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[deliverable/linux.git] / drivers / net / usb / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
24 *
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
31
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/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 skb->protocol = eth_type_trans (skb, dev->net);
327 dev->net->stats.rx_packets++;
328 dev->net->stats.rx_bytes += skb->len;
329
330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
331 skb->len + sizeof (struct ethhdr), skb->protocol);
332 memset (skb->cb, 0, sizeof (struct skb_data));
333
334 if (skb_defer_rx_timestamp(skb))
335 return;
336
337 status = netif_rx (skb);
338 if (status != NET_RX_SUCCESS)
339 netif_dbg(dev, rx_err, dev->net,
340 "netif_rx status %d\n", status);
341 }
342 EXPORT_SYMBOL_GPL(usbnet_skb_return);
343
344 /* must be called if hard_mtu or rx_urb_size changed */
345 void usbnet_update_max_qlen(struct usbnet *dev)
346 {
347 enum usb_device_speed speed = dev->udev->speed;
348
349 switch (speed) {
350 case USB_SPEED_HIGH:
351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
353 break;
354 case USB_SPEED_SUPER:
355 /*
356 * Not take default 5ms qlen for super speed HC to
357 * save memory, and iperf tests show 2.5ms qlen can
358 * work well
359 */
360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
362 break;
363 default:
364 dev->rx_qlen = dev->tx_qlen = 4;
365 }
366 }
367 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
368
369 \f
370 /*-------------------------------------------------------------------------
371 *
372 * Network Device Driver (peer link to "Host Device", from USB host)
373 *
374 *-------------------------------------------------------------------------*/
375
376 int usbnet_change_mtu (struct net_device *net, int new_mtu)
377 {
378 struct usbnet *dev = netdev_priv(net);
379 int ll_mtu = new_mtu + net->hard_header_len;
380 int old_hard_mtu = dev->hard_mtu;
381 int old_rx_urb_size = dev->rx_urb_size;
382
383 if (new_mtu <= 0)
384 return -EINVAL;
385 // no second zero-length packet read wanted after mtu-sized packets
386 if ((ll_mtu % dev->maxpacket) == 0)
387 return -EDOM;
388 net->mtu = new_mtu;
389
390 dev->hard_mtu = net->mtu + net->hard_header_len;
391 if (dev->rx_urb_size == old_hard_mtu) {
392 dev->rx_urb_size = dev->hard_mtu;
393 if (dev->rx_urb_size > old_rx_urb_size)
394 usbnet_unlink_rx_urbs(dev);
395 }
396
397 /* max qlen depend on hard_mtu and rx_urb_size */
398 usbnet_update_max_qlen(dev);
399
400 return 0;
401 }
402 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
403
404 /* The caller must hold list->lock */
405 static void __usbnet_queue_skb(struct sk_buff_head *list,
406 struct sk_buff *newsk, enum skb_state state)
407 {
408 struct skb_data *entry = (struct skb_data *) newsk->cb;
409
410 __skb_queue_tail(list, newsk);
411 entry->state = state;
412 }
413
414 /*-------------------------------------------------------------------------*/
415
416 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
417 * completion callbacks. 2.5 should have fixed those bugs...
418 */
419
420 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
421 struct sk_buff_head *list, enum skb_state state)
422 {
423 unsigned long flags;
424 enum skb_state old_state;
425 struct skb_data *entry = (struct skb_data *) skb->cb;
426
427 spin_lock_irqsave(&list->lock, flags);
428 old_state = entry->state;
429 entry->state = state;
430 __skb_unlink(skb, list);
431
432 /* defer_bh() is never called with list == &dev->done.
433 * spin_lock_nested() tells lockdep that it is OK to take
434 * dev->done.lock here with list->lock held.
435 */
436 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
437
438 __skb_queue_tail(&dev->done, skb);
439 if (dev->done.qlen == 1)
440 tasklet_schedule(&dev->bh);
441 spin_unlock(&dev->done.lock);
442 spin_unlock_irqrestore(&list->lock, flags);
443 return old_state;
444 }
445
446 /* some work can't be done in tasklets, so we use keventd
447 *
448 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
449 * but tasklet_schedule() doesn't. hope the failure is rare.
450 */
451 void usbnet_defer_kevent (struct usbnet *dev, int work)
452 {
453 set_bit (work, &dev->flags);
454 if (!schedule_work (&dev->kevent)) {
455 if (net_ratelimit())
456 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
457 } else {
458 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
459 }
460 }
461 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
462
463 /*-------------------------------------------------------------------------*/
464
465 static void rx_complete (struct urb *urb);
466
467 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
468 {
469 struct sk_buff *skb;
470 struct skb_data *entry;
471 int retval = 0;
472 unsigned long lockflags;
473 size_t size = dev->rx_urb_size;
474
475 /* prevent rx skb allocation when error ratio is high */
476 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
477 usb_free_urb(urb);
478 return -ENOLINK;
479 }
480
481 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
482 if (!skb) {
483 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
484 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
485 usb_free_urb (urb);
486 return -ENOMEM;
487 }
488
489 entry = (struct skb_data *) skb->cb;
490 entry->urb = urb;
491 entry->dev = dev;
492 entry->length = 0;
493
494 usb_fill_bulk_urb (urb, dev->udev, dev->in,
495 skb->data, size, rx_complete, skb);
496
497 spin_lock_irqsave (&dev->rxq.lock, lockflags);
498
499 if (netif_running (dev->net) &&
500 netif_device_present (dev->net) &&
501 !test_bit (EVENT_RX_HALT, &dev->flags) &&
502 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
503 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
504 case -EPIPE:
505 usbnet_defer_kevent (dev, EVENT_RX_HALT);
506 break;
507 case -ENOMEM:
508 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
509 break;
510 case -ENODEV:
511 netif_dbg(dev, ifdown, dev->net, "device gone\n");
512 netif_device_detach (dev->net);
513 break;
514 case -EHOSTUNREACH:
515 retval = -ENOLINK;
516 break;
517 default:
518 netif_dbg(dev, rx_err, dev->net,
519 "rx submit, %d\n", retval);
520 tasklet_schedule (&dev->bh);
521 break;
522 case 0:
523 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
524 }
525 } else {
526 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
527 retval = -ENOLINK;
528 }
529 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
530 if (retval) {
531 dev_kfree_skb_any (skb);
532 usb_free_urb (urb);
533 }
534 return retval;
535 }
536
537
538 /*-------------------------------------------------------------------------*/
539
540 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
541 {
542 if (dev->driver_info->rx_fixup &&
543 !dev->driver_info->rx_fixup (dev, skb)) {
544 /* With RX_ASSEMBLE, rx_fixup() must update counters */
545 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
546 dev->net->stats.rx_errors++;
547 goto done;
548 }
549 // else network stack removes extra byte if we forced a short packet
550
551 /* all data was already cloned from skb inside the driver */
552 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
553 goto done;
554
555 if (skb->len < ETH_HLEN) {
556 dev->net->stats.rx_errors++;
557 dev->net->stats.rx_length_errors++;
558 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
559 } else {
560 usbnet_skb_return(dev, skb);
561 return;
562 }
563
564 done:
565 skb_queue_tail(&dev->done, skb);
566 }
567
568 /*-------------------------------------------------------------------------*/
569
570 static void rx_complete (struct urb *urb)
571 {
572 struct sk_buff *skb = (struct sk_buff *) urb->context;
573 struct skb_data *entry = (struct skb_data *) skb->cb;
574 struct usbnet *dev = entry->dev;
575 int urb_status = urb->status;
576 enum skb_state state;
577
578 skb_put (skb, urb->actual_length);
579 state = rx_done;
580 entry->urb = NULL;
581
582 switch (urb_status) {
583 /* success */
584 case 0:
585 break;
586
587 /* stalls need manual reset. this is rare ... except that
588 * when going through USB 2.0 TTs, unplug appears this way.
589 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
590 * storm, recovering as needed.
591 */
592 case -EPIPE:
593 dev->net->stats.rx_errors++;
594 usbnet_defer_kevent (dev, EVENT_RX_HALT);
595 // FALLTHROUGH
596
597 /* software-driven interface shutdown */
598 case -ECONNRESET: /* async unlink */
599 case -ESHUTDOWN: /* hardware gone */
600 netif_dbg(dev, ifdown, dev->net,
601 "rx shutdown, code %d\n", urb_status);
602 goto block;
603
604 /* we get controller i/o faults during hub_wq disconnect() delays.
605 * throttle down resubmits, to avoid log floods; just temporarily,
606 * so we still recover when the fault isn't a hub_wq delay.
607 */
608 case -EPROTO:
609 case -ETIME:
610 case -EILSEQ:
611 dev->net->stats.rx_errors++;
612 if (!timer_pending (&dev->delay)) {
613 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
614 netif_dbg(dev, link, dev->net,
615 "rx throttle %d\n", urb_status);
616 }
617 block:
618 state = rx_cleanup;
619 entry->urb = urb;
620 urb = NULL;
621 break;
622
623 /* data overrun ... flush fifo? */
624 case -EOVERFLOW:
625 dev->net->stats.rx_over_errors++;
626 // FALLTHROUGH
627
628 default:
629 state = rx_cleanup;
630 dev->net->stats.rx_errors++;
631 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
632 break;
633 }
634
635 /* stop rx if packet error rate is high */
636 if (++dev->pkt_cnt > 30) {
637 dev->pkt_cnt = 0;
638 dev->pkt_err = 0;
639 } else {
640 if (state == rx_cleanup)
641 dev->pkt_err++;
642 if (dev->pkt_err > 20)
643 set_bit(EVENT_RX_KILL, &dev->flags);
644 }
645
646 state = defer_bh(dev, skb, &dev->rxq, state);
647
648 if (urb) {
649 if (netif_running (dev->net) &&
650 !test_bit (EVENT_RX_HALT, &dev->flags) &&
651 state != unlink_start) {
652 rx_submit (dev, urb, GFP_ATOMIC);
653 usb_mark_last_busy(dev->udev);
654 return;
655 }
656 usb_free_urb (urb);
657 }
658 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
659 }
660
661 /*-------------------------------------------------------------------------*/
662 void usbnet_pause_rx(struct usbnet *dev)
663 {
664 set_bit(EVENT_RX_PAUSED, &dev->flags);
665
666 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
667 }
668 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
669
670 void usbnet_resume_rx(struct usbnet *dev)
671 {
672 struct sk_buff *skb;
673 int num = 0;
674
675 clear_bit(EVENT_RX_PAUSED, &dev->flags);
676
677 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
678 usbnet_skb_return(dev, skb);
679 num++;
680 }
681
682 tasklet_schedule(&dev->bh);
683
684 netif_dbg(dev, rx_status, dev->net,
685 "paused rx queue disabled, %d skbs requeued\n", num);
686 }
687 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
688
689 void usbnet_purge_paused_rxq(struct usbnet *dev)
690 {
691 skb_queue_purge(&dev->rxq_pause);
692 }
693 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
694
695 /*-------------------------------------------------------------------------*/
696
697 // unlink pending rx/tx; completion handlers do all other cleanup
698
699 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
700 {
701 unsigned long flags;
702 struct sk_buff *skb;
703 int count = 0;
704
705 spin_lock_irqsave (&q->lock, flags);
706 while (!skb_queue_empty(q)) {
707 struct skb_data *entry;
708 struct urb *urb;
709 int retval;
710
711 skb_queue_walk(q, skb) {
712 entry = (struct skb_data *) skb->cb;
713 if (entry->state != unlink_start)
714 goto found;
715 }
716 break;
717 found:
718 entry->state = unlink_start;
719 urb = entry->urb;
720
721 /*
722 * Get reference count of the URB to avoid it to be
723 * freed during usb_unlink_urb, which may trigger
724 * use-after-free problem inside usb_unlink_urb since
725 * usb_unlink_urb is always racing with .complete
726 * handler(include defer_bh).
727 */
728 usb_get_urb(urb);
729 spin_unlock_irqrestore(&q->lock, flags);
730 // during some PM-driven resume scenarios,
731 // these (async) unlinks complete immediately
732 retval = usb_unlink_urb (urb);
733 if (retval != -EINPROGRESS && retval != 0)
734 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
735 else
736 count++;
737 usb_put_urb(urb);
738 spin_lock_irqsave(&q->lock, flags);
739 }
740 spin_unlock_irqrestore (&q->lock, flags);
741 return count;
742 }
743
744 // Flush all pending rx urbs
745 // minidrivers may need to do this when the MTU changes
746
747 void usbnet_unlink_rx_urbs(struct usbnet *dev)
748 {
749 if (netif_running(dev->net)) {
750 (void) unlink_urbs (dev, &dev->rxq);
751 tasklet_schedule(&dev->bh);
752 }
753 }
754 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
755
756 /*-------------------------------------------------------------------------*/
757
758 static void wait_skb_queue_empty(struct sk_buff_head *q)
759 {
760 unsigned long flags;
761
762 spin_lock_irqsave(&q->lock, flags);
763 while (!skb_queue_empty(q)) {
764 spin_unlock_irqrestore(&q->lock, flags);
765 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
766 set_current_state(TASK_UNINTERRUPTIBLE);
767 spin_lock_irqsave(&q->lock, flags);
768 }
769 spin_unlock_irqrestore(&q->lock, flags);
770 }
771
772 // precondition: never called in_interrupt
773 static void usbnet_terminate_urbs(struct usbnet *dev)
774 {
775 DECLARE_WAITQUEUE(wait, current);
776 int temp;
777
778 /* ensure there are no more active urbs */
779 add_wait_queue(&dev->wait, &wait);
780 set_current_state(TASK_UNINTERRUPTIBLE);
781 temp = unlink_urbs(dev, &dev->txq) +
782 unlink_urbs(dev, &dev->rxq);
783
784 /* maybe wait for deletions to finish. */
785 wait_skb_queue_empty(&dev->rxq);
786 wait_skb_queue_empty(&dev->txq);
787 wait_skb_queue_empty(&dev->done);
788 netif_dbg(dev, ifdown, dev->net,
789 "waited for %d urb completions\n", temp);
790 set_current_state(TASK_RUNNING);
791 remove_wait_queue(&dev->wait, &wait);
792 }
793
794 int usbnet_stop (struct net_device *net)
795 {
796 struct usbnet *dev = netdev_priv(net);
797 struct driver_info *info = dev->driver_info;
798 int retval, pm, mpn;
799
800 clear_bit(EVENT_DEV_OPEN, &dev->flags);
801 netif_stop_queue (net);
802
803 netif_info(dev, ifdown, dev->net,
804 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
805 net->stats.rx_packets, net->stats.tx_packets,
806 net->stats.rx_errors, net->stats.tx_errors);
807
808 /* to not race resume */
809 pm = usb_autopm_get_interface(dev->intf);
810 /* allow minidriver to stop correctly (wireless devices to turn off
811 * radio etc) */
812 if (info->stop) {
813 retval = info->stop(dev);
814 if (retval < 0)
815 netif_info(dev, ifdown, dev->net,
816 "stop fail (%d) usbnet usb-%s-%s, %s\n",
817 retval,
818 dev->udev->bus->bus_name, dev->udev->devpath,
819 info->description);
820 }
821
822 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
823 usbnet_terminate_urbs(dev);
824
825 usbnet_status_stop(dev);
826
827 usbnet_purge_paused_rxq(dev);
828
829 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
830
831 /* deferred work (task, timer, softirq) must also stop.
832 * can't flush_scheduled_work() until we drop rtnl (later),
833 * else workers could deadlock; so make workers a NOP.
834 */
835 dev->flags = 0;
836 del_timer_sync (&dev->delay);
837 tasklet_kill (&dev->bh);
838 if (!pm)
839 usb_autopm_put_interface(dev->intf);
840
841 if (info->manage_power && mpn)
842 info->manage_power(dev, 0);
843 else
844 usb_autopm_put_interface(dev->intf);
845
846 return 0;
847 }
848 EXPORT_SYMBOL_GPL(usbnet_stop);
849
850 /*-------------------------------------------------------------------------*/
851
852 // posts reads, and enables write queuing
853
854 // precondition: never called in_interrupt
855
856 int usbnet_open (struct net_device *net)
857 {
858 struct usbnet *dev = netdev_priv(net);
859 int retval;
860 struct driver_info *info = dev->driver_info;
861
862 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
863 netif_info(dev, ifup, dev->net,
864 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
865 retval,
866 dev->udev->bus->bus_name,
867 dev->udev->devpath,
868 info->description);
869 goto done_nopm;
870 }
871
872 // put into "known safe" state
873 if (info->reset && (retval = info->reset (dev)) < 0) {
874 netif_info(dev, ifup, dev->net,
875 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
876 retval,
877 dev->udev->bus->bus_name,
878 dev->udev->devpath,
879 info->description);
880 goto done;
881 }
882
883 /* hard_mtu or rx_urb_size may change in reset() */
884 usbnet_update_max_qlen(dev);
885
886 // insist peer be connected
887 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
888 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
889 goto done;
890 }
891
892 /* start any status interrupt transfer */
893 if (dev->interrupt) {
894 retval = usbnet_status_start(dev, GFP_KERNEL);
895 if (retval < 0) {
896 netif_err(dev, ifup, dev->net,
897 "intr submit %d\n", retval);
898 goto done;
899 }
900 }
901
902 set_bit(EVENT_DEV_OPEN, &dev->flags);
903 netif_start_queue (net);
904 netif_info(dev, ifup, dev->net,
905 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
906 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
907 dev->net->mtu,
908 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
909 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
910 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
911 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
912 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
913 "simple");
914
915 /* reset rx error state */
916 dev->pkt_cnt = 0;
917 dev->pkt_err = 0;
918 clear_bit(EVENT_RX_KILL, &dev->flags);
919
920 // delay posting reads until we're fully open
921 tasklet_schedule (&dev->bh);
922 if (info->manage_power) {
923 retval = info->manage_power(dev, 1);
924 if (retval < 0) {
925 retval = 0;
926 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
927 } else {
928 usb_autopm_put_interface(dev->intf);
929 }
930 }
931 return retval;
932 done:
933 usb_autopm_put_interface(dev->intf);
934 done_nopm:
935 return retval;
936 }
937 EXPORT_SYMBOL_GPL(usbnet_open);
938
939 /*-------------------------------------------------------------------------*/
940
941 /* ethtool methods; minidrivers may need to add some more, but
942 * they'll probably want to use this base set.
943 */
944
945 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
946 {
947 struct usbnet *dev = netdev_priv(net);
948
949 if (!dev->mii.mdio_read)
950 return -EOPNOTSUPP;
951
952 return mii_ethtool_gset(&dev->mii, cmd);
953 }
954 EXPORT_SYMBOL_GPL(usbnet_get_settings);
955
956 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
957 {
958 struct usbnet *dev = netdev_priv(net);
959 int retval;
960
961 if (!dev->mii.mdio_write)
962 return -EOPNOTSUPP;
963
964 retval = mii_ethtool_sset(&dev->mii, cmd);
965
966 /* link speed/duplex might have changed */
967 if (dev->driver_info->link_reset)
968 dev->driver_info->link_reset(dev);
969
970 /* hard_mtu or rx_urb_size may change in link_reset() */
971 usbnet_update_max_qlen(dev);
972
973 return retval;
974
975 }
976 EXPORT_SYMBOL_GPL(usbnet_set_settings);
977
978 u32 usbnet_get_link (struct net_device *net)
979 {
980 struct usbnet *dev = netdev_priv(net);
981
982 /* If a check_connect is defined, return its result */
983 if (dev->driver_info->check_connect)
984 return dev->driver_info->check_connect (dev) == 0;
985
986 /* if the device has mii operations, use those */
987 if (dev->mii.mdio_read)
988 return mii_link_ok(&dev->mii);
989
990 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
991 return ethtool_op_get_link(net);
992 }
993 EXPORT_SYMBOL_GPL(usbnet_get_link);
994
995 int usbnet_nway_reset(struct net_device *net)
996 {
997 struct usbnet *dev = netdev_priv(net);
998
999 if (!dev->mii.mdio_write)
1000 return -EOPNOTSUPP;
1001
1002 return mii_nway_restart(&dev->mii);
1003 }
1004 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1005
1006 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1007 {
1008 struct usbnet *dev = netdev_priv(net);
1009
1010 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1011 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1012 strlcpy (info->fw_version, dev->driver_info->description,
1013 sizeof info->fw_version);
1014 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1015 }
1016 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1017
1018 u32 usbnet_get_msglevel (struct net_device *net)
1019 {
1020 struct usbnet *dev = netdev_priv(net);
1021
1022 return dev->msg_enable;
1023 }
1024 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1025
1026 void usbnet_set_msglevel (struct net_device *net, u32 level)
1027 {
1028 struct usbnet *dev = netdev_priv(net);
1029
1030 dev->msg_enable = level;
1031 }
1032 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1033
1034 /* drivers may override default ethtool_ops in their bind() routine */
1035 static const struct ethtool_ops usbnet_ethtool_ops = {
1036 .get_settings = usbnet_get_settings,
1037 .set_settings = usbnet_set_settings,
1038 .get_link = usbnet_get_link,
1039 .nway_reset = usbnet_nway_reset,
1040 .get_drvinfo = usbnet_get_drvinfo,
1041 .get_msglevel = usbnet_get_msglevel,
1042 .set_msglevel = usbnet_set_msglevel,
1043 .get_ts_info = ethtool_op_get_ts_info,
1044 };
1045
1046 /*-------------------------------------------------------------------------*/
1047
1048 static void __handle_link_change(struct usbnet *dev)
1049 {
1050 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1051 return;
1052
1053 if (!netif_carrier_ok(dev->net)) {
1054 /* kill URBs for reading packets to save bus bandwidth */
1055 unlink_urbs(dev, &dev->rxq);
1056
1057 /*
1058 * tx_timeout will unlink URBs for sending packets and
1059 * tx queue is stopped by netcore after link becomes off
1060 */
1061 } else {
1062 /* submitting URBs for reading packets */
1063 tasklet_schedule(&dev->bh);
1064 }
1065
1066 /* hard_mtu or rx_urb_size may change during link change */
1067 usbnet_update_max_qlen(dev);
1068
1069 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1070 }
1071
1072 static void usbnet_set_rx_mode(struct net_device *net)
1073 {
1074 struct usbnet *dev = netdev_priv(net);
1075
1076 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1077 }
1078
1079 static void __handle_set_rx_mode(struct usbnet *dev)
1080 {
1081 if (dev->driver_info->set_rx_mode)
1082 (dev->driver_info->set_rx_mode)(dev);
1083
1084 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1085 }
1086
1087 /* work that cannot be done in interrupt context uses keventd.
1088 *
1089 * NOTE: with 2.5 we could do more of this using completion callbacks,
1090 * especially now that control transfers can be queued.
1091 */
1092 static void
1093 usbnet_deferred_kevent (struct work_struct *work)
1094 {
1095 struct usbnet *dev =
1096 container_of(work, struct usbnet, kevent);
1097 int status;
1098
1099 /* usb_clear_halt() needs a thread context */
1100 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1101 unlink_urbs (dev, &dev->txq);
1102 status = usb_autopm_get_interface(dev->intf);
1103 if (status < 0)
1104 goto fail_pipe;
1105 status = usb_clear_halt (dev->udev, dev->out);
1106 usb_autopm_put_interface(dev->intf);
1107 if (status < 0 &&
1108 status != -EPIPE &&
1109 status != -ESHUTDOWN) {
1110 if (netif_msg_tx_err (dev))
1111 fail_pipe:
1112 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1113 status);
1114 } else {
1115 clear_bit (EVENT_TX_HALT, &dev->flags);
1116 if (status != -ESHUTDOWN)
1117 netif_wake_queue (dev->net);
1118 }
1119 }
1120 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1121 unlink_urbs (dev, &dev->rxq);
1122 status = usb_autopm_get_interface(dev->intf);
1123 if (status < 0)
1124 goto fail_halt;
1125 status = usb_clear_halt (dev->udev, dev->in);
1126 usb_autopm_put_interface(dev->intf);
1127 if (status < 0 &&
1128 status != -EPIPE &&
1129 status != -ESHUTDOWN) {
1130 if (netif_msg_rx_err (dev))
1131 fail_halt:
1132 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1133 status);
1134 } else {
1135 clear_bit (EVENT_RX_HALT, &dev->flags);
1136 tasklet_schedule (&dev->bh);
1137 }
1138 }
1139
1140 /* tasklet could resubmit itself forever if memory is tight */
1141 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1142 struct urb *urb = NULL;
1143 int resched = 1;
1144
1145 if (netif_running (dev->net))
1146 urb = usb_alloc_urb (0, GFP_KERNEL);
1147 else
1148 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1149 if (urb != NULL) {
1150 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1151 status = usb_autopm_get_interface(dev->intf);
1152 if (status < 0) {
1153 usb_free_urb(urb);
1154 goto fail_lowmem;
1155 }
1156 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1157 resched = 0;
1158 usb_autopm_put_interface(dev->intf);
1159 fail_lowmem:
1160 if (resched)
1161 tasklet_schedule (&dev->bh);
1162 }
1163 }
1164
1165 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1166 struct driver_info *info = dev->driver_info;
1167 int retval = 0;
1168
1169 clear_bit (EVENT_LINK_RESET, &dev->flags);
1170 status = usb_autopm_get_interface(dev->intf);
1171 if (status < 0)
1172 goto skip_reset;
1173 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1174 usb_autopm_put_interface(dev->intf);
1175 skip_reset:
1176 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1177 retval,
1178 dev->udev->bus->bus_name,
1179 dev->udev->devpath,
1180 info->description);
1181 } else {
1182 usb_autopm_put_interface(dev->intf);
1183 }
1184
1185 /* handle link change from link resetting */
1186 __handle_link_change(dev);
1187 }
1188
1189 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1190 __handle_link_change(dev);
1191
1192 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1193 __handle_set_rx_mode(dev);
1194
1195
1196 if (dev->flags)
1197 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1198 }
1199
1200 /*-------------------------------------------------------------------------*/
1201
1202 static void tx_complete (struct urb *urb)
1203 {
1204 struct sk_buff *skb = (struct sk_buff *) urb->context;
1205 struct skb_data *entry = (struct skb_data *) skb->cb;
1206 struct usbnet *dev = entry->dev;
1207
1208 if (urb->status == 0) {
1209 dev->net->stats.tx_packets += entry->packets;
1210 dev->net->stats.tx_bytes += entry->length;
1211 } else {
1212 dev->net->stats.tx_errors++;
1213
1214 switch (urb->status) {
1215 case -EPIPE:
1216 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1217 break;
1218
1219 /* software-driven interface shutdown */
1220 case -ECONNRESET: // async unlink
1221 case -ESHUTDOWN: // hardware gone
1222 break;
1223
1224 /* like rx, tx gets controller i/o faults during hub_wq
1225 * delays and so it uses the same throttling mechanism.
1226 */
1227 case -EPROTO:
1228 case -ETIME:
1229 case -EILSEQ:
1230 usb_mark_last_busy(dev->udev);
1231 if (!timer_pending (&dev->delay)) {
1232 mod_timer (&dev->delay,
1233 jiffies + THROTTLE_JIFFIES);
1234 netif_dbg(dev, link, dev->net,
1235 "tx throttle %d\n", urb->status);
1236 }
1237 netif_stop_queue (dev->net);
1238 break;
1239 default:
1240 netif_dbg(dev, tx_err, dev->net,
1241 "tx err %d\n", entry->urb->status);
1242 break;
1243 }
1244 }
1245
1246 usb_autopm_put_interface_async(dev->intf);
1247 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1248 }
1249
1250 /*-------------------------------------------------------------------------*/
1251
1252 void usbnet_tx_timeout (struct net_device *net)
1253 {
1254 struct usbnet *dev = netdev_priv(net);
1255
1256 unlink_urbs (dev, &dev->txq);
1257 tasklet_schedule (&dev->bh);
1258 /* this needs to be handled individually because the generic layer
1259 * doesn't know what is sufficient and could not restore private
1260 * information if a remedy of an unconditional reset were used.
1261 */
1262 if (dev->driver_info->recover)
1263 (dev->driver_info->recover)(dev);
1264 }
1265 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1266
1267 /*-------------------------------------------------------------------------*/
1268
1269 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1270 {
1271 unsigned num_sgs, total_len = 0;
1272 int i, s = 0;
1273
1274 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1275 if (num_sgs == 1)
1276 return 0;
1277
1278 /* reserve one for zero packet */
1279 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1280 GFP_ATOMIC);
1281 if (!urb->sg)
1282 return -ENOMEM;
1283
1284 urb->num_sgs = num_sgs;
1285 sg_init_table(urb->sg, urb->num_sgs + 1);
1286
1287 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1288 total_len += skb_headlen(skb);
1289
1290 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1291 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1292
1293 total_len += skb_frag_size(f);
1294 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1295 f->page_offset);
1296 }
1297 urb->transfer_buffer_length = total_len;
1298
1299 return 1;
1300 }
1301
1302 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1303 struct net_device *net)
1304 {
1305 struct usbnet *dev = netdev_priv(net);
1306 unsigned int length;
1307 struct urb *urb = NULL;
1308 struct skb_data *entry;
1309 struct driver_info *info = dev->driver_info;
1310 unsigned long flags;
1311 int retval;
1312
1313 if (skb)
1314 skb_tx_timestamp(skb);
1315
1316 // some devices want funky USB-level framing, for
1317 // win32 driver (usually) and/or hardware quirks
1318 if (info->tx_fixup) {
1319 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1320 if (!skb) {
1321 /* packet collected; minidriver waiting for more */
1322 if (info->flags & FLAG_MULTI_PACKET)
1323 goto not_drop;
1324 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1325 goto drop;
1326 }
1327 }
1328
1329 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1330 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1331 goto drop;
1332 }
1333
1334 entry = (struct skb_data *) skb->cb;
1335 entry->urb = urb;
1336 entry->dev = dev;
1337
1338 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1339 skb->data, skb->len, tx_complete, skb);
1340 if (dev->can_dma_sg) {
1341 if (build_dma_sg(skb, urb) < 0)
1342 goto drop;
1343 }
1344 length = urb->transfer_buffer_length;
1345
1346 /* don't assume the hardware handles USB_ZERO_PACKET
1347 * NOTE: strictly conforming cdc-ether devices should expect
1348 * the ZLP here, but ignore the one-byte packet.
1349 * NOTE2: CDC NCM specification is different from CDC ECM when
1350 * handling ZLP/short packets, so cdc_ncm driver will make short
1351 * packet itself if needed.
1352 */
1353 if (length % dev->maxpacket == 0) {
1354 if (!(info->flags & FLAG_SEND_ZLP)) {
1355 if (!(info->flags & FLAG_MULTI_PACKET)) {
1356 length++;
1357 if (skb_tailroom(skb) && !urb->num_sgs) {
1358 skb->data[skb->len] = 0;
1359 __skb_put(skb, 1);
1360 } else if (urb->num_sgs)
1361 sg_set_buf(&urb->sg[urb->num_sgs++],
1362 dev->padding_pkt, 1);
1363 }
1364 } else
1365 urb->transfer_flags |= URB_ZERO_PACKET;
1366 }
1367 urb->transfer_buffer_length = length;
1368
1369 if (info->flags & FLAG_MULTI_PACKET) {
1370 /* Driver has set number of packets and a length delta.
1371 * Calculate the complete length and ensure that it's
1372 * positive.
1373 */
1374 entry->length += length;
1375 if (WARN_ON_ONCE(entry->length <= 0))
1376 entry->length = length;
1377 } else {
1378 usbnet_set_skb_tx_stats(skb, 1, length);
1379 }
1380
1381 spin_lock_irqsave(&dev->txq.lock, flags);
1382 retval = usb_autopm_get_interface_async(dev->intf);
1383 if (retval < 0) {
1384 spin_unlock_irqrestore(&dev->txq.lock, flags);
1385 goto drop;
1386 }
1387
1388 #ifdef CONFIG_PM
1389 /* if this triggers the device is still a sleep */
1390 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1391 /* transmission will be done in resume */
1392 usb_anchor_urb(urb, &dev->deferred);
1393 /* no use to process more packets */
1394 netif_stop_queue(net);
1395 usb_put_urb(urb);
1396 spin_unlock_irqrestore(&dev->txq.lock, flags);
1397 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1398 goto deferred;
1399 }
1400 #endif
1401
1402 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1403 case -EPIPE:
1404 netif_stop_queue (net);
1405 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1406 usb_autopm_put_interface_async(dev->intf);
1407 break;
1408 default:
1409 usb_autopm_put_interface_async(dev->intf);
1410 netif_dbg(dev, tx_err, dev->net,
1411 "tx: submit urb err %d\n", retval);
1412 break;
1413 case 0:
1414 net->trans_start = jiffies;
1415 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1416 if (dev->txq.qlen >= TX_QLEN (dev))
1417 netif_stop_queue (net);
1418 }
1419 spin_unlock_irqrestore (&dev->txq.lock, flags);
1420
1421 if (retval) {
1422 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1423 drop:
1424 dev->net->stats.tx_dropped++;
1425 not_drop:
1426 if (skb)
1427 dev_kfree_skb_any (skb);
1428 if (urb) {
1429 kfree(urb->sg);
1430 usb_free_urb(urb);
1431 }
1432 } else
1433 netif_dbg(dev, tx_queued, dev->net,
1434 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1435 #ifdef CONFIG_PM
1436 deferred:
1437 #endif
1438 return NETDEV_TX_OK;
1439 }
1440 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1441
1442 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1443 {
1444 struct urb *urb;
1445 int i;
1446 int ret = 0;
1447
1448 /* don't refill the queue all at once */
1449 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1450 urb = usb_alloc_urb(0, flags);
1451 if (urb != NULL) {
1452 ret = rx_submit(dev, urb, flags);
1453 if (ret)
1454 goto err;
1455 } else {
1456 ret = -ENOMEM;
1457 goto err;
1458 }
1459 }
1460 err:
1461 return ret;
1462 }
1463
1464 /*-------------------------------------------------------------------------*/
1465
1466 // tasklet (work deferred from completions, in_irq) or timer
1467
1468 static void usbnet_bh (unsigned long param)
1469 {
1470 struct usbnet *dev = (struct usbnet *) param;
1471 struct sk_buff *skb;
1472 struct skb_data *entry;
1473
1474 while ((skb = skb_dequeue (&dev->done))) {
1475 entry = (struct skb_data *) skb->cb;
1476 switch (entry->state) {
1477 case rx_done:
1478 entry->state = rx_cleanup;
1479 rx_process (dev, skb);
1480 continue;
1481 case tx_done:
1482 kfree(entry->urb->sg);
1483 case rx_cleanup:
1484 usb_free_urb (entry->urb);
1485 dev_kfree_skb (skb);
1486 continue;
1487 default:
1488 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1489 }
1490 }
1491
1492 /* restart RX again after disabling due to high error rate */
1493 clear_bit(EVENT_RX_KILL, &dev->flags);
1494
1495 /* waiting for all pending urbs to complete?
1496 * only then can we forgo submitting anew
1497 */
1498 if (waitqueue_active(&dev->wait)) {
1499 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1500 wake_up_all(&dev->wait);
1501
1502 // or are we maybe short a few urbs?
1503 } else if (netif_running (dev->net) &&
1504 netif_device_present (dev->net) &&
1505 netif_carrier_ok(dev->net) &&
1506 !timer_pending (&dev->delay) &&
1507 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1508 int temp = dev->rxq.qlen;
1509
1510 if (temp < RX_QLEN(dev)) {
1511 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1512 return;
1513 if (temp != dev->rxq.qlen)
1514 netif_dbg(dev, link, dev->net,
1515 "rxqlen %d --> %d\n",
1516 temp, dev->rxq.qlen);
1517 if (dev->rxq.qlen < RX_QLEN(dev))
1518 tasklet_schedule (&dev->bh);
1519 }
1520 if (dev->txq.qlen < TX_QLEN (dev))
1521 netif_wake_queue (dev->net);
1522 }
1523 }
1524
1525
1526 /*-------------------------------------------------------------------------
1527 *
1528 * USB Device Driver support
1529 *
1530 *-------------------------------------------------------------------------*/
1531
1532 // precondition: never called in_interrupt
1533
1534 void usbnet_disconnect (struct usb_interface *intf)
1535 {
1536 struct usbnet *dev;
1537 struct usb_device *xdev;
1538 struct net_device *net;
1539
1540 dev = usb_get_intfdata(intf);
1541 usb_set_intfdata(intf, NULL);
1542 if (!dev)
1543 return;
1544
1545 xdev = interface_to_usbdev (intf);
1546
1547 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1548 intf->dev.driver->name,
1549 xdev->bus->bus_name, xdev->devpath,
1550 dev->driver_info->description);
1551
1552 net = dev->net;
1553 unregister_netdev (net);
1554
1555 cancel_work_sync(&dev->kevent);
1556
1557 usb_scuttle_anchored_urbs(&dev->deferred);
1558
1559 if (dev->driver_info->unbind)
1560 dev->driver_info->unbind (dev, intf);
1561
1562 usb_kill_urb(dev->interrupt);
1563 usb_free_urb(dev->interrupt);
1564 kfree(dev->padding_pkt);
1565
1566 free_netdev(net);
1567 }
1568 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1569
1570 static const struct net_device_ops usbnet_netdev_ops = {
1571 .ndo_open = usbnet_open,
1572 .ndo_stop = usbnet_stop,
1573 .ndo_start_xmit = usbnet_start_xmit,
1574 .ndo_tx_timeout = usbnet_tx_timeout,
1575 .ndo_set_rx_mode = usbnet_set_rx_mode,
1576 .ndo_change_mtu = usbnet_change_mtu,
1577 .ndo_set_mac_address = eth_mac_addr,
1578 .ndo_validate_addr = eth_validate_addr,
1579 };
1580
1581 /*-------------------------------------------------------------------------*/
1582
1583 // precondition: never called in_interrupt
1584
1585 static struct device_type wlan_type = {
1586 .name = "wlan",
1587 };
1588
1589 static struct device_type wwan_type = {
1590 .name = "wwan",
1591 };
1592
1593 int
1594 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1595 {
1596 struct usbnet *dev;
1597 struct net_device *net;
1598 struct usb_host_interface *interface;
1599 struct driver_info *info;
1600 struct usb_device *xdev;
1601 int status;
1602 const char *name;
1603 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1604
1605 /* usbnet already took usb runtime pm, so have to enable the feature
1606 * for usb interface, otherwise usb_autopm_get_interface may return
1607 * failure if RUNTIME_PM is enabled.
1608 */
1609 if (!driver->supports_autosuspend) {
1610 driver->supports_autosuspend = 1;
1611 pm_runtime_enable(&udev->dev);
1612 }
1613
1614 name = udev->dev.driver->name;
1615 info = (struct driver_info *) prod->driver_info;
1616 if (!info) {
1617 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1618 return -ENODEV;
1619 }
1620 xdev = interface_to_usbdev (udev);
1621 interface = udev->cur_altsetting;
1622
1623 status = -ENOMEM;
1624
1625 // set up our own records
1626 net = alloc_etherdev(sizeof(*dev));
1627 if (!net)
1628 goto out;
1629
1630 /* netdev_printk() needs this so do it as early as possible */
1631 SET_NETDEV_DEV(net, &udev->dev);
1632
1633 dev = netdev_priv(net);
1634 dev->udev = xdev;
1635 dev->intf = udev;
1636 dev->driver_info = info;
1637 dev->driver_name = name;
1638 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1639 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1640 init_waitqueue_head(&dev->wait);
1641 skb_queue_head_init (&dev->rxq);
1642 skb_queue_head_init (&dev->txq);
1643 skb_queue_head_init (&dev->done);
1644 skb_queue_head_init(&dev->rxq_pause);
1645 dev->bh.func = usbnet_bh;
1646 dev->bh.data = (unsigned long) dev;
1647 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1648 init_usb_anchor(&dev->deferred);
1649 dev->delay.function = usbnet_bh;
1650 dev->delay.data = (unsigned long) dev;
1651 init_timer (&dev->delay);
1652 mutex_init (&dev->phy_mutex);
1653 mutex_init(&dev->interrupt_mutex);
1654 dev->interrupt_count = 0;
1655
1656 dev->net = net;
1657 strcpy (net->name, "usb%d");
1658 memcpy (net->dev_addr, node_id, sizeof node_id);
1659
1660 /* rx and tx sides can use different message sizes;
1661 * bind() should set rx_urb_size in that case.
1662 */
1663 dev->hard_mtu = net->mtu + net->hard_header_len;
1664 #if 0
1665 // dma_supported() is deeply broken on almost all architectures
1666 // possible with some EHCI controllers
1667 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1668 net->features |= NETIF_F_HIGHDMA;
1669 #endif
1670
1671 net->netdev_ops = &usbnet_netdev_ops;
1672 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1673 net->ethtool_ops = &usbnet_ethtool_ops;
1674
1675 // allow device-specific bind/init procedures
1676 // NOTE net->name still not usable ...
1677 if (info->bind) {
1678 status = info->bind (dev, udev);
1679 if (status < 0)
1680 goto out1;
1681
1682 // heuristic: "usb%d" for links we know are two-host,
1683 // else "eth%d" when there's reasonable doubt. userspace
1684 // can rename the link if it knows better.
1685 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1686 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1687 (net->dev_addr [0] & 0x02) == 0))
1688 strcpy (net->name, "eth%d");
1689 /* WLAN devices should always be named "wlan%d" */
1690 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1691 strcpy(net->name, "wlan%d");
1692 /* WWAN devices should always be named "wwan%d" */
1693 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1694 strcpy(net->name, "wwan%d");
1695
1696 /* devices that cannot do ARP */
1697 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1698 net->flags |= IFF_NOARP;
1699
1700 /* maybe the remote can't receive an Ethernet MTU */
1701 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1702 net->mtu = dev->hard_mtu - net->hard_header_len;
1703 } else if (!info->in || !info->out)
1704 status = usbnet_get_endpoints (dev, udev);
1705 else {
1706 dev->in = usb_rcvbulkpipe (xdev, info->in);
1707 dev->out = usb_sndbulkpipe (xdev, info->out);
1708 if (!(info->flags & FLAG_NO_SETINT))
1709 status = usb_set_interface (xdev,
1710 interface->desc.bInterfaceNumber,
1711 interface->desc.bAlternateSetting);
1712 else
1713 status = 0;
1714
1715 }
1716 if (status >= 0 && dev->status)
1717 status = init_status (dev, udev);
1718 if (status < 0)
1719 goto out3;
1720
1721 if (!dev->rx_urb_size)
1722 dev->rx_urb_size = dev->hard_mtu;
1723 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1724
1725 /* let userspace know we have a random address */
1726 if (ether_addr_equal(net->dev_addr, node_id))
1727 net->addr_assign_type = NET_ADDR_RANDOM;
1728
1729 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1730 SET_NETDEV_DEVTYPE(net, &wlan_type);
1731 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1732 SET_NETDEV_DEVTYPE(net, &wwan_type);
1733
1734 /* initialize max rx_qlen and tx_qlen */
1735 usbnet_update_max_qlen(dev);
1736
1737 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1738 !(info->flags & FLAG_MULTI_PACKET)) {
1739 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1740 if (!dev->padding_pkt) {
1741 status = -ENOMEM;
1742 goto out4;
1743 }
1744 }
1745
1746 status = register_netdev (net);
1747 if (status)
1748 goto out5;
1749 netif_info(dev, probe, dev->net,
1750 "register '%s' at usb-%s-%s, %s, %pM\n",
1751 udev->dev.driver->name,
1752 xdev->bus->bus_name, xdev->devpath,
1753 dev->driver_info->description,
1754 net->dev_addr);
1755
1756 // ok, it's ready to go.
1757 usb_set_intfdata (udev, dev);
1758
1759 netif_device_attach (net);
1760
1761 if (dev->driver_info->flags & FLAG_LINK_INTR)
1762 usbnet_link_change(dev, 0, 0);
1763
1764 return 0;
1765
1766 out5:
1767 kfree(dev->padding_pkt);
1768 out4:
1769 usb_free_urb(dev->interrupt);
1770 out3:
1771 if (info->unbind)
1772 info->unbind (dev, udev);
1773 out1:
1774 free_netdev(net);
1775 out:
1776 return status;
1777 }
1778 EXPORT_SYMBOL_GPL(usbnet_probe);
1779
1780 /*-------------------------------------------------------------------------*/
1781
1782 /*
1783 * suspend the whole driver as soon as the first interface is suspended
1784 * resume only when the last interface is resumed
1785 */
1786
1787 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1788 {
1789 struct usbnet *dev = usb_get_intfdata(intf);
1790
1791 if (!dev->suspend_count++) {
1792 spin_lock_irq(&dev->txq.lock);
1793 /* don't autosuspend while transmitting */
1794 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1795 dev->suspend_count--;
1796 spin_unlock_irq(&dev->txq.lock);
1797 return -EBUSY;
1798 } else {
1799 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1800 spin_unlock_irq(&dev->txq.lock);
1801 }
1802 /*
1803 * accelerate emptying of the rx and queues, to avoid
1804 * having everything error out.
1805 */
1806 netif_device_detach (dev->net);
1807 usbnet_terminate_urbs(dev);
1808 __usbnet_status_stop_force(dev);
1809
1810 /*
1811 * reattach so runtime management can use and
1812 * wake the device
1813 */
1814 netif_device_attach (dev->net);
1815 }
1816 return 0;
1817 }
1818 EXPORT_SYMBOL_GPL(usbnet_suspend);
1819
1820 int usbnet_resume (struct usb_interface *intf)
1821 {
1822 struct usbnet *dev = usb_get_intfdata(intf);
1823 struct sk_buff *skb;
1824 struct urb *res;
1825 int retval;
1826
1827 if (!--dev->suspend_count) {
1828 /* resume interrupt URB if it was previously submitted */
1829 __usbnet_status_start_force(dev, GFP_NOIO);
1830
1831 spin_lock_irq(&dev->txq.lock);
1832 while ((res = usb_get_from_anchor(&dev->deferred))) {
1833
1834 skb = (struct sk_buff *)res->context;
1835 retval = usb_submit_urb(res, GFP_ATOMIC);
1836 if (retval < 0) {
1837 dev_kfree_skb_any(skb);
1838 kfree(res->sg);
1839 usb_free_urb(res);
1840 usb_autopm_put_interface_async(dev->intf);
1841 } else {
1842 dev->net->trans_start = jiffies;
1843 __skb_queue_tail(&dev->txq, skb);
1844 }
1845 }
1846
1847 smp_mb();
1848 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1849 spin_unlock_irq(&dev->txq.lock);
1850
1851 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1852 /* handle remote wakeup ASAP
1853 * we cannot race against stop
1854 */
1855 if (netif_device_present(dev->net) &&
1856 !timer_pending(&dev->delay) &&
1857 !test_bit(EVENT_RX_HALT, &dev->flags))
1858 rx_alloc_submit(dev, GFP_NOIO);
1859
1860 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1861 netif_tx_wake_all_queues(dev->net);
1862 tasklet_schedule (&dev->bh);
1863 }
1864 }
1865
1866 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1867 usb_autopm_get_interface_no_resume(intf);
1868
1869 return 0;
1870 }
1871 EXPORT_SYMBOL_GPL(usbnet_resume);
1872
1873 /*
1874 * Either a subdriver implements manage_power, then it is assumed to always
1875 * be ready to be suspended or it reports the readiness to be suspended
1876 * explicitly
1877 */
1878 void usbnet_device_suggests_idle(struct usbnet *dev)
1879 {
1880 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1881 dev->intf->needs_remote_wakeup = 1;
1882 usb_autopm_put_interface_async(dev->intf);
1883 }
1884 }
1885 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1886
1887 /*
1888 * For devices that can do without special commands
1889 */
1890 int usbnet_manage_power(struct usbnet *dev, int on)
1891 {
1892 dev->intf->needs_remote_wakeup = on;
1893 return 0;
1894 }
1895 EXPORT_SYMBOL(usbnet_manage_power);
1896
1897 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1898 {
1899 /* update link after link is reseted */
1900 if (link && !need_reset)
1901 netif_carrier_on(dev->net);
1902 else
1903 netif_carrier_off(dev->net);
1904
1905 if (need_reset && link)
1906 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1907 else
1908 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1909 }
1910 EXPORT_SYMBOL(usbnet_link_change);
1911
1912 /*-------------------------------------------------------------------------*/
1913 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1914 u16 value, u16 index, void *data, u16 size)
1915 {
1916 void *buf = NULL;
1917 int err = -ENOMEM;
1918
1919 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1920 " value=0x%04x index=0x%04x size=%d\n",
1921 cmd, reqtype, value, index, size);
1922
1923 if (data) {
1924 buf = kmalloc(size, GFP_KERNEL);
1925 if (!buf)
1926 goto out;
1927 }
1928
1929 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1930 cmd, reqtype, value, index, buf, size,
1931 USB_CTRL_GET_TIMEOUT);
1932 if (err > 0 && err <= size)
1933 memcpy(data, buf, err);
1934 kfree(buf);
1935 out:
1936 return err;
1937 }
1938
1939 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1940 u16 value, u16 index, const void *data,
1941 u16 size)
1942 {
1943 void *buf = NULL;
1944 int err = -ENOMEM;
1945
1946 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1947 " value=0x%04x index=0x%04x size=%d\n",
1948 cmd, reqtype, value, index, size);
1949
1950 if (data) {
1951 buf = kmemdup(data, size, GFP_KERNEL);
1952 if (!buf)
1953 goto out;
1954 }
1955
1956 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1957 cmd, reqtype, value, index, buf, size,
1958 USB_CTRL_SET_TIMEOUT);
1959 kfree(buf);
1960
1961 out:
1962 return err;
1963 }
1964
1965 /*
1966 * The function can't be called inside suspend/resume callback,
1967 * otherwise deadlock will be caused.
1968 */
1969 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1970 u16 value, u16 index, void *data, u16 size)
1971 {
1972 int ret;
1973
1974 if (usb_autopm_get_interface(dev->intf) < 0)
1975 return -ENODEV;
1976 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1977 data, size);
1978 usb_autopm_put_interface(dev->intf);
1979 return ret;
1980 }
1981 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1982
1983 /*
1984 * The function can't be called inside suspend/resume callback,
1985 * otherwise deadlock will be caused.
1986 */
1987 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1988 u16 value, u16 index, const void *data, u16 size)
1989 {
1990 int ret;
1991
1992 if (usb_autopm_get_interface(dev->intf) < 0)
1993 return -ENODEV;
1994 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1995 data, size);
1996 usb_autopm_put_interface(dev->intf);
1997 return ret;
1998 }
1999 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2000
2001 /*
2002 * The function can be called inside suspend/resume callback safely
2003 * and should only be called by suspend/resume callback generally.
2004 */
2005 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2006 u16 value, u16 index, void *data, u16 size)
2007 {
2008 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2009 data, size);
2010 }
2011 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2012
2013 /*
2014 * The function can be called inside suspend/resume callback safely
2015 * and should only be called by suspend/resume callback generally.
2016 */
2017 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2018 u16 value, u16 index, const void *data,
2019 u16 size)
2020 {
2021 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2022 data, size);
2023 }
2024 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2025
2026 static void usbnet_async_cmd_cb(struct urb *urb)
2027 {
2028 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2029 int status = urb->status;
2030
2031 if (status < 0)
2032 dev_dbg(&urb->dev->dev, "%s failed with %d",
2033 __func__, status);
2034
2035 kfree(req);
2036 usb_free_urb(urb);
2037 }
2038
2039 /*
2040 * The caller must make sure that device can't be put into suspend
2041 * state until the control URB completes.
2042 */
2043 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2044 u16 value, u16 index, const void *data, u16 size)
2045 {
2046 struct usb_ctrlrequest *req = NULL;
2047 struct urb *urb;
2048 int err = -ENOMEM;
2049 void *buf = NULL;
2050
2051 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2052 " value=0x%04x index=0x%04x size=%d\n",
2053 cmd, reqtype, value, index, size);
2054
2055 urb = usb_alloc_urb(0, GFP_ATOMIC);
2056 if (!urb) {
2057 netdev_err(dev->net, "Error allocating URB in"
2058 " %s!\n", __func__);
2059 goto fail;
2060 }
2061
2062 if (data) {
2063 buf = kmemdup(data, size, GFP_ATOMIC);
2064 if (!buf) {
2065 netdev_err(dev->net, "Error allocating buffer"
2066 " in %s!\n", __func__);
2067 goto fail_free;
2068 }
2069 }
2070
2071 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2072 if (!req)
2073 goto fail_free_buf;
2074
2075 req->bRequestType = reqtype;
2076 req->bRequest = cmd;
2077 req->wValue = cpu_to_le16(value);
2078 req->wIndex = cpu_to_le16(index);
2079 req->wLength = cpu_to_le16(size);
2080
2081 usb_fill_control_urb(urb, dev->udev,
2082 usb_sndctrlpipe(dev->udev, 0),
2083 (void *)req, buf, size,
2084 usbnet_async_cmd_cb, req);
2085 urb->transfer_flags |= URB_FREE_BUFFER;
2086
2087 err = usb_submit_urb(urb, GFP_ATOMIC);
2088 if (err < 0) {
2089 netdev_err(dev->net, "Error submitting the control"
2090 " message: status=%d\n", err);
2091 goto fail_free;
2092 }
2093 return 0;
2094
2095 fail_free_buf:
2096 kfree(buf);
2097 fail_free:
2098 kfree(req);
2099 usb_free_urb(urb);
2100 fail:
2101 return err;
2102
2103 }
2104 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2105 /*-------------------------------------------------------------------------*/
2106
2107 static int __init usbnet_init(void)
2108 {
2109 /* Compiler should optimize this out. */
2110 BUILD_BUG_ON(
2111 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2112
2113 eth_random_addr(node_id);
2114 return 0;
2115 }
2116 module_init(usbnet_init);
2117
2118 static void __exit usbnet_exit(void)
2119 {
2120 }
2121 module_exit(usbnet_exit);
2122
2123 MODULE_AUTHOR("David Brownell");
2124 MODULE_DESCRIPTION("USB network driver framework");
2125 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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