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[mirror_ubuntu-bionic-kernel.git] / drivers / net / usb / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
24 *
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
31
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/slab.h>
46 #include <linux/kernel.h>
47 #include <linux/pm_runtime.h>
48
49 #define DRIVER_VERSION "22-Aug-2005"
50
51
52 /*-------------------------------------------------------------------------*/
53
54 /*
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
60 *
61 * The goal is to let the USB host controller be busy for 5msec or
62 * more before an irq is required, under load. Jumbograms change
63 * the equation.
64 */
65 #define MAX_QUEUE_MEMORY (60 * 1518)
66 #define RX_QLEN(dev) ((dev)->rx_qlen)
67 #define TX_QLEN(dev) ((dev)->tx_qlen)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
73 * us (it polls at HZ/4 usually) before we report too many false errors.
74 */
75 #define THROTTLE_JIFFIES (HZ/8)
76
77 // between wakeups
78 #define UNLINK_TIMEOUT_MS 3
79
80 /*-------------------------------------------------------------------------*/
81
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
84
85 /* use ethtool to change the level for any given device */
86 static int msg_level = -1;
87 module_param (msg_level, int, 0);
88 MODULE_PARM_DESC (msg_level, "Override default message level");
89
90 /*-------------------------------------------------------------------------*/
91
92 /* handles CDC Ethernet and many other network "bulk data" interfaces */
93 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
94 {
95 int tmp;
96 struct usb_host_interface *alt = NULL;
97 struct usb_host_endpoint *in = NULL, *out = NULL;
98 struct usb_host_endpoint *status = NULL;
99
100 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
101 unsigned ep;
102
103 in = out = status = NULL;
104 alt = intf->altsetting + tmp;
105
106 /* take the first altsetting with in-bulk + out-bulk;
107 * remember any status endpoint, just in case;
108 * ignore other endpoints and altsettings.
109 */
110 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
111 struct usb_host_endpoint *e;
112 int intr = 0;
113
114 e = alt->endpoint + ep;
115 switch (e->desc.bmAttributes) {
116 case USB_ENDPOINT_XFER_INT:
117 if (!usb_endpoint_dir_in(&e->desc))
118 continue;
119 intr = 1;
120 /* FALLTHROUGH */
121 case USB_ENDPOINT_XFER_BULK:
122 break;
123 default:
124 continue;
125 }
126 if (usb_endpoint_dir_in(&e->desc)) {
127 if (!intr && !in)
128 in = e;
129 else if (intr && !status)
130 status = e;
131 } else {
132 if (!out)
133 out = e;
134 }
135 }
136 if (in && out)
137 break;
138 }
139 if (!alt || !in || !out)
140 return -EINVAL;
141
142 if (alt->desc.bAlternateSetting != 0 ||
143 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
144 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
145 alt->desc.bAlternateSetting);
146 if (tmp < 0)
147 return tmp;
148 }
149
150 dev->in = usb_rcvbulkpipe (dev->udev,
151 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
152 dev->out = usb_sndbulkpipe (dev->udev,
153 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->status = status;
155 return 0;
156 }
157 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
158
159 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
160 {
161 int tmp = -1, ret;
162 unsigned char buf [13];
163
164 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
165 if (ret == 12)
166 tmp = hex2bin(dev->net->dev_addr, buf, 6);
167 if (tmp < 0) {
168 dev_dbg(&dev->udev->dev,
169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
170 if (ret >= 0)
171 ret = -EINVAL;
172 return ret;
173 }
174 return 0;
175 }
176 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
177
178 static void intr_complete (struct urb *urb)
179 {
180 struct usbnet *dev = urb->context;
181 int status = urb->status;
182
183 switch (status) {
184 /* success */
185 case 0:
186 dev->driver_info->status(dev, urb);
187 break;
188
189 /* software-driven interface shutdown */
190 case -ENOENT: /* urb killed */
191 case -ESHUTDOWN: /* hardware gone */
192 netif_dbg(dev, ifdown, dev->net,
193 "intr shutdown, code %d\n", status);
194 return;
195
196 /* NOTE: not throttling like RX/TX, since this endpoint
197 * already polls infrequently
198 */
199 default:
200 netdev_dbg(dev->net, "intr status %d\n", status);
201 break;
202 }
203
204 status = usb_submit_urb (urb, GFP_ATOMIC);
205 if (status != 0)
206 netif_err(dev, timer, dev->net,
207 "intr resubmit --> %d\n", status);
208 }
209
210 static int init_status (struct usbnet *dev, struct usb_interface *intf)
211 {
212 char *buf = NULL;
213 unsigned pipe = 0;
214 unsigned maxp;
215 unsigned period;
216
217 if (!dev->driver_info->status)
218 return 0;
219
220 pipe = usb_rcvintpipe (dev->udev,
221 dev->status->desc.bEndpointAddress
222 & USB_ENDPOINT_NUMBER_MASK);
223 maxp = usb_maxpacket (dev->udev, pipe, 0);
224
225 /* avoid 1 msec chatter: min 8 msec poll rate */
226 period = max ((int) dev->status->desc.bInterval,
227 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
228
229 buf = kmalloc (maxp, GFP_KERNEL);
230 if (buf) {
231 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
232 if (!dev->interrupt) {
233 kfree (buf);
234 return -ENOMEM;
235 } else {
236 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
237 buf, maxp, intr_complete, dev, period);
238 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
239 dev_dbg(&intf->dev,
240 "status ep%din, %d bytes period %d\n",
241 usb_pipeendpoint(pipe), maxp, period);
242 }
243 }
244 return 0;
245 }
246
247 /* Submit the interrupt URB if not previously submitted, increasing refcount */
248 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
249 {
250 int ret = 0;
251
252 WARN_ON_ONCE(dev->interrupt == NULL);
253 if (dev->interrupt) {
254 mutex_lock(&dev->interrupt_mutex);
255
256 if (++dev->interrupt_count == 1)
257 ret = usb_submit_urb(dev->interrupt, mem_flags);
258
259 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
260 dev->interrupt_count);
261 mutex_unlock(&dev->interrupt_mutex);
262 }
263 return ret;
264 }
265 EXPORT_SYMBOL_GPL(usbnet_status_start);
266
267 /* For resume; submit interrupt URB if previously submitted */
268 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
269 {
270 int ret = 0;
271
272 mutex_lock(&dev->interrupt_mutex);
273 if (dev->interrupt_count) {
274 ret = usb_submit_urb(dev->interrupt, mem_flags);
275 dev_dbg(&dev->udev->dev,
276 "submitted interrupt URB for resume\n");
277 }
278 mutex_unlock(&dev->interrupt_mutex);
279 return ret;
280 }
281
282 /* Kill the interrupt URB if all submitters want it killed */
283 void usbnet_status_stop(struct usbnet *dev)
284 {
285 if (dev->interrupt) {
286 mutex_lock(&dev->interrupt_mutex);
287 WARN_ON(dev->interrupt_count == 0);
288
289 if (dev->interrupt_count && --dev->interrupt_count == 0)
290 usb_kill_urb(dev->interrupt);
291
292 dev_dbg(&dev->udev->dev,
293 "decremented interrupt URB count to %d\n",
294 dev->interrupt_count);
295 mutex_unlock(&dev->interrupt_mutex);
296 }
297 }
298 EXPORT_SYMBOL_GPL(usbnet_status_stop);
299
300 /* For suspend; always kill interrupt URB */
301 static void __usbnet_status_stop_force(struct usbnet *dev)
302 {
303 if (dev->interrupt) {
304 mutex_lock(&dev->interrupt_mutex);
305 usb_kill_urb(dev->interrupt);
306 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
307 mutex_unlock(&dev->interrupt_mutex);
308 }
309 }
310
311 /* Passes this packet up the stack, updating its accounting.
312 * Some link protocols batch packets, so their rx_fixup paths
313 * can return clones as well as just modify the original skb.
314 */
315 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
316 {
317 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
318 int status;
319
320 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
321 skb_queue_tail(&dev->rxq_pause, skb);
322 return;
323 }
324
325 /* only update if unset to allow minidriver rx_fixup override */
326 if (skb->protocol == 0)
327 skb->protocol = eth_type_trans (skb, dev->net);
328
329 u64_stats_update_begin(&stats64->syncp);
330 stats64->rx_packets++;
331 stats64->rx_bytes += skb->len;
332 u64_stats_update_end(&stats64->syncp);
333
334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
335 skb->len + sizeof (struct ethhdr), skb->protocol);
336 memset (skb->cb, 0, sizeof (struct skb_data));
337
338 if (skb_defer_rx_timestamp(skb))
339 return;
340
341 status = netif_rx (skb);
342 if (status != NET_RX_SUCCESS)
343 netif_dbg(dev, rx_err, dev->net,
344 "netif_rx status %d\n", status);
345 }
346 EXPORT_SYMBOL_GPL(usbnet_skb_return);
347
348 /* must be called if hard_mtu or rx_urb_size changed */
349 void usbnet_update_max_qlen(struct usbnet *dev)
350 {
351 enum usb_device_speed speed = dev->udev->speed;
352
353 switch (speed) {
354 case USB_SPEED_HIGH:
355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
357 break;
358 case USB_SPEED_SUPER:
359 case USB_SPEED_SUPER_PLUS:
360 /*
361 * Not take default 5ms qlen for super speed HC to
362 * save memory, and iperf tests show 2.5ms qlen can
363 * work well
364 */
365 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
366 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
367 break;
368 default:
369 dev->rx_qlen = dev->tx_qlen = 4;
370 }
371 }
372 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
373
374 \f
375 /*-------------------------------------------------------------------------
376 *
377 * Network Device Driver (peer link to "Host Device", from USB host)
378 *
379 *-------------------------------------------------------------------------*/
380
381 int usbnet_change_mtu (struct net_device *net, int new_mtu)
382 {
383 struct usbnet *dev = netdev_priv(net);
384 int ll_mtu = new_mtu + net->hard_header_len;
385 int old_hard_mtu = dev->hard_mtu;
386 int old_rx_urb_size = dev->rx_urb_size;
387
388 // no second zero-length packet read wanted after mtu-sized packets
389 if ((ll_mtu % dev->maxpacket) == 0)
390 return -EDOM;
391 net->mtu = new_mtu;
392
393 dev->hard_mtu = net->mtu + net->hard_header_len;
394 if (dev->rx_urb_size == old_hard_mtu) {
395 dev->rx_urb_size = dev->hard_mtu;
396 if (dev->rx_urb_size > old_rx_urb_size) {
397 usbnet_pause_rx(dev);
398 usbnet_unlink_rx_urbs(dev);
399 usbnet_resume_rx(dev);
400 }
401 }
402
403 /* max qlen depend on hard_mtu and rx_urb_size */
404 usbnet_update_max_qlen(dev);
405
406 return 0;
407 }
408 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
409
410 /* The caller must hold list->lock */
411 static void __usbnet_queue_skb(struct sk_buff_head *list,
412 struct sk_buff *newsk, enum skb_state state)
413 {
414 struct skb_data *entry = (struct skb_data *) newsk->cb;
415
416 __skb_queue_tail(list, newsk);
417 entry->state = state;
418 }
419
420 /*-------------------------------------------------------------------------*/
421
422 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
423 * completion callbacks. 2.5 should have fixed those bugs...
424 */
425
426 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
427 struct sk_buff_head *list, enum skb_state state)
428 {
429 unsigned long flags;
430 enum skb_state old_state;
431 struct skb_data *entry = (struct skb_data *) skb->cb;
432
433 spin_lock_irqsave(&list->lock, flags);
434 old_state = entry->state;
435 entry->state = state;
436 __skb_unlink(skb, list);
437
438 /* defer_bh() is never called with list == &dev->done.
439 * spin_lock_nested() tells lockdep that it is OK to take
440 * dev->done.lock here with list->lock held.
441 */
442 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
443
444 __skb_queue_tail(&dev->done, skb);
445 if (dev->done.qlen == 1)
446 tasklet_schedule(&dev->bh);
447 spin_unlock(&dev->done.lock);
448 spin_unlock_irqrestore(&list->lock, flags);
449 return old_state;
450 }
451
452 /* some work can't be done in tasklets, so we use keventd
453 *
454 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
455 * but tasklet_schedule() doesn't. hope the failure is rare.
456 */
457 void usbnet_defer_kevent (struct usbnet *dev, int work)
458 {
459 set_bit (work, &dev->flags);
460 if (!schedule_work (&dev->kevent))
461 netdev_dbg(dev->net, "kevent %d may have been dropped\n", work);
462 else
463 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
464 }
465 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
466
467 /*-------------------------------------------------------------------------*/
468
469 static void rx_complete (struct urb *urb);
470
471 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
472 {
473 struct sk_buff *skb;
474 struct skb_data *entry;
475 int retval = 0;
476 unsigned long lockflags;
477 size_t size = dev->rx_urb_size;
478
479 /* prevent rx skb allocation when error ratio is high */
480 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
481 usb_free_urb(urb);
482 return -ENOLINK;
483 }
484
485 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
486 skb = __netdev_alloc_skb(dev->net, size, flags);
487 else
488 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
489 if (!skb) {
490 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
491 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
492 usb_free_urb (urb);
493 return -ENOMEM;
494 }
495
496 entry = (struct skb_data *) skb->cb;
497 entry->urb = urb;
498 entry->dev = dev;
499 entry->length = 0;
500
501 usb_fill_bulk_urb (urb, dev->udev, dev->in,
502 skb->data, size, rx_complete, skb);
503
504 spin_lock_irqsave (&dev->rxq.lock, lockflags);
505
506 if (netif_running (dev->net) &&
507 netif_device_present (dev->net) &&
508 !test_bit (EVENT_RX_HALT, &dev->flags) &&
509 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
510 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
511 case -EPIPE:
512 usbnet_defer_kevent (dev, EVENT_RX_HALT);
513 break;
514 case -ENOMEM:
515 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
516 break;
517 case -ENODEV:
518 netif_dbg(dev, ifdown, dev->net, "device gone\n");
519 netif_device_detach (dev->net);
520 break;
521 case -EHOSTUNREACH:
522 retval = -ENOLINK;
523 break;
524 default:
525 netif_dbg(dev, rx_err, dev->net,
526 "rx submit, %d\n", retval);
527 tasklet_schedule (&dev->bh);
528 break;
529 case 0:
530 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
531 }
532 } else {
533 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
534 retval = -ENOLINK;
535 }
536 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
537 if (retval) {
538 dev_kfree_skb_any (skb);
539 usb_free_urb (urb);
540 }
541 return retval;
542 }
543
544
545 /*-------------------------------------------------------------------------*/
546
547 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
548 {
549 if (dev->driver_info->rx_fixup &&
550 !dev->driver_info->rx_fixup (dev, skb)) {
551 /* With RX_ASSEMBLE, rx_fixup() must update counters */
552 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
553 dev->net->stats.rx_errors++;
554 goto done;
555 }
556 // else network stack removes extra byte if we forced a short packet
557
558 /* all data was already cloned from skb inside the driver */
559 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
560 goto done;
561
562 if (skb->len < ETH_HLEN) {
563 dev->net->stats.rx_errors++;
564 dev->net->stats.rx_length_errors++;
565 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
566 } else {
567 usbnet_skb_return(dev, skb);
568 return;
569 }
570
571 done:
572 skb_queue_tail(&dev->done, skb);
573 }
574
575 /*-------------------------------------------------------------------------*/
576
577 static void rx_complete (struct urb *urb)
578 {
579 struct sk_buff *skb = (struct sk_buff *) urb->context;
580 struct skb_data *entry = (struct skb_data *) skb->cb;
581 struct usbnet *dev = entry->dev;
582 int urb_status = urb->status;
583 enum skb_state state;
584
585 skb_put (skb, urb->actual_length);
586 state = rx_done;
587 entry->urb = NULL;
588
589 switch (urb_status) {
590 /* success */
591 case 0:
592 break;
593
594 /* stalls need manual reset. this is rare ... except that
595 * when going through USB 2.0 TTs, unplug appears this way.
596 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
597 * storm, recovering as needed.
598 */
599 case -EPIPE:
600 dev->net->stats.rx_errors++;
601 usbnet_defer_kevent (dev, EVENT_RX_HALT);
602 // FALLTHROUGH
603
604 /* software-driven interface shutdown */
605 case -ECONNRESET: /* async unlink */
606 case -ESHUTDOWN: /* hardware gone */
607 netif_dbg(dev, ifdown, dev->net,
608 "rx shutdown, code %d\n", urb_status);
609 goto block;
610
611 /* we get controller i/o faults during hub_wq disconnect() delays.
612 * throttle down resubmits, to avoid log floods; just temporarily,
613 * so we still recover when the fault isn't a hub_wq delay.
614 */
615 case -EPROTO:
616 case -ETIME:
617 case -EILSEQ:
618 dev->net->stats.rx_errors++;
619 if (!timer_pending (&dev->delay)) {
620 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
621 netif_dbg(dev, link, dev->net,
622 "rx throttle %d\n", urb_status);
623 }
624 block:
625 state = rx_cleanup;
626 entry->urb = urb;
627 urb = NULL;
628 break;
629
630 /* data overrun ... flush fifo? */
631 case -EOVERFLOW:
632 dev->net->stats.rx_over_errors++;
633 // FALLTHROUGH
634
635 default:
636 state = rx_cleanup;
637 dev->net->stats.rx_errors++;
638 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
639 break;
640 }
641
642 /* stop rx if packet error rate is high */
643 if (++dev->pkt_cnt > 30) {
644 dev->pkt_cnt = 0;
645 dev->pkt_err = 0;
646 } else {
647 if (state == rx_cleanup)
648 dev->pkt_err++;
649 if (dev->pkt_err > 20)
650 set_bit(EVENT_RX_KILL, &dev->flags);
651 }
652
653 state = defer_bh(dev, skb, &dev->rxq, state);
654
655 if (urb) {
656 if (netif_running (dev->net) &&
657 !test_bit (EVENT_RX_HALT, &dev->flags) &&
658 state != unlink_start) {
659 rx_submit (dev, urb, GFP_ATOMIC);
660 usb_mark_last_busy(dev->udev);
661 return;
662 }
663 usb_free_urb (urb);
664 }
665 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
666 }
667
668 /*-------------------------------------------------------------------------*/
669 void usbnet_pause_rx(struct usbnet *dev)
670 {
671 set_bit(EVENT_RX_PAUSED, &dev->flags);
672
673 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
674 }
675 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
676
677 void usbnet_resume_rx(struct usbnet *dev)
678 {
679 struct sk_buff *skb;
680 int num = 0;
681
682 clear_bit(EVENT_RX_PAUSED, &dev->flags);
683
684 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
685 usbnet_skb_return(dev, skb);
686 num++;
687 }
688
689 tasklet_schedule(&dev->bh);
690
691 netif_dbg(dev, rx_status, dev->net,
692 "paused rx queue disabled, %d skbs requeued\n", num);
693 }
694 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
695
696 void usbnet_purge_paused_rxq(struct usbnet *dev)
697 {
698 skb_queue_purge(&dev->rxq_pause);
699 }
700 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
701
702 /*-------------------------------------------------------------------------*/
703
704 // unlink pending rx/tx; completion handlers do all other cleanup
705
706 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
707 {
708 unsigned long flags;
709 struct sk_buff *skb;
710 int count = 0;
711
712 spin_lock_irqsave (&q->lock, flags);
713 while (!skb_queue_empty(q)) {
714 struct skb_data *entry;
715 struct urb *urb;
716 int retval;
717
718 skb_queue_walk(q, skb) {
719 entry = (struct skb_data *) skb->cb;
720 if (entry->state != unlink_start)
721 goto found;
722 }
723 break;
724 found:
725 entry->state = unlink_start;
726 urb = entry->urb;
727
728 /*
729 * Get reference count of the URB to avoid it to be
730 * freed during usb_unlink_urb, which may trigger
731 * use-after-free problem inside usb_unlink_urb since
732 * usb_unlink_urb is always racing with .complete
733 * handler(include defer_bh).
734 */
735 usb_get_urb(urb);
736 spin_unlock_irqrestore(&q->lock, flags);
737 // during some PM-driven resume scenarios,
738 // these (async) unlinks complete immediately
739 retval = usb_unlink_urb (urb);
740 if (retval != -EINPROGRESS && retval != 0)
741 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
742 else
743 count++;
744 usb_put_urb(urb);
745 spin_lock_irqsave(&q->lock, flags);
746 }
747 spin_unlock_irqrestore (&q->lock, flags);
748 return count;
749 }
750
751 // Flush all pending rx urbs
752 // minidrivers may need to do this when the MTU changes
753
754 void usbnet_unlink_rx_urbs(struct usbnet *dev)
755 {
756 if (netif_running(dev->net)) {
757 (void) unlink_urbs (dev, &dev->rxq);
758 tasklet_schedule(&dev->bh);
759 }
760 }
761 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
762
763 /*-------------------------------------------------------------------------*/
764
765 static void wait_skb_queue_empty(struct sk_buff_head *q)
766 {
767 unsigned long flags;
768
769 spin_lock_irqsave(&q->lock, flags);
770 while (!skb_queue_empty(q)) {
771 spin_unlock_irqrestore(&q->lock, flags);
772 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
773 set_current_state(TASK_UNINTERRUPTIBLE);
774 spin_lock_irqsave(&q->lock, flags);
775 }
776 spin_unlock_irqrestore(&q->lock, flags);
777 }
778
779 // precondition: never called in_interrupt
780 static void usbnet_terminate_urbs(struct usbnet *dev)
781 {
782 DECLARE_WAITQUEUE(wait, current);
783 int temp;
784
785 /* ensure there are no more active urbs */
786 add_wait_queue(&dev->wait, &wait);
787 set_current_state(TASK_UNINTERRUPTIBLE);
788 temp = unlink_urbs(dev, &dev->txq) +
789 unlink_urbs(dev, &dev->rxq);
790
791 /* maybe wait for deletions to finish. */
792 wait_skb_queue_empty(&dev->rxq);
793 wait_skb_queue_empty(&dev->txq);
794 wait_skb_queue_empty(&dev->done);
795 netif_dbg(dev, ifdown, dev->net,
796 "waited for %d urb completions\n", temp);
797 set_current_state(TASK_RUNNING);
798 remove_wait_queue(&dev->wait, &wait);
799 }
800
801 int usbnet_stop (struct net_device *net)
802 {
803 struct usbnet *dev = netdev_priv(net);
804 struct driver_info *info = dev->driver_info;
805 int retval, pm, mpn;
806
807 clear_bit(EVENT_DEV_OPEN, &dev->flags);
808 netif_stop_queue (net);
809
810 netif_info(dev, ifdown, dev->net,
811 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
812 net->stats.rx_packets, net->stats.tx_packets,
813 net->stats.rx_errors, net->stats.tx_errors);
814
815 /* to not race resume */
816 pm = usb_autopm_get_interface(dev->intf);
817 /* allow minidriver to stop correctly (wireless devices to turn off
818 * radio etc) */
819 if (info->stop) {
820 retval = info->stop(dev);
821 if (retval < 0)
822 netif_info(dev, ifdown, dev->net,
823 "stop fail (%d) usbnet usb-%s-%s, %s\n",
824 retval,
825 dev->udev->bus->bus_name, dev->udev->devpath,
826 info->description);
827 }
828
829 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
830 usbnet_terminate_urbs(dev);
831
832 usbnet_status_stop(dev);
833
834 usbnet_purge_paused_rxq(dev);
835
836 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
837
838 /* deferred work (task, timer, softirq) must also stop.
839 * can't flush_scheduled_work() until we drop rtnl (later),
840 * else workers could deadlock; so make workers a NOP.
841 */
842 dev->flags = 0;
843 del_timer_sync (&dev->delay);
844 tasklet_kill (&dev->bh);
845 if (!pm)
846 usb_autopm_put_interface(dev->intf);
847
848 if (info->manage_power && mpn)
849 info->manage_power(dev, 0);
850 else
851 usb_autopm_put_interface(dev->intf);
852
853 return 0;
854 }
855 EXPORT_SYMBOL_GPL(usbnet_stop);
856
857 /*-------------------------------------------------------------------------*/
858
859 // posts reads, and enables write queuing
860
861 // precondition: never called in_interrupt
862
863 int usbnet_open (struct net_device *net)
864 {
865 struct usbnet *dev = netdev_priv(net);
866 int retval;
867 struct driver_info *info = dev->driver_info;
868
869 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
870 netif_info(dev, ifup, dev->net,
871 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
872 retval,
873 dev->udev->bus->bus_name,
874 dev->udev->devpath,
875 info->description);
876 goto done_nopm;
877 }
878
879 // put into "known safe" state
880 if (info->reset && (retval = info->reset (dev)) < 0) {
881 netif_info(dev, ifup, dev->net,
882 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
883 retval,
884 dev->udev->bus->bus_name,
885 dev->udev->devpath,
886 info->description);
887 goto done;
888 }
889
890 /* hard_mtu or rx_urb_size may change in reset() */
891 usbnet_update_max_qlen(dev);
892
893 // insist peer be connected
894 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
895 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
896 goto done;
897 }
898
899 /* start any status interrupt transfer */
900 if (dev->interrupt) {
901 retval = usbnet_status_start(dev, GFP_KERNEL);
902 if (retval < 0) {
903 netif_err(dev, ifup, dev->net,
904 "intr submit %d\n", retval);
905 goto done;
906 }
907 }
908
909 set_bit(EVENT_DEV_OPEN, &dev->flags);
910 netif_start_queue (net);
911 netif_info(dev, ifup, dev->net,
912 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
913 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
914 dev->net->mtu,
915 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
916 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
917 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
918 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
919 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
920 "simple");
921
922 /* reset rx error state */
923 dev->pkt_cnt = 0;
924 dev->pkt_err = 0;
925 clear_bit(EVENT_RX_KILL, &dev->flags);
926
927 // delay posting reads until we're fully open
928 tasklet_schedule (&dev->bh);
929 if (info->manage_power) {
930 retval = info->manage_power(dev, 1);
931 if (retval < 0) {
932 retval = 0;
933 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
934 } else {
935 usb_autopm_put_interface(dev->intf);
936 }
937 }
938 return retval;
939 done:
940 usb_autopm_put_interface(dev->intf);
941 done_nopm:
942 return retval;
943 }
944 EXPORT_SYMBOL_GPL(usbnet_open);
945
946 /*-------------------------------------------------------------------------*/
947
948 /* ethtool methods; minidrivers may need to add some more, but
949 * they'll probably want to use this base set.
950 */
951
952 int usbnet_get_link_ksettings(struct net_device *net,
953 struct ethtool_link_ksettings *cmd)
954 {
955 struct usbnet *dev = netdev_priv(net);
956
957 if (!dev->mii.mdio_read)
958 return -EOPNOTSUPP;
959
960 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
961
962 return 0;
963 }
964 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings);
965
966 int usbnet_set_link_ksettings(struct net_device *net,
967 const struct ethtool_link_ksettings *cmd)
968 {
969 struct usbnet *dev = netdev_priv(net);
970 int retval;
971
972 if (!dev->mii.mdio_write)
973 return -EOPNOTSUPP;
974
975 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
976
977 /* link speed/duplex might have changed */
978 if (dev->driver_info->link_reset)
979 dev->driver_info->link_reset(dev);
980
981 /* hard_mtu or rx_urb_size may change in link_reset() */
982 usbnet_update_max_qlen(dev);
983
984 return retval;
985 }
986 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings);
987
988 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats)
989 {
990 struct usbnet *dev = netdev_priv(net);
991 unsigned int start;
992 int cpu;
993
994 netdev_stats_to_stats64(stats, &net->stats);
995
996 for_each_possible_cpu(cpu) {
997 struct pcpu_sw_netstats *stats64;
998 u64 rx_packets, rx_bytes;
999 u64 tx_packets, tx_bytes;
1000
1001 stats64 = per_cpu_ptr(dev->stats64, cpu);
1002
1003 do {
1004 start = u64_stats_fetch_begin_irq(&stats64->syncp);
1005 rx_packets = stats64->rx_packets;
1006 rx_bytes = stats64->rx_bytes;
1007 tx_packets = stats64->tx_packets;
1008 tx_bytes = stats64->tx_bytes;
1009 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
1010
1011 stats->rx_packets += rx_packets;
1012 stats->rx_bytes += rx_bytes;
1013 stats->tx_packets += tx_packets;
1014 stats->tx_bytes += tx_bytes;
1015 }
1016 }
1017 EXPORT_SYMBOL_GPL(usbnet_get_stats64);
1018
1019 u32 usbnet_get_link (struct net_device *net)
1020 {
1021 struct usbnet *dev = netdev_priv(net);
1022
1023 /* If a check_connect is defined, return its result */
1024 if (dev->driver_info->check_connect)
1025 return dev->driver_info->check_connect (dev) == 0;
1026
1027 /* if the device has mii operations, use those */
1028 if (dev->mii.mdio_read)
1029 return mii_link_ok(&dev->mii);
1030
1031 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
1032 return ethtool_op_get_link(net);
1033 }
1034 EXPORT_SYMBOL_GPL(usbnet_get_link);
1035
1036 int usbnet_nway_reset(struct net_device *net)
1037 {
1038 struct usbnet *dev = netdev_priv(net);
1039
1040 if (!dev->mii.mdio_write)
1041 return -EOPNOTSUPP;
1042
1043 return mii_nway_restart(&dev->mii);
1044 }
1045 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1046
1047 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1048 {
1049 struct usbnet *dev = netdev_priv(net);
1050
1051 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1052 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1053 strlcpy (info->fw_version, dev->driver_info->description,
1054 sizeof info->fw_version);
1055 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1056 }
1057 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1058
1059 u32 usbnet_get_msglevel (struct net_device *net)
1060 {
1061 struct usbnet *dev = netdev_priv(net);
1062
1063 return dev->msg_enable;
1064 }
1065 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1066
1067 void usbnet_set_msglevel (struct net_device *net, u32 level)
1068 {
1069 struct usbnet *dev = netdev_priv(net);
1070
1071 dev->msg_enable = level;
1072 }
1073 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1074
1075 /* drivers may override default ethtool_ops in their bind() routine */
1076 static const struct ethtool_ops usbnet_ethtool_ops = {
1077 .get_link = usbnet_get_link,
1078 .nway_reset = usbnet_nway_reset,
1079 .get_drvinfo = usbnet_get_drvinfo,
1080 .get_msglevel = usbnet_get_msglevel,
1081 .set_msglevel = usbnet_set_msglevel,
1082 .get_ts_info = ethtool_op_get_ts_info,
1083 .get_link_ksettings = usbnet_get_link_ksettings,
1084 .set_link_ksettings = usbnet_set_link_ksettings,
1085 };
1086
1087 /*-------------------------------------------------------------------------*/
1088
1089 static void __handle_link_change(struct usbnet *dev)
1090 {
1091 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1092 return;
1093
1094 if (!netif_carrier_ok(dev->net)) {
1095 /* kill URBs for reading packets to save bus bandwidth */
1096 unlink_urbs(dev, &dev->rxq);
1097
1098 /*
1099 * tx_timeout will unlink URBs for sending packets and
1100 * tx queue is stopped by netcore after link becomes off
1101 */
1102 } else {
1103 /* submitting URBs for reading packets */
1104 tasklet_schedule(&dev->bh);
1105 }
1106
1107 /* hard_mtu or rx_urb_size may change during link change */
1108 usbnet_update_max_qlen(dev);
1109
1110 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1111 }
1112
1113 static void usbnet_set_rx_mode(struct net_device *net)
1114 {
1115 struct usbnet *dev = netdev_priv(net);
1116
1117 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1118 }
1119
1120 static void __handle_set_rx_mode(struct usbnet *dev)
1121 {
1122 if (dev->driver_info->set_rx_mode)
1123 (dev->driver_info->set_rx_mode)(dev);
1124
1125 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1126 }
1127
1128 /* work that cannot be done in interrupt context uses keventd.
1129 *
1130 * NOTE: with 2.5 we could do more of this using completion callbacks,
1131 * especially now that control transfers can be queued.
1132 */
1133 static void
1134 usbnet_deferred_kevent (struct work_struct *work)
1135 {
1136 struct usbnet *dev =
1137 container_of(work, struct usbnet, kevent);
1138 int status;
1139
1140 /* usb_clear_halt() needs a thread context */
1141 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1142 unlink_urbs (dev, &dev->txq);
1143 status = usb_autopm_get_interface(dev->intf);
1144 if (status < 0)
1145 goto fail_pipe;
1146 status = usb_clear_halt (dev->udev, dev->out);
1147 usb_autopm_put_interface(dev->intf);
1148 if (status < 0 &&
1149 status != -EPIPE &&
1150 status != -ESHUTDOWN) {
1151 if (netif_msg_tx_err (dev))
1152 fail_pipe:
1153 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1154 status);
1155 } else {
1156 clear_bit (EVENT_TX_HALT, &dev->flags);
1157 if (status != -ESHUTDOWN)
1158 netif_wake_queue (dev->net);
1159 }
1160 }
1161 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1162 unlink_urbs (dev, &dev->rxq);
1163 status = usb_autopm_get_interface(dev->intf);
1164 if (status < 0)
1165 goto fail_halt;
1166 status = usb_clear_halt (dev->udev, dev->in);
1167 usb_autopm_put_interface(dev->intf);
1168 if (status < 0 &&
1169 status != -EPIPE &&
1170 status != -ESHUTDOWN) {
1171 if (netif_msg_rx_err (dev))
1172 fail_halt:
1173 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1174 status);
1175 } else {
1176 clear_bit (EVENT_RX_HALT, &dev->flags);
1177 tasklet_schedule (&dev->bh);
1178 }
1179 }
1180
1181 /* tasklet could resubmit itself forever if memory is tight */
1182 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1183 struct urb *urb = NULL;
1184 int resched = 1;
1185
1186 if (netif_running (dev->net))
1187 urb = usb_alloc_urb (0, GFP_KERNEL);
1188 else
1189 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1190 if (urb != NULL) {
1191 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1192 status = usb_autopm_get_interface(dev->intf);
1193 if (status < 0) {
1194 usb_free_urb(urb);
1195 goto fail_lowmem;
1196 }
1197 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1198 resched = 0;
1199 usb_autopm_put_interface(dev->intf);
1200 fail_lowmem:
1201 if (resched)
1202 tasklet_schedule (&dev->bh);
1203 }
1204 }
1205
1206 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1207 struct driver_info *info = dev->driver_info;
1208 int retval = 0;
1209
1210 clear_bit (EVENT_LINK_RESET, &dev->flags);
1211 status = usb_autopm_get_interface(dev->intf);
1212 if (status < 0)
1213 goto skip_reset;
1214 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1215 usb_autopm_put_interface(dev->intf);
1216 skip_reset:
1217 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1218 retval,
1219 dev->udev->bus->bus_name,
1220 dev->udev->devpath,
1221 info->description);
1222 } else {
1223 usb_autopm_put_interface(dev->intf);
1224 }
1225
1226 /* handle link change from link resetting */
1227 __handle_link_change(dev);
1228 }
1229
1230 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1231 __handle_link_change(dev);
1232
1233 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1234 __handle_set_rx_mode(dev);
1235
1236
1237 if (dev->flags)
1238 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1239 }
1240
1241 /*-------------------------------------------------------------------------*/
1242
1243 static void tx_complete (struct urb *urb)
1244 {
1245 struct sk_buff *skb = (struct sk_buff *) urb->context;
1246 struct skb_data *entry = (struct skb_data *) skb->cb;
1247 struct usbnet *dev = entry->dev;
1248
1249 if (urb->status == 0) {
1250 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
1251
1252 u64_stats_update_begin(&stats64->syncp);
1253 stats64->tx_packets += entry->packets;
1254 stats64->tx_bytes += entry->length;
1255 u64_stats_update_end(&stats64->syncp);
1256 } else {
1257 dev->net->stats.tx_errors++;
1258
1259 switch (urb->status) {
1260 case -EPIPE:
1261 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1262 break;
1263
1264 /* software-driven interface shutdown */
1265 case -ECONNRESET: // async unlink
1266 case -ESHUTDOWN: // hardware gone
1267 break;
1268
1269 /* like rx, tx gets controller i/o faults during hub_wq
1270 * delays and so it uses the same throttling mechanism.
1271 */
1272 case -EPROTO:
1273 case -ETIME:
1274 case -EILSEQ:
1275 usb_mark_last_busy(dev->udev);
1276 if (!timer_pending (&dev->delay)) {
1277 mod_timer (&dev->delay,
1278 jiffies + THROTTLE_JIFFIES);
1279 netif_dbg(dev, link, dev->net,
1280 "tx throttle %d\n", urb->status);
1281 }
1282 netif_stop_queue (dev->net);
1283 break;
1284 default:
1285 netif_dbg(dev, tx_err, dev->net,
1286 "tx err %d\n", entry->urb->status);
1287 break;
1288 }
1289 }
1290
1291 usb_autopm_put_interface_async(dev->intf);
1292 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1293 }
1294
1295 /*-------------------------------------------------------------------------*/
1296
1297 void usbnet_tx_timeout (struct net_device *net)
1298 {
1299 struct usbnet *dev = netdev_priv(net);
1300
1301 unlink_urbs (dev, &dev->txq);
1302 tasklet_schedule (&dev->bh);
1303 /* this needs to be handled individually because the generic layer
1304 * doesn't know what is sufficient and could not restore private
1305 * information if a remedy of an unconditional reset were used.
1306 */
1307 if (dev->driver_info->recover)
1308 (dev->driver_info->recover)(dev);
1309 }
1310 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1311
1312 /*-------------------------------------------------------------------------*/
1313
1314 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1315 {
1316 unsigned num_sgs, total_len = 0;
1317 int i, s = 0;
1318
1319 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1320 if (num_sgs == 1)
1321 return 0;
1322
1323 /* reserve one for zero packet */
1324 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1325 GFP_ATOMIC);
1326 if (!urb->sg)
1327 return -ENOMEM;
1328
1329 urb->num_sgs = num_sgs;
1330 sg_init_table(urb->sg, urb->num_sgs + 1);
1331
1332 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1333 total_len += skb_headlen(skb);
1334
1335 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1336 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1337
1338 total_len += skb_frag_size(f);
1339 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1340 f->page_offset);
1341 }
1342 urb->transfer_buffer_length = total_len;
1343
1344 return 1;
1345 }
1346
1347 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1348 struct net_device *net)
1349 {
1350 struct usbnet *dev = netdev_priv(net);
1351 unsigned int length;
1352 struct urb *urb = NULL;
1353 struct skb_data *entry;
1354 struct driver_info *info = dev->driver_info;
1355 unsigned long flags;
1356 int retval;
1357
1358 if (skb)
1359 skb_tx_timestamp(skb);
1360
1361 // some devices want funky USB-level framing, for
1362 // win32 driver (usually) and/or hardware quirks
1363 if (info->tx_fixup) {
1364 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1365 if (!skb) {
1366 /* packet collected; minidriver waiting for more */
1367 if (info->flags & FLAG_MULTI_PACKET)
1368 goto not_drop;
1369 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1370 goto drop;
1371 }
1372 }
1373
1374 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1375 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1376 goto drop;
1377 }
1378
1379 entry = (struct skb_data *) skb->cb;
1380 entry->urb = urb;
1381 entry->dev = dev;
1382
1383 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1384 skb->data, skb->len, tx_complete, skb);
1385 if (dev->can_dma_sg) {
1386 if (build_dma_sg(skb, urb) < 0)
1387 goto drop;
1388 }
1389 length = urb->transfer_buffer_length;
1390
1391 /* don't assume the hardware handles USB_ZERO_PACKET
1392 * NOTE: strictly conforming cdc-ether devices should expect
1393 * the ZLP here, but ignore the one-byte packet.
1394 * NOTE2: CDC NCM specification is different from CDC ECM when
1395 * handling ZLP/short packets, so cdc_ncm driver will make short
1396 * packet itself if needed.
1397 */
1398 if (length % dev->maxpacket == 0) {
1399 if (!(info->flags & FLAG_SEND_ZLP)) {
1400 if (!(info->flags & FLAG_MULTI_PACKET)) {
1401 length++;
1402 if (skb_tailroom(skb) && !urb->num_sgs) {
1403 skb->data[skb->len] = 0;
1404 __skb_put(skb, 1);
1405 } else if (urb->num_sgs)
1406 sg_set_buf(&urb->sg[urb->num_sgs++],
1407 dev->padding_pkt, 1);
1408 }
1409 } else
1410 urb->transfer_flags |= URB_ZERO_PACKET;
1411 }
1412 urb->transfer_buffer_length = length;
1413
1414 if (info->flags & FLAG_MULTI_PACKET) {
1415 /* Driver has set number of packets and a length delta.
1416 * Calculate the complete length and ensure that it's
1417 * positive.
1418 */
1419 entry->length += length;
1420 if (WARN_ON_ONCE(entry->length <= 0))
1421 entry->length = length;
1422 } else {
1423 usbnet_set_skb_tx_stats(skb, 1, length);
1424 }
1425
1426 spin_lock_irqsave(&dev->txq.lock, flags);
1427 retval = usb_autopm_get_interface_async(dev->intf);
1428 if (retval < 0) {
1429 spin_unlock_irqrestore(&dev->txq.lock, flags);
1430 goto drop;
1431 }
1432
1433 #ifdef CONFIG_PM
1434 /* if this triggers the device is still a sleep */
1435 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1436 /* transmission will be done in resume */
1437 usb_anchor_urb(urb, &dev->deferred);
1438 /* no use to process more packets */
1439 netif_stop_queue(net);
1440 usb_put_urb(urb);
1441 spin_unlock_irqrestore(&dev->txq.lock, flags);
1442 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1443 goto deferred;
1444 }
1445 #endif
1446
1447 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1448 case -EPIPE:
1449 netif_stop_queue (net);
1450 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1451 usb_autopm_put_interface_async(dev->intf);
1452 break;
1453 default:
1454 usb_autopm_put_interface_async(dev->intf);
1455 netif_dbg(dev, tx_err, dev->net,
1456 "tx: submit urb err %d\n", retval);
1457 break;
1458 case 0:
1459 netif_trans_update(net);
1460 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1461 if (dev->txq.qlen >= TX_QLEN (dev))
1462 netif_stop_queue (net);
1463 }
1464 spin_unlock_irqrestore (&dev->txq.lock, flags);
1465
1466 if (retval) {
1467 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1468 drop:
1469 dev->net->stats.tx_dropped++;
1470 not_drop:
1471 if (skb)
1472 dev_kfree_skb_any (skb);
1473 if (urb) {
1474 kfree(urb->sg);
1475 usb_free_urb(urb);
1476 }
1477 } else
1478 netif_dbg(dev, tx_queued, dev->net,
1479 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1480 #ifdef CONFIG_PM
1481 deferred:
1482 #endif
1483 return NETDEV_TX_OK;
1484 }
1485 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1486
1487 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1488 {
1489 struct urb *urb;
1490 int i;
1491 int ret = 0;
1492
1493 /* don't refill the queue all at once */
1494 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1495 urb = usb_alloc_urb(0, flags);
1496 if (urb != NULL) {
1497 ret = rx_submit(dev, urb, flags);
1498 if (ret)
1499 goto err;
1500 } else {
1501 ret = -ENOMEM;
1502 goto err;
1503 }
1504 }
1505 err:
1506 return ret;
1507 }
1508
1509 /*-------------------------------------------------------------------------*/
1510
1511 // tasklet (work deferred from completions, in_irq) or timer
1512
1513 static void usbnet_bh (struct timer_list *t)
1514 {
1515 struct usbnet *dev = from_timer(dev, t, delay);
1516 struct sk_buff *skb;
1517 struct skb_data *entry;
1518
1519 while ((skb = skb_dequeue (&dev->done))) {
1520 entry = (struct skb_data *) skb->cb;
1521 switch (entry->state) {
1522 case rx_done:
1523 entry->state = rx_cleanup;
1524 rx_process (dev, skb);
1525 continue;
1526 case tx_done:
1527 kfree(entry->urb->sg);
1528 case rx_cleanup:
1529 usb_free_urb (entry->urb);
1530 dev_kfree_skb (skb);
1531 continue;
1532 default:
1533 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1534 }
1535 }
1536
1537 /* restart RX again after disabling due to high error rate */
1538 clear_bit(EVENT_RX_KILL, &dev->flags);
1539
1540 /* waiting for all pending urbs to complete?
1541 * only then can we forgo submitting anew
1542 */
1543 if (waitqueue_active(&dev->wait)) {
1544 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1545 wake_up_all(&dev->wait);
1546
1547 // or are we maybe short a few urbs?
1548 } else if (netif_running (dev->net) &&
1549 netif_device_present (dev->net) &&
1550 netif_carrier_ok(dev->net) &&
1551 !timer_pending(&dev->delay) &&
1552 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1553 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1554 int temp = dev->rxq.qlen;
1555
1556 if (temp < RX_QLEN(dev)) {
1557 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1558 return;
1559 if (temp != dev->rxq.qlen)
1560 netif_dbg(dev, link, dev->net,
1561 "rxqlen %d --> %d\n",
1562 temp, dev->rxq.qlen);
1563 if (dev->rxq.qlen < RX_QLEN(dev))
1564 tasklet_schedule (&dev->bh);
1565 }
1566 if (dev->txq.qlen < TX_QLEN (dev))
1567 netif_wake_queue (dev->net);
1568 }
1569 }
1570
1571
1572 /*-------------------------------------------------------------------------
1573 *
1574 * USB Device Driver support
1575 *
1576 *-------------------------------------------------------------------------*/
1577
1578 // precondition: never called in_interrupt
1579
1580 void usbnet_disconnect (struct usb_interface *intf)
1581 {
1582 struct usbnet *dev;
1583 struct usb_device *xdev;
1584 struct net_device *net;
1585
1586 dev = usb_get_intfdata(intf);
1587 usb_set_intfdata(intf, NULL);
1588 if (!dev)
1589 return;
1590
1591 xdev = interface_to_usbdev (intf);
1592
1593 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1594 intf->dev.driver->name,
1595 xdev->bus->bus_name, xdev->devpath,
1596 dev->driver_info->description);
1597
1598 net = dev->net;
1599 unregister_netdev (net);
1600
1601 cancel_work_sync(&dev->kevent);
1602
1603 usb_scuttle_anchored_urbs(&dev->deferred);
1604
1605 if (dev->driver_info->unbind)
1606 dev->driver_info->unbind (dev, intf);
1607
1608 usb_kill_urb(dev->interrupt);
1609 usb_free_urb(dev->interrupt);
1610 kfree(dev->padding_pkt);
1611
1612 free_percpu(dev->stats64);
1613 free_netdev(net);
1614 }
1615 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1616
1617 static const struct net_device_ops usbnet_netdev_ops = {
1618 .ndo_open = usbnet_open,
1619 .ndo_stop = usbnet_stop,
1620 .ndo_start_xmit = usbnet_start_xmit,
1621 .ndo_tx_timeout = usbnet_tx_timeout,
1622 .ndo_set_rx_mode = usbnet_set_rx_mode,
1623 .ndo_change_mtu = usbnet_change_mtu,
1624 .ndo_get_stats64 = usbnet_get_stats64,
1625 .ndo_set_mac_address = eth_mac_addr,
1626 .ndo_validate_addr = eth_validate_addr,
1627 };
1628
1629 /*-------------------------------------------------------------------------*/
1630
1631 // precondition: never called in_interrupt
1632
1633 static struct device_type wlan_type = {
1634 .name = "wlan",
1635 };
1636
1637 static struct device_type wwan_type = {
1638 .name = "wwan",
1639 };
1640
1641 int
1642 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1643 {
1644 struct usbnet *dev;
1645 struct net_device *net;
1646 struct usb_host_interface *interface;
1647 struct driver_info *info;
1648 struct usb_device *xdev;
1649 int status;
1650 const char *name;
1651 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1652
1653 /* usbnet already took usb runtime pm, so have to enable the feature
1654 * for usb interface, otherwise usb_autopm_get_interface may return
1655 * failure if RUNTIME_PM is enabled.
1656 */
1657 if (!driver->supports_autosuspend) {
1658 driver->supports_autosuspend = 1;
1659 pm_runtime_enable(&udev->dev);
1660 }
1661
1662 name = udev->dev.driver->name;
1663 info = (struct driver_info *) prod->driver_info;
1664 if (!info) {
1665 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1666 return -ENODEV;
1667 }
1668 xdev = interface_to_usbdev (udev);
1669 interface = udev->cur_altsetting;
1670
1671 status = -ENOMEM;
1672
1673 // set up our own records
1674 net = alloc_etherdev(sizeof(*dev));
1675 if (!net)
1676 goto out;
1677
1678 /* netdev_printk() needs this so do it as early as possible */
1679 SET_NETDEV_DEV(net, &udev->dev);
1680
1681 dev = netdev_priv(net);
1682 dev->udev = xdev;
1683 dev->intf = udev;
1684 dev->driver_info = info;
1685 dev->driver_name = name;
1686
1687 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1688 if (!dev->stats64)
1689 goto out0;
1690
1691 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1692 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1693 init_waitqueue_head(&dev->wait);
1694 skb_queue_head_init (&dev->rxq);
1695 skb_queue_head_init (&dev->txq);
1696 skb_queue_head_init (&dev->done);
1697 skb_queue_head_init(&dev->rxq_pause);
1698 dev->bh.func = (void (*)(unsigned long))usbnet_bh;
1699 dev->bh.data = (unsigned long)&dev->delay;
1700 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1701 init_usb_anchor(&dev->deferred);
1702 timer_setup(&dev->delay, usbnet_bh, 0);
1703 mutex_init (&dev->phy_mutex);
1704 mutex_init(&dev->interrupt_mutex);
1705 dev->interrupt_count = 0;
1706
1707 dev->net = net;
1708 strcpy (net->name, "usb%d");
1709 memcpy (net->dev_addr, node_id, sizeof node_id);
1710
1711 /* rx and tx sides can use different message sizes;
1712 * bind() should set rx_urb_size in that case.
1713 */
1714 dev->hard_mtu = net->mtu + net->hard_header_len;
1715 net->min_mtu = 0;
1716 net->max_mtu = ETH_MAX_MTU;
1717
1718 net->netdev_ops = &usbnet_netdev_ops;
1719 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1720 net->ethtool_ops = &usbnet_ethtool_ops;
1721
1722 // allow device-specific bind/init procedures
1723 // NOTE net->name still not usable ...
1724 if (info->bind) {
1725 status = info->bind (dev, udev);
1726 if (status < 0)
1727 goto out1;
1728
1729 // heuristic: "usb%d" for links we know are two-host,
1730 // else "eth%d" when there's reasonable doubt. userspace
1731 // can rename the link if it knows better.
1732 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1733 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1734 (net->dev_addr [0] & 0x02) == 0))
1735 strcpy (net->name, "eth%d");
1736 /* WLAN devices should always be named "wlan%d" */
1737 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1738 strcpy(net->name, "wlan%d");
1739 /* WWAN devices should always be named "wwan%d" */
1740 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1741 strcpy(net->name, "wwan%d");
1742
1743 /* devices that cannot do ARP */
1744 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1745 net->flags |= IFF_NOARP;
1746
1747 /* maybe the remote can't receive an Ethernet MTU */
1748 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1749 net->mtu = dev->hard_mtu - net->hard_header_len;
1750 } else if (!info->in || !info->out)
1751 status = usbnet_get_endpoints (dev, udev);
1752 else {
1753 dev->in = usb_rcvbulkpipe (xdev, info->in);
1754 dev->out = usb_sndbulkpipe (xdev, info->out);
1755 if (!(info->flags & FLAG_NO_SETINT))
1756 status = usb_set_interface (xdev,
1757 interface->desc.bInterfaceNumber,
1758 interface->desc.bAlternateSetting);
1759 else
1760 status = 0;
1761
1762 }
1763 if (status >= 0 && dev->status)
1764 status = init_status (dev, udev);
1765 if (status < 0)
1766 goto out3;
1767
1768 if (!dev->rx_urb_size)
1769 dev->rx_urb_size = dev->hard_mtu;
1770 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1771
1772 /* let userspace know we have a random address */
1773 if (ether_addr_equal(net->dev_addr, node_id))
1774 net->addr_assign_type = NET_ADDR_RANDOM;
1775
1776 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1777 SET_NETDEV_DEVTYPE(net, &wlan_type);
1778 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1779 SET_NETDEV_DEVTYPE(net, &wwan_type);
1780
1781 /* initialize max rx_qlen and tx_qlen */
1782 usbnet_update_max_qlen(dev);
1783
1784 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1785 !(info->flags & FLAG_MULTI_PACKET)) {
1786 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1787 if (!dev->padding_pkt) {
1788 status = -ENOMEM;
1789 goto out4;
1790 }
1791 }
1792
1793 status = register_netdev (net);
1794 if (status)
1795 goto out5;
1796 netif_info(dev, probe, dev->net,
1797 "register '%s' at usb-%s-%s, %s, %pM\n",
1798 udev->dev.driver->name,
1799 xdev->bus->bus_name, xdev->devpath,
1800 dev->driver_info->description,
1801 net->dev_addr);
1802
1803 // ok, it's ready to go.
1804 usb_set_intfdata (udev, dev);
1805
1806 netif_device_attach (net);
1807
1808 if (dev->driver_info->flags & FLAG_LINK_INTR)
1809 usbnet_link_change(dev, 0, 0);
1810
1811 return 0;
1812
1813 out5:
1814 kfree(dev->padding_pkt);
1815 out4:
1816 usb_free_urb(dev->interrupt);
1817 out3:
1818 if (info->unbind)
1819 info->unbind (dev, udev);
1820 out1:
1821 /* subdrivers must undo all they did in bind() if they
1822 * fail it, but we may fail later and a deferred kevent
1823 * may trigger an error resubmitting itself and, worse,
1824 * schedule a timer. So we kill it all just in case.
1825 */
1826 cancel_work_sync(&dev->kevent);
1827 del_timer_sync(&dev->delay);
1828 free_percpu(dev->stats64);
1829 out0:
1830 free_netdev(net);
1831 out:
1832 return status;
1833 }
1834 EXPORT_SYMBOL_GPL(usbnet_probe);
1835
1836 /*-------------------------------------------------------------------------*/
1837
1838 /*
1839 * suspend the whole driver as soon as the first interface is suspended
1840 * resume only when the last interface is resumed
1841 */
1842
1843 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1844 {
1845 struct usbnet *dev = usb_get_intfdata(intf);
1846
1847 if (!dev->suspend_count++) {
1848 spin_lock_irq(&dev->txq.lock);
1849 /* don't autosuspend while transmitting */
1850 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1851 dev->suspend_count--;
1852 spin_unlock_irq(&dev->txq.lock);
1853 return -EBUSY;
1854 } else {
1855 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1856 spin_unlock_irq(&dev->txq.lock);
1857 }
1858 /*
1859 * accelerate emptying of the rx and queues, to avoid
1860 * having everything error out.
1861 */
1862 netif_device_detach (dev->net);
1863 usbnet_terminate_urbs(dev);
1864 __usbnet_status_stop_force(dev);
1865
1866 /*
1867 * reattach so runtime management can use and
1868 * wake the device
1869 */
1870 netif_device_attach (dev->net);
1871 }
1872 return 0;
1873 }
1874 EXPORT_SYMBOL_GPL(usbnet_suspend);
1875
1876 int usbnet_resume (struct usb_interface *intf)
1877 {
1878 struct usbnet *dev = usb_get_intfdata(intf);
1879 struct sk_buff *skb;
1880 struct urb *res;
1881 int retval;
1882
1883 if (!--dev->suspend_count) {
1884 /* resume interrupt URB if it was previously submitted */
1885 __usbnet_status_start_force(dev, GFP_NOIO);
1886
1887 spin_lock_irq(&dev->txq.lock);
1888 while ((res = usb_get_from_anchor(&dev->deferred))) {
1889
1890 skb = (struct sk_buff *)res->context;
1891 retval = usb_submit_urb(res, GFP_ATOMIC);
1892 if (retval < 0) {
1893 dev_kfree_skb_any(skb);
1894 kfree(res->sg);
1895 usb_free_urb(res);
1896 usb_autopm_put_interface_async(dev->intf);
1897 } else {
1898 netif_trans_update(dev->net);
1899 __skb_queue_tail(&dev->txq, skb);
1900 }
1901 }
1902
1903 smp_mb();
1904 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1905 spin_unlock_irq(&dev->txq.lock);
1906
1907 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1908 /* handle remote wakeup ASAP
1909 * we cannot race against stop
1910 */
1911 if (netif_device_present(dev->net) &&
1912 !timer_pending(&dev->delay) &&
1913 !test_bit(EVENT_RX_HALT, &dev->flags))
1914 rx_alloc_submit(dev, GFP_NOIO);
1915
1916 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1917 netif_tx_wake_all_queues(dev->net);
1918 tasklet_schedule (&dev->bh);
1919 }
1920 }
1921
1922 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1923 usb_autopm_get_interface_no_resume(intf);
1924
1925 return 0;
1926 }
1927 EXPORT_SYMBOL_GPL(usbnet_resume);
1928
1929 /*
1930 * Either a subdriver implements manage_power, then it is assumed to always
1931 * be ready to be suspended or it reports the readiness to be suspended
1932 * explicitly
1933 */
1934 void usbnet_device_suggests_idle(struct usbnet *dev)
1935 {
1936 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1937 dev->intf->needs_remote_wakeup = 1;
1938 usb_autopm_put_interface_async(dev->intf);
1939 }
1940 }
1941 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1942
1943 /*
1944 * For devices that can do without special commands
1945 */
1946 int usbnet_manage_power(struct usbnet *dev, int on)
1947 {
1948 dev->intf->needs_remote_wakeup = on;
1949 return 0;
1950 }
1951 EXPORT_SYMBOL(usbnet_manage_power);
1952
1953 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1954 {
1955 /* update link after link is reseted */
1956 if (link && !need_reset)
1957 netif_carrier_on(dev->net);
1958 else
1959 netif_carrier_off(dev->net);
1960
1961 if (need_reset && link)
1962 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1963 else
1964 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1965 }
1966 EXPORT_SYMBOL(usbnet_link_change);
1967
1968 /*-------------------------------------------------------------------------*/
1969 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1970 u16 value, u16 index, void *data, u16 size)
1971 {
1972 void *buf = NULL;
1973 int err = -ENOMEM;
1974
1975 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1976 " value=0x%04x index=0x%04x size=%d\n",
1977 cmd, reqtype, value, index, size);
1978
1979 if (size) {
1980 buf = kmalloc(size, GFP_KERNEL);
1981 if (!buf)
1982 goto out;
1983 }
1984
1985 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1986 cmd, reqtype, value, index, buf, size,
1987 USB_CTRL_GET_TIMEOUT);
1988 if (err > 0 && err <= size) {
1989 if (data)
1990 memcpy(data, buf, err);
1991 else
1992 netdev_dbg(dev->net,
1993 "Huh? Data requested but thrown away.\n");
1994 }
1995 kfree(buf);
1996 out:
1997 return err;
1998 }
1999
2000 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2001 u16 value, u16 index, const void *data,
2002 u16 size)
2003 {
2004 void *buf = NULL;
2005 int err = -ENOMEM;
2006
2007 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2008 " value=0x%04x index=0x%04x size=%d\n",
2009 cmd, reqtype, value, index, size);
2010
2011 if (data) {
2012 buf = kmemdup(data, size, GFP_KERNEL);
2013 if (!buf)
2014 goto out;
2015 } else {
2016 if (size) {
2017 WARN_ON_ONCE(1);
2018 err = -EINVAL;
2019 goto out;
2020 }
2021 }
2022
2023 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2024 cmd, reqtype, value, index, buf, size,
2025 USB_CTRL_SET_TIMEOUT);
2026 kfree(buf);
2027
2028 out:
2029 return err;
2030 }
2031
2032 /*
2033 * The function can't be called inside suspend/resume callback,
2034 * otherwise deadlock will be caused.
2035 */
2036 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2037 u16 value, u16 index, void *data, u16 size)
2038 {
2039 int ret;
2040
2041 if (usb_autopm_get_interface(dev->intf) < 0)
2042 return -ENODEV;
2043 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2044 data, size);
2045 usb_autopm_put_interface(dev->intf);
2046 return ret;
2047 }
2048 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2049
2050 /*
2051 * The function can't be called inside suspend/resume callback,
2052 * otherwise deadlock will be caused.
2053 */
2054 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2055 u16 value, u16 index, const void *data, u16 size)
2056 {
2057 int ret;
2058
2059 if (usb_autopm_get_interface(dev->intf) < 0)
2060 return -ENODEV;
2061 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2062 data, size);
2063 usb_autopm_put_interface(dev->intf);
2064 return ret;
2065 }
2066 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2067
2068 /*
2069 * The function can be called inside suspend/resume callback safely
2070 * and should only be called by suspend/resume callback generally.
2071 */
2072 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2073 u16 value, u16 index, void *data, u16 size)
2074 {
2075 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2076 data, size);
2077 }
2078 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2079
2080 /*
2081 * The function can be called inside suspend/resume callback safely
2082 * and should only be called by suspend/resume callback generally.
2083 */
2084 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2085 u16 value, u16 index, const void *data,
2086 u16 size)
2087 {
2088 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2089 data, size);
2090 }
2091 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2092
2093 static void usbnet_async_cmd_cb(struct urb *urb)
2094 {
2095 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2096 int status = urb->status;
2097
2098 if (status < 0)
2099 dev_dbg(&urb->dev->dev, "%s failed with %d",
2100 __func__, status);
2101
2102 kfree(req);
2103 usb_free_urb(urb);
2104 }
2105
2106 /*
2107 * The caller must make sure that device can't be put into suspend
2108 * state until the control URB completes.
2109 */
2110 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2111 u16 value, u16 index, const void *data, u16 size)
2112 {
2113 struct usb_ctrlrequest *req = NULL;
2114 struct urb *urb;
2115 int err = -ENOMEM;
2116 void *buf = NULL;
2117
2118 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2119 " value=0x%04x index=0x%04x size=%d\n",
2120 cmd, reqtype, value, index, size);
2121
2122 urb = usb_alloc_urb(0, GFP_ATOMIC);
2123 if (!urb)
2124 goto fail;
2125
2126 if (data) {
2127 buf = kmemdup(data, size, GFP_ATOMIC);
2128 if (!buf) {
2129 netdev_err(dev->net, "Error allocating buffer"
2130 " in %s!\n", __func__);
2131 goto fail_free;
2132 }
2133 }
2134
2135 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2136 if (!req)
2137 goto fail_free_buf;
2138
2139 req->bRequestType = reqtype;
2140 req->bRequest = cmd;
2141 req->wValue = cpu_to_le16(value);
2142 req->wIndex = cpu_to_le16(index);
2143 req->wLength = cpu_to_le16(size);
2144
2145 usb_fill_control_urb(urb, dev->udev,
2146 usb_sndctrlpipe(dev->udev, 0),
2147 (void *)req, buf, size,
2148 usbnet_async_cmd_cb, req);
2149 urb->transfer_flags |= URB_FREE_BUFFER;
2150
2151 err = usb_submit_urb(urb, GFP_ATOMIC);
2152 if (err < 0) {
2153 netdev_err(dev->net, "Error submitting the control"
2154 " message: status=%d\n", err);
2155 goto fail_free;
2156 }
2157 return 0;
2158
2159 fail_free_buf:
2160 kfree(buf);
2161 fail_free:
2162 kfree(req);
2163 usb_free_urb(urb);
2164 fail:
2165 return err;
2166
2167 }
2168 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2169 /*-------------------------------------------------------------------------*/
2170
2171 static int __init usbnet_init(void)
2172 {
2173 /* Compiler should optimize this out. */
2174 BUILD_BUG_ON(
2175 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2176
2177 eth_random_addr(node_id);
2178 return 0;
2179 }
2180 module_init(usbnet_init);
2181
2182 static void __exit usbnet_exit(void)
2183 {
2184 }
2185 module_exit(usbnet_exit);
2186
2187 MODULE_AUTHOR("David Brownell");
2188 MODULE_DESCRIPTION("USB network driver framework");
2189 MODULE_LICENSE("GPL");
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