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Merge branch 'pm-cpu'
[deliverable/linux.git] / drivers / net / usb / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
24 *
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
31
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/usb/cdc.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 hub_wq might disconnect()
74 * us (it polls at HZ/4 usually) before we report too many false errors.
75 */
76 #define THROTTLE_JIFFIES (HZ/8)
77
78 // between wakeups
79 #define UNLINK_TIMEOUT_MS 3
80
81 /*-------------------------------------------------------------------------*/
82
83 // randomly generated ethernet address
84 static u8 node_id [ETH_ALEN];
85
86 static const char driver_name [] = "usbnet";
87
88 /* use ethtool to change the level for any given device */
89 static int msg_level = -1;
90 module_param (msg_level, int, 0);
91 MODULE_PARM_DESC (msg_level, "Override default message level");
92
93 /*-------------------------------------------------------------------------*/
94
95 /* handles CDC Ethernet and many other network "bulk data" interfaces */
96 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
97 {
98 int tmp;
99 struct usb_host_interface *alt = NULL;
100 struct usb_host_endpoint *in = NULL, *out = NULL;
101 struct usb_host_endpoint *status = NULL;
102
103 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
104 unsigned ep;
105
106 in = out = status = NULL;
107 alt = intf->altsetting + tmp;
108
109 /* take the first altsetting with in-bulk + out-bulk;
110 * remember any status endpoint, just in case;
111 * ignore other endpoints and altsettings.
112 */
113 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
114 struct usb_host_endpoint *e;
115 int intr = 0;
116
117 e = alt->endpoint + ep;
118 switch (e->desc.bmAttributes) {
119 case USB_ENDPOINT_XFER_INT:
120 if (!usb_endpoint_dir_in(&e->desc))
121 continue;
122 intr = 1;
123 /* FALLTHROUGH */
124 case USB_ENDPOINT_XFER_BULK:
125 break;
126 default:
127 continue;
128 }
129 if (usb_endpoint_dir_in(&e->desc)) {
130 if (!intr && !in)
131 in = e;
132 else if (intr && !status)
133 status = e;
134 } else {
135 if (!out)
136 out = e;
137 }
138 }
139 if (in && out)
140 break;
141 }
142 if (!alt || !in || !out)
143 return -EINVAL;
144
145 if (alt->desc.bAlternateSetting != 0 ||
146 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
147 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
148 alt->desc.bAlternateSetting);
149 if (tmp < 0)
150 return tmp;
151 }
152
153 dev->in = usb_rcvbulkpipe (dev->udev,
154 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->out = usb_sndbulkpipe (dev->udev,
156 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
157 dev->status = status;
158 return 0;
159 }
160 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
161
162 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
163 {
164 int tmp = -1, ret;
165 unsigned char buf [13];
166
167 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
168 if (ret == 12)
169 tmp = hex2bin(dev->net->dev_addr, buf, 6);
170 if (tmp < 0) {
171 dev_dbg(&dev->udev->dev,
172 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
173 if (ret >= 0)
174 ret = -EINVAL;
175 return ret;
176 }
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 /* only update if unset to allow minidriver rx_fixup override */
328 if (skb->protocol == 0)
329 skb->protocol = eth_type_trans (skb, dev->net);
330
331 dev->net->stats.rx_packets++;
332 dev->net->stats.rx_bytes += skb->len;
333
334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
335 skb->len + sizeof (struct ethhdr), skb->protocol);
336 memset (skb->cb, 0, sizeof (struct skb_data));
337
338 if (skb_defer_rx_timestamp(skb))
339 return;
340
341 status = netif_rx (skb);
342 if (status != NET_RX_SUCCESS)
343 netif_dbg(dev, rx_err, dev->net,
344 "netif_rx status %d\n", status);
345 }
346 EXPORT_SYMBOL_GPL(usbnet_skb_return);
347
348 /* must be called if hard_mtu or rx_urb_size changed */
349 void usbnet_update_max_qlen(struct usbnet *dev)
350 {
351 enum usb_device_speed speed = dev->udev->speed;
352
353 switch (speed) {
354 case USB_SPEED_HIGH:
355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
357 break;
358 case USB_SPEED_SUPER:
359 case USB_SPEED_SUPER_PLUS:
360 /*
361 * Not take default 5ms qlen for super speed HC to
362 * save memory, and iperf tests show 2.5ms qlen can
363 * work well
364 */
365 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
366 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
367 break;
368 default:
369 dev->rx_qlen = dev->tx_qlen = 4;
370 }
371 }
372 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
373
374 \f
375 /*-------------------------------------------------------------------------
376 *
377 * Network Device Driver (peer link to "Host Device", from USB host)
378 *
379 *-------------------------------------------------------------------------*/
380
381 int usbnet_change_mtu (struct net_device *net, int new_mtu)
382 {
383 struct usbnet *dev = netdev_priv(net);
384 int ll_mtu = new_mtu + net->hard_header_len;
385 int old_hard_mtu = dev->hard_mtu;
386 int old_rx_urb_size = dev->rx_urb_size;
387
388 if (new_mtu <= 0)
389 return -EINVAL;
390 // no second zero-length packet read wanted after mtu-sized packets
391 if ((ll_mtu % dev->maxpacket) == 0)
392 return -EDOM;
393 net->mtu = new_mtu;
394
395 dev->hard_mtu = net->mtu + net->hard_header_len;
396 if (dev->rx_urb_size == old_hard_mtu) {
397 dev->rx_urb_size = dev->hard_mtu;
398 if (dev->rx_urb_size > old_rx_urb_size) {
399 usbnet_pause_rx(dev);
400 usbnet_unlink_rx_urbs(dev);
401 usbnet_resume_rx(dev);
402 }
403 }
404
405 /* max qlen depend on hard_mtu and rx_urb_size */
406 usbnet_update_max_qlen(dev);
407
408 return 0;
409 }
410 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
411
412 /* The caller must hold list->lock */
413 static void __usbnet_queue_skb(struct sk_buff_head *list,
414 struct sk_buff *newsk, enum skb_state state)
415 {
416 struct skb_data *entry = (struct skb_data *) newsk->cb;
417
418 __skb_queue_tail(list, newsk);
419 entry->state = state;
420 }
421
422 /*-------------------------------------------------------------------------*/
423
424 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
425 * completion callbacks. 2.5 should have fixed those bugs...
426 */
427
428 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
429 struct sk_buff_head *list, enum skb_state state)
430 {
431 unsigned long flags;
432 enum skb_state old_state;
433 struct skb_data *entry = (struct skb_data *) skb->cb;
434
435 spin_lock_irqsave(&list->lock, flags);
436 old_state = entry->state;
437 entry->state = state;
438 __skb_unlink(skb, list);
439
440 /* defer_bh() is never called with list == &dev->done.
441 * spin_lock_nested() tells lockdep that it is OK to take
442 * dev->done.lock here with list->lock held.
443 */
444 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
445
446 __skb_queue_tail(&dev->done, skb);
447 if (dev->done.qlen == 1)
448 tasklet_schedule(&dev->bh);
449 spin_unlock(&dev->done.lock);
450 spin_unlock_irqrestore(&list->lock, flags);
451 return old_state;
452 }
453
454 /* some work can't be done in tasklets, so we use keventd
455 *
456 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
457 * but tasklet_schedule() doesn't. hope the failure is rare.
458 */
459 void usbnet_defer_kevent (struct usbnet *dev, int work)
460 {
461 set_bit (work, &dev->flags);
462 if (!schedule_work (&dev->kevent)) {
463 if (net_ratelimit())
464 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
465 } else {
466 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
467 }
468 }
469 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
470
471 /*-------------------------------------------------------------------------*/
472
473 static void rx_complete (struct urb *urb);
474
475 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
476 {
477 struct sk_buff *skb;
478 struct skb_data *entry;
479 int retval = 0;
480 unsigned long lockflags;
481 size_t size = dev->rx_urb_size;
482
483 /* prevent rx skb allocation when error ratio is high */
484 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
485 usb_free_urb(urb);
486 return -ENOLINK;
487 }
488
489 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
490 if (!skb) {
491 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
492 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
493 usb_free_urb (urb);
494 return -ENOMEM;
495 }
496
497 entry = (struct skb_data *) skb->cb;
498 entry->urb = urb;
499 entry->dev = dev;
500 entry->length = 0;
501
502 usb_fill_bulk_urb (urb, dev->udev, dev->in,
503 skb->data, size, rx_complete, skb);
504
505 spin_lock_irqsave (&dev->rxq.lock, lockflags);
506
507 if (netif_running (dev->net) &&
508 netif_device_present (dev->net) &&
509 !test_bit (EVENT_RX_HALT, &dev->flags) &&
510 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
511 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
512 case -EPIPE:
513 usbnet_defer_kevent (dev, EVENT_RX_HALT);
514 break;
515 case -ENOMEM:
516 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
517 break;
518 case -ENODEV:
519 netif_dbg(dev, ifdown, dev->net, "device gone\n");
520 netif_device_detach (dev->net);
521 break;
522 case -EHOSTUNREACH:
523 retval = -ENOLINK;
524 break;
525 default:
526 netif_dbg(dev, rx_err, dev->net,
527 "rx submit, %d\n", retval);
528 tasklet_schedule (&dev->bh);
529 break;
530 case 0:
531 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
532 }
533 } else {
534 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
535 retval = -ENOLINK;
536 }
537 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
538 if (retval) {
539 dev_kfree_skb_any (skb);
540 usb_free_urb (urb);
541 }
542 return retval;
543 }
544
545
546 /*-------------------------------------------------------------------------*/
547
548 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
549 {
550 if (dev->driver_info->rx_fixup &&
551 !dev->driver_info->rx_fixup (dev, skb)) {
552 /* With RX_ASSEMBLE, rx_fixup() must update counters */
553 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
554 dev->net->stats.rx_errors++;
555 goto done;
556 }
557 // else network stack removes extra byte if we forced a short packet
558
559 /* all data was already cloned from skb inside the driver */
560 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
561 goto done;
562
563 if (skb->len < ETH_HLEN) {
564 dev->net->stats.rx_errors++;
565 dev->net->stats.rx_length_errors++;
566 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
567 } else {
568 usbnet_skb_return(dev, skb);
569 return;
570 }
571
572 done:
573 skb_queue_tail(&dev->done, skb);
574 }
575
576 /*-------------------------------------------------------------------------*/
577
578 static void rx_complete (struct urb *urb)
579 {
580 struct sk_buff *skb = (struct sk_buff *) urb->context;
581 struct skb_data *entry = (struct skb_data *) skb->cb;
582 struct usbnet *dev = entry->dev;
583 int urb_status = urb->status;
584 enum skb_state state;
585
586 skb_put (skb, urb->actual_length);
587 state = rx_done;
588 entry->urb = NULL;
589
590 switch (urb_status) {
591 /* success */
592 case 0:
593 break;
594
595 /* stalls need manual reset. this is rare ... except that
596 * when going through USB 2.0 TTs, unplug appears this way.
597 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
598 * storm, recovering as needed.
599 */
600 case -EPIPE:
601 dev->net->stats.rx_errors++;
602 usbnet_defer_kevent (dev, EVENT_RX_HALT);
603 // FALLTHROUGH
604
605 /* software-driven interface shutdown */
606 case -ECONNRESET: /* async unlink */
607 case -ESHUTDOWN: /* hardware gone */
608 netif_dbg(dev, ifdown, dev->net,
609 "rx shutdown, code %d\n", urb_status);
610 goto block;
611
612 /* we get controller i/o faults during hub_wq disconnect() delays.
613 * throttle down resubmits, to avoid log floods; just temporarily,
614 * so we still recover when the fault isn't a hub_wq delay.
615 */
616 case -EPROTO:
617 case -ETIME:
618 case -EILSEQ:
619 dev->net->stats.rx_errors++;
620 if (!timer_pending (&dev->delay)) {
621 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
622 netif_dbg(dev, link, dev->net,
623 "rx throttle %d\n", urb_status);
624 }
625 block:
626 state = rx_cleanup;
627 entry->urb = urb;
628 urb = NULL;
629 break;
630
631 /* data overrun ... flush fifo? */
632 case -EOVERFLOW:
633 dev->net->stats.rx_over_errors++;
634 // FALLTHROUGH
635
636 default:
637 state = rx_cleanup;
638 dev->net->stats.rx_errors++;
639 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
640 break;
641 }
642
643 /* stop rx if packet error rate is high */
644 if (++dev->pkt_cnt > 30) {
645 dev->pkt_cnt = 0;
646 dev->pkt_err = 0;
647 } else {
648 if (state == rx_cleanup)
649 dev->pkt_err++;
650 if (dev->pkt_err > 20)
651 set_bit(EVENT_RX_KILL, &dev->flags);
652 }
653
654 state = defer_bh(dev, skb, &dev->rxq, state);
655
656 if (urb) {
657 if (netif_running (dev->net) &&
658 !test_bit (EVENT_RX_HALT, &dev->flags) &&
659 state != unlink_start) {
660 rx_submit (dev, urb, GFP_ATOMIC);
661 usb_mark_last_busy(dev->udev);
662 return;
663 }
664 usb_free_urb (urb);
665 }
666 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
667 }
668
669 /*-------------------------------------------------------------------------*/
670 void usbnet_pause_rx(struct usbnet *dev)
671 {
672 set_bit(EVENT_RX_PAUSED, &dev->flags);
673
674 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
675 }
676 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
677
678 void usbnet_resume_rx(struct usbnet *dev)
679 {
680 struct sk_buff *skb;
681 int num = 0;
682
683 clear_bit(EVENT_RX_PAUSED, &dev->flags);
684
685 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
686 usbnet_skb_return(dev, skb);
687 num++;
688 }
689
690 tasklet_schedule(&dev->bh);
691
692 netif_dbg(dev, rx_status, dev->net,
693 "paused rx queue disabled, %d skbs requeued\n", num);
694 }
695 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
696
697 void usbnet_purge_paused_rxq(struct usbnet *dev)
698 {
699 skb_queue_purge(&dev->rxq_pause);
700 }
701 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
702
703 /*-------------------------------------------------------------------------*/
704
705 // unlink pending rx/tx; completion handlers do all other cleanup
706
707 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
708 {
709 unsigned long flags;
710 struct sk_buff *skb;
711 int count = 0;
712
713 spin_lock_irqsave (&q->lock, flags);
714 while (!skb_queue_empty(q)) {
715 struct skb_data *entry;
716 struct urb *urb;
717 int retval;
718
719 skb_queue_walk(q, skb) {
720 entry = (struct skb_data *) skb->cb;
721 if (entry->state != unlink_start)
722 goto found;
723 }
724 break;
725 found:
726 entry->state = unlink_start;
727 urb = entry->urb;
728
729 /*
730 * Get reference count of the URB to avoid it to be
731 * freed during usb_unlink_urb, which may trigger
732 * use-after-free problem inside usb_unlink_urb since
733 * usb_unlink_urb is always racing with .complete
734 * handler(include defer_bh).
735 */
736 usb_get_urb(urb);
737 spin_unlock_irqrestore(&q->lock, flags);
738 // during some PM-driven resume scenarios,
739 // these (async) unlinks complete immediately
740 retval = usb_unlink_urb (urb);
741 if (retval != -EINPROGRESS && retval != 0)
742 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
743 else
744 count++;
745 usb_put_urb(urb);
746 spin_lock_irqsave(&q->lock, flags);
747 }
748 spin_unlock_irqrestore (&q->lock, flags);
749 return count;
750 }
751
752 // Flush all pending rx urbs
753 // minidrivers may need to do this when the MTU changes
754
755 void usbnet_unlink_rx_urbs(struct usbnet *dev)
756 {
757 if (netif_running(dev->net)) {
758 (void) unlink_urbs (dev, &dev->rxq);
759 tasklet_schedule(&dev->bh);
760 }
761 }
762 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
763
764 /*-------------------------------------------------------------------------*/
765
766 static void wait_skb_queue_empty(struct sk_buff_head *q)
767 {
768 unsigned long flags;
769
770 spin_lock_irqsave(&q->lock, flags);
771 while (!skb_queue_empty(q)) {
772 spin_unlock_irqrestore(&q->lock, flags);
773 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
774 set_current_state(TASK_UNINTERRUPTIBLE);
775 spin_lock_irqsave(&q->lock, flags);
776 }
777 spin_unlock_irqrestore(&q->lock, flags);
778 }
779
780 // precondition: never called in_interrupt
781 static void usbnet_terminate_urbs(struct usbnet *dev)
782 {
783 DECLARE_WAITQUEUE(wait, current);
784 int temp;
785
786 /* ensure there are no more active urbs */
787 add_wait_queue(&dev->wait, &wait);
788 set_current_state(TASK_UNINTERRUPTIBLE);
789 temp = unlink_urbs(dev, &dev->txq) +
790 unlink_urbs(dev, &dev->rxq);
791
792 /* maybe wait for deletions to finish. */
793 wait_skb_queue_empty(&dev->rxq);
794 wait_skb_queue_empty(&dev->txq);
795 wait_skb_queue_empty(&dev->done);
796 netif_dbg(dev, ifdown, dev->net,
797 "waited for %d urb completions\n", temp);
798 set_current_state(TASK_RUNNING);
799 remove_wait_queue(&dev->wait, &wait);
800 }
801
802 int usbnet_stop (struct net_device *net)
803 {
804 struct usbnet *dev = netdev_priv(net);
805 struct driver_info *info = dev->driver_info;
806 int retval, pm, mpn;
807
808 clear_bit(EVENT_DEV_OPEN, &dev->flags);
809 netif_stop_queue (net);
810
811 netif_info(dev, ifdown, dev->net,
812 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
813 net->stats.rx_packets, net->stats.tx_packets,
814 net->stats.rx_errors, net->stats.tx_errors);
815
816 /* to not race resume */
817 pm = usb_autopm_get_interface(dev->intf);
818 /* allow minidriver to stop correctly (wireless devices to turn off
819 * radio etc) */
820 if (info->stop) {
821 retval = info->stop(dev);
822 if (retval < 0)
823 netif_info(dev, ifdown, dev->net,
824 "stop fail (%d) usbnet usb-%s-%s, %s\n",
825 retval,
826 dev->udev->bus->bus_name, dev->udev->devpath,
827 info->description);
828 }
829
830 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
831 usbnet_terminate_urbs(dev);
832
833 usbnet_status_stop(dev);
834
835 usbnet_purge_paused_rxq(dev);
836
837 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
838
839 /* deferred work (task, timer, softirq) must also stop.
840 * can't flush_scheduled_work() until we drop rtnl (later),
841 * else workers could deadlock; so make workers a NOP.
842 */
843 dev->flags = 0;
844 del_timer_sync (&dev->delay);
845 tasklet_kill (&dev->bh);
846 if (!pm)
847 usb_autopm_put_interface(dev->intf);
848
849 if (info->manage_power && mpn)
850 info->manage_power(dev, 0);
851 else
852 usb_autopm_put_interface(dev->intf);
853
854 return 0;
855 }
856 EXPORT_SYMBOL_GPL(usbnet_stop);
857
858 /*-------------------------------------------------------------------------*/
859
860 // posts reads, and enables write queuing
861
862 // precondition: never called in_interrupt
863
864 int usbnet_open (struct net_device *net)
865 {
866 struct usbnet *dev = netdev_priv(net);
867 int retval;
868 struct driver_info *info = dev->driver_info;
869
870 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
871 netif_info(dev, ifup, dev->net,
872 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
873 retval,
874 dev->udev->bus->bus_name,
875 dev->udev->devpath,
876 info->description);
877 goto done_nopm;
878 }
879
880 // put into "known safe" state
881 if (info->reset && (retval = info->reset (dev)) < 0) {
882 netif_info(dev, ifup, dev->net,
883 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
884 retval,
885 dev->udev->bus->bus_name,
886 dev->udev->devpath,
887 info->description);
888 goto done;
889 }
890
891 /* hard_mtu or rx_urb_size may change in reset() */
892 usbnet_update_max_qlen(dev);
893
894 // insist peer be connected
895 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
896 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
897 goto done;
898 }
899
900 /* start any status interrupt transfer */
901 if (dev->interrupt) {
902 retval = usbnet_status_start(dev, GFP_KERNEL);
903 if (retval < 0) {
904 netif_err(dev, ifup, dev->net,
905 "intr submit %d\n", retval);
906 goto done;
907 }
908 }
909
910 set_bit(EVENT_DEV_OPEN, &dev->flags);
911 netif_start_queue (net);
912 netif_info(dev, ifup, dev->net,
913 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
914 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
915 dev->net->mtu,
916 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
917 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
918 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
919 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
920 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
921 "simple");
922
923 /* reset rx error state */
924 dev->pkt_cnt = 0;
925 dev->pkt_err = 0;
926 clear_bit(EVENT_RX_KILL, &dev->flags);
927
928 // delay posting reads until we're fully open
929 tasklet_schedule (&dev->bh);
930 if (info->manage_power) {
931 retval = info->manage_power(dev, 1);
932 if (retval < 0) {
933 retval = 0;
934 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
935 } else {
936 usb_autopm_put_interface(dev->intf);
937 }
938 }
939 return retval;
940 done:
941 usb_autopm_put_interface(dev->intf);
942 done_nopm:
943 return retval;
944 }
945 EXPORT_SYMBOL_GPL(usbnet_open);
946
947 /*-------------------------------------------------------------------------*/
948
949 /* ethtool methods; minidrivers may need to add some more, but
950 * they'll probably want to use this base set.
951 */
952
953 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
954 {
955 struct usbnet *dev = netdev_priv(net);
956
957 if (!dev->mii.mdio_read)
958 return -EOPNOTSUPP;
959
960 return mii_ethtool_gset(&dev->mii, cmd);
961 }
962 EXPORT_SYMBOL_GPL(usbnet_get_settings);
963
964 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
965 {
966 struct usbnet *dev = netdev_priv(net);
967 int retval;
968
969 if (!dev->mii.mdio_write)
970 return -EOPNOTSUPP;
971
972 retval = mii_ethtool_sset(&dev->mii, cmd);
973
974 /* link speed/duplex might have changed */
975 if (dev->driver_info->link_reset)
976 dev->driver_info->link_reset(dev);
977
978 /* hard_mtu or rx_urb_size may change in link_reset() */
979 usbnet_update_max_qlen(dev);
980
981 return retval;
982
983 }
984 EXPORT_SYMBOL_GPL(usbnet_set_settings);
985
986 u32 usbnet_get_link (struct net_device *net)
987 {
988 struct usbnet *dev = netdev_priv(net);
989
990 /* If a check_connect is defined, return its result */
991 if (dev->driver_info->check_connect)
992 return dev->driver_info->check_connect (dev) == 0;
993
994 /* if the device has mii operations, use those */
995 if (dev->mii.mdio_read)
996 return mii_link_ok(&dev->mii);
997
998 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
999 return ethtool_op_get_link(net);
1000 }
1001 EXPORT_SYMBOL_GPL(usbnet_get_link);
1002
1003 int usbnet_nway_reset(struct net_device *net)
1004 {
1005 struct usbnet *dev = netdev_priv(net);
1006
1007 if (!dev->mii.mdio_write)
1008 return -EOPNOTSUPP;
1009
1010 return mii_nway_restart(&dev->mii);
1011 }
1012 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1013
1014 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1015 {
1016 struct usbnet *dev = netdev_priv(net);
1017
1018 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1019 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1020 strlcpy (info->fw_version, dev->driver_info->description,
1021 sizeof info->fw_version);
1022 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1023 }
1024 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1025
1026 u32 usbnet_get_msglevel (struct net_device *net)
1027 {
1028 struct usbnet *dev = netdev_priv(net);
1029
1030 return dev->msg_enable;
1031 }
1032 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1033
1034 void usbnet_set_msglevel (struct net_device *net, u32 level)
1035 {
1036 struct usbnet *dev = netdev_priv(net);
1037
1038 dev->msg_enable = level;
1039 }
1040 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1041
1042 /* drivers may override default ethtool_ops in their bind() routine */
1043 static const struct ethtool_ops usbnet_ethtool_ops = {
1044 .get_settings = usbnet_get_settings,
1045 .set_settings = usbnet_set_settings,
1046 .get_link = usbnet_get_link,
1047 .nway_reset = usbnet_nway_reset,
1048 .get_drvinfo = usbnet_get_drvinfo,
1049 .get_msglevel = usbnet_get_msglevel,
1050 .set_msglevel = usbnet_set_msglevel,
1051 .get_ts_info = ethtool_op_get_ts_info,
1052 };
1053
1054 /*-------------------------------------------------------------------------*/
1055
1056 static void __handle_link_change(struct usbnet *dev)
1057 {
1058 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1059 return;
1060
1061 if (!netif_carrier_ok(dev->net)) {
1062 /* kill URBs for reading packets to save bus bandwidth */
1063 unlink_urbs(dev, &dev->rxq);
1064
1065 /*
1066 * tx_timeout will unlink URBs for sending packets and
1067 * tx queue is stopped by netcore after link becomes off
1068 */
1069 } else {
1070 /* submitting URBs for reading packets */
1071 tasklet_schedule(&dev->bh);
1072 }
1073
1074 /* hard_mtu or rx_urb_size may change during link change */
1075 usbnet_update_max_qlen(dev);
1076
1077 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1078 }
1079
1080 static void usbnet_set_rx_mode(struct net_device *net)
1081 {
1082 struct usbnet *dev = netdev_priv(net);
1083
1084 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1085 }
1086
1087 static void __handle_set_rx_mode(struct usbnet *dev)
1088 {
1089 if (dev->driver_info->set_rx_mode)
1090 (dev->driver_info->set_rx_mode)(dev);
1091
1092 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1093 }
1094
1095 /* work that cannot be done in interrupt context uses keventd.
1096 *
1097 * NOTE: with 2.5 we could do more of this using completion callbacks,
1098 * especially now that control transfers can be queued.
1099 */
1100 static void
1101 usbnet_deferred_kevent (struct work_struct *work)
1102 {
1103 struct usbnet *dev =
1104 container_of(work, struct usbnet, kevent);
1105 int status;
1106
1107 /* usb_clear_halt() needs a thread context */
1108 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1109 unlink_urbs (dev, &dev->txq);
1110 status = usb_autopm_get_interface(dev->intf);
1111 if (status < 0)
1112 goto fail_pipe;
1113 status = usb_clear_halt (dev->udev, dev->out);
1114 usb_autopm_put_interface(dev->intf);
1115 if (status < 0 &&
1116 status != -EPIPE &&
1117 status != -ESHUTDOWN) {
1118 if (netif_msg_tx_err (dev))
1119 fail_pipe:
1120 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1121 status);
1122 } else {
1123 clear_bit (EVENT_TX_HALT, &dev->flags);
1124 if (status != -ESHUTDOWN)
1125 netif_wake_queue (dev->net);
1126 }
1127 }
1128 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1129 unlink_urbs (dev, &dev->rxq);
1130 status = usb_autopm_get_interface(dev->intf);
1131 if (status < 0)
1132 goto fail_halt;
1133 status = usb_clear_halt (dev->udev, dev->in);
1134 usb_autopm_put_interface(dev->intf);
1135 if (status < 0 &&
1136 status != -EPIPE &&
1137 status != -ESHUTDOWN) {
1138 if (netif_msg_rx_err (dev))
1139 fail_halt:
1140 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1141 status);
1142 } else {
1143 clear_bit (EVENT_RX_HALT, &dev->flags);
1144 tasklet_schedule (&dev->bh);
1145 }
1146 }
1147
1148 /* tasklet could resubmit itself forever if memory is tight */
1149 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1150 struct urb *urb = NULL;
1151 int resched = 1;
1152
1153 if (netif_running (dev->net))
1154 urb = usb_alloc_urb (0, GFP_KERNEL);
1155 else
1156 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1157 if (urb != NULL) {
1158 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1159 status = usb_autopm_get_interface(dev->intf);
1160 if (status < 0) {
1161 usb_free_urb(urb);
1162 goto fail_lowmem;
1163 }
1164 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1165 resched = 0;
1166 usb_autopm_put_interface(dev->intf);
1167 fail_lowmem:
1168 if (resched)
1169 tasklet_schedule (&dev->bh);
1170 }
1171 }
1172
1173 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1174 struct driver_info *info = dev->driver_info;
1175 int retval = 0;
1176
1177 clear_bit (EVENT_LINK_RESET, &dev->flags);
1178 status = usb_autopm_get_interface(dev->intf);
1179 if (status < 0)
1180 goto skip_reset;
1181 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1182 usb_autopm_put_interface(dev->intf);
1183 skip_reset:
1184 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1185 retval,
1186 dev->udev->bus->bus_name,
1187 dev->udev->devpath,
1188 info->description);
1189 } else {
1190 usb_autopm_put_interface(dev->intf);
1191 }
1192
1193 /* handle link change from link resetting */
1194 __handle_link_change(dev);
1195 }
1196
1197 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1198 __handle_link_change(dev);
1199
1200 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1201 __handle_set_rx_mode(dev);
1202
1203
1204 if (dev->flags)
1205 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1206 }
1207
1208 /*-------------------------------------------------------------------------*/
1209
1210 static void tx_complete (struct urb *urb)
1211 {
1212 struct sk_buff *skb = (struct sk_buff *) urb->context;
1213 struct skb_data *entry = (struct skb_data *) skb->cb;
1214 struct usbnet *dev = entry->dev;
1215
1216 if (urb->status == 0) {
1217 dev->net->stats.tx_packets += entry->packets;
1218 dev->net->stats.tx_bytes += entry->length;
1219 } else {
1220 dev->net->stats.tx_errors++;
1221
1222 switch (urb->status) {
1223 case -EPIPE:
1224 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1225 break;
1226
1227 /* software-driven interface shutdown */
1228 case -ECONNRESET: // async unlink
1229 case -ESHUTDOWN: // hardware gone
1230 break;
1231
1232 /* like rx, tx gets controller i/o faults during hub_wq
1233 * delays and so it uses the same throttling mechanism.
1234 */
1235 case -EPROTO:
1236 case -ETIME:
1237 case -EILSEQ:
1238 usb_mark_last_busy(dev->udev);
1239 if (!timer_pending (&dev->delay)) {
1240 mod_timer (&dev->delay,
1241 jiffies + THROTTLE_JIFFIES);
1242 netif_dbg(dev, link, dev->net,
1243 "tx throttle %d\n", urb->status);
1244 }
1245 netif_stop_queue (dev->net);
1246 break;
1247 default:
1248 netif_dbg(dev, tx_err, dev->net,
1249 "tx err %d\n", entry->urb->status);
1250 break;
1251 }
1252 }
1253
1254 usb_autopm_put_interface_async(dev->intf);
1255 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1256 }
1257
1258 /*-------------------------------------------------------------------------*/
1259
1260 void usbnet_tx_timeout (struct net_device *net)
1261 {
1262 struct usbnet *dev = netdev_priv(net);
1263
1264 unlink_urbs (dev, &dev->txq);
1265 tasklet_schedule (&dev->bh);
1266 /* this needs to be handled individually because the generic layer
1267 * doesn't know what is sufficient and could not restore private
1268 * information if a remedy of an unconditional reset were used.
1269 */
1270 if (dev->driver_info->recover)
1271 (dev->driver_info->recover)(dev);
1272 }
1273 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1274
1275 /*-------------------------------------------------------------------------*/
1276
1277 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1278 {
1279 unsigned num_sgs, total_len = 0;
1280 int i, s = 0;
1281
1282 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1283 if (num_sgs == 1)
1284 return 0;
1285
1286 /* reserve one for zero packet */
1287 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1288 GFP_ATOMIC);
1289 if (!urb->sg)
1290 return -ENOMEM;
1291
1292 urb->num_sgs = num_sgs;
1293 sg_init_table(urb->sg, urb->num_sgs + 1);
1294
1295 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1296 total_len += skb_headlen(skb);
1297
1298 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1299 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1300
1301 total_len += skb_frag_size(f);
1302 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1303 f->page_offset);
1304 }
1305 urb->transfer_buffer_length = total_len;
1306
1307 return 1;
1308 }
1309
1310 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1311 struct net_device *net)
1312 {
1313 struct usbnet *dev = netdev_priv(net);
1314 unsigned int length;
1315 struct urb *urb = NULL;
1316 struct skb_data *entry;
1317 struct driver_info *info = dev->driver_info;
1318 unsigned long flags;
1319 int retval;
1320
1321 if (skb)
1322 skb_tx_timestamp(skb);
1323
1324 // some devices want funky USB-level framing, for
1325 // win32 driver (usually) and/or hardware quirks
1326 if (info->tx_fixup) {
1327 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1328 if (!skb) {
1329 /* packet collected; minidriver waiting for more */
1330 if (info->flags & FLAG_MULTI_PACKET)
1331 goto not_drop;
1332 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1333 goto drop;
1334 }
1335 }
1336
1337 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1338 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1339 goto drop;
1340 }
1341
1342 entry = (struct skb_data *) skb->cb;
1343 entry->urb = urb;
1344 entry->dev = dev;
1345
1346 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1347 skb->data, skb->len, tx_complete, skb);
1348 if (dev->can_dma_sg) {
1349 if (build_dma_sg(skb, urb) < 0)
1350 goto drop;
1351 }
1352 length = urb->transfer_buffer_length;
1353
1354 /* don't assume the hardware handles USB_ZERO_PACKET
1355 * NOTE: strictly conforming cdc-ether devices should expect
1356 * the ZLP here, but ignore the one-byte packet.
1357 * NOTE2: CDC NCM specification is different from CDC ECM when
1358 * handling ZLP/short packets, so cdc_ncm driver will make short
1359 * packet itself if needed.
1360 */
1361 if (length % dev->maxpacket == 0) {
1362 if (!(info->flags & FLAG_SEND_ZLP)) {
1363 if (!(info->flags & FLAG_MULTI_PACKET)) {
1364 length++;
1365 if (skb_tailroom(skb) && !urb->num_sgs) {
1366 skb->data[skb->len] = 0;
1367 __skb_put(skb, 1);
1368 } else if (urb->num_sgs)
1369 sg_set_buf(&urb->sg[urb->num_sgs++],
1370 dev->padding_pkt, 1);
1371 }
1372 } else
1373 urb->transfer_flags |= URB_ZERO_PACKET;
1374 }
1375 urb->transfer_buffer_length = length;
1376
1377 if (info->flags & FLAG_MULTI_PACKET) {
1378 /* Driver has set number of packets and a length delta.
1379 * Calculate the complete length and ensure that it's
1380 * positive.
1381 */
1382 entry->length += length;
1383 if (WARN_ON_ONCE(entry->length <= 0))
1384 entry->length = length;
1385 } else {
1386 usbnet_set_skb_tx_stats(skb, 1, length);
1387 }
1388
1389 spin_lock_irqsave(&dev->txq.lock, flags);
1390 retval = usb_autopm_get_interface_async(dev->intf);
1391 if (retval < 0) {
1392 spin_unlock_irqrestore(&dev->txq.lock, flags);
1393 goto drop;
1394 }
1395
1396 #ifdef CONFIG_PM
1397 /* if this triggers the device is still a sleep */
1398 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1399 /* transmission will be done in resume */
1400 usb_anchor_urb(urb, &dev->deferred);
1401 /* no use to process more packets */
1402 netif_stop_queue(net);
1403 usb_put_urb(urb);
1404 spin_unlock_irqrestore(&dev->txq.lock, flags);
1405 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1406 goto deferred;
1407 }
1408 #endif
1409
1410 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1411 case -EPIPE:
1412 netif_stop_queue (net);
1413 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1414 usb_autopm_put_interface_async(dev->intf);
1415 break;
1416 default:
1417 usb_autopm_put_interface_async(dev->intf);
1418 netif_dbg(dev, tx_err, dev->net,
1419 "tx: submit urb err %d\n", retval);
1420 break;
1421 case 0:
1422 netif_trans_update(net);
1423 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1424 if (dev->txq.qlen >= TX_QLEN (dev))
1425 netif_stop_queue (net);
1426 }
1427 spin_unlock_irqrestore (&dev->txq.lock, flags);
1428
1429 if (retval) {
1430 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1431 drop:
1432 dev->net->stats.tx_dropped++;
1433 not_drop:
1434 if (skb)
1435 dev_kfree_skb_any (skb);
1436 if (urb) {
1437 kfree(urb->sg);
1438 usb_free_urb(urb);
1439 }
1440 } else
1441 netif_dbg(dev, tx_queued, dev->net,
1442 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1443 #ifdef CONFIG_PM
1444 deferred:
1445 #endif
1446 return NETDEV_TX_OK;
1447 }
1448 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1449
1450 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1451 {
1452 struct urb *urb;
1453 int i;
1454 int ret = 0;
1455
1456 /* don't refill the queue all at once */
1457 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1458 urb = usb_alloc_urb(0, flags);
1459 if (urb != NULL) {
1460 ret = rx_submit(dev, urb, flags);
1461 if (ret)
1462 goto err;
1463 } else {
1464 ret = -ENOMEM;
1465 goto err;
1466 }
1467 }
1468 err:
1469 return ret;
1470 }
1471
1472 /*-------------------------------------------------------------------------*/
1473
1474 // tasklet (work deferred from completions, in_irq) or timer
1475
1476 static void usbnet_bh (unsigned long param)
1477 {
1478 struct usbnet *dev = (struct usbnet *) param;
1479 struct sk_buff *skb;
1480 struct skb_data *entry;
1481
1482 while ((skb = skb_dequeue (&dev->done))) {
1483 entry = (struct skb_data *) skb->cb;
1484 switch (entry->state) {
1485 case rx_done:
1486 entry->state = rx_cleanup;
1487 rx_process (dev, skb);
1488 continue;
1489 case tx_done:
1490 kfree(entry->urb->sg);
1491 case rx_cleanup:
1492 usb_free_urb (entry->urb);
1493 dev_kfree_skb (skb);
1494 continue;
1495 default:
1496 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1497 }
1498 }
1499
1500 /* restart RX again after disabling due to high error rate */
1501 clear_bit(EVENT_RX_KILL, &dev->flags);
1502
1503 /* waiting for all pending urbs to complete?
1504 * only then can we forgo submitting anew
1505 */
1506 if (waitqueue_active(&dev->wait)) {
1507 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1508 wake_up_all(&dev->wait);
1509
1510 // or are we maybe short a few urbs?
1511 } else if (netif_running (dev->net) &&
1512 netif_device_present (dev->net) &&
1513 netif_carrier_ok(dev->net) &&
1514 !timer_pending(&dev->delay) &&
1515 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1516 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1517 int temp = dev->rxq.qlen;
1518
1519 if (temp < RX_QLEN(dev)) {
1520 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1521 return;
1522 if (temp != dev->rxq.qlen)
1523 netif_dbg(dev, link, dev->net,
1524 "rxqlen %d --> %d\n",
1525 temp, dev->rxq.qlen);
1526 if (dev->rxq.qlen < RX_QLEN(dev))
1527 tasklet_schedule (&dev->bh);
1528 }
1529 if (dev->txq.qlen < TX_QLEN (dev))
1530 netif_wake_queue (dev->net);
1531 }
1532 }
1533
1534
1535 /*-------------------------------------------------------------------------
1536 *
1537 * USB Device Driver support
1538 *
1539 *-------------------------------------------------------------------------*/
1540
1541 // precondition: never called in_interrupt
1542
1543 void usbnet_disconnect (struct usb_interface *intf)
1544 {
1545 struct usbnet *dev;
1546 struct usb_device *xdev;
1547 struct net_device *net;
1548
1549 dev = usb_get_intfdata(intf);
1550 usb_set_intfdata(intf, NULL);
1551 if (!dev)
1552 return;
1553
1554 xdev = interface_to_usbdev (intf);
1555
1556 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1557 intf->dev.driver->name,
1558 xdev->bus->bus_name, xdev->devpath,
1559 dev->driver_info->description);
1560
1561 net = dev->net;
1562 unregister_netdev (net);
1563
1564 cancel_work_sync(&dev->kevent);
1565
1566 usb_scuttle_anchored_urbs(&dev->deferred);
1567
1568 if (dev->driver_info->unbind)
1569 dev->driver_info->unbind (dev, intf);
1570
1571 usb_kill_urb(dev->interrupt);
1572 usb_free_urb(dev->interrupt);
1573 kfree(dev->padding_pkt);
1574
1575 free_netdev(net);
1576 }
1577 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1578
1579 static const struct net_device_ops usbnet_netdev_ops = {
1580 .ndo_open = usbnet_open,
1581 .ndo_stop = usbnet_stop,
1582 .ndo_start_xmit = usbnet_start_xmit,
1583 .ndo_tx_timeout = usbnet_tx_timeout,
1584 .ndo_set_rx_mode = usbnet_set_rx_mode,
1585 .ndo_change_mtu = usbnet_change_mtu,
1586 .ndo_set_mac_address = eth_mac_addr,
1587 .ndo_validate_addr = eth_validate_addr,
1588 };
1589
1590 /*-------------------------------------------------------------------------*/
1591
1592 // precondition: never called in_interrupt
1593
1594 static struct device_type wlan_type = {
1595 .name = "wlan",
1596 };
1597
1598 static struct device_type wwan_type = {
1599 .name = "wwan",
1600 };
1601
1602 int
1603 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1604 {
1605 struct usbnet *dev;
1606 struct net_device *net;
1607 struct usb_host_interface *interface;
1608 struct driver_info *info;
1609 struct usb_device *xdev;
1610 int status;
1611 const char *name;
1612 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1613
1614 /* usbnet already took usb runtime pm, so have to enable the feature
1615 * for usb interface, otherwise usb_autopm_get_interface may return
1616 * failure if RUNTIME_PM is enabled.
1617 */
1618 if (!driver->supports_autosuspend) {
1619 driver->supports_autosuspend = 1;
1620 pm_runtime_enable(&udev->dev);
1621 }
1622
1623 name = udev->dev.driver->name;
1624 info = (struct driver_info *) prod->driver_info;
1625 if (!info) {
1626 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1627 return -ENODEV;
1628 }
1629 xdev = interface_to_usbdev (udev);
1630 interface = udev->cur_altsetting;
1631
1632 status = -ENOMEM;
1633
1634 // set up our own records
1635 net = alloc_etherdev(sizeof(*dev));
1636 if (!net)
1637 goto out;
1638
1639 /* netdev_printk() needs this so do it as early as possible */
1640 SET_NETDEV_DEV(net, &udev->dev);
1641
1642 dev = netdev_priv(net);
1643 dev->udev = xdev;
1644 dev->intf = udev;
1645 dev->driver_info = info;
1646 dev->driver_name = name;
1647 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1648 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1649 init_waitqueue_head(&dev->wait);
1650 skb_queue_head_init (&dev->rxq);
1651 skb_queue_head_init (&dev->txq);
1652 skb_queue_head_init (&dev->done);
1653 skb_queue_head_init(&dev->rxq_pause);
1654 dev->bh.func = usbnet_bh;
1655 dev->bh.data = (unsigned long) dev;
1656 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1657 init_usb_anchor(&dev->deferred);
1658 dev->delay.function = usbnet_bh;
1659 dev->delay.data = (unsigned long) dev;
1660 init_timer (&dev->delay);
1661 mutex_init (&dev->phy_mutex);
1662 mutex_init(&dev->interrupt_mutex);
1663 dev->interrupt_count = 0;
1664
1665 dev->net = net;
1666 strcpy (net->name, "usb%d");
1667 memcpy (net->dev_addr, node_id, sizeof node_id);
1668
1669 /* rx and tx sides can use different message sizes;
1670 * bind() should set rx_urb_size in that case.
1671 */
1672 dev->hard_mtu = net->mtu + net->hard_header_len;
1673
1674 net->netdev_ops = &usbnet_netdev_ops;
1675 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1676 net->ethtool_ops = &usbnet_ethtool_ops;
1677
1678 // allow device-specific bind/init procedures
1679 // NOTE net->name still not usable ...
1680 if (info->bind) {
1681 status = info->bind (dev, udev);
1682 if (status < 0)
1683 goto out1;
1684
1685 // heuristic: "usb%d" for links we know are two-host,
1686 // else "eth%d" when there's reasonable doubt. userspace
1687 // can rename the link if it knows better.
1688 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1689 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1690 (net->dev_addr [0] & 0x02) == 0))
1691 strcpy (net->name, "eth%d");
1692 /* WLAN devices should always be named "wlan%d" */
1693 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1694 strcpy(net->name, "wlan%d");
1695 /* WWAN devices should always be named "wwan%d" */
1696 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1697 strcpy(net->name, "wwan%d");
1698
1699 /* devices that cannot do ARP */
1700 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1701 net->flags |= IFF_NOARP;
1702
1703 /* maybe the remote can't receive an Ethernet MTU */
1704 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1705 net->mtu = dev->hard_mtu - net->hard_header_len;
1706 } else if (!info->in || !info->out)
1707 status = usbnet_get_endpoints (dev, udev);
1708 else {
1709 dev->in = usb_rcvbulkpipe (xdev, info->in);
1710 dev->out = usb_sndbulkpipe (xdev, info->out);
1711 if (!(info->flags & FLAG_NO_SETINT))
1712 status = usb_set_interface (xdev,
1713 interface->desc.bInterfaceNumber,
1714 interface->desc.bAlternateSetting);
1715 else
1716 status = 0;
1717
1718 }
1719 if (status >= 0 && dev->status)
1720 status = init_status (dev, udev);
1721 if (status < 0)
1722 goto out3;
1723
1724 if (!dev->rx_urb_size)
1725 dev->rx_urb_size = dev->hard_mtu;
1726 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1727
1728 /* let userspace know we have a random address */
1729 if (ether_addr_equal(net->dev_addr, node_id))
1730 net->addr_assign_type = NET_ADDR_RANDOM;
1731
1732 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1733 SET_NETDEV_DEVTYPE(net, &wlan_type);
1734 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1735 SET_NETDEV_DEVTYPE(net, &wwan_type);
1736
1737 /* initialize max rx_qlen and tx_qlen */
1738 usbnet_update_max_qlen(dev);
1739
1740 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1741 !(info->flags & FLAG_MULTI_PACKET)) {
1742 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1743 if (!dev->padding_pkt) {
1744 status = -ENOMEM;
1745 goto out4;
1746 }
1747 }
1748
1749 status = register_netdev (net);
1750 if (status)
1751 goto out5;
1752 netif_info(dev, probe, dev->net,
1753 "register '%s' at usb-%s-%s, %s, %pM\n",
1754 udev->dev.driver->name,
1755 xdev->bus->bus_name, xdev->devpath,
1756 dev->driver_info->description,
1757 net->dev_addr);
1758
1759 // ok, it's ready to go.
1760 usb_set_intfdata (udev, dev);
1761
1762 netif_device_attach (net);
1763
1764 if (dev->driver_info->flags & FLAG_LINK_INTR)
1765 usbnet_link_change(dev, 0, 0);
1766
1767 return 0;
1768
1769 out5:
1770 kfree(dev->padding_pkt);
1771 out4:
1772 usb_free_urb(dev->interrupt);
1773 out3:
1774 if (info->unbind)
1775 info->unbind (dev, udev);
1776 out1:
1777 /* subdrivers must undo all they did in bind() if they
1778 * fail it, but we may fail later and a deferred kevent
1779 * may trigger an error resubmitting itself and, worse,
1780 * schedule a timer. So we kill it all just in case.
1781 */
1782 cancel_work_sync(&dev->kevent);
1783 del_timer_sync(&dev->delay);
1784 free_netdev(net);
1785 out:
1786 return status;
1787 }
1788 EXPORT_SYMBOL_GPL(usbnet_probe);
1789
1790 /*-------------------------------------------------------------------------*/
1791
1792 /*
1793 * suspend the whole driver as soon as the first interface is suspended
1794 * resume only when the last interface is resumed
1795 */
1796
1797 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1798 {
1799 struct usbnet *dev = usb_get_intfdata(intf);
1800
1801 if (!dev->suspend_count++) {
1802 spin_lock_irq(&dev->txq.lock);
1803 /* don't autosuspend while transmitting */
1804 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1805 dev->suspend_count--;
1806 spin_unlock_irq(&dev->txq.lock);
1807 return -EBUSY;
1808 } else {
1809 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1810 spin_unlock_irq(&dev->txq.lock);
1811 }
1812 /*
1813 * accelerate emptying of the rx and queues, to avoid
1814 * having everything error out.
1815 */
1816 netif_device_detach (dev->net);
1817 usbnet_terminate_urbs(dev);
1818 __usbnet_status_stop_force(dev);
1819
1820 /*
1821 * reattach so runtime management can use and
1822 * wake the device
1823 */
1824 netif_device_attach (dev->net);
1825 }
1826 return 0;
1827 }
1828 EXPORT_SYMBOL_GPL(usbnet_suspend);
1829
1830 int usbnet_resume (struct usb_interface *intf)
1831 {
1832 struct usbnet *dev = usb_get_intfdata(intf);
1833 struct sk_buff *skb;
1834 struct urb *res;
1835 int retval;
1836
1837 if (!--dev->suspend_count) {
1838 /* resume interrupt URB if it was previously submitted */
1839 __usbnet_status_start_force(dev, GFP_NOIO);
1840
1841 spin_lock_irq(&dev->txq.lock);
1842 while ((res = usb_get_from_anchor(&dev->deferred))) {
1843
1844 skb = (struct sk_buff *)res->context;
1845 retval = usb_submit_urb(res, GFP_ATOMIC);
1846 if (retval < 0) {
1847 dev_kfree_skb_any(skb);
1848 kfree(res->sg);
1849 usb_free_urb(res);
1850 usb_autopm_put_interface_async(dev->intf);
1851 } else {
1852 netif_trans_update(dev->net);
1853 __skb_queue_tail(&dev->txq, skb);
1854 }
1855 }
1856
1857 smp_mb();
1858 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1859 spin_unlock_irq(&dev->txq.lock);
1860
1861 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1862 /* handle remote wakeup ASAP
1863 * we cannot race against stop
1864 */
1865 if (netif_device_present(dev->net) &&
1866 !timer_pending(&dev->delay) &&
1867 !test_bit(EVENT_RX_HALT, &dev->flags))
1868 rx_alloc_submit(dev, GFP_NOIO);
1869
1870 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1871 netif_tx_wake_all_queues(dev->net);
1872 tasklet_schedule (&dev->bh);
1873 }
1874 }
1875
1876 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1877 usb_autopm_get_interface_no_resume(intf);
1878
1879 return 0;
1880 }
1881 EXPORT_SYMBOL_GPL(usbnet_resume);
1882
1883 /*
1884 * Either a subdriver implements manage_power, then it is assumed to always
1885 * be ready to be suspended or it reports the readiness to be suspended
1886 * explicitly
1887 */
1888 void usbnet_device_suggests_idle(struct usbnet *dev)
1889 {
1890 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1891 dev->intf->needs_remote_wakeup = 1;
1892 usb_autopm_put_interface_async(dev->intf);
1893 }
1894 }
1895 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1896
1897 /*
1898 * For devices that can do without special commands
1899 */
1900 int usbnet_manage_power(struct usbnet *dev, int on)
1901 {
1902 dev->intf->needs_remote_wakeup = on;
1903 return 0;
1904 }
1905 EXPORT_SYMBOL(usbnet_manage_power);
1906
1907 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1908 {
1909 /* update link after link is reseted */
1910 if (link && !need_reset)
1911 netif_carrier_on(dev->net);
1912 else
1913 netif_carrier_off(dev->net);
1914
1915 if (need_reset && link)
1916 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1917 else
1918 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1919 }
1920 EXPORT_SYMBOL(usbnet_link_change);
1921
1922 /*-------------------------------------------------------------------------*/
1923 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1924 u16 value, u16 index, void *data, u16 size)
1925 {
1926 void *buf = NULL;
1927 int err = -ENOMEM;
1928
1929 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1930 " value=0x%04x index=0x%04x size=%d\n",
1931 cmd, reqtype, value, index, size);
1932
1933 if (data) {
1934 buf = kmalloc(size, GFP_KERNEL);
1935 if (!buf)
1936 goto out;
1937 }
1938
1939 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1940 cmd, reqtype, value, index, buf, size,
1941 USB_CTRL_GET_TIMEOUT);
1942 if (err > 0 && err <= size)
1943 memcpy(data, buf, err);
1944 kfree(buf);
1945 out:
1946 return err;
1947 }
1948
1949 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1950 u16 value, u16 index, const void *data,
1951 u16 size)
1952 {
1953 void *buf = NULL;
1954 int err = -ENOMEM;
1955
1956 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1957 " value=0x%04x index=0x%04x size=%d\n",
1958 cmd, reqtype, value, index, size);
1959
1960 if (data) {
1961 buf = kmemdup(data, size, GFP_KERNEL);
1962 if (!buf)
1963 goto out;
1964 }
1965
1966 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1967 cmd, reqtype, value, index, buf, size,
1968 USB_CTRL_SET_TIMEOUT);
1969 kfree(buf);
1970
1971 out:
1972 return err;
1973 }
1974
1975 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
1976 struct usb_interface *intf,
1977 u8 *buffer,
1978 int buflen)
1979 {
1980 /* duplicates are ignored */
1981 struct usb_cdc_union_desc *union_header = NULL;
1982
1983 /* duplicates are not tolerated */
1984 struct usb_cdc_header_desc *header = NULL;
1985 struct usb_cdc_ether_desc *ether = NULL;
1986 struct usb_cdc_mdlm_detail_desc *detail = NULL;
1987 struct usb_cdc_mdlm_desc *desc = NULL;
1988
1989 unsigned int elength;
1990 int cnt = 0;
1991
1992 memset(hdr, 0x00, sizeof(struct usb_cdc_parsed_header));
1993 hdr->phonet_magic_present = false;
1994 while (buflen > 0) {
1995 elength = buffer[0];
1996 if (!elength) {
1997 dev_err(&intf->dev, "skipping garbage byte\n");
1998 elength = 1;
1999 goto next_desc;
2000 }
2001 if (buffer[1] != USB_DT_CS_INTERFACE) {
2002 dev_err(&intf->dev, "skipping garbage\n");
2003 goto next_desc;
2004 }
2005
2006 switch (buffer[2]) {
2007 case USB_CDC_UNION_TYPE: /* we've found it */
2008 if (elength < sizeof(struct usb_cdc_union_desc))
2009 goto next_desc;
2010 if (union_header) {
2011 dev_err(&intf->dev, "More than one union descriptor, skipping ...\n");
2012 goto next_desc;
2013 }
2014 union_header = (struct usb_cdc_union_desc *)buffer;
2015 break;
2016 case USB_CDC_COUNTRY_TYPE:
2017 if (elength < sizeof(struct usb_cdc_country_functional_desc))
2018 goto next_desc;
2019 hdr->usb_cdc_country_functional_desc =
2020 (struct usb_cdc_country_functional_desc *)buffer;
2021 break;
2022 case USB_CDC_HEADER_TYPE:
2023 if (elength != sizeof(struct usb_cdc_header_desc))
2024 goto next_desc;
2025 if (header)
2026 return -EINVAL;
2027 header = (struct usb_cdc_header_desc *)buffer;
2028 break;
2029 case USB_CDC_ACM_TYPE:
2030 if (elength < sizeof(struct usb_cdc_acm_descriptor))
2031 goto next_desc;
2032 hdr->usb_cdc_acm_descriptor =
2033 (struct usb_cdc_acm_descriptor *)buffer;
2034 break;
2035 case USB_CDC_ETHERNET_TYPE:
2036 if (elength != sizeof(struct usb_cdc_ether_desc))
2037 goto next_desc;
2038 if (ether)
2039 return -EINVAL;
2040 ether = (struct usb_cdc_ether_desc *)buffer;
2041 break;
2042 case USB_CDC_CALL_MANAGEMENT_TYPE:
2043 if (elength < sizeof(struct usb_cdc_call_mgmt_descriptor))
2044 goto next_desc;
2045 hdr->usb_cdc_call_mgmt_descriptor =
2046 (struct usb_cdc_call_mgmt_descriptor *)buffer;
2047 break;
2048 case USB_CDC_DMM_TYPE:
2049 if (elength < sizeof(struct usb_cdc_dmm_desc))
2050 goto next_desc;
2051 hdr->usb_cdc_dmm_desc =
2052 (struct usb_cdc_dmm_desc *)buffer;
2053 break;
2054 case USB_CDC_MDLM_TYPE:
2055 if (elength < sizeof(struct usb_cdc_mdlm_desc *))
2056 goto next_desc;
2057 if (desc)
2058 return -EINVAL;
2059 desc = (struct usb_cdc_mdlm_desc *)buffer;
2060 break;
2061 case USB_CDC_MDLM_DETAIL_TYPE:
2062 if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *))
2063 goto next_desc;
2064 if (detail)
2065 return -EINVAL;
2066 detail = (struct usb_cdc_mdlm_detail_desc *)buffer;
2067 break;
2068 case USB_CDC_NCM_TYPE:
2069 if (elength < sizeof(struct usb_cdc_ncm_desc))
2070 goto next_desc;
2071 hdr->usb_cdc_ncm_desc = (struct usb_cdc_ncm_desc *)buffer;
2072 break;
2073 case USB_CDC_MBIM_TYPE:
2074 if (elength < sizeof(struct usb_cdc_mbim_desc))
2075 goto next_desc;
2076
2077 hdr->usb_cdc_mbim_desc = (struct usb_cdc_mbim_desc *)buffer;
2078 break;
2079 case USB_CDC_MBIM_EXTENDED_TYPE:
2080 if (elength < sizeof(struct usb_cdc_mbim_extended_desc))
2081 break;
2082 hdr->usb_cdc_mbim_extended_desc =
2083 (struct usb_cdc_mbim_extended_desc *)buffer;
2084 break;
2085 case CDC_PHONET_MAGIC_NUMBER:
2086 hdr->phonet_magic_present = true;
2087 break;
2088 default:
2089 /*
2090 * there are LOTS more CDC descriptors that
2091 * could legitimately be found here.
2092 */
2093 dev_dbg(&intf->dev, "Ignoring descriptor: type %02x, length %ud\n",
2094 buffer[2], elength);
2095 goto next_desc;
2096 }
2097 cnt++;
2098 next_desc:
2099 buflen -= elength;
2100 buffer += elength;
2101 }
2102 hdr->usb_cdc_union_desc = union_header;
2103 hdr->usb_cdc_header_desc = header;
2104 hdr->usb_cdc_mdlm_detail_desc = detail;
2105 hdr->usb_cdc_mdlm_desc = desc;
2106 hdr->usb_cdc_ether_desc = ether;
2107 return cnt;
2108 }
2109
2110 EXPORT_SYMBOL(cdc_parse_cdc_header);
2111
2112 /*
2113 * The function can't be called inside suspend/resume callback,
2114 * otherwise deadlock will be caused.
2115 */
2116 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2117 u16 value, u16 index, void *data, u16 size)
2118 {
2119 int ret;
2120
2121 if (usb_autopm_get_interface(dev->intf) < 0)
2122 return -ENODEV;
2123 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2124 data, size);
2125 usb_autopm_put_interface(dev->intf);
2126 return ret;
2127 }
2128 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2129
2130 /*
2131 * The function can't be called inside suspend/resume callback,
2132 * otherwise deadlock will be caused.
2133 */
2134 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2135 u16 value, u16 index, const void *data, u16 size)
2136 {
2137 int ret;
2138
2139 if (usb_autopm_get_interface(dev->intf) < 0)
2140 return -ENODEV;
2141 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2142 data, size);
2143 usb_autopm_put_interface(dev->intf);
2144 return ret;
2145 }
2146 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2147
2148 /*
2149 * The function can be called inside suspend/resume callback safely
2150 * and should only be called by suspend/resume callback generally.
2151 */
2152 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2153 u16 value, u16 index, void *data, u16 size)
2154 {
2155 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2156 data, size);
2157 }
2158 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2159
2160 /*
2161 * The function can be called inside suspend/resume callback safely
2162 * and should only be called by suspend/resume callback generally.
2163 */
2164 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2165 u16 value, u16 index, const void *data,
2166 u16 size)
2167 {
2168 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2169 data, size);
2170 }
2171 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2172
2173 static void usbnet_async_cmd_cb(struct urb *urb)
2174 {
2175 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2176 int status = urb->status;
2177
2178 if (status < 0)
2179 dev_dbg(&urb->dev->dev, "%s failed with %d",
2180 __func__, status);
2181
2182 kfree(req);
2183 usb_free_urb(urb);
2184 }
2185
2186 /*
2187 * The caller must make sure that device can't be put into suspend
2188 * state until the control URB completes.
2189 */
2190 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2191 u16 value, u16 index, const void *data, u16 size)
2192 {
2193 struct usb_ctrlrequest *req = NULL;
2194 struct urb *urb;
2195 int err = -ENOMEM;
2196 void *buf = NULL;
2197
2198 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2199 " value=0x%04x index=0x%04x size=%d\n",
2200 cmd, reqtype, value, index, size);
2201
2202 urb = usb_alloc_urb(0, GFP_ATOMIC);
2203 if (!urb) {
2204 netdev_err(dev->net, "Error allocating URB in"
2205 " %s!\n", __func__);
2206 goto fail;
2207 }
2208
2209 if (data) {
2210 buf = kmemdup(data, size, GFP_ATOMIC);
2211 if (!buf) {
2212 netdev_err(dev->net, "Error allocating buffer"
2213 " in %s!\n", __func__);
2214 goto fail_free;
2215 }
2216 }
2217
2218 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2219 if (!req)
2220 goto fail_free_buf;
2221
2222 req->bRequestType = reqtype;
2223 req->bRequest = cmd;
2224 req->wValue = cpu_to_le16(value);
2225 req->wIndex = cpu_to_le16(index);
2226 req->wLength = cpu_to_le16(size);
2227
2228 usb_fill_control_urb(urb, dev->udev,
2229 usb_sndctrlpipe(dev->udev, 0),
2230 (void *)req, buf, size,
2231 usbnet_async_cmd_cb, req);
2232 urb->transfer_flags |= URB_FREE_BUFFER;
2233
2234 err = usb_submit_urb(urb, GFP_ATOMIC);
2235 if (err < 0) {
2236 netdev_err(dev->net, "Error submitting the control"
2237 " message: status=%d\n", err);
2238 goto fail_free;
2239 }
2240 return 0;
2241
2242 fail_free_buf:
2243 kfree(buf);
2244 fail_free:
2245 kfree(req);
2246 usb_free_urb(urb);
2247 fail:
2248 return err;
2249
2250 }
2251 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2252 /*-------------------------------------------------------------------------*/
2253
2254 static int __init usbnet_init(void)
2255 {
2256 /* Compiler should optimize this out. */
2257 BUILD_BUG_ON(
2258 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2259
2260 eth_random_addr(node_id);
2261 return 0;
2262 }
2263 module_init(usbnet_init);
2264
2265 static void __exit usbnet_exit(void)
2266 {
2267 }
2268 module_exit(usbnet_exit);
2269
2270 MODULE_AUTHOR("David Brownell");
2271 MODULE_DESCRIPTION("USB network driver framework");
2272 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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