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 */
usbnet_get_endpoints(struct usbnet * dev,struct usb_interface * intf)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
116 /* ignore endpoints which cannot transfer data */
117 if (!usb_endpoint_maxp(&e->desc))
118 continue;
119
120 switch (e->desc.bmAttributes) {
121 case USB_ENDPOINT_XFER_INT:
122 if (!usb_endpoint_dir_in(&e->desc))
123 continue;
124 intr = 1;
125 /* FALLTHROUGH */
126 case USB_ENDPOINT_XFER_BULK:
127 break;
128 default:
129 continue;
130 }
131 if (usb_endpoint_dir_in(&e->desc)) {
132 if (!intr && !in)
133 in = e;
134 else if (intr && !status)
135 status = e;
136 } else {
137 if (!out)
138 out = e;
139 }
140 }
141 if (in && out)
142 break;
143 }
144 if (!alt || !in || !out)
145 return -EINVAL;
146
147 if (alt->desc.bAlternateSetting != 0 ||
148 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
149 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
150 alt->desc.bAlternateSetting);
151 if (tmp < 0)
152 return tmp;
153 }
154
155 dev->in = usb_rcvbulkpipe (dev->udev,
156 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
157 dev->out = usb_sndbulkpipe (dev->udev,
158 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
159 dev->status = status;
160 return 0;
161 }
162 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
163
usbnet_get_ethernet_addr(struct usbnet * dev,int iMACAddress)164 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
165 {
166 int tmp = -1, ret;
167 unsigned char buf [13];
168
169 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
170 if (ret == 12)
171 tmp = hex2bin(dev->net->dev_addr, buf, 6);
172 if (tmp < 0) {
173 dev_dbg(&dev->udev->dev,
174 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
175 if (ret >= 0)
176 ret = -EINVAL;
177 return ret;
178 }
179 return 0;
180 }
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
intr_complete(struct urb * urb)183 static void intr_complete (struct urb *urb)
184 {
185 struct usbnet *dev = urb->context;
186 int status = urb->status;
187
188 switch (status) {
189 /* success */
190 case 0:
191 dev->driver_info->status(dev, urb);
192 break;
193
194 /* software-driven interface shutdown */
195 case -ENOENT: /* urb killed */
196 case -ESHUTDOWN: /* hardware gone */
197 netif_dbg(dev, ifdown, dev->net,
198 "intr shutdown, code %d\n", status);
199 return;
200
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
203 */
204 default:
205 netdev_dbg(dev->net, "intr status %d\n", status);
206 break;
207 }
208
209 status = usb_submit_urb (urb, GFP_ATOMIC);
210 if (status != 0)
211 netif_err(dev, timer, dev->net,
212 "intr resubmit --> %d\n", status);
213 }
214
init_status(struct usbnet * dev,struct usb_interface * intf)215 static int init_status (struct usbnet *dev, struct usb_interface *intf)
216 {
217 char *buf = NULL;
218 unsigned pipe = 0;
219 unsigned maxp;
220 unsigned period;
221
222 if (!dev->driver_info->status)
223 return 0;
224
225 pipe = usb_rcvintpipe (dev->udev,
226 dev->status->desc.bEndpointAddress
227 & USB_ENDPOINT_NUMBER_MASK);
228 maxp = usb_maxpacket (dev->udev, pipe, 0);
229
230 /* avoid 1 msec chatter: min 8 msec poll rate */
231 period = max ((int) dev->status->desc.bInterval,
232 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
233
234 buf = kmalloc (maxp, GFP_KERNEL);
235 if (buf) {
236 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
237 if (!dev->interrupt) {
238 kfree (buf);
239 return -ENOMEM;
240 } else {
241 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
242 buf, maxp, intr_complete, dev, period);
243 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
244 dev_dbg(&intf->dev,
245 "status ep%din, %d bytes period %d\n",
246 usb_pipeendpoint(pipe), maxp, period);
247 }
248 }
249 return 0;
250 }
251
252 /* Submit the interrupt URB if not previously submitted, increasing refcount */
usbnet_status_start(struct usbnet * dev,gfp_t mem_flags)253 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
254 {
255 int ret = 0;
256
257 WARN_ON_ONCE(dev->interrupt == NULL);
258 if (dev->interrupt) {
259 mutex_lock(&dev->interrupt_mutex);
260
261 if (++dev->interrupt_count == 1)
262 ret = usb_submit_urb(dev->interrupt, mem_flags);
263
264 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
265 dev->interrupt_count);
266 mutex_unlock(&dev->interrupt_mutex);
267 }
268 return ret;
269 }
270 EXPORT_SYMBOL_GPL(usbnet_status_start);
271
272 /* For resume; submit interrupt URB if previously submitted */
__usbnet_status_start_force(struct usbnet * dev,gfp_t mem_flags)273 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
274 {
275 int ret = 0;
276
277 mutex_lock(&dev->interrupt_mutex);
278 if (dev->interrupt_count) {
279 ret = usb_submit_urb(dev->interrupt, mem_flags);
280 dev_dbg(&dev->udev->dev,
281 "submitted interrupt URB for resume\n");
282 }
283 mutex_unlock(&dev->interrupt_mutex);
284 return ret;
285 }
286
287 /* Kill the interrupt URB if all submitters want it killed */
usbnet_status_stop(struct usbnet * dev)288 void usbnet_status_stop(struct usbnet *dev)
289 {
290 if (dev->interrupt) {
291 mutex_lock(&dev->interrupt_mutex);
292 WARN_ON(dev->interrupt_count == 0);
293
294 if (dev->interrupt_count && --dev->interrupt_count == 0)
295 usb_kill_urb(dev->interrupt);
296
297 dev_dbg(&dev->udev->dev,
298 "decremented interrupt URB count to %d\n",
299 dev->interrupt_count);
300 mutex_unlock(&dev->interrupt_mutex);
301 }
302 }
303 EXPORT_SYMBOL_GPL(usbnet_status_stop);
304
305 /* For suspend; always kill interrupt URB */
__usbnet_status_stop_force(struct usbnet * dev)306 static void __usbnet_status_stop_force(struct usbnet *dev)
307 {
308 if (dev->interrupt) {
309 mutex_lock(&dev->interrupt_mutex);
310 usb_kill_urb(dev->interrupt);
311 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
312 mutex_unlock(&dev->interrupt_mutex);
313 }
314 }
315
316 /* Passes this packet up the stack, updating its accounting.
317 * Some link protocols batch packets, so their rx_fixup paths
318 * can return clones as well as just modify the original skb.
319 */
usbnet_skb_return(struct usbnet * dev,struct sk_buff * skb)320 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
321 {
322 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
323 unsigned long flags;
324 int status;
325
326 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
327 skb_queue_tail(&dev->rxq_pause, skb);
328 return;
329 }
330
331 /* only update if unset to allow minidriver rx_fixup override */
332 if (skb->protocol == 0)
333 skb->protocol = eth_type_trans (skb, dev->net);
334
335 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
336 stats64->rx_packets++;
337 stats64->rx_bytes += skb->len;
338 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
339
340 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
341 skb->len + sizeof (struct ethhdr), skb->protocol);
342 memset (skb->cb, 0, sizeof (struct skb_data));
343
344 if (skb_defer_rx_timestamp(skb))
345 return;
346
347 status = netif_rx (skb);
348 if (status != NET_RX_SUCCESS)
349 netif_dbg(dev, rx_err, dev->net,
350 "netif_rx status %d\n", status);
351 }
352 EXPORT_SYMBOL_GPL(usbnet_skb_return);
353
354 /* must be called if hard_mtu or rx_urb_size changed */
usbnet_update_max_qlen(struct usbnet * dev)355 void usbnet_update_max_qlen(struct usbnet *dev)
356 {
357 enum usb_device_speed speed = dev->udev->speed;
358
359 if (!dev->rx_urb_size || !dev->hard_mtu)
360 goto insanity;
361 switch (speed) {
362 case USB_SPEED_HIGH:
363 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
364 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
365 break;
366 case USB_SPEED_SUPER:
367 case USB_SPEED_SUPER_PLUS:
368 /*
369 * Not take default 5ms qlen for super speed HC to
370 * save memory, and iperf tests show 2.5ms qlen can
371 * work well
372 */
373 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
374 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
375 break;
376 default:
377 insanity:
378 dev->rx_qlen = dev->tx_qlen = 4;
379 }
380 }
381 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
382
383
384 /*-------------------------------------------------------------------------
385 *
386 * Network Device Driver (peer link to "Host Device", from USB host)
387 *
388 *-------------------------------------------------------------------------*/
389
usbnet_change_mtu(struct net_device * net,int new_mtu)390 int usbnet_change_mtu (struct net_device *net, int new_mtu)
391 {
392 struct usbnet *dev = netdev_priv(net);
393 int ll_mtu = new_mtu + net->hard_header_len;
394 int old_hard_mtu = dev->hard_mtu;
395 int old_rx_urb_size = dev->rx_urb_size;
396
397 // no second zero-length packet read wanted after mtu-sized packets
398 if ((ll_mtu % dev->maxpacket) == 0)
399 return -EDOM;
400 net->mtu = new_mtu;
401
402 dev->hard_mtu = net->mtu + net->hard_header_len;
403 if (dev->rx_urb_size == old_hard_mtu) {
404 dev->rx_urb_size = dev->hard_mtu;
405 if (dev->rx_urb_size > old_rx_urb_size) {
406 usbnet_pause_rx(dev);
407 usbnet_unlink_rx_urbs(dev);
408 usbnet_resume_rx(dev);
409 }
410 }
411
412 /* max qlen depend on hard_mtu and rx_urb_size */
413 usbnet_update_max_qlen(dev);
414
415 return 0;
416 }
417 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
418
419 /* The caller must hold list->lock */
__usbnet_queue_skb(struct sk_buff_head * list,struct sk_buff * newsk,enum skb_state state)420 static void __usbnet_queue_skb(struct sk_buff_head *list,
421 struct sk_buff *newsk, enum skb_state state)
422 {
423 struct skb_data *entry = (struct skb_data *) newsk->cb;
424
425 __skb_queue_tail(list, newsk);
426 entry->state = state;
427 }
428
429 /*-------------------------------------------------------------------------*/
430
431 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
432 * completion callbacks. 2.5 should have fixed those bugs...
433 */
434
defer_bh(struct usbnet * dev,struct sk_buff * skb,struct sk_buff_head * list,enum skb_state state)435 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
436 struct sk_buff_head *list, enum skb_state state)
437 {
438 unsigned long flags;
439 enum skb_state old_state;
440 struct skb_data *entry = (struct skb_data *) skb->cb;
441
442 spin_lock_irqsave(&list->lock, flags);
443 old_state = entry->state;
444 entry->state = state;
445 __skb_unlink(skb, list);
446
447 /* defer_bh() is never called with list == &dev->done.
448 * spin_lock_nested() tells lockdep that it is OK to take
449 * dev->done.lock here with list->lock held.
450 */
451 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
452
453 __skb_queue_tail(&dev->done, skb);
454 if (dev->done.qlen == 1)
455 tasklet_schedule(&dev->bh);
456 spin_unlock(&dev->done.lock);
457 spin_unlock_irqrestore(&list->lock, flags);
458 return old_state;
459 }
460
461 /* some work can't be done in tasklets, so we use keventd
462 *
463 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
464 * but tasklet_schedule() doesn't. hope the failure is rare.
465 */
usbnet_defer_kevent(struct usbnet * dev,int work)466 void usbnet_defer_kevent (struct usbnet *dev, int work)
467 {
468 set_bit (work, &dev->flags);
469 if (!schedule_work (&dev->kevent))
470 netdev_dbg(dev->net, "kevent %d may have been dropped\n", work);
471 else
472 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
473 }
474 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
475
476 /*-------------------------------------------------------------------------*/
477
478 static void rx_complete (struct urb *urb);
479
rx_submit(struct usbnet * dev,struct urb * urb,gfp_t flags)480 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
481 {
482 struct sk_buff *skb;
483 struct skb_data *entry;
484 int retval = 0;
485 unsigned long lockflags;
486 size_t size = dev->rx_urb_size;
487
488 /* prevent rx skb allocation when error ratio is high */
489 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
490 usb_free_urb(urb);
491 return -ENOLINK;
492 }
493
494 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
495 skb = __netdev_alloc_skb(dev->net, size, flags);
496 else
497 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
498 if (!skb) {
499 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
500 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
501 usb_free_urb (urb);
502 return -ENOMEM;
503 }
504
505 entry = (struct skb_data *) skb->cb;
506 entry->urb = urb;
507 entry->dev = dev;
508 entry->length = 0;
509
510 usb_fill_bulk_urb (urb, dev->udev, dev->in,
511 skb->data, size, rx_complete, skb);
512
513 spin_lock_irqsave (&dev->rxq.lock, lockflags);
514
515 if (netif_running (dev->net) &&
516 netif_device_present (dev->net) &&
517 test_bit(EVENT_DEV_OPEN, &dev->flags) &&
518 !test_bit (EVENT_RX_HALT, &dev->flags) &&
519 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
520 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
521 case -EPIPE:
522 usbnet_defer_kevent (dev, EVENT_RX_HALT);
523 break;
524 case -ENOMEM:
525 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
526 break;
527 case -ENODEV:
528 netif_dbg(dev, ifdown, dev->net, "device gone\n");
529 netif_device_detach (dev->net);
530 break;
531 case -EHOSTUNREACH:
532 retval = -ENOLINK;
533 break;
534 default:
535 netif_dbg(dev, rx_err, dev->net,
536 "rx submit, %d\n", retval);
537 tasklet_schedule (&dev->bh);
538 break;
539 case 0:
540 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
541 }
542 } else {
543 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
544 retval = -ENOLINK;
545 }
546 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
547 if (retval) {
548 dev_kfree_skb_any (skb);
549 usb_free_urb (urb);
550 }
551 return retval;
552 }
553
554
555 /*-------------------------------------------------------------------------*/
556
rx_process(struct usbnet * dev,struct sk_buff * skb)557 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
558 {
559 if (dev->driver_info->rx_fixup &&
560 !dev->driver_info->rx_fixup (dev, skb)) {
561 /* With RX_ASSEMBLE, rx_fixup() must update counters */
562 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
563 dev->net->stats.rx_errors++;
564 goto done;
565 }
566 // else network stack removes extra byte if we forced a short packet
567
568 /* all data was already cloned from skb inside the driver */
569 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
570 goto done;
571
572 if (skb->len < ETH_HLEN) {
573 dev->net->stats.rx_errors++;
574 dev->net->stats.rx_length_errors++;
575 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
576 } else {
577 usbnet_skb_return(dev, skb);
578 return;
579 }
580
581 done:
582 skb_queue_tail(&dev->done, skb);
583 }
584
585 /*-------------------------------------------------------------------------*/
586
rx_complete(struct urb * urb)587 static void rx_complete (struct urb *urb)
588 {
589 struct sk_buff *skb = (struct sk_buff *) urb->context;
590 struct skb_data *entry = (struct skb_data *) skb->cb;
591 struct usbnet *dev = entry->dev;
592 int urb_status = urb->status;
593 enum skb_state state;
594
595 skb_put (skb, urb->actual_length);
596 state = rx_done;
597 entry->urb = NULL;
598
599 switch (urb_status) {
600 /* success */
601 case 0:
602 break;
603
604 /* stalls need manual reset. this is rare ... except that
605 * when going through USB 2.0 TTs, unplug appears this way.
606 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
607 * storm, recovering as needed.
608 */
609 case -EPIPE:
610 dev->net->stats.rx_errors++;
611 usbnet_defer_kevent (dev, EVENT_RX_HALT);
612 // FALLTHROUGH
613
614 /* software-driven interface shutdown */
615 case -ECONNRESET: /* async unlink */
616 case -ESHUTDOWN: /* hardware gone */
617 netif_dbg(dev, ifdown, dev->net,
618 "rx shutdown, code %d\n", urb_status);
619 goto block;
620
621 /* we get controller i/o faults during hub_wq disconnect() delays.
622 * throttle down resubmits, to avoid log floods; just temporarily,
623 * so we still recover when the fault isn't a hub_wq delay.
624 */
625 case -EPROTO:
626 case -ETIME:
627 case -EILSEQ:
628 dev->net->stats.rx_errors++;
629 if (!timer_pending (&dev->delay)) {
630 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
631 netif_dbg(dev, link, dev->net,
632 "rx throttle %d\n", urb_status);
633 }
634 block:
635 state = rx_cleanup;
636 entry->urb = urb;
637 urb = NULL;
638 break;
639
640 /* data overrun ... flush fifo? */
641 case -EOVERFLOW:
642 dev->net->stats.rx_over_errors++;
643 // FALLTHROUGH
644
645 default:
646 state = rx_cleanup;
647 dev->net->stats.rx_errors++;
648 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
649 break;
650 }
651
652 /* stop rx if packet error rate is high */
653 if (++dev->pkt_cnt > 30) {
654 dev->pkt_cnt = 0;
655 dev->pkt_err = 0;
656 } else {
657 if (state == rx_cleanup)
658 dev->pkt_err++;
659 if (dev->pkt_err > 20)
660 set_bit(EVENT_RX_KILL, &dev->flags);
661 }
662
663 state = defer_bh(dev, skb, &dev->rxq, state);
664
665 if (urb) {
666 if (netif_running (dev->net) &&
667 !test_bit (EVENT_RX_HALT, &dev->flags) &&
668 state != unlink_start) {
669 rx_submit (dev, urb, GFP_ATOMIC);
670 usb_mark_last_busy(dev->udev);
671 return;
672 }
673 usb_free_urb (urb);
674 }
675 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
676 }
677
678 /*-------------------------------------------------------------------------*/
usbnet_pause_rx(struct usbnet * dev)679 void usbnet_pause_rx(struct usbnet *dev)
680 {
681 set_bit(EVENT_RX_PAUSED, &dev->flags);
682
683 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
684 }
685 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
686
usbnet_resume_rx(struct usbnet * dev)687 void usbnet_resume_rx(struct usbnet *dev)
688 {
689 struct sk_buff *skb;
690 int num = 0;
691
692 clear_bit(EVENT_RX_PAUSED, &dev->flags);
693
694 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
695 usbnet_skb_return(dev, skb);
696 num++;
697 }
698
699 tasklet_schedule(&dev->bh);
700
701 netif_dbg(dev, rx_status, dev->net,
702 "paused rx queue disabled, %d skbs requeued\n", num);
703 }
704 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
705
usbnet_purge_paused_rxq(struct usbnet * dev)706 void usbnet_purge_paused_rxq(struct usbnet *dev)
707 {
708 skb_queue_purge(&dev->rxq_pause);
709 }
710 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
711
712 /*-------------------------------------------------------------------------*/
713
714 // unlink pending rx/tx; completion handlers do all other cleanup
715
unlink_urbs(struct usbnet * dev,struct sk_buff_head * q)716 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
717 {
718 unsigned long flags;
719 struct sk_buff *skb;
720 int count = 0;
721
722 spin_lock_irqsave (&q->lock, flags);
723 while (!skb_queue_empty(q)) {
724 struct skb_data *entry;
725 struct urb *urb;
726 int retval;
727
728 skb_queue_walk(q, skb) {
729 entry = (struct skb_data *) skb->cb;
730 if (entry->state != unlink_start)
731 goto found;
732 }
733 break;
734 found:
735 entry->state = unlink_start;
736 urb = entry->urb;
737
738 /*
739 * Get reference count of the URB to avoid it to be
740 * freed during usb_unlink_urb, which may trigger
741 * use-after-free problem inside usb_unlink_urb since
742 * usb_unlink_urb is always racing with .complete
743 * handler(include defer_bh).
744 */
745 usb_get_urb(urb);
746 spin_unlock_irqrestore(&q->lock, flags);
747 // during some PM-driven resume scenarios,
748 // these (async) unlinks complete immediately
749 retval = usb_unlink_urb (urb);
750 if (retval != -EINPROGRESS && retval != 0)
751 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
752 else
753 count++;
754 usb_put_urb(urb);
755 spin_lock_irqsave(&q->lock, flags);
756 }
757 spin_unlock_irqrestore (&q->lock, flags);
758 return count;
759 }
760
761 // Flush all pending rx urbs
762 // minidrivers may need to do this when the MTU changes
763
usbnet_unlink_rx_urbs(struct usbnet * dev)764 void usbnet_unlink_rx_urbs(struct usbnet *dev)
765 {
766 if (netif_running(dev->net)) {
767 (void) unlink_urbs (dev, &dev->rxq);
768 tasklet_schedule(&dev->bh);
769 }
770 }
771 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
772
773 /*-------------------------------------------------------------------------*/
774
wait_skb_queue_empty(struct sk_buff_head * q)775 static void wait_skb_queue_empty(struct sk_buff_head *q)
776 {
777 unsigned long flags;
778
779 spin_lock_irqsave(&q->lock, flags);
780 while (!skb_queue_empty(q)) {
781 spin_unlock_irqrestore(&q->lock, flags);
782 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
783 set_current_state(TASK_UNINTERRUPTIBLE);
784 spin_lock_irqsave(&q->lock, flags);
785 }
786 spin_unlock_irqrestore(&q->lock, flags);
787 }
788
789 // precondition: never called in_interrupt
usbnet_terminate_urbs(struct usbnet * dev)790 static void usbnet_terminate_urbs(struct usbnet *dev)
791 {
792 DECLARE_WAITQUEUE(wait, current);
793 int temp;
794
795 /* ensure there are no more active urbs */
796 add_wait_queue(&dev->wait, &wait);
797 set_current_state(TASK_UNINTERRUPTIBLE);
798 temp = unlink_urbs(dev, &dev->txq) +
799 unlink_urbs(dev, &dev->rxq);
800
801 /* maybe wait for deletions to finish. */
802 wait_skb_queue_empty(&dev->rxq);
803 wait_skb_queue_empty(&dev->txq);
804 wait_skb_queue_empty(&dev->done);
805 netif_dbg(dev, ifdown, dev->net,
806 "waited for %d urb completions\n", temp);
807 set_current_state(TASK_RUNNING);
808 remove_wait_queue(&dev->wait, &wait);
809 }
810
usbnet_stop(struct net_device * net)811 int usbnet_stop (struct net_device *net)
812 {
813 struct usbnet *dev = netdev_priv(net);
814 struct driver_info *info = dev->driver_info;
815 int retval, pm, mpn;
816
817 clear_bit(EVENT_DEV_OPEN, &dev->flags);
818 netif_stop_queue (net);
819
820 netif_info(dev, ifdown, dev->net,
821 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
822 net->stats.rx_packets, net->stats.tx_packets,
823 net->stats.rx_errors, net->stats.tx_errors);
824
825 /* to not race resume */
826 pm = usb_autopm_get_interface(dev->intf);
827 /* allow minidriver to stop correctly (wireless devices to turn off
828 * radio etc) */
829 if (info->stop) {
830 retval = info->stop(dev);
831 if (retval < 0)
832 netif_info(dev, ifdown, dev->net,
833 "stop fail (%d) usbnet usb-%s-%s, %s\n",
834 retval,
835 dev->udev->bus->bus_name, dev->udev->devpath,
836 info->description);
837 }
838
839 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
840 usbnet_terminate_urbs(dev);
841
842 usbnet_status_stop(dev);
843
844 usbnet_purge_paused_rxq(dev);
845
846 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
847
848 /* deferred work (task, timer, softirq) must also stop.
849 * can't flush_scheduled_work() until we drop rtnl (later),
850 * else workers could deadlock; so make workers a NOP.
851 */
852 dev->flags = 0;
853 del_timer_sync (&dev->delay);
854 tasklet_kill (&dev->bh);
855 if (!pm)
856 usb_autopm_put_interface(dev->intf);
857
858 if (info->manage_power && mpn)
859 info->manage_power(dev, 0);
860 else
861 usb_autopm_put_interface(dev->intf);
862
863 return 0;
864 }
865 EXPORT_SYMBOL_GPL(usbnet_stop);
866
867 /*-------------------------------------------------------------------------*/
868
869 // posts reads, and enables write queuing
870
871 // precondition: never called in_interrupt
872
usbnet_open(struct net_device * net)873 int usbnet_open (struct net_device *net)
874 {
875 struct usbnet *dev = netdev_priv(net);
876 int retval;
877 struct driver_info *info = dev->driver_info;
878
879 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
880 netif_info(dev, ifup, dev->net,
881 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
882 retval,
883 dev->udev->bus->bus_name,
884 dev->udev->devpath,
885 info->description);
886 goto done_nopm;
887 }
888
889 // put into "known safe" state
890 if (info->reset && (retval = info->reset (dev)) < 0) {
891 netif_info(dev, ifup, dev->net,
892 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
893 retval,
894 dev->udev->bus->bus_name,
895 dev->udev->devpath,
896 info->description);
897 goto done;
898 }
899
900 /* hard_mtu or rx_urb_size may change in reset() */
901 usbnet_update_max_qlen(dev);
902
903 // insist peer be connected
904 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
905 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
906 goto done;
907 }
908
909 /* start any status interrupt transfer */
910 if (dev->interrupt) {
911 retval = usbnet_status_start(dev, GFP_KERNEL);
912 if (retval < 0) {
913 netif_err(dev, ifup, dev->net,
914 "intr submit %d\n", retval);
915 goto done;
916 }
917 }
918
919 set_bit(EVENT_DEV_OPEN, &dev->flags);
920 netif_start_queue (net);
921 netif_info(dev, ifup, dev->net,
922 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
923 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
924 dev->net->mtu,
925 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
926 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
927 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
928 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
929 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
930 "simple");
931
932 /* reset rx error state */
933 dev->pkt_cnt = 0;
934 dev->pkt_err = 0;
935 clear_bit(EVENT_RX_KILL, &dev->flags);
936
937 // delay posting reads until we're fully open
938 tasklet_schedule (&dev->bh);
939 if (info->manage_power) {
940 retval = info->manage_power(dev, 1);
941 if (retval < 0) {
942 retval = 0;
943 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
944 } else {
945 usb_autopm_put_interface(dev->intf);
946 }
947 }
948 return retval;
949 done:
950 usb_autopm_put_interface(dev->intf);
951 done_nopm:
952 return retval;
953 }
954 EXPORT_SYMBOL_GPL(usbnet_open);
955
956 /*-------------------------------------------------------------------------*/
957
958 /* ethtool methods; minidrivers may need to add some more, but
959 * they'll probably want to use this base set.
960 */
961
usbnet_get_link_ksettings(struct net_device * net,struct ethtool_link_ksettings * cmd)962 int usbnet_get_link_ksettings(struct net_device *net,
963 struct ethtool_link_ksettings *cmd)
964 {
965 struct usbnet *dev = netdev_priv(net);
966
967 if (!dev->mii.mdio_read)
968 return -EOPNOTSUPP;
969
970 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
971
972 return 0;
973 }
974 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings);
975
usbnet_set_link_ksettings(struct net_device * net,const struct ethtool_link_ksettings * cmd)976 int usbnet_set_link_ksettings(struct net_device *net,
977 const struct ethtool_link_ksettings *cmd)
978 {
979 struct usbnet *dev = netdev_priv(net);
980 int retval;
981
982 if (!dev->mii.mdio_write)
983 return -EOPNOTSUPP;
984
985 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
986
987 /* link speed/duplex might have changed */
988 if (dev->driver_info->link_reset)
989 dev->driver_info->link_reset(dev);
990
991 /* hard_mtu or rx_urb_size may change in link_reset() */
992 usbnet_update_max_qlen(dev);
993
994 return retval;
995 }
996 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings);
997
usbnet_get_stats64(struct net_device * net,struct rtnl_link_stats64 * stats)998 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats)
999 {
1000 struct usbnet *dev = netdev_priv(net);
1001 unsigned int start;
1002 int cpu;
1003
1004 netdev_stats_to_stats64(stats, &net->stats);
1005
1006 for_each_possible_cpu(cpu) {
1007 struct pcpu_sw_netstats *stats64;
1008 u64 rx_packets, rx_bytes;
1009 u64 tx_packets, tx_bytes;
1010
1011 stats64 = per_cpu_ptr(dev->stats64, cpu);
1012
1013 do {
1014 start = u64_stats_fetch_begin_irq(&stats64->syncp);
1015 rx_packets = stats64->rx_packets;
1016 rx_bytes = stats64->rx_bytes;
1017 tx_packets = stats64->tx_packets;
1018 tx_bytes = stats64->tx_bytes;
1019 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
1020
1021 stats->rx_packets += rx_packets;
1022 stats->rx_bytes += rx_bytes;
1023 stats->tx_packets += tx_packets;
1024 stats->tx_bytes += tx_bytes;
1025 }
1026 }
1027 EXPORT_SYMBOL_GPL(usbnet_get_stats64);
1028
usbnet_get_link(struct net_device * net)1029 u32 usbnet_get_link (struct net_device *net)
1030 {
1031 struct usbnet *dev = netdev_priv(net);
1032
1033 /* If a check_connect is defined, return its result */
1034 if (dev->driver_info->check_connect)
1035 return dev->driver_info->check_connect (dev) == 0;
1036
1037 /* if the device has mii operations, use those */
1038 if (dev->mii.mdio_read)
1039 return mii_link_ok(&dev->mii);
1040
1041 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
1042 return ethtool_op_get_link(net);
1043 }
1044 EXPORT_SYMBOL_GPL(usbnet_get_link);
1045
usbnet_nway_reset(struct net_device * net)1046 int usbnet_nway_reset(struct net_device *net)
1047 {
1048 struct usbnet *dev = netdev_priv(net);
1049
1050 if (!dev->mii.mdio_write)
1051 return -EOPNOTSUPP;
1052
1053 return mii_nway_restart(&dev->mii);
1054 }
1055 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1056
usbnet_get_drvinfo(struct net_device * net,struct ethtool_drvinfo * info)1057 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1058 {
1059 struct usbnet *dev = netdev_priv(net);
1060
1061 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1062 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1063 strlcpy (info->fw_version, dev->driver_info->description,
1064 sizeof info->fw_version);
1065 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1066 }
1067 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1068
usbnet_get_msglevel(struct net_device * net)1069 u32 usbnet_get_msglevel (struct net_device *net)
1070 {
1071 struct usbnet *dev = netdev_priv(net);
1072
1073 return dev->msg_enable;
1074 }
1075 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1076
usbnet_set_msglevel(struct net_device * net,u32 level)1077 void usbnet_set_msglevel (struct net_device *net, u32 level)
1078 {
1079 struct usbnet *dev = netdev_priv(net);
1080
1081 dev->msg_enable = level;
1082 }
1083 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1084
1085 /* drivers may override default ethtool_ops in their bind() routine */
1086 static const struct ethtool_ops usbnet_ethtool_ops = {
1087 .get_link = usbnet_get_link,
1088 .nway_reset = usbnet_nway_reset,
1089 .get_drvinfo = usbnet_get_drvinfo,
1090 .get_msglevel = usbnet_get_msglevel,
1091 .set_msglevel = usbnet_set_msglevel,
1092 .get_ts_info = ethtool_op_get_ts_info,
1093 .get_link_ksettings = usbnet_get_link_ksettings,
1094 .set_link_ksettings = usbnet_set_link_ksettings,
1095 };
1096
1097 /*-------------------------------------------------------------------------*/
1098
__handle_link_change(struct usbnet * dev)1099 static void __handle_link_change(struct usbnet *dev)
1100 {
1101 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1102 return;
1103
1104 if (!netif_carrier_ok(dev->net)) {
1105 /* kill URBs for reading packets to save bus bandwidth */
1106 unlink_urbs(dev, &dev->rxq);
1107
1108 /*
1109 * tx_timeout will unlink URBs for sending packets and
1110 * tx queue is stopped by netcore after link becomes off
1111 */
1112 } else {
1113 /* submitting URBs for reading packets */
1114 tasklet_schedule(&dev->bh);
1115 }
1116
1117 /* hard_mtu or rx_urb_size may change during link change */
1118 usbnet_update_max_qlen(dev);
1119
1120 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1121 }
1122
usbnet_set_rx_mode(struct net_device * net)1123 static void usbnet_set_rx_mode(struct net_device *net)
1124 {
1125 struct usbnet *dev = netdev_priv(net);
1126
1127 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1128 }
1129
__handle_set_rx_mode(struct usbnet * dev)1130 static void __handle_set_rx_mode(struct usbnet *dev)
1131 {
1132 if (dev->driver_info->set_rx_mode)
1133 (dev->driver_info->set_rx_mode)(dev);
1134
1135 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1136 }
1137
1138 /* work that cannot be done in interrupt context uses keventd.
1139 *
1140 * NOTE: with 2.5 we could do more of this using completion callbacks,
1141 * especially now that control transfers can be queued.
1142 */
1143 static void
usbnet_deferred_kevent(struct work_struct * work)1144 usbnet_deferred_kevent (struct work_struct *work)
1145 {
1146 struct usbnet *dev =
1147 container_of(work, struct usbnet, kevent);
1148 int status;
1149
1150 /* usb_clear_halt() needs a thread context */
1151 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1152 unlink_urbs (dev, &dev->txq);
1153 status = usb_autopm_get_interface(dev->intf);
1154 if (status < 0)
1155 goto fail_pipe;
1156 status = usb_clear_halt (dev->udev, dev->out);
1157 usb_autopm_put_interface(dev->intf);
1158 if (status < 0 &&
1159 status != -EPIPE &&
1160 status != -ESHUTDOWN) {
1161 if (netif_msg_tx_err (dev))
1162 fail_pipe:
1163 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1164 status);
1165 } else {
1166 clear_bit (EVENT_TX_HALT, &dev->flags);
1167 if (status != -ESHUTDOWN)
1168 netif_wake_queue (dev->net);
1169 }
1170 }
1171 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1172 unlink_urbs (dev, &dev->rxq);
1173 status = usb_autopm_get_interface(dev->intf);
1174 if (status < 0)
1175 goto fail_halt;
1176 status = usb_clear_halt (dev->udev, dev->in);
1177 usb_autopm_put_interface(dev->intf);
1178 if (status < 0 &&
1179 status != -EPIPE &&
1180 status != -ESHUTDOWN) {
1181 if (netif_msg_rx_err (dev))
1182 fail_halt:
1183 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1184 status);
1185 } else {
1186 clear_bit (EVENT_RX_HALT, &dev->flags);
1187 tasklet_schedule (&dev->bh);
1188 }
1189 }
1190
1191 /* tasklet could resubmit itself forever if memory is tight */
1192 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1193 struct urb *urb = NULL;
1194 int resched = 1;
1195
1196 if (netif_running (dev->net))
1197 urb = usb_alloc_urb (0, GFP_KERNEL);
1198 else
1199 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1200 if (urb != NULL) {
1201 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1202 status = usb_autopm_get_interface(dev->intf);
1203 if (status < 0) {
1204 usb_free_urb(urb);
1205 goto fail_lowmem;
1206 }
1207 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1208 resched = 0;
1209 usb_autopm_put_interface(dev->intf);
1210 fail_lowmem:
1211 if (resched)
1212 tasklet_schedule (&dev->bh);
1213 }
1214 }
1215
1216 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1217 struct driver_info *info = dev->driver_info;
1218 int retval = 0;
1219
1220 clear_bit (EVENT_LINK_RESET, &dev->flags);
1221 status = usb_autopm_get_interface(dev->intf);
1222 if (status < 0)
1223 goto skip_reset;
1224 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1225 usb_autopm_put_interface(dev->intf);
1226 skip_reset:
1227 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1228 retval,
1229 dev->udev->bus->bus_name,
1230 dev->udev->devpath,
1231 info->description);
1232 } else {
1233 usb_autopm_put_interface(dev->intf);
1234 }
1235
1236 /* handle link change from link resetting */
1237 __handle_link_change(dev);
1238 }
1239
1240 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1241 __handle_link_change(dev);
1242
1243 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1244 __handle_set_rx_mode(dev);
1245
1246
1247 if (dev->flags)
1248 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1249 }
1250
1251 /*-------------------------------------------------------------------------*/
1252
tx_complete(struct urb * urb)1253 static void tx_complete (struct urb *urb)
1254 {
1255 struct sk_buff *skb = (struct sk_buff *) urb->context;
1256 struct skb_data *entry = (struct skb_data *) skb->cb;
1257 struct usbnet *dev = entry->dev;
1258
1259 if (urb->status == 0) {
1260 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
1261 unsigned long flags;
1262
1263 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
1264 stats64->tx_packets += entry->packets;
1265 stats64->tx_bytes += entry->length;
1266 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
1267 } else {
1268 dev->net->stats.tx_errors++;
1269
1270 switch (urb->status) {
1271 case -EPIPE:
1272 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1273 break;
1274
1275 /* software-driven interface shutdown */
1276 case -ECONNRESET: // async unlink
1277 case -ESHUTDOWN: // hardware gone
1278 break;
1279
1280 /* like rx, tx gets controller i/o faults during hub_wq
1281 * delays and so it uses the same throttling mechanism.
1282 */
1283 case -EPROTO:
1284 case -ETIME:
1285 case -EILSEQ:
1286 usb_mark_last_busy(dev->udev);
1287 if (!timer_pending (&dev->delay)) {
1288 mod_timer (&dev->delay,
1289 jiffies + THROTTLE_JIFFIES);
1290 netif_dbg(dev, link, dev->net,
1291 "tx throttle %d\n", urb->status);
1292 }
1293 netif_stop_queue (dev->net);
1294 break;
1295 default:
1296 netif_dbg(dev, tx_err, dev->net,
1297 "tx err %d\n", entry->urb->status);
1298 break;
1299 }
1300 }
1301
1302 usb_autopm_put_interface_async(dev->intf);
1303 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1304 }
1305
1306 /*-------------------------------------------------------------------------*/
1307
usbnet_tx_timeout(struct net_device * net)1308 void usbnet_tx_timeout (struct net_device *net)
1309 {
1310 struct usbnet *dev = netdev_priv(net);
1311
1312 unlink_urbs (dev, &dev->txq);
1313 tasklet_schedule (&dev->bh);
1314 /* this needs to be handled individually because the generic layer
1315 * doesn't know what is sufficient and could not restore private
1316 * information if a remedy of an unconditional reset were used.
1317 */
1318 if (dev->driver_info->recover)
1319 (dev->driver_info->recover)(dev);
1320 }
1321 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1322
1323 /*-------------------------------------------------------------------------*/
1324
build_dma_sg(const struct sk_buff * skb,struct urb * urb)1325 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1326 {
1327 unsigned num_sgs, total_len = 0;
1328 int i, s = 0;
1329
1330 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1331 if (num_sgs == 1)
1332 return 0;
1333
1334 /* reserve one for zero packet */
1335 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),
1336 GFP_ATOMIC);
1337 if (!urb->sg)
1338 return -ENOMEM;
1339
1340 urb->num_sgs = num_sgs;
1341 sg_init_table(urb->sg, urb->num_sgs + 1);
1342
1343 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1344 total_len += skb_headlen(skb);
1345
1346 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1347 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1348
1349 total_len += skb_frag_size(f);
1350 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1351 f->page_offset);
1352 }
1353 urb->transfer_buffer_length = total_len;
1354
1355 return 1;
1356 }
1357
usbnet_start_xmit(struct sk_buff * skb,struct net_device * net)1358 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1359 struct net_device *net)
1360 {
1361 struct usbnet *dev = netdev_priv(net);
1362 unsigned int length;
1363 struct urb *urb = NULL;
1364 struct skb_data *entry;
1365 struct driver_info *info = dev->driver_info;
1366 unsigned long flags;
1367 int retval;
1368
1369 if (skb)
1370 skb_tx_timestamp(skb);
1371
1372 // some devices want funky USB-level framing, for
1373 // win32 driver (usually) and/or hardware quirks
1374 if (info->tx_fixup) {
1375 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1376 if (!skb) {
1377 /* packet collected; minidriver waiting for more */
1378 if (info->flags & FLAG_MULTI_PACKET)
1379 goto not_drop;
1380 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1381 goto drop;
1382 }
1383 }
1384
1385 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1386 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1387 goto drop;
1388 }
1389
1390 entry = (struct skb_data *) skb->cb;
1391 entry->urb = urb;
1392 entry->dev = dev;
1393
1394 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1395 skb->data, skb->len, tx_complete, skb);
1396 if (dev->can_dma_sg) {
1397 if (build_dma_sg(skb, urb) < 0)
1398 goto drop;
1399 }
1400 length = urb->transfer_buffer_length;
1401
1402 /* don't assume the hardware handles USB_ZERO_PACKET
1403 * NOTE: strictly conforming cdc-ether devices should expect
1404 * the ZLP here, but ignore the one-byte packet.
1405 * NOTE2: CDC NCM specification is different from CDC ECM when
1406 * handling ZLP/short packets, so cdc_ncm driver will make short
1407 * packet itself if needed.
1408 */
1409 if (length % dev->maxpacket == 0) {
1410 if (!(info->flags & FLAG_SEND_ZLP)) {
1411 if (!(info->flags & FLAG_MULTI_PACKET)) {
1412 length++;
1413 if (skb_tailroom(skb) && !urb->num_sgs) {
1414 skb->data[skb->len] = 0;
1415 __skb_put(skb, 1);
1416 } else if (urb->num_sgs)
1417 sg_set_buf(&urb->sg[urb->num_sgs++],
1418 dev->padding_pkt, 1);
1419 }
1420 } else
1421 urb->transfer_flags |= URB_ZERO_PACKET;
1422 }
1423 urb->transfer_buffer_length = length;
1424
1425 if (info->flags & FLAG_MULTI_PACKET) {
1426 /* Driver has set number of packets and a length delta.
1427 * Calculate the complete length and ensure that it's
1428 * positive.
1429 */
1430 entry->length += length;
1431 if (WARN_ON_ONCE(entry->length <= 0))
1432 entry->length = length;
1433 } else {
1434 usbnet_set_skb_tx_stats(skb, 1, length);
1435 }
1436
1437 spin_lock_irqsave(&dev->txq.lock, flags);
1438 retval = usb_autopm_get_interface_async(dev->intf);
1439 if (retval < 0) {
1440 spin_unlock_irqrestore(&dev->txq.lock, flags);
1441 goto drop;
1442 }
1443 if (netif_queue_stopped(net)) {
1444 usb_autopm_put_interface_async(dev->intf);
1445 spin_unlock_irqrestore(&dev->txq.lock, flags);
1446 goto drop;
1447 }
1448
1449 #ifdef CONFIG_PM
1450 /* if this triggers the device is still a sleep */
1451 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1452 /* transmission will be done in resume */
1453 usb_anchor_urb(urb, &dev->deferred);
1454 /* no use to process more packets */
1455 netif_stop_queue(net);
1456 usb_put_urb(urb);
1457 spin_unlock_irqrestore(&dev->txq.lock, flags);
1458 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1459 goto deferred;
1460 }
1461 #endif
1462
1463 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1464 case -EPIPE:
1465 netif_stop_queue (net);
1466 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1467 usb_autopm_put_interface_async(dev->intf);
1468 break;
1469 default:
1470 usb_autopm_put_interface_async(dev->intf);
1471 netif_dbg(dev, tx_err, dev->net,
1472 "tx: submit urb err %d\n", retval);
1473 break;
1474 case 0:
1475 netif_trans_update(net);
1476 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1477 if (dev->txq.qlen >= TX_QLEN (dev))
1478 netif_stop_queue (net);
1479 }
1480 spin_unlock_irqrestore (&dev->txq.lock, flags);
1481
1482 if (retval) {
1483 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1484 drop:
1485 dev->net->stats.tx_dropped++;
1486 not_drop:
1487 if (skb)
1488 dev_kfree_skb_any (skb);
1489 if (urb) {
1490 kfree(urb->sg);
1491 usb_free_urb(urb);
1492 }
1493 } else
1494 netif_dbg(dev, tx_queued, dev->net,
1495 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1496 #ifdef CONFIG_PM
1497 deferred:
1498 #endif
1499 return NETDEV_TX_OK;
1500 }
1501 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1502
rx_alloc_submit(struct usbnet * dev,gfp_t flags)1503 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1504 {
1505 struct urb *urb;
1506 int i;
1507 int ret = 0;
1508
1509 /* don't refill the queue all at once */
1510 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1511 urb = usb_alloc_urb(0, flags);
1512 if (urb != NULL) {
1513 ret = rx_submit(dev, urb, flags);
1514 if (ret)
1515 goto err;
1516 } else {
1517 ret = -ENOMEM;
1518 goto err;
1519 }
1520 }
1521 err:
1522 return ret;
1523 }
1524
1525 /*-------------------------------------------------------------------------*/
1526
1527 // tasklet (work deferred from completions, in_irq) or timer
1528
usbnet_bh(struct timer_list * t)1529 static void usbnet_bh (struct timer_list *t)
1530 {
1531 struct usbnet *dev = from_timer(dev, t, delay);
1532 struct sk_buff *skb;
1533 struct skb_data *entry;
1534
1535 while ((skb = skb_dequeue (&dev->done))) {
1536 entry = (struct skb_data *) skb->cb;
1537 switch (entry->state) {
1538 case rx_done:
1539 entry->state = rx_cleanup;
1540 rx_process (dev, skb);
1541 continue;
1542 case tx_done:
1543 kfree(entry->urb->sg);
1544 case rx_cleanup:
1545 usb_free_urb (entry->urb);
1546 dev_kfree_skb (skb);
1547 continue;
1548 default:
1549 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1550 }
1551 }
1552
1553 /* restart RX again after disabling due to high error rate */
1554 clear_bit(EVENT_RX_KILL, &dev->flags);
1555
1556 /* waiting for all pending urbs to complete?
1557 * only then can we forgo submitting anew
1558 */
1559 if (waitqueue_active(&dev->wait)) {
1560 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1561 wake_up_all(&dev->wait);
1562
1563 // or are we maybe short a few urbs?
1564 } else if (netif_running (dev->net) &&
1565 netif_device_present (dev->net) &&
1566 netif_carrier_ok(dev->net) &&
1567 !timer_pending(&dev->delay) &&
1568 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1569 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1570 int temp = dev->rxq.qlen;
1571
1572 if (temp < RX_QLEN(dev)) {
1573 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1574 return;
1575 if (temp != dev->rxq.qlen)
1576 netif_dbg(dev, link, dev->net,
1577 "rxqlen %d --> %d\n",
1578 temp, dev->rxq.qlen);
1579 if (dev->rxq.qlen < RX_QLEN(dev))
1580 tasklet_schedule (&dev->bh);
1581 }
1582 if (dev->txq.qlen < TX_QLEN (dev))
1583 netif_wake_queue (dev->net);
1584 }
1585 }
1586
1587
1588 /*-------------------------------------------------------------------------
1589 *
1590 * USB Device Driver support
1591 *
1592 *-------------------------------------------------------------------------*/
1593
1594 // precondition: never called in_interrupt
1595
usbnet_disconnect(struct usb_interface * intf)1596 void usbnet_disconnect (struct usb_interface *intf)
1597 {
1598 struct usbnet *dev;
1599 struct usb_device *xdev;
1600 struct net_device *net;
1601
1602 dev = usb_get_intfdata(intf);
1603 usb_set_intfdata(intf, NULL);
1604 if (!dev)
1605 return;
1606
1607 xdev = interface_to_usbdev (intf);
1608
1609 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1610 intf->dev.driver->name,
1611 xdev->bus->bus_name, xdev->devpath,
1612 dev->driver_info->description);
1613
1614 net = dev->net;
1615 unregister_netdev (net);
1616
1617 cancel_work_sync(&dev->kevent);
1618
1619 usb_scuttle_anchored_urbs(&dev->deferred);
1620
1621 if (dev->driver_info->unbind)
1622 dev->driver_info->unbind (dev, intf);
1623
1624 usb_kill_urb(dev->interrupt);
1625 usb_free_urb(dev->interrupt);
1626 kfree(dev->padding_pkt);
1627
1628 free_percpu(dev->stats64);
1629 free_netdev(net);
1630 }
1631 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1632
1633 static const struct net_device_ops usbnet_netdev_ops = {
1634 .ndo_open = usbnet_open,
1635 .ndo_stop = usbnet_stop,
1636 .ndo_start_xmit = usbnet_start_xmit,
1637 .ndo_tx_timeout = usbnet_tx_timeout,
1638 .ndo_set_rx_mode = usbnet_set_rx_mode,
1639 .ndo_change_mtu = usbnet_change_mtu,
1640 .ndo_get_stats64 = usbnet_get_stats64,
1641 .ndo_set_mac_address = eth_mac_addr,
1642 .ndo_validate_addr = eth_validate_addr,
1643 };
1644
1645 /*-------------------------------------------------------------------------*/
1646
1647 // precondition: never called in_interrupt
1648
1649 static struct device_type wlan_type = {
1650 .name = "wlan",
1651 };
1652
1653 static struct device_type wwan_type = {
1654 .name = "wwan",
1655 };
1656
1657 int
usbnet_probe(struct usb_interface * udev,const struct usb_device_id * prod)1658 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1659 {
1660 struct usbnet *dev;
1661 struct net_device *net;
1662 struct usb_host_interface *interface;
1663 struct driver_info *info;
1664 struct usb_device *xdev;
1665 int status;
1666 const char *name;
1667 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1668
1669 /* usbnet already took usb runtime pm, so have to enable the feature
1670 * for usb interface, otherwise usb_autopm_get_interface may return
1671 * failure if RUNTIME_PM is enabled.
1672 */
1673 if (!driver->supports_autosuspend) {
1674 driver->supports_autosuspend = 1;
1675 pm_runtime_enable(&udev->dev);
1676 }
1677
1678 name = udev->dev.driver->name;
1679 info = (struct driver_info *) prod->driver_info;
1680 if (!info) {
1681 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1682 return -ENODEV;
1683 }
1684 xdev = interface_to_usbdev (udev);
1685 interface = udev->cur_altsetting;
1686
1687 status = -ENOMEM;
1688
1689 // set up our own records
1690 net = alloc_etherdev(sizeof(*dev));
1691 if (!net)
1692 goto out;
1693
1694 /* netdev_printk() needs this so do it as early as possible */
1695 SET_NETDEV_DEV(net, &udev->dev);
1696
1697 dev = netdev_priv(net);
1698 dev->udev = xdev;
1699 dev->intf = udev;
1700 dev->driver_info = info;
1701 dev->driver_name = name;
1702
1703 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1704 if (!dev->stats64)
1705 goto out0;
1706
1707 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1708 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1709 init_waitqueue_head(&dev->wait);
1710 skb_queue_head_init (&dev->rxq);
1711 skb_queue_head_init (&dev->txq);
1712 skb_queue_head_init (&dev->done);
1713 skb_queue_head_init(&dev->rxq_pause);
1714 dev->bh.func = (void (*)(unsigned long))usbnet_bh;
1715 dev->bh.data = (unsigned long)&dev->delay;
1716 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1717 init_usb_anchor(&dev->deferred);
1718 timer_setup(&dev->delay, usbnet_bh, 0);
1719 mutex_init (&dev->phy_mutex);
1720 mutex_init(&dev->interrupt_mutex);
1721 dev->interrupt_count = 0;
1722
1723 dev->net = net;
1724 strcpy (net->name, "usb%d");
1725 memcpy (net->dev_addr, node_id, sizeof node_id);
1726
1727 /* rx and tx sides can use different message sizes;
1728 * bind() should set rx_urb_size in that case.
1729 */
1730 dev->hard_mtu = net->mtu + net->hard_header_len;
1731 net->min_mtu = 0;
1732 net->max_mtu = ETH_MAX_MTU;
1733
1734 net->netdev_ops = &usbnet_netdev_ops;
1735 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1736 net->ethtool_ops = &usbnet_ethtool_ops;
1737
1738 // allow device-specific bind/init procedures
1739 // NOTE net->name still not usable ...
1740 if (info->bind) {
1741 status = info->bind (dev, udev);
1742 if (status < 0)
1743 goto out1;
1744
1745 // heuristic: "usb%d" for links we know are two-host,
1746 // else "eth%d" when there's reasonable doubt. userspace
1747 // can rename the link if it knows better.
1748 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1749 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1750 (net->dev_addr [0] & 0x02) == 0))
1751 strcpy (net->name, "eth%d");
1752 /* WLAN devices should always be named "wlan%d" */
1753 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1754 strcpy(net->name, "wlan%d");
1755 /* WWAN devices should always be named "wwan%d" */
1756 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1757 strcpy(net->name, "wwan%d");
1758
1759 /* devices that cannot do ARP */
1760 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1761 net->flags |= IFF_NOARP;
1762
1763 /* maybe the remote can't receive an Ethernet MTU */
1764 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1765 net->mtu = dev->hard_mtu - net->hard_header_len;
1766 } else if (!info->in || !info->out)
1767 status = usbnet_get_endpoints (dev, udev);
1768 else {
1769 dev->in = usb_rcvbulkpipe (xdev, info->in);
1770 dev->out = usb_sndbulkpipe (xdev, info->out);
1771 if (!(info->flags & FLAG_NO_SETINT))
1772 status = usb_set_interface (xdev,
1773 interface->desc.bInterfaceNumber,
1774 interface->desc.bAlternateSetting);
1775 else
1776 status = 0;
1777
1778 }
1779 if (status >= 0 && dev->status)
1780 status = init_status (dev, udev);
1781 if (status < 0)
1782 goto out3;
1783
1784 if (!dev->rx_urb_size)
1785 dev->rx_urb_size = dev->hard_mtu;
1786 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1787
1788 /* let userspace know we have a random address */
1789 if (ether_addr_equal(net->dev_addr, node_id))
1790 net->addr_assign_type = NET_ADDR_RANDOM;
1791
1792 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1793 SET_NETDEV_DEVTYPE(net, &wlan_type);
1794 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1795 SET_NETDEV_DEVTYPE(net, &wwan_type);
1796
1797 /* initialize max rx_qlen and tx_qlen */
1798 usbnet_update_max_qlen(dev);
1799
1800 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1801 !(info->flags & FLAG_MULTI_PACKET)) {
1802 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1803 if (!dev->padding_pkt) {
1804 status = -ENOMEM;
1805 goto out4;
1806 }
1807 }
1808
1809 status = register_netdev (net);
1810 if (status)
1811 goto out5;
1812 netif_info(dev, probe, dev->net,
1813 "register '%s' at usb-%s-%s, %s, %pM\n",
1814 udev->dev.driver->name,
1815 xdev->bus->bus_name, xdev->devpath,
1816 dev->driver_info->description,
1817 net->dev_addr);
1818
1819 // ok, it's ready to go.
1820 usb_set_intfdata (udev, dev);
1821
1822 netif_device_attach (net);
1823
1824 if (dev->driver_info->flags & FLAG_LINK_INTR)
1825 usbnet_link_change(dev, 0, 0);
1826
1827 return 0;
1828
1829 out5:
1830 kfree(dev->padding_pkt);
1831 out4:
1832 usb_free_urb(dev->interrupt);
1833 out3:
1834 if (info->unbind)
1835 info->unbind (dev, udev);
1836 out1:
1837 /* subdrivers must undo all they did in bind() if they
1838 * fail it, but we may fail later and a deferred kevent
1839 * may trigger an error resubmitting itself and, worse,
1840 * schedule a timer. So we kill it all just in case.
1841 */
1842 cancel_work_sync(&dev->kevent);
1843 del_timer_sync(&dev->delay);
1844 free_percpu(dev->stats64);
1845 out0:
1846 free_netdev(net);
1847 out:
1848 return status;
1849 }
1850 EXPORT_SYMBOL_GPL(usbnet_probe);
1851
1852 /*-------------------------------------------------------------------------*/
1853
1854 /*
1855 * suspend the whole driver as soon as the first interface is suspended
1856 * resume only when the last interface is resumed
1857 */
1858
usbnet_suspend(struct usb_interface * intf,pm_message_t message)1859 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1860 {
1861 struct usbnet *dev = usb_get_intfdata(intf);
1862
1863 if (!dev->suspend_count++) {
1864 spin_lock_irq(&dev->txq.lock);
1865 /* don't autosuspend while transmitting */
1866 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1867 dev->suspend_count--;
1868 spin_unlock_irq(&dev->txq.lock);
1869 return -EBUSY;
1870 } else {
1871 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1872 spin_unlock_irq(&dev->txq.lock);
1873 }
1874 /*
1875 * accelerate emptying of the rx and queues, to avoid
1876 * having everything error out.
1877 */
1878 netif_device_detach (dev->net);
1879 usbnet_terminate_urbs(dev);
1880 __usbnet_status_stop_force(dev);
1881
1882 /*
1883 * reattach so runtime management can use and
1884 * wake the device
1885 */
1886 netif_device_attach (dev->net);
1887 }
1888 return 0;
1889 }
1890 EXPORT_SYMBOL_GPL(usbnet_suspend);
1891
usbnet_resume(struct usb_interface * intf)1892 int usbnet_resume (struct usb_interface *intf)
1893 {
1894 struct usbnet *dev = usb_get_intfdata(intf);
1895 struct sk_buff *skb;
1896 struct urb *res;
1897 int retval;
1898
1899 if (!--dev->suspend_count) {
1900 /* resume interrupt URB if it was previously submitted */
1901 __usbnet_status_start_force(dev, GFP_NOIO);
1902
1903 spin_lock_irq(&dev->txq.lock);
1904 while ((res = usb_get_from_anchor(&dev->deferred))) {
1905
1906 skb = (struct sk_buff *)res->context;
1907 retval = usb_submit_urb(res, GFP_ATOMIC);
1908 if (retval < 0) {
1909 dev_kfree_skb_any(skb);
1910 kfree(res->sg);
1911 usb_free_urb(res);
1912 usb_autopm_put_interface_async(dev->intf);
1913 } else {
1914 netif_trans_update(dev->net);
1915 __skb_queue_tail(&dev->txq, skb);
1916 }
1917 }
1918
1919 smp_mb();
1920 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1921 spin_unlock_irq(&dev->txq.lock);
1922
1923 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1924 /* handle remote wakeup ASAP
1925 * we cannot race against stop
1926 */
1927 if (netif_device_present(dev->net) &&
1928 !timer_pending(&dev->delay) &&
1929 !test_bit(EVENT_RX_HALT, &dev->flags))
1930 rx_alloc_submit(dev, GFP_NOIO);
1931
1932 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1933 netif_tx_wake_all_queues(dev->net);
1934 tasklet_schedule (&dev->bh);
1935 }
1936 }
1937
1938 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1939 usb_autopm_get_interface_no_resume(intf);
1940
1941 return 0;
1942 }
1943 EXPORT_SYMBOL_GPL(usbnet_resume);
1944
1945 /*
1946 * Either a subdriver implements manage_power, then it is assumed to always
1947 * be ready to be suspended or it reports the readiness to be suspended
1948 * explicitly
1949 */
usbnet_device_suggests_idle(struct usbnet * dev)1950 void usbnet_device_suggests_idle(struct usbnet *dev)
1951 {
1952 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1953 dev->intf->needs_remote_wakeup = 1;
1954 usb_autopm_put_interface_async(dev->intf);
1955 }
1956 }
1957 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1958
1959 /*
1960 * For devices that can do without special commands
1961 */
usbnet_manage_power(struct usbnet * dev,int on)1962 int usbnet_manage_power(struct usbnet *dev, int on)
1963 {
1964 dev->intf->needs_remote_wakeup = on;
1965 return 0;
1966 }
1967 EXPORT_SYMBOL(usbnet_manage_power);
1968
usbnet_link_change(struct usbnet * dev,bool link,bool need_reset)1969 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1970 {
1971 /* update link after link is reseted */
1972 if (link && !need_reset)
1973 netif_carrier_on(dev->net);
1974 else
1975 netif_carrier_off(dev->net);
1976
1977 if (need_reset && link)
1978 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1979 else
1980 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1981 }
1982 EXPORT_SYMBOL(usbnet_link_change);
1983
1984 /*-------------------------------------------------------------------------*/
__usbnet_read_cmd(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,void * data,u16 size)1985 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1986 u16 value, u16 index, void *data, u16 size)
1987 {
1988 void *buf = NULL;
1989 int err = -ENOMEM;
1990
1991 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1992 " value=0x%04x index=0x%04x size=%d\n",
1993 cmd, reqtype, value, index, size);
1994
1995 if (size) {
1996 buf = kmalloc(size, GFP_KERNEL);
1997 if (!buf)
1998 goto out;
1999 }
2000
2001 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
2002 cmd, reqtype, value, index, buf, size,
2003 USB_CTRL_GET_TIMEOUT);
2004 if (err > 0 && err <= size) {
2005 if (data)
2006 memcpy(data, buf, err);
2007 else
2008 netdev_dbg(dev->net,
2009 "Huh? Data requested but thrown away.\n");
2010 }
2011 kfree(buf);
2012 out:
2013 return err;
2014 }
2015
__usbnet_write_cmd(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,const void * data,u16 size)2016 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2017 u16 value, u16 index, const void *data,
2018 u16 size)
2019 {
2020 void *buf = NULL;
2021 int err = -ENOMEM;
2022
2023 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2024 " value=0x%04x index=0x%04x size=%d\n",
2025 cmd, reqtype, value, index, size);
2026
2027 if (data) {
2028 buf = kmemdup(data, size, GFP_KERNEL);
2029 if (!buf)
2030 goto out;
2031 } else {
2032 if (size) {
2033 WARN_ON_ONCE(1);
2034 err = -EINVAL;
2035 goto out;
2036 }
2037 }
2038
2039 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2040 cmd, reqtype, value, index, buf, size,
2041 USB_CTRL_SET_TIMEOUT);
2042 kfree(buf);
2043
2044 out:
2045 return err;
2046 }
2047
2048 /*
2049 * The function can't be called inside suspend/resume callback,
2050 * otherwise deadlock will be caused.
2051 */
usbnet_read_cmd(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,void * data,u16 size)2052 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2053 u16 value, u16 index, void *data, u16 size)
2054 {
2055 int ret;
2056
2057 if (usb_autopm_get_interface(dev->intf) < 0)
2058 return -ENODEV;
2059 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2060 data, size);
2061 usb_autopm_put_interface(dev->intf);
2062 return ret;
2063 }
2064 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2065
2066 /*
2067 * The function can't be called inside suspend/resume callback,
2068 * otherwise deadlock will be caused.
2069 */
usbnet_write_cmd(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,const void * data,u16 size)2070 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2071 u16 value, u16 index, const void *data, u16 size)
2072 {
2073 int ret;
2074
2075 if (usb_autopm_get_interface(dev->intf) < 0)
2076 return -ENODEV;
2077 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2078 data, size);
2079 usb_autopm_put_interface(dev->intf);
2080 return ret;
2081 }
2082 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2083
2084 /*
2085 * The function can be called inside suspend/resume callback safely
2086 * and should only be called by suspend/resume callback generally.
2087 */
usbnet_read_cmd_nopm(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,void * data,u16 size)2088 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2089 u16 value, u16 index, void *data, u16 size)
2090 {
2091 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2092 data, size);
2093 }
2094 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2095
2096 /*
2097 * The function can be called inside suspend/resume callback safely
2098 * and should only be called by suspend/resume callback generally.
2099 */
usbnet_write_cmd_nopm(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,const void * data,u16 size)2100 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2101 u16 value, u16 index, const void *data,
2102 u16 size)
2103 {
2104 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2105 data, size);
2106 }
2107 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2108
usbnet_async_cmd_cb(struct urb * urb)2109 static void usbnet_async_cmd_cb(struct urb *urb)
2110 {
2111 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2112 int status = urb->status;
2113
2114 if (status < 0)
2115 dev_dbg(&urb->dev->dev, "%s failed with %d",
2116 __func__, status);
2117
2118 kfree(req);
2119 usb_free_urb(urb);
2120 }
2121
2122 /*
2123 * The caller must make sure that device can't be put into suspend
2124 * state until the control URB completes.
2125 */
usbnet_write_cmd_async(struct usbnet * dev,u8 cmd,u8 reqtype,u16 value,u16 index,const void * data,u16 size)2126 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2127 u16 value, u16 index, const void *data, u16 size)
2128 {
2129 struct usb_ctrlrequest *req = NULL;
2130 struct urb *urb;
2131 int err = -ENOMEM;
2132 void *buf = NULL;
2133
2134 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2135 " value=0x%04x index=0x%04x size=%d\n",
2136 cmd, reqtype, value, index, size);
2137
2138 urb = usb_alloc_urb(0, GFP_ATOMIC);
2139 if (!urb)
2140 goto fail;
2141
2142 if (data) {
2143 buf = kmemdup(data, size, GFP_ATOMIC);
2144 if (!buf) {
2145 netdev_err(dev->net, "Error allocating buffer"
2146 " in %s!\n", __func__);
2147 goto fail_free;
2148 }
2149 }
2150
2151 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2152 if (!req)
2153 goto fail_free_buf;
2154
2155 req->bRequestType = reqtype;
2156 req->bRequest = cmd;
2157 req->wValue = cpu_to_le16(value);
2158 req->wIndex = cpu_to_le16(index);
2159 req->wLength = cpu_to_le16(size);
2160
2161 usb_fill_control_urb(urb, dev->udev,
2162 usb_sndctrlpipe(dev->udev, 0),
2163 (void *)req, buf, size,
2164 usbnet_async_cmd_cb, req);
2165 urb->transfer_flags |= URB_FREE_BUFFER;
2166
2167 err = usb_submit_urb(urb, GFP_ATOMIC);
2168 if (err < 0) {
2169 netdev_err(dev->net, "Error submitting the control"
2170 " message: status=%d\n", err);
2171 goto fail_free;
2172 }
2173 return 0;
2174
2175 fail_free_buf:
2176 kfree(buf);
2177 fail_free:
2178 kfree(req);
2179 usb_free_urb(urb);
2180 fail:
2181 return err;
2182
2183 }
2184 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2185 /*-------------------------------------------------------------------------*/
2186
usbnet_init(void)2187 static int __init usbnet_init(void)
2188 {
2189 /* Compiler should optimize this out. */
2190 BUILD_BUG_ON(
2191 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2192
2193 eth_random_addr(node_id);
2194 return 0;
2195 }
2196 module_init(usbnet_init);
2197
usbnet_exit(void)2198 static void __exit usbnet_exit(void)
2199 {
2200 }
2201 module_exit(usbnet_exit);
2202
2203 MODULE_AUTHOR("David Brownell");
2204 MODULE_DESCRIPTION("USB network driver framework");
2205 MODULE_LICENSE("GPL");
2206