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spi-imx: Implements handling of the SPI_READY mode flag.
[mirror_ubuntu-bionic-kernel.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 /* 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 // no second zero-length packet read wanted after mtu-sized packets
388 if ((ll_mtu % dev->maxpacket) == 0)
389 return -EDOM;
390 net->mtu = new_mtu;
391
392 dev->hard_mtu = net->mtu + net->hard_header_len;
393 if (dev->rx_urb_size == old_hard_mtu) {
394 dev->rx_urb_size = dev->hard_mtu;
395 if (dev->rx_urb_size > old_rx_urb_size) {
396 usbnet_pause_rx(dev);
397 usbnet_unlink_rx_urbs(dev);
398 usbnet_resume_rx(dev);
399 }
400 }
401
402 /* max qlen depend on hard_mtu and rx_urb_size */
403 usbnet_update_max_qlen(dev);
404
405 return 0;
406 }
407 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
408
409 /* The caller must hold list->lock */
410 static void __usbnet_queue_skb(struct sk_buff_head *list,
411 struct sk_buff *newsk, enum skb_state state)
412 {
413 struct skb_data *entry = (struct skb_data *) newsk->cb;
414
415 __skb_queue_tail(list, newsk);
416 entry->state = state;
417 }
418
419 /*-------------------------------------------------------------------------*/
420
421 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
422 * completion callbacks. 2.5 should have fixed those bugs...
423 */
424
425 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
426 struct sk_buff_head *list, enum skb_state state)
427 {
428 unsigned long flags;
429 enum skb_state old_state;
430 struct skb_data *entry = (struct skb_data *) skb->cb;
431
432 spin_lock_irqsave(&list->lock, flags);
433 old_state = entry->state;
434 entry->state = state;
435 __skb_unlink(skb, list);
436
437 /* defer_bh() is never called with list == &dev->done.
438 * spin_lock_nested() tells lockdep that it is OK to take
439 * dev->done.lock here with list->lock held.
440 */
441 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
442
443 __skb_queue_tail(&dev->done, skb);
444 if (dev->done.qlen == 1)
445 tasklet_schedule(&dev->bh);
446 spin_unlock(&dev->done.lock);
447 spin_unlock_irqrestore(&list->lock, flags);
448 return old_state;
449 }
450
451 /* some work can't be done in tasklets, so we use keventd
452 *
453 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
454 * but tasklet_schedule() doesn't. hope the failure is rare.
455 */
456 void usbnet_defer_kevent (struct usbnet *dev, int work)
457 {
458 set_bit (work, &dev->flags);
459 if (!schedule_work (&dev->kevent)) {
460 if (net_ratelimit())
461 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
462 } else {
463 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
464 }
465 }
466 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
467
468 /*-------------------------------------------------------------------------*/
469
470 static void rx_complete (struct urb *urb);
471
472 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
473 {
474 struct sk_buff *skb;
475 struct skb_data *entry;
476 int retval = 0;
477 unsigned long lockflags;
478 size_t size = dev->rx_urb_size;
479
480 /* prevent rx skb allocation when error ratio is high */
481 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
482 usb_free_urb(urb);
483 return -ENOLINK;
484 }
485
486 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
487 if (!skb) {
488 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
489 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
490 usb_free_urb (urb);
491 return -ENOMEM;
492 }
493
494 entry = (struct skb_data *) skb->cb;
495 entry->urb = urb;
496 entry->dev = dev;
497 entry->length = 0;
498
499 usb_fill_bulk_urb (urb, dev->udev, dev->in,
500 skb->data, size, rx_complete, skb);
501
502 spin_lock_irqsave (&dev->rxq.lock, lockflags);
503
504 if (netif_running (dev->net) &&
505 netif_device_present (dev->net) &&
506 !test_bit (EVENT_RX_HALT, &dev->flags) &&
507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
509 case -EPIPE:
510 usbnet_defer_kevent (dev, EVENT_RX_HALT);
511 break;
512 case -ENOMEM:
513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
514 break;
515 case -ENODEV:
516 netif_dbg(dev, ifdown, dev->net, "device gone\n");
517 netif_device_detach (dev->net);
518 break;
519 case -EHOSTUNREACH:
520 retval = -ENOLINK;
521 break;
522 default:
523 netif_dbg(dev, rx_err, dev->net,
524 "rx submit, %d\n", retval);
525 tasklet_schedule (&dev->bh);
526 break;
527 case 0:
528 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
529 }
530 } else {
531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
532 retval = -ENOLINK;
533 }
534 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
535 if (retval) {
536 dev_kfree_skb_any (skb);
537 usb_free_urb (urb);
538 }
539 return retval;
540 }
541
542
543 /*-------------------------------------------------------------------------*/
544
545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
546 {
547 if (dev->driver_info->rx_fixup &&
548 !dev->driver_info->rx_fixup (dev, skb)) {
549 /* With RX_ASSEMBLE, rx_fixup() must update counters */
550 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
551 dev->net->stats.rx_errors++;
552 goto done;
553 }
554 // else network stack removes extra byte if we forced a short packet
555
556 /* all data was already cloned from skb inside the driver */
557 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
558 goto done;
559
560 if (skb->len < ETH_HLEN) {
561 dev->net->stats.rx_errors++;
562 dev->net->stats.rx_length_errors++;
563 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
564 } else {
565 usbnet_skb_return(dev, skb);
566 return;
567 }
568
569 done:
570 skb_queue_tail(&dev->done, skb);
571 }
572
573 /*-------------------------------------------------------------------------*/
574
575 static void rx_complete (struct urb *urb)
576 {
577 struct sk_buff *skb = (struct sk_buff *) urb->context;
578 struct skb_data *entry = (struct skb_data *) skb->cb;
579 struct usbnet *dev = entry->dev;
580 int urb_status = urb->status;
581 enum skb_state state;
582
583 skb_put (skb, urb->actual_length);
584 state = rx_done;
585 entry->urb = NULL;
586
587 switch (urb_status) {
588 /* success */
589 case 0:
590 break;
591
592 /* stalls need manual reset. this is rare ... except that
593 * when going through USB 2.0 TTs, unplug appears this way.
594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
595 * storm, recovering as needed.
596 */
597 case -EPIPE:
598 dev->net->stats.rx_errors++;
599 usbnet_defer_kevent (dev, EVENT_RX_HALT);
600 // FALLTHROUGH
601
602 /* software-driven interface shutdown */
603 case -ECONNRESET: /* async unlink */
604 case -ESHUTDOWN: /* hardware gone */
605 netif_dbg(dev, ifdown, dev->net,
606 "rx shutdown, code %d\n", urb_status);
607 goto block;
608
609 /* we get controller i/o faults during hub_wq disconnect() delays.
610 * throttle down resubmits, to avoid log floods; just temporarily,
611 * so we still recover when the fault isn't a hub_wq delay.
612 */
613 case -EPROTO:
614 case -ETIME:
615 case -EILSEQ:
616 dev->net->stats.rx_errors++;
617 if (!timer_pending (&dev->delay)) {
618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
619 netif_dbg(dev, link, dev->net,
620 "rx throttle %d\n", urb_status);
621 }
622 block:
623 state = rx_cleanup;
624 entry->urb = urb;
625 urb = NULL;
626 break;
627
628 /* data overrun ... flush fifo? */
629 case -EOVERFLOW:
630 dev->net->stats.rx_over_errors++;
631 // FALLTHROUGH
632
633 default:
634 state = rx_cleanup;
635 dev->net->stats.rx_errors++;
636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
637 break;
638 }
639
640 /* stop rx if packet error rate is high */
641 if (++dev->pkt_cnt > 30) {
642 dev->pkt_cnt = 0;
643 dev->pkt_err = 0;
644 } else {
645 if (state == rx_cleanup)
646 dev->pkt_err++;
647 if (dev->pkt_err > 20)
648 set_bit(EVENT_RX_KILL, &dev->flags);
649 }
650
651 state = defer_bh(dev, skb, &dev->rxq, state);
652
653 if (urb) {
654 if (netif_running (dev->net) &&
655 !test_bit (EVENT_RX_HALT, &dev->flags) &&
656 state != unlink_start) {
657 rx_submit (dev, urb, GFP_ATOMIC);
658 usb_mark_last_busy(dev->udev);
659 return;
660 }
661 usb_free_urb (urb);
662 }
663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
664 }
665
666 /*-------------------------------------------------------------------------*/
667 void usbnet_pause_rx(struct usbnet *dev)
668 {
669 set_bit(EVENT_RX_PAUSED, &dev->flags);
670
671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
672 }
673 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
674
675 void usbnet_resume_rx(struct usbnet *dev)
676 {
677 struct sk_buff *skb;
678 int num = 0;
679
680 clear_bit(EVENT_RX_PAUSED, &dev->flags);
681
682 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
683 usbnet_skb_return(dev, skb);
684 num++;
685 }
686
687 tasklet_schedule(&dev->bh);
688
689 netif_dbg(dev, rx_status, dev->net,
690 "paused rx queue disabled, %d skbs requeued\n", num);
691 }
692 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
693
694 void usbnet_purge_paused_rxq(struct usbnet *dev)
695 {
696 skb_queue_purge(&dev->rxq_pause);
697 }
698 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
699
700 /*-------------------------------------------------------------------------*/
701
702 // unlink pending rx/tx; completion handlers do all other cleanup
703
704 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
705 {
706 unsigned long flags;
707 struct sk_buff *skb;
708 int count = 0;
709
710 spin_lock_irqsave (&q->lock, flags);
711 while (!skb_queue_empty(q)) {
712 struct skb_data *entry;
713 struct urb *urb;
714 int retval;
715
716 skb_queue_walk(q, skb) {
717 entry = (struct skb_data *) skb->cb;
718 if (entry->state != unlink_start)
719 goto found;
720 }
721 break;
722 found:
723 entry->state = unlink_start;
724 urb = entry->urb;
725
726 /*
727 * Get reference count of the URB to avoid it to be
728 * freed during usb_unlink_urb, which may trigger
729 * use-after-free problem inside usb_unlink_urb since
730 * usb_unlink_urb is always racing with .complete
731 * handler(include defer_bh).
732 */
733 usb_get_urb(urb);
734 spin_unlock_irqrestore(&q->lock, flags);
735 // during some PM-driven resume scenarios,
736 // these (async) unlinks complete immediately
737 retval = usb_unlink_urb (urb);
738 if (retval != -EINPROGRESS && retval != 0)
739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
740 else
741 count++;
742 usb_put_urb(urb);
743 spin_lock_irqsave(&q->lock, flags);
744 }
745 spin_unlock_irqrestore (&q->lock, flags);
746 return count;
747 }
748
749 // Flush all pending rx urbs
750 // minidrivers may need to do this when the MTU changes
751
752 void usbnet_unlink_rx_urbs(struct usbnet *dev)
753 {
754 if (netif_running(dev->net)) {
755 (void) unlink_urbs (dev, &dev->rxq);
756 tasklet_schedule(&dev->bh);
757 }
758 }
759 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
760
761 /*-------------------------------------------------------------------------*/
762
763 static void wait_skb_queue_empty(struct sk_buff_head *q)
764 {
765 unsigned long flags;
766
767 spin_lock_irqsave(&q->lock, flags);
768 while (!skb_queue_empty(q)) {
769 spin_unlock_irqrestore(&q->lock, flags);
770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
771 set_current_state(TASK_UNINTERRUPTIBLE);
772 spin_lock_irqsave(&q->lock, flags);
773 }
774 spin_unlock_irqrestore(&q->lock, flags);
775 }
776
777 // precondition: never called in_interrupt
778 static void usbnet_terminate_urbs(struct usbnet *dev)
779 {
780 DECLARE_WAITQUEUE(wait, current);
781 int temp;
782
783 /* ensure there are no more active urbs */
784 add_wait_queue(&dev->wait, &wait);
785 set_current_state(TASK_UNINTERRUPTIBLE);
786 temp = unlink_urbs(dev, &dev->txq) +
787 unlink_urbs(dev, &dev->rxq);
788
789 /* maybe wait for deletions to finish. */
790 wait_skb_queue_empty(&dev->rxq);
791 wait_skb_queue_empty(&dev->txq);
792 wait_skb_queue_empty(&dev->done);
793 netif_dbg(dev, ifdown, dev->net,
794 "waited for %d urb completions\n", temp);
795 set_current_state(TASK_RUNNING);
796 remove_wait_queue(&dev->wait, &wait);
797 }
798
799 int usbnet_stop (struct net_device *net)
800 {
801 struct usbnet *dev = netdev_priv(net);
802 struct driver_info *info = dev->driver_info;
803 int retval, pm, mpn;
804
805 clear_bit(EVENT_DEV_OPEN, &dev->flags);
806 netif_stop_queue (net);
807
808 netif_info(dev, ifdown, dev->net,
809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
810 net->stats.rx_packets, net->stats.tx_packets,
811 net->stats.rx_errors, net->stats.tx_errors);
812
813 /* to not race resume */
814 pm = usb_autopm_get_interface(dev->intf);
815 /* allow minidriver to stop correctly (wireless devices to turn off
816 * radio etc) */
817 if (info->stop) {
818 retval = info->stop(dev);
819 if (retval < 0)
820 netif_info(dev, ifdown, dev->net,
821 "stop fail (%d) usbnet usb-%s-%s, %s\n",
822 retval,
823 dev->udev->bus->bus_name, dev->udev->devpath,
824 info->description);
825 }
826
827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
828 usbnet_terminate_urbs(dev);
829
830 usbnet_status_stop(dev);
831
832 usbnet_purge_paused_rxq(dev);
833
834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
835
836 /* deferred work (task, timer, softirq) must also stop.
837 * can't flush_scheduled_work() until we drop rtnl (later),
838 * else workers could deadlock; so make workers a NOP.
839 */
840 dev->flags = 0;
841 del_timer_sync (&dev->delay);
842 tasklet_kill (&dev->bh);
843 if (!pm)
844 usb_autopm_put_interface(dev->intf);
845
846 if (info->manage_power && mpn)
847 info->manage_power(dev, 0);
848 else
849 usb_autopm_put_interface(dev->intf);
850
851 return 0;
852 }
853 EXPORT_SYMBOL_GPL(usbnet_stop);
854
855 /*-------------------------------------------------------------------------*/
856
857 // posts reads, and enables write queuing
858
859 // precondition: never called in_interrupt
860
861 int usbnet_open (struct net_device *net)
862 {
863 struct usbnet *dev = netdev_priv(net);
864 int retval;
865 struct driver_info *info = dev->driver_info;
866
867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
868 netif_info(dev, ifup, dev->net,
869 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
870 retval,
871 dev->udev->bus->bus_name,
872 dev->udev->devpath,
873 info->description);
874 goto done_nopm;
875 }
876
877 // put into "known safe" state
878 if (info->reset && (retval = info->reset (dev)) < 0) {
879 netif_info(dev, ifup, dev->net,
880 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
881 retval,
882 dev->udev->bus->bus_name,
883 dev->udev->devpath,
884 info->description);
885 goto done;
886 }
887
888 /* hard_mtu or rx_urb_size may change in reset() */
889 usbnet_update_max_qlen(dev);
890
891 // insist peer be connected
892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
894 goto done;
895 }
896
897 /* start any status interrupt transfer */
898 if (dev->interrupt) {
899 retval = usbnet_status_start(dev, GFP_KERNEL);
900 if (retval < 0) {
901 netif_err(dev, ifup, dev->net,
902 "intr submit %d\n", retval);
903 goto done;
904 }
905 }
906
907 set_bit(EVENT_DEV_OPEN, &dev->flags);
908 netif_start_queue (net);
909 netif_info(dev, ifup, dev->net,
910 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
911 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
912 dev->net->mtu,
913 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
914 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
915 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
916 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
917 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
918 "simple");
919
920 /* reset rx error state */
921 dev->pkt_cnt = 0;
922 dev->pkt_err = 0;
923 clear_bit(EVENT_RX_KILL, &dev->flags);
924
925 // delay posting reads until we're fully open
926 tasklet_schedule (&dev->bh);
927 if (info->manage_power) {
928 retval = info->manage_power(dev, 1);
929 if (retval < 0) {
930 retval = 0;
931 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
932 } else {
933 usb_autopm_put_interface(dev->intf);
934 }
935 }
936 return retval;
937 done:
938 usb_autopm_put_interface(dev->intf);
939 done_nopm:
940 return retval;
941 }
942 EXPORT_SYMBOL_GPL(usbnet_open);
943
944 /*-------------------------------------------------------------------------*/
945
946 /* ethtool methods; minidrivers may need to add some more, but
947 * they'll probably want to use this base set.
948 */
949
950 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
951 {
952 struct usbnet *dev = netdev_priv(net);
953
954 if (!dev->mii.mdio_read)
955 return -EOPNOTSUPP;
956
957 return mii_ethtool_gset(&dev->mii, cmd);
958 }
959 EXPORT_SYMBOL_GPL(usbnet_get_settings);
960
961 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
962 {
963 struct usbnet *dev = netdev_priv(net);
964 int retval;
965
966 if (!dev->mii.mdio_write)
967 return -EOPNOTSUPP;
968
969 retval = mii_ethtool_sset(&dev->mii, cmd);
970
971 /* link speed/duplex might have changed */
972 if (dev->driver_info->link_reset)
973 dev->driver_info->link_reset(dev);
974
975 /* hard_mtu or rx_urb_size may change in link_reset() */
976 usbnet_update_max_qlen(dev);
977
978 return retval;
979
980 }
981 EXPORT_SYMBOL_GPL(usbnet_set_settings);
982
983 u32 usbnet_get_link (struct net_device *net)
984 {
985 struct usbnet *dev = netdev_priv(net);
986
987 /* If a check_connect is defined, return its result */
988 if (dev->driver_info->check_connect)
989 return dev->driver_info->check_connect (dev) == 0;
990
991 /* if the device has mii operations, use those */
992 if (dev->mii.mdio_read)
993 return mii_link_ok(&dev->mii);
994
995 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
996 return ethtool_op_get_link(net);
997 }
998 EXPORT_SYMBOL_GPL(usbnet_get_link);
999
1000 int usbnet_nway_reset(struct net_device *net)
1001 {
1002 struct usbnet *dev = netdev_priv(net);
1003
1004 if (!dev->mii.mdio_write)
1005 return -EOPNOTSUPP;
1006
1007 return mii_nway_restart(&dev->mii);
1008 }
1009 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1010
1011 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1012 {
1013 struct usbnet *dev = netdev_priv(net);
1014
1015 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1016 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1017 strlcpy (info->fw_version, dev->driver_info->description,
1018 sizeof info->fw_version);
1019 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1020 }
1021 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1022
1023 u32 usbnet_get_msglevel (struct net_device *net)
1024 {
1025 struct usbnet *dev = netdev_priv(net);
1026
1027 return dev->msg_enable;
1028 }
1029 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1030
1031 void usbnet_set_msglevel (struct net_device *net, u32 level)
1032 {
1033 struct usbnet *dev = netdev_priv(net);
1034
1035 dev->msg_enable = level;
1036 }
1037 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1038
1039 /* drivers may override default ethtool_ops in their bind() routine */
1040 static const struct ethtool_ops usbnet_ethtool_ops = {
1041 .get_settings = usbnet_get_settings,
1042 .set_settings = usbnet_set_settings,
1043 .get_link = usbnet_get_link,
1044 .nway_reset = usbnet_nway_reset,
1045 .get_drvinfo = usbnet_get_drvinfo,
1046 .get_msglevel = usbnet_get_msglevel,
1047 .set_msglevel = usbnet_set_msglevel,
1048 .get_ts_info = ethtool_op_get_ts_info,
1049 };
1050
1051 /*-------------------------------------------------------------------------*/
1052
1053 static void __handle_link_change(struct usbnet *dev)
1054 {
1055 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1056 return;
1057
1058 if (!netif_carrier_ok(dev->net)) {
1059 /* kill URBs for reading packets to save bus bandwidth */
1060 unlink_urbs(dev, &dev->rxq);
1061
1062 /*
1063 * tx_timeout will unlink URBs for sending packets and
1064 * tx queue is stopped by netcore after link becomes off
1065 */
1066 } else {
1067 /* submitting URBs for reading packets */
1068 tasklet_schedule(&dev->bh);
1069 }
1070
1071 /* hard_mtu or rx_urb_size may change during link change */
1072 usbnet_update_max_qlen(dev);
1073
1074 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1075 }
1076
1077 static void usbnet_set_rx_mode(struct net_device *net)
1078 {
1079 struct usbnet *dev = netdev_priv(net);
1080
1081 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1082 }
1083
1084 static void __handle_set_rx_mode(struct usbnet *dev)
1085 {
1086 if (dev->driver_info->set_rx_mode)
1087 (dev->driver_info->set_rx_mode)(dev);
1088
1089 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1090 }
1091
1092 /* work that cannot be done in interrupt context uses keventd.
1093 *
1094 * NOTE: with 2.5 we could do more of this using completion callbacks,
1095 * especially now that control transfers can be queued.
1096 */
1097 static void
1098 usbnet_deferred_kevent (struct work_struct *work)
1099 {
1100 struct usbnet *dev =
1101 container_of(work, struct usbnet, kevent);
1102 int status;
1103
1104 /* usb_clear_halt() needs a thread context */
1105 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1106 unlink_urbs (dev, &dev->txq);
1107 status = usb_autopm_get_interface(dev->intf);
1108 if (status < 0)
1109 goto fail_pipe;
1110 status = usb_clear_halt (dev->udev, dev->out);
1111 usb_autopm_put_interface(dev->intf);
1112 if (status < 0 &&
1113 status != -EPIPE &&
1114 status != -ESHUTDOWN) {
1115 if (netif_msg_tx_err (dev))
1116 fail_pipe:
1117 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1118 status);
1119 } else {
1120 clear_bit (EVENT_TX_HALT, &dev->flags);
1121 if (status != -ESHUTDOWN)
1122 netif_wake_queue (dev->net);
1123 }
1124 }
1125 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1126 unlink_urbs (dev, &dev->rxq);
1127 status = usb_autopm_get_interface(dev->intf);
1128 if (status < 0)
1129 goto fail_halt;
1130 status = usb_clear_halt (dev->udev, dev->in);
1131 usb_autopm_put_interface(dev->intf);
1132 if (status < 0 &&
1133 status != -EPIPE &&
1134 status != -ESHUTDOWN) {
1135 if (netif_msg_rx_err (dev))
1136 fail_halt:
1137 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1138 status);
1139 } else {
1140 clear_bit (EVENT_RX_HALT, &dev->flags);
1141 tasklet_schedule (&dev->bh);
1142 }
1143 }
1144
1145 /* tasklet could resubmit itself forever if memory is tight */
1146 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1147 struct urb *urb = NULL;
1148 int resched = 1;
1149
1150 if (netif_running (dev->net))
1151 urb = usb_alloc_urb (0, GFP_KERNEL);
1152 else
1153 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1154 if (urb != NULL) {
1155 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1156 status = usb_autopm_get_interface(dev->intf);
1157 if (status < 0) {
1158 usb_free_urb(urb);
1159 goto fail_lowmem;
1160 }
1161 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1162 resched = 0;
1163 usb_autopm_put_interface(dev->intf);
1164 fail_lowmem:
1165 if (resched)
1166 tasklet_schedule (&dev->bh);
1167 }
1168 }
1169
1170 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1171 struct driver_info *info = dev->driver_info;
1172 int retval = 0;
1173
1174 clear_bit (EVENT_LINK_RESET, &dev->flags);
1175 status = usb_autopm_get_interface(dev->intf);
1176 if (status < 0)
1177 goto skip_reset;
1178 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1179 usb_autopm_put_interface(dev->intf);
1180 skip_reset:
1181 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1182 retval,
1183 dev->udev->bus->bus_name,
1184 dev->udev->devpath,
1185 info->description);
1186 } else {
1187 usb_autopm_put_interface(dev->intf);
1188 }
1189
1190 /* handle link change from link resetting */
1191 __handle_link_change(dev);
1192 }
1193
1194 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1195 __handle_link_change(dev);
1196
1197 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1198 __handle_set_rx_mode(dev);
1199
1200
1201 if (dev->flags)
1202 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1203 }
1204
1205 /*-------------------------------------------------------------------------*/
1206
1207 static void tx_complete (struct urb *urb)
1208 {
1209 struct sk_buff *skb = (struct sk_buff *) urb->context;
1210 struct skb_data *entry = (struct skb_data *) skb->cb;
1211 struct usbnet *dev = entry->dev;
1212
1213 if (urb->status == 0) {
1214 dev->net->stats.tx_packets += entry->packets;
1215 dev->net->stats.tx_bytes += entry->length;
1216 } else {
1217 dev->net->stats.tx_errors++;
1218
1219 switch (urb->status) {
1220 case -EPIPE:
1221 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1222 break;
1223
1224 /* software-driven interface shutdown */
1225 case -ECONNRESET: // async unlink
1226 case -ESHUTDOWN: // hardware gone
1227 break;
1228
1229 /* like rx, tx gets controller i/o faults during hub_wq
1230 * delays and so it uses the same throttling mechanism.
1231 */
1232 case -EPROTO:
1233 case -ETIME:
1234 case -EILSEQ:
1235 usb_mark_last_busy(dev->udev);
1236 if (!timer_pending (&dev->delay)) {
1237 mod_timer (&dev->delay,
1238 jiffies + THROTTLE_JIFFIES);
1239 netif_dbg(dev, link, dev->net,
1240 "tx throttle %d\n", urb->status);
1241 }
1242 netif_stop_queue (dev->net);
1243 break;
1244 default:
1245 netif_dbg(dev, tx_err, dev->net,
1246 "tx err %d\n", entry->urb->status);
1247 break;
1248 }
1249 }
1250
1251 usb_autopm_put_interface_async(dev->intf);
1252 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1253 }
1254
1255 /*-------------------------------------------------------------------------*/
1256
1257 void usbnet_tx_timeout (struct net_device *net)
1258 {
1259 struct usbnet *dev = netdev_priv(net);
1260
1261 unlink_urbs (dev, &dev->txq);
1262 tasklet_schedule (&dev->bh);
1263 /* this needs to be handled individually because the generic layer
1264 * doesn't know what is sufficient and could not restore private
1265 * information if a remedy of an unconditional reset were used.
1266 */
1267 if (dev->driver_info->recover)
1268 (dev->driver_info->recover)(dev);
1269 }
1270 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1271
1272 /*-------------------------------------------------------------------------*/
1273
1274 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1275 {
1276 unsigned num_sgs, total_len = 0;
1277 int i, s = 0;
1278
1279 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1280 if (num_sgs == 1)
1281 return 0;
1282
1283 /* reserve one for zero packet */
1284 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1285 GFP_ATOMIC);
1286 if (!urb->sg)
1287 return -ENOMEM;
1288
1289 urb->num_sgs = num_sgs;
1290 sg_init_table(urb->sg, urb->num_sgs + 1);
1291
1292 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1293 total_len += skb_headlen(skb);
1294
1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1296 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1297
1298 total_len += skb_frag_size(f);
1299 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1300 f->page_offset);
1301 }
1302 urb->transfer_buffer_length = total_len;
1303
1304 return 1;
1305 }
1306
1307 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1308 struct net_device *net)
1309 {
1310 struct usbnet *dev = netdev_priv(net);
1311 unsigned int length;
1312 struct urb *urb = NULL;
1313 struct skb_data *entry;
1314 struct driver_info *info = dev->driver_info;
1315 unsigned long flags;
1316 int retval;
1317
1318 if (skb)
1319 skb_tx_timestamp(skb);
1320
1321 // some devices want funky USB-level framing, for
1322 // win32 driver (usually) and/or hardware quirks
1323 if (info->tx_fixup) {
1324 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1325 if (!skb) {
1326 /* packet collected; minidriver waiting for more */
1327 if (info->flags & FLAG_MULTI_PACKET)
1328 goto not_drop;
1329 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1330 goto drop;
1331 }
1332 }
1333
1334 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1335 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1336 goto drop;
1337 }
1338
1339 entry = (struct skb_data *) skb->cb;
1340 entry->urb = urb;
1341 entry->dev = dev;
1342
1343 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1344 skb->data, skb->len, tx_complete, skb);
1345 if (dev->can_dma_sg) {
1346 if (build_dma_sg(skb, urb) < 0)
1347 goto drop;
1348 }
1349 length = urb->transfer_buffer_length;
1350
1351 /* don't assume the hardware handles USB_ZERO_PACKET
1352 * NOTE: strictly conforming cdc-ether devices should expect
1353 * the ZLP here, but ignore the one-byte packet.
1354 * NOTE2: CDC NCM specification is different from CDC ECM when
1355 * handling ZLP/short packets, so cdc_ncm driver will make short
1356 * packet itself if needed.
1357 */
1358 if (length % dev->maxpacket == 0) {
1359 if (!(info->flags & FLAG_SEND_ZLP)) {
1360 if (!(info->flags & FLAG_MULTI_PACKET)) {
1361 length++;
1362 if (skb_tailroom(skb) && !urb->num_sgs) {
1363 skb->data[skb->len] = 0;
1364 __skb_put(skb, 1);
1365 } else if (urb->num_sgs)
1366 sg_set_buf(&urb->sg[urb->num_sgs++],
1367 dev->padding_pkt, 1);
1368 }
1369 } else
1370 urb->transfer_flags |= URB_ZERO_PACKET;
1371 }
1372 urb->transfer_buffer_length = length;
1373
1374 if (info->flags & FLAG_MULTI_PACKET) {
1375 /* Driver has set number of packets and a length delta.
1376 * Calculate the complete length and ensure that it's
1377 * positive.
1378 */
1379 entry->length += length;
1380 if (WARN_ON_ONCE(entry->length <= 0))
1381 entry->length = length;
1382 } else {
1383 usbnet_set_skb_tx_stats(skb, 1, length);
1384 }
1385
1386 spin_lock_irqsave(&dev->txq.lock, flags);
1387 retval = usb_autopm_get_interface_async(dev->intf);
1388 if (retval < 0) {
1389 spin_unlock_irqrestore(&dev->txq.lock, flags);
1390 goto drop;
1391 }
1392
1393 #ifdef CONFIG_PM
1394 /* if this triggers the device is still a sleep */
1395 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1396 /* transmission will be done in resume */
1397 usb_anchor_urb(urb, &dev->deferred);
1398 /* no use to process more packets */
1399 netif_stop_queue(net);
1400 usb_put_urb(urb);
1401 spin_unlock_irqrestore(&dev->txq.lock, flags);
1402 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1403 goto deferred;
1404 }
1405 #endif
1406
1407 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1408 case -EPIPE:
1409 netif_stop_queue (net);
1410 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1411 usb_autopm_put_interface_async(dev->intf);
1412 break;
1413 default:
1414 usb_autopm_put_interface_async(dev->intf);
1415 netif_dbg(dev, tx_err, dev->net,
1416 "tx: submit urb err %d\n", retval);
1417 break;
1418 case 0:
1419 netif_trans_update(net);
1420 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1421 if (dev->txq.qlen >= TX_QLEN (dev))
1422 netif_stop_queue (net);
1423 }
1424 spin_unlock_irqrestore (&dev->txq.lock, flags);
1425
1426 if (retval) {
1427 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1428 drop:
1429 dev->net->stats.tx_dropped++;
1430 not_drop:
1431 if (skb)
1432 dev_kfree_skb_any (skb);
1433 if (urb) {
1434 kfree(urb->sg);
1435 usb_free_urb(urb);
1436 }
1437 } else
1438 netif_dbg(dev, tx_queued, dev->net,
1439 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1440 #ifdef CONFIG_PM
1441 deferred:
1442 #endif
1443 return NETDEV_TX_OK;
1444 }
1445 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1446
1447 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1448 {
1449 struct urb *urb;
1450 int i;
1451 int ret = 0;
1452
1453 /* don't refill the queue all at once */
1454 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1455 urb = usb_alloc_urb(0, flags);
1456 if (urb != NULL) {
1457 ret = rx_submit(dev, urb, flags);
1458 if (ret)
1459 goto err;
1460 } else {
1461 ret = -ENOMEM;
1462 goto err;
1463 }
1464 }
1465 err:
1466 return ret;
1467 }
1468
1469 /*-------------------------------------------------------------------------*/
1470
1471 // tasklet (work deferred from completions, in_irq) or timer
1472
1473 static void usbnet_bh (unsigned long param)
1474 {
1475 struct usbnet *dev = (struct usbnet *) param;
1476 struct sk_buff *skb;
1477 struct skb_data *entry;
1478
1479 while ((skb = skb_dequeue (&dev->done))) {
1480 entry = (struct skb_data *) skb->cb;
1481 switch (entry->state) {
1482 case rx_done:
1483 entry->state = rx_cleanup;
1484 rx_process (dev, skb);
1485 continue;
1486 case tx_done:
1487 kfree(entry->urb->sg);
1488 case rx_cleanup:
1489 usb_free_urb (entry->urb);
1490 dev_kfree_skb (skb);
1491 continue;
1492 default:
1493 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1494 }
1495 }
1496
1497 /* restart RX again after disabling due to high error rate */
1498 clear_bit(EVENT_RX_KILL, &dev->flags);
1499
1500 /* waiting for all pending urbs to complete?
1501 * only then can we forgo submitting anew
1502 */
1503 if (waitqueue_active(&dev->wait)) {
1504 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1505 wake_up_all(&dev->wait);
1506
1507 // or are we maybe short a few urbs?
1508 } else if (netif_running (dev->net) &&
1509 netif_device_present (dev->net) &&
1510 netif_carrier_ok(dev->net) &&
1511 !timer_pending(&dev->delay) &&
1512 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1513 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1514 int temp = dev->rxq.qlen;
1515
1516 if (temp < RX_QLEN(dev)) {
1517 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1518 return;
1519 if (temp != dev->rxq.qlen)
1520 netif_dbg(dev, link, dev->net,
1521 "rxqlen %d --> %d\n",
1522 temp, dev->rxq.qlen);
1523 if (dev->rxq.qlen < RX_QLEN(dev))
1524 tasklet_schedule (&dev->bh);
1525 }
1526 if (dev->txq.qlen < TX_QLEN (dev))
1527 netif_wake_queue (dev->net);
1528 }
1529 }
1530
1531
1532 /*-------------------------------------------------------------------------
1533 *
1534 * USB Device Driver support
1535 *
1536 *-------------------------------------------------------------------------*/
1537
1538 // precondition: never called in_interrupt
1539
1540 void usbnet_disconnect (struct usb_interface *intf)
1541 {
1542 struct usbnet *dev;
1543 struct usb_device *xdev;
1544 struct net_device *net;
1545
1546 dev = usb_get_intfdata(intf);
1547 usb_set_intfdata(intf, NULL);
1548 if (!dev)
1549 return;
1550
1551 xdev = interface_to_usbdev (intf);
1552
1553 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1554 intf->dev.driver->name,
1555 xdev->bus->bus_name, xdev->devpath,
1556 dev->driver_info->description);
1557
1558 net = dev->net;
1559 unregister_netdev (net);
1560
1561 cancel_work_sync(&dev->kevent);
1562
1563 usb_scuttle_anchored_urbs(&dev->deferred);
1564
1565 if (dev->driver_info->unbind)
1566 dev->driver_info->unbind (dev, intf);
1567
1568 usb_kill_urb(dev->interrupt);
1569 usb_free_urb(dev->interrupt);
1570 kfree(dev->padding_pkt);
1571
1572 free_netdev(net);
1573 }
1574 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1575
1576 static const struct net_device_ops usbnet_netdev_ops = {
1577 .ndo_open = usbnet_open,
1578 .ndo_stop = usbnet_stop,
1579 .ndo_start_xmit = usbnet_start_xmit,
1580 .ndo_tx_timeout = usbnet_tx_timeout,
1581 .ndo_set_rx_mode = usbnet_set_rx_mode,
1582 .ndo_change_mtu = usbnet_change_mtu,
1583 .ndo_set_mac_address = eth_mac_addr,
1584 .ndo_validate_addr = eth_validate_addr,
1585 };
1586
1587 /*-------------------------------------------------------------------------*/
1588
1589 // precondition: never called in_interrupt
1590
1591 static struct device_type wlan_type = {
1592 .name = "wlan",
1593 };
1594
1595 static struct device_type wwan_type = {
1596 .name = "wwan",
1597 };
1598
1599 int
1600 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1601 {
1602 struct usbnet *dev;
1603 struct net_device *net;
1604 struct usb_host_interface *interface;
1605 struct driver_info *info;
1606 struct usb_device *xdev;
1607 int status;
1608 const char *name;
1609 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1610
1611 /* usbnet already took usb runtime pm, so have to enable the feature
1612 * for usb interface, otherwise usb_autopm_get_interface may return
1613 * failure if RUNTIME_PM is enabled.
1614 */
1615 if (!driver->supports_autosuspend) {
1616 driver->supports_autosuspend = 1;
1617 pm_runtime_enable(&udev->dev);
1618 }
1619
1620 name = udev->dev.driver->name;
1621 info = (struct driver_info *) prod->driver_info;
1622 if (!info) {
1623 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1624 return -ENODEV;
1625 }
1626 xdev = interface_to_usbdev (udev);
1627 interface = udev->cur_altsetting;
1628
1629 status = -ENOMEM;
1630
1631 // set up our own records
1632 net = alloc_etherdev(sizeof(*dev));
1633 if (!net)
1634 goto out;
1635
1636 /* netdev_printk() needs this so do it as early as possible */
1637 SET_NETDEV_DEV(net, &udev->dev);
1638
1639 dev = netdev_priv(net);
1640 dev->udev = xdev;
1641 dev->intf = udev;
1642 dev->driver_info = info;
1643 dev->driver_name = name;
1644 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1645 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1646 init_waitqueue_head(&dev->wait);
1647 skb_queue_head_init (&dev->rxq);
1648 skb_queue_head_init (&dev->txq);
1649 skb_queue_head_init (&dev->done);
1650 skb_queue_head_init(&dev->rxq_pause);
1651 dev->bh.func = usbnet_bh;
1652 dev->bh.data = (unsigned long) dev;
1653 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1654 init_usb_anchor(&dev->deferred);
1655 dev->delay.function = usbnet_bh;
1656 dev->delay.data = (unsigned long) dev;
1657 init_timer (&dev->delay);
1658 mutex_init (&dev->phy_mutex);
1659 mutex_init(&dev->interrupt_mutex);
1660 dev->interrupt_count = 0;
1661
1662 dev->net = net;
1663 strcpy (net->name, "usb%d");
1664 memcpy (net->dev_addr, node_id, sizeof node_id);
1665
1666 /* rx and tx sides can use different message sizes;
1667 * bind() should set rx_urb_size in that case.
1668 */
1669 dev->hard_mtu = net->mtu + net->hard_header_len;
1670 net->min_mtu = 0;
1671 net->max_mtu = ETH_MAX_MTU;
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");
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