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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, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21/*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33// #define DEBUG // error path messages, extra info
34// #define VERBOSE // more; success messages
35
36#include <linux/module.h>
37#include <linux/init.h>
38#include <linux/netdevice.h>
39#include <linux/etherdevice.h>
40#include <linux/ctype.h>
41#include <linux/ethtool.h>
42#include <linux/workqueue.h>
43#include <linux/mii.h>
44#include <linux/usb.h>
45#include <linux/usb/usbnet.h>
46#include <linux/slab.h>
47#include <linux/kernel.h>
48#include <linux/pm_runtime.h>
49
50#define DRIVER_VERSION "22-Aug-2005"
51
52
53/*-------------------------------------------------------------------------*/
54
55/*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
65 */
66#define RX_MAX_QUEUE_MEMORY (60 * 1518)
67#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
71
72// reawaken network queue this soon after stopping; else watchdog barks
73#define TX_TIMEOUT_JIFFIES (5*HZ)
74
75// throttle rx/tx briefly after some faults, so khubd might disconnect()
76// us (it polls at HZ/4 usually) before we report too many false errors.
77#define THROTTLE_JIFFIES (HZ/8)
78
79// between wakeups
80#define UNLINK_TIMEOUT_MS 3
81
82/*-------------------------------------------------------------------------*/
83
84// randomly generated ethernet address
85static u8 node_id [ETH_ALEN];
86
87static const char driver_name [] = "usbnet";
88
89/* use ethtool to change the level for any given device */
90static int msg_level = -1;
91module_param (msg_level, int, 0);
92MODULE_PARM_DESC (msg_level, "Override default message level");
93
94/*-------------------------------------------------------------------------*/
95
96/* handles CDC Ethernet and many other network "bulk data" interfaces */
97int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
98{
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsettings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
130 if (usb_endpoint_dir_in(&e->desc)) {
131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
153
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160}
161EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
162
163int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164{
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
179 return 0;
180}
181EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
183static void intr_complete (struct urb *urb);
184
185static int init_status (struct usbnet *dev, struct usb_interface *intf)
186{
187 char *buf = NULL;
188 unsigned pipe = 0;
189 unsigned maxp;
190 unsigned period;
191
192 if (!dev->driver_info->status)
193 return 0;
194
195 pipe = usb_rcvintpipe (dev->udev,
196 dev->status->desc.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK);
198 maxp = usb_maxpacket (dev->udev, pipe, 0);
199
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period = max ((int) dev->status->desc.bInterval,
202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
203
204 buf = kmalloc (maxp, GFP_KERNEL);
205 if (buf) {
206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
207 if (!dev->interrupt) {
208 kfree (buf);
209 return -ENOMEM;
210 } else {
211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
212 buf, maxp, intr_complete, dev, period);
213 dev_dbg(&intf->dev,
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe), maxp, period);
216 }
217 }
218 return 0;
219}
220
221/* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
224 */
225void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
226{
227 int status;
228
229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
230 skb_queue_tail(&dev->rxq_pause, skb);
231 return;
232 }
233
234 skb->protocol = eth_type_trans (skb, dev->net);
235 dev->net->stats.rx_packets++;
236 dev->net->stats.rx_bytes += skb->len;
237
238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
239 skb->len + sizeof (struct ethhdr), skb->protocol);
240 memset (skb->cb, 0, sizeof (struct skb_data));
241 status = netif_rx (skb);
242 if (status != NET_RX_SUCCESS)
243 netif_dbg(dev, rx_err, dev->net,
244 "netif_rx status %d\n", status);
245}
246EXPORT_SYMBOL_GPL(usbnet_skb_return);
247
248
249/*-------------------------------------------------------------------------
250 *
251 * Network Device Driver (peer link to "Host Device", from USB host)
252 *
253 *-------------------------------------------------------------------------*/
254
255int usbnet_change_mtu (struct net_device *net, int new_mtu)
256{
257 struct usbnet *dev = netdev_priv(net);
258 int ll_mtu = new_mtu + net->hard_header_len;
259 int old_hard_mtu = dev->hard_mtu;
260 int old_rx_urb_size = dev->rx_urb_size;
261
262 if (new_mtu <= 0)
263 return -EINVAL;
264 // no second zero-length packet read wanted after mtu-sized packets
265 if ((ll_mtu % dev->maxpacket) == 0)
266 return -EDOM;
267 net->mtu = new_mtu;
268
269 dev->hard_mtu = net->mtu + net->hard_header_len;
270 if (dev->rx_urb_size == old_hard_mtu) {
271 dev->rx_urb_size = dev->hard_mtu;
272 if (dev->rx_urb_size > old_rx_urb_size)
273 usbnet_unlink_rx_urbs(dev);
274 }
275
276 return 0;
277}
278EXPORT_SYMBOL_GPL(usbnet_change_mtu);
279
280/*-------------------------------------------------------------------------*/
281
282/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
284 */
285
286static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
287{
288 unsigned long flags;
289
290 spin_lock_irqsave(&list->lock, flags);
291 __skb_unlink(skb, list);
292 spin_unlock(&list->lock);
293 spin_lock(&dev->done.lock);
294 __skb_queue_tail(&dev->done, skb);
295 if (dev->done.qlen == 1)
296 tasklet_schedule(&dev->bh);
297 spin_unlock_irqrestore(&dev->done.lock, flags);
298}
299
300/* some work can't be done in tasklets, so we use keventd
301 *
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
304 */
305void usbnet_defer_kevent (struct usbnet *dev, int work)
306{
307 set_bit (work, &dev->flags);
308 if (!schedule_work (&dev->kevent))
309 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
310 else
311 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
312}
313EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
314
315/*-------------------------------------------------------------------------*/
316
317static void rx_complete (struct urb *urb);
318
319static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
320{
321 struct sk_buff *skb;
322 struct skb_data *entry;
323 int retval = 0;
324 unsigned long lockflags;
325 size_t size = dev->rx_urb_size;
326
327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
330 usb_free_urb (urb);
331 return -ENOMEM;
332 }
333 skb_reserve (skb, NET_IP_ALIGN);
334
335 entry = (struct skb_data *) skb->cb;
336 entry->urb = urb;
337 entry->dev = dev;
338 entry->state = rx_start;
339 entry->length = 0;
340
341 usb_fill_bulk_urb (urb, dev->udev, dev->in,
342 skb->data, size, rx_complete, skb);
343
344 spin_lock_irqsave (&dev->rxq.lock, lockflags);
345
346 if (netif_running (dev->net) &&
347 netif_device_present (dev->net) &&
348 !test_bit (EVENT_RX_HALT, &dev->flags) &&
349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
351 case -EPIPE:
352 usbnet_defer_kevent (dev, EVENT_RX_HALT);
353 break;
354 case -ENOMEM:
355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
356 break;
357 case -ENODEV:
358 netif_dbg(dev, ifdown, dev->net, "device gone\n");
359 netif_device_detach (dev->net);
360 break;
361 case -EHOSTUNREACH:
362 retval = -ENOLINK;
363 break;
364 default:
365 netif_dbg(dev, rx_err, dev->net,
366 "rx submit, %d\n", retval);
367 tasklet_schedule (&dev->bh);
368 break;
369 case 0:
370 __skb_queue_tail (&dev->rxq, skb);
371 }
372 } else {
373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
374 retval = -ENOLINK;
375 }
376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
377 if (retval) {
378 dev_kfree_skb_any (skb);
379 usb_free_urb (urb);
380 }
381 return retval;
382}
383
384
385/*-------------------------------------------------------------------------*/
386
387static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
388{
389 if (dev->driver_info->rx_fixup &&
390 !dev->driver_info->rx_fixup (dev, skb)) {
391 /* With RX_ASSEMBLE, rx_fixup() must update counters */
392 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
393 dev->net->stats.rx_errors++;
394 goto done;
395 }
396 // else network stack removes extra byte if we forced a short packet
397
398 if (skb->len) {
399 /* all data was already cloned from skb inside the driver */
400 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
401 dev_kfree_skb_any(skb);
402 else
403 usbnet_skb_return(dev, skb);
404 return;
405 }
406
407 netif_dbg(dev, rx_err, dev->net, "drop\n");
408 dev->net->stats.rx_errors++;
409done:
410 skb_queue_tail(&dev->done, skb);
411}
412
413/*-------------------------------------------------------------------------*/
414
415static void rx_complete (struct urb *urb)
416{
417 struct sk_buff *skb = (struct sk_buff *) urb->context;
418 struct skb_data *entry = (struct skb_data *) skb->cb;
419 struct usbnet *dev = entry->dev;
420 int urb_status = urb->status;
421
422 skb_put (skb, urb->actual_length);
423 entry->state = rx_done;
424 entry->urb = NULL;
425
426 switch (urb_status) {
427 /* success */
428 case 0:
429 if (skb->len < dev->net->hard_header_len) {
430 entry->state = rx_cleanup;
431 dev->net->stats.rx_errors++;
432 dev->net->stats.rx_length_errors++;
433 netif_dbg(dev, rx_err, dev->net,
434 "rx length %d\n", skb->len);
435 }
436 break;
437
438 /* stalls need manual reset. this is rare ... except that
439 * when going through USB 2.0 TTs, unplug appears this way.
440 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
441 * storm, recovering as needed.
442 */
443 case -EPIPE:
444 dev->net->stats.rx_errors++;
445 usbnet_defer_kevent (dev, EVENT_RX_HALT);
446 // FALLTHROUGH
447
448 /* software-driven interface shutdown */
449 case -ECONNRESET: /* async unlink */
450 case -ESHUTDOWN: /* hardware gone */
451 netif_dbg(dev, ifdown, dev->net,
452 "rx shutdown, code %d\n", urb_status);
453 goto block;
454
455 /* we get controller i/o faults during khubd disconnect() delays.
456 * throttle down resubmits, to avoid log floods; just temporarily,
457 * so we still recover when the fault isn't a khubd delay.
458 */
459 case -EPROTO:
460 case -ETIME:
461 case -EILSEQ:
462 dev->net->stats.rx_errors++;
463 if (!timer_pending (&dev->delay)) {
464 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
465 netif_dbg(dev, link, dev->net,
466 "rx throttle %d\n", urb_status);
467 }
468block:
469 entry->state = rx_cleanup;
470 entry->urb = urb;
471 urb = NULL;
472 break;
473
474 /* data overrun ... flush fifo? */
475 case -EOVERFLOW:
476 dev->net->stats.rx_over_errors++;
477 // FALLTHROUGH
478
479 default:
480 entry->state = rx_cleanup;
481 dev->net->stats.rx_errors++;
482 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
483 break;
484 }
485
486 defer_bh(dev, skb, &dev->rxq);
487
488 if (urb) {
489 if (netif_running (dev->net) &&
490 !test_bit (EVENT_RX_HALT, &dev->flags)) {
491 rx_submit (dev, urb, GFP_ATOMIC);
492 return;
493 }
494 usb_free_urb (urb);
495 }
496 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
497}
498
499static void intr_complete (struct urb *urb)
500{
501 struct usbnet *dev = urb->context;
502 int status = urb->status;
503
504 switch (status) {
505 /* success */
506 case 0:
507 dev->driver_info->status(dev, urb);
508 break;
509
510 /* software-driven interface shutdown */
511 case -ENOENT: /* urb killed */
512 case -ESHUTDOWN: /* hardware gone */
513 netif_dbg(dev, ifdown, dev->net,
514 "intr shutdown, code %d\n", status);
515 return;
516
517 /* NOTE: not throttling like RX/TX, since this endpoint
518 * already polls infrequently
519 */
520 default:
521 netdev_dbg(dev->net, "intr status %d\n", status);
522 break;
523 }
524
525 if (!netif_running (dev->net))
526 return;
527
528 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
529 status = usb_submit_urb (urb, GFP_ATOMIC);
530 if (status != 0)
531 netif_err(dev, timer, dev->net,
532 "intr resubmit --> %d\n", status);
533}
534
535/*-------------------------------------------------------------------------*/
536void usbnet_pause_rx(struct usbnet *dev)
537{
538 set_bit(EVENT_RX_PAUSED, &dev->flags);
539
540 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
541}
542EXPORT_SYMBOL_GPL(usbnet_pause_rx);
543
544void usbnet_resume_rx(struct usbnet *dev)
545{
546 struct sk_buff *skb;
547 int num = 0;
548
549 clear_bit(EVENT_RX_PAUSED, &dev->flags);
550
551 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
552 usbnet_skb_return(dev, skb);
553 num++;
554 }
555
556 tasklet_schedule(&dev->bh);
557
558 netif_dbg(dev, rx_status, dev->net,
559 "paused rx queue disabled, %d skbs requeued\n", num);
560}
561EXPORT_SYMBOL_GPL(usbnet_resume_rx);
562
563void usbnet_purge_paused_rxq(struct usbnet *dev)
564{
565 skb_queue_purge(&dev->rxq_pause);
566}
567EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
568
569/*-------------------------------------------------------------------------*/
570
571// unlink pending rx/tx; completion handlers do all other cleanup
572
573static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
574{
575 unsigned long flags;
576 struct sk_buff *skb, *skbnext;
577 int count = 0;
578
579 spin_lock_irqsave (&q->lock, flags);
580 skb_queue_walk_safe(q, skb, skbnext) {
581 struct skb_data *entry;
582 struct urb *urb;
583 int retval;
584
585 entry = (struct skb_data *) skb->cb;
586 urb = entry->urb;
587
588 // during some PM-driven resume scenarios,
589 // these (async) unlinks complete immediately
590 retval = usb_unlink_urb (urb);
591 if (retval != -EINPROGRESS && retval != 0)
592 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
593 else
594 count++;
595 }
596 spin_unlock_irqrestore (&q->lock, flags);
597 return count;
598}
599
600// Flush all pending rx urbs
601// minidrivers may need to do this when the MTU changes
602
603void usbnet_unlink_rx_urbs(struct usbnet *dev)
604{
605 if (netif_running(dev->net)) {
606 (void) unlink_urbs (dev, &dev->rxq);
607 tasklet_schedule(&dev->bh);
608 }
609}
610EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
611
612/*-------------------------------------------------------------------------*/
613
614// precondition: never called in_interrupt
615static void usbnet_terminate_urbs(struct usbnet *dev)
616{
617 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
618 DECLARE_WAITQUEUE(wait, current);
619 int temp;
620
621 /* ensure there are no more active urbs */
622 add_wait_queue(&unlink_wakeup, &wait);
623 set_current_state(TASK_UNINTERRUPTIBLE);
624 dev->wait = &unlink_wakeup;
625 temp = unlink_urbs(dev, &dev->txq) +
626 unlink_urbs(dev, &dev->rxq);
627
628 /* maybe wait for deletions to finish. */
629 while (!skb_queue_empty(&dev->rxq)
630 && !skb_queue_empty(&dev->txq)
631 && !skb_queue_empty(&dev->done)) {
632 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
633 set_current_state(TASK_UNINTERRUPTIBLE);
634 netif_dbg(dev, ifdown, dev->net,
635 "waited for %d urb completions\n", temp);
636 }
637 set_current_state(TASK_RUNNING);
638 dev->wait = NULL;
639 remove_wait_queue(&unlink_wakeup, &wait);
640}
641
642int usbnet_stop (struct net_device *net)
643{
644 struct usbnet *dev = netdev_priv(net);
645 struct driver_info *info = dev->driver_info;
646 int retval;
647
648 clear_bit(EVENT_DEV_OPEN, &dev->flags);
649 netif_stop_queue (net);
650
651 netif_info(dev, ifdown, dev->net,
652 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
653 net->stats.rx_packets, net->stats.tx_packets,
654 net->stats.rx_errors, net->stats.tx_errors);
655
656 /* allow minidriver to stop correctly (wireless devices to turn off
657 * radio etc) */
658 if (info->stop) {
659 retval = info->stop(dev);
660 if (retval < 0)
661 netif_info(dev, ifdown, dev->net,
662 "stop fail (%d) usbnet usb-%s-%s, %s\n",
663 retval,
664 dev->udev->bus->bus_name, dev->udev->devpath,
665 info->description);
666 }
667
668 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
669 usbnet_terminate_urbs(dev);
670
671 usb_kill_urb(dev->interrupt);
672
673 usbnet_purge_paused_rxq(dev);
674
675 /* deferred work (task, timer, softirq) must also stop.
676 * can't flush_scheduled_work() until we drop rtnl (later),
677 * else workers could deadlock; so make workers a NOP.
678 */
679 dev->flags = 0;
680 del_timer_sync (&dev->delay);
681 tasklet_kill (&dev->bh);
682 if (info->manage_power)
683 info->manage_power(dev, 0);
684 else
685 usb_autopm_put_interface(dev->intf);
686
687 return 0;
688}
689EXPORT_SYMBOL_GPL(usbnet_stop);
690
691/*-------------------------------------------------------------------------*/
692
693// posts reads, and enables write queuing
694
695// precondition: never called in_interrupt
696
697int usbnet_open (struct net_device *net)
698{
699 struct usbnet *dev = netdev_priv(net);
700 int retval;
701 struct driver_info *info = dev->driver_info;
702
703 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
704 netif_info(dev, ifup, dev->net,
705 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
706 retval,
707 dev->udev->bus->bus_name,
708 dev->udev->devpath,
709 info->description);
710 goto done_nopm;
711 }
712
713 // put into "known safe" state
714 if (info->reset && (retval = info->reset (dev)) < 0) {
715 netif_info(dev, ifup, dev->net,
716 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
717 retval,
718 dev->udev->bus->bus_name,
719 dev->udev->devpath,
720 info->description);
721 goto done;
722 }
723
724 // insist peer be connected
725 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
726 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
727 goto done;
728 }
729
730 /* start any status interrupt transfer */
731 if (dev->interrupt) {
732 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
733 if (retval < 0) {
734 netif_err(dev, ifup, dev->net,
735 "intr submit %d\n", retval);
736 goto done;
737 }
738 }
739
740 set_bit(EVENT_DEV_OPEN, &dev->flags);
741 netif_start_queue (net);
742 netif_info(dev, ifup, dev->net,
743 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
744 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
745 dev->net->mtu,
746 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
747 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
748 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
749 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
750 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
751 "simple");
752
753 // delay posting reads until we're fully open
754 tasklet_schedule (&dev->bh);
755 if (info->manage_power) {
756 retval = info->manage_power(dev, 1);
757 if (retval < 0)
758 goto done;
759 usb_autopm_put_interface(dev->intf);
760 }
761 return retval;
762
763done:
764 usb_autopm_put_interface(dev->intf);
765done_nopm:
766 return retval;
767}
768EXPORT_SYMBOL_GPL(usbnet_open);
769
770/*-------------------------------------------------------------------------*/
771
772/* ethtool methods; minidrivers may need to add some more, but
773 * they'll probably want to use this base set.
774 */
775
776int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
777{
778 struct usbnet *dev = netdev_priv(net);
779
780 if (!dev->mii.mdio_read)
781 return -EOPNOTSUPP;
782
783 return mii_ethtool_gset(&dev->mii, cmd);
784}
785EXPORT_SYMBOL_GPL(usbnet_get_settings);
786
787int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
788{
789 struct usbnet *dev = netdev_priv(net);
790 int retval;
791
792 if (!dev->mii.mdio_write)
793 return -EOPNOTSUPP;
794
795 retval = mii_ethtool_sset(&dev->mii, cmd);
796
797 /* link speed/duplex might have changed */
798 if (dev->driver_info->link_reset)
799 dev->driver_info->link_reset(dev);
800
801 return retval;
802
803}
804EXPORT_SYMBOL_GPL(usbnet_set_settings);
805
806u32 usbnet_get_link (struct net_device *net)
807{
808 struct usbnet *dev = netdev_priv(net);
809
810 /* If a check_connect is defined, return its result */
811 if (dev->driver_info->check_connect)
812 return dev->driver_info->check_connect (dev) == 0;
813
814 /* if the device has mii operations, use those */
815 if (dev->mii.mdio_read)
816 return mii_link_ok(&dev->mii);
817
818 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
819 return ethtool_op_get_link(net);
820}
821EXPORT_SYMBOL_GPL(usbnet_get_link);
822
823int usbnet_nway_reset(struct net_device *net)
824{
825 struct usbnet *dev = netdev_priv(net);
826
827 if (!dev->mii.mdio_write)
828 return -EOPNOTSUPP;
829
830 return mii_nway_restart(&dev->mii);
831}
832EXPORT_SYMBOL_GPL(usbnet_nway_reset);
833
834void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
835{
836 struct usbnet *dev = netdev_priv(net);
837
838 strncpy (info->driver, dev->driver_name, sizeof info->driver);
839 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
840 strncpy (info->fw_version, dev->driver_info->description,
841 sizeof info->fw_version);
842 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
843}
844EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
845
846u32 usbnet_get_msglevel (struct net_device *net)
847{
848 struct usbnet *dev = netdev_priv(net);
849
850 return dev->msg_enable;
851}
852EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
853
854void usbnet_set_msglevel (struct net_device *net, u32 level)
855{
856 struct usbnet *dev = netdev_priv(net);
857
858 dev->msg_enable = level;
859}
860EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
861
862/* drivers may override default ethtool_ops in their bind() routine */
863static const struct ethtool_ops usbnet_ethtool_ops = {
864 .get_settings = usbnet_get_settings,
865 .set_settings = usbnet_set_settings,
866 .get_link = usbnet_get_link,
867 .nway_reset = usbnet_nway_reset,
868 .get_drvinfo = usbnet_get_drvinfo,
869 .get_msglevel = usbnet_get_msglevel,
870 .set_msglevel = usbnet_set_msglevel,
871};
872
873/*-------------------------------------------------------------------------*/
874
875/* work that cannot be done in interrupt context uses keventd.
876 *
877 * NOTE: with 2.5 we could do more of this using completion callbacks,
878 * especially now that control transfers can be queued.
879 */
880static void
881kevent (struct work_struct *work)
882{
883 struct usbnet *dev =
884 container_of(work, struct usbnet, kevent);
885 int status;
886
887 /* usb_clear_halt() needs a thread context */
888 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
889 unlink_urbs (dev, &dev->txq);
890 status = usb_autopm_get_interface(dev->intf);
891 if (status < 0)
892 goto fail_pipe;
893 status = usb_clear_halt (dev->udev, dev->out);
894 usb_autopm_put_interface(dev->intf);
895 if (status < 0 &&
896 status != -EPIPE &&
897 status != -ESHUTDOWN) {
898 if (netif_msg_tx_err (dev))
899fail_pipe:
900 netdev_err(dev->net, "can't clear tx halt, status %d\n",
901 status);
902 } else {
903 clear_bit (EVENT_TX_HALT, &dev->flags);
904 if (status != -ESHUTDOWN)
905 netif_wake_queue (dev->net);
906 }
907 }
908 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
909 unlink_urbs (dev, &dev->rxq);
910 status = usb_autopm_get_interface(dev->intf);
911 if (status < 0)
912 goto fail_halt;
913 status = usb_clear_halt (dev->udev, dev->in);
914 usb_autopm_put_interface(dev->intf);
915 if (status < 0 &&
916 status != -EPIPE &&
917 status != -ESHUTDOWN) {
918 if (netif_msg_rx_err (dev))
919fail_halt:
920 netdev_err(dev->net, "can't clear rx halt, status %d\n",
921 status);
922 } else {
923 clear_bit (EVENT_RX_HALT, &dev->flags);
924 tasklet_schedule (&dev->bh);
925 }
926 }
927
928 /* tasklet could resubmit itself forever if memory is tight */
929 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
930 struct urb *urb = NULL;
931 int resched = 1;
932
933 if (netif_running (dev->net))
934 urb = usb_alloc_urb (0, GFP_KERNEL);
935 else
936 clear_bit (EVENT_RX_MEMORY, &dev->flags);
937 if (urb != NULL) {
938 clear_bit (EVENT_RX_MEMORY, &dev->flags);
939 status = usb_autopm_get_interface(dev->intf);
940 if (status < 0) {
941 usb_free_urb(urb);
942 goto fail_lowmem;
943 }
944 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
945 resched = 0;
946 usb_autopm_put_interface(dev->intf);
947fail_lowmem:
948 if (resched)
949 tasklet_schedule (&dev->bh);
950 }
951 }
952
953 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
954 struct driver_info *info = dev->driver_info;
955 int retval = 0;
956
957 clear_bit (EVENT_LINK_RESET, &dev->flags);
958 status = usb_autopm_get_interface(dev->intf);
959 if (status < 0)
960 goto skip_reset;
961 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
962 usb_autopm_put_interface(dev->intf);
963skip_reset:
964 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
965 retval,
966 dev->udev->bus->bus_name,
967 dev->udev->devpath,
968 info->description);
969 } else {
970 usb_autopm_put_interface(dev->intf);
971 }
972 }
973
974 if (dev->flags)
975 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
976}
977
978/*-------------------------------------------------------------------------*/
979
980static void tx_complete (struct urb *urb)
981{
982 struct sk_buff *skb = (struct sk_buff *) urb->context;
983 struct skb_data *entry = (struct skb_data *) skb->cb;
984 struct usbnet *dev = entry->dev;
985
986 if (urb->status == 0) {
987 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
988 dev->net->stats.tx_packets++;
989 dev->net->stats.tx_bytes += entry->length;
990 } else {
991 dev->net->stats.tx_errors++;
992
993 switch (urb->status) {
994 case -EPIPE:
995 usbnet_defer_kevent (dev, EVENT_TX_HALT);
996 break;
997
998 /* software-driven interface shutdown */
999 case -ECONNRESET: // async unlink
1000 case -ESHUTDOWN: // hardware gone
1001 break;
1002
1003 // like rx, tx gets controller i/o faults during khubd delays
1004 // and so it uses the same throttling mechanism.
1005 case -EPROTO:
1006 case -ETIME:
1007 case -EILSEQ:
1008 usb_mark_last_busy(dev->udev);
1009 if (!timer_pending (&dev->delay)) {
1010 mod_timer (&dev->delay,
1011 jiffies + THROTTLE_JIFFIES);
1012 netif_dbg(dev, link, dev->net,
1013 "tx throttle %d\n", urb->status);
1014 }
1015 netif_stop_queue (dev->net);
1016 break;
1017 default:
1018 netif_dbg(dev, tx_err, dev->net,
1019 "tx err %d\n", entry->urb->status);
1020 break;
1021 }
1022 }
1023
1024 usb_autopm_put_interface_async(dev->intf);
1025 urb->dev = NULL;
1026 entry->state = tx_done;
1027 defer_bh(dev, skb, &dev->txq);
1028}
1029
1030/*-------------------------------------------------------------------------*/
1031
1032void usbnet_tx_timeout (struct net_device *net)
1033{
1034 struct usbnet *dev = netdev_priv(net);
1035
1036 unlink_urbs (dev, &dev->txq);
1037 tasklet_schedule (&dev->bh);
1038
1039 // FIXME: device recovery -- reset?
1040}
1041EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1042
1043/*-------------------------------------------------------------------------*/
1044
1045netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1046 struct net_device *net)
1047{
1048 struct usbnet *dev = netdev_priv(net);
1049 int length;
1050 struct urb *urb = NULL;
1051 struct skb_data *entry;
1052 struct driver_info *info = dev->driver_info;
1053 unsigned long flags;
1054 int retval;
1055
1056 // some devices want funky USB-level framing, for
1057 // win32 driver (usually) and/or hardware quirks
1058 if (info->tx_fixup) {
1059 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1060 if (!skb) {
1061 if (netif_msg_tx_err(dev)) {
1062 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1063 goto drop;
1064 } else {
1065 /* cdc_ncm collected packet; waits for more */
1066 goto not_drop;
1067 }
1068 }
1069 }
1070 length = skb->len;
1071
1072 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1073 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1074 goto drop;
1075 }
1076
1077 entry = (struct skb_data *) skb->cb;
1078 entry->urb = urb;
1079 entry->dev = dev;
1080 entry->state = tx_start;
1081 entry->length = length;
1082
1083 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1084 skb->data, skb->len, tx_complete, skb);
1085
1086 /* don't assume the hardware handles USB_ZERO_PACKET
1087 * NOTE: strictly conforming cdc-ether devices should expect
1088 * the ZLP here, but ignore the one-byte packet.
1089 * NOTE2: CDC NCM specification is different from CDC ECM when
1090 * handling ZLP/short packets, so cdc_ncm driver will make short
1091 * packet itself if needed.
1092 */
1093 if (length % dev->maxpacket == 0) {
1094 if (!(info->flags & FLAG_SEND_ZLP)) {
1095 if (!(info->flags & FLAG_MULTI_PACKET)) {
1096 urb->transfer_buffer_length++;
1097 if (skb_tailroom(skb)) {
1098 skb->data[skb->len] = 0;
1099 __skb_put(skb, 1);
1100 }
1101 }
1102 } else
1103 urb->transfer_flags |= URB_ZERO_PACKET;
1104 }
1105
1106 spin_lock_irqsave(&dev->txq.lock, flags);
1107 retval = usb_autopm_get_interface_async(dev->intf);
1108 if (retval < 0) {
1109 spin_unlock_irqrestore(&dev->txq.lock, flags);
1110 goto drop;
1111 }
1112
1113#ifdef CONFIG_PM
1114 /* if this triggers the device is still a sleep */
1115 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1116 /* transmission will be done in resume */
1117 usb_anchor_urb(urb, &dev->deferred);
1118 /* no use to process more packets */
1119 netif_stop_queue(net);
1120 spin_unlock_irqrestore(&dev->txq.lock, flags);
1121 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1122 goto deferred;
1123 }
1124#endif
1125
1126 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1127 case -EPIPE:
1128 netif_stop_queue (net);
1129 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1130 usb_autopm_put_interface_async(dev->intf);
1131 break;
1132 default:
1133 usb_autopm_put_interface_async(dev->intf);
1134 netif_dbg(dev, tx_err, dev->net,
1135 "tx: submit urb err %d\n", retval);
1136 break;
1137 case 0:
1138 net->trans_start = jiffies;
1139 __skb_queue_tail (&dev->txq, skb);
1140 if (dev->txq.qlen >= TX_QLEN (dev))
1141 netif_stop_queue (net);
1142 }
1143 spin_unlock_irqrestore (&dev->txq.lock, flags);
1144
1145 if (retval) {
1146 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1147drop:
1148 dev->net->stats.tx_dropped++;
1149not_drop:
1150 if (skb)
1151 dev_kfree_skb_any (skb);
1152 usb_free_urb (urb);
1153 } else
1154 netif_dbg(dev, tx_queued, dev->net,
1155 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1156#ifdef CONFIG_PM
1157deferred:
1158#endif
1159 return NETDEV_TX_OK;
1160}
1161EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1162
1163/*-------------------------------------------------------------------------*/
1164
1165// tasklet (work deferred from completions, in_irq) or timer
1166
1167static void usbnet_bh (unsigned long param)
1168{
1169 struct usbnet *dev = (struct usbnet *) param;
1170 struct sk_buff *skb;
1171 struct skb_data *entry;
1172
1173 while ((skb = skb_dequeue (&dev->done))) {
1174 entry = (struct skb_data *) skb->cb;
1175 switch (entry->state) {
1176 case rx_done:
1177 entry->state = rx_cleanup;
1178 rx_process (dev, skb);
1179 continue;
1180 case tx_done:
1181 case rx_cleanup:
1182 usb_free_urb (entry->urb);
1183 dev_kfree_skb (skb);
1184 continue;
1185 default:
1186 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1187 }
1188 }
1189
1190 // waiting for all pending urbs to complete?
1191 if (dev->wait) {
1192 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1193 wake_up (dev->wait);
1194 }
1195
1196 // or are we maybe short a few urbs?
1197 } else if (netif_running (dev->net) &&
1198 netif_device_present (dev->net) &&
1199 !timer_pending (&dev->delay) &&
1200 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1201 int temp = dev->rxq.qlen;
1202 int qlen = RX_QLEN (dev);
1203
1204 if (temp < qlen) {
1205 struct urb *urb;
1206 int i;
1207
1208 // don't refill the queue all at once
1209 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1210 urb = usb_alloc_urb (0, GFP_ATOMIC);
1211 if (urb != NULL) {
1212 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1213 -ENOLINK)
1214 return;
1215 }
1216 }
1217 if (temp != dev->rxq.qlen)
1218 netif_dbg(dev, link, dev->net,
1219 "rxqlen %d --> %d\n",
1220 temp, dev->rxq.qlen);
1221 if (dev->rxq.qlen < qlen)
1222 tasklet_schedule (&dev->bh);
1223 }
1224 if (dev->txq.qlen < TX_QLEN (dev))
1225 netif_wake_queue (dev->net);
1226 }
1227}
1228
1229
1230/*-------------------------------------------------------------------------
1231 *
1232 * USB Device Driver support
1233 *
1234 *-------------------------------------------------------------------------*/
1235
1236// precondition: never called in_interrupt
1237
1238void usbnet_disconnect (struct usb_interface *intf)
1239{
1240 struct usbnet *dev;
1241 struct usb_device *xdev;
1242 struct net_device *net;
1243
1244 dev = usb_get_intfdata(intf);
1245 usb_set_intfdata(intf, NULL);
1246 if (!dev)
1247 return;
1248
1249 xdev = interface_to_usbdev (intf);
1250
1251 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1252 intf->dev.driver->name,
1253 xdev->bus->bus_name, xdev->devpath,
1254 dev->driver_info->description);
1255
1256 net = dev->net;
1257 unregister_netdev (net);
1258
1259 cancel_work_sync(&dev->kevent);
1260
1261 if (dev->driver_info->unbind)
1262 dev->driver_info->unbind (dev, intf);
1263
1264 usb_kill_urb(dev->interrupt);
1265 usb_free_urb(dev->interrupt);
1266
1267 free_netdev(net);
1268 usb_put_dev (xdev);
1269}
1270EXPORT_SYMBOL_GPL(usbnet_disconnect);
1271
1272static const struct net_device_ops usbnet_netdev_ops = {
1273 .ndo_open = usbnet_open,
1274 .ndo_stop = usbnet_stop,
1275 .ndo_start_xmit = usbnet_start_xmit,
1276 .ndo_tx_timeout = usbnet_tx_timeout,
1277 .ndo_change_mtu = usbnet_change_mtu,
1278 .ndo_set_mac_address = eth_mac_addr,
1279 .ndo_validate_addr = eth_validate_addr,
1280};
1281
1282/*-------------------------------------------------------------------------*/
1283
1284// precondition: never called in_interrupt
1285
1286static struct device_type wlan_type = {
1287 .name = "wlan",
1288};
1289
1290static struct device_type wwan_type = {
1291 .name = "wwan",
1292};
1293
1294int
1295usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1296{
1297 struct usbnet *dev;
1298 struct net_device *net;
1299 struct usb_host_interface *interface;
1300 struct driver_info *info;
1301 struct usb_device *xdev;
1302 int status;
1303 const char *name;
1304 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1305
1306 /* usbnet already took usb runtime pm, so have to enable the feature
1307 * for usb interface, otherwise usb_autopm_get_interface may return
1308 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1309 */
1310 if (!driver->supports_autosuspend) {
1311 driver->supports_autosuspend = 1;
1312 pm_runtime_enable(&udev->dev);
1313 }
1314
1315 name = udev->dev.driver->name;
1316 info = (struct driver_info *) prod->driver_info;
1317 if (!info) {
1318 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1319 return -ENODEV;
1320 }
1321 xdev = interface_to_usbdev (udev);
1322 interface = udev->cur_altsetting;
1323
1324 usb_get_dev (xdev);
1325
1326 status = -ENOMEM;
1327
1328 // set up our own records
1329 net = alloc_etherdev(sizeof(*dev));
1330 if (!net) {
1331 dbg ("can't kmalloc dev");
1332 goto out;
1333 }
1334
1335 /* netdev_printk() needs this so do it as early as possible */
1336 SET_NETDEV_DEV(net, &udev->dev);
1337
1338 dev = netdev_priv(net);
1339 dev->udev = xdev;
1340 dev->intf = udev;
1341 dev->driver_info = info;
1342 dev->driver_name = name;
1343 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1344 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1345 skb_queue_head_init (&dev->rxq);
1346 skb_queue_head_init (&dev->txq);
1347 skb_queue_head_init (&dev->done);
1348 skb_queue_head_init(&dev->rxq_pause);
1349 dev->bh.func = usbnet_bh;
1350 dev->bh.data = (unsigned long) dev;
1351 INIT_WORK (&dev->kevent, kevent);
1352 init_usb_anchor(&dev->deferred);
1353 dev->delay.function = usbnet_bh;
1354 dev->delay.data = (unsigned long) dev;
1355 init_timer (&dev->delay);
1356 mutex_init (&dev->phy_mutex);
1357
1358 dev->net = net;
1359 strcpy (net->name, "usb%d");
1360 memcpy (net->dev_addr, node_id, sizeof node_id);
1361
1362 /* rx and tx sides can use different message sizes;
1363 * bind() should set rx_urb_size in that case.
1364 */
1365 dev->hard_mtu = net->mtu + net->hard_header_len;
1366#if 0
1367// dma_supported() is deeply broken on almost all architectures
1368 // possible with some EHCI controllers
1369 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1370 net->features |= NETIF_F_HIGHDMA;
1371#endif
1372
1373 net->netdev_ops = &usbnet_netdev_ops;
1374 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1375 net->ethtool_ops = &usbnet_ethtool_ops;
1376
1377 // allow device-specific bind/init procedures
1378 // NOTE net->name still not usable ...
1379 if (info->bind) {
1380 status = info->bind (dev, udev);
1381 if (status < 0)
1382 goto out1;
1383
1384 // heuristic: "usb%d" for links we know are two-host,
1385 // else "eth%d" when there's reasonable doubt. userspace
1386 // can rename the link if it knows better.
1387 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1388 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1389 (net->dev_addr [0] & 0x02) == 0))
1390 strcpy (net->name, "eth%d");
1391 /* WLAN devices should always be named "wlan%d" */
1392 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1393 strcpy(net->name, "wlan%d");
1394 /* WWAN devices should always be named "wwan%d" */
1395 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1396 strcpy(net->name, "wwan%d");
1397
1398 /* maybe the remote can't receive an Ethernet MTU */
1399 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1400 net->mtu = dev->hard_mtu - net->hard_header_len;
1401 } else if (!info->in || !info->out)
1402 status = usbnet_get_endpoints (dev, udev);
1403 else {
1404 dev->in = usb_rcvbulkpipe (xdev, info->in);
1405 dev->out = usb_sndbulkpipe (xdev, info->out);
1406 if (!(info->flags & FLAG_NO_SETINT))
1407 status = usb_set_interface (xdev,
1408 interface->desc.bInterfaceNumber,
1409 interface->desc.bAlternateSetting);
1410 else
1411 status = 0;
1412
1413 }
1414 if (status >= 0 && dev->status)
1415 status = init_status (dev, udev);
1416 if (status < 0)
1417 goto out3;
1418
1419 if (!dev->rx_urb_size)
1420 dev->rx_urb_size = dev->hard_mtu;
1421 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1422
1423 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1424 SET_NETDEV_DEVTYPE(net, &wlan_type);
1425 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1426 SET_NETDEV_DEVTYPE(net, &wwan_type);
1427
1428 status = register_netdev (net);
1429 if (status)
1430 goto out3;
1431 netif_info(dev, probe, dev->net,
1432 "register '%s' at usb-%s-%s, %s, %pM\n",
1433 udev->dev.driver->name,
1434 xdev->bus->bus_name, xdev->devpath,
1435 dev->driver_info->description,
1436 net->dev_addr);
1437
1438 // ok, it's ready to go.
1439 usb_set_intfdata (udev, dev);
1440
1441 netif_device_attach (net);
1442
1443 if (dev->driver_info->flags & FLAG_LINK_INTR)
1444 netif_carrier_off(net);
1445
1446 return 0;
1447
1448out3:
1449 if (info->unbind)
1450 info->unbind (dev, udev);
1451out1:
1452 free_netdev(net);
1453out:
1454 usb_put_dev(xdev);
1455 return status;
1456}
1457EXPORT_SYMBOL_GPL(usbnet_probe);
1458
1459/*-------------------------------------------------------------------------*/
1460
1461/*
1462 * suspend the whole driver as soon as the first interface is suspended
1463 * resume only when the last interface is resumed
1464 */
1465
1466int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1467{
1468 struct usbnet *dev = usb_get_intfdata(intf);
1469
1470 if (!dev->suspend_count++) {
1471 spin_lock_irq(&dev->txq.lock);
1472 /* don't autosuspend while transmitting */
1473 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1474 spin_unlock_irq(&dev->txq.lock);
1475 return -EBUSY;
1476 } else {
1477 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1478 spin_unlock_irq(&dev->txq.lock);
1479 }
1480 /*
1481 * accelerate emptying of the rx and queues, to avoid
1482 * having everything error out.
1483 */
1484 netif_device_detach (dev->net);
1485 usbnet_terminate_urbs(dev);
1486 usb_kill_urb(dev->interrupt);
1487
1488 /*
1489 * reattach so runtime management can use and
1490 * wake the device
1491 */
1492 netif_device_attach (dev->net);
1493 }
1494 return 0;
1495}
1496EXPORT_SYMBOL_GPL(usbnet_suspend);
1497
1498int usbnet_resume (struct usb_interface *intf)
1499{
1500 struct usbnet *dev = usb_get_intfdata(intf);
1501 struct sk_buff *skb;
1502 struct urb *res;
1503 int retval;
1504
1505 if (!--dev->suspend_count) {
1506 /* resume interrupt URBs */
1507 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1508 usb_submit_urb(dev->interrupt, GFP_NOIO);
1509
1510 spin_lock_irq(&dev->txq.lock);
1511 while ((res = usb_get_from_anchor(&dev->deferred))) {
1512
1513 skb = (struct sk_buff *)res->context;
1514 retval = usb_submit_urb(res, GFP_ATOMIC);
1515 if (retval < 0) {
1516 dev_kfree_skb_any(skb);
1517 usb_free_urb(res);
1518 usb_autopm_put_interface_async(dev->intf);
1519 } else {
1520 dev->net->trans_start = jiffies;
1521 __skb_queue_tail(&dev->txq, skb);
1522 }
1523 }
1524
1525 smp_mb();
1526 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1527 spin_unlock_irq(&dev->txq.lock);
1528
1529 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1530 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1531 netif_start_queue(dev->net);
1532 tasklet_schedule (&dev->bh);
1533 }
1534 }
1535 return 0;
1536}
1537EXPORT_SYMBOL_GPL(usbnet_resume);
1538
1539
1540/*-------------------------------------------------------------------------*/
1541
1542static int __init usbnet_init(void)
1543{
1544 /* Compiler should optimize this out. */
1545 BUILD_BUG_ON(
1546 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1547
1548 random_ether_addr(node_id);
1549 return 0;
1550}
1551module_init(usbnet_init);
1552
1553static void __exit usbnet_exit(void)
1554{
1555}
1556module_exit(usbnet_exit);
1557
1558MODULE_AUTHOR("David Brownell");
1559MODULE_DESCRIPTION("USB network driver framework");
1560MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * USB Network driver infrastructure
4 * Copyright (C) 2000-2005 by David Brownell
5 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
6 */
7
8/*
9 * This is a generic "USB networking" framework that works with several
10 * kinds of full and high speed networking devices: host-to-host cables,
11 * smart usb peripherals, and actual Ethernet adapters.
12 *
13 * These devices usually differ in terms of control protocols (if they
14 * even have one!) and sometimes they define new framing to wrap or batch
15 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
16 * so interface (un)binding, endpoint I/O queues, fault handling, and other
17 * issues can usefully be addressed by this framework.
18 */
19
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/netdevice.h>
23#include <linux/etherdevice.h>
24#include <linux/ctype.h>
25#include <linux/ethtool.h>
26#include <linux/workqueue.h>
27#include <linux/mii.h>
28#include <linux/usb.h>
29#include <linux/usb/usbnet.h>
30#include <linux/slab.h>
31#include <linux/kernel.h>
32#include <linux/pm_runtime.h>
33
34/*-------------------------------------------------------------------------*/
35
36/*
37 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
38 * Several dozen bytes of IPv4 data can fit in two such transactions.
39 * One maximum size Ethernet packet takes twenty four of them.
40 * For high speed, each frame comfortably fits almost 36 max size
41 * Ethernet packets (so queues should be bigger).
42 *
43 * The goal is to let the USB host controller be busy for 5msec or
44 * more before an irq is required, under load. Jumbograms change
45 * the equation.
46 */
47#define MAX_QUEUE_MEMORY (60 * 1518)
48#define RX_QLEN(dev) ((dev)->rx_qlen)
49#define TX_QLEN(dev) ((dev)->tx_qlen)
50
51// reawaken network queue this soon after stopping; else watchdog barks
52#define TX_TIMEOUT_JIFFIES (5*HZ)
53
54/* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
55 * us (it polls at HZ/4 usually) before we report too many false errors.
56 */
57#define THROTTLE_JIFFIES (HZ/8)
58
59// between wakeups
60#define UNLINK_TIMEOUT_MS 3
61
62/*-------------------------------------------------------------------------*/
63
64/* use ethtool to change the level for any given device */
65static int msg_level = -1;
66module_param (msg_level, int, 0);
67MODULE_PARM_DESC (msg_level, "Override default message level");
68
69/*-------------------------------------------------------------------------*/
70
71static const char * const usbnet_event_names[] = {
72 [EVENT_TX_HALT] = "EVENT_TX_HALT",
73 [EVENT_RX_HALT] = "EVENT_RX_HALT",
74 [EVENT_RX_MEMORY] = "EVENT_RX_MEMORY",
75 [EVENT_STS_SPLIT] = "EVENT_STS_SPLIT",
76 [EVENT_LINK_RESET] = "EVENT_LINK_RESET",
77 [EVENT_RX_PAUSED] = "EVENT_RX_PAUSED",
78 [EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP",
79 [EVENT_DEV_OPEN] = "EVENT_DEV_OPEN",
80 [EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE",
81 [EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM",
82 [EVENT_RX_KILL] = "EVENT_RX_KILL",
83 [EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE",
84 [EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE",
85 [EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN",
86};
87
88/* handles CDC Ethernet and many other network "bulk data" interfaces */
89int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
90{
91 int tmp;
92 struct usb_host_interface *alt = NULL;
93 struct usb_host_endpoint *in = NULL, *out = NULL;
94 struct usb_host_endpoint *status = NULL;
95
96 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
97 unsigned ep;
98
99 in = out = status = NULL;
100 alt = intf->altsetting + tmp;
101
102 /* take the first altsetting with in-bulk + out-bulk;
103 * remember any status endpoint, just in case;
104 * ignore other endpoints and altsettings.
105 */
106 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
107 struct usb_host_endpoint *e;
108 int intr = 0;
109
110 e = alt->endpoint + ep;
111
112 /* ignore endpoints which cannot transfer data */
113 if (!usb_endpoint_maxp(&e->desc))
114 continue;
115
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
118 if (!usb_endpoint_dir_in(&e->desc))
119 continue;
120 intr = 1;
121 fallthrough;
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
127 if (usb_endpoint_dir_in(&e->desc)) {
128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
143 if (alt->desc.bAlternateSetting != 0 ||
144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
146 alt->desc.bAlternateSetting);
147 if (tmp < 0)
148 return tmp;
149 }
150
151 dev->in = usb_rcvbulkpipe (dev->udev,
152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
153 dev->out = usb_sndbulkpipe (dev->udev,
154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->status = status;
156 return 0;
157}
158EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159
160int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
161{
162 u8 addr[ETH_ALEN];
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(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 eth_hw_addr_set(dev->net, addr);
177 return 0;
178}
179EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
180
181static void intr_complete (struct urb *urb)
182{
183 struct usbnet *dev = urb->context;
184 int status = urb->status;
185
186 switch (status) {
187 /* success */
188 case 0:
189 dev->driver_info->status(dev, urb);
190 break;
191
192 /* software-driven interface shutdown */
193 case -ENOENT: /* urb killed */
194 case -ESHUTDOWN: /* hardware gone */
195 netif_dbg(dev, ifdown, dev->net,
196 "intr shutdown, code %d\n", status);
197 return;
198
199 /* NOTE: not throttling like RX/TX, since this endpoint
200 * already polls infrequently
201 */
202 default:
203 netdev_dbg(dev->net, "intr status %d\n", status);
204 break;
205 }
206
207 status = usb_submit_urb (urb, GFP_ATOMIC);
208 if (status != 0)
209 netif_err(dev, timer, dev->net,
210 "intr resubmit --> %d\n", status);
211}
212
213static int init_status (struct usbnet *dev, struct usb_interface *intf)
214{
215 char *buf = NULL;
216 unsigned pipe = 0;
217 unsigned maxp;
218 unsigned period;
219
220 if (!dev->driver_info->status)
221 return 0;
222
223 pipe = usb_rcvintpipe (dev->udev,
224 dev->status->desc.bEndpointAddress
225 & USB_ENDPOINT_NUMBER_MASK);
226 maxp = usb_maxpacket(dev->udev, pipe);
227
228 /* avoid 1 msec chatter: min 8 msec poll rate */
229 period = max ((int) dev->status->desc.bInterval,
230 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
231
232 buf = kmalloc (maxp, GFP_KERNEL);
233 if (buf) {
234 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
235 if (!dev->interrupt) {
236 kfree (buf);
237 return -ENOMEM;
238 } else {
239 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
240 buf, maxp, intr_complete, dev, period);
241 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
242 dev_dbg(&intf->dev,
243 "status ep%din, %d bytes period %d\n",
244 usb_pipeendpoint(pipe), maxp, period);
245 }
246 }
247 return 0;
248}
249
250/* Submit the interrupt URB if not previously submitted, increasing refcount */
251int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
252{
253 int ret = 0;
254
255 WARN_ON_ONCE(dev->interrupt == NULL);
256 if (dev->interrupt) {
257 mutex_lock(&dev->interrupt_mutex);
258
259 if (++dev->interrupt_count == 1)
260 ret = usb_submit_urb(dev->interrupt, mem_flags);
261
262 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
263 dev->interrupt_count);
264 mutex_unlock(&dev->interrupt_mutex);
265 }
266 return ret;
267}
268EXPORT_SYMBOL_GPL(usbnet_status_start);
269
270/* For resume; submit interrupt URB if previously submitted */
271static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
272{
273 int ret = 0;
274
275 mutex_lock(&dev->interrupt_mutex);
276 if (dev->interrupt_count) {
277 ret = usb_submit_urb(dev->interrupt, mem_flags);
278 dev_dbg(&dev->udev->dev,
279 "submitted interrupt URB for resume\n");
280 }
281 mutex_unlock(&dev->interrupt_mutex);
282 return ret;
283}
284
285/* Kill the interrupt URB if all submitters want it killed */
286void usbnet_status_stop(struct usbnet *dev)
287{
288 if (dev->interrupt) {
289 mutex_lock(&dev->interrupt_mutex);
290 WARN_ON(dev->interrupt_count == 0);
291
292 if (dev->interrupt_count && --dev->interrupt_count == 0)
293 usb_kill_urb(dev->interrupt);
294
295 dev_dbg(&dev->udev->dev,
296 "decremented interrupt URB count to %d\n",
297 dev->interrupt_count);
298 mutex_unlock(&dev->interrupt_mutex);
299 }
300}
301EXPORT_SYMBOL_GPL(usbnet_status_stop);
302
303/* For suspend; always kill interrupt URB */
304static void __usbnet_status_stop_force(struct usbnet *dev)
305{
306 if (dev->interrupt) {
307 mutex_lock(&dev->interrupt_mutex);
308 usb_kill_urb(dev->interrupt);
309 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
310 mutex_unlock(&dev->interrupt_mutex);
311 }
312}
313
314/* Passes this packet up the stack, updating its accounting.
315 * Some link protocols batch packets, so their rx_fixup paths
316 * can return clones as well as just modify the original skb.
317 */
318void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
319{
320 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
321 unsigned long flags;
322 int status;
323
324 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
325 skb_queue_tail(&dev->rxq_pause, skb);
326 return;
327 }
328
329 /* only update if unset to allow minidriver rx_fixup override */
330 if (skb->protocol == 0)
331 skb->protocol = eth_type_trans (skb, dev->net);
332
333 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
334 u64_stats_inc(&stats64->rx_packets);
335 u64_stats_add(&stats64->rx_bytes, skb->len);
336 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
337
338 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
339 skb->len + sizeof (struct ethhdr), skb->protocol);
340 memset (skb->cb, 0, sizeof (struct skb_data));
341
342 if (skb_defer_rx_timestamp(skb))
343 return;
344
345 status = netif_rx (skb);
346 if (status != NET_RX_SUCCESS)
347 netif_dbg(dev, rx_err, dev->net,
348 "netif_rx status %d\n", status);
349}
350EXPORT_SYMBOL_GPL(usbnet_skb_return);
351
352/* must be called if hard_mtu or rx_urb_size changed */
353void usbnet_update_max_qlen(struct usbnet *dev)
354{
355 enum usb_device_speed speed = dev->udev->speed;
356
357 if (!dev->rx_urb_size || !dev->hard_mtu)
358 goto insanity;
359 switch (speed) {
360 case USB_SPEED_HIGH:
361 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
362 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
363 break;
364 case USB_SPEED_SUPER:
365 case USB_SPEED_SUPER_PLUS:
366 /*
367 * Not take default 5ms qlen for super speed HC to
368 * save memory, and iperf tests show 2.5ms qlen can
369 * work well
370 */
371 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
372 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
373 break;
374 default:
375insanity:
376 dev->rx_qlen = dev->tx_qlen = 4;
377 }
378}
379EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
380
381
382/*-------------------------------------------------------------------------
383 *
384 * Network Device Driver (peer link to "Host Device", from USB host)
385 *
386 *-------------------------------------------------------------------------*/
387
388int usbnet_change_mtu (struct net_device *net, int new_mtu)
389{
390 struct usbnet *dev = netdev_priv(net);
391 int ll_mtu = new_mtu + net->hard_header_len;
392 int old_hard_mtu = dev->hard_mtu;
393 int old_rx_urb_size = dev->rx_urb_size;
394
395 // no second zero-length packet read wanted after mtu-sized packets
396 if ((ll_mtu % dev->maxpacket) == 0)
397 return -EDOM;
398 WRITE_ONCE(net->mtu, new_mtu);
399
400 dev->hard_mtu = net->mtu + net->hard_header_len;
401 if (dev->rx_urb_size == old_hard_mtu) {
402 dev->rx_urb_size = dev->hard_mtu;
403 if (dev->rx_urb_size > old_rx_urb_size) {
404 usbnet_pause_rx(dev);
405 usbnet_unlink_rx_urbs(dev);
406 usbnet_resume_rx(dev);
407 }
408 }
409
410 /* max qlen depend on hard_mtu and rx_urb_size */
411 usbnet_update_max_qlen(dev);
412
413 return 0;
414}
415EXPORT_SYMBOL_GPL(usbnet_change_mtu);
416
417/* The caller must hold list->lock */
418static void __usbnet_queue_skb(struct sk_buff_head *list,
419 struct sk_buff *newsk, enum skb_state state)
420{
421 struct skb_data *entry = (struct skb_data *) newsk->cb;
422
423 __skb_queue_tail(list, newsk);
424 entry->state = state;
425}
426
427/*-------------------------------------------------------------------------*/
428
429/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
430 * completion callbacks. 2.5 should have fixed those bugs...
431 */
432
433static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
434 struct sk_buff_head *list, enum skb_state state)
435{
436 unsigned long flags;
437 enum skb_state old_state;
438 struct skb_data *entry = (struct skb_data *) skb->cb;
439
440 spin_lock_irqsave(&list->lock, flags);
441 old_state = entry->state;
442 entry->state = state;
443 __skb_unlink(skb, list);
444
445 /* defer_bh() is never called with list == &dev->done.
446 * spin_lock_nested() tells lockdep that it is OK to take
447 * dev->done.lock here with list->lock held.
448 */
449 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
450
451 __skb_queue_tail(&dev->done, skb);
452 if (dev->done.qlen == 1)
453 tasklet_schedule(&dev->bh);
454 spin_unlock(&dev->done.lock);
455 spin_unlock_irqrestore(&list->lock, flags);
456 return old_state;
457}
458
459/* some work can't be done in tasklets, so we use keventd
460 *
461 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
462 * but tasklet_schedule() doesn't. hope the failure is rare.
463 */
464void usbnet_defer_kevent (struct usbnet *dev, int work)
465{
466 set_bit (work, &dev->flags);
467 if (!usbnet_going_away(dev)) {
468 if (!schedule_work(&dev->kevent))
469 netdev_dbg(dev->net,
470 "kevent %s may have been dropped\n",
471 usbnet_event_names[work]);
472 else
473 netdev_dbg(dev->net,
474 "kevent %s scheduled\n", usbnet_event_names[work]);
475 }
476}
477EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
478
479/*-------------------------------------------------------------------------*/
480
481static void rx_complete (struct urb *urb);
482
483static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
484{
485 struct sk_buff *skb;
486 struct skb_data *entry;
487 int retval = 0;
488 unsigned long lockflags;
489 size_t size = dev->rx_urb_size;
490
491 /* prevent rx skb allocation when error ratio is high */
492 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
493 usb_free_urb(urb);
494 return -ENOLINK;
495 }
496
497 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
498 skb = __netdev_alloc_skb(dev->net, size, flags);
499 else
500 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
501 if (!skb) {
502 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
503 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
504 usb_free_urb (urb);
505 return -ENOMEM;
506 }
507
508 entry = (struct skb_data *) skb->cb;
509 entry->urb = urb;
510 entry->dev = dev;
511 entry->length = 0;
512
513 usb_fill_bulk_urb (urb, dev->udev, dev->in,
514 skb->data, size, rx_complete, skb);
515
516 spin_lock_irqsave (&dev->rxq.lock, lockflags);
517
518 if (netif_running (dev->net) &&
519 netif_device_present (dev->net) &&
520 test_bit(EVENT_DEV_OPEN, &dev->flags) &&
521 !test_bit (EVENT_RX_HALT, &dev->flags) &&
522 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
523 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
524 case -EPIPE:
525 usbnet_defer_kevent (dev, EVENT_RX_HALT);
526 break;
527 case -ENOMEM:
528 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
529 break;
530 case -ENODEV:
531 netif_dbg(dev, ifdown, dev->net, "device gone\n");
532 netif_device_detach (dev->net);
533 break;
534 case -EHOSTUNREACH:
535 retval = -ENOLINK;
536 break;
537 default:
538 netif_dbg(dev, rx_err, dev->net,
539 "rx submit, %d\n", retval);
540 tasklet_schedule (&dev->bh);
541 break;
542 case 0:
543 if (!usbnet_going_away(dev))
544 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
545 }
546 } else {
547 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
548 retval = -ENOLINK;
549 }
550 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
551 if (retval) {
552 dev_kfree_skb_any (skb);
553 usb_free_urb (urb);
554 }
555 return retval;
556}
557
558
559/*-------------------------------------------------------------------------*/
560
561static inline int rx_process(struct usbnet *dev, struct sk_buff *skb)
562{
563 if (dev->driver_info->rx_fixup &&
564 !dev->driver_info->rx_fixup (dev, skb)) {
565 /* With RX_ASSEMBLE, rx_fixup() must update counters */
566 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
567 dev->net->stats.rx_errors++;
568 return -EPROTO;
569 }
570 // else network stack removes extra byte if we forced a short packet
571
572 /* all data was already cloned from skb inside the driver */
573 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
574 return -EALREADY;
575
576 if (skb->len < ETH_HLEN) {
577 dev->net->stats.rx_errors++;
578 dev->net->stats.rx_length_errors++;
579 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
580 return -EPROTO;
581 }
582
583 usbnet_skb_return(dev, skb);
584 return 0;
585}
586
587/*-------------------------------------------------------------------------*/
588
589static void rx_complete (struct urb *urb)
590{
591 struct sk_buff *skb = (struct sk_buff *) urb->context;
592 struct skb_data *entry = (struct skb_data *) skb->cb;
593 struct usbnet *dev = entry->dev;
594 int urb_status = urb->status;
595 enum skb_state state;
596
597 skb_put (skb, urb->actual_length);
598 state = rx_done;
599 entry->urb = NULL;
600
601 switch (urb_status) {
602 /* success */
603 case 0:
604 break;
605
606 /* stalls need manual reset. this is rare ... except that
607 * when going through USB 2.0 TTs, unplug appears this way.
608 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
609 * storm, recovering as needed.
610 */
611 case -EPIPE:
612 dev->net->stats.rx_errors++;
613 usbnet_defer_kevent (dev, EVENT_RX_HALT);
614 fallthrough;
615
616 /* software-driven interface shutdown */
617 case -ECONNRESET: /* async unlink */
618 case -ESHUTDOWN: /* hardware gone */
619 netif_dbg(dev, ifdown, dev->net,
620 "rx shutdown, code %d\n", urb_status);
621 goto block;
622
623 /* we get controller i/o faults during hub_wq disconnect() delays.
624 * throttle down resubmits, to avoid log floods; just temporarily,
625 * so we still recover when the fault isn't a hub_wq delay.
626 */
627 case -EPROTO:
628 case -ETIME:
629 case -EILSEQ:
630 dev->net->stats.rx_errors++;
631 if (!timer_pending (&dev->delay)) {
632 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
633 netif_dbg(dev, link, dev->net,
634 "rx throttle %d\n", urb_status);
635 }
636block:
637 state = rx_cleanup;
638 entry->urb = urb;
639 urb = NULL;
640 break;
641
642 /* data overrun ... flush fifo? */
643 case -EOVERFLOW:
644 dev->net->stats.rx_over_errors++;
645 fallthrough;
646
647 default:
648 state = rx_cleanup;
649 dev->net->stats.rx_errors++;
650 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
651 break;
652 }
653
654 /* stop rx if packet error rate is high */
655 if (++dev->pkt_cnt > 30) {
656 dev->pkt_cnt = 0;
657 dev->pkt_err = 0;
658 } else {
659 if (state == rx_cleanup)
660 dev->pkt_err++;
661 if (dev->pkt_err > 20)
662 set_bit(EVENT_RX_KILL, &dev->flags);
663 }
664
665 state = defer_bh(dev, skb, &dev->rxq, state);
666
667 if (urb) {
668 if (netif_running (dev->net) &&
669 !test_bit (EVENT_RX_HALT, &dev->flags) &&
670 state != unlink_start) {
671 rx_submit (dev, urb, GFP_ATOMIC);
672 usb_mark_last_busy(dev->udev);
673 return;
674 }
675 usb_free_urb (urb);
676 }
677 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
678}
679
680/*-------------------------------------------------------------------------*/
681void usbnet_pause_rx(struct usbnet *dev)
682{
683 set_bit(EVENT_RX_PAUSED, &dev->flags);
684
685 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
686}
687EXPORT_SYMBOL_GPL(usbnet_pause_rx);
688
689void usbnet_resume_rx(struct usbnet *dev)
690{
691 struct sk_buff *skb;
692 int num = 0;
693
694 clear_bit(EVENT_RX_PAUSED, &dev->flags);
695
696 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
697 usbnet_skb_return(dev, skb);
698 num++;
699 }
700
701 tasklet_schedule(&dev->bh);
702
703 netif_dbg(dev, rx_status, dev->net,
704 "paused rx queue disabled, %d skbs requeued\n", num);
705}
706EXPORT_SYMBOL_GPL(usbnet_resume_rx);
707
708void usbnet_purge_paused_rxq(struct usbnet *dev)
709{
710 skb_queue_purge(&dev->rxq_pause);
711}
712EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
713
714/*-------------------------------------------------------------------------*/
715
716// unlink pending rx/tx; completion handlers do all other cleanup
717
718static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
719{
720 unsigned long flags;
721 struct sk_buff *skb;
722 int count = 0;
723
724 spin_lock_irqsave (&q->lock, flags);
725 while (!skb_queue_empty(q)) {
726 struct skb_data *entry;
727 struct urb *urb;
728 int retval;
729
730 skb_queue_walk(q, skb) {
731 entry = (struct skb_data *) skb->cb;
732 if (entry->state != unlink_start)
733 goto found;
734 }
735 break;
736found:
737 entry->state = unlink_start;
738 urb = entry->urb;
739
740 /*
741 * Get reference count of the URB to avoid it to be
742 * freed during usb_unlink_urb, which may trigger
743 * use-after-free problem inside usb_unlink_urb since
744 * usb_unlink_urb is always racing with .complete
745 * handler(include defer_bh).
746 */
747 usb_get_urb(urb);
748 spin_unlock_irqrestore(&q->lock, flags);
749 // during some PM-driven resume scenarios,
750 // these (async) unlinks complete immediately
751 retval = usb_unlink_urb (urb);
752 if (retval != -EINPROGRESS && retval != 0)
753 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
754 else
755 count++;
756 usb_put_urb(urb);
757 spin_lock_irqsave(&q->lock, flags);
758 }
759 spin_unlock_irqrestore (&q->lock, flags);
760 return count;
761}
762
763// Flush all pending rx urbs
764// minidrivers may need to do this when the MTU changes
765
766void usbnet_unlink_rx_urbs(struct usbnet *dev)
767{
768 if (netif_running(dev->net)) {
769 (void) unlink_urbs (dev, &dev->rxq);
770 tasklet_schedule(&dev->bh);
771 }
772}
773EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
774
775/*-------------------------------------------------------------------------*/
776
777static void wait_skb_queue_empty(struct sk_buff_head *q)
778{
779 unsigned long flags;
780
781 spin_lock_irqsave(&q->lock, flags);
782 while (!skb_queue_empty(q)) {
783 spin_unlock_irqrestore(&q->lock, flags);
784 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
785 set_current_state(TASK_UNINTERRUPTIBLE);
786 spin_lock_irqsave(&q->lock, flags);
787 }
788 spin_unlock_irqrestore(&q->lock, flags);
789}
790
791// precondition: never called in_interrupt
792static void usbnet_terminate_urbs(struct usbnet *dev)
793{
794 DECLARE_WAITQUEUE(wait, current);
795 int temp;
796
797 /* ensure there are no more active urbs */
798 add_wait_queue(&dev->wait, &wait);
799 set_current_state(TASK_UNINTERRUPTIBLE);
800 temp = unlink_urbs(dev, &dev->txq) +
801 unlink_urbs(dev, &dev->rxq);
802
803 /* maybe wait for deletions to finish. */
804 wait_skb_queue_empty(&dev->rxq);
805 wait_skb_queue_empty(&dev->txq);
806 wait_skb_queue_empty(&dev->done);
807 netif_dbg(dev, ifdown, dev->net,
808 "waited for %d urb completions\n", temp);
809 set_current_state(TASK_RUNNING);
810 remove_wait_queue(&dev->wait, &wait);
811}
812
813int usbnet_stop (struct net_device *net)
814{
815 struct usbnet *dev = netdev_priv(net);
816 const struct driver_info *info = dev->driver_info;
817 int retval, pm, mpn;
818
819 clear_bit(EVENT_DEV_OPEN, &dev->flags);
820 netif_stop_queue (net);
821
822 netif_info(dev, ifdown, dev->net,
823 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
824 net->stats.rx_packets, net->stats.tx_packets,
825 net->stats.rx_errors, net->stats.tx_errors);
826
827 /* to not race resume */
828 pm = usb_autopm_get_interface(dev->intf);
829 /* allow minidriver to stop correctly (wireless devices to turn off
830 * radio etc) */
831 if (info->stop) {
832 retval = info->stop(dev);
833 if (retval < 0)
834 netif_info(dev, ifdown, dev->net,
835 "stop fail (%d) usbnet usb-%s-%s, %s\n",
836 retval,
837 dev->udev->bus->bus_name, dev->udev->devpath,
838 info->description);
839 }
840
841 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
842 usbnet_terminate_urbs(dev);
843
844 usbnet_status_stop(dev);
845
846 usbnet_purge_paused_rxq(dev);
847
848 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
849
850 /* deferred work (timer, softirq, task) must also stop */
851 dev->flags = 0;
852 del_timer_sync(&dev->delay);
853 tasklet_kill(&dev->bh);
854 cancel_work_sync(&dev->kevent);
855
856 /* We have cyclic dependencies. Those calls are needed
857 * to break a cycle. We cannot fall into the gaps because
858 * we have a flag
859 */
860 tasklet_kill(&dev->bh);
861 del_timer_sync(&dev->delay);
862 cancel_work_sync(&dev->kevent);
863
864 if (!pm)
865 usb_autopm_put_interface(dev->intf);
866
867 if (info->manage_power && mpn)
868 info->manage_power(dev, 0);
869 else
870 usb_autopm_put_interface(dev->intf);
871
872 return 0;
873}
874EXPORT_SYMBOL_GPL(usbnet_stop);
875
876/*-------------------------------------------------------------------------*/
877
878// posts reads, and enables write queuing
879
880// precondition: never called in_interrupt
881
882int usbnet_open (struct net_device *net)
883{
884 struct usbnet *dev = netdev_priv(net);
885 int retval;
886 const struct driver_info *info = dev->driver_info;
887
888 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
889 netif_info(dev, ifup, dev->net,
890 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
891 retval,
892 dev->udev->bus->bus_name,
893 dev->udev->devpath,
894 info->description);
895 goto done_nopm;
896 }
897
898 // put into "known safe" state
899 if (info->reset && (retval = info->reset (dev)) < 0) {
900 netif_info(dev, ifup, dev->net,
901 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
902 retval,
903 dev->udev->bus->bus_name,
904 dev->udev->devpath,
905 info->description);
906 goto done;
907 }
908
909 /* hard_mtu or rx_urb_size may change in reset() */
910 usbnet_update_max_qlen(dev);
911
912 // insist peer be connected
913 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
914 netif_err(dev, ifup, dev->net, "can't open; %d\n", retval);
915 goto done;
916 }
917
918 /* start any status interrupt transfer */
919 if (dev->interrupt) {
920 retval = usbnet_status_start(dev, GFP_KERNEL);
921 if (retval < 0) {
922 netif_err(dev, ifup, dev->net,
923 "intr submit %d\n", retval);
924 goto done;
925 }
926 }
927
928 set_bit(EVENT_DEV_OPEN, &dev->flags);
929 netif_start_queue (net);
930 netif_info(dev, ifup, dev->net,
931 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
932 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
933 dev->net->mtu,
934 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
935 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
936 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
937 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
938 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
939 "simple");
940
941 /* reset rx error state */
942 dev->pkt_cnt = 0;
943 dev->pkt_err = 0;
944 clear_bit(EVENT_RX_KILL, &dev->flags);
945
946 // delay posting reads until we're fully open
947 tasklet_schedule (&dev->bh);
948 if (info->manage_power) {
949 retval = info->manage_power(dev, 1);
950 if (retval < 0) {
951 retval = 0;
952 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
953 } else {
954 usb_autopm_put_interface(dev->intf);
955 }
956 }
957 return retval;
958done:
959 usb_autopm_put_interface(dev->intf);
960done_nopm:
961 return retval;
962}
963EXPORT_SYMBOL_GPL(usbnet_open);
964
965/*-------------------------------------------------------------------------*/
966
967/* ethtool methods; minidrivers may need to add some more, but
968 * they'll probably want to use this base set.
969 */
970
971/* These methods are written on the assumption that the device
972 * uses MII
973 */
974int usbnet_get_link_ksettings_mii(struct net_device *net,
975 struct ethtool_link_ksettings *cmd)
976{
977 struct usbnet *dev = netdev_priv(net);
978
979 if (!dev->mii.mdio_read)
980 return -EOPNOTSUPP;
981
982 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
983
984 return 0;
985}
986EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii);
987
988int usbnet_get_link_ksettings_internal(struct net_device *net,
989 struct ethtool_link_ksettings *cmd)
990{
991 struct usbnet *dev = netdev_priv(net);
992
993 /* the assumption that speed is equal on tx and rx
994 * is deeply engrained into the networking layer.
995 * For wireless stuff it is not true.
996 * We assume that rx_speed matters more.
997 */
998 if (dev->rx_speed != SPEED_UNSET)
999 cmd->base.speed = dev->rx_speed / 1000000;
1000 else if (dev->tx_speed != SPEED_UNSET)
1001 cmd->base.speed = dev->tx_speed / 1000000;
1002 else
1003 cmd->base.speed = SPEED_UNKNOWN;
1004
1005 return 0;
1006}
1007EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
1008
1009int usbnet_set_link_ksettings_mii(struct net_device *net,
1010 const struct ethtool_link_ksettings *cmd)
1011{
1012 struct usbnet *dev = netdev_priv(net);
1013 int retval;
1014
1015 if (!dev->mii.mdio_write)
1016 return -EOPNOTSUPP;
1017
1018 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
1019
1020 /* link speed/duplex might have changed */
1021 if (dev->driver_info->link_reset)
1022 dev->driver_info->link_reset(dev);
1023
1024 /* hard_mtu or rx_urb_size may change in link_reset() */
1025 usbnet_update_max_qlen(dev);
1026
1027 return retval;
1028}
1029EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii);
1030
1031u32 usbnet_get_link (struct net_device *net)
1032{
1033 struct usbnet *dev = netdev_priv(net);
1034
1035 /* If a check_connect is defined, return its result */
1036 if (dev->driver_info->check_connect)
1037 return dev->driver_info->check_connect (dev) == 0;
1038
1039 /* if the device has mii operations, use those */
1040 if (dev->mii.mdio_read)
1041 return mii_link_ok(&dev->mii);
1042
1043 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
1044 return ethtool_op_get_link(net);
1045}
1046EXPORT_SYMBOL_GPL(usbnet_get_link);
1047
1048int usbnet_nway_reset(struct net_device *net)
1049{
1050 struct usbnet *dev = netdev_priv(net);
1051
1052 if (!dev->mii.mdio_write)
1053 return -EOPNOTSUPP;
1054
1055 return mii_nway_restart(&dev->mii);
1056}
1057EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1058
1059void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1060{
1061 struct usbnet *dev = netdev_priv(net);
1062
1063 strscpy(info->driver, dev->driver_name, sizeof(info->driver));
1064 strscpy(info->fw_version, dev->driver_info->description,
1065 sizeof(info->fw_version));
1066 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1067}
1068EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1069
1070u32 usbnet_get_msglevel (struct net_device *net)
1071{
1072 struct usbnet *dev = netdev_priv(net);
1073
1074 return dev->msg_enable;
1075}
1076EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1077
1078void usbnet_set_msglevel (struct net_device *net, u32 level)
1079{
1080 struct usbnet *dev = netdev_priv(net);
1081
1082 dev->msg_enable = level;
1083}
1084EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1085
1086/* drivers may override default ethtool_ops in their bind() routine */
1087static const struct ethtool_ops usbnet_ethtool_ops = {
1088 .get_link = usbnet_get_link,
1089 .nway_reset = usbnet_nway_reset,
1090 .get_drvinfo = usbnet_get_drvinfo,
1091 .get_msglevel = usbnet_get_msglevel,
1092 .set_msglevel = usbnet_set_msglevel,
1093 .get_ts_info = ethtool_op_get_ts_info,
1094 .get_link_ksettings = usbnet_get_link_ksettings_mii,
1095 .set_link_ksettings = usbnet_set_link_ksettings_mii,
1096};
1097
1098/*-------------------------------------------------------------------------*/
1099
1100static void __handle_link_change(struct usbnet *dev)
1101{
1102 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1103 return;
1104
1105 if (!netif_carrier_ok(dev->net)) {
1106 /* kill URBs for reading packets to save bus bandwidth */
1107 unlink_urbs(dev, &dev->rxq);
1108
1109 /*
1110 * tx_timeout will unlink URBs for sending packets and
1111 * tx queue is stopped by netcore after link becomes off
1112 */
1113 } else {
1114 /* submitting URBs for reading packets */
1115 tasklet_schedule(&dev->bh);
1116 }
1117
1118 /* hard_mtu or rx_urb_size may change during link change */
1119 usbnet_update_max_qlen(dev);
1120
1121 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1122}
1123
1124void usbnet_set_rx_mode(struct net_device *net)
1125{
1126 struct usbnet *dev = netdev_priv(net);
1127
1128 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1129}
1130EXPORT_SYMBOL_GPL(usbnet_set_rx_mode);
1131
1132static void __handle_set_rx_mode(struct usbnet *dev)
1133{
1134 if (dev->driver_info->set_rx_mode)
1135 (dev->driver_info->set_rx_mode)(dev);
1136
1137 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1138}
1139
1140/* work that cannot be done in interrupt context uses keventd.
1141 *
1142 * NOTE: with 2.5 we could do more of this using completion callbacks,
1143 * especially now that control transfers can be queued.
1144 */
1145static void
1146usbnet_deferred_kevent (struct work_struct *work)
1147{
1148 struct usbnet *dev =
1149 container_of(work, struct usbnet, kevent);
1150 int status;
1151
1152 /* usb_clear_halt() needs a thread context */
1153 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1154 unlink_urbs (dev, &dev->txq);
1155 status = usb_autopm_get_interface(dev->intf);
1156 if (status < 0)
1157 goto fail_pipe;
1158 status = usb_clear_halt (dev->udev, dev->out);
1159 usb_autopm_put_interface(dev->intf);
1160 if (status < 0 &&
1161 status != -EPIPE &&
1162 status != -ESHUTDOWN) {
1163 if (netif_msg_tx_err (dev))
1164fail_pipe:
1165 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1166 status);
1167 } else {
1168 clear_bit (EVENT_TX_HALT, &dev->flags);
1169 if (status != -ESHUTDOWN)
1170 netif_wake_queue (dev->net);
1171 }
1172 }
1173 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1174 unlink_urbs (dev, &dev->rxq);
1175 status = usb_autopm_get_interface(dev->intf);
1176 if (status < 0)
1177 goto fail_halt;
1178 status = usb_clear_halt (dev->udev, dev->in);
1179 usb_autopm_put_interface(dev->intf);
1180 if (status < 0 &&
1181 status != -EPIPE &&
1182 status != -ESHUTDOWN) {
1183 if (netif_msg_rx_err (dev))
1184fail_halt:
1185 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1186 status);
1187 } else {
1188 clear_bit (EVENT_RX_HALT, &dev->flags);
1189 if (!usbnet_going_away(dev))
1190 tasklet_schedule(&dev->bh);
1191 }
1192 }
1193
1194 /* tasklet could resubmit itself forever if memory is tight */
1195 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1196 struct urb *urb = NULL;
1197 int resched = 1;
1198
1199 if (netif_running (dev->net))
1200 urb = usb_alloc_urb (0, GFP_KERNEL);
1201 else
1202 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1203 if (urb != NULL) {
1204 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1205 status = usb_autopm_get_interface(dev->intf);
1206 if (status < 0) {
1207 usb_free_urb(urb);
1208 goto fail_lowmem;
1209 }
1210 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1211 resched = 0;
1212 usb_autopm_put_interface(dev->intf);
1213fail_lowmem:
1214 if (resched)
1215 if (!usbnet_going_away(dev))
1216 tasklet_schedule(&dev->bh);
1217 }
1218 }
1219
1220 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1221 const struct driver_info *info = dev->driver_info;
1222 int retval = 0;
1223
1224 clear_bit (EVENT_LINK_RESET, &dev->flags);
1225 status = usb_autopm_get_interface(dev->intf);
1226 if (status < 0)
1227 goto skip_reset;
1228 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1229 usb_autopm_put_interface(dev->intf);
1230skip_reset:
1231 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1232 retval,
1233 dev->udev->bus->bus_name,
1234 dev->udev->devpath,
1235 info->description);
1236 } else {
1237 usb_autopm_put_interface(dev->intf);
1238 }
1239
1240 /* handle link change from link resetting */
1241 __handle_link_change(dev);
1242 }
1243
1244 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1245 __handle_link_change(dev);
1246
1247 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1248 __handle_set_rx_mode(dev);
1249
1250
1251 if (dev->flags)
1252 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1253}
1254
1255/*-------------------------------------------------------------------------*/
1256
1257static void tx_complete (struct urb *urb)
1258{
1259 struct sk_buff *skb = (struct sk_buff *) urb->context;
1260 struct skb_data *entry = (struct skb_data *) skb->cb;
1261 struct usbnet *dev = entry->dev;
1262
1263 if (urb->status == 0) {
1264 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);
1265 unsigned long flags;
1266
1267 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
1268 u64_stats_add(&stats64->tx_packets, entry->packets);
1269 u64_stats_add(&stats64->tx_bytes, entry->length);
1270 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
1271 } else {
1272 dev->net->stats.tx_errors++;
1273
1274 switch (urb->status) {
1275 case -EPIPE:
1276 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1277 break;
1278
1279 /* software-driven interface shutdown */
1280 case -ECONNRESET: // async unlink
1281 case -ESHUTDOWN: // hardware gone
1282 break;
1283
1284 /* like rx, tx gets controller i/o faults during hub_wq
1285 * delays and so it uses the same throttling mechanism.
1286 */
1287 case -EPROTO:
1288 case -ETIME:
1289 case -EILSEQ:
1290 usb_mark_last_busy(dev->udev);
1291 if (!timer_pending (&dev->delay)) {
1292 mod_timer (&dev->delay,
1293 jiffies + THROTTLE_JIFFIES);
1294 netif_dbg(dev, link, dev->net,
1295 "tx throttle %d\n", urb->status);
1296 }
1297 netif_stop_queue (dev->net);
1298 break;
1299 default:
1300 netif_dbg(dev, tx_err, dev->net,
1301 "tx err %d\n", entry->urb->status);
1302 break;
1303 }
1304 }
1305
1306 usb_autopm_put_interface_async(dev->intf);
1307 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1308}
1309
1310/*-------------------------------------------------------------------------*/
1311
1312void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)
1313{
1314 struct usbnet *dev = netdev_priv(net);
1315
1316 unlink_urbs (dev, &dev->txq);
1317 tasklet_schedule (&dev->bh);
1318 /* this needs to be handled individually because the generic layer
1319 * doesn't know what is sufficient and could not restore private
1320 * information if a remedy of an unconditional reset were used.
1321 */
1322 if (dev->driver_info->recover)
1323 (dev->driver_info->recover)(dev);
1324}
1325EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1326
1327/*-------------------------------------------------------------------------*/
1328
1329static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1330{
1331 unsigned num_sgs, total_len = 0;
1332 int i, s = 0;
1333
1334 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1335 if (num_sgs == 1)
1336 return 0;
1337
1338 /* reserve one for zero packet */
1339 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),
1340 GFP_ATOMIC);
1341 if (!urb->sg)
1342 return -ENOMEM;
1343
1344 urb->num_sgs = num_sgs;
1345 sg_init_table(urb->sg, urb->num_sgs + 1);
1346
1347 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1348 total_len += skb_headlen(skb);
1349
1350 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1351 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1352
1353 total_len += skb_frag_size(f);
1354 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),
1355 skb_frag_off(f));
1356 }
1357 urb->transfer_buffer_length = total_len;
1358
1359 return 1;
1360}
1361
1362netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1363 struct net_device *net)
1364{
1365 struct usbnet *dev = netdev_priv(net);
1366 unsigned int length;
1367 struct urb *urb = NULL;
1368 struct skb_data *entry;
1369 const struct driver_info *info = dev->driver_info;
1370 unsigned long flags;
1371 int retval;
1372
1373 if (skb)
1374 skb_tx_timestamp(skb);
1375
1376 // some devices want funky USB-level framing, for
1377 // win32 driver (usually) and/or hardware quirks
1378 if (info->tx_fixup) {
1379 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1380 if (!skb) {
1381 /* packet collected; minidriver waiting for more */
1382 if (info->flags & FLAG_MULTI_PACKET)
1383 goto not_drop;
1384 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1385 goto drop;
1386 }
1387 }
1388
1389 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1390 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1391 goto drop;
1392 }
1393
1394 entry = (struct skb_data *) skb->cb;
1395 entry->urb = urb;
1396 entry->dev = dev;
1397
1398 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1399 skb->data, skb->len, tx_complete, skb);
1400 if (dev->can_dma_sg) {
1401 if (build_dma_sg(skb, urb) < 0)
1402 goto drop;
1403 }
1404 length = urb->transfer_buffer_length;
1405
1406 /* don't assume the hardware handles USB_ZERO_PACKET
1407 * NOTE: strictly conforming cdc-ether devices should expect
1408 * the ZLP here, but ignore the one-byte packet.
1409 * NOTE2: CDC NCM specification is different from CDC ECM when
1410 * handling ZLP/short packets, so cdc_ncm driver will make short
1411 * packet itself if needed.
1412 */
1413 if (length % dev->maxpacket == 0) {
1414 if (!(info->flags & FLAG_SEND_ZLP)) {
1415 if (!(info->flags & FLAG_MULTI_PACKET)) {
1416 length++;
1417 if (skb_tailroom(skb) && !urb->num_sgs) {
1418 skb->data[skb->len] = 0;
1419 __skb_put(skb, 1);
1420 } else if (urb->num_sgs)
1421 sg_set_buf(&urb->sg[urb->num_sgs++],
1422 dev->padding_pkt, 1);
1423 }
1424 } else
1425 urb->transfer_flags |= URB_ZERO_PACKET;
1426 }
1427 urb->transfer_buffer_length = length;
1428
1429 if (info->flags & FLAG_MULTI_PACKET) {
1430 /* Driver has set number of packets and a length delta.
1431 * Calculate the complete length and ensure that it's
1432 * positive.
1433 */
1434 entry->length += length;
1435 if (WARN_ON_ONCE(entry->length <= 0))
1436 entry->length = length;
1437 } else {
1438 usbnet_set_skb_tx_stats(skb, 1, length);
1439 }
1440
1441 spin_lock_irqsave(&dev->txq.lock, flags);
1442 retval = usb_autopm_get_interface_async(dev->intf);
1443 if (retval < 0) {
1444 spin_unlock_irqrestore(&dev->txq.lock, flags);
1445 goto drop;
1446 }
1447 if (netif_queue_stopped(net)) {
1448 usb_autopm_put_interface_async(dev->intf);
1449 spin_unlock_irqrestore(&dev->txq.lock, flags);
1450 goto drop;
1451 }
1452
1453#ifdef CONFIG_PM
1454 /* if this triggers the device is still a sleep */
1455 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1456 /* transmission will be done in resume */
1457 usb_anchor_urb(urb, &dev->deferred);
1458 /* no use to process more packets */
1459 netif_stop_queue(net);
1460 usb_put_urb(urb);
1461 spin_unlock_irqrestore(&dev->txq.lock, flags);
1462 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1463 goto deferred;
1464 }
1465#endif
1466
1467 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1468 case -EPIPE:
1469 netif_stop_queue (net);
1470 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1471 usb_autopm_put_interface_async(dev->intf);
1472 break;
1473 default:
1474 usb_autopm_put_interface_async(dev->intf);
1475 netif_dbg(dev, tx_err, dev->net,
1476 "tx: submit urb err %d\n", retval);
1477 break;
1478 case 0:
1479 netif_trans_update(net);
1480 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1481 if (dev->txq.qlen >= TX_QLEN (dev))
1482 netif_stop_queue (net);
1483 }
1484 spin_unlock_irqrestore (&dev->txq.lock, flags);
1485
1486 if (retval) {
1487 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1488drop:
1489 dev->net->stats.tx_dropped++;
1490not_drop:
1491 if (skb)
1492 dev_kfree_skb_any (skb);
1493 if (urb) {
1494 kfree(urb->sg);
1495 usb_free_urb(urb);
1496 }
1497 } else
1498 netif_dbg(dev, tx_queued, dev->net,
1499 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1500#ifdef CONFIG_PM
1501deferred:
1502#endif
1503 return NETDEV_TX_OK;
1504}
1505EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1506
1507static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1508{
1509 struct urb *urb;
1510 int i;
1511 int ret = 0;
1512
1513 /* don't refill the queue all at once */
1514 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1515 urb = usb_alloc_urb(0, flags);
1516 if (urb != NULL) {
1517 ret = rx_submit(dev, urb, flags);
1518 if (ret)
1519 goto err;
1520 } else {
1521 ret = -ENOMEM;
1522 goto err;
1523 }
1524 }
1525err:
1526 return ret;
1527}
1528
1529static inline void usb_free_skb(struct sk_buff *skb)
1530{
1531 struct skb_data *entry = (struct skb_data *)skb->cb;
1532
1533 usb_free_urb(entry->urb);
1534 dev_kfree_skb(skb);
1535}
1536
1537/*-------------------------------------------------------------------------*/
1538
1539// tasklet (work deferred from completions, in_irq) or timer
1540
1541static void usbnet_bh (struct timer_list *t)
1542{
1543 struct usbnet *dev = from_timer(dev, t, delay);
1544 struct sk_buff *skb;
1545 struct skb_data *entry;
1546
1547 while ((skb = skb_dequeue (&dev->done))) {
1548 entry = (struct skb_data *) skb->cb;
1549 switch (entry->state) {
1550 case rx_done:
1551 if (rx_process(dev, skb))
1552 usb_free_skb(skb);
1553 continue;
1554 case tx_done:
1555 kfree(entry->urb->sg);
1556 fallthrough;
1557 case rx_cleanup:
1558 usb_free_skb(skb);
1559 continue;
1560 default:
1561 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1562 }
1563 }
1564
1565 /* restart RX again after disabling due to high error rate */
1566 clear_bit(EVENT_RX_KILL, &dev->flags);
1567
1568 /* waiting for all pending urbs to complete?
1569 * only then can we forgo submitting anew
1570 */
1571 if (waitqueue_active(&dev->wait)) {
1572 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1573 wake_up_all(&dev->wait);
1574
1575 // or are we maybe short a few urbs?
1576 } else if (netif_running (dev->net) &&
1577 netif_device_present (dev->net) &&
1578 netif_carrier_ok(dev->net) &&
1579 !usbnet_going_away(dev) &&
1580 !timer_pending(&dev->delay) &&
1581 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1582 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1583 int temp = dev->rxq.qlen;
1584
1585 if (temp < RX_QLEN(dev)) {
1586 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1587 return;
1588 if (temp != dev->rxq.qlen)
1589 netif_dbg(dev, link, dev->net,
1590 "rxqlen %d --> %d\n",
1591 temp, dev->rxq.qlen);
1592 if (dev->rxq.qlen < RX_QLEN(dev))
1593 tasklet_schedule (&dev->bh);
1594 }
1595 if (dev->txq.qlen < TX_QLEN (dev))
1596 netif_wake_queue (dev->net);
1597 }
1598}
1599
1600static void usbnet_bh_tasklet(struct tasklet_struct *t)
1601{
1602 struct usbnet *dev = from_tasklet(dev, t, bh);
1603
1604 usbnet_bh(&dev->delay);
1605}
1606
1607
1608/*-------------------------------------------------------------------------
1609 *
1610 * USB Device Driver support
1611 *
1612 *-------------------------------------------------------------------------*/
1613
1614// precondition: never called in_interrupt
1615
1616void usbnet_disconnect (struct usb_interface *intf)
1617{
1618 struct usbnet *dev;
1619 struct usb_device *xdev;
1620 struct net_device *net;
1621 struct urb *urb;
1622
1623 dev = usb_get_intfdata(intf);
1624 usb_set_intfdata(intf, NULL);
1625 if (!dev)
1626 return;
1627 usbnet_mark_going_away(dev);
1628
1629 xdev = interface_to_usbdev (intf);
1630
1631 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1632 intf->dev.driver->name,
1633 xdev->bus->bus_name, xdev->devpath,
1634 dev->driver_info->description);
1635
1636 net = dev->net;
1637 unregister_netdev (net);
1638
1639 while ((urb = usb_get_from_anchor(&dev->deferred))) {
1640 dev_kfree_skb(urb->context);
1641 kfree(urb->sg);
1642 usb_free_urb(urb);
1643 }
1644
1645 if (dev->driver_info->unbind)
1646 dev->driver_info->unbind(dev, intf);
1647
1648 usb_kill_urb(dev->interrupt);
1649 usb_free_urb(dev->interrupt);
1650 kfree(dev->padding_pkt);
1651
1652 free_netdev(net);
1653}
1654EXPORT_SYMBOL_GPL(usbnet_disconnect);
1655
1656static const struct net_device_ops usbnet_netdev_ops = {
1657 .ndo_open = usbnet_open,
1658 .ndo_stop = usbnet_stop,
1659 .ndo_start_xmit = usbnet_start_xmit,
1660 .ndo_tx_timeout = usbnet_tx_timeout,
1661 .ndo_set_rx_mode = usbnet_set_rx_mode,
1662 .ndo_change_mtu = usbnet_change_mtu,
1663 .ndo_set_mac_address = eth_mac_addr,
1664 .ndo_validate_addr = eth_validate_addr,
1665};
1666
1667/*-------------------------------------------------------------------------*/
1668
1669// precondition: never called in_interrupt
1670
1671static const struct device_type wlan_type = {
1672 .name = "wlan",
1673};
1674
1675static const struct device_type wwan_type = {
1676 .name = "wwan",
1677};
1678
1679int
1680usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1681{
1682 struct usbnet *dev;
1683 struct net_device *net;
1684 struct usb_host_interface *interface;
1685 const struct driver_info *info;
1686 struct usb_device *xdev;
1687 int status;
1688 const char *name;
1689 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1690
1691 /* usbnet already took usb runtime pm, so have to enable the feature
1692 * for usb interface, otherwise usb_autopm_get_interface may return
1693 * failure if RUNTIME_PM is enabled.
1694 */
1695 if (!driver->supports_autosuspend) {
1696 driver->supports_autosuspend = 1;
1697 pm_runtime_enable(&udev->dev);
1698 }
1699
1700 name = udev->dev.driver->name;
1701 info = (const struct driver_info *) prod->driver_info;
1702 if (!info) {
1703 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1704 return -ENODEV;
1705 }
1706 xdev = interface_to_usbdev (udev);
1707 interface = udev->cur_altsetting;
1708
1709 status = -ENOMEM;
1710
1711 // set up our own records
1712 net = alloc_etherdev(sizeof(*dev));
1713 if (!net)
1714 goto out;
1715
1716 /* netdev_printk() needs this so do it as early as possible */
1717 SET_NETDEV_DEV(net, &udev->dev);
1718
1719 dev = netdev_priv(net);
1720 dev->udev = xdev;
1721 dev->intf = udev;
1722 dev->driver_info = info;
1723 dev->driver_name = name;
1724 dev->rx_speed = SPEED_UNSET;
1725 dev->tx_speed = SPEED_UNSET;
1726
1727 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1728 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1729 init_waitqueue_head(&dev->wait);
1730 skb_queue_head_init (&dev->rxq);
1731 skb_queue_head_init (&dev->txq);
1732 skb_queue_head_init (&dev->done);
1733 skb_queue_head_init(&dev->rxq_pause);
1734 tasklet_setup(&dev->bh, usbnet_bh_tasklet);
1735 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1736 init_usb_anchor(&dev->deferred);
1737 timer_setup(&dev->delay, usbnet_bh, 0);
1738 mutex_init (&dev->phy_mutex);
1739 mutex_init(&dev->interrupt_mutex);
1740 dev->interrupt_count = 0;
1741
1742 dev->net = net;
1743 strscpy(net->name, "usb%d", sizeof(net->name));
1744
1745 /* rx and tx sides can use different message sizes;
1746 * bind() should set rx_urb_size in that case.
1747 */
1748 dev->hard_mtu = net->mtu + net->hard_header_len;
1749 net->min_mtu = 0;
1750 net->max_mtu = ETH_MAX_MTU;
1751 net->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1752
1753 net->netdev_ops = &usbnet_netdev_ops;
1754 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1755 net->ethtool_ops = &usbnet_ethtool_ops;
1756 net->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1757
1758 // allow device-specific bind/init procedures
1759 // NOTE net->name still not usable ...
1760 if (info->bind) {
1761 status = info->bind (dev, udev);
1762 if (status < 0)
1763 goto out1;
1764
1765 // heuristic: "usb%d" for links we know are two-host,
1766 // else "eth%d" when there's reasonable doubt. userspace
1767 // can rename the link if it knows better.
1768 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1769 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1770 /* somebody touched it*/
1771 !is_zero_ether_addr(net->dev_addr)))
1772 strscpy(net->name, "eth%d", sizeof(net->name));
1773 /* WLAN devices should always be named "wlan%d" */
1774 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1775 strscpy(net->name, "wlan%d", sizeof(net->name));
1776 /* WWAN devices should always be named "wwan%d" */
1777 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1778 strscpy(net->name, "wwan%d", sizeof(net->name));
1779
1780 /* devices that cannot do ARP */
1781 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1782 net->flags |= IFF_NOARP;
1783
1784 /* maybe the remote can't receive an Ethernet MTU */
1785 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1786 net->mtu = dev->hard_mtu - net->hard_header_len;
1787 } else if (!info->in || !info->out)
1788 status = usbnet_get_endpoints (dev, udev);
1789 else {
1790 u8 ep_addrs[3] = {
1791 info->in + USB_DIR_IN, info->out + USB_DIR_OUT, 0
1792 };
1793
1794 dev->in = usb_rcvbulkpipe (xdev, info->in);
1795 dev->out = usb_sndbulkpipe (xdev, info->out);
1796 if (!(info->flags & FLAG_NO_SETINT))
1797 status = usb_set_interface (xdev,
1798 interface->desc.bInterfaceNumber,
1799 interface->desc.bAlternateSetting);
1800 else
1801 status = 0;
1802
1803 if (status == 0 && !usb_check_bulk_endpoints(udev, ep_addrs))
1804 status = -EINVAL;
1805 }
1806 if (status >= 0 && dev->status)
1807 status = init_status (dev, udev);
1808 if (status < 0)
1809 goto out3;
1810
1811 if (!dev->rx_urb_size)
1812 dev->rx_urb_size = dev->hard_mtu;
1813 dev->maxpacket = usb_maxpacket(dev->udev, dev->out);
1814 if (dev->maxpacket == 0) {
1815 /* that is a broken device */
1816 status = -ENODEV;
1817 goto out4;
1818 }
1819
1820 /* this flags the device for user space */
1821 if (!is_valid_ether_addr(net->dev_addr))
1822 eth_hw_addr_random(net);
1823
1824 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1825 SET_NETDEV_DEVTYPE(net, &wlan_type);
1826 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1827 SET_NETDEV_DEVTYPE(net, &wwan_type);
1828
1829 /* initialize max rx_qlen and tx_qlen */
1830 usbnet_update_max_qlen(dev);
1831
1832 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1833 !(info->flags & FLAG_MULTI_PACKET)) {
1834 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1835 if (!dev->padding_pkt) {
1836 status = -ENOMEM;
1837 goto out4;
1838 }
1839 }
1840
1841 status = register_netdev (net);
1842 if (status)
1843 goto out5;
1844 netif_info(dev, probe, dev->net,
1845 "register '%s' at usb-%s-%s, %s, %pM\n",
1846 udev->dev.driver->name,
1847 xdev->bus->bus_name, xdev->devpath,
1848 dev->driver_info->description,
1849 net->dev_addr);
1850
1851 // ok, it's ready to go.
1852 usb_set_intfdata (udev, dev);
1853
1854 netif_device_attach (net);
1855
1856 if (dev->driver_info->flags & FLAG_LINK_INTR)
1857 usbnet_link_change(dev, 0, 0);
1858
1859 return 0;
1860
1861out5:
1862 kfree(dev->padding_pkt);
1863out4:
1864 usb_free_urb(dev->interrupt);
1865out3:
1866 if (info->unbind)
1867 info->unbind (dev, udev);
1868out1:
1869 /* subdrivers must undo all they did in bind() if they
1870 * fail it, but we may fail later and a deferred kevent
1871 * may trigger an error resubmitting itself and, worse,
1872 * schedule a timer. So we kill it all just in case.
1873 */
1874 usbnet_mark_going_away(dev);
1875 cancel_work_sync(&dev->kevent);
1876 del_timer_sync(&dev->delay);
1877 free_netdev(net);
1878out:
1879 return status;
1880}
1881EXPORT_SYMBOL_GPL(usbnet_probe);
1882
1883/*-------------------------------------------------------------------------*/
1884
1885/*
1886 * suspend the whole driver as soon as the first interface is suspended
1887 * resume only when the last interface is resumed
1888 */
1889
1890int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1891{
1892 struct usbnet *dev = usb_get_intfdata(intf);
1893
1894 if (!dev->suspend_count++) {
1895 spin_lock_irq(&dev->txq.lock);
1896 /* don't autosuspend while transmitting */
1897 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1898 dev->suspend_count--;
1899 spin_unlock_irq(&dev->txq.lock);
1900 return -EBUSY;
1901 } else {
1902 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1903 spin_unlock_irq(&dev->txq.lock);
1904 }
1905 /*
1906 * accelerate emptying of the rx and queues, to avoid
1907 * having everything error out.
1908 */
1909 netif_device_detach (dev->net);
1910 usbnet_terminate_urbs(dev);
1911 __usbnet_status_stop_force(dev);
1912
1913 /*
1914 * reattach so runtime management can use and
1915 * wake the device
1916 */
1917 netif_device_attach (dev->net);
1918 }
1919 return 0;
1920}
1921EXPORT_SYMBOL_GPL(usbnet_suspend);
1922
1923int usbnet_resume (struct usb_interface *intf)
1924{
1925 struct usbnet *dev = usb_get_intfdata(intf);
1926 struct sk_buff *skb;
1927 struct urb *res;
1928 int retval;
1929
1930 if (!--dev->suspend_count) {
1931 /* resume interrupt URB if it was previously submitted */
1932 __usbnet_status_start_force(dev, GFP_NOIO);
1933
1934 spin_lock_irq(&dev->txq.lock);
1935 while ((res = usb_get_from_anchor(&dev->deferred))) {
1936
1937 skb = (struct sk_buff *)res->context;
1938 retval = usb_submit_urb(res, GFP_ATOMIC);
1939 if (retval < 0) {
1940 dev_kfree_skb_any(skb);
1941 kfree(res->sg);
1942 usb_free_urb(res);
1943 usb_autopm_put_interface_async(dev->intf);
1944 } else {
1945 netif_trans_update(dev->net);
1946 __skb_queue_tail(&dev->txq, skb);
1947 }
1948 }
1949
1950 smp_mb();
1951 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1952 spin_unlock_irq(&dev->txq.lock);
1953
1954 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1955 /* handle remote wakeup ASAP
1956 * we cannot race against stop
1957 */
1958 if (netif_device_present(dev->net) &&
1959 !timer_pending(&dev->delay) &&
1960 !test_bit(EVENT_RX_HALT, &dev->flags))
1961 rx_alloc_submit(dev, GFP_NOIO);
1962
1963 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1964 netif_tx_wake_all_queues(dev->net);
1965 tasklet_schedule (&dev->bh);
1966 }
1967 }
1968
1969 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1970 usb_autopm_get_interface_no_resume(intf);
1971
1972 return 0;
1973}
1974EXPORT_SYMBOL_GPL(usbnet_resume);
1975
1976/*
1977 * Either a subdriver implements manage_power, then it is assumed to always
1978 * be ready to be suspended or it reports the readiness to be suspended
1979 * explicitly
1980 */
1981void usbnet_device_suggests_idle(struct usbnet *dev)
1982{
1983 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1984 dev->intf->needs_remote_wakeup = 1;
1985 usb_autopm_put_interface_async(dev->intf);
1986 }
1987}
1988EXPORT_SYMBOL(usbnet_device_suggests_idle);
1989
1990/*
1991 * For devices that can do without special commands
1992 */
1993int usbnet_manage_power(struct usbnet *dev, int on)
1994{
1995 dev->intf->needs_remote_wakeup = on;
1996 return 0;
1997}
1998EXPORT_SYMBOL(usbnet_manage_power);
1999
2000void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
2001{
2002 /* update link after link is reseted */
2003 if (link && !need_reset)
2004 netif_carrier_on(dev->net);
2005 else
2006 netif_carrier_off(dev->net);
2007
2008 if (need_reset && link)
2009 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
2010 else
2011 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
2012}
2013EXPORT_SYMBOL(usbnet_link_change);
2014
2015/*-------------------------------------------------------------------------*/
2016static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2017 u16 value, u16 index, void *data, u16 size)
2018{
2019 void *buf = NULL;
2020 int err = -ENOMEM;
2021
2022 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
2023 " value=0x%04x index=0x%04x size=%d\n",
2024 cmd, reqtype, value, index, size);
2025
2026 if (size) {
2027 buf = kmalloc(size, GFP_NOIO);
2028 if (!buf)
2029 goto out;
2030 }
2031
2032 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
2033 cmd, reqtype, value, index, buf, size,
2034 USB_CTRL_GET_TIMEOUT);
2035 if (err > 0 && err <= size) {
2036 if (data)
2037 memcpy(data, buf, err);
2038 else
2039 netdev_dbg(dev->net,
2040 "Huh? Data requested but thrown away.\n");
2041 }
2042 kfree(buf);
2043out:
2044 return err;
2045}
2046
2047static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2048 u16 value, u16 index, const void *data,
2049 u16 size)
2050{
2051 void *buf = NULL;
2052 int err = -ENOMEM;
2053
2054 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2055 " value=0x%04x index=0x%04x size=%d\n",
2056 cmd, reqtype, value, index, size);
2057
2058 if (data) {
2059 buf = kmemdup(data, size, GFP_NOIO);
2060 if (!buf)
2061 goto out;
2062 } else {
2063 if (size) {
2064 WARN_ON_ONCE(1);
2065 err = -EINVAL;
2066 goto out;
2067 }
2068 }
2069
2070 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2071 cmd, reqtype, value, index, buf, size,
2072 USB_CTRL_SET_TIMEOUT);
2073 kfree(buf);
2074
2075out:
2076 return err;
2077}
2078
2079/*
2080 * The function can't be called inside suspend/resume callback,
2081 * otherwise deadlock will be caused.
2082 */
2083int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2084 u16 value, u16 index, void *data, u16 size)
2085{
2086 int ret;
2087
2088 if (usb_autopm_get_interface(dev->intf) < 0)
2089 return -ENODEV;
2090 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2091 data, size);
2092 usb_autopm_put_interface(dev->intf);
2093 return ret;
2094}
2095EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2096
2097/*
2098 * The function can't be called inside suspend/resume callback,
2099 * otherwise deadlock will be caused.
2100 */
2101int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2102 u16 value, u16 index, const void *data, u16 size)
2103{
2104 int ret;
2105
2106 if (usb_autopm_get_interface(dev->intf) < 0)
2107 return -ENODEV;
2108 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2109 data, size);
2110 usb_autopm_put_interface(dev->intf);
2111 return ret;
2112}
2113EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2114
2115/*
2116 * The function can be called inside suspend/resume callback safely
2117 * and should only be called by suspend/resume callback generally.
2118 */
2119int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2120 u16 value, u16 index, void *data, u16 size)
2121{
2122 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2123 data, size);
2124}
2125EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2126
2127/*
2128 * The function can be called inside suspend/resume callback safely
2129 * and should only be called by suspend/resume callback generally.
2130 */
2131int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2132 u16 value, u16 index, const void *data,
2133 u16 size)
2134{
2135 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2136 data, size);
2137}
2138EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2139
2140static void usbnet_async_cmd_cb(struct urb *urb)
2141{
2142 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2143 int status = urb->status;
2144
2145 if (status < 0)
2146 dev_dbg(&urb->dev->dev, "%s failed with %d",
2147 __func__, status);
2148
2149 kfree(req);
2150 usb_free_urb(urb);
2151}
2152
2153/*
2154 * The caller must make sure that device can't be put into suspend
2155 * state until the control URB completes.
2156 */
2157int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2158 u16 value, u16 index, const void *data, u16 size)
2159{
2160 struct usb_ctrlrequest *req;
2161 struct urb *urb;
2162 int err = -ENOMEM;
2163 void *buf = NULL;
2164
2165 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2166 " value=0x%04x index=0x%04x size=%d\n",
2167 cmd, reqtype, value, index, size);
2168
2169 urb = usb_alloc_urb(0, GFP_ATOMIC);
2170 if (!urb)
2171 goto fail;
2172
2173 if (data) {
2174 buf = kmemdup(data, size, GFP_ATOMIC);
2175 if (!buf) {
2176 netdev_err(dev->net, "Error allocating buffer"
2177 " in %s!\n", __func__);
2178 goto fail_free_urb;
2179 }
2180 }
2181
2182 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2183 if (!req)
2184 goto fail_free_buf;
2185
2186 req->bRequestType = reqtype;
2187 req->bRequest = cmd;
2188 req->wValue = cpu_to_le16(value);
2189 req->wIndex = cpu_to_le16(index);
2190 req->wLength = cpu_to_le16(size);
2191
2192 usb_fill_control_urb(urb, dev->udev,
2193 usb_sndctrlpipe(dev->udev, 0),
2194 (void *)req, buf, size,
2195 usbnet_async_cmd_cb, req);
2196 urb->transfer_flags |= URB_FREE_BUFFER;
2197
2198 err = usb_submit_urb(urb, GFP_ATOMIC);
2199 if (err < 0) {
2200 netdev_err(dev->net, "Error submitting the control"
2201 " message: status=%d\n", err);
2202 goto fail_free_all;
2203 }
2204 return 0;
2205
2206fail_free_all:
2207 kfree(req);
2208fail_free_buf:
2209 kfree(buf);
2210 /*
2211 * avoid a double free
2212 * needed because the flag can be set only
2213 * after filling the URB
2214 */
2215 urb->transfer_flags = 0;
2216fail_free_urb:
2217 usb_free_urb(urb);
2218fail:
2219 return err;
2220
2221}
2222EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2223/*-------------------------------------------------------------------------*/
2224
2225static int __init usbnet_init(void)
2226{
2227 /* Compiler should optimize this out. */
2228 BUILD_BUG_ON(
2229 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));
2230
2231 return 0;
2232}
2233module_init(usbnet_init);
2234
2235static void __exit usbnet_exit(void)
2236{
2237}
2238module_exit(usbnet_exit);
2239
2240MODULE_AUTHOR("David Brownell");
2241MODULE_DESCRIPTION("USB network driver framework");
2242MODULE_LICENSE("GPL");