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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / net / usb / usbnet.c
blob10798128c03fc64881c5a437df3510f016461b7c
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 /*
360 * Not take default 5ms qlen for super speed HC to
361 * save memory, and iperf tests show 2.5ms qlen can
362 * work well
363 */
364 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
365 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
366 break;
367 default:
368 dev->rx_qlen = dev->tx_qlen = 4;
369 }
370 }
371 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
372
373 \f
374 /*-------------------------------------------------------------------------
375 *
376 * Network Device Driver (peer link to "Host Device", from USB host)
377 *
378 *-------------------------------------------------------------------------*/
379
380 int usbnet_change_mtu (struct net_device *net, int new_mtu)
381 {
382 struct usbnet *dev = netdev_priv(net);
383 int ll_mtu = new_mtu + net->hard_header_len;
384 int old_hard_mtu = dev->hard_mtu;
385 int old_rx_urb_size = dev->rx_urb_size;
386
387 if (new_mtu <= 0)
388 return -EINVAL;
389 // no second zero-length packet read wanted after mtu-sized packets
390 if ((ll_mtu % dev->maxpacket) == 0)
391 return -EDOM;
392 net->mtu = new_mtu;
393
394 dev->hard_mtu = net->mtu + net->hard_header_len;
395 if (dev->rx_urb_size == old_hard_mtu) {
396 dev->rx_urb_size = dev->hard_mtu;
397 if (dev->rx_urb_size > old_rx_urb_size)
398 usbnet_unlink_rx_urbs(dev);
399 }
400
401 /* max qlen depend on hard_mtu and rx_urb_size */
402 usbnet_update_max_qlen(dev);
403
404 return 0;
405 }
406 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
407
408 /* The caller must hold list->lock */
409 static void __usbnet_queue_skb(struct sk_buff_head *list,
410 struct sk_buff *newsk, enum skb_state state)
411 {
412 struct skb_data *entry = (struct skb_data *) newsk->cb;
413
414 __skb_queue_tail(list, newsk);
415 entry->state = state;
416 }
417
418 /*-------------------------------------------------------------------------*/
419
420 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
421 * completion callbacks. 2.5 should have fixed those bugs...
422 */
423
424 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
425 struct sk_buff_head *list, enum skb_state state)
426 {
427 unsigned long flags;
428 enum skb_state old_state;
429 struct skb_data *entry = (struct skb_data *) skb->cb;
430
431 spin_lock_irqsave(&list->lock, flags);
432 old_state = entry->state;
433 entry->state = state;
434 __skb_unlink(skb, list);
435
436 /* defer_bh() is never called with list == &dev->done.
437 * spin_lock_nested() tells lockdep that it is OK to take
438 * dev->done.lock here with list->lock held.
439 */
440 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
441
442 __skb_queue_tail(&dev->done, skb);
443 if (dev->done.qlen == 1)
444 tasklet_schedule(&dev->bh);
445 spin_unlock(&dev->done.lock);
446 spin_unlock_irqrestore(&list->lock, flags);
447 return old_state;
448 }
449
450 /* some work can't be done in tasklets, so we use keventd
451 *
452 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
453 * but tasklet_schedule() doesn't. hope the failure is rare.
454 */
455 void usbnet_defer_kevent (struct usbnet *dev, int work)
456 {
457 set_bit (work, &dev->flags);
458 if (!schedule_work (&dev->kevent)) {
459 if (net_ratelimit())
460 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
461 } else {
462 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
463 }
464 }
465 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
466
467 /*-------------------------------------------------------------------------*/
468
469 static void rx_complete (struct urb *urb);
470
471 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
472 {
473 struct sk_buff *skb;
474 struct skb_data *entry;
475 int retval = 0;
476 unsigned long lockflags;
477 size_t size = dev->rx_urb_size;
478
479 /* prevent rx skb allocation when error ratio is high */
480 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
481 usb_free_urb(urb);
482 return -ENOLINK;
483 }
484
485 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
486 if (!skb) {
487 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
488 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
489 usb_free_urb (urb);
490 return -ENOMEM;
491 }
492
493 entry = (struct skb_data *) skb->cb;
494 entry->urb = urb;
495 entry->dev = dev;
496 entry->length = 0;
497
498 usb_fill_bulk_urb (urb, dev->udev, dev->in,
499 skb->data, size, rx_complete, skb);
500
501 spin_lock_irqsave (&dev->rxq.lock, lockflags);
502
503 if (netif_running (dev->net) &&
504 netif_device_present (dev->net) &&
505 !test_bit (EVENT_RX_HALT, &dev->flags) &&
506 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
507 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
508 case -EPIPE:
509 usbnet_defer_kevent (dev, EVENT_RX_HALT);
510 break;
511 case -ENOMEM:
512 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
513 break;
514 case -ENODEV:
515 netif_dbg(dev, ifdown, dev->net, "device gone\n");
516 netif_device_detach (dev->net);
517 break;
518 case -EHOSTUNREACH:
519 retval = -ENOLINK;
520 break;
521 default:
522 netif_dbg(dev, rx_err, dev->net,
523 "rx submit, %d\n", retval);
524 tasklet_schedule (&dev->bh);
525 break;
526 case 0:
527 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
528 }
529 } else {
530 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
531 retval = -ENOLINK;
532 }
533 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
534 if (retval) {
535 dev_kfree_skb_any (skb);
536 usb_free_urb (urb);
537 }
538 return retval;
539 }
540
541
542 /*-------------------------------------------------------------------------*/
543
544 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
545 {
546 if (dev->driver_info->rx_fixup &&
547 !dev->driver_info->rx_fixup (dev, skb)) {
548 /* With RX_ASSEMBLE, rx_fixup() must update counters */
549 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
550 dev->net->stats.rx_errors++;
551 goto done;
552 }
553 // else network stack removes extra byte if we forced a short packet
554
555 /* all data was already cloned from skb inside the driver */
556 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
557 goto done;
558
559 if (skb->len < ETH_HLEN) {
560 dev->net->stats.rx_errors++;
561 dev->net->stats.rx_length_errors++;
562 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
563 } else {
564 usbnet_skb_return(dev, skb);
565 return;
566 }
567
568 done:
569 skb_queue_tail(&dev->done, skb);
570 }
571
572 /*-------------------------------------------------------------------------*/
573
574 static void rx_complete (struct urb *urb)
575 {
576 struct sk_buff *skb = (struct sk_buff *) urb->context;
577 struct skb_data *entry = (struct skb_data *) skb->cb;
578 struct usbnet *dev = entry->dev;
579 int urb_status = urb->status;
580 enum skb_state state;
581
582 skb_put (skb, urb->actual_length);
583 state = rx_done;
584 entry->urb = NULL;
585
586 switch (urb_status) {
587 /* success */
588 case 0:
589 break;
590
591 /* stalls need manual reset. this is rare ... except that
592 * when going through USB 2.0 TTs, unplug appears this way.
593 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
594 * storm, recovering as needed.
595 */
596 case -EPIPE:
597 dev->net->stats.rx_errors++;
598 usbnet_defer_kevent (dev, EVENT_RX_HALT);
599 // FALLTHROUGH
600
601 /* software-driven interface shutdown */
602 case -ECONNRESET: /* async unlink */
603 case -ESHUTDOWN: /* hardware gone */
604 netif_dbg(dev, ifdown, dev->net,
605 "rx shutdown, code %d\n", urb_status);
606 goto block;
607
608 /* we get controller i/o faults during hub_wq disconnect() delays.
609 * throttle down resubmits, to avoid log floods; just temporarily,
610 * so we still recover when the fault isn't a hub_wq delay.
611 */
612 case -EPROTO:
613 case -ETIME:
614 case -EILSEQ:
615 dev->net->stats.rx_errors++;
616 if (!timer_pending (&dev->delay)) {
617 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
618 netif_dbg(dev, link, dev->net,
619 "rx throttle %d\n", urb_status);
620 }
621 block:
622 state = rx_cleanup;
623 entry->urb = urb;
624 urb = NULL;
625 break;
626
627 /* data overrun ... flush fifo? */
628 case -EOVERFLOW:
629 dev->net->stats.rx_over_errors++;
630 // FALLTHROUGH
631
632 default:
633 state = rx_cleanup;
634 dev->net->stats.rx_errors++;
635 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
636 break;
637 }
638
639 /* stop rx if packet error rate is high */
640 if (++dev->pkt_cnt > 30) {
641 dev->pkt_cnt = 0;
642 dev->pkt_err = 0;
643 } else {
644 if (state == rx_cleanup)
645 dev->pkt_err++;
646 if (dev->pkt_err > 20)
647 set_bit(EVENT_RX_KILL, &dev->flags);
648 }
649
650 state = defer_bh(dev, skb, &dev->rxq, state);
651
652 if (urb) {
653 if (netif_running (dev->net) &&
654 !test_bit (EVENT_RX_HALT, &dev->flags) &&
655 state != unlink_start) {
656 rx_submit (dev, urb, GFP_ATOMIC);
657 usb_mark_last_busy(dev->udev);
658 return;
659 }
660 usb_free_urb (urb);
661 }
662 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
663 }
664
665 /*-------------------------------------------------------------------------*/
666 void usbnet_pause_rx(struct usbnet *dev)
667 {
668 set_bit(EVENT_RX_PAUSED, &dev->flags);
669
670 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
671 }
672 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
673
674 void usbnet_resume_rx(struct usbnet *dev)
675 {
676 struct sk_buff *skb;
677 int num = 0;
678
679 clear_bit(EVENT_RX_PAUSED, &dev->flags);
680
681 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
682 usbnet_skb_return(dev, skb);
683 num++;
684 }
685
686 tasklet_schedule(&dev->bh);
687
688 netif_dbg(dev, rx_status, dev->net,
689 "paused rx queue disabled, %d skbs requeued\n", num);
690 }
691 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
692
693 void usbnet_purge_paused_rxq(struct usbnet *dev)
694 {
695 skb_queue_purge(&dev->rxq_pause);
696 }
697 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
698
699 /*-------------------------------------------------------------------------*/
700
701 // unlink pending rx/tx; completion handlers do all other cleanup
702
703 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
704 {
705 unsigned long flags;
706 struct sk_buff *skb;
707 int count = 0;
708
709 spin_lock_irqsave (&q->lock, flags);
710 while (!skb_queue_empty(q)) {
711 struct skb_data *entry;
712 struct urb *urb;
713 int retval;
714
715 skb_queue_walk(q, skb) {
716 entry = (struct skb_data *) skb->cb;
717 if (entry->state != unlink_start)
718 goto found;
719 }
720 break;
721 found:
722 entry->state = unlink_start;
723 urb = entry->urb;
724
725 /*
726 * Get reference count of the URB to avoid it to be
727 * freed during usb_unlink_urb, which may trigger
728 * use-after-free problem inside usb_unlink_urb since
729 * usb_unlink_urb is always racing with .complete
730 * handler(include defer_bh).
731 */
732 usb_get_urb(urb);
733 spin_unlock_irqrestore(&q->lock, flags);
734 // during some PM-driven resume scenarios,
735 // these (async) unlinks complete immediately
736 retval = usb_unlink_urb (urb);
737 if (retval != -EINPROGRESS && retval != 0)
738 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
739 else
740 count++;
741 usb_put_urb(urb);
742 spin_lock_irqsave(&q->lock, flags);
743 }
744 spin_unlock_irqrestore (&q->lock, flags);
745 return count;
746 }
747
748 // Flush all pending rx urbs
749 // minidrivers may need to do this when the MTU changes
750
751 void usbnet_unlink_rx_urbs(struct usbnet *dev)
752 {
753 if (netif_running(dev->net)) {
754 (void) unlink_urbs (dev, &dev->rxq);
755 tasklet_schedule(&dev->bh);
756 }
757 }
758 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
759
760 /*-------------------------------------------------------------------------*/
761
762 static void wait_skb_queue_empty(struct sk_buff_head *q)
763 {
764 unsigned long flags;
765
766 spin_lock_irqsave(&q->lock, flags);
767 while (!skb_queue_empty(q)) {
768 spin_unlock_irqrestore(&q->lock, flags);
769 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
770 set_current_state(TASK_UNINTERRUPTIBLE);
771 spin_lock_irqsave(&q->lock, flags);
772 }
773 spin_unlock_irqrestore(&q->lock, flags);
774 }
775
776 // precondition: never called in_interrupt
777 static void usbnet_terminate_urbs(struct usbnet *dev)
778 {
779 DECLARE_WAITQUEUE(wait, current);
780 int temp;
781
782 /* ensure there are no more active urbs */
783 add_wait_queue(&dev->wait, &wait);
784 set_current_state(TASK_UNINTERRUPTIBLE);
785 temp = unlink_urbs(dev, &dev->txq) +
786 unlink_urbs(dev, &dev->rxq);
787
788 /* maybe wait for deletions to finish. */
789 wait_skb_queue_empty(&dev->rxq);
790 wait_skb_queue_empty(&dev->txq);
791 wait_skb_queue_empty(&dev->done);
792 netif_dbg(dev, ifdown, dev->net,
793 "waited for %d urb completions\n", temp);
794 set_current_state(TASK_RUNNING);
795 remove_wait_queue(&dev->wait, &wait);
796 }
797
798 int usbnet_stop (struct net_device *net)
799 {
800 struct usbnet *dev = netdev_priv(net);
801 struct driver_info *info = dev->driver_info;
802 int retval, pm, mpn;
803
804 clear_bit(EVENT_DEV_OPEN, &dev->flags);
805 netif_stop_queue (net);
806
807 netif_info(dev, ifdown, dev->net,
808 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
809 net->stats.rx_packets, net->stats.tx_packets,
810 net->stats.rx_errors, net->stats.tx_errors);
811
812 /* to not race resume */
813 pm = usb_autopm_get_interface(dev->intf);
814 /* allow minidriver to stop correctly (wireless devices to turn off
815 * radio etc) */
816 if (info->stop) {
817 retval = info->stop(dev);
818 if (retval < 0)
819 netif_info(dev, ifdown, dev->net,
820 "stop fail (%d) usbnet usb-%s-%s, %s\n",
821 retval,
822 dev->udev->bus->bus_name, dev->udev->devpath,
823 info->description);
824 }
825
826 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
827 usbnet_terminate_urbs(dev);
828
829 usbnet_status_stop(dev);
830
831 usbnet_purge_paused_rxq(dev);
832
833 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
834
835 /* deferred work (task, timer, softirq) must also stop.
836 * can't flush_scheduled_work() until we drop rtnl (later),
837 * else workers could deadlock; so make workers a NOP.
838 */
839 dev->flags = 0;
840 del_timer_sync (&dev->delay);
841 tasklet_kill (&dev->bh);
842 if (!pm)
843 usb_autopm_put_interface(dev->intf);
844
845 if (info->manage_power && mpn)
846 info->manage_power(dev, 0);
847 else
848 usb_autopm_put_interface(dev->intf);
849
850 return 0;
851 }
852 EXPORT_SYMBOL_GPL(usbnet_stop);
853
854 /*-------------------------------------------------------------------------*/
855
856 // posts reads, and enables write queuing
857
858 // precondition: never called in_interrupt
859
860 int usbnet_open (struct net_device *net)
861 {
862 struct usbnet *dev = netdev_priv(net);
863 int retval;
864 struct driver_info *info = dev->driver_info;
865
866 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
867 netif_info(dev, ifup, dev->net,
868 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
869 retval,
870 dev->udev->bus->bus_name,
871 dev->udev->devpath,
872 info->description);
873 goto done_nopm;
874 }
875
876 // put into "known safe" state
877 if (info->reset && (retval = info->reset (dev)) < 0) {
878 netif_info(dev, ifup, dev->net,
879 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
880 retval,
881 dev->udev->bus->bus_name,
882 dev->udev->devpath,
883 info->description);
884 goto done;
885 }
886
887 /* hard_mtu or rx_urb_size may change in reset() */
888 usbnet_update_max_qlen(dev);
889
890 // insist peer be connected
891 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
892 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
893 goto done;
894 }
895
896 /* start any status interrupt transfer */
897 if (dev->interrupt) {
898 retval = usbnet_status_start(dev, GFP_KERNEL);
899 if (retval < 0) {
900 netif_err(dev, ifup, dev->net,
901 "intr submit %d\n", retval);
902 goto done;
903 }
904 }
905
906 set_bit(EVENT_DEV_OPEN, &dev->flags);
907 netif_start_queue (net);
908 netif_info(dev, ifup, dev->net,
909 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
910 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
911 dev->net->mtu,
912 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
913 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
914 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
915 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
916 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
917 "simple");
918
919 /* reset rx error state */
920 dev->pkt_cnt = 0;
921 dev->pkt_err = 0;
922 clear_bit(EVENT_RX_KILL, &dev->flags);
923
924 // delay posting reads until we're fully open
925 tasklet_schedule (&dev->bh);
926 if (info->manage_power) {
927 retval = info->manage_power(dev, 1);
928 if (retval < 0) {
929 retval = 0;
930 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
931 } else {
932 usb_autopm_put_interface(dev->intf);
933 }
934 }
935 return retval;
936 done:
937 usb_autopm_put_interface(dev->intf);
938 done_nopm:
939 return retval;
940 }
941 EXPORT_SYMBOL_GPL(usbnet_open);
942
943 /*-------------------------------------------------------------------------*/
944
945 /* ethtool methods; minidrivers may need to add some more, but
946 * they'll probably want to use this base set.
947 */
948
949 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
950 {
951 struct usbnet *dev = netdev_priv(net);
952
953 if (!dev->mii.mdio_read)
954 return -EOPNOTSUPP;
955
956 return mii_ethtool_gset(&dev->mii, cmd);
957 }
958 EXPORT_SYMBOL_GPL(usbnet_get_settings);
959
960 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
961 {
962 struct usbnet *dev = netdev_priv(net);
963 int retval;
964
965 if (!dev->mii.mdio_write)
966 return -EOPNOTSUPP;
967
968 retval = mii_ethtool_sset(&dev->mii, cmd);
969
970 /* link speed/duplex might have changed */
971 if (dev->driver_info->link_reset)
972 dev->driver_info->link_reset(dev);
973
974 /* hard_mtu or rx_urb_size may change in link_reset() */
975 usbnet_update_max_qlen(dev);
976
977 return retval;
978
979 }
980 EXPORT_SYMBOL_GPL(usbnet_set_settings);
981
982 u32 usbnet_get_link (struct net_device *net)
983 {
984 struct usbnet *dev = netdev_priv(net);
985
986 /* If a check_connect is defined, return its result */
987 if (dev->driver_info->check_connect)
988 return dev->driver_info->check_connect (dev) == 0;
989
990 /* if the device has mii operations, use those */
991 if (dev->mii.mdio_read)
992 return mii_link_ok(&dev->mii);
993
994 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
995 return ethtool_op_get_link(net);
996 }
997 EXPORT_SYMBOL_GPL(usbnet_get_link);
998
999 int usbnet_nway_reset(struct net_device *net)
1000 {
1001 struct usbnet *dev = netdev_priv(net);
1002
1003 if (!dev->mii.mdio_write)
1004 return -EOPNOTSUPP;
1005
1006 return mii_nway_restart(&dev->mii);
1007 }
1008 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1009
1010 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1011 {
1012 struct usbnet *dev = netdev_priv(net);
1013
1014 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1015 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1016 strlcpy (info->fw_version, dev->driver_info->description,
1017 sizeof info->fw_version);
1018 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1019 }
1020 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1021
1022 u32 usbnet_get_msglevel (struct net_device *net)
1023 {
1024 struct usbnet *dev = netdev_priv(net);
1025
1026 return dev->msg_enable;
1027 }
1028 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1029
1030 void usbnet_set_msglevel (struct net_device *net, u32 level)
1031 {
1032 struct usbnet *dev = netdev_priv(net);
1033
1034 dev->msg_enable = level;
1035 }
1036 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1037
1038 /* drivers may override default ethtool_ops in their bind() routine */
1039 static const struct ethtool_ops usbnet_ethtool_ops = {
1040 .get_settings = usbnet_get_settings,
1041 .set_settings = usbnet_set_settings,
1042 .get_link = usbnet_get_link,
1043 .nway_reset = usbnet_nway_reset,
1044 .get_drvinfo = usbnet_get_drvinfo,
1045 .get_msglevel = usbnet_get_msglevel,
1046 .set_msglevel = usbnet_set_msglevel,
1047 .get_ts_info = ethtool_op_get_ts_info,
1048 };
1049
1050 /*-------------------------------------------------------------------------*/
1051
1052 static void __handle_link_change(struct usbnet *dev)
1053 {
1054 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1055 return;
1056
1057 if (!netif_carrier_ok(dev->net)) {
1058 /* kill URBs for reading packets to save bus bandwidth */
1059 unlink_urbs(dev, &dev->rxq);
1060
1061 /*
1062 * tx_timeout will unlink URBs for sending packets and
1063 * tx queue is stopped by netcore after link becomes off
1064 */
1065 } else {
1066 /* submitting URBs for reading packets */
1067 tasklet_schedule(&dev->bh);
1068 }
1069
1070 /* hard_mtu or rx_urb_size may change during link change */
1071 usbnet_update_max_qlen(dev);
1072
1073 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1074 }
1075
1076 static void usbnet_set_rx_mode(struct net_device *net)
1077 {
1078 struct usbnet *dev = netdev_priv(net);
1079
1080 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1081 }
1082
1083 static void __handle_set_rx_mode(struct usbnet *dev)
1084 {
1085 if (dev->driver_info->set_rx_mode)
1086 (dev->driver_info->set_rx_mode)(dev);
1087
1088 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1089 }
1090
1091 /* work that cannot be done in interrupt context uses keventd.
1092 *
1093 * NOTE: with 2.5 we could do more of this using completion callbacks,
1094 * especially now that control transfers can be queued.
1095 */
1096 static void
1097 usbnet_deferred_kevent (struct work_struct *work)
1098 {
1099 struct usbnet *dev =
1100 container_of(work, struct usbnet, kevent);
1101 int status;
1102
1103 /* usb_clear_halt() needs a thread context */
1104 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1105 unlink_urbs (dev, &dev->txq);
1106 status = usb_autopm_get_interface(dev->intf);
1107 if (status < 0)
1108 goto fail_pipe;
1109 status = usb_clear_halt (dev->udev, dev->out);
1110 usb_autopm_put_interface(dev->intf);
1111 if (status < 0 &&
1112 status != -EPIPE &&
1113 status != -ESHUTDOWN) {
1114 if (netif_msg_tx_err (dev))
1115 fail_pipe:
1116 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1117 status);
1118 } else {
1119 clear_bit (EVENT_TX_HALT, &dev->flags);
1120 if (status != -ESHUTDOWN)
1121 netif_wake_queue (dev->net);
1122 }
1123 }
1124 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1125 unlink_urbs (dev, &dev->rxq);
1126 status = usb_autopm_get_interface(dev->intf);
1127 if (status < 0)
1128 goto fail_halt;
1129 status = usb_clear_halt (dev->udev, dev->in);
1130 usb_autopm_put_interface(dev->intf);
1131 if (status < 0 &&
1132 status != -EPIPE &&
1133 status != -ESHUTDOWN) {
1134 if (netif_msg_rx_err (dev))
1135 fail_halt:
1136 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1137 status);
1138 } else {
1139 clear_bit (EVENT_RX_HALT, &dev->flags);
1140 tasklet_schedule (&dev->bh);
1141 }
1142 }
1143
1144 /* tasklet could resubmit itself forever if memory is tight */
1145 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1146 struct urb *urb = NULL;
1147 int resched = 1;
1148
1149 if (netif_running (dev->net))
1150 urb = usb_alloc_urb (0, GFP_KERNEL);
1151 else
1152 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1153 if (urb != NULL) {
1154 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1155 status = usb_autopm_get_interface(dev->intf);
1156 if (status < 0) {
1157 usb_free_urb(urb);
1158 goto fail_lowmem;
1159 }
1160 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1161 resched = 0;
1162 usb_autopm_put_interface(dev->intf);
1163 fail_lowmem:
1164 if (resched)
1165 tasklet_schedule (&dev->bh);
1166 }
1167 }
1168
1169 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1170 struct driver_info *info = dev->driver_info;
1171 int retval = 0;
1172
1173 clear_bit (EVENT_LINK_RESET, &dev->flags);
1174 status = usb_autopm_get_interface(dev->intf);
1175 if (status < 0)
1176 goto skip_reset;
1177 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1178 usb_autopm_put_interface(dev->intf);
1179 skip_reset:
1180 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1181 retval,
1182 dev->udev->bus->bus_name,
1183 dev->udev->devpath,
1184 info->description);
1185 } else {
1186 usb_autopm_put_interface(dev->intf);
1187 }
1188
1189 /* handle link change from link resetting */
1190 __handle_link_change(dev);
1191 }
1192
1193 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1194 __handle_link_change(dev);
1195
1196 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1197 __handle_set_rx_mode(dev);
1198
1199
1200 if (dev->flags)
1201 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1202 }
1203
1204 /*-------------------------------------------------------------------------*/
1205
1206 static void tx_complete (struct urb *urb)
1207 {
1208 struct sk_buff *skb = (struct sk_buff *) urb->context;
1209 struct skb_data *entry = (struct skb_data *) skb->cb;
1210 struct usbnet *dev = entry->dev;
1211
1212 if (urb->status == 0) {
1213 dev->net->stats.tx_packets += entry->packets;
1214 dev->net->stats.tx_bytes += entry->length;
1215 } else {
1216 dev->net->stats.tx_errors++;
1217
1218 switch (urb->status) {
1219 case -EPIPE:
1220 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1221 break;
1222
1223 /* software-driven interface shutdown */
1224 case -ECONNRESET: // async unlink
1225 case -ESHUTDOWN: // hardware gone
1226 break;
1227
1228 /* like rx, tx gets controller i/o faults during hub_wq
1229 * delays and so it uses the same throttling mechanism.
1230 */
1231 case -EPROTO:
1232 case -ETIME:
1233 case -EILSEQ:
1234 usb_mark_last_busy(dev->udev);
1235 if (!timer_pending (&dev->delay)) {
1236 mod_timer (&dev->delay,
1237 jiffies + THROTTLE_JIFFIES);
1238 netif_dbg(dev, link, dev->net,
1239 "tx throttle %d\n", urb->status);
1240 }
1241 netif_stop_queue (dev->net);
1242 break;
1243 default:
1244 netif_dbg(dev, tx_err, dev->net,
1245 "tx err %d\n", entry->urb->status);
1246 break;
1247 }
1248 }
1249
1250 usb_autopm_put_interface_async(dev->intf);
1251 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1252 }
1253
1254 /*-------------------------------------------------------------------------*/
1255
1256 void usbnet_tx_timeout (struct net_device *net)
1257 {
1258 struct usbnet *dev = netdev_priv(net);
1259
1260 unlink_urbs (dev, &dev->txq);
1261 tasklet_schedule (&dev->bh);
1262 /* this needs to be handled individually because the generic layer
1263 * doesn't know what is sufficient and could not restore private
1264 * information if a remedy of an unconditional reset were used.
1265 */
1266 if (dev->driver_info->recover)
1267 (dev->driver_info->recover)(dev);
1268 }
1269 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1270
1271 /*-------------------------------------------------------------------------*/
1272
1273 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1274 {
1275 unsigned num_sgs, total_len = 0;
1276 int i, s = 0;
1277
1278 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1279 if (num_sgs == 1)
1280 return 0;
1281
1282 /* reserve one for zero packet */
1283 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1284 GFP_ATOMIC);
1285 if (!urb->sg)
1286 return -ENOMEM;
1287
1288 urb->num_sgs = num_sgs;
1289 sg_init_table(urb->sg, urb->num_sgs + 1);
1290
1291 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1292 total_len += skb_headlen(skb);
1293
1294 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1295 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1296
1297 total_len += skb_frag_size(f);
1298 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1299 f->page_offset);
1300 }
1301 urb->transfer_buffer_length = total_len;
1302
1303 return 1;
1304 }
1305
1306 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1307 struct net_device *net)
1308 {
1309 struct usbnet *dev = netdev_priv(net);
1310 unsigned int length;
1311 struct urb *urb = NULL;
1312 struct skb_data *entry;
1313 struct driver_info *info = dev->driver_info;
1314 unsigned long flags;
1315 int retval;
1316
1317 if (skb)
1318 skb_tx_timestamp(skb);
1319
1320 // some devices want funky USB-level framing, for
1321 // win32 driver (usually) and/or hardware quirks
1322 if (info->tx_fixup) {
1323 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1324 if (!skb) {
1325 /* packet collected; minidriver waiting for more */
1326 if (info->flags & FLAG_MULTI_PACKET)
1327 goto not_drop;
1328 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1329 goto drop;
1330 }
1331 }
1332
1333 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1334 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1335 goto drop;
1336 }
1337
1338 entry = (struct skb_data *) skb->cb;
1339 entry->urb = urb;
1340 entry->dev = dev;
1341
1342 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1343 skb->data, skb->len, tx_complete, skb);
1344 if (dev->can_dma_sg) {
1345 if (build_dma_sg(skb, urb) < 0)
1346 goto drop;
1347 }
1348 length = urb->transfer_buffer_length;
1349
1350 /* don't assume the hardware handles USB_ZERO_PACKET
1351 * NOTE: strictly conforming cdc-ether devices should expect
1352 * the ZLP here, but ignore the one-byte packet.
1353 * NOTE2: CDC NCM specification is different from CDC ECM when
1354 * handling ZLP/short packets, so cdc_ncm driver will make short
1355 * packet itself if needed.
1356 */
1357 if (length % dev->maxpacket == 0) {
1358 if (!(info->flags & FLAG_SEND_ZLP)) {
1359 if (!(info->flags & FLAG_MULTI_PACKET)) {
1360 length++;
1361 if (skb_tailroom(skb) && !urb->num_sgs) {
1362 skb->data[skb->len] = 0;
1363 __skb_put(skb, 1);
1364 } else if (urb->num_sgs)
1365 sg_set_buf(&urb->sg[urb->num_sgs++],
1366 dev->padding_pkt, 1);
1367 }
1368 } else
1369 urb->transfer_flags |= URB_ZERO_PACKET;
1370 }
1371 urb->transfer_buffer_length = length;
1372
1373 if (info->flags & FLAG_MULTI_PACKET) {
1374 /* Driver has set number of packets and a length delta.
1375 * Calculate the complete length and ensure that it's
1376 * positive.
1377 */
1378 entry->length += length;
1379 if (WARN_ON_ONCE(entry->length <= 0))
1380 entry->length = length;
1381 } else {
1382 usbnet_set_skb_tx_stats(skb, 1, length);
1383 }
1384
1385 spin_lock_irqsave(&dev->txq.lock, flags);
1386 retval = usb_autopm_get_interface_async(dev->intf);
1387 if (retval < 0) {
1388 spin_unlock_irqrestore(&dev->txq.lock, flags);
1389 goto drop;
1390 }
1391
1392 #ifdef CONFIG_PM
1393 /* if this triggers the device is still a sleep */
1394 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1395 /* transmission will be done in resume */
1396 usb_anchor_urb(urb, &dev->deferred);
1397 /* no use to process more packets */
1398 netif_stop_queue(net);
1399 usb_put_urb(urb);
1400 spin_unlock_irqrestore(&dev->txq.lock, flags);
1401 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1402 goto deferred;
1403 }
1404 #endif
1405
1406 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1407 case -EPIPE:
1408 netif_stop_queue (net);
1409 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1410 usb_autopm_put_interface_async(dev->intf);
1411 break;
1412 default:
1413 usb_autopm_put_interface_async(dev->intf);
1414 netif_dbg(dev, tx_err, dev->net,
1415 "tx: submit urb err %d\n", retval);
1416 break;
1417 case 0:
1418 net->trans_start = jiffies;
1419 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1420 if (dev->txq.qlen >= TX_QLEN (dev))
1421 netif_stop_queue (net);
1422 }
1423 spin_unlock_irqrestore (&dev->txq.lock, flags);
1424
1425 if (retval) {
1426 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1427 drop:
1428 dev->net->stats.tx_dropped++;
1429 not_drop:
1430 if (skb)
1431 dev_kfree_skb_any (skb);
1432 if (urb) {
1433 kfree(urb->sg);
1434 usb_free_urb(urb);
1435 }
1436 } else
1437 netif_dbg(dev, tx_queued, dev->net,
1438 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1439 #ifdef CONFIG_PM
1440 deferred:
1441 #endif
1442 return NETDEV_TX_OK;
1443 }
1444 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1445
1446 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1447 {
1448 struct urb *urb;
1449 int i;
1450 int ret = 0;
1451
1452 /* don't refill the queue all at once */
1453 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1454 urb = usb_alloc_urb(0, flags);
1455 if (urb != NULL) {
1456 ret = rx_submit(dev, urb, flags);
1457 if (ret)
1458 goto err;
1459 } else {
1460 ret = -ENOMEM;
1461 goto err;
1462 }
1463 }
1464 err:
1465 return ret;
1466 }
1467
1468 /*-------------------------------------------------------------------------*/
1469
1470 // tasklet (work deferred from completions, in_irq) or timer
1471
1472 static void usbnet_bh (unsigned long param)
1473 {
1474 struct usbnet *dev = (struct usbnet *) param;
1475 struct sk_buff *skb;
1476 struct skb_data *entry;
1477
1478 while ((skb = skb_dequeue (&dev->done))) {
1479 entry = (struct skb_data *) skb->cb;
1480 switch (entry->state) {
1481 case rx_done:
1482 entry->state = rx_cleanup;
1483 rx_process (dev, skb);
1484 continue;
1485 case tx_done:
1486 kfree(entry->urb->sg);
1487 case rx_cleanup:
1488 usb_free_urb (entry->urb);
1489 dev_kfree_skb (skb);
1490 continue;
1491 default:
1492 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1493 }
1494 }
1495
1496 /* restart RX again after disabling due to high error rate */
1497 clear_bit(EVENT_RX_KILL, &dev->flags);
1498
1499 /* waiting for all pending urbs to complete?
1500 * only then can we forgo submitting anew
1501 */
1502 if (waitqueue_active(&dev->wait)) {
1503 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1504 wake_up_all(&dev->wait);
1505
1506 // or are we maybe short a few urbs?
1507 } else if (netif_running (dev->net) &&
1508 netif_device_present (dev->net) &&
1509 netif_carrier_ok(dev->net) &&
1510 !timer_pending (&dev->delay) &&
1511 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1512 int temp = dev->rxq.qlen;
1513
1514 if (temp < RX_QLEN(dev)) {
1515 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1516 return;
1517 if (temp != dev->rxq.qlen)
1518 netif_dbg(dev, link, dev->net,
1519 "rxqlen %d --> %d\n",
1520 temp, dev->rxq.qlen);
1521 if (dev->rxq.qlen < RX_QLEN(dev))
1522 tasklet_schedule (&dev->bh);
1523 }
1524 if (dev->txq.qlen < TX_QLEN (dev))
1525 netif_wake_queue (dev->net);
1526 }
1527 }
1528
1529
1530 /*-------------------------------------------------------------------------
1531 *
1532 * USB Device Driver support
1533 *
1534 *-------------------------------------------------------------------------*/
1535
1536 // precondition: never called in_interrupt
1537
1538 void usbnet_disconnect (struct usb_interface *intf)
1539 {
1540 struct usbnet *dev;
1541 struct usb_device *xdev;
1542 struct net_device *net;
1543
1544 dev = usb_get_intfdata(intf);
1545 usb_set_intfdata(intf, NULL);
1546 if (!dev)
1547 return;
1548
1549 xdev = interface_to_usbdev (intf);
1550
1551 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1552 intf->dev.driver->name,
1553 xdev->bus->bus_name, xdev->devpath,
1554 dev->driver_info->description);
1555
1556 net = dev->net;
1557 unregister_netdev (net);
1558
1559 cancel_work_sync(&dev->kevent);
1560
1561 usb_scuttle_anchored_urbs(&dev->deferred);
1562
1563 if (dev->driver_info->unbind)
1564 dev->driver_info->unbind (dev, intf);
1565
1566 usb_kill_urb(dev->interrupt);
1567 usb_free_urb(dev->interrupt);
1568 kfree(dev->padding_pkt);
1569
1570 free_netdev(net);
1571 }
1572 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1573
1574 static const struct net_device_ops usbnet_netdev_ops = {
1575 .ndo_open = usbnet_open,
1576 .ndo_stop = usbnet_stop,
1577 .ndo_start_xmit = usbnet_start_xmit,
1578 .ndo_tx_timeout = usbnet_tx_timeout,
1579 .ndo_set_rx_mode = usbnet_set_rx_mode,
1580 .ndo_change_mtu = usbnet_change_mtu,
1581 .ndo_set_mac_address = eth_mac_addr,
1582 .ndo_validate_addr = eth_validate_addr,
1583 };
1584
1585 /*-------------------------------------------------------------------------*/
1586
1587 // precondition: never called in_interrupt
1588
1589 static struct device_type wlan_type = {
1590 .name = "wlan",
1591 };
1592
1593 static struct device_type wwan_type = {
1594 .name = "wwan",
1595 };
1596
1597 int
1598 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1599 {
1600 struct usbnet *dev;
1601 struct net_device *net;
1602 struct usb_host_interface *interface;
1603 struct driver_info *info;
1604 struct usb_device *xdev;
1605 int status;
1606 const char *name;
1607 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1608
1609 /* usbnet already took usb runtime pm, so have to enable the feature
1610 * for usb interface, otherwise usb_autopm_get_interface may return
1611 * failure if RUNTIME_PM is enabled.
1612 */
1613 if (!driver->supports_autosuspend) {
1614 driver->supports_autosuspend = 1;
1615 pm_runtime_enable(&udev->dev);
1616 }
1617
1618 name = udev->dev.driver->name;
1619 info = (struct driver_info *) prod->driver_info;
1620 if (!info) {
1621 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1622 return -ENODEV;
1623 }
1624 xdev = interface_to_usbdev (udev);
1625 interface = udev->cur_altsetting;
1626
1627 status = -ENOMEM;
1628
1629 // set up our own records
1630 net = alloc_etherdev(sizeof(*dev));
1631 if (!net)
1632 goto out;
1633
1634 /* netdev_printk() needs this so do it as early as possible */
1635 SET_NETDEV_DEV(net, &udev->dev);
1636
1637 dev = netdev_priv(net);
1638 dev->udev = xdev;
1639 dev->intf = udev;
1640 dev->driver_info = info;
1641 dev->driver_name = name;
1642 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1643 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1644 init_waitqueue_head(&dev->wait);
1645 skb_queue_head_init (&dev->rxq);
1646 skb_queue_head_init (&dev->txq);
1647 skb_queue_head_init (&dev->done);
1648 skb_queue_head_init(&dev->rxq_pause);
1649 dev->bh.func = usbnet_bh;
1650 dev->bh.data = (unsigned long) dev;
1651 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1652 init_usb_anchor(&dev->deferred);
1653 dev->delay.function = usbnet_bh;
1654 dev->delay.data = (unsigned long) dev;
1655 init_timer (&dev->delay);
1656 mutex_init (&dev->phy_mutex);
1657 mutex_init(&dev->interrupt_mutex);
1658 dev->interrupt_count = 0;
1659
1660 dev->net = net;
1661 strcpy (net->name, "usb%d");
1662 memcpy (net->dev_addr, node_id, sizeof node_id);
1663
1664 /* rx and tx sides can use different message sizes;
1665 * bind() should set rx_urb_size in that case.
1666 */
1667 dev->hard_mtu = net->mtu + net->hard_header_len;
1668
1669 net->netdev_ops = &usbnet_netdev_ops;
1670 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1671 net->ethtool_ops = &usbnet_ethtool_ops;
1672
1673 // allow device-specific bind/init procedures
1674 // NOTE net->name still not usable ...
1675 if (info->bind) {
1676 status = info->bind (dev, udev);
1677 if (status < 0)
1678 goto out1;
1679
1680 // heuristic: "usb%d" for links we know are two-host,
1681 // else "eth%d" when there's reasonable doubt. userspace
1682 // can rename the link if it knows better.
1683 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1684 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1685 (net->dev_addr [0] & 0x02) == 0))
1686 strcpy (net->name, "eth%d");
1687 /* WLAN devices should always be named "wlan%d" */
1688 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1689 strcpy(net->name, "wlan%d");
1690 /* WWAN devices should always be named "wwan%d" */
1691 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1692 strcpy(net->name, "wwan%d");
1693
1694 /* devices that cannot do ARP */
1695 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1696 net->flags |= IFF_NOARP;
1697
1698 /* maybe the remote can't receive an Ethernet MTU */
1699 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1700 net->mtu = dev->hard_mtu - net->hard_header_len;
1701 } else if (!info->in || !info->out)
1702 status = usbnet_get_endpoints (dev, udev);
1703 else {
1704 dev->in = usb_rcvbulkpipe (xdev, info->in);
1705 dev->out = usb_sndbulkpipe (xdev, info->out);
1706 if (!(info->flags & FLAG_NO_SETINT))
1707 status = usb_set_interface (xdev,
1708 interface->desc.bInterfaceNumber,
1709 interface->desc.bAlternateSetting);
1710 else
1711 status = 0;
1712
1713 }
1714 if (status >= 0 && dev->status)
1715 status = init_status (dev, udev);
1716 if (status < 0)
1717 goto out3;
1718
1719 if (!dev->rx_urb_size)
1720 dev->rx_urb_size = dev->hard_mtu;
1721 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1722
1723 /* let userspace know we have a random address */
1724 if (ether_addr_equal(net->dev_addr, node_id))
1725 net->addr_assign_type = NET_ADDR_RANDOM;
1726
1727 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1728 SET_NETDEV_DEVTYPE(net, &wlan_type);
1729 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1730 SET_NETDEV_DEVTYPE(net, &wwan_type);
1731
1732 /* initialize max rx_qlen and tx_qlen */
1733 usbnet_update_max_qlen(dev);
1734
1735 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1736 !(info->flags & FLAG_MULTI_PACKET)) {
1737 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1738 if (!dev->padding_pkt) {
1739 status = -ENOMEM;
1740 goto out4;
1741 }
1742 }
1743
1744 status = register_netdev (net);
1745 if (status)
1746 goto out5;
1747 netif_info(dev, probe, dev->net,
1748 "register '%s' at usb-%s-%s, %s, %pM\n",
1749 udev->dev.driver->name,
1750 xdev->bus->bus_name, xdev->devpath,
1751 dev->driver_info->description,
1752 net->dev_addr);
1753
1754 // ok, it's ready to go.
1755 usb_set_intfdata (udev, dev);
1756
1757 netif_device_attach (net);
1758
1759 if (dev->driver_info->flags & FLAG_LINK_INTR)
1760 usbnet_link_change(dev, 0, 0);
1761
1762 return 0;
1763
1764 out5:
1765 kfree(dev->padding_pkt);
1766 out4:
1767 usb_free_urb(dev->interrupt);
1768 out3:
1769 if (info->unbind)
1770 info->unbind (dev, udev);
1771 out1:
1772 /* subdrivers must undo all they did in bind() if they
1773 * fail it, but we may fail later and a deferred kevent
1774 * may trigger an error resubmitting itself and, worse,
1775 * schedule a timer. So we kill it all just in case.
1776 */
1777 cancel_work_sync(&dev->kevent);
1778 del_timer_sync(&dev->delay);
1779 free_netdev(net);
1780 out:
1781 return status;
1782 }
1783 EXPORT_SYMBOL_GPL(usbnet_probe);
1784
1785 /*-------------------------------------------------------------------------*/
1786
1787 /*
1788 * suspend the whole driver as soon as the first interface is suspended
1789 * resume only when the last interface is resumed
1790 */
1791
1792 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1793 {
1794 struct usbnet *dev = usb_get_intfdata(intf);
1795
1796 if (!dev->suspend_count++) {
1797 spin_lock_irq(&dev->txq.lock);
1798 /* don't autosuspend while transmitting */
1799 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1800 dev->suspend_count--;
1801 spin_unlock_irq(&dev->txq.lock);
1802 return -EBUSY;
1803 } else {
1804 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1805 spin_unlock_irq(&dev->txq.lock);
1806 }
1807 /*
1808 * accelerate emptying of the rx and queues, to avoid
1809 * having everything error out.
1810 */
1811 netif_device_detach (dev->net);
1812 usbnet_terminate_urbs(dev);
1813 __usbnet_status_stop_force(dev);
1814
1815 /*
1816 * reattach so runtime management can use and
1817 * wake the device
1818 */
1819 netif_device_attach (dev->net);
1820 }
1821 return 0;
1822 }
1823 EXPORT_SYMBOL_GPL(usbnet_suspend);
1824
1825 int usbnet_resume (struct usb_interface *intf)
1826 {
1827 struct usbnet *dev = usb_get_intfdata(intf);
1828 struct sk_buff *skb;
1829 struct urb *res;
1830 int retval;
1831
1832 if (!--dev->suspend_count) {
1833 /* resume interrupt URB if it was previously submitted */
1834 __usbnet_status_start_force(dev, GFP_NOIO);
1835
1836 spin_lock_irq(&dev->txq.lock);
1837 while ((res = usb_get_from_anchor(&dev->deferred))) {
1838
1839 skb = (struct sk_buff *)res->context;
1840 retval = usb_submit_urb(res, GFP_ATOMIC);
1841 if (retval < 0) {
1842 dev_kfree_skb_any(skb);
1843 kfree(res->sg);
1844 usb_free_urb(res);
1845 usb_autopm_put_interface_async(dev->intf);
1846 } else {
1847 dev->net->trans_start = jiffies;
1848 __skb_queue_tail(&dev->txq, skb);
1849 }
1850 }
1851
1852 smp_mb();
1853 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1854 spin_unlock_irq(&dev->txq.lock);
1855
1856 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1857 /* handle remote wakeup ASAP
1858 * we cannot race against stop
1859 */
1860 if (netif_device_present(dev->net) &&
1861 !timer_pending(&dev->delay) &&
1862 !test_bit(EVENT_RX_HALT, &dev->flags))
1863 rx_alloc_submit(dev, GFP_NOIO);
1864
1865 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1866 netif_tx_wake_all_queues(dev->net);
1867 tasklet_schedule (&dev->bh);
1868 }
1869 }
1870
1871 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1872 usb_autopm_get_interface_no_resume(intf);
1873
1874 return 0;
1875 }
1876 EXPORT_SYMBOL_GPL(usbnet_resume);
1877
1878 /*
1879 * Either a subdriver implements manage_power, then it is assumed to always
1880 * be ready to be suspended or it reports the readiness to be suspended
1881 * explicitly
1882 */
1883 void usbnet_device_suggests_idle(struct usbnet *dev)
1884 {
1885 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1886 dev->intf->needs_remote_wakeup = 1;
1887 usb_autopm_put_interface_async(dev->intf);
1888 }
1889 }
1890 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1891
1892 /*
1893 * For devices that can do without special commands
1894 */
1895 int usbnet_manage_power(struct usbnet *dev, int on)
1896 {
1897 dev->intf->needs_remote_wakeup = on;
1898 return 0;
1899 }
1900 EXPORT_SYMBOL(usbnet_manage_power);
1901
1902 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1903 {
1904 /* update link after link is reseted */
1905 if (link && !need_reset)
1906 netif_carrier_on(dev->net);
1907 else
1908 netif_carrier_off(dev->net);
1909
1910 if (need_reset && link)
1911 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1912 else
1913 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1914 }
1915 EXPORT_SYMBOL(usbnet_link_change);
1916
1917 /*-------------------------------------------------------------------------*/
1918 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1919 u16 value, u16 index, void *data, u16 size)
1920 {
1921 void *buf = NULL;
1922 int err = -ENOMEM;
1923
1924 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1925 " value=0x%04x index=0x%04x size=%d\n",
1926 cmd, reqtype, value, index, size);
1927
1928 if (data) {
1929 buf = kmalloc(size, GFP_KERNEL);
1930 if (!buf)
1931 goto out;
1932 }
1933
1934 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1935 cmd, reqtype, value, index, buf, size,
1936 USB_CTRL_GET_TIMEOUT);
1937 if (err > 0 && err <= size)
1938 memcpy(data, buf, err);
1939 kfree(buf);
1940 out:
1941 return err;
1942 }
1943
1944 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1945 u16 value, u16 index, const void *data,
1946 u16 size)
1947 {
1948 void *buf = NULL;
1949 int err = -ENOMEM;
1950
1951 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1952 " value=0x%04x index=0x%04x size=%d\n",
1953 cmd, reqtype, value, index, size);
1954
1955 if (data) {
1956 buf = kmemdup(data, size, GFP_KERNEL);
1957 if (!buf)
1958 goto out;
1959 }
1960
1961 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1962 cmd, reqtype, value, index, buf, size,
1963 USB_CTRL_SET_TIMEOUT);
1964 kfree(buf);
1965
1966 out:
1967 return err;
1968 }
1969
1970 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr,
1971 struct usb_interface *intf,
1972 u8 *buffer,
1973 int buflen)
1974 {
1975 /* duplicates are ignored */
1976 struct usb_cdc_union_desc *union_header = NULL;
1977
1978 /* duplicates are not tolerated */
1979 struct usb_cdc_header_desc *header = NULL;
1980 struct usb_cdc_ether_desc *ether = NULL;
1981 struct usb_cdc_mdlm_detail_desc *detail = NULL;
1982 struct usb_cdc_mdlm_desc *desc = NULL;
1983
1984 unsigned int elength;
1985 int cnt = 0;
1986
1987 memset(hdr, 0x00, sizeof(struct usb_cdc_parsed_header));
1988 hdr->phonet_magic_present = false;
1989 while (buflen > 0) {
1990 elength = buffer[0];
1991 if (!elength) {
1992 dev_err(&intf->dev, "skipping garbage byte\n");
1993 elength = 1;
1994 goto next_desc;
1995 }
1996 if (buffer[1] != USB_DT_CS_INTERFACE) {
1997 dev_err(&intf->dev, "skipping garbage\n");
1998 goto next_desc;
1999 }
2000
2001 switch (buffer[2]) {
2002 case USB_CDC_UNION_TYPE: /* we've found it */
2003 if (elength < sizeof(struct usb_cdc_union_desc))
2004 goto next_desc;
2005 if (union_header) {
2006 dev_err(&intf->dev, "More than one union descriptor, skipping ...\n");
2007 goto next_desc;
2008 }
2009 union_header = (struct usb_cdc_union_desc *)buffer;
2010 break;
2011 case USB_CDC_COUNTRY_TYPE:
2012 if (elength < sizeof(struct usb_cdc_country_functional_desc))
2013 goto next_desc;
2014 hdr->usb_cdc_country_functional_desc =
2015 (struct usb_cdc_country_functional_desc *)buffer;
2016 break;
2017 case USB_CDC_HEADER_TYPE:
2018 if (elength != sizeof(struct usb_cdc_header_desc))
2019 goto next_desc;
2020 if (header)
2021 return -EINVAL;
2022 header = (struct usb_cdc_header_desc *)buffer;
2023 break;
2024 case USB_CDC_ACM_TYPE:
2025 if (elength < sizeof(struct usb_cdc_acm_descriptor))
2026 goto next_desc;
2027 hdr->usb_cdc_acm_descriptor =
2028 (struct usb_cdc_acm_descriptor *)buffer;
2029 break;
2030 case USB_CDC_ETHERNET_TYPE:
2031 if (elength != sizeof(struct usb_cdc_ether_desc))
2032 goto next_desc;
2033 if (ether)
2034 return -EINVAL;
2035 ether = (struct usb_cdc_ether_desc *)buffer;
2036 break;
2037 case USB_CDC_CALL_MANAGEMENT_TYPE:
2038 if (elength < sizeof(struct usb_cdc_call_mgmt_descriptor))
2039 goto next_desc;
2040 hdr->usb_cdc_call_mgmt_descriptor =
2041 (struct usb_cdc_call_mgmt_descriptor *)buffer;
2042 break;
2043 case USB_CDC_DMM_TYPE:
2044 if (elength < sizeof(struct usb_cdc_dmm_desc))
2045 goto next_desc;
2046 hdr->usb_cdc_dmm_desc =
2047 (struct usb_cdc_dmm_desc *)buffer;
2048 break;
2049 case USB_CDC_MDLM_TYPE:
2050 if (elength < sizeof(struct usb_cdc_mdlm_desc *))
2051 goto next_desc;
2052 if (desc)
2053 return -EINVAL;
2054 desc = (struct usb_cdc_mdlm_desc *)buffer;
2055 break;
2056 case USB_CDC_MDLM_DETAIL_TYPE:
2057 if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *))
2058 goto next_desc;
2059 if (detail)
2060 return -EINVAL;
2061 detail = (struct usb_cdc_mdlm_detail_desc *)buffer;
2062 break;
2063 case USB_CDC_NCM_TYPE:
2064 if (elength < sizeof(struct usb_cdc_ncm_desc))
2065 goto next_desc;
2066 hdr->usb_cdc_ncm_desc = (struct usb_cdc_ncm_desc *)buffer;
2067 break;
2068 case USB_CDC_MBIM_TYPE:
2069 if (elength < sizeof(struct usb_cdc_mbim_desc))
2070 goto next_desc;
2071
2072 hdr->usb_cdc_mbim_desc = (struct usb_cdc_mbim_desc *)buffer;
2073 break;
2074 case USB_CDC_MBIM_EXTENDED_TYPE:
2075 if (elength < sizeof(struct usb_cdc_mbim_extended_desc))
2076 break;
2077 hdr->usb_cdc_mbim_extended_desc =
2078 (struct usb_cdc_mbim_extended_desc *)buffer;
2079 break;
2080 case CDC_PHONET_MAGIC_NUMBER:
2081 hdr->phonet_magic_present = true;
2082 break;
2083 default:
2084 /*
2085 * there are LOTS more CDC descriptors that
2086 * could legitimately be found here.
2087 */
2088 dev_dbg(&intf->dev, "Ignoring descriptor: type %02x, length %ud\n",
2089 buffer[2], elength);
2090 goto next_desc;
2091 }
2092 cnt++;
2093 next_desc:
2094 buflen -= elength;
2095 buffer += elength;
2096 }
2097 hdr->usb_cdc_union_desc = union_header;
2098 hdr->usb_cdc_header_desc = header;
2099 hdr->usb_cdc_mdlm_detail_desc = detail;
2100 hdr->usb_cdc_mdlm_desc = desc;
2101 hdr->usb_cdc_ether_desc = ether;
2102 return cnt;
2103 }
2104
2105 EXPORT_SYMBOL(cdc_parse_cdc_header);
2106
2107 /*
2108 * The function can't be called inside suspend/resume callback,
2109 * otherwise deadlock will be caused.
2110 */
2111 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2112 u16 value, u16 index, void *data, u16 size)
2113 {
2114 int ret;
2115
2116 if (usb_autopm_get_interface(dev->intf) < 0)
2117 return -ENODEV;
2118 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2119 data, size);
2120 usb_autopm_put_interface(dev->intf);
2121 return ret;
2122 }
2123 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2124
2125 /*
2126 * The function can't be called inside suspend/resume callback,
2127 * otherwise deadlock will be caused.
2128 */
2129 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2130 u16 value, u16 index, const void *data, u16 size)
2131 {
2132 int ret;
2133
2134 if (usb_autopm_get_interface(dev->intf) < 0)
2135 return -ENODEV;
2136 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2137 data, size);
2138 usb_autopm_put_interface(dev->intf);
2139 return ret;
2140 }
2141 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2142
2143 /*
2144 * The function can be called inside suspend/resume callback safely
2145 * and should only be called by suspend/resume callback generally.
2146 */
2147 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2148 u16 value, u16 index, void *data, u16 size)
2149 {
2150 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2151 data, size);
2152 }
2153 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2154
2155 /*
2156 * The function can be called inside suspend/resume callback safely
2157 * and should only be called by suspend/resume callback generally.
2158 */
2159 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2160 u16 value, u16 index, const void *data,
2161 u16 size)
2162 {
2163 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2164 data, size);
2165 }
2166 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2167
2168 static void usbnet_async_cmd_cb(struct urb *urb)
2169 {
2170 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2171 int status = urb->status;
2172
2173 if (status < 0)
2174 dev_dbg(&urb->dev->dev, "%s failed with %d",
2175 __func__, status);
2176
2177 kfree(req);
2178 usb_free_urb(urb);
2179 }
2180
2181 /*
2182 * The caller must make sure that device can't be put into suspend
2183 * state until the control URB completes.
2184 */
2185 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2186 u16 value, u16 index, const void *data, u16 size)
2187 {
2188 struct usb_ctrlrequest *req = NULL;
2189 struct urb *urb;
2190 int err = -ENOMEM;
2191 void *buf = NULL;
2192
2193 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2194 " value=0x%04x index=0x%04x size=%d\n",
2195 cmd, reqtype, value, index, size);
2196
2197 urb = usb_alloc_urb(0, GFP_ATOMIC);
2198 if (!urb) {
2199 netdev_err(dev->net, "Error allocating URB in"
2200 " %s!\n", __func__);
2201 goto fail;
2202 }
2203
2204 if (data) {
2205 buf = kmemdup(data, size, GFP_ATOMIC);
2206 if (!buf) {
2207 netdev_err(dev->net, "Error allocating buffer"
2208 " in %s!\n", __func__);
2209 goto fail_free;
2210 }
2211 }
2212
2213 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2214 if (!req)
2215 goto fail_free_buf;
2216
2217 req->bRequestType = reqtype;
2218 req->bRequest = cmd;
2219 req->wValue = cpu_to_le16(value);
2220 req->wIndex = cpu_to_le16(index);
2221 req->wLength = cpu_to_le16(size);
2222
2223 usb_fill_control_urb(urb, dev->udev,
2224 usb_sndctrlpipe(dev->udev, 0),
2225 (void *)req, buf, size,
2226 usbnet_async_cmd_cb, req);
2227 urb->transfer_flags |= URB_FREE_BUFFER;
2228
2229 err = usb_submit_urb(urb, GFP_ATOMIC);
2230 if (err < 0) {
2231 netdev_err(dev->net, "Error submitting the control"
2232 " message: status=%d\n", err);
2233 goto fail_free;
2234 }
2235 return 0;
2236
2237 fail_free_buf:
2238 kfree(buf);
2239 fail_free:
2240 kfree(req);
2241 usb_free_urb(urb);
2242 fail:
2243 return err;
2244
2245 }
2246 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2247 /*-------------------------------------------------------------------------*/
2248
2249 static int __init usbnet_init(void)
2250 {
2251 /* Compiler should optimize this out. */
2252 BUILD_BUG_ON(
2253 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2254
2255 eth_random_addr(node_id);
2256 return 0;
2257 }
2258 module_init(usbnet_init);
2259
2260 static void __exit usbnet_exit(void)
2261 {
2262 }
2263 module_exit(usbnet_exit);
2264
2265 MODULE_AUTHOR("David Brownell");
2266 MODULE_DESCRIPTION("USB network driver framework");
2267 MODULE_LICENSE("GPL");
CRIS linux kernel tree