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ASoC: nau8825: drop redundant idiom when converting integer to boolean
[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_unlink_rx_urbs(dev);
400 }
401
402 /* max qlen depend on hard_mtu and rx_urb_size */
403 usbnet_update_max_qlen(dev);
404
405 return 0;
406 }
407 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
408
409 /* The caller must hold list->lock */
410 static void __usbnet_queue_skb(struct sk_buff_head *list,
411 struct sk_buff *newsk, enum skb_state state)
412 {
413 struct skb_data *entry = (struct skb_data *) newsk->cb;
414
415 __skb_queue_tail(list, newsk);
416 entry->state = state;
417 }
418
419 /*-------------------------------------------------------------------------*/
420
421 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
422 * completion callbacks. 2.5 should have fixed those bugs...
423 */
424
425 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
426 struct sk_buff_head *list, enum skb_state state)
427 {
428 unsigned long flags;
429 enum skb_state old_state;
430 struct skb_data *entry = (struct skb_data *) skb->cb;
431
432 spin_lock_irqsave(&list->lock, flags);
433 old_state = entry->state;
434 entry->state = state;
435 __skb_unlink(skb, list);
436
437 /* defer_bh() is never called with list == &dev->done.
438 * spin_lock_nested() tells lockdep that it is OK to take
439 * dev->done.lock here with list->lock held.
440 */
441 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
442
443 __skb_queue_tail(&dev->done, skb);
444 if (dev->done.qlen == 1)
445 tasklet_schedule(&dev->bh);
446 spin_unlock(&dev->done.lock);
447 spin_unlock_irqrestore(&list->lock, flags);
448 return old_state;
449 }
450
451 /* some work can't be done in tasklets, so we use keventd
452 *
453 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
454 * but tasklet_schedule() doesn't. hope the failure is rare.
455 */
456 void usbnet_defer_kevent (struct usbnet *dev, int work)
457 {
458 set_bit (work, &dev->flags);
459 if (!schedule_work (&dev->kevent)) {
460 if (net_ratelimit())
461 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
462 } else {
463 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
464 }
465 }
466 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
467
468 /*-------------------------------------------------------------------------*/
469
470 static void rx_complete (struct urb *urb);
471
472 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
473 {
474 struct sk_buff *skb;
475 struct skb_data *entry;
476 int retval = 0;
477 unsigned long lockflags;
478 size_t size = dev->rx_urb_size;
479
480 /* prevent rx skb allocation when error ratio is high */
481 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
482 usb_free_urb(urb);
483 return -ENOLINK;
484 }
485
486 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
487 if (!skb) {
488 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
489 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
490 usb_free_urb (urb);
491 return -ENOMEM;
492 }
493
494 entry = (struct skb_data *) skb->cb;
495 entry->urb = urb;
496 entry->dev = dev;
497 entry->length = 0;
498
499 usb_fill_bulk_urb (urb, dev->udev, dev->in,
500 skb->data, size, rx_complete, skb);
501
502 spin_lock_irqsave (&dev->rxq.lock, lockflags);
503
504 if (netif_running (dev->net) &&
505 netif_device_present (dev->net) &&
506 !test_bit (EVENT_RX_HALT, &dev->flags) &&
507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
509 case -EPIPE:
510 usbnet_defer_kevent (dev, EVENT_RX_HALT);
511 break;
512 case -ENOMEM:
513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
514 break;
515 case -ENODEV:
516 netif_dbg(dev, ifdown, dev->net, "device gone\n");
517 netif_device_detach (dev->net);
518 break;
519 case -EHOSTUNREACH:
520 retval = -ENOLINK;
521 break;
522 default:
523 netif_dbg(dev, rx_err, dev->net,
524 "rx submit, %d\n", retval);
525 tasklet_schedule (&dev->bh);
526 break;
527 case 0:
528 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
529 }
530 } else {
531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
532 retval = -ENOLINK;
533 }
534 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
535 if (retval) {
536 dev_kfree_skb_any (skb);
537 usb_free_urb (urb);
538 }
539 return retval;
540 }
541
542
543 /*-------------------------------------------------------------------------*/
544
545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
546 {
547 if (dev->driver_info->rx_fixup &&
548 !dev->driver_info->rx_fixup (dev, skb)) {
549 /* With RX_ASSEMBLE, rx_fixup() must update counters */
550 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
551 dev->net->stats.rx_errors++;
552 goto done;
553 }
554 // else network stack removes extra byte if we forced a short packet
555
556 /* all data was already cloned from skb inside the driver */
557 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
558 goto done;
559
560 if (skb->len < ETH_HLEN) {
561 dev->net->stats.rx_errors++;
562 dev->net->stats.rx_length_errors++;
563 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
564 } else {
565 usbnet_skb_return(dev, skb);
566 return;
567 }
568
569 done:
570 skb_queue_tail(&dev->done, skb);
571 }
572
573 /*-------------------------------------------------------------------------*/
574
575 static void rx_complete (struct urb *urb)
576 {
577 struct sk_buff *skb = (struct sk_buff *) urb->context;
578 struct skb_data *entry = (struct skb_data *) skb->cb;
579 struct usbnet *dev = entry->dev;
580 int urb_status = urb->status;
581 enum skb_state state;
582
583 skb_put (skb, urb->actual_length);
584 state = rx_done;
585 entry->urb = NULL;
586
587 switch (urb_status) {
588 /* success */
589 case 0:
590 break;
591
592 /* stalls need manual reset. this is rare ... except that
593 * when going through USB 2.0 TTs, unplug appears this way.
594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
595 * storm, recovering as needed.
596 */
597 case -EPIPE:
598 dev->net->stats.rx_errors++;
599 usbnet_defer_kevent (dev, EVENT_RX_HALT);
600 // FALLTHROUGH
601
602 /* software-driven interface shutdown */
603 case -ECONNRESET: /* async unlink */
604 case -ESHUTDOWN: /* hardware gone */
605 netif_dbg(dev, ifdown, dev->net,
606 "rx shutdown, code %d\n", urb_status);
607 goto block;
608
609 /* we get controller i/o faults during hub_wq disconnect() delays.
610 * throttle down resubmits, to avoid log floods; just temporarily,
611 * so we still recover when the fault isn't a hub_wq delay.
612 */
613 case -EPROTO:
614 case -ETIME:
615 case -EILSEQ:
616 dev->net->stats.rx_errors++;
617 if (!timer_pending (&dev->delay)) {
618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
619 netif_dbg(dev, link, dev->net,
620 "rx throttle %d\n", urb_status);
621 }
622 block:
623 state = rx_cleanup;
624 entry->urb = urb;
625 urb = NULL;
626 break;
627
628 /* data overrun ... flush fifo? */
629 case -EOVERFLOW:
630 dev->net->stats.rx_over_errors++;
631 // FALLTHROUGH
632
633 default:
634 state = rx_cleanup;
635 dev->net->stats.rx_errors++;
636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
637 break;
638 }
639
640 /* stop rx if packet error rate is high */
641 if (++dev->pkt_cnt > 30) {
642 dev->pkt_cnt = 0;
643 dev->pkt_err = 0;
644 } else {
645 if (state == rx_cleanup)
646 dev->pkt_err++;
647 if (dev->pkt_err > 20)
648 set_bit(EVENT_RX_KILL, &dev->flags);
649 }
650
651 state = defer_bh(dev, skb, &dev->rxq, state);
652
653 if (urb) {
654 if (netif_running (dev->net) &&
655 !test_bit (EVENT_RX_HALT, &dev->flags) &&
656 state != unlink_start) {
657 rx_submit (dev, urb, GFP_ATOMIC);
658 usb_mark_last_busy(dev->udev);
659 return;
660 }
661 usb_free_urb (urb);
662 }
663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
664 }
665
666 /*-------------------------------------------------------------------------*/
667 void usbnet_pause_rx(struct usbnet *dev)
668 {
669 set_bit(EVENT_RX_PAUSED, &dev->flags);
670
671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
672 }
673 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
674
675 void usbnet_resume_rx(struct usbnet *dev)
676 {
677 struct sk_buff *skb;
678 int num = 0;
679
680 clear_bit(EVENT_RX_PAUSED, &dev->flags);
681
682 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
683 usbnet_skb_return(dev, skb);
684 num++;
685 }
686
687 tasklet_schedule(&dev->bh);
688
689 netif_dbg(dev, rx_status, dev->net,
690 "paused rx queue disabled, %d skbs requeued\n", num);
691 }
692 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
693
694 void usbnet_purge_paused_rxq(struct usbnet *dev)
695 {
696 skb_queue_purge(&dev->rxq_pause);
697 }
698 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
699
700 /*-------------------------------------------------------------------------*/
701
702 // unlink pending rx/tx; completion handlers do all other cleanup
703
704 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
705 {
706 unsigned long flags;
707 struct sk_buff *skb;
708 int count = 0;
709
710 spin_lock_irqsave (&q->lock, flags);
711 while (!skb_queue_empty(q)) {
712 struct skb_data *entry;
713 struct urb *urb;
714 int retval;
715
716 skb_queue_walk(q, skb) {
717 entry = (struct skb_data *) skb->cb;
718 if (entry->state != unlink_start)
719 goto found;
720 }
721 break;
722 found:
723 entry->state = unlink_start;
724 urb = entry->urb;
725
726 /*
727 * Get reference count of the URB to avoid it to be
728 * freed during usb_unlink_urb, which may trigger
729 * use-after-free problem inside usb_unlink_urb since
730 * usb_unlink_urb is always racing with .complete
731 * handler(include defer_bh).
732 */
733 usb_get_urb(urb);
734 spin_unlock_irqrestore(&q->lock, flags);
735 // during some PM-driven resume scenarios,
736 // these (async) unlinks complete immediately
737 retval = usb_unlink_urb (urb);
738 if (retval != -EINPROGRESS && retval != 0)
739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
740 else
741 count++;
742 usb_put_urb(urb);
743 spin_lock_irqsave(&q->lock, flags);
744 }
745 spin_unlock_irqrestore (&q->lock, flags);
746 return count;
747 }
748
749 // Flush all pending rx urbs
750 // minidrivers may need to do this when the MTU changes
751
752 void usbnet_unlink_rx_urbs(struct usbnet *dev)
753 {
754 if (netif_running(dev->net)) {
755 (void) unlink_urbs (dev, &dev->rxq);
756 tasklet_schedule(&dev->bh);
757 }
758 }
759 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
760
761 /*-------------------------------------------------------------------------*/
762
763 static void wait_skb_queue_empty(struct sk_buff_head *q)
764 {
765 unsigned long flags;
766
767 spin_lock_irqsave(&q->lock, flags);
768 while (!skb_queue_empty(q)) {
769 spin_unlock_irqrestore(&q->lock, flags);
770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
771 set_current_state(TASK_UNINTERRUPTIBLE);
772 spin_lock_irqsave(&q->lock, flags);
773 }
774 spin_unlock_irqrestore(&q->lock, flags);
775 }
776
777 // precondition: never called in_interrupt
778 static void usbnet_terminate_urbs(struct usbnet *dev)
779 {
780 DECLARE_WAITQUEUE(wait, current);
781 int temp;
782
783 /* ensure there are no more active urbs */
784 add_wait_queue(&dev->wait, &wait);
785 set_current_state(TASK_UNINTERRUPTIBLE);
786 temp = unlink_urbs(dev, &dev->txq) +
787 unlink_urbs(dev, &dev->rxq);
788
789 /* maybe wait for deletions to finish. */
790 wait_skb_queue_empty(&dev->rxq);
791 wait_skb_queue_empty(&dev->txq);
792 wait_skb_queue_empty(&dev->done);
793 netif_dbg(dev, ifdown, dev->net,
794 "waited for %d urb completions\n", temp);
795 set_current_state(TASK_RUNNING);
796 remove_wait_queue(&dev->wait, &wait);
797 }
798
799 int usbnet_stop (struct net_device *net)
800 {
801 struct usbnet *dev = netdev_priv(net);
802 struct driver_info *info = dev->driver_info;
803 int retval, pm, mpn;
804
805 clear_bit(EVENT_DEV_OPEN, &dev->flags);
806 netif_stop_queue (net);
807
808 netif_info(dev, ifdown, dev->net,
809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
810 net->stats.rx_packets, net->stats.tx_packets,
811 net->stats.rx_errors, net->stats.tx_errors);
812
813 /* to not race resume */
814 pm = usb_autopm_get_interface(dev->intf);
815 /* allow minidriver to stop correctly (wireless devices to turn off
816 * radio etc) */
817 if (info->stop) {
818 retval = info->stop(dev);
819 if (retval < 0)
820 netif_info(dev, ifdown, dev->net,
821 "stop fail (%d) usbnet usb-%s-%s, %s\n",
822 retval,
823 dev->udev->bus->bus_name, dev->udev->devpath,
824 info->description);
825 }
826
827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
828 usbnet_terminate_urbs(dev);
829
830 usbnet_status_stop(dev);
831
832 usbnet_purge_paused_rxq(dev);
833
834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
835
836 /* deferred work (task, timer, softirq) must also stop.
837 * can't flush_scheduled_work() until we drop rtnl (later),
838 * else workers could deadlock; so make workers a NOP.
839 */
840 dev->flags = 0;
841 del_timer_sync (&dev->delay);
842 tasklet_kill (&dev->bh);
843 if (!pm)
844 usb_autopm_put_interface(dev->intf);
845
846 if (info->manage_power && mpn)
847 info->manage_power(dev, 0);
848 else
849 usb_autopm_put_interface(dev->intf);
850
851 return 0;
852 }
853 EXPORT_SYMBOL_GPL(usbnet_stop);
854
855 /*-------------------------------------------------------------------------*/
856
857 // posts reads, and enables write queuing
858
859 // precondition: never called in_interrupt
860
861 int usbnet_open (struct net_device *net)
862 {
863 struct usbnet *dev = netdev_priv(net);
864 int retval;
865 struct driver_info *info = dev->driver_info;
866
867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
868 netif_info(dev, ifup, dev->net,
869 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
870 retval,
871 dev->udev->bus->bus_name,
872 dev->udev->devpath,
873 info->description);
874 goto done_nopm;
875 }
876
877 // put into "known safe" state
878 if (info->reset && (retval = info->reset (dev)) < 0) {
879 netif_info(dev, ifup, dev->net,
880 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
881 retval,
882 dev->udev->bus->bus_name,
883 dev->udev->devpath,
884 info->description);
885 goto done;
886 }
887
888 /* hard_mtu or rx_urb_size may change in reset() */
889 usbnet_update_max_qlen(dev);
890
891 // insist peer be connected
892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
894 goto done;
895 }
896
897 /* start any status interrupt transfer */
898 if (dev->interrupt) {
899 retval = usbnet_status_start(dev, GFP_KERNEL);
900 if (retval < 0) {
901 netif_err(dev, ifup, dev->net,
902 "intr submit %d\n", retval);
903 goto done;
904 }
905 }
906
907 set_bit(EVENT_DEV_OPEN, &dev->flags);
908 netif_start_queue (net);
909 netif_info(dev, ifup, dev->net,
910 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
911 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
912 dev->net->mtu,
913 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
914 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
915 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
916 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
917 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
918 "simple");
919
920 /* reset rx error state */
921 dev->pkt_cnt = 0;
922 dev->pkt_err = 0;
923 clear_bit(EVENT_RX_KILL, &dev->flags);
924
925 // delay posting reads until we're fully open
926 tasklet_schedule (&dev->bh);
927 if (info->manage_power) {
928 retval = info->manage_power(dev, 1);
929 if (retval < 0) {
930 retval = 0;
931 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
932 } else {
933 usb_autopm_put_interface(dev->intf);
934 }
935 }
936 return retval;
937 done:
938 usb_autopm_put_interface(dev->intf);
939 done_nopm:
940 return retval;
941 }
942 EXPORT_SYMBOL_GPL(usbnet_open);
943
944 /*-------------------------------------------------------------------------*/
945
946 /* ethtool methods; minidrivers may need to add some more, but
947 * they'll probably want to use this base set.
948 */
949
950 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
951 {
952 struct usbnet *dev = netdev_priv(net);
953
954 if (!dev->mii.mdio_read)
955 return -EOPNOTSUPP;
956
957 return mii_ethtool_gset(&dev->mii, cmd);
958 }
959 EXPORT_SYMBOL_GPL(usbnet_get_settings);
960
961 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
962 {
963 struct usbnet *dev = netdev_priv(net);
964 int retval;
965
966 if (!dev->mii.mdio_write)
967 return -EOPNOTSUPP;
968
969 retval = mii_ethtool_sset(&dev->mii, cmd);
970
971 /* link speed/duplex might have changed */
972 if (dev->driver_info->link_reset)
973 dev->driver_info->link_reset(dev);
974
975 /* hard_mtu or rx_urb_size may change in link_reset() */
976 usbnet_update_max_qlen(dev);
977
978 return retval;
979
980 }
981 EXPORT_SYMBOL_GPL(usbnet_set_settings);
982
983 u32 usbnet_get_link (struct net_device *net)
984 {
985 struct usbnet *dev = netdev_priv(net);
986
987 /* If a check_connect is defined, return its result */
988 if (dev->driver_info->check_connect)
989 return dev->driver_info->check_connect (dev) == 0;
990
991 /* if the device has mii operations, use those */
992 if (dev->mii.mdio_read)
993 return mii_link_ok(&dev->mii);
994
995 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
996 return ethtool_op_get_link(net);
997 }
998 EXPORT_SYMBOL_GPL(usbnet_get_link);
999
1000 int usbnet_nway_reset(struct net_device *net)
1001 {
1002 struct usbnet *dev = netdev_priv(net);
1003
1004 if (!dev->mii.mdio_write)
1005 return -EOPNOTSUPP;
1006
1007 return mii_nway_restart(&dev->mii);
1008 }
1009 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1010
1011 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1012 {
1013 struct usbnet *dev = netdev_priv(net);
1014
1015 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1016 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1017 strlcpy (info->fw_version, dev->driver_info->description,
1018 sizeof info->fw_version);
1019 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1020 }
1021 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1022
1023 u32 usbnet_get_msglevel (struct net_device *net)
1024 {
1025 struct usbnet *dev = netdev_priv(net);
1026
1027 return dev->msg_enable;
1028 }
1029 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1030
1031 void usbnet_set_msglevel (struct net_device *net, u32 level)
1032 {
1033 struct usbnet *dev = netdev_priv(net);
1034
1035 dev->msg_enable = level;
1036 }
1037 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1038
1039 /* drivers may override default ethtool_ops in their bind() routine */
1040 static const struct ethtool_ops usbnet_ethtool_ops = {
1041 .get_settings = usbnet_get_settings,
1042 .set_settings = usbnet_set_settings,
1043 .get_link = usbnet_get_link,
1044 .nway_reset = usbnet_nway_reset,
1045 .get_drvinfo = usbnet_get_drvinfo,
1046 .get_msglevel = usbnet_get_msglevel,
1047 .set_msglevel = usbnet_set_msglevel,
1048 .get_ts_info = ethtool_op_get_ts_info,
1049 };
1050
1051 /*-------------------------------------------------------------------------*/
1052
1053 static void __handle_link_change(struct usbnet *dev)
1054 {
1055 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1056 return;
1057
1058 if (!netif_carrier_ok(dev->net)) {
1059 /* kill URBs for reading packets to save bus bandwidth */
1060 unlink_urbs(dev, &dev->rxq);
1061
1062 /*
1063 * tx_timeout will unlink URBs for sending packets and
1064 * tx queue is stopped by netcore after link becomes off
1065 */
1066 } else {
1067 /* submitting URBs for reading packets */
1068 tasklet_schedule(&dev->bh);
1069 }
1070
1071 /* hard_mtu or rx_urb_size may change during link change */
1072 usbnet_update_max_qlen(dev);
1073
1074 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1075 }
1076
1077 static void usbnet_set_rx_mode(struct net_device *net)
1078 {
1079 struct usbnet *dev = netdev_priv(net);
1080
1081 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1082 }
1083
1084 static void __handle_set_rx_mode(struct usbnet *dev)
1085 {
1086 if (dev->driver_info->set_rx_mode)
1087 (dev->driver_info->set_rx_mode)(dev);
1088
1089 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1090 }
1091
1092 /* work that cannot be done in interrupt context uses keventd.
1093 *
1094 * NOTE: with 2.5 we could do more of this using completion callbacks,
1095 * especially now that control transfers can be queued.
1096 */
1097 static void
1098 usbnet_deferred_kevent (struct work_struct *work)
1099 {
1100 struct usbnet *dev =
1101 container_of(work, struct usbnet, kevent);
1102 int status;
1103
1104 /* usb_clear_halt() needs a thread context */
1105 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1106 unlink_urbs (dev, &dev->txq);
1107 status = usb_autopm_get_interface(dev->intf);
1108 if (status < 0)
1109 goto fail_pipe;
1110 status = usb_clear_halt (dev->udev, dev->out);
1111 usb_autopm_put_interface(dev->intf);
1112 if (status < 0 &&
1113 status != -EPIPE &&
1114 status != -ESHUTDOWN) {
1115 if (netif_msg_tx_err (dev))
1116 fail_pipe:
1117 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1118 status);
1119 } else {
1120 clear_bit (EVENT_TX_HALT, &dev->flags);
1121 if (status != -ESHUTDOWN)
1122 netif_wake_queue (dev->net);
1123 }
1124 }
1125 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1126 unlink_urbs (dev, &dev->rxq);
1127 status = usb_autopm_get_interface(dev->intf);
1128 if (status < 0)
1129 goto fail_halt;
1130 status = usb_clear_halt (dev->udev, dev->in);
1131 usb_autopm_put_interface(dev->intf);
1132 if (status < 0 &&
1133 status != -EPIPE &&
1134 status != -ESHUTDOWN) {
1135 if (netif_msg_rx_err (dev))
1136 fail_halt:
1137 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1138 status);
1139 } else {
1140 clear_bit (EVENT_RX_HALT, &dev->flags);
1141 tasklet_schedule (&dev->bh);
1142 }
1143 }
1144
1145 /* tasklet could resubmit itself forever if memory is tight */
1146 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1147 struct urb *urb = NULL;
1148 int resched = 1;
1149
1150 if (netif_running (dev->net))
1151 urb = usb_alloc_urb (0, GFP_KERNEL);
1152 else
1153 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1154 if (urb != NULL) {
1155 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1156 status = usb_autopm_get_interface(dev->intf);
1157 if (status < 0) {
1158 usb_free_urb(urb);
1159 goto fail_lowmem;
1160 }
1161 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1162 resched = 0;
1163 usb_autopm_put_interface(dev->intf);
1164 fail_lowmem:
1165 if (resched)
1166 tasklet_schedule (&dev->bh);
1167 }
1168 }
1169
1170 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1171 struct driver_info *info = dev->driver_info;
1172 int retval = 0;
1173
1174 clear_bit (EVENT_LINK_RESET, &dev->flags);
1175 status = usb_autopm_get_interface(dev->intf);
1176 if (status < 0)
1177 goto skip_reset;
1178 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1179 usb_autopm_put_interface(dev->intf);
1180 skip_reset:
1181 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1182 retval,
1183 dev->udev->bus->bus_name,
1184 dev->udev->devpath,
1185 info->description);
1186 } else {
1187 usb_autopm_put_interface(dev->intf);
1188 }
1189
1190 /* handle link change from link resetting */
1191 __handle_link_change(dev);
1192 }
1193
1194 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1195 __handle_link_change(dev);
1196
1197 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1198 __handle_set_rx_mode(dev);
1199
1200
1201 if (dev->flags)
1202 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1203 }
1204
1205 /*-------------------------------------------------------------------------*/
1206
1207 static void tx_complete (struct urb *urb)
1208 {
1209 struct sk_buff *skb = (struct sk_buff *) urb->context;
1210 struct skb_data *entry = (struct skb_data *) skb->cb;
1211 struct usbnet *dev = entry->dev;
1212
1213 if (urb->status == 0) {
1214 dev->net->stats.tx_packets += entry->packets;
1215 dev->net->stats.tx_bytes += entry->length;
1216 } else {
1217 dev->net->stats.tx_errors++;
1218
1219 switch (urb->status) {
1220 case -EPIPE:
1221 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1222 break;
1223
1224 /* software-driven interface shutdown */
1225 case -ECONNRESET: // async unlink
1226 case -ESHUTDOWN: // hardware gone
1227 break;
1228
1229 /* like rx, tx gets controller i/o faults during hub_wq
1230 * delays and so it uses the same throttling mechanism.
1231 */
1232 case -EPROTO:
1233 case -ETIME:
1234 case -EILSEQ:
1235 usb_mark_last_busy(dev->udev);
1236 if (!timer_pending (&dev->delay)) {
1237 mod_timer (&dev->delay,
1238 jiffies + THROTTLE_JIFFIES);
1239 netif_dbg(dev, link, dev->net,
1240 "tx throttle %d\n", urb->status);
1241 }
1242 netif_stop_queue (dev->net);
1243 break;
1244 default:
1245 netif_dbg(dev, tx_err, dev->net,
1246 "tx err %d\n", entry->urb->status);
1247 break;
1248 }
1249 }
1250
1251 usb_autopm_put_interface_async(dev->intf);
1252 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1253 }
1254
1255 /*-------------------------------------------------------------------------*/
1256
1257 void usbnet_tx_timeout (struct net_device *net)
1258 {
1259 struct usbnet *dev = netdev_priv(net);
1260
1261 unlink_urbs (dev, &dev->txq);
1262 tasklet_schedule (&dev->bh);
1263 /* this needs to be handled individually because the generic layer
1264 * doesn't know what is sufficient and could not restore private
1265 * information if a remedy of an unconditional reset were used.
1266 */
1267 if (dev->driver_info->recover)
1268 (dev->driver_info->recover)(dev);
1269 }
1270 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1271
1272 /*-------------------------------------------------------------------------*/
1273
1274 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1275 {
1276 unsigned num_sgs, total_len = 0;
1277 int i, s = 0;
1278
1279 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1280 if (num_sgs == 1)
1281 return 0;
1282
1283 /* reserve one for zero packet */
1284 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1285 GFP_ATOMIC);
1286 if (!urb->sg)
1287 return -ENOMEM;
1288
1289 urb->num_sgs = num_sgs;
1290 sg_init_table(urb->sg, urb->num_sgs + 1);
1291
1292 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1293 total_len += skb_headlen(skb);
1294
1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1296 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1297
1298 total_len += skb_frag_size(f);
1299 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1300 f->page_offset);
1301 }
1302 urb->transfer_buffer_length = total_len;
1303
1304 return 1;
1305 }
1306
1307 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1308 struct net_device *net)
1309 {
1310 struct usbnet *dev = netdev_priv(net);
1311 unsigned int length;
1312 struct urb *urb = NULL;
1313 struct skb_data *entry;
1314 struct driver_info *info = dev->driver_info;
1315 unsigned long flags;
1316 int retval;
1317
1318 if (skb)
1319 skb_tx_timestamp(skb);
1320
1321 // some devices want funky USB-level framing, for
1322 // win32 driver (usually) and/or hardware quirks
1323 if (info->tx_fixup) {
1324 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1325 if (!skb) {
1326 /* packet collected; minidriver waiting for more */
1327 if (info->flags & FLAG_MULTI_PACKET)
1328 goto not_drop;
1329 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1330 goto drop;
1331 }
1332 }
1333
1334 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1335 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1336 goto drop;
1337 }
1338
1339 entry = (struct skb_data *) skb->cb;
1340 entry->urb = urb;
1341 entry->dev = dev;
1342
1343 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1344 skb->data, skb->len, tx_complete, skb);
1345 if (dev->can_dma_sg) {
1346 if (build_dma_sg(skb, urb) < 0)
1347 goto drop;
1348 }
1349 length = urb->transfer_buffer_length;
1350
1351 /* don't assume the hardware handles USB_ZERO_PACKET
1352 * NOTE: strictly conforming cdc-ether devices should expect
1353 * the ZLP here, but ignore the one-byte packet.
1354 * NOTE2: CDC NCM specification is different from CDC ECM when
1355 * handling ZLP/short packets, so cdc_ncm driver will make short
1356 * packet itself if needed.
1357 */
1358 if (length % dev->maxpacket == 0) {
1359 if (!(info->flags & FLAG_SEND_ZLP)) {
1360 if (!(info->flags & FLAG_MULTI_PACKET)) {
1361 length++;
1362 if (skb_tailroom(skb) && !urb->num_sgs) {
1363 skb->data[skb->len] = 0;
1364 __skb_put(skb, 1);
1365 } else if (urb->num_sgs)
1366 sg_set_buf(&urb->sg[urb->num_sgs++],
1367 dev->padding_pkt, 1);
1368 }
1369 } else
1370 urb->transfer_flags |= URB_ZERO_PACKET;
1371 }
1372 urb->transfer_buffer_length = length;
1373
1374 if (info->flags & FLAG_MULTI_PACKET) {
1375 /* Driver has set number of packets and a length delta.
1376 * Calculate the complete length and ensure that it's
1377 * positive.
1378 */
1379 entry->length += length;
1380 if (WARN_ON_ONCE(entry->length <= 0))
1381 entry->length = length;
1382 } else {
1383 usbnet_set_skb_tx_stats(skb, 1, length);
1384 }
1385
1386 spin_lock_irqsave(&dev->txq.lock, flags);
1387 retval = usb_autopm_get_interface_async(dev->intf);
1388 if (retval < 0) {
1389 spin_unlock_irqrestore(&dev->txq.lock, flags);
1390 goto drop;
1391 }
1392
1393 #ifdef CONFIG_PM
1394 /* if this triggers the device is still a sleep */
1395 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1396 /* transmission will be done in resume */
1397 usb_anchor_urb(urb, &dev->deferred);
1398 /* no use to process more packets */
1399 netif_stop_queue(net);
1400 usb_put_urb(urb);
1401 spin_unlock_irqrestore(&dev->txq.lock, flags);
1402 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1403 goto deferred;
1404 }
1405 #endif
1406
1407 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1408 case -EPIPE:
1409 netif_stop_queue (net);
1410 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1411 usb_autopm_put_interface_async(dev->intf);
1412 break;
1413 default:
1414 usb_autopm_put_interface_async(dev->intf);
1415 netif_dbg(dev, tx_err, dev->net,
1416 "tx: submit urb err %d\n", retval);
1417 break;
1418 case 0:
1419 netif_trans_update(net);
1420 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1421 if (dev->txq.qlen >= TX_QLEN (dev))
1422 netif_stop_queue (net);
1423 }
1424 spin_unlock_irqrestore (&dev->txq.lock, flags);
1425
1426 if (retval) {
1427 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1428 drop:
1429 dev->net->stats.tx_dropped++;
1430 not_drop:
1431 if (skb)
1432 dev_kfree_skb_any (skb);
1433 if (urb) {
1434 kfree(urb->sg);
1435 usb_free_urb(urb);
1436 }
1437 } else
1438 netif_dbg(dev, tx_queued, dev->net,
1439 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1440 #ifdef CONFIG_PM
1441 deferred:
1442 #endif
1443 return NETDEV_TX_OK;
1444 }
1445 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1446
1447 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1448 {
1449 struct urb *urb;
1450 int i;
1451 int ret = 0;
1452
1453 /* don't refill the queue all at once */
1454 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1455 urb = usb_alloc_urb(0, flags);
1456 if (urb != NULL) {
1457 ret = rx_submit(dev, urb, flags);
1458 if (ret)
1459 goto err;
1460 } else {
1461 ret = -ENOMEM;
1462 goto err;
1463 }
1464 }
1465 err:
1466 return ret;
1467 }
1468
1469 /*-------------------------------------------------------------------------*/
1470
1471 // tasklet (work deferred from completions, in_irq) or timer
1472
1473 static void usbnet_bh (unsigned long param)
1474 {
1475 struct usbnet *dev = (struct usbnet *) param;
1476 struct sk_buff *skb;
1477 struct skb_data *entry;
1478
1479 while ((skb = skb_dequeue (&dev->done))) {
1480 entry = (struct skb_data *) skb->cb;
1481 switch (entry->state) {
1482 case rx_done:
1483 entry->state = rx_cleanup;
1484 rx_process (dev, skb);
1485 continue;
1486 case tx_done:
1487 kfree(entry->urb->sg);
1488 case rx_cleanup:
1489 usb_free_urb (entry->urb);
1490 dev_kfree_skb (skb);
1491 continue;
1492 default:
1493 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1494 }
1495 }
1496
1497 /* restart RX again after disabling due to high error rate */
1498 clear_bit(EVENT_RX_KILL, &dev->flags);
1499
1500 /* waiting for all pending urbs to complete?
1501 * only then can we forgo submitting anew
1502 */
1503 if (waitqueue_active(&dev->wait)) {
1504 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1505 wake_up_all(&dev->wait);
1506
1507 // or are we maybe short a few urbs?
1508 } else if (netif_running (dev->net) &&
1509 netif_device_present (dev->net) &&
1510 netif_carrier_ok(dev->net) &&
1511 !timer_pending (&dev->delay) &&
1512 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1513 int temp = dev->rxq.qlen;
1514
1515 if (temp < RX_QLEN(dev)) {
1516 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1517 return;
1518 if (temp != dev->rxq.qlen)
1519 netif_dbg(dev, link, dev->net,
1520 "rxqlen %d --> %d\n",
1521 temp, dev->rxq.qlen);
1522 if (dev->rxq.qlen < RX_QLEN(dev))
1523 tasklet_schedule (&dev->bh);
1524 }
1525 if (dev->txq.qlen < TX_QLEN (dev))
1526 netif_wake_queue (dev->net);
1527 }
1528 }
1529
1530
1531 /*-------------------------------------------------------------------------
1532 *
1533 * USB Device Driver support
1534 *
1535 *-------------------------------------------------------------------------*/
1536
1537 // precondition: never called in_interrupt
1538
1539 void usbnet_disconnect (struct usb_interface *intf)
1540 {
1541 struct usbnet *dev;
1542 struct usb_device *xdev;
1543 struct net_device *net;
1544
1545 dev = usb_get_intfdata(intf);
1546 usb_set_intfdata(intf, NULL);
1547 if (!dev)
1548 return;
1549
1550 xdev = interface_to_usbdev (intf);
1551
1552 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1553 intf->dev.driver->name,
1554 xdev->bus->bus_name, xdev->devpath,
1555 dev->driver_info->description);
1556
1557 net = dev->net;
1558 unregister_netdev (net);
1559
1560 cancel_work_sync(&dev->kevent);
1561
1562 usb_scuttle_anchored_urbs(&dev->deferred);
1563
1564 if (dev->driver_info->unbind)
1565 dev->driver_info->unbind (dev, intf);
1566
1567 usb_kill_urb(dev->interrupt);
1568 usb_free_urb(dev->interrupt);
1569 kfree(dev->padding_pkt);
1570
1571 free_netdev(net);
1572 }
1573 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1574
1575 static const struct net_device_ops usbnet_netdev_ops = {
1576 .ndo_open = usbnet_open,
1577 .ndo_stop = usbnet_stop,
1578 .ndo_start_xmit = usbnet_start_xmit,
1579 .ndo_tx_timeout = usbnet_tx_timeout,
1580 .ndo_set_rx_mode = usbnet_set_rx_mode,
1581 .ndo_change_mtu = usbnet_change_mtu,
1582 .ndo_set_mac_address = eth_mac_addr,
1583 .ndo_validate_addr = eth_validate_addr,
1584 };
1585
1586 /*-------------------------------------------------------------------------*/
1587
1588 // precondition: never called in_interrupt
1589
1590 static struct device_type wlan_type = {
1591 .name = "wlan",
1592 };
1593
1594 static struct device_type wwan_type = {
1595 .name = "wwan",
1596 };
1597
1598 int
1599 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1600 {
1601 struct usbnet *dev;
1602 struct net_device *net;
1603 struct usb_host_interface *interface;
1604 struct driver_info *info;
1605 struct usb_device *xdev;
1606 int status;
1607 const char *name;
1608 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1609
1610 /* usbnet already took usb runtime pm, so have to enable the feature
1611 * for usb interface, otherwise usb_autopm_get_interface may return
1612 * failure if RUNTIME_PM is enabled.
1613 */
1614 if (!driver->supports_autosuspend) {
1615 driver->supports_autosuspend = 1;
1616 pm_runtime_enable(&udev->dev);
1617 }
1618
1619 name = udev->dev.driver->name;
1620 info = (struct driver_info *) prod->driver_info;
1621 if (!info) {
1622 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1623 return -ENODEV;
1624 }
1625 xdev = interface_to_usbdev (udev);
1626 interface = udev->cur_altsetting;
1627
1628 status = -ENOMEM;
1629
1630 // set up our own records
1631 net = alloc_etherdev(sizeof(*dev));
1632 if (!net)
1633 goto out;
1634
1635 /* netdev_printk() needs this so do it as early as possible */
1636 SET_NETDEV_DEV(net, &udev->dev);
1637
1638 dev = netdev_priv(net);
1639 dev->udev = xdev;
1640 dev->intf = udev;
1641 dev->driver_info = info;
1642 dev->driver_name = name;
1643 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1644 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1645 init_waitqueue_head(&dev->wait);
1646 skb_queue_head_init (&dev->rxq);
1647 skb_queue_head_init (&dev->txq);
1648 skb_queue_head_init (&dev->done);
1649 skb_queue_head_init(&dev->rxq_pause);
1650 dev->bh.func = usbnet_bh;
1651 dev->bh.data = (unsigned long) dev;
1652 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1653 init_usb_anchor(&dev->deferred);
1654 dev->delay.function = usbnet_bh;
1655 dev->delay.data = (unsigned long) dev;
1656 init_timer (&dev->delay);
1657 mutex_init (&dev->phy_mutex);
1658 mutex_init(&dev->interrupt_mutex);
1659 dev->interrupt_count = 0;
1660
1661 dev->net = net;
1662 strcpy (net->name, "usb%d");
1663 memcpy (net->dev_addr, node_id, sizeof node_id);
1664
1665 /* rx and tx sides can use different message sizes;
1666 * bind() should set rx_urb_size in that case.
1667 */
1668 dev->hard_mtu = net->mtu + net->hard_header_len;
1669
1670 net->netdev_ops = &usbnet_netdev_ops;
1671 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1672 net->ethtool_ops = &usbnet_ethtool_ops;
1673
1674 // allow device-specific bind/init procedures
1675 // NOTE net->name still not usable ...
1676 if (info->bind) {
1677 status = info->bind (dev, udev);
1678 if (status < 0)
1679 goto out1;
1680
1681 // heuristic: "usb%d" for links we know are two-host,
1682 // else "eth%d" when there's reasonable doubt. userspace
1683 // can rename the link if it knows better.
1684 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1685 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1686 (net->dev_addr [0] & 0x02) == 0))
1687 strcpy (net->name, "eth%d");
1688 /* WLAN devices should always be named "wlan%d" */
1689 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1690 strcpy(net->name, "wlan%d");
1691 /* WWAN devices should always be named "wwan%d" */
1692 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1693 strcpy(net->name, "wwan%d");
1694
1695 /* devices that cannot do ARP */
1696 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1697 net->flags |= IFF_NOARP;
1698
1699 /* maybe the remote can't receive an Ethernet MTU */
1700 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1701 net->mtu = dev->hard_mtu - net->hard_header_len;
1702 } else if (!info->in || !info->out)
1703 status = usbnet_get_endpoints (dev, udev);
1704 else {
1705 dev->in = usb_rcvbulkpipe (xdev, info->in);
1706 dev->out = usb_sndbulkpipe (xdev, info->out);
1707 if (!(info->flags & FLAG_NO_SETINT))
1708 status = usb_set_interface (xdev,
1709 interface->desc.bInterfaceNumber,
1710 interface->desc.bAlternateSetting);
1711 else
1712 status = 0;
1713
1714 }
1715 if (status >= 0 && dev->status)
1716 status = init_status (dev, udev);
1717 if (status < 0)
1718 goto out3;
1719
1720 if (!dev->rx_urb_size)
1721 dev->rx_urb_size = dev->hard_mtu;
1722 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1723
1724 /* let userspace know we have a random address */
1725 if (ether_addr_equal(net->dev_addr, node_id))
1726 net->addr_assign_type = NET_ADDR_RANDOM;
1727
1728 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1729 SET_NETDEV_DEVTYPE(net, &wlan_type);
1730 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1731 SET_NETDEV_DEVTYPE(net, &wwan_type);
1732
1733 /* initialize max rx_qlen and tx_qlen */
1734 usbnet_update_max_qlen(dev);
1735
1736 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1737 !(info->flags & FLAG_MULTI_PACKET)) {
1738 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1739 if (!dev->padding_pkt) {
1740 status = -ENOMEM;
1741 goto out4;
1742 }
1743 }
1744
1745 status = register_netdev (net);
1746 if (status)
1747 goto out5;
1748 netif_info(dev, probe, dev->net,
1749 "register '%s' at usb-%s-%s, %s, %pM\n",
1750 udev->dev.driver->name,
1751 xdev->bus->bus_name, xdev->devpath,
1752 dev->driver_info->description,
1753 net->dev_addr);
1754
1755 // ok, it's ready to go.
1756 usb_set_intfdata (udev, dev);
1757
1758 netif_device_attach (net);
1759
1760 if (dev->driver_info->flags & FLAG_LINK_INTR)
1761 usbnet_link_change(dev, 0, 0);
1762
1763 return 0;
1764
1765 out5:
1766 kfree(dev->padding_pkt);
1767 out4:
1768 usb_free_urb(dev->interrupt);
1769 out3:
1770 if (info->unbind)
1771 info->unbind (dev, udev);
1772 out1:
1773 /* subdrivers must undo all they did in bind() if they
1774 * fail it, but we may fail later and a deferred kevent
1775 * may trigger an error resubmitting itself and, worse,
1776 * schedule a timer. So we kill it all just in case.
1777 */
1778 cancel_work_sync(&dev->kevent);
1779 del_timer_sync(&dev->delay);
1780 free_netdev(net);
1781 out:
1782 return status;
1783 }
1784 EXPORT_SYMBOL_GPL(usbnet_probe);
1785
1786 /*-------------------------------------------------------------------------*/
1787
1788 /*
1789 * suspend the whole driver as soon as the first interface is suspended
1790 * resume only when the last interface is resumed
1791 */
1792
1793 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1794 {
1795 struct usbnet *dev = usb_get_intfdata(intf);
1796
1797 if (!dev->suspend_count++) {
1798 spin_lock_irq(&dev->txq.lock);
1799 /* don't autosuspend while transmitting */
1800 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1801 dev->suspend_count--;
1802 spin_unlock_irq(&dev->txq.lock);
1803 return -EBUSY;
1804 } else {
1805 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1806 spin_unlock_irq(&dev->txq.lock);
1807 }
1808 /*
1809 * accelerate emptying of the rx and queues, to avoid
1810 * having everything error out.
1811 */
1812 netif_device_detach (dev->net);
1813 usbnet_terminate_urbs(dev);
1814 __usbnet_status_stop_force(dev);
1815
1816 /*
1817 * reattach so runtime management can use and
1818 * wake the device
1819 */
1820 netif_device_attach (dev->net);
1821 }
1822 return 0;
1823 }
1824 EXPORT_SYMBOL_GPL(usbnet_suspend);
1825
1826 int usbnet_resume (struct usb_interface *intf)
1827 {
1828 struct usbnet *dev = usb_get_intfdata(intf);
1829 struct sk_buff *skb;
1830 struct urb *res;
1831 int retval;
1832
1833 if (!--dev->suspend_count) {
1834 /* resume interrupt URB if it was previously submitted */
1835 __usbnet_status_start_force(dev, GFP_NOIO);
1836
1837 spin_lock_irq(&dev->txq.lock);
1838 while ((res = usb_get_from_anchor(&dev->deferred))) {
1839
1840 skb = (struct sk_buff *)res->context;
1841 retval = usb_submit_urb(res, GFP_ATOMIC);
1842 if (retval < 0) {
1843 dev_kfree_skb_any(skb);
1844 kfree(res->sg);
1845 usb_free_urb(res);
1846 usb_autopm_put_interface_async(dev->intf);
1847 } else {
1848 netif_trans_update(dev->net);
1849 __skb_queue_tail(&dev->txq, skb);
1850 }
1851 }
1852
1853 smp_mb();
1854 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1855 spin_unlock_irq(&dev->txq.lock);
1856
1857 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1858 /* handle remote wakeup ASAP
1859 * we cannot race against stop
1860 */
1861 if (netif_device_present(dev->net) &&
1862 !timer_pending(&dev->delay) &&
1863 !test_bit(EVENT_RX_HALT, &dev->flags))
1864 rx_alloc_submit(dev, GFP_NOIO);
1865
1866 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1867 netif_tx_wake_all_queues(dev->net);
1868 tasklet_schedule (&dev->bh);
1869 }
1870 }
1871
1872 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1873 usb_autopm_get_interface_no_resume(intf);
1874
1875 return 0;
1876 }
1877 EXPORT_SYMBOL_GPL(usbnet_resume);
1878
1879 /*
1880 * Either a subdriver implements manage_power, then it is assumed to always
1881 * be ready to be suspended or it reports the readiness to be suspended
1882 * explicitly
1883 */
1884 void usbnet_device_suggests_idle(struct usbnet *dev)
1885 {
1886 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1887 dev->intf->needs_remote_wakeup = 1;
1888 usb_autopm_put_interface_async(dev->intf);
1889 }
1890 }
1891 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1892
1893 /*
1894 * For devices that can do without special commands
1895 */
1896 int usbnet_manage_power(struct usbnet *dev, int on)
1897 {
1898 dev->intf->needs_remote_wakeup = on;
1899 return 0;
1900 }
1901 EXPORT_SYMBOL(usbnet_manage_power);
1902
1903 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1904 {
1905 /* update link after link is reseted */
1906 if (link && !need_reset)
1907 netif_carrier_on(dev->net);
1908 else
1909 netif_carrier_off(dev->net);
1910
1911 if (need_reset && link)
1912 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1913 else
1914 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1915 }
1916 EXPORT_SYMBOL(usbnet_link_change);
1917
1918 /*-------------------------------------------------------------------------*/
1919 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1920 u16 value, u16 index, void *data, u16 size)
1921 {
1922 void *buf = NULL;
1923 int err = -ENOMEM;
1924
1925 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1926 " value=0x%04x index=0x%04x size=%d\n",
1927 cmd, reqtype, value, index, size);
1928
1929 if (data) {
1930 buf = kmalloc(size, GFP_KERNEL);
1931 if (!buf)
1932 goto out;
1933 }
1934
1935 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1936 cmd, reqtype, value, index, buf, size,
1937 USB_CTRL_GET_TIMEOUT);
1938 if (err > 0 && err <= size)
1939 memcpy(data, buf, err);
1940 kfree(buf);
1941 out:
1942 return err;
1943 }
1944
1945 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1946 u16 value, u16 index, const void *data,
1947 u16 size)
1948 {
1949 void *buf = NULL;
1950 int err = -ENOMEM;
1951
1952 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1953 " value=0x%04x index=0x%04x size=%d\n",
1954 cmd, reqtype, value, index, size);
1955
1956 if (data) {
1957 buf = kmemdup(data, size, GFP_KERNEL);
1958 if (!buf)
1959 goto out;
1960 }
1961
1962 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1963 cmd, reqtype, value, index, buf, size,
1964 USB_CTRL_SET_TIMEOUT);
1965 kfree(buf);
1966
1967 out:
1968 return err;
1969 }
1970
1971 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
1972 struct usb_interface *intf,
1973 u8 *buffer,
1974 int buflen)
1975 {
1976 /* duplicates are ignored */
1977 struct usb_cdc_union_desc *union_header = NULL;
1978
1979 /* duplicates are not tolerated */
1980 struct usb_cdc_header_desc *header = NULL;
1981 struct usb_cdc_ether_desc *ether = NULL;
1982 struct usb_cdc_mdlm_detail_desc *detail = NULL;
1983 struct usb_cdc_mdlm_desc *desc = NULL;
1984
1985 unsigned int elength;
1986 int cnt = 0;
1987
1988 memset(hdr, 0x00, sizeof(struct usb_cdc_parsed_header));
1989 hdr->phonet_magic_present = false;
1990 while (buflen > 0) {
1991 elength = buffer[0];
1992 if (!elength) {
1993 dev_err(&intf->dev, "skipping garbage byte\n");
1994 elength = 1;
1995 goto next_desc;
1996 }
1997 if (buffer[1] != USB_DT_CS_INTERFACE) {
1998 dev_err(&intf->dev, "skipping garbage\n");
1999 goto next_desc;
2000 }
2001
2002 switch (buffer[2]) {
2003 case USB_CDC_UNION_TYPE: /* we've found it */
2004 if (elength < sizeof(struct usb_cdc_union_desc))
2005 goto next_desc;
2006 if (union_header) {
2007 dev_err(&intf->dev, "More than one union descriptor, skipping ...\n");
2008 goto next_desc;
2009 }
2010 union_header = (struct usb_cdc_union_desc *)buffer;
2011 break;
2012 case USB_CDC_COUNTRY_TYPE:
2013 if (elength < sizeof(struct usb_cdc_country_functional_desc))
2014 goto next_desc;
2015 hdr->usb_cdc_country_functional_desc =
2016 (struct usb_cdc_country_functional_desc *)buffer;
2017 break;
2018 case USB_CDC_HEADER_TYPE:
2019 if (elength != sizeof(struct usb_cdc_header_desc))
2020 goto next_desc;
2021 if (header)
2022 return -EINVAL;
2023 header = (struct usb_cdc_header_desc *)buffer;
2024 break;
2025 case USB_CDC_ACM_TYPE:
2026 if (elength < sizeof(struct usb_cdc_acm_descriptor))
2027 goto next_desc;
2028 hdr->usb_cdc_acm_descriptor =
2029 (struct usb_cdc_acm_descriptor *)buffer;
2030 break;
2031 case USB_CDC_ETHERNET_TYPE:
2032 if (elength != sizeof(struct usb_cdc_ether_desc))
2033 goto next_desc;
2034 if (ether)
2035 return -EINVAL;
2036 ether = (struct usb_cdc_ether_desc *)buffer;
2037 break;
2038 case USB_CDC_CALL_MANAGEMENT_TYPE:
2039 if (elength < sizeof(struct usb_cdc_call_mgmt_descriptor))
2040 goto next_desc;
2041 hdr->usb_cdc_call_mgmt_descriptor =
2042 (struct usb_cdc_call_mgmt_descriptor *)buffer;
2043 break;
2044 case USB_CDC_DMM_TYPE:
2045 if (elength < sizeof(struct usb_cdc_dmm_desc))
2046 goto next_desc;
2047 hdr->usb_cdc_dmm_desc =
2048 (struct usb_cdc_dmm_desc *)buffer;
2049 break;
2050 case USB_CDC_MDLM_TYPE:
2051 if (elength < sizeof(struct usb_cdc_mdlm_desc *))
2052 goto next_desc;
2053 if (desc)
2054 return -EINVAL;
2055 desc = (struct usb_cdc_mdlm_desc *)buffer;
2056 break;
2057 case USB_CDC_MDLM_DETAIL_TYPE:
2058 if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *))
2059 goto next_desc;
2060 if (detail)
2061 return -EINVAL;
2062 detail = (struct usb_cdc_mdlm_detail_desc *)buffer;
2063 break;
2064 case USB_CDC_NCM_TYPE:
2065 if (elength < sizeof(struct usb_cdc_ncm_desc))
2066 goto next_desc;
2067 hdr->usb_cdc_ncm_desc = (struct usb_cdc_ncm_desc *)buffer;
2068 break;
2069 case USB_CDC_MBIM_TYPE:
2070 if (elength < sizeof(struct usb_cdc_mbim_desc))
2071 goto next_desc;
2072
2073 hdr->usb_cdc_mbim_desc = (struct usb_cdc_mbim_desc *)buffer;
2074 break;
2075 case USB_CDC_MBIM_EXTENDED_TYPE:
2076 if (elength < sizeof(struct usb_cdc_mbim_extended_desc))
2077 break;
2078 hdr->usb_cdc_mbim_extended_desc =
2079 (struct usb_cdc_mbim_extended_desc *)buffer;
2080 break;
2081 case CDC_PHONET_MAGIC_NUMBER:
2082 hdr->phonet_magic_present = true;
2083 break;
2084 default:
2085 /*
2086 * there are LOTS more CDC descriptors that
2087 * could legitimately be found here.
2088 */
2089 dev_dbg(&intf->dev, "Ignoring descriptor: type %02x, length %ud\n",
2090 buffer[2], elength);
2091 goto next_desc;
2092 }
2093 cnt++;
2094 next_desc:
2095 buflen -= elength;
2096 buffer += elength;
2097 }
2098 hdr->usb_cdc_union_desc = union_header;
2099 hdr->usb_cdc_header_desc = header;
2100 hdr->usb_cdc_mdlm_detail_desc = detail;
2101 hdr->usb_cdc_mdlm_desc = desc;
2102 hdr->usb_cdc_ether_desc = ether;
2103 return cnt;
2104 }
2105
2106 EXPORT_SYMBOL(cdc_parse_cdc_header);
2107
2108 /*
2109 * The function can't be called inside suspend/resume callback,
2110 * otherwise deadlock will be caused.
2111 */
2112 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2113 u16 value, u16 index, void *data, u16 size)
2114 {
2115 int ret;
2116
2117 if (usb_autopm_get_interface(dev->intf) < 0)
2118 return -ENODEV;
2119 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2120 data, size);
2121 usb_autopm_put_interface(dev->intf);
2122 return ret;
2123 }
2124 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2125
2126 /*
2127 * The function can't be called inside suspend/resume callback,
2128 * otherwise deadlock will be caused.
2129 */
2130 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2131 u16 value, u16 index, const void *data, u16 size)
2132 {
2133 int ret;
2134
2135 if (usb_autopm_get_interface(dev->intf) < 0)
2136 return -ENODEV;
2137 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2138 data, size);
2139 usb_autopm_put_interface(dev->intf);
2140 return ret;
2141 }
2142 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2143
2144 /*
2145 * The function can be called inside suspend/resume callback safely
2146 * and should only be called by suspend/resume callback generally.
2147 */
2148 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2149 u16 value, u16 index, void *data, u16 size)
2150 {
2151 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2152 data, size);
2153 }
2154 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2155
2156 /*
2157 * The function can be called inside suspend/resume callback safely
2158 * and should only be called by suspend/resume callback generally.
2159 */
2160 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2161 u16 value, u16 index, const void *data,
2162 u16 size)
2163 {
2164 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2165 data, size);
2166 }
2167 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2168
2169 static void usbnet_async_cmd_cb(struct urb *urb)
2170 {
2171 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2172 int status = urb->status;
2173
2174 if (status < 0)
2175 dev_dbg(&urb->dev->dev, "%s failed with %d",
2176 __func__, status);
2177
2178 kfree(req);
2179 usb_free_urb(urb);
2180 }
2181
2182 /*
2183 * The caller must make sure that device can't be put into suspend
2184 * state until the control URB completes.
2185 */
2186 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2187 u16 value, u16 index, const void *data, u16 size)
2188 {
2189 struct usb_ctrlrequest *req = NULL;
2190 struct urb *urb;
2191 int err = -ENOMEM;
2192 void *buf = NULL;
2193
2194 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2195 " value=0x%04x index=0x%04x size=%d\n",
2196 cmd, reqtype, value, index, size);
2197
2198 urb = usb_alloc_urb(0, GFP_ATOMIC);
2199 if (!urb) {
2200 netdev_err(dev->net, "Error allocating URB in"
2201 " %s!\n", __func__);
2202 goto fail;
2203 }
2204
2205 if (data) {
2206 buf = kmemdup(data, size, GFP_ATOMIC);
2207 if (!buf) {
2208 netdev_err(dev->net, "Error allocating buffer"
2209 " in %s!\n", __func__);
2210 goto fail_free;
2211 }
2212 }
2213
2214 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2215 if (!req)
2216 goto fail_free_buf;
2217
2218 req->bRequestType = reqtype;
2219 req->bRequest = cmd;
2220 req->wValue = cpu_to_le16(value);
2221 req->wIndex = cpu_to_le16(index);
2222 req->wLength = cpu_to_le16(size);
2223
2224 usb_fill_control_urb(urb, dev->udev,
2225 usb_sndctrlpipe(dev->udev, 0),
2226 (void *)req, buf, size,
2227 usbnet_async_cmd_cb, req);
2228 urb->transfer_flags |= URB_FREE_BUFFER;
2229
2230 err = usb_submit_urb(urb, GFP_ATOMIC);
2231 if (err < 0) {
2232 netdev_err(dev->net, "Error submitting the control"
2233 " message: status=%d\n", err);
2234 goto fail_free;
2235 }
2236 return 0;
2237
2238 fail_free_buf:
2239 kfree(buf);
2240 fail_free:
2241 kfree(req);
2242 usb_free_urb(urb);
2243 fail:
2244 return err;
2245
2246 }
2247 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2248 /*-------------------------------------------------------------------------*/
2249
2250 static int __init usbnet_init(void)
2251 {
2252 /* Compiler should optimize this out. */
2253 BUILD_BUG_ON(
2254 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2255
2256 eth_random_addr(node_id);
2257 return 0;
2258 }
2259 module_init(usbnet_init);
2260
2261 static void __exit usbnet_exit(void)
2262 {
2263 }
2264 module_exit(usbnet_exit);
2265
2266 MODULE_AUTHOR("David Brownell");
2267 MODULE_DESCRIPTION("USB network driver framework");
2268 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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