struct sk_buff *skb = (struct sk_buff *) urb->context;
1169 struct skb_data *entry = (struct skb_data *) skb->cb;
1170 struct usbnet *dev = entry->dev;
1171
1172 if (urb->status == 0) {
1173 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1174 dev->net->stats.tx_packets++;
1175 dev->net->stats.tx_bytes += entry->length;
1176 } else {
1177 dev->net->stats.tx_errors++;
1178
1179 switch (urb->status) {
1180 case -EPIPE:
1181 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1182 break;
1183
1184 /* software-driven interface shutdown */
1185 case -ECONNRESET: // async unlink
1186 case -ESHUTDOWN: // hardware gone
1187 break;
1188
1189 // like rx, tx gets controller i/o faults during khubd delays
1190 // and so it uses the same throttling mechanism.
1191 case -EPROTO:
1192 case -ETIME:
1193 case -EILSEQ:
1194 usb_mark_last_busy(dev->udev);
1195 if (!timer_pending (&dev->delay)) {
1196 mod_timer (&dev->delay,
1197 jiffies + THROTTLE_JIFFIES);
1198 netif_dbg(dev, link, dev->net,
1199 "tx throttle %d\n", urb->status);
1200 }
1201 netif_stop_queue (dev->net);
1202 break;
1203 default:
1204 netif_dbg(dev, tx_err, dev->net,
1205 "tx err %d\n", entry->urb->status);
1206 break;
1207 }
1208 }
1209
1210 usb_autopm_put_interface_async(dev->intf);
1211 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1212 }
1213
1214 /*-------------------------------------------------------------------------*/
1215
1216 void usbnet_tx_timeout (struct net_device *net)
1217 {
1218 struct usbnet *dev = netdev_priv(net);
1219
1220 unlink_urbs (dev, &dev->txq);
1221 tasklet_schedule (&dev->bh);
1222
1223 // FIXME: device recovery -- reset?
1224 }
1225 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1226
1227 /*-------------------------------------------------------------------------*/
1228
1229 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1230 {
1231 unsigned num_sgs, total_len = 0;
1232 int i, s = 0;
1233
1234 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1235 if (num_sgs == 1)
1236 return 0;
1237
1238 /* reserve one for zero packet */
1239 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1240 GFP_ATOMIC);
1241 if (!urb->sg)
1242 return -ENOMEM;
1243
1244 urb->num_sgs = num_sgs;
1245 sg_init_table(urb->sg, urb->num_sgs + 1);
1246
1247 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1248 total_len += skb_headlen(skb);
1249
1250 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1251 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1252
1253 total_len += skb_frag_size(f);
1254 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1255 f->page_offset);
1256 }
1257 urb->transfer_buffer_length = total_len;
1258
1259 return 1;
1260 }
1261
1262 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1263 struct net_device *net)
1264 {
1265 struct usbnet *dev = netdev_priv(net);
1266 int length;
1267 struct urb *urb = NULL;
1268 struct skb_data *entry;
1269 struct driver_info *info = dev->driver_info;
1270 unsigned long flags;
1271 int retval;
1272
1273 if (skb)
1274 skb_tx_timestamp(skb);
1275
1276 // some devices want funky USB-level framing, for
1277 // win32 driver (usually) and/or hardware quirks
1278 if (info->tx_fixup) {
1279 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1280 if (!skb) {
1281 /* packet collected; minidriver waiting for more */
1282 if (info->flags & FLAG_MULTI_PACKET)
1283 goto not_drop;
1284 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1285 goto drop;
1286 }
1287 }
1288
1289 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1290 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1291 goto drop;
1292 }
1293
1294 entry = (struct skb_data *) skb->cb;
1295 entry->urb = urb;
1296 entry->dev = dev;
1297
1298 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1299 skb->data, skb->len, tx_complete, skb);
1300 if (dev->can_dma_sg) {
1301 if (build_dma_sg(skb, urb) < 0)
1302 goto drop;
1303 }
1304 length = urb->transfer_buffer_length;
1305
1306 /* don't assume the hardware handles USB_ZERO_PACKET
1307 * NOTE: strictly conforming cdc-ether devices should expect
1308 * the ZLP here, but ignore the one-byte packet.
1309 * NOTE2: CDC NCM specification is different from CDC ECM when
1310 * handling ZLP/short packets, so cdc_ncm driver will make short
1311 * packet itself if needed.
1312 */
1313 if (length % dev->maxpacket == 0) {
1314 if (!(info->flags & FLAG_SEND_ZLP)) {
1315 if (!(info->flags & FLAG_MULTI_PACKET)) {
1316 length++;
1317 if (skb_tailroom(skb) && !urb->num_sgs) {
1318 skb->data[skb->len] = 0;
1319 __skb_put(skb, 1);
1320 } else if (urb->num_sgs)
1321 sg_set_buf(&urb->sg[urb->num_sgs++],
1322 dev->padding_pkt, 1);
1323 }
1324 } else
1325 urb->transfer_flags |= URB_ZERO_PACKET;
1326 }
1327 entry->length = urb->transfer_buffer_length = length;
1328
1329 spin_lock_irqsave(&dev->txq.lock, flags);
1330 retval = usb_autopm_get_interface_async(dev->intf);
1331 if (retval < 0) {
1332 spin_unlock_irqrestore(&dev->txq.lock, flags);
1333 goto drop;
1334 }
1335
1336 #ifdef CONFIG_PM
1337 /* if this triggers the device is still a sleep */
1338 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1339 /* transmission will be done in resume */
1340 usb_anchor_urb(urb, &dev->deferred);
1341 /* no use to process more packets */
1342 netif_stop_queue(net);
1343 usb_put_urb(urb);
1344 spin_unlock_irqrestore(&dev->txq.lock, flags);
1345 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1346 goto deferred;
1347 }
1348 #endif
1349
1350 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1351 case -EPIPE:
1352 netif_stop_queue (net);
1353 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1354 usb_autopm_put_interface_async(dev->intf);
1355 break;
1356 default:
1357 usb_autopm_put_interface_async(dev->intf);
1358 netif_dbg(dev, tx_err, dev->net,
1359 "tx: submit urb err %d\n", retval);
1360 break;
1361 case 0:
1362 net->trans_start = jiffies;
1363 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1364 if (dev->txq.qlen >= TX_QLEN (dev))
1365 netif_stop_queue (net);
1366 }
1367 spin_unlock_irqrestore (&dev->txq.lock, flags);
1368
1369 if (retval) {
1370 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1371 drop:
1372 dev->net->stats.tx_dropped++;
1373 not_drop:
1374 if (skb)
1375 dev_kfree_skb_any (skb);
1376 if (urb) {
1377 kfree(urb->sg);
1378 usb_free_urb(urb);
1379 }
1380 } else
1381 netif_dbg(dev, tx_queued, dev->net,
1382 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1383 #ifdef CONFIG_PM
1384 deferred:
1385 #endif
1386 return NETDEV_TX_OK;
1387 }
1388 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1389
1390 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1391 {
1392 struct urb *urb;
1393 int i;
1394 int ret = 0;
1395
1396 /* don't refill the queue all at once */
1397 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1398 urb = usb_alloc_urb(0, flags);
1399 if (urb != NULL) {
1400 ret = rx_submit(dev, urb, flags);
1401 if (ret)
1402 goto err;
1403 } else {
1404 ret = -ENOMEM;
1405 goto err;
1406 }
1407 }
1408 err:
1409 return ret;
1410 }
1411
1412 /*-------------------------------------------------------------------------*/
1413
1414 // tasklet (work deferred from completions, in_irq) or timer
1415
1416 static void usbnet_bh (unsigned long param)
1417 {
1418 struct usbnet *dev = (struct usbnet *) param;
1419 struct sk_buff *skb;
1420 struct skb_data *entry;
1421
1422 while ((skb = skb_dequeue (&dev->done))) {
1423 entry = (struct skb_data *) skb->cb;
1424 switch (entry->state) {
1425 case rx_done:
1426 entry->state = rx_cleanup;
1427 rx_process (dev, skb);
1428 continue;
1429 case tx_done:
1430 kfree(entry->urb->sg);
1431 case rx_cleanup:
1432 usb_free_urb (entry->urb);
1433 dev_kfree_skb (skb);
1434 continue;
1435 default:
1436 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1437 }
1438 }
1439
1440 /* restart RX again after disabling due to high error rate */
1441 clear_bit(EVENT_RX_KILL, &dev->flags);
1442
1443 /* waiting for all pending urbs to complete?
1444 * only then can we forgo submitting anew
1445 */
1446 if (waitqueue_active(&dev->wait)) {
1447 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1448 wake_up_all(&dev->wait);
1449
1450 // or are we maybe short a few urbs?
1451 } else if (netif_running (dev->net) &&
1452 netif_device_present (dev->net) &&
1453 netif_carrier_ok(dev->net) &&
1454 !timer_pending (&dev->delay) &&
1455 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1456 int temp = dev->rxq.qlen;
1457
1458 if (temp < RX_QLEN(dev)) {
1459 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1460 return;
1461 if (temp != dev->rxq.qlen)
1462 netif_dbg(dev, link, dev->net,
1463 "rxqlen %d --> %d\n",
1464 temp, dev->rxq.qlen);
1465 if (dev->rxq.qlen < RX_QLEN(dev))
1466 tasklet_schedule (&dev->bh);
1467 }
1468 if (dev->txq.qlen < TX_QLEN (dev))
1469 netif_wake_queue (dev->net);
1470 }
1471 }
1472
1473
1474 /*-------------------------------------------------------------------------
1475 *
1476 * USB Device Driver support
1477 *
1478 *-------------------------------------------------------------------------*/
1479
1480 // precondition: never called in_interrupt
1481
1482 void usbnet_disconnect (struct usb_interface *intf)
1483 {
1484 struct usbnet *dev;
1485 struct usb_device *xdev;
1486 struct net_device *net;
1487
1488 dev = usb_get_intfdata(intf);
1489 usb_set_intfdata(intf, NULL);
1490 if (!dev)
1491 return;
1492
1493 xdev = interface_to_usbdev (intf);
1494
1495 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1496 intf->dev.driver->name,
1497 xdev->bus->bus_name, xdev->devpath,
1498 dev->driver_info->description);
1499
1500 net = dev->net;
1501 unregister_netdev (net);
1502
1503 cancel_work_sync(&dev->kevent);
1504
1505 usb_scuttle_anchored_urbs(&dev->deferred);
1506
1507 if (dev->driver_info->unbind)
1508 dev->driver_info->unbind (dev, intf);
1509
1510 usb_kill_urb(dev->interrupt);
1511 usb_free_urb(dev->interrupt);
1512 kfree(dev->padding_pkt);
1513
1514 free_netdev(net);
1515 }
1516 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1517
1518 static const struct net_device_ops usbnet_netdev_ops = {
1519 .ndo_open = usbnet_open,
1520 .ndo_stop = usbnet_stop,
1521 .ndo_start_xmit = usbnet_start_xmit,
1522 .ndo_tx_timeout = usbnet_tx_timeout,
1523 .ndo_change_mtu = usbnet_change_mtu,
1524 .ndo_set_mac_address = eth_mac_addr,
1525 .ndo_validate_addr = eth_validate_addr,
1526 };
1527
1528 /*-------------------------------------------------------------------------*/
1529
1530 // precondition: never called in_interrupt
1531
1532 static struct device_type wlan_type = {
1533 .name = "wlan",
1534 };
1535
1536 static struct device_type wwan_type = {
1537 .name = "wwan",
1538 };
1539
1540 int
1541 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1542 {
1543 struct usbnet *dev;
1544 struct net_device *net;
1545 struct usb_host_interface *interface;
1546 struct driver_info *info;
1547 struct usb_device *xdev;
1548 int status;
1549 const char *name;
1550 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1551
1552 /* usbnet already took usb runtime pm, so have to enable the feature
1553 * for usb interface, otherwise usb_autopm_get_interface may return
1554 * failure if RUNTIME_PM is enabled.
1555 */
1556 if (!driver->supports_autosuspend) {
1557 driver->supports_autosuspend = 1;
1558 pm_runtime_enable(&udev->dev);
1559 }
1560
1561 name = udev->dev.driver->name;
1562 info = (struct driver_info *) prod->driver_info;
1563 if (!info) {
1564 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1565 return -ENODEV;
1566 }
1567 xdev = interface_to_usbdev (udev);
1568 interface = udev->cur_altsetting;
1569
1570 status = -ENOMEM;
1571
1572 // set up our own records
1573 net = alloc_etherdev(sizeof(*dev));
1574 if (!net)
1575 goto out;
1576
1577 /* netdev_printk() needs this so do it as early as possible */
1578 SET_NETDEV_DEV(net, &udev->dev);
1579
1580 dev = netdev_priv(net);
1581 dev->udev = xdev;
1582 dev->intf = udev;
1583 dev->driver_info = info;
1584 dev->driver_name = name;
1585 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1586 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1587 init_waitqueue_head(&dev->wait);
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 * we cannot race against stop
1801 */
1802 if (netif_device_present(dev->net) &&
1803 !timer_pending(&dev->delay) &&
1804 !test_bit(EVENT_RX_HALT, &dev->flags))
1805 rx_alloc_submit(dev, GFP_NOIO);
1806
1807 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1808 netif_tx_wake_all_queues(dev->net);
1809 tasklet_schedule (&dev->bh);
1810 }
1811 }
1812
1813 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1814 usb_autopm_get_interface_no_resume(intf);
1815
1816 return 0;
1817 }
1818 EXPORT_SYMBOL_GPL(usbnet_resume);
1819
1820 /*
1821 * Either a subdriver implements manage_power, then it is assumed to always
1822 * be ready to be suspended or it reports the readiness to be suspended
1823 * explicitly
1824 */
1825 void usbnet_device_suggests_idle(struct usbnet *dev)
1826 {
1827 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1828 dev->intf->needs_remote_wakeup = 1;
1829 usb_autopm_put_interface_async(dev->intf);
1830 }
1831 }
1832 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1833
1834 /*
1835 * For devices that can do without special commands
1836 */
1837 int usbnet_manage_power(struct usbnet *dev, int on)
1838 {
1839 dev->intf->needs_remote_wakeup = on;
1840 return 0;
1841 }
1842 EXPORT_SYMBOL(usbnet_manage_power);
1843
1844 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1845 {
1846 /* update link after link is reseted */
1847 if (link && !need_reset)
1848 netif_carrier_on(dev->net);
1849 else
1850 netif_carrier_off(dev->net);
1851
1852 if (need_reset && link)
1853 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1854 else
1855 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1856 }
1857 EXPORT_SYMBOL(usbnet_link_change);
1858
1859 /*-------------------------------------------------------------------------*/
1860 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1861 u16 value, u16 index, void *data, u16 size)
1862 {
1863 void *buf = NULL;
1864 int err = -ENOMEM;
1865
1866 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1867 " value=0x%04x index=0x%04x size=%d\n",
1868 cmd, reqtype, value, index, size);
1869
1870 if (data) {
1871 buf = kmalloc(size, GFP_KERNEL);
1872 if (!buf)
1873 goto out;
1874 }
1875
1876 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1877 cmd, reqtype, value, index, buf, size,
1878 USB_CTRL_GET_TIMEOUT);
1879 if (err > 0 && err <= size)
1880 memcpy(data, buf, err);
1881 kfree(buf);
1882 out:
1883 return err;
1884 }
1885
1886 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1887 u16 value, u16 index, const void *data,
1888 u16 size)
1889 {
1890 void *buf = NULL;
1891 int err = -ENOMEM;
1892
1893 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1894 " value=0x%04x index=0x%04x size=%d\n",
1895 cmd, reqtype, value, index, size);
1896
1897 if (data) {
1898 buf = kmemdup(data, size, GFP_KERNEL);
1899 if (!buf)
1900 goto out;
1901 }
1902
1903 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1904 cmd, reqtype, value, index, buf, size,
1905 USB_CTRL_SET_TIMEOUT);
1906 kfree(buf);
1907
1908 out:
1909 return err;
1910 }
1911
1912 /*
1913 * The function can't be called inside suspend/resume callback,
1914 * otherwise deadlock will be caused.
1915 */
1916 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1917 u16 value, u16 index, void *data, u16 size)
1918 {
1919 int ret;
1920
1921 if (usb_autopm_get_interface(dev->intf) < 0)
1922 return -ENODEV;
1923 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1924 data, size);
1925 usb_autopm_put_interface(dev->intf);
1926 return ret;
1927 }
1928 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1929
1930 /*
1931 * The function can't be called inside suspend/resume callback,
1932 * otherwise deadlock will be caused.
1933 */
1934 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1935 u16 value, u16 index, const void *data, u16 size)
1936 {
1937 int ret;
1938
1939 if (usb_autopm_get_interface(dev->intf) < 0)
1940 return -ENODEV;
1941 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1942 data, size);
1943 usb_autopm_put_interface(dev->intf);
1944 return ret;
1945 }
1946 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1947
1948 /*
1949 * The function can be called inside suspend/resume callback safely
1950 * and should only be called by suspend/resume callback generally.
1951 */
1952 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1953 u16 value, u16 index, void *data, u16 size)
1954 {
1955 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1956 data, size);
1957 }
1958 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1959
1960 /*
1961 * The function can be called inside suspend/resume callback safely
1962 * and should only be called by suspend/resume callback generally.
1963 */
1964 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1965 u16 value, u16 index, const void *data,
1966 u16 size)
1967 {
1968 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1969 data, size);
1970 }
1971 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1972
1973 static void usbnet_async_cmd_cb(struct urb *urb)
1974 {
1975 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1976 int status = urb->status;
1977
1978 if (status < 0)
1979 dev_dbg(&urb->dev->dev, "%s failed with %d",
1980 __func__, status);
1981
1982 kfree(req);
1983 usb_free_urb(urb);
1984 }
1985
1986 /*
1987 * The caller must make sure that device can't be put into suspend
1988 * state until the control URB completes.
1989 */
1990 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1991 u16 value, u16 index, const void *data, u16 size)
1992 {
1993 struct usb_ctrlrequest *req = NULL;
1994 struct urb *urb;
1995 int err = -ENOMEM;
1996 void *buf = NULL;
1997
1998 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1999 " value=0x%04x index=0x%04x size=%d\n",
2000 cmd, reqtype, value, index, size);
2001
2002 urb = usb_alloc_urb(0, GFP_ATOMIC);
2003 if (!urb) {
2004 netdev_err(dev->net, "Error allocating URB in"
2005 " %s!\n", __func__);
2006 goto fail;
2007 }
2008
2009 if (data) {
2010 buf = kmemdup(data, size, GFP_ATOMIC);
2011 if (!buf) {
2012 netdev_err(dev->net, "Error allocating buffer"
2013 " in %s!\n", __func__);
2014 goto fail_free;
2015 }
2016 }
2017
2018 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2019 if (!req)
2020 goto fail_free_buf;
2021
2022 req->bRequestType = reqtype;
2023 req->bRequest = cmd;
2024 req->wValue = cpu_to_le16(value);
2025 req->wIndex = cpu_to_le16(index);
2026 req->wLength = cpu_to_le16(size);
2027
2028 usb_fill_control_urb(urb, dev->udev,
2029 usb_sndctrlpipe(dev->udev, 0),
2030 (void *)req, buf, size,
2031 usbnet_async_cmd_cb, req);
2032 urb->transfer_flags |= URB_FREE_BUFFER;
2033
2034 err = usb_submit_urb(urb, GFP_ATOMIC);
2035 if (err < 0) {
2036 netdev_err(dev->net, "Error submitting the control"
2037 " message: status=%d\n", err);
2038 goto fail_free;
2039 }
2040 return 0;
2041
2042 fail_free_buf:
2043 kfree(buf);
2044 fail_free:
2045 kfree(req);
2046 usb_free_urb(urb);
2047 fail:
2048 return err;
2049
2050 }
2051 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2052 /*-------------------------------------------------------------------------*/
2053
2054 static int __init usbnet_init(void)
2055 {
2056 /* Compiler should optimize this out. */
2057 BUILD_BUG_ON(
2058 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2059
2060 eth_random_addr(node_id);
2061 return 0;
2062 }
2063 module_init(usbnet_init);
2064
2065 static void __exit usbnet_exit(void)
2066 {
2067 }
2068 module_exit(usbnet_exit);
2069
2070 MODULE_AUTHOR("David Brownell");
2071 MODULE_DESCRIPTION("USB network driver framework");
2072 MODULE_LICENSE("GPL");
Linux with added FPC-III support