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Merge tag 'regmap-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / net / usb / usbnet.c
blobd5071e364d40e1dba629a887d67a07c4ff66825c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
24 *
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
31
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/slab.h>
46 #include <linux/kernel.h>
47 #include <linux/pm_runtime.h>
48
49 #define DRIVER_VERSION "22-Aug-2005"
50
51
52 /*-------------------------------------------------------------------------*/
53
54 /*
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
60 *
61 * The goal is to let the USB host controller be busy for 5msec or
62 * more before an irq is required, under load. Jumbograms change
63 * the equation.
64 */
65 #define MAX_QUEUE_MEMORY (60 * 1518)
66 #define RX_QLEN(dev) ((dev)->rx_qlen)
67 #define TX_QLEN(dev) ((dev)->tx_qlen)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
73 * us (it polls at HZ/4 usually) before we report too many false errors.
74 */
75 #define THROTTLE_JIFFIES (HZ/8)
76
77 // between wakeups
78 #define UNLINK_TIMEOUT_MS 3
79
80 /*-------------------------------------------------------------------------*/
81
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
84
85 static const char driver_name [] = "usbnet";
86
87 /* use ethtool to change the level for any given device */
88 static int msg_level = -1;
89 module_param (msg_level, int, 0);
90 MODULE_PARM_DESC (msg_level, "Override default message level");
91
92 /*-------------------------------------------------------------------------*/
93
94 /* handles CDC Ethernet and many other network "bulk data" interfaces */
95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96 {
97 int tmp;
98 struct usb_host_interface *alt = NULL;
99 struct usb_host_endpoint *in = NULL, *out = NULL;
100 struct usb_host_endpoint *status = NULL;
101
102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 unsigned ep;
104
105 in = out = status = NULL;
106 alt = intf->altsetting + tmp;
107
108 /* take the first altsetting with in-bulk + out-bulk;
109 * remember any status endpoint, just in case;
110 * ignore other endpoints and altsettings.
111 */
112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
113 struct usb_host_endpoint *e;
114 int intr = 0;
115
116 e = alt->endpoint + ep;
117 switch (e->desc.bmAttributes) {
118 case USB_ENDPOINT_XFER_INT:
119 if (!usb_endpoint_dir_in(&e->desc))
120 continue;
121 intr = 1;
122 /* FALLTHROUGH */
123 case USB_ENDPOINT_XFER_BULK:
124 break;
125 default:
126 continue;
127 }
128 if (usb_endpoint_dir_in(&e->desc)) {
129 if (!intr && !in)
130 in = e;
131 else if (intr && !status)
132 status = e;
133 } else {
134 if (!out)
135 out = e;
136 }
137 }
138 if (in && out)
139 break;
140 }
141 if (!alt || !in || !out)
142 return -EINVAL;
143
144 if (alt->desc.bAlternateSetting != 0 ||
145 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
147 alt->desc.bAlternateSetting);
148 if (tmp < 0)
149 return tmp;
150 }
151
152 dev->in = usb_rcvbulkpipe (dev->udev,
153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->out = usb_sndbulkpipe (dev->udev,
155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->status = status;
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
160
161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
162 {
163 int tmp = -1, ret;
164 unsigned char buf [13];
165
166 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
167 if (ret == 12)
168 tmp = hex2bin(dev->net->dev_addr, buf, 6);
169 if (tmp < 0) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (ret >= 0)
173 ret = -EINVAL;
174 return ret;
175 }
176 return 0;
177 }
178 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
179
180 static void intr_complete (struct urb *urb)
181 {
182 struct usbnet *dev = urb->context;
183 int status = urb->status;
184
185 switch (status) {
186 /* success */
187 case 0:
188 dev->driver_info->status(dev, urb);
189 break;
190
191 /* software-driven interface shutdown */
192 case -ENOENT: /* urb killed */
193 case -ESHUTDOWN: /* hardware gone */
194 netif_dbg(dev, ifdown, dev->net,
195 "intr shutdown, code %d\n", status);
196 return;
197
198 /* NOTE: not throttling like RX/TX, since this endpoint
199 * already polls infrequently
200 */
201 default:
202 netdev_dbg(dev->net, "intr status %d\n", status);
203 break;
204 }
205
206 status = usb_submit_urb (urb, GFP_ATOMIC);
207 if (status != 0)
208 netif_err(dev, timer, dev->net,
209 "intr resubmit --> %d\n", status);
210 }
211
212 static int init_status (struct usbnet *dev, struct usb_interface *intf)
213 {
214 char *buf = NULL;
215 unsigned pipe = 0;
216 unsigned maxp;
217 unsigned period;
218
219 if (!dev->driver_info->status)
220 return 0;
221
222 pipe = usb_rcvintpipe (dev->udev,
223 dev->status->desc.bEndpointAddress
224 & USB_ENDPOINT_NUMBER_MASK);
225 maxp = usb_maxpacket (dev->udev, pipe, 0);
226
227 /* avoid 1 msec chatter: min 8 msec poll rate */
228 period = max ((int) dev->status->desc.bInterval,
229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
230
231 buf = kmalloc (maxp, GFP_KERNEL);
232 if (buf) {
233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
234 if (!dev->interrupt) {
235 kfree (buf);
236 return -ENOMEM;
237 } else {
238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
239 buf, maxp, intr_complete, dev, period);
240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
241 dev_dbg(&intf->dev,
242 "status ep%din, %d bytes period %d\n",
243 usb_pipeendpoint(pipe), maxp, period);
244 }
245 }
246 return 0;
247 }
248
249 /* Submit the interrupt URB if not previously submitted, increasing refcount */
250 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
251 {
252 int ret = 0;
253
254 WARN_ON_ONCE(dev->interrupt == NULL);
255 if (dev->interrupt) {
256 mutex_lock(&dev->interrupt_mutex);
257
258 if (++dev->interrupt_count == 1)
259 ret = usb_submit_urb(dev->interrupt, mem_flags);
260
261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
262 dev->interrupt_count);
263 mutex_unlock(&dev->interrupt_mutex);
264 }
265 return ret;
266 }
267 EXPORT_SYMBOL_GPL(usbnet_status_start);
268
269 /* For resume; submit interrupt URB if previously submitted */
270 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
271 {
272 int ret = 0;
273
274 mutex_lock(&dev->interrupt_mutex);
275 if (dev->interrupt_count) {
276 ret = usb_submit_urb(dev->interrupt, mem_flags);
277 dev_dbg(&dev->udev->dev,
278 "submitted interrupt URB for resume\n");
279 }
280 mutex_unlock(&dev->interrupt_mutex);
281 return ret;
282 }
283
284 /* Kill the interrupt URB if all submitters want it killed */
285 void usbnet_status_stop(struct usbnet *dev)
286 {
287 if (dev->interrupt) {
288 mutex_lock(&dev->interrupt_mutex);
289 WARN_ON(dev->interrupt_count == 0);
290
291 if (dev->interrupt_count && --dev->interrupt_count == 0)
292 usb_kill_urb(dev->interrupt);
293
294 dev_dbg(&dev->udev->dev,
295 "decremented interrupt URB count to %d\n",
296 dev->interrupt_count);
297 mutex_unlock(&dev->interrupt_mutex);
298 }
299 }
300 EXPORT_SYMBOL_GPL(usbnet_status_stop);
301
302 /* For suspend; always kill interrupt URB */
303 static void __usbnet_status_stop_force(struct usbnet *dev)
304 {
305 if (dev->interrupt) {
306 mutex_lock(&dev->interrupt_mutex);
307 usb_kill_urb(dev->interrupt);
308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
309 mutex_unlock(&dev->interrupt_mutex);
310 }
311 }
312
313 /* Passes this packet up the stack, updating its accounting.
314 * Some link protocols batch packets, so their rx_fixup paths
315 * can return clones as well as just modify the original skb.
316 */
317 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
318 {
319 int status;
320
321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
322 skb_queue_tail(&dev->rxq_pause, skb);
323 return;
324 }
325
326 /* only update if unset to allow minidriver rx_fixup override */
327 if (skb->protocol == 0)
328 skb->protocol = eth_type_trans (skb, dev->net);
329
330 dev->net->stats.rx_packets++;
331 dev->net->stats.rx_bytes += skb->len;
332
333 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
334 skb->len + sizeof (struct ethhdr), skb->protocol);
335 memset (skb->cb, 0, sizeof (struct skb_data));
336
337 if (skb_defer_rx_timestamp(skb))
338 return;
339
340 status = netif_rx (skb);
341 if (status != NET_RX_SUCCESS)
342 netif_dbg(dev, rx_err, dev->net,
343 "netif_rx status %d\n", status);
344 }
345 EXPORT_SYMBOL_GPL(usbnet_skb_return);
346
347 /* must be called if hard_mtu or rx_urb_size changed */
348 void usbnet_update_max_qlen(struct usbnet *dev)
349 {
350 enum usb_device_speed speed = dev->udev->speed;
351
352 switch (speed) {
353 case USB_SPEED_HIGH:
354 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
355 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
356 break;
357 case USB_SPEED_SUPER:
358 case USB_SPEED_SUPER_PLUS:
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_pause_rx(dev);
399 usbnet_unlink_rx_urbs(dev);
400 usbnet_resume_rx(dev);
401 }
402 }
403
404 /* max qlen depend on hard_mtu and rx_urb_size */
405 usbnet_update_max_qlen(dev);
406
407 return 0;
408 }
409 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
410
411 /* The caller must hold list->lock */
412 static void __usbnet_queue_skb(struct sk_buff_head *list,
413 struct sk_buff *newsk, enum skb_state state)
414 {
415 struct skb_data *entry = (struct skb_data *) newsk->cb;
416
417 __skb_queue_tail(list, newsk);
418 entry->state = state;
419 }
420
421 /*-------------------------------------------------------------------------*/
422
423 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
424 * completion callbacks. 2.5 should have fixed those bugs...
425 */
426
427 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
428 struct sk_buff_head *list, enum skb_state state)
429 {
430 unsigned long flags;
431 enum skb_state old_state;
432 struct skb_data *entry = (struct skb_data *) skb->cb;
433
434 spin_lock_irqsave(&list->lock, flags);
435 old_state = entry->state;
436 entry->state = state;
437 __skb_unlink(skb, list);
438
439 /* defer_bh() is never called with list == &dev->done.
440 * spin_lock_nested() tells lockdep that it is OK to take
441 * dev->done.lock here with list->lock held.
442 */
443 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
444
445 __skb_queue_tail(&dev->done, skb);
446 if (dev->done.qlen == 1)
447 tasklet_schedule(&dev->bh);
448 spin_unlock(&dev->done.lock);
449 spin_unlock_irqrestore(&list->lock, flags);
450 return old_state;
451 }
452
453 /* some work can't be done in tasklets, so we use keventd
454 *
455 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
456 * but tasklet_schedule() doesn't. hope the failure is rare.
457 */
458 void usbnet_defer_kevent (struct usbnet *dev, int work)
459 {
460 set_bit (work, &dev->flags);
461 if (!schedule_work (&dev->kevent)) {
462 if (net_ratelimit())
463 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
464 } else {
465 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
466 }
467 }
468 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
469
470 /*-------------------------------------------------------------------------*/
471
472 static void rx_complete (struct urb *urb);
473
474 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
475 {
476 struct sk_buff *skb;
477 struct skb_data *entry;
478 int retval = 0;
479 unsigned long lockflags;
480 size_t size = dev->rx_urb_size;
481
482 /* prevent rx skb allocation when error ratio is high */
483 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
484 usb_free_urb(urb);
485 return -ENOLINK;
486 }
487
488 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
489 if (!skb) {
490 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
491 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
492 usb_free_urb (urb);
493 return -ENOMEM;
494 }
495
496 entry = (struct skb_data *) skb->cb;
497 entry->urb = urb;
498 entry->dev = dev;
499 entry->length = 0;
500
501 usb_fill_bulk_urb (urb, dev->udev, dev->in,
502 skb->data, size, rx_complete, skb);
503
504 spin_lock_irqsave (&dev->rxq.lock, lockflags);
505
506 if (netif_running (dev->net) &&
507 netif_device_present (dev->net) &&
508 !test_bit (EVENT_RX_HALT, &dev->flags) &&
509 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
510 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
511 case -EPIPE:
512 usbnet_defer_kevent (dev, EVENT_RX_HALT);
513 break;
514 case -ENOMEM:
515 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
516 break;
517 case -ENODEV:
518 netif_dbg(dev, ifdown, dev->net, "device gone\n");
519 netif_device_detach (dev->net);
520 break;
521 case -EHOSTUNREACH:
522 retval = -ENOLINK;
523 break;
524 default:
525 netif_dbg(dev, rx_err, dev->net,
526 "rx submit, %d\n", retval);
527 tasklet_schedule (&dev->bh);
528 break;
529 case 0:
530 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
531 }
532 } else {
533 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
534 retval = -ENOLINK;
535 }
536 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
537 if (retval) {
538 dev_kfree_skb_any (skb);
539 usb_free_urb (urb);
540 }
541 return retval;
542 }
543
544
545 /*-------------------------------------------------------------------------*/
546
547 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
548 {
549 if (dev->driver_info->rx_fixup &&
550 !dev->driver_info->rx_fixup (dev, skb)) {
551 /* With RX_ASSEMBLE, rx_fixup() must update counters */
552 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
553 dev->net->stats.rx_errors++;
554 goto done;
555 }
556 // else network stack removes extra byte if we forced a short packet
557
558 /* all data was already cloned from skb inside the driver */
559 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
560 goto done;
561
562 if (skb->len < ETH_HLEN) {
563 dev->net->stats.rx_errors++;
564 dev->net->stats.rx_length_errors++;
565 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
566 } else {
567 usbnet_skb_return(dev, skb);
568 return;
569 }
570
571 done:
572 skb_queue_tail(&dev->done, skb);
573 }
574
575 /*-------------------------------------------------------------------------*/
576
577 static void rx_complete (struct urb *urb)
578 {
579 struct sk_buff *skb = (struct sk_buff *) urb->context;
580 struct skb_data *entry = (struct skb_data *) skb->cb;
581 struct usbnet *dev = entry->dev;
582 int urb_status = urb->status;
583 enum skb_state state;
584
585 skb_put (skb, urb->actual_length);
586 state = rx_done;
587 entry->urb = NULL;
588
589 switch (urb_status) {
590 /* success */
591 case 0:
592 break;
593
594 /* stalls need manual reset. this is rare ... except that
595 * when going through USB 2.0 TTs, unplug appears this way.
596 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
597 * storm, recovering as needed.
598 */
599 case -EPIPE:
600 dev->net->stats.rx_errors++;
601 usbnet_defer_kevent (dev, EVENT_RX_HALT);
602 // FALLTHROUGH
603
604 /* software-driven interface shutdown */
605 case -ECONNRESET: /* async unlink */
606 case -ESHUTDOWN: /* hardware gone */
607 netif_dbg(dev, ifdown, dev->net,
608 "rx shutdown, code %d\n", urb_status);
609 goto block;
610
611 /* we get controller i/o faults during hub_wq disconnect() delays.
612 * throttle down resubmits, to avoid log floods; just temporarily,
613 * so we still recover when the fault isn't a hub_wq delay.
614 */
615 case -EPROTO:
616 case -ETIME:
617 case -EILSEQ:
618 dev->net->stats.rx_errors++;
619 if (!timer_pending (&dev->delay)) {
620 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
621 netif_dbg(dev, link, dev->net,
622 "rx throttle %d\n", urb_status);
623 }
624 block:
625 state = rx_cleanup;
626 entry->urb = urb;
627 urb = NULL;
628 break;
629
630 /* data overrun ... flush fifo? */
631 case -EOVERFLOW:
632 dev->net->stats.rx_over_errors++;
633 // FALLTHROUGH
634
635 default:
636 state = rx_cleanup;
637 dev->net->stats.rx_errors++;
638 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
639 break;
640 }
641
642 /* stop rx if packet error rate is high */
643 if (++dev->pkt_cnt > 30) {
644 dev->pkt_cnt = 0;
645 dev->pkt_err = 0;
646 } else {
647 if (state == rx_cleanup)
648 dev->pkt_err++;
649 if (dev->pkt_err > 20)
650 set_bit(EVENT_RX_KILL, &dev->flags);
651 }
652
653 state = defer_bh(dev, skb, &dev->rxq, state);
654
655 if (urb) {
656 if (netif_running (dev->net) &&
657 !test_bit (EVENT_RX_HALT, &dev->flags) &&
658 state != unlink_start) {
659 rx_submit (dev, urb, GFP_ATOMIC);
660 usb_mark_last_busy(dev->udev);
661 return;
662 }
663 usb_free_urb (urb);
664 }
665 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
666 }
667
668 /*-------------------------------------------------------------------------*/
669 void usbnet_pause_rx(struct usbnet *dev)
670 {
671 set_bit(EVENT_RX_PAUSED, &dev->flags);
672
673 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
674 }
675 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
676
677 void usbnet_resume_rx(struct usbnet *dev)
678 {
679 struct sk_buff *skb;
680 int num = 0;
681
682 clear_bit(EVENT_RX_PAUSED, &dev->flags);
683
684 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
685 usbnet_skb_return(dev, skb);
686 num++;
687 }
688
689 tasklet_schedule(&dev->bh);
690
691 netif_dbg(dev, rx_status, dev->net,
692 "paused rx queue disabled, %d skbs requeued\n", num);
693 }
694 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
695
696 void usbnet_purge_paused_rxq(struct usbnet *dev)
697 {
698 skb_queue_purge(&dev->rxq_pause);
699 }
700 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
701
702 /*-------------------------------------------------------------------------*/
703
704 // unlink pending rx/tx; completion handlers do all other cleanup
705
706 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
707 {
708 unsigned long flags;
709 struct sk_buff *skb;
710 int count = 0;
711
712 spin_lock_irqsave (&q->lock, flags);
713 while (!skb_queue_empty(q)) {
714 struct skb_data *entry;
715 struct urb *urb;
716 int retval;
717
718 skb_queue_walk(q, skb) {
719 entry = (struct skb_data *) skb->cb;
720 if (entry->state != unlink_start)
721 goto found;
722 }
723 break;
724 found:
725 entry->state = unlink_start;
726 urb = entry->urb;
727
728 /*
729 * Get reference count of the URB to avoid it to be
730 * freed during usb_unlink_urb, which may trigger
731 * use-after-free problem inside usb_unlink_urb since
732 * usb_unlink_urb is always racing with .complete
733 * handler(include defer_bh).
734 */
735 usb_get_urb(urb);
736 spin_unlock_irqrestore(&q->lock, flags);
737 // during some PM-driven resume scenarios,
738 // these (async) unlinks complete immediately
739 retval = usb_unlink_urb (urb);
740 if (retval != -EINPROGRESS && retval != 0)
741 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
742 else
743 count++;
744 usb_put_urb(urb);
745 spin_lock_irqsave(&q->lock, flags);
746 }
747 spin_unlock_irqrestore (&q->lock, flags);
748 return count;
749 }
750
751 // Flush all pending rx urbs
752 // minidrivers may need to do this when the MTU changes
753
754 void usbnet_unlink_rx_urbs(struct usbnet *dev)
755 {
756 if (netif_running(dev->net)) {
757 (void) unlink_urbs (dev, &dev->rxq);
758 tasklet_schedule(&dev->bh);
759 }
760 }
761 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
762
763 /*-------------------------------------------------------------------------*/
764
765 static void wait_skb_queue_empty(struct sk_buff_head *q)
766 {
767 unsigned long flags;
768
769 spin_lock_irqsave(&q->lock, flags);
770 while (!skb_queue_empty(q)) {
771 spin_unlock_irqrestore(&q->lock, flags);
772 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
773 set_current_state(TASK_UNINTERRUPTIBLE);
774 spin_lock_irqsave(&q->lock, flags);
775 }
776 spin_unlock_irqrestore(&q->lock, flags);
777 }
778
779 // precondition: never called in_interrupt
780 static void usbnet_terminate_urbs(struct usbnet *dev)
781 {
782 DECLARE_WAITQUEUE(wait, current);
783 int temp;
784
785 /* ensure there are no more active urbs */
786 add_wait_queue(&dev->wait, &wait);
787 set_current_state(TASK_UNINTERRUPTIBLE);
788 temp = unlink_urbs(dev, &dev->txq) +
789 unlink_urbs(dev, &dev->rxq);
790
791 /* maybe wait for deletions to finish. */
792 wait_skb_queue_empty(&dev->rxq);
793 wait_skb_queue_empty(&dev->txq);
794 wait_skb_queue_empty(&dev->done);
795 netif_dbg(dev, ifdown, dev->net,
796 "waited for %d urb completions\n", temp);
797 set_current_state(TASK_RUNNING);
798 remove_wait_queue(&dev->wait, &wait);
799 }
800
801 int usbnet_stop (struct net_device *net)
802 {
803 struct usbnet *dev = netdev_priv(net);
804 struct driver_info *info = dev->driver_info;
805 int retval, pm, mpn;
806
807 clear_bit(EVENT_DEV_OPEN, &dev->flags);
808 netif_stop_queue (net);
809
810 netif_info(dev, ifdown, dev->net,
811 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
812 net->stats.rx_packets, net->stats.tx_packets,
813 net->stats.rx_errors, net->stats.tx_errors);
814
815 /* to not race resume */
816 pm = usb_autopm_get_interface(dev->intf);
817 /* allow minidriver to stop correctly (wireless devices to turn off
818 * radio etc) */
819 if (info->stop) {
820 retval = info->stop(dev);
821 if (retval < 0)
822 netif_info(dev, ifdown, dev->net,
823 "stop fail (%d) usbnet usb-%s-%s, %s\n",
824 retval,
825 dev->udev->bus->bus_name, dev->udev->devpath,
826 info->description);
827 }
828
829 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
830 usbnet_terminate_urbs(dev);
831
832 usbnet_status_stop(dev);
833
834 usbnet_purge_paused_rxq(dev);
835
836 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
837
838 /* deferred work (task, timer, softirq) must also stop.
839 * can't flush_scheduled_work() until we drop rtnl (later),
840 * else workers could deadlock; so make workers a NOP.
841 */
842 dev->flags = 0;
843 del_timer_sync (&dev->delay);
844 tasklet_kill (&dev->bh);
845 if (!pm)
846 usb_autopm_put_interface(dev->intf);
847
848 if (info->manage_power && mpn)
849 info->manage_power(dev, 0);
850 else
851 usb_autopm_put_interface(dev->intf);
852
853 return 0;
854 }
855 EXPORT_SYMBOL_GPL(usbnet_stop);
856
857 /*-------------------------------------------------------------------------*/
858
859 // posts reads, and enables write queuing
860
861 // precondition: never called in_interrupt
862
863 int usbnet_open (struct net_device *net)
864 {
865 struct usbnet *dev = netdev_priv(net);
866 int retval;
867 struct driver_info *info = dev->driver_info;
868
869 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
870 netif_info(dev, ifup, dev->net,
871 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
872 retval,
873 dev->udev->bus->bus_name,
874 dev->udev->devpath,
875 info->description);
876 goto done_nopm;
877 }
878
879 // put into "known safe" state
880 if (info->reset && (retval = info->reset (dev)) < 0) {
881 netif_info(dev, ifup, dev->net,
882 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
883 retval,
884 dev->udev->bus->bus_name,
885 dev->udev->devpath,
886 info->description);
887 goto done;
888 }
889
890 /* hard_mtu or rx_urb_size may change in reset() */
891 usbnet_update_max_qlen(dev);
892
893 // insist peer be connected
894 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
895 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
896 goto done;
897 }
898
899 /* start any status interrupt transfer */
900 if (dev->interrupt) {
901 retval = usbnet_status_start(dev, GFP_KERNEL);
902 if (retval < 0) {
903 netif_err(dev, ifup, dev->net,
904 "intr submit %d\n", retval);
905 goto done;
906 }
907 }
908
909 set_bit(EVENT_DEV_OPEN, &dev->flags);
910 netif_start_queue (net);
911 netif_info(dev, ifup, dev->net,
912 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
913 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
914 dev->net->mtu,
915 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
916 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
917 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
918 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
919 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
920 "simple");
921
922 /* reset rx error state */
923 dev->pkt_cnt = 0;
924 dev->pkt_err = 0;
925 clear_bit(EVENT_RX_KILL, &dev->flags);
926
927 // delay posting reads until we're fully open
928 tasklet_schedule (&dev->bh);
929 if (info->manage_power) {
930 retval = info->manage_power(dev, 1);
931 if (retval < 0) {
932 retval = 0;
933 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
934 } else {
935 usb_autopm_put_interface(dev->intf);
936 }
937 }
938 return retval;
939 done:
940 usb_autopm_put_interface(dev->intf);
941 done_nopm:
942 return retval;
943 }
944 EXPORT_SYMBOL_GPL(usbnet_open);
945
946 /*-------------------------------------------------------------------------*/
947
948 /* ethtool methods; minidrivers may need to add some more, but
949 * they'll probably want to use this base set.
950 */
951
952 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
953 {
954 struct usbnet *dev = netdev_priv(net);
955
956 if (!dev->mii.mdio_read)
957 return -EOPNOTSUPP;
958
959 return mii_ethtool_gset(&dev->mii, cmd);
960 }
961 EXPORT_SYMBOL_GPL(usbnet_get_settings);
962
963 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
964 {
965 struct usbnet *dev = netdev_priv(net);
966 int retval;
967
968 if (!dev->mii.mdio_write)
969 return -EOPNOTSUPP;
970
971 retval = mii_ethtool_sset(&dev->mii, cmd);
972
973 /* link speed/duplex might have changed */
974 if (dev->driver_info->link_reset)
975 dev->driver_info->link_reset(dev);
976
977 /* hard_mtu or rx_urb_size may change in link_reset() */
978 usbnet_update_max_qlen(dev);
979
980 return retval;
981
982 }
983 EXPORT_SYMBOL_GPL(usbnet_set_settings);
984
985 u32 usbnet_get_link (struct net_device *net)
986 {
987 struct usbnet *dev = netdev_priv(net);
988
989 /* If a check_connect is defined, return its result */
990 if (dev->driver_info->check_connect)
991 return dev->driver_info->check_connect (dev) == 0;
992
993 /* if the device has mii operations, use those */
994 if (dev->mii.mdio_read)
995 return mii_link_ok(&dev->mii);
996
997 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
998 return ethtool_op_get_link(net);
999 }
1000 EXPORT_SYMBOL_GPL(usbnet_get_link);
1001
1002 int usbnet_nway_reset(struct net_device *net)
1003 {
1004 struct usbnet *dev = netdev_priv(net);
1005
1006 if (!dev->mii.mdio_write)
1007 return -EOPNOTSUPP;
1008
1009 return mii_nway_restart(&dev->mii);
1010 }
1011 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1012
1013 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1014 {
1015 struct usbnet *dev = netdev_priv(net);
1016
1017 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1018 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1019 strlcpy (info->fw_version, dev->driver_info->description,
1020 sizeof info->fw_version);
1021 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1022 }
1023 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1024
1025 u32 usbnet_get_msglevel (struct net_device *net)
1026 {
1027 struct usbnet *dev = netdev_priv(net);
1028
1029 return dev->msg_enable;
1030 }
1031 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1032
1033 void usbnet_set_msglevel (struct net_device *net, u32 level)
1034 {
1035 struct usbnet *dev = netdev_priv(net);
1036
1037 dev->msg_enable = level;
1038 }
1039 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1040
1041 /* drivers may override default ethtool_ops in their bind() routine */
1042 static const struct ethtool_ops usbnet_ethtool_ops = {
1043 .get_settings = usbnet_get_settings,
1044 .set_settings = usbnet_set_settings,
1045 .get_link = usbnet_get_link,
1046 .nway_reset = usbnet_nway_reset,
1047 .get_drvinfo = usbnet_get_drvinfo,
1048 .get_msglevel = usbnet_get_msglevel,
1049 .set_msglevel = usbnet_set_msglevel,
1050 .get_ts_info = ethtool_op_get_ts_info,
1051 };
1052
1053 /*-------------------------------------------------------------------------*/
1054
1055 static void __handle_link_change(struct usbnet *dev)
1056 {
1057 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1058 return;
1059
1060 if (!netif_carrier_ok(dev->net)) {
1061 /* kill URBs for reading packets to save bus bandwidth */
1062 unlink_urbs(dev, &dev->rxq);
1063
1064 /*
1065 * tx_timeout will unlink URBs for sending packets and
1066 * tx queue is stopped by netcore after link becomes off
1067 */
1068 } else {
1069 /* submitting URBs for reading packets */
1070 tasklet_schedule(&dev->bh);
1071 }
1072
1073 /* hard_mtu or rx_urb_size may change during link change */
1074 usbnet_update_max_qlen(dev);
1075
1076 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1077 }
1078
1079 static void usbnet_set_rx_mode(struct net_device *net)
1080 {
1081 struct usbnet *dev = netdev_priv(net);
1082
1083 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1084 }
1085
1086 static void __handle_set_rx_mode(struct usbnet *dev)
1087 {
1088 if (dev->driver_info->set_rx_mode)
1089 (dev->driver_info->set_rx_mode)(dev);
1090
1091 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1092 }
1093
1094 /* work that cannot be done in interrupt context uses keventd.
1095 *
1096 * NOTE: with 2.5 we could do more of this using completion callbacks,
1097 * especially now that control transfers can be queued.
1098 */
1099 static void
1100 usbnet_deferred_kevent (struct work_struct *work)
1101 {
1102 struct usbnet *dev =
1103 container_of(work, struct usbnet, kevent);
1104 int status;
1105
1106 /* usb_clear_halt() needs a thread context */
1107 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1108 unlink_urbs (dev, &dev->txq);
1109 status = usb_autopm_get_interface(dev->intf);
1110 if (status < 0)
1111 goto fail_pipe;
1112 status = usb_clear_halt (dev->udev, dev->out);
1113 usb_autopm_put_interface(dev->intf);
1114 if (status < 0 &&
1115 status != -EPIPE &&
1116 status != -ESHUTDOWN) {
1117 if (netif_msg_tx_err (dev))
1118 fail_pipe:
1119 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1120 status);
1121 } else {
1122 clear_bit (EVENT_TX_HALT, &dev->flags);
1123 if (status != -ESHUTDOWN)
1124 netif_wake_queue (dev->net);
1125 }
1126 }
1127 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1128 unlink_urbs (dev, &dev->rxq);
1129 status = usb_autopm_get_interface(dev->intf);
1130 if (status < 0)
1131 goto fail_halt;
1132 status = usb_clear_halt (dev->udev, dev->in);
1133 usb_autopm_put_interface(dev->intf);
1134 if (status < 0 &&
1135 status != -EPIPE &&
1136 status != -ESHUTDOWN) {
1137 if (netif_msg_rx_err (dev))
1138 fail_halt:
1139 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1140 status);
1141 } else {
1142 clear_bit (EVENT_RX_HALT, &dev->flags);
1143 tasklet_schedule (&dev->bh);
1144 }
1145 }
1146
1147 /* tasklet could resubmit itself forever if memory is tight */
1148 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1149 struct urb *urb = NULL;
1150 int resched = 1;
1151
1152 if (netif_running (dev->net))
1153 urb = usb_alloc_urb (0, GFP_KERNEL);
1154 else
1155 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1156 if (urb != NULL) {
1157 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1158 status = usb_autopm_get_interface(dev->intf);
1159 if (status < 0) {
1160 usb_free_urb(urb);
1161 goto fail_lowmem;
1162 }
1163 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1164 resched = 0;
1165 usb_autopm_put_interface(dev->intf);
1166 fail_lowmem:
1167 if (resched)
1168 tasklet_schedule (&dev->bh);
1169 }
1170 }
1171
1172 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1173 struct driver_info *info = dev->driver_info;
1174 int retval = 0;
1175
1176 clear_bit (EVENT_LINK_RESET, &dev->flags);
1177 status = usb_autopm_get_interface(dev->intf);
1178 if (status < 0)
1179 goto skip_reset;
1180 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1181 usb_autopm_put_interface(dev->intf);
1182 skip_reset:
1183 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1184 retval,
1185 dev->udev->bus->bus_name,
1186 dev->udev->devpath,
1187 info->description);
1188 } else {
1189 usb_autopm_put_interface(dev->intf);
1190 }
1191
1192 /* handle link change from link resetting */
1193 __handle_link_change(dev);
1194 }
1195
1196 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1197 __handle_link_change(dev);
1198
1199 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1200 __handle_set_rx_mode(dev);
1201
1202
1203 if (dev->flags)
1204 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1205 }
1206
1207 /*-------------------------------------------------------------------------*/
1208
1209 static void tx_complete (struct urb *urb)
1210 {
1211 struct sk_buff *skb = (struct sk_buff *) urb->context;
1212 struct skb_data *entry = (struct skb_data *) skb->cb;
1213 struct usbnet *dev = entry->dev;
1214
1215 if (urb->status == 0) {
1216 dev->net->stats.tx_packets += entry->packets;
1217 dev->net->stats.tx_bytes += entry->length;
1218 } else {
1219 dev->net->stats.tx_errors++;
1220
1221 switch (urb->status) {
1222 case -EPIPE:
1223 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1224 break;
1225
1226 /* software-driven interface shutdown */
1227 case -ECONNRESET: // async unlink
1228 case -ESHUTDOWN: // hardware gone
1229 break;
1230
1231 /* like rx, tx gets controller i/o faults during hub_wq
1232 * delays and so it uses the same throttling mechanism.
1233 */
1234 case -EPROTO:
1235 case -ETIME:
1236 case -EILSEQ:
1237 usb_mark_last_busy(dev->udev);
1238 if (!timer_pending (&dev->delay)) {
1239 mod_timer (&dev->delay,
1240 jiffies + THROTTLE_JIFFIES);
1241 netif_dbg(dev, link, dev->net,
1242 "tx throttle %d\n", urb->status);
1243 }
1244 netif_stop_queue (dev->net);
1245 break;
1246 default:
1247 netif_dbg(dev, tx_err, dev->net,
1248 "tx err %d\n", entry->urb->status);
1249 break;
1250 }
1251 }
1252
1253 usb_autopm_put_interface_async(dev->intf);
1254 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1255 }
1256
1257 /*-------------------------------------------------------------------------*/
1258
1259 void usbnet_tx_timeout (struct net_device *net)
1260 {
1261 struct usbnet *dev = netdev_priv(net);
1262
1263 unlink_urbs (dev, &dev->txq);
1264 tasklet_schedule (&dev->bh);
1265 /* this needs to be handled individually because the generic layer
1266 * doesn't know what is sufficient and could not restore private
1267 * information if a remedy of an unconditional reset were used.
1268 */
1269 if (dev->driver_info->recover)
1270 (dev->driver_info->recover)(dev);
1271 }
1272 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1273
1274 /*-------------------------------------------------------------------------*/
1275
1276 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1277 {
1278 unsigned num_sgs, total_len = 0;
1279 int i, s = 0;
1280
1281 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1282 if (num_sgs == 1)
1283 return 0;
1284
1285 /* reserve one for zero packet */
1286 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1287 GFP_ATOMIC);
1288 if (!urb->sg)
1289 return -ENOMEM;
1290
1291 urb->num_sgs = num_sgs;
1292 sg_init_table(urb->sg, urb->num_sgs + 1);
1293
1294 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1295 total_len += skb_headlen(skb);
1296
1297 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1298 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1299
1300 total_len += skb_frag_size(f);
1301 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1302 f->page_offset);
1303 }
1304 urb->transfer_buffer_length = total_len;
1305
1306 return 1;
1307 }
1308
1309 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1310 struct net_device *net)
1311 {
1312 struct usbnet *dev = netdev_priv(net);
1313 unsigned int length;
1314 struct urb *urb = NULL;
1315 struct skb_data *entry;
1316 struct driver_info *info = dev->driver_info;
1317 unsigned long flags;
1318 int retval;
1319
1320 if (skb)
1321 skb_tx_timestamp(skb);
1322
1323 // some devices want funky USB-level framing, for
1324 // win32 driver (usually) and/or hardware quirks
1325 if (info->tx_fixup) {
1326 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1327 if (!skb) {
1328 /* packet collected; minidriver waiting for more */
1329 if (info->flags & FLAG_MULTI_PACKET)
1330 goto not_drop;
1331 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1332 goto drop;
1333 }
1334 }
1335
1336 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1337 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1338 goto drop;
1339 }
1340
1341 entry = (struct skb_data *) skb->cb;
1342 entry->urb = urb;
1343 entry->dev = dev;
1344
1345 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1346 skb->data, skb->len, tx_complete, skb);
1347 if (dev->can_dma_sg) {
1348 if (build_dma_sg(skb, urb) < 0)
1349 goto drop;
1350 }
1351 length = urb->transfer_buffer_length;
1352
1353 /* don't assume the hardware handles USB_ZERO_PACKET
1354 * NOTE: strictly conforming cdc-ether devices should expect
1355 * the ZLP here, but ignore the one-byte packet.
1356 * NOTE2: CDC NCM specification is different from CDC ECM when
1357 * handling ZLP/short packets, so cdc_ncm driver will make short
1358 * packet itself if needed.
1359 */
1360 if (length % dev->maxpacket == 0) {
1361 if (!(info->flags & FLAG_SEND_ZLP)) {
1362 if (!(info->flags & FLAG_MULTI_PACKET)) {
1363 length++;
1364 if (skb_tailroom(skb) && !urb->num_sgs) {
1365 skb->data[skb->len] = 0;
1366 __skb_put(skb, 1);
1367 } else if (urb->num_sgs)
1368 sg_set_buf(&urb->sg[urb->num_sgs++],
1369 dev->padding_pkt, 1);
1370 }
1371 } else
1372 urb->transfer_flags |= URB_ZERO_PACKET;
1373 }
1374 urb->transfer_buffer_length = length;
1375
1376 if (info->flags & FLAG_MULTI_PACKET) {
1377 /* Driver has set number of packets and a length delta.
1378 * Calculate the complete length and ensure that it's
1379 * positive.
1380 */
1381 entry->length += length;
1382 if (WARN_ON_ONCE(entry->length <= 0))
1383 entry->length = length;
1384 } else {
1385 usbnet_set_skb_tx_stats(skb, 1, length);
1386 }
1387
1388 spin_lock_irqsave(&dev->txq.lock, flags);
1389 retval = usb_autopm_get_interface_async(dev->intf);
1390 if (retval < 0) {
1391 spin_unlock_irqrestore(&dev->txq.lock, flags);
1392 goto drop;
1393 }
1394
1395 #ifdef CONFIG_PM
1396 /* if this triggers the device is still a sleep */
1397 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1398 /* transmission will be done in resume */
1399 usb_anchor_urb(urb, &dev->deferred);
1400 /* no use to process more packets */
1401 netif_stop_queue(net);
1402 usb_put_urb(urb);
1403 spin_unlock_irqrestore(&dev->txq.lock, flags);
1404 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1405 goto deferred;
1406 }
1407 #endif
1408
1409 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1410 case -EPIPE:
1411 netif_stop_queue (net);
1412 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1413 usb_autopm_put_interface_async(dev->intf);
1414 break;
1415 default:
1416 usb_autopm_put_interface_async(dev->intf);
1417 netif_dbg(dev, tx_err, dev->net,
1418 "tx: submit urb err %d\n", retval);
1419 break;
1420 case 0:
1421 netif_trans_update(net);
1422 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1423 if (dev->txq.qlen >= TX_QLEN (dev))
1424 netif_stop_queue (net);
1425 }
1426 spin_unlock_irqrestore (&dev->txq.lock, flags);
1427
1428 if (retval) {
1429 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1430 drop:
1431 dev->net->stats.tx_dropped++;
1432 not_drop:
1433 if (skb)
1434 dev_kfree_skb_any (skb);
1435 if (urb) {
1436 kfree(urb->sg);
1437 usb_free_urb(urb);
1438 }
1439 } else
1440 netif_dbg(dev, tx_queued, dev->net,
1441 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1442 #ifdef CONFIG_PM
1443 deferred:
1444 #endif
1445 return NETDEV_TX_OK;
1446 }
1447 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1448
1449 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1450 {
1451 struct urb *urb;
1452 int i;
1453 int ret = 0;
1454
1455 /* don't refill the queue all at once */
1456 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1457 urb = usb_alloc_urb(0, flags);
1458 if (urb != NULL) {
1459 ret = rx_submit(dev, urb, flags);
1460 if (ret)
1461 goto err;
1462 } else {
1463 ret = -ENOMEM;
1464 goto err;
1465 }
1466 }
1467 err:
1468 return ret;
1469 }
1470
1471 /*-------------------------------------------------------------------------*/
1472
1473 // tasklet (work deferred from completions, in_irq) or timer
1474
1475 static void usbnet_bh (unsigned long param)
1476 {
1477 struct usbnet *dev = (struct usbnet *) param;
1478 struct sk_buff *skb;
1479 struct skb_data *entry;
1480
1481 while ((skb = skb_dequeue (&dev->done))) {
1482 entry = (struct skb_data *) skb->cb;
1483 switch (entry->state) {
1484 case rx_done:
1485 entry->state = rx_cleanup;
1486 rx_process (dev, skb);
1487 continue;
1488 case tx_done:
1489 kfree(entry->urb->sg);
1490 case rx_cleanup:
1491 usb_free_urb (entry->urb);
1492 dev_kfree_skb (skb);
1493 continue;
1494 default:
1495 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1496 }
1497 }
1498
1499 /* restart RX again after disabling due to high error rate */
1500 clear_bit(EVENT_RX_KILL, &dev->flags);
1501
1502 /* waiting for all pending urbs to complete?
1503 * only then can we forgo submitting anew
1504 */
1505 if (waitqueue_active(&dev->wait)) {
1506 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1507 wake_up_all(&dev->wait);
1508
1509 // or are we maybe short a few urbs?
1510 } else if (netif_running (dev->net) &&
1511 netif_device_present (dev->net) &&
1512 netif_carrier_ok(dev->net) &&
1513 !timer_pending(&dev->delay) &&
1514 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1515 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1516 int temp = dev->rxq.qlen;
1517
1518 if (temp < RX_QLEN(dev)) {
1519 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1520 return;
1521 if (temp != dev->rxq.qlen)
1522 netif_dbg(dev, link, dev->net,
1523 "rxqlen %d --> %d\n",
1524 temp, dev->rxq.qlen);
1525 if (dev->rxq.qlen < RX_QLEN(dev))
1526 tasklet_schedule (&dev->bh);
1527 }
1528 if (dev->txq.qlen < TX_QLEN (dev))
1529 netif_wake_queue (dev->net);
1530 }
1531 }
1532
1533
1534 /*-------------------------------------------------------------------------
1535 *
1536 * USB Device Driver support
1537 *
1538 *-------------------------------------------------------------------------*/
1539
1540 // precondition: never called in_interrupt
1541
1542 void usbnet_disconnect (struct usb_interface *intf)
1543 {
1544 struct usbnet *dev;
1545 struct usb_device *xdev;
1546 struct net_device *net;
1547
1548 dev = usb_get_intfdata(intf);
1549 usb_set_intfdata(intf, NULL);
1550 if (!dev)
1551 return;
1552
1553 xdev = interface_to_usbdev (intf);
1554
1555 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1556 intf->dev.driver->name,
1557 xdev->bus->bus_name, xdev->devpath,
1558 dev->driver_info->description);
1559
1560 net = dev->net;
1561 unregister_netdev (net);
1562
1563 cancel_work_sync(&dev->kevent);
1564
1565 usb_scuttle_anchored_urbs(&dev->deferred);
1566
1567 if (dev->driver_info->unbind)
1568 dev->driver_info->unbind (dev, intf);
1569
1570 usb_kill_urb(dev->interrupt);
1571 usb_free_urb(dev->interrupt);
1572 kfree(dev->padding_pkt);
1573
1574 free_netdev(net);
1575 }
1576 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1577
1578 static const struct net_device_ops usbnet_netdev_ops = {
1579 .ndo_open = usbnet_open,
1580 .ndo_stop = usbnet_stop,
1581 .ndo_start_xmit = usbnet_start_xmit,
1582 .ndo_tx_timeout = usbnet_tx_timeout,
1583 .ndo_set_rx_mode = usbnet_set_rx_mode,
1584 .ndo_change_mtu = usbnet_change_mtu,
1585 .ndo_set_mac_address = eth_mac_addr,
1586 .ndo_validate_addr = eth_validate_addr,
1587 };
1588
1589 /*-------------------------------------------------------------------------*/
1590
1591 // precondition: never called in_interrupt
1592
1593 static struct device_type wlan_type = {
1594 .name = "wlan",
1595 };
1596
1597 static struct device_type wwan_type = {
1598 .name = "wwan",
1599 };
1600
1601 int
1602 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1603 {
1604 struct usbnet *dev;
1605 struct net_device *net;
1606 struct usb_host_interface *interface;
1607 struct driver_info *info;
1608 struct usb_device *xdev;
1609 int status;
1610 const char *name;
1611 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1612
1613 /* usbnet already took usb runtime pm, so have to enable the feature
1614 * for usb interface, otherwise usb_autopm_get_interface may return
1615 * failure if RUNTIME_PM is enabled.
1616 */
1617 if (!driver->supports_autosuspend) {
1618 driver->supports_autosuspend = 1;
1619 pm_runtime_enable(&udev->dev);
1620 }
1621
1622 name = udev->dev.driver->name;
1623 info = (struct driver_info *) prod->driver_info;
1624 if (!info) {
1625 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1626 return -ENODEV;
1627 }
1628 xdev = interface_to_usbdev (udev);
1629 interface = udev->cur_altsetting;
1630
1631 status = -ENOMEM;
1632
1633 // set up our own records
1634 net = alloc_etherdev(sizeof(*dev));
1635 if (!net)
1636 goto out;
1637
1638 /* netdev_printk() needs this so do it as early as possible */
1639 SET_NETDEV_DEV(net, &udev->dev);
1640
1641 dev = netdev_priv(net);
1642 dev->udev = xdev;
1643 dev->intf = udev;
1644 dev->driver_info = info;
1645 dev->driver_name = name;
1646 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1647 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1648 init_waitqueue_head(&dev->wait);
1649 skb_queue_head_init (&dev->rxq);
1650 skb_queue_head_init (&dev->txq);
1651 skb_queue_head_init (&dev->done);
1652 skb_queue_head_init(&dev->rxq_pause);
1653 dev->bh.func = usbnet_bh;
1654 dev->bh.data = (unsigned long) dev;
1655 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1656 init_usb_anchor(&dev->deferred);
1657 dev->delay.function = usbnet_bh;
1658 dev->delay.data = (unsigned long) dev;
1659 init_timer (&dev->delay);
1660 mutex_init (&dev->phy_mutex);
1661 mutex_init(&dev->interrupt_mutex);
1662 dev->interrupt_count = 0;
1663
1664 dev->net = net;
1665 strcpy (net->name, "usb%d");
1666 memcpy (net->dev_addr, node_id, sizeof node_id);
1667
1668 /* rx and tx sides can use different message sizes;
1669 * bind() should set rx_urb_size in that case.
1670 */
1671 dev->hard_mtu = net->mtu + net->hard_header_len;
1672
1673 net->netdev_ops = &usbnet_netdev_ops;
1674 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1675 net->ethtool_ops = &usbnet_ethtool_ops;
1676
1677 // allow device-specific bind/init procedures
1678 // NOTE net->name still not usable ...
1679 if (info->bind) {
1680 status = info->bind (dev, udev);
1681 if (status < 0)
1682 goto out1;
1683
1684 // heuristic: "usb%d" for links we know are two-host,
1685 // else "eth%d" when there's reasonable doubt. userspace
1686 // can rename the link if it knows better.
1687 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1688 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1689 (net->dev_addr [0] & 0x02) == 0))
1690 strcpy (net->name, "eth%d");
1691 /* WLAN devices should always be named "wlan%d" */
1692 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1693 strcpy(net->name, "wlan%d");
1694 /* WWAN devices should always be named "wwan%d" */
1695 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1696 strcpy(net->name, "wwan%d");
1697
1698 /* devices that cannot do ARP */
1699 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1700 net->flags |= IFF_NOARP;
1701
1702 /* maybe the remote can't receive an Ethernet MTU */
1703 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1704 net->mtu = dev->hard_mtu - net->hard_header_len;
1705 } else if (!info->in || !info->out)
1706 status = usbnet_get_endpoints (dev, udev);
1707 else {
1708 dev->in = usb_rcvbulkpipe (xdev, info->in);
1709 dev->out = usb_sndbulkpipe (xdev, info->out);
1710 if (!(info->flags & FLAG_NO_SETINT))
1711 status = usb_set_interface (xdev,
1712 interface->desc.bInterfaceNumber,
1713 interface->desc.bAlternateSetting);
1714 else
1715 status = 0;
1716
1717 }
1718 if (status >= 0 && dev->status)
1719 status = init_status (dev, udev);
1720 if (status < 0)
1721 goto out3;
1722
1723 if (!dev->rx_urb_size)
1724 dev->rx_urb_size = dev->hard_mtu;
1725 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1726
1727 /* let userspace know we have a random address */
1728 if (ether_addr_equal(net->dev_addr, node_id))
1729 net->addr_assign_type = NET_ADDR_RANDOM;
1730
1731 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1732 SET_NETDEV_DEVTYPE(net, &wlan_type);
1733 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1734 SET_NETDEV_DEVTYPE(net, &wwan_type);
1735
1736 /* initialize max rx_qlen and tx_qlen */
1737 usbnet_update_max_qlen(dev);
1738
1739 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1740 !(info->flags & FLAG_MULTI_PACKET)) {
1741 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1742 if (!dev->padding_pkt) {
1743 status = -ENOMEM;
1744 goto out4;
1745 }
1746 }
1747
1748 status = register_netdev (net);
1749 if (status)
1750 goto out5;
1751 netif_info(dev, probe, dev->net,
1752 "register '%s' at usb-%s-%s, %s, %pM\n",
1753 udev->dev.driver->name,
1754 xdev->bus->bus_name, xdev->devpath,
1755 dev->driver_info->description,
1756 net->dev_addr);
1757
1758 // ok, it's ready to go.
1759 usb_set_intfdata (udev, dev);
1760
1761 netif_device_attach (net);
1762
1763 if (dev->driver_info->flags & FLAG_LINK_INTR)
1764 usbnet_link_change(dev, 0, 0);
1765
1766 return 0;
1767
1768 out5:
1769 kfree(dev->padding_pkt);
1770 out4:
1771 usb_free_urb(dev->interrupt);
1772 out3:
1773 if (info->unbind)
1774 info->unbind (dev, udev);
1775 out1:
1776 /* subdrivers must undo all they did in bind() if they
1777 * fail it, but we may fail later and a deferred kevent
1778 * may trigger an error resubmitting itself and, worse,
1779 * schedule a timer. So we kill it all just in case.
1780 */
1781 cancel_work_sync(&dev->kevent);
1782 del_timer_sync(&dev->delay);
1783 free_netdev(net);
1784 out:
1785 return status;
1786 }
1787 EXPORT_SYMBOL_GPL(usbnet_probe);
1788
1789 /*-------------------------------------------------------------------------*/
1790
1791 /*
1792 * suspend the whole driver as soon as the first interface is suspended
1793 * resume only when the last interface is resumed
1794 */
1795
1796 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1797 {
1798 struct usbnet *dev = usb_get_intfdata(intf);
1799
1800 if (!dev->suspend_count++) {
1801 spin_lock_irq(&dev->txq.lock);
1802 /* don't autosuspend while transmitting */
1803 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1804 dev->suspend_count--;
1805 spin_unlock_irq(&dev->txq.lock);
1806 return -EBUSY;
1807 } else {
1808 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1809 spin_unlock_irq(&dev->txq.lock);
1810 }
1811 /*
1812 * accelerate emptying of the rx and queues, to avoid
1813 * having everything error out.
1814 */
1815 netif_device_detach (dev->net);
1816 usbnet_terminate_urbs(dev);
1817 __usbnet_status_stop_force(dev);
1818
1819 /*
1820 * reattach so runtime management can use and
1821 * wake the device
1822 */
1823 netif_device_attach (dev->net);
1824 }
1825 return 0;
1826 }
1827 EXPORT_SYMBOL_GPL(usbnet_suspend);
1828
1829 int usbnet_resume (struct usb_interface *intf)
1830 {
1831 struct usbnet *dev = usb_get_intfdata(intf);
1832 struct sk_buff *skb;
1833 struct urb *res;
1834 int retval;
1835
1836 if (!--dev->suspend_count) {
1837 /* resume interrupt URB if it was previously submitted */
1838 __usbnet_status_start_force(dev, GFP_NOIO);
1839
1840 spin_lock_irq(&dev->txq.lock);
1841 while ((res = usb_get_from_anchor(&dev->deferred))) {
1842
1843 skb = (struct sk_buff *)res->context;
1844 retval = usb_submit_urb(res, GFP_ATOMIC);
1845 if (retval < 0) {
1846 dev_kfree_skb_any(skb);
1847 kfree(res->sg);
1848 usb_free_urb(res);
1849 usb_autopm_put_interface_async(dev->intf);
1850 } else {
1851 netif_trans_update(dev->net);
1852 __skb_queue_tail(&dev->txq, skb);
1853 }
1854 }
1855
1856 smp_mb();
1857 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1858 spin_unlock_irq(&dev->txq.lock);
1859
1860 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1861 /* handle remote wakeup ASAP
1862 * we cannot race against stop
1863 */
1864 if (netif_device_present(dev->net) &&
1865 !timer_pending(&dev->delay) &&
1866 !test_bit(EVENT_RX_HALT, &dev->flags))
1867 rx_alloc_submit(dev, GFP_NOIO);
1868
1869 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1870 netif_tx_wake_all_queues(dev->net);
1871 tasklet_schedule (&dev->bh);
1872 }
1873 }
1874
1875 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1876 usb_autopm_get_interface_no_resume(intf);
1877
1878 return 0;
1879 }
1880 EXPORT_SYMBOL_GPL(usbnet_resume);
1881
1882 /*
1883 * Either a subdriver implements manage_power, then it is assumed to always
1884 * be ready to be suspended or it reports the readiness to be suspended
1885 * explicitly
1886 */
1887 void usbnet_device_suggests_idle(struct usbnet *dev)
1888 {
1889 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1890 dev->intf->needs_remote_wakeup = 1;
1891 usb_autopm_put_interface_async(dev->intf);
1892 }
1893 }
1894 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1895
1896 /*
1897 * For devices that can do without special commands
1898 */
1899 int usbnet_manage_power(struct usbnet *dev, int on)
1900 {
1901 dev->intf->needs_remote_wakeup = on;
1902 return 0;
1903 }
1904 EXPORT_SYMBOL(usbnet_manage_power);
1905
1906 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1907 {
1908 /* update link after link is reseted */
1909 if (link && !need_reset)
1910 netif_carrier_on(dev->net);
1911 else
1912 netif_carrier_off(dev->net);
1913
1914 if (need_reset && link)
1915 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1916 else
1917 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1918 }
1919 EXPORT_SYMBOL(usbnet_link_change);
1920
1921 /*-------------------------------------------------------------------------*/
1922 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1923 u16 value, u16 index, void *data, u16 size)
1924 {
1925 void *buf = NULL;
1926 int err = -ENOMEM;
1927
1928 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1929 " value=0x%04x index=0x%04x size=%d\n",
1930 cmd, reqtype, value, index, size);
1931
1932 if (data) {
1933 buf = kmalloc(size, GFP_KERNEL);
1934 if (!buf)
1935 goto out;
1936 }
1937
1938 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1939 cmd, reqtype, value, index, buf, size,
1940 USB_CTRL_GET_TIMEOUT);
1941 if (err > 0 && err <= size)
1942 memcpy(data, buf, err);
1943 kfree(buf);
1944 out:
1945 return err;
1946 }
1947
1948 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1949 u16 value, u16 index, const void *data,
1950 u16 size)
1951 {
1952 void *buf = NULL;
1953 int err = -ENOMEM;
1954
1955 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1956 " value=0x%04x index=0x%04x size=%d\n",
1957 cmd, reqtype, value, index, size);
1958
1959 if (data) {
1960 buf = kmemdup(data, size, GFP_KERNEL);
1961 if (!buf)
1962 goto out;
1963 }
1964
1965 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1966 cmd, reqtype, value, index, buf, size,
1967 USB_CTRL_SET_TIMEOUT);
1968 kfree(buf);
1969
1970 out:
1971 return err;
1972 }
1973
1974 /*
1975 * The function can't be called inside suspend/resume callback,
1976 * otherwise deadlock will be caused.
1977 */
1978 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1979 u16 value, u16 index, void *data, u16 size)
1980 {
1981 int ret;
1982
1983 if (usb_autopm_get_interface(dev->intf) < 0)
1984 return -ENODEV;
1985 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1986 data, size);
1987 usb_autopm_put_interface(dev->intf);
1988 return ret;
1989 }
1990 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1991
1992 /*
1993 * The function can't be called inside suspend/resume callback,
1994 * otherwise deadlock will be caused.
1995 */
1996 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1997 u16 value, u16 index, const void *data, u16 size)
1998 {
1999 int ret;
2000
2001 if (usb_autopm_get_interface(dev->intf) < 0)
2002 return -ENODEV;
2003 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2004 data, size);
2005 usb_autopm_put_interface(dev->intf);
2006 return ret;
2007 }
2008 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2009
2010 /*
2011 * The function can be called inside suspend/resume callback safely
2012 * and should only be called by suspend/resume callback generally.
2013 */
2014 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2015 u16 value, u16 index, void *data, u16 size)
2016 {
2017 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2018 data, size);
2019 }
2020 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2021
2022 /*
2023 * The function can be called inside suspend/resume callback safely
2024 * and should only be called by suspend/resume callback generally.
2025 */
2026 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2027 u16 value, u16 index, const void *data,
2028 u16 size)
2029 {
2030 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2031 data, size);
2032 }
2033 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2034
2035 static void usbnet_async_cmd_cb(struct urb *urb)
2036 {
2037 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2038 int status = urb->status;
2039
2040 if (status < 0)
2041 dev_dbg(&urb->dev->dev, "%s failed with %d",
2042 __func__, status);
2043
2044 kfree(req);
2045 usb_free_urb(urb);
2046 }
2047
2048 /*
2049 * The caller must make sure that device can't be put into suspend
2050 * state until the control URB completes.
2051 */
2052 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2053 u16 value, u16 index, const void *data, u16 size)
2054 {
2055 struct usb_ctrlrequest *req = NULL;
2056 struct urb *urb;
2057 int err = -ENOMEM;
2058 void *buf = NULL;
2059
2060 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2061 " value=0x%04x index=0x%04x size=%d\n",
2062 cmd, reqtype, value, index, size);
2063
2064 urb = usb_alloc_urb(0, GFP_ATOMIC);
2065 if (!urb)
2066 goto fail;
2067
2068 if (data) {
2069 buf = kmemdup(data, size, GFP_ATOMIC);
2070 if (!buf) {
2071 netdev_err(dev->net, "Error allocating buffer"
2072 " in %s!\n", __func__);
2073 goto fail_free;
2074 }
2075 }
2076
2077 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2078 if (!req)
2079 goto fail_free_buf;
2080
2081 req->bRequestType = reqtype;
2082 req->bRequest = cmd;
2083 req->wValue = cpu_to_le16(value);
2084 req->wIndex = cpu_to_le16(index);
2085 req->wLength = cpu_to_le16(size);
2086
2087 usb_fill_control_urb(urb, dev->udev,
2088 usb_sndctrlpipe(dev->udev, 0),
2089 (void *)req, buf, size,
2090 usbnet_async_cmd_cb, req);
2091 urb->transfer_flags |= URB_FREE_BUFFER;
2092
2093 err = usb_submit_urb(urb, GFP_ATOMIC);
2094 if (err < 0) {
2095 netdev_err(dev->net, "Error submitting the control"
2096 " message: status=%d\n", err);
2097 goto fail_free;
2098 }
2099 return 0;
2100
2101 fail_free_buf:
2102 kfree(buf);
2103 fail_free:
2104 kfree(req);
2105 usb_free_urb(urb);
2106 fail:
2107 return err;
2108
2109 }
2110 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2111 /*-------------------------------------------------------------------------*/
2112
2113 static int __init usbnet_init(void)
2114 {
2115 /* Compiler should optimize this out. */
2116 BUILD_BUG_ON(
2117 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2118
2119 eth_random_addr(node_id);
2120 return 0;
2121 }
2122 module_init(usbnet_init);
2123
2124 static void __exit usbnet_exit(void)
2125 {
2126 }
2127 module_exit(usbnet_exit);
2128
2129 MODULE_AUTHOR("David Brownell");
2130 MODULE_DESCRIPTION("USB network driver framework");
2131 MODULE_LICENSE("GPL");
Linux with added FPC-III support